ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/tools/objtool/.gitignore b/marvell/linux/tools/objtool/.gitignore
new file mode 100644
index 0000000..914cff1
--- /dev/null
+++ b/marvell/linux/tools/objtool/.gitignore
@@ -0,0 +1,3 @@
+arch/x86/lib/inat-tables.c
+objtool
+fixdep
diff --git a/marvell/linux/tools/objtool/Build b/marvell/linux/tools/objtool/Build
new file mode 100644
index 0000000..8dc4f08
--- /dev/null
+++ b/marvell/linux/tools/objtool/Build
@@ -0,0 +1,27 @@
+objtool-y += arch/$(SRCARCH)/
+objtool-y += builtin-check.o
+objtool-y += builtin-orc.o
+objtool-y += check.o
+objtool-y += orc_gen.o
+objtool-y += orc_dump.o
+objtool-y += elf.o
+objtool-y += special.o
+objtool-y += objtool.o
+
+objtool-y += libstring.o
+objtool-y += libctype.o
+objtool-y += str_error_r.o
+
+CFLAGS += -I$(srctree)/tools/lib
+
+$(OUTPUT)libstring.o: ../lib/string.c FORCE
+ $(call rule_mkdir)
+ $(call if_changed_dep,cc_o_c)
+
+$(OUTPUT)libctype.o: ../lib/ctype.c FORCE
+ $(call rule_mkdir)
+ $(call if_changed_dep,cc_o_c)
+
+$(OUTPUT)str_error_r.o: ../lib/str_error_r.c FORCE
+ $(call rule_mkdir)
+ $(call if_changed_dep,cc_o_c)
diff --git a/marvell/linux/tools/objtool/Documentation/stack-validation.txt b/marvell/linux/tools/objtool/Documentation/stack-validation.txt
new file mode 100644
index 0000000..ee26bb3
--- /dev/null
+++ b/marvell/linux/tools/objtool/Documentation/stack-validation.txt
@@ -0,0 +1,325 @@
+Compile-time stack metadata validation
+======================================
+
+
+Overview
+--------
+
+The kernel CONFIG_STACK_VALIDATION option enables a host tool named
+objtool which runs at compile time. It has a "check" subcommand which
+analyzes every .o file and ensures the validity of its stack metadata.
+It enforces a set of rules on asm code and C inline assembly code so
+that stack traces can be reliable.
+
+For each function, it recursively follows all possible code paths and
+validates the correct frame pointer state at each instruction.
+
+It also follows code paths involving special sections, like
+.altinstructions, __jump_table, and __ex_table, which can add
+alternative execution paths to a given instruction (or set of
+instructions). Similarly, it knows how to follow switch statements, for
+which gcc sometimes uses jump tables.
+
+(Objtool also has an 'orc generate' subcommand which generates debuginfo
+for the ORC unwinder. See Documentation/x86/orc-unwinder.rst in the
+kernel tree for more details.)
+
+
+Why do we need stack metadata validation?
+-----------------------------------------
+
+Here are some of the benefits of validating stack metadata:
+
+a) More reliable stack traces for frame pointer enabled kernels
+
+ Frame pointers are used for debugging purposes. They allow runtime
+ code and debug tools to be able to walk the stack to determine the
+ chain of function call sites that led to the currently executing
+ code.
+
+ For some architectures, frame pointers are enabled by
+ CONFIG_FRAME_POINTER. For some other architectures they may be
+ required by the ABI (sometimes referred to as "backchain pointers").
+
+ For C code, gcc automatically generates instructions for setting up
+ frame pointers when the -fno-omit-frame-pointer option is used.
+
+ But for asm code, the frame setup instructions have to be written by
+ hand, which most people don't do. So the end result is that
+ CONFIG_FRAME_POINTER is honored for C code but not for most asm code.
+
+ For stack traces based on frame pointers to be reliable, all
+ functions which call other functions must first create a stack frame
+ and update the frame pointer. If a first function doesn't properly
+ create a stack frame before calling a second function, the *caller*
+ of the first function will be skipped on the stack trace.
+
+ For example, consider the following example backtrace with frame
+ pointers enabled:
+
+ [<ffffffff81812584>] dump_stack+0x4b/0x63
+ [<ffffffff812d6dc2>] cmdline_proc_show+0x12/0x30
+ [<ffffffff8127f568>] seq_read+0x108/0x3e0
+ [<ffffffff812cce62>] proc_reg_read+0x42/0x70
+ [<ffffffff81256197>] __vfs_read+0x37/0x100
+ [<ffffffff81256b16>] vfs_read+0x86/0x130
+ [<ffffffff81257898>] SyS_read+0x58/0xd0
+ [<ffffffff8181c1f2>] entry_SYSCALL_64_fastpath+0x12/0x76
+
+ It correctly shows that the caller of cmdline_proc_show() is
+ seq_read().
+
+ If we remove the frame pointer logic from cmdline_proc_show() by
+ replacing the frame pointer related instructions with nops, here's
+ what it looks like instead:
+
+ [<ffffffff81812584>] dump_stack+0x4b/0x63
+ [<ffffffff812d6dc2>] cmdline_proc_show+0x12/0x30
+ [<ffffffff812cce62>] proc_reg_read+0x42/0x70
+ [<ffffffff81256197>] __vfs_read+0x37/0x100
+ [<ffffffff81256b16>] vfs_read+0x86/0x130
+ [<ffffffff81257898>] SyS_read+0x58/0xd0
+ [<ffffffff8181c1f2>] entry_SYSCALL_64_fastpath+0x12/0x76
+
+ Notice that cmdline_proc_show()'s caller, seq_read(), has been
+ skipped. Instead the stack trace seems to show that
+ cmdline_proc_show() was called by proc_reg_read().
+
+ The benefit of objtool here is that because it ensures that *all*
+ functions honor CONFIG_FRAME_POINTER, no functions will ever[*] be
+ skipped on a stack trace.
+
+ [*] unless an interrupt or exception has occurred at the very
+ beginning of a function before the stack frame has been created,
+ or at the very end of the function after the stack frame has been
+ destroyed. This is an inherent limitation of frame pointers.
+
+b) ORC (Oops Rewind Capability) unwind table generation
+
+ An alternative to frame pointers and DWARF, ORC unwind data can be
+ used to walk the stack. Unlike frame pointers, ORC data is out of
+ band. So it doesn't affect runtime performance and it can be
+ reliable even when interrupts or exceptions are involved.
+
+ For more details, see Documentation/x86/orc-unwinder.rst.
+
+c) Higher live patching compatibility rate
+
+ Livepatch has an optional "consistency model", which is needed for
+ more complex patches. In order for the consistency model to work,
+ stack traces need to be reliable (or an unreliable condition needs to
+ be detectable). Objtool makes that possible.
+
+ For more details, see the livepatch documentation in the Linux kernel
+ source tree at Documentation/livepatch/livepatch.rst.
+
+Rules
+-----
+
+To achieve the validation, objtool enforces the following rules:
+
+1. Each callable function must be annotated as such with the ELF
+ function type. In asm code, this is typically done using the
+ ENTRY/ENDPROC macros. If objtool finds a return instruction
+ outside of a function, it flags an error since that usually indicates
+ callable code which should be annotated accordingly.
+
+ This rule is needed so that objtool can properly identify each
+ callable function in order to analyze its stack metadata.
+
+2. Conversely, each section of code which is *not* callable should *not*
+ be annotated as an ELF function. The ENDPROC macro shouldn't be used
+ in this case.
+
+ This rule is needed so that objtool can ignore non-callable code.
+ Such code doesn't have to follow any of the other rules.
+
+3. Each callable function which calls another function must have the
+ correct frame pointer logic, if required by CONFIG_FRAME_POINTER or
+ the architecture's back chain rules. This can by done in asm code
+ with the FRAME_BEGIN/FRAME_END macros.
+
+ This rule ensures that frame pointer based stack traces will work as
+ designed. If function A doesn't create a stack frame before calling
+ function B, the _caller_ of function A will be skipped on the stack
+ trace.
+
+4. Dynamic jumps and jumps to undefined symbols are only allowed if:
+
+ a) the jump is part of a switch statement; or
+
+ b) the jump matches sibling call semantics and the frame pointer has
+ the same value it had on function entry.
+
+ This rule is needed so that objtool can reliably analyze all of a
+ function's code paths. If a function jumps to code in another file,
+ and it's not a sibling call, objtool has no way to follow the jump
+ because it only analyzes a single file at a time.
+
+5. A callable function may not execute kernel entry/exit instructions.
+ The only code which needs such instructions is kernel entry code,
+ which shouldn't be be in callable functions anyway.
+
+ This rule is just a sanity check to ensure that callable functions
+ return normally.
+
+
+Objtool warnings
+----------------
+
+For asm files, if you're getting an error which doesn't make sense,
+first make sure that the affected code follows the above rules.
+
+For C files, the common culprits are inline asm statements and calls to
+"noreturn" functions. See below for more details.
+
+Another possible cause for errors in C code is if the Makefile removes
+-fno-omit-frame-pointer or adds -fomit-frame-pointer to the gcc options.
+
+Here are some examples of common warnings reported by objtool, what
+they mean, and suggestions for how to fix them.
+
+
+1. file.o: warning: objtool: func()+0x128: call without frame pointer save/setup
+
+ The func() function made a function call without first saving and/or
+ updating the frame pointer, and CONFIG_FRAME_POINTER is enabled.
+
+ If the error is for an asm file, and func() is indeed a callable
+ function, add proper frame pointer logic using the FRAME_BEGIN and
+ FRAME_END macros. Otherwise, if it's not a callable function, remove
+ its ELF function annotation by changing ENDPROC to END, and instead
+ use the manual unwind hint macros in asm/unwind_hints.h.
+
+ If it's a GCC-compiled .c file, the error may be because the function
+ uses an inline asm() statement which has a "call" instruction. An
+ asm() statement with a call instruction must declare the use of the
+ stack pointer in its output operand. On x86_64, this means adding
+ the ASM_CALL_CONSTRAINT as an output constraint:
+
+ asm volatile("call func" : ASM_CALL_CONSTRAINT);
+
+ Otherwise the stack frame may not get created before the call.
+
+
+2. file.o: warning: objtool: .text+0x53: unreachable instruction
+
+ Objtool couldn't find a code path to reach the instruction.
+
+ If the error is for an asm file, and the instruction is inside (or
+ reachable from) a callable function, the function should be annotated
+ with the ENTRY/ENDPROC macros (ENDPROC is the important one).
+ Otherwise, the code should probably be annotated with the unwind hint
+ macros in asm/unwind_hints.h so objtool and the unwinder can know the
+ stack state associated with the code.
+
+ If you're 100% sure the code won't affect stack traces, or if you're
+ a just a bad person, you can tell objtool to ignore it. See the
+ "Adding exceptions" section below.
+
+ If it's not actually in a callable function (e.g. kernel entry code),
+ change ENDPROC to END.
+
+
+4. file.o: warning: objtool: func(): can't find starting instruction
+ or
+ file.o: warning: objtool: func()+0x11dd: can't decode instruction
+
+ Does the file have data in a text section? If so, that can confuse
+ objtool's instruction decoder. Move the data to a more appropriate
+ section like .data or .rodata.
+
+
+5. file.o: warning: objtool: func()+0x6: unsupported instruction in callable function
+
+ This is a kernel entry/exit instruction like sysenter or iret. Such
+ instructions aren't allowed in a callable function, and are most
+ likely part of the kernel entry code. They should usually not have
+ the callable function annotation (ENDPROC) and should always be
+ annotated with the unwind hint macros in asm/unwind_hints.h.
+
+
+6. file.o: warning: objtool: func()+0x26: sibling call from callable instruction with modified stack frame
+
+ This is a dynamic jump or a jump to an undefined symbol. Objtool
+ assumed it's a sibling call and detected that the frame pointer
+ wasn't first restored to its original state.
+
+ If it's not really a sibling call, you may need to move the
+ destination code to the local file.
+
+ If the instruction is not actually in a callable function (e.g.
+ kernel entry code), change ENDPROC to END and annotate manually with
+ the unwind hint macros in asm/unwind_hints.h.
+
+
+7. file: warning: objtool: func()+0x5c: stack state mismatch
+
+ The instruction's frame pointer state is inconsistent, depending on
+ which execution path was taken to reach the instruction.
+
+ Make sure that, when CONFIG_FRAME_POINTER is enabled, the function
+ pushes and sets up the frame pointer (for x86_64, this means rbp) at
+ the beginning of the function and pops it at the end of the function.
+ Also make sure that no other code in the function touches the frame
+ pointer.
+
+ Another possibility is that the code has some asm or inline asm which
+ does some unusual things to the stack or the frame pointer. In such
+ cases it's probably appropriate to use the unwind hint macros in
+ asm/unwind_hints.h.
+
+
+8. file.o: warning: objtool: funcA() falls through to next function funcB()
+
+ This means that funcA() doesn't end with a return instruction or an
+ unconditional jump, and that objtool has determined that the function
+ can fall through into the next function. There could be different
+ reasons for this:
+
+ 1) funcA()'s last instruction is a call to a "noreturn" function like
+ panic(). In this case the noreturn function needs to be added to
+ objtool's hard-coded global_noreturns array. Feel free to bug the
+ objtool maintainer, or you can submit a patch.
+
+ 2) funcA() uses the unreachable() annotation in a section of code
+ that is actually reachable.
+
+ 3) If funcA() calls an inline function, the object code for funcA()
+ might be corrupt due to a gcc bug. For more details, see:
+ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70646
+
+
+11. file.o: warning: unannotated intra-function call
+
+ This warning means that a direct call is done to a destination which
+ is not at the beginning of a function. If this is a legit call, you
+ can remove this warning by putting the ANNOTATE_INTRA_FUNCTION_CALL
+ directive right before the call.
+
+
+If the error doesn't seem to make sense, it could be a bug in objtool.
+Feel free to ask the objtool maintainer for help.
+
+
+Adding exceptions
+-----------------
+
+If you _really_ need objtool to ignore something, and are 100% sure
+that it won't affect kernel stack traces, you can tell objtool to
+ignore it:
+
+- To skip validation of a function, use the STACK_FRAME_NON_STANDARD
+ macro.
+
+- To skip validation of a file, add
+
+ OBJECT_FILES_NON_STANDARD_filename.o := y
+
+ to the Makefile.
+
+- To skip validation of a directory, add
+
+ OBJECT_FILES_NON_STANDARD := y
+
+ to the Makefile.
diff --git a/marvell/linux/tools/objtool/Makefile b/marvell/linux/tools/objtool/Makefile
new file mode 100644
index 0000000..9ae4a10
--- /dev/null
+++ b/marvell/linux/tools/objtool/Makefile
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: GPL-2.0
+include ../scripts/Makefile.include
+include ../scripts/Makefile.arch
+
+# always use the host compiler
+AR = $(HOSTAR)
+CC = $(HOSTCC)
+LD = $(HOSTLD)
+
+ifeq ($(srctree),)
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+endif
+
+SUBCMD_SRCDIR = $(srctree)/tools/lib/subcmd/
+LIBSUBCMD_OUTPUT = $(if $(OUTPUT),$(OUTPUT),$(CURDIR)/)
+LIBSUBCMD = $(LIBSUBCMD_OUTPUT)libsubcmd.a
+
+OBJTOOL := $(OUTPUT)objtool
+OBJTOOL_IN := $(OBJTOOL)-in.o
+
+LIBELF_FLAGS := $(shell pkg-config libelf --cflags 2>/dev/null)
+LIBELF_LIBS := $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
+
+all: $(OBJTOOL)
+
+INCLUDES := -I$(srctree)/tools/include \
+ -I$(srctree)/tools/arch/$(HOSTARCH)/include/uapi \
+ -I$(srctree)/tools/arch/$(SRCARCH)/include
+WARNINGS := $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -Wno-packed
+CFLAGS := -Werror $(WARNINGS) $(KBUILD_HOSTCFLAGS) -g $(INCLUDES) $(LIBELF_FLAGS)
+LDFLAGS += $(LIBELF_LIBS) $(LIBSUBCMD) $(KBUILD_HOSTLDFLAGS)
+
+# Allow old libelf to be used:
+elfshdr := $(shell echo '$(pound)include <libelf.h>' | $(CC) $(CFLAGS) -x c -E - | grep elf_getshdr)
+CFLAGS += $(if $(elfshdr),,-DLIBELF_USE_DEPRECATED)
+
+AWK = awk
+export srctree OUTPUT CFLAGS SRCARCH AWK
+include $(srctree)/tools/build/Makefile.include
+
+$(OBJTOOL_IN): fixdep FORCE
+ @$(MAKE) $(build)=objtool
+
+$(OBJTOOL): $(LIBSUBCMD) $(OBJTOOL_IN)
+ @$(CONFIG_SHELL) ./sync-check.sh
+ $(QUIET_LINK)$(CC) $(OBJTOOL_IN) $(LDFLAGS) -o $@
+
+
+$(LIBSUBCMD): fixdep FORCE
+ $(Q)$(MAKE) -C $(SUBCMD_SRCDIR) OUTPUT=$(LIBSUBCMD_OUTPUT)
+
+clean:
+ $(call QUIET_CLEAN, objtool) $(RM) $(OBJTOOL)
+ $(Q)find $(OUTPUT) -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
+ $(Q)$(RM) $(OUTPUT)arch/x86/inat-tables.c $(OUTPUT)fixdep
+
+FORCE:
+
+.PHONY: clean FORCE
diff --git a/marvell/linux/tools/objtool/arch.h b/marvell/linux/tools/objtool/arch.h
new file mode 100644
index 0000000..ced3765
--- /dev/null
+++ b/marvell/linux/tools/objtool/arch.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+#ifndef _ARCH_H
+#define _ARCH_H
+
+#include <stdbool.h>
+#include <linux/list.h>
+#include "elf.h"
+#include "cfi.h"
+
+enum insn_type {
+ INSN_JUMP_CONDITIONAL,
+ INSN_JUMP_UNCONDITIONAL,
+ INSN_JUMP_DYNAMIC,
+ INSN_JUMP_DYNAMIC_CONDITIONAL,
+ INSN_CALL,
+ INSN_CALL_DYNAMIC,
+ INSN_RETURN,
+ INSN_CONTEXT_SWITCH,
+ INSN_STACK,
+ INSN_BUG,
+ INSN_NOP,
+ INSN_STAC,
+ INSN_CLAC,
+ INSN_STD,
+ INSN_CLD,
+ INSN_OTHER,
+};
+
+enum op_dest_type {
+ OP_DEST_REG,
+ OP_DEST_REG_INDIRECT,
+ OP_DEST_MEM,
+ OP_DEST_PUSH,
+ OP_DEST_PUSHF,
+ OP_DEST_LEAVE,
+};
+
+struct op_dest {
+ enum op_dest_type type;
+ unsigned char reg;
+ int offset;
+};
+
+enum op_src_type {
+ OP_SRC_REG,
+ OP_SRC_REG_INDIRECT,
+ OP_SRC_CONST,
+ OP_SRC_POP,
+ OP_SRC_POPF,
+ OP_SRC_ADD,
+ OP_SRC_AND,
+};
+
+struct op_src {
+ enum op_src_type type;
+ unsigned char reg;
+ int offset;
+};
+
+struct stack_op {
+ struct op_dest dest;
+ struct op_src src;
+};
+
+void arch_initial_func_cfi_state(struct cfi_state *state);
+
+int arch_decode_instruction(struct elf *elf, struct section *sec,
+ unsigned long offset, unsigned int maxlen,
+ unsigned int *len, enum insn_type *type,
+ unsigned long *immediate, struct stack_op *op);
+
+bool arch_callee_saved_reg(unsigned char reg);
+
+#endif /* _ARCH_H */
diff --git a/marvell/linux/tools/objtool/arch/x86/Build b/marvell/linux/tools/objtool/arch/x86/Build
new file mode 100644
index 0000000..7c50040
--- /dev/null
+++ b/marvell/linux/tools/objtool/arch/x86/Build
@@ -0,0 +1,12 @@
+objtool-y += decode.o
+
+inat_tables_script = ../arch/x86/tools/gen-insn-attr-x86.awk
+inat_tables_maps = ../arch/x86/lib/x86-opcode-map.txt
+
+$(OUTPUT)arch/x86/lib/inat-tables.c: $(inat_tables_script) $(inat_tables_maps)
+ $(call rule_mkdir)
+ $(Q)$(call echo-cmd,gen)$(AWK) -f $(inat_tables_script) $(inat_tables_maps) > $@
+
+$(OUTPUT)arch/x86/decode.o: $(OUTPUT)arch/x86/lib/inat-tables.c
+
+CFLAGS_decode.o += -I$(OUTPUT)arch/x86/lib
diff --git a/marvell/linux/tools/objtool/arch/x86/decode.c b/marvell/linux/tools/objtool/arch/x86/decode.c
new file mode 100644
index 0000000..c3ff62c
--- /dev/null
+++ b/marvell/linux/tools/objtool/arch/x86/decode.c
@@ -0,0 +1,505 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define unlikely(cond) (cond)
+#include <asm/insn.h>
+#include "../../../arch/x86/lib/inat.c"
+#include "../../../arch/x86/lib/insn.c"
+
+#include "../../elf.h"
+#include "../../arch.h"
+#include "../../warn.h"
+
+static unsigned char op_to_cfi_reg[][2] = {
+ {CFI_AX, CFI_R8},
+ {CFI_CX, CFI_R9},
+ {CFI_DX, CFI_R10},
+ {CFI_BX, CFI_R11},
+ {CFI_SP, CFI_R12},
+ {CFI_BP, CFI_R13},
+ {CFI_SI, CFI_R14},
+ {CFI_DI, CFI_R15},
+};
+
+static int is_x86_64(struct elf *elf)
+{
+ switch (elf->ehdr.e_machine) {
+ case EM_X86_64:
+ return 1;
+ case EM_386:
+ return 0;
+ default:
+ WARN("unexpected ELF machine type %d", elf->ehdr.e_machine);
+ return -1;
+ }
+}
+
+bool arch_callee_saved_reg(unsigned char reg)
+{
+ switch (reg) {
+ case CFI_BP:
+ case CFI_BX:
+ case CFI_R12:
+ case CFI_R13:
+ case CFI_R14:
+ case CFI_R15:
+ return true;
+
+ case CFI_AX:
+ case CFI_CX:
+ case CFI_DX:
+ case CFI_SI:
+ case CFI_DI:
+ case CFI_SP:
+ case CFI_R8:
+ case CFI_R9:
+ case CFI_R10:
+ case CFI_R11:
+ case CFI_RA:
+ default:
+ return false;
+ }
+}
+
+int arch_decode_instruction(struct elf *elf, struct section *sec,
+ unsigned long offset, unsigned int maxlen,
+ unsigned int *len, enum insn_type *type,
+ unsigned long *immediate, struct stack_op *op)
+{
+ struct insn insn;
+ int x86_64, sign;
+ unsigned char op1, op2, rex = 0, rex_b = 0, rex_r = 0, rex_w = 0,
+ rex_x = 0, modrm = 0, modrm_mod = 0, modrm_rm = 0,
+ modrm_reg = 0, sib = 0;
+
+ x86_64 = is_x86_64(elf);
+ if (x86_64 == -1)
+ return -1;
+
+ insn_init(&insn, sec->data->d_buf + offset, maxlen, x86_64);
+ insn_get_length(&insn);
+
+ if (!insn_complete(&insn)) {
+ WARN_FUNC("can't decode instruction", sec, offset);
+ return -1;
+ }
+
+ *len = insn.length;
+ *type = INSN_OTHER;
+
+ if (insn.vex_prefix.nbytes)
+ return 0;
+
+ op1 = insn.opcode.bytes[0];
+ op2 = insn.opcode.bytes[1];
+
+ if (insn.rex_prefix.nbytes) {
+ rex = insn.rex_prefix.bytes[0];
+ rex_w = X86_REX_W(rex) >> 3;
+ rex_r = X86_REX_R(rex) >> 2;
+ rex_x = X86_REX_X(rex) >> 1;
+ rex_b = X86_REX_B(rex);
+ }
+
+ if (insn.modrm.nbytes) {
+ modrm = insn.modrm.bytes[0];
+ modrm_mod = X86_MODRM_MOD(modrm);
+ modrm_reg = X86_MODRM_REG(modrm);
+ modrm_rm = X86_MODRM_RM(modrm);
+ }
+
+ if (insn.sib.nbytes)
+ sib = insn.sib.bytes[0];
+
+ switch (op1) {
+
+ case 0x1:
+ case 0x29:
+ if (rex_w && !rex_b && modrm_mod == 3 && modrm_rm == 4) {
+
+ /* add/sub reg, %rsp */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_ADD;
+ op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = CFI_SP;
+ }
+ break;
+
+ case 0x50 ... 0x57:
+
+ /* push reg */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_REG;
+ op->src.reg = op_to_cfi_reg[op1 & 0x7][rex_b];
+ op->dest.type = OP_DEST_PUSH;
+
+ break;
+
+ case 0x58 ... 0x5f:
+
+ /* pop reg */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_POP;
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = op_to_cfi_reg[op1 & 0x7][rex_b];
+
+ break;
+
+ case 0x68:
+ case 0x6a:
+ /* push immediate */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_CONST;
+ op->dest.type = OP_DEST_PUSH;
+ break;
+
+ case 0x70 ... 0x7f:
+ *type = INSN_JUMP_CONDITIONAL;
+ break;
+
+ case 0x81:
+ case 0x83:
+ if (rex != 0x48)
+ break;
+
+ if (modrm == 0xe4) {
+ /* and imm, %rsp */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_AND;
+ op->src.reg = CFI_SP;
+ op->src.offset = insn.immediate.value;
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = CFI_SP;
+ break;
+ }
+
+ if (modrm == 0xc4)
+ sign = 1;
+ else if (modrm == 0xec)
+ sign = -1;
+ else
+ break;
+
+ /* add/sub imm, %rsp */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_ADD;
+ op->src.reg = CFI_SP;
+ op->src.offset = insn.immediate.value * sign;
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = CFI_SP;
+ break;
+
+ case 0x89:
+ if (rex_w && !rex_r && modrm_mod == 3 && modrm_reg == 4) {
+
+ /* mov %rsp, reg */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_REG;
+ op->src.reg = CFI_SP;
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = op_to_cfi_reg[modrm_rm][rex_b];
+ break;
+ }
+
+ if (rex_w && !rex_b && modrm_mod == 3 && modrm_rm == 4) {
+
+ /* mov reg, %rsp */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_REG;
+ op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = CFI_SP;
+ break;
+ }
+
+ /* fallthrough */
+ case 0x88:
+ if (!rex_b &&
+ (modrm_mod == 1 || modrm_mod == 2) && modrm_rm == 5) {
+
+ /* mov reg, disp(%rbp) */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_REG;
+ op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
+ op->dest.type = OP_DEST_REG_INDIRECT;
+ op->dest.reg = CFI_BP;
+ op->dest.offset = insn.displacement.value;
+
+ } else if (rex_w && !rex_b && modrm_rm == 4 && sib == 0x24) {
+
+ /* mov reg, disp(%rsp) */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_REG;
+ op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
+ op->dest.type = OP_DEST_REG_INDIRECT;
+ op->dest.reg = CFI_SP;
+ op->dest.offset = insn.displacement.value;
+ }
+
+ break;
+
+ case 0x8b:
+ if (rex_w && !rex_b && modrm_mod == 1 && modrm_rm == 5) {
+
+ /* mov disp(%rbp), reg */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_REG_INDIRECT;
+ op->src.reg = CFI_BP;
+ op->src.offset = insn.displacement.value;
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = op_to_cfi_reg[modrm_reg][rex_r];
+
+ } else if (rex_w && !rex_b && sib == 0x24 &&
+ modrm_mod != 3 && modrm_rm == 4) {
+
+ /* mov disp(%rsp), reg */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_REG_INDIRECT;
+ op->src.reg = CFI_SP;
+ op->src.offset = insn.displacement.value;
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = op_to_cfi_reg[modrm_reg][rex_r];
+ }
+
+ break;
+
+ case 0x8d:
+ if (sib == 0x24 && rex_w && !rex_b && !rex_x) {
+
+ *type = INSN_STACK;
+ if (!insn.displacement.value) {
+ /* lea (%rsp), reg */
+ op->src.type = OP_SRC_REG;
+ } else {
+ /* lea disp(%rsp), reg */
+ op->src.type = OP_SRC_ADD;
+ op->src.offset = insn.displacement.value;
+ }
+ op->src.reg = CFI_SP;
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = op_to_cfi_reg[modrm_reg][rex_r];
+
+ } else if (rex == 0x48 && modrm == 0x65) {
+
+ /* lea disp(%rbp), %rsp */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_ADD;
+ op->src.reg = CFI_BP;
+ op->src.offset = insn.displacement.value;
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = CFI_SP;
+
+ } else if (rex == 0x49 && modrm == 0x62 &&
+ insn.displacement.value == -8) {
+
+ /*
+ * lea -0x8(%r10), %rsp
+ *
+ * Restoring rsp back to its original value after a
+ * stack realignment.
+ */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_ADD;
+ op->src.reg = CFI_R10;
+ op->src.offset = -8;
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = CFI_SP;
+
+ } else if (rex == 0x49 && modrm == 0x65 &&
+ insn.displacement.value == -16) {
+
+ /*
+ * lea -0x10(%r13), %rsp
+ *
+ * Restoring rsp back to its original value after a
+ * stack realignment.
+ */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_ADD;
+ op->src.reg = CFI_R13;
+ op->src.offset = -16;
+ op->dest.type = OP_DEST_REG;
+ op->dest.reg = CFI_SP;
+ }
+
+ break;
+
+ case 0x8f:
+ /* pop to mem */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_POP;
+ op->dest.type = OP_DEST_MEM;
+ break;
+
+ case 0x90:
+ *type = INSN_NOP;
+ break;
+
+ case 0x9c:
+ /* pushf */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_CONST;
+ op->dest.type = OP_DEST_PUSHF;
+ break;
+
+ case 0x9d:
+ /* popf */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_POPF;
+ op->dest.type = OP_DEST_MEM;
+ break;
+
+ case 0x0f:
+
+ if (op2 == 0x01) {
+
+ if (modrm == 0xca)
+ *type = INSN_CLAC;
+ else if (modrm == 0xcb)
+ *type = INSN_STAC;
+
+ } else if (op2 >= 0x80 && op2 <= 0x8f) {
+
+ *type = INSN_JUMP_CONDITIONAL;
+
+ } else if (op2 == 0x05 || op2 == 0x07 || op2 == 0x34 ||
+ op2 == 0x35) {
+
+ /* sysenter, sysret */
+ *type = INSN_CONTEXT_SWITCH;
+
+ } else if (op2 == 0x0b || op2 == 0xb9) {
+
+ /* ud2 */
+ *type = INSN_BUG;
+
+ } else if (op2 == 0x0d || op2 == 0x1f) {
+
+ /* nopl/nopw */
+ *type = INSN_NOP;
+
+ } else if (op2 == 0xa0 || op2 == 0xa8) {
+
+ /* push fs/gs */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_CONST;
+ op->dest.type = OP_DEST_PUSH;
+
+ } else if (op2 == 0xa1 || op2 == 0xa9) {
+
+ /* pop fs/gs */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_POP;
+ op->dest.type = OP_DEST_MEM;
+ }
+
+ break;
+
+ case 0xc9:
+ /*
+ * leave
+ *
+ * equivalent to:
+ * mov bp, sp
+ * pop bp
+ */
+ *type = INSN_STACK;
+ op->dest.type = OP_DEST_LEAVE;
+
+ break;
+
+ case 0xe3:
+ /* jecxz/jrcxz */
+ *type = INSN_JUMP_CONDITIONAL;
+ break;
+
+ case 0xe9:
+ case 0xeb:
+ *type = INSN_JUMP_UNCONDITIONAL;
+ break;
+
+ case 0xc2:
+ case 0xc3:
+ *type = INSN_RETURN;
+ break;
+
+ case 0xca: /* retf */
+ case 0xcb: /* retf */
+ case 0xcf: /* iret */
+ *type = INSN_CONTEXT_SWITCH;
+ break;
+
+ case 0xe8:
+ *type = INSN_CALL;
+ /*
+ * For the impact on the stack, a CALL behaves like
+ * a PUSH of an immediate value (the return address).
+ */
+ op->src.type = OP_SRC_CONST;
+ op->dest.type = OP_DEST_PUSH;
+ break;
+
+ case 0xfc:
+ *type = INSN_CLD;
+ break;
+
+ case 0xfd:
+ *type = INSN_STD;
+ break;
+
+ case 0xff:
+ if (modrm_reg == 2 || modrm_reg == 3)
+
+ *type = INSN_CALL_DYNAMIC;
+
+ else if (modrm_reg == 4)
+
+ *type = INSN_JUMP_DYNAMIC;
+
+ else if (modrm_reg == 5)
+
+ /* jmpf */
+ *type = INSN_CONTEXT_SWITCH;
+
+ else if (modrm_reg == 6) {
+
+ /* push from mem */
+ *type = INSN_STACK;
+ op->src.type = OP_SRC_CONST;
+ op->dest.type = OP_DEST_PUSH;
+ }
+
+ break;
+
+ default:
+ break;
+ }
+
+ *immediate = insn.immediate.nbytes ? insn.immediate.value : 0;
+
+ return 0;
+}
+
+void arch_initial_func_cfi_state(struct cfi_state *state)
+{
+ int i;
+
+ for (i = 0; i < CFI_NUM_REGS; i++) {
+ state->regs[i].base = CFI_UNDEFINED;
+ state->regs[i].offset = 0;
+ }
+
+ /* initial CFA (call frame address) */
+ state->cfa.base = CFI_SP;
+ state->cfa.offset = 8;
+
+ /* initial RA (return address) */
+ state->regs[16].base = CFI_CFA;
+ state->regs[16].offset = -8;
+}
diff --git a/marvell/linux/tools/objtool/builtin-check.c b/marvell/linux/tools/objtool/builtin-check.c
new file mode 100644
index 0000000..c807984
--- /dev/null
+++ b/marvell/linux/tools/objtool/builtin-check.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+/*
+ * objtool check:
+ *
+ * This command analyzes every .o file and ensures the validity of its stack
+ * trace metadata. It enforces a set of rules on asm code and C inline
+ * assembly code so that stack traces can be reliable.
+ *
+ * For more information, see tools/objtool/Documentation/stack-validation.txt.
+ */
+
+#include <subcmd/parse-options.h>
+#include "builtin.h"
+#include "check.h"
+
+bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess;
+
+static const char * const check_usage[] = {
+ "objtool check [<options>] file.o",
+ NULL,
+};
+
+const struct option check_options[] = {
+ OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"),
+ OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"),
+ OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"),
+ OPT_BOOLEAN('m', "module", &module, "Indicates the object will be part of a kernel module"),
+ OPT_BOOLEAN('b', "backtrace", &backtrace, "unwind on error"),
+ OPT_BOOLEAN('a', "uaccess", &uaccess, "enable uaccess checking"),
+ OPT_END(),
+};
+
+int cmd_check(int argc, const char **argv)
+{
+ const char *objname;
+
+ argc = parse_options(argc, argv, check_options, check_usage, 0);
+
+ if (argc != 1)
+ usage_with_options(check_usage, check_options);
+
+ objname = argv[0];
+
+ return check(objname, false);
+}
diff --git a/marvell/linux/tools/objtool/builtin-orc.c b/marvell/linux/tools/objtool/builtin-orc.c
new file mode 100644
index 0000000..5f7cc61
--- /dev/null
+++ b/marvell/linux/tools/objtool/builtin-orc.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+/*
+ * objtool orc:
+ *
+ * This command analyzes a .o file and adds .orc_unwind and .orc_unwind_ip
+ * sections to it, which is used by the in-kernel ORC unwinder.
+ *
+ * This command is a superset of "objtool check".
+ */
+
+#include <string.h>
+#include "builtin.h"
+#include "check.h"
+
+
+static const char *orc_usage[] = {
+ "objtool orc generate [<options>] file.o",
+ "objtool orc dump file.o",
+ NULL,
+};
+
+int cmd_orc(int argc, const char **argv)
+{
+ const char *objname;
+
+ argc--; argv++;
+ if (argc <= 0)
+ usage_with_options(orc_usage, check_options);
+
+ if (!strncmp(argv[0], "gen", 3)) {
+ argc = parse_options(argc, argv, check_options, orc_usage, 0);
+ if (argc != 1)
+ usage_with_options(orc_usage, check_options);
+
+ objname = argv[0];
+
+ return check(objname, true);
+ }
+
+ if (!strcmp(argv[0], "dump")) {
+ if (argc != 2)
+ usage_with_options(orc_usage, check_options);
+
+ objname = argv[1];
+
+ return orc_dump(objname);
+ }
+
+ usage_with_options(orc_usage, check_options);
+
+ return 0;
+}
diff --git a/marvell/linux/tools/objtool/builtin.h b/marvell/linux/tools/objtool/builtin.h
new file mode 100644
index 0000000..a32736f
--- /dev/null
+++ b/marvell/linux/tools/objtool/builtin.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+#ifndef _BUILTIN_H
+#define _BUILTIN_H
+
+#include <subcmd/parse-options.h>
+
+extern const struct option check_options[];
+extern bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess;
+
+extern int cmd_check(int argc, const char **argv);
+extern int cmd_orc(int argc, const char **argv);
+
+#endif /* _BUILTIN_H */
diff --git a/marvell/linux/tools/objtool/cfi.h b/marvell/linux/tools/objtool/cfi.h
new file mode 100644
index 0000000..4427bf8
--- /dev/null
+++ b/marvell/linux/tools/objtool/cfi.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+#ifndef _OBJTOOL_CFI_H
+#define _OBJTOOL_CFI_H
+
+#define CFI_UNDEFINED -1
+#define CFI_CFA -2
+#define CFI_SP_INDIRECT -3
+#define CFI_BP_INDIRECT -4
+
+#define CFI_AX 0
+#define CFI_DX 1
+#define CFI_CX 2
+#define CFI_BX 3
+#define CFI_SI 4
+#define CFI_DI 5
+#define CFI_BP 6
+#define CFI_SP 7
+#define CFI_R8 8
+#define CFI_R9 9
+#define CFI_R10 10
+#define CFI_R11 11
+#define CFI_R12 12
+#define CFI_R13 13
+#define CFI_R14 14
+#define CFI_R15 15
+#define CFI_RA 16
+#define CFI_NUM_REGS 17
+
+struct cfi_reg {
+ int base;
+ int offset;
+};
+
+struct cfi_state {
+ struct cfi_reg cfa;
+ struct cfi_reg regs[CFI_NUM_REGS];
+};
+
+#endif /* _OBJTOOL_CFI_H */
diff --git a/marvell/linux/tools/objtool/check.c b/marvell/linux/tools/objtool/check.c
new file mode 100644
index 0000000..c849533
--- /dev/null
+++ b/marvell/linux/tools/objtool/check.c
@@ -0,0 +1,2574 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+#include <string.h>
+#include <stdlib.h>
+
+#include "builtin.h"
+#include "check.h"
+#include "elf.h"
+#include "special.h"
+#include "arch.h"
+#include "warn.h"
+
+#include <linux/hashtable.h>
+#include <linux/kernel.h>
+
+#define FAKE_JUMP_OFFSET -1
+
+#define C_JUMP_TABLE_SECTION ".rodata..c_jump_table"
+
+struct alternative {
+ struct list_head list;
+ struct instruction *insn;
+ bool skip_orig;
+};
+
+const char *objname;
+struct cfi_state initial_func_cfi;
+
+struct instruction *find_insn(struct objtool_file *file,
+ struct section *sec, unsigned long offset)
+{
+ struct instruction *insn;
+
+ hash_for_each_possible(file->insn_hash, insn, hash, offset)
+ if (insn->sec == sec && insn->offset == offset)
+ return insn;
+
+ return NULL;
+}
+
+static struct instruction *next_insn_same_sec(struct objtool_file *file,
+ struct instruction *insn)
+{
+ struct instruction *next = list_next_entry(insn, list);
+
+ if (!next || &next->list == &file->insn_list || next->sec != insn->sec)
+ return NULL;
+
+ return next;
+}
+
+static struct instruction *next_insn_same_func(struct objtool_file *file,
+ struct instruction *insn)
+{
+ struct instruction *next = list_next_entry(insn, list);
+ struct symbol *func = insn->func;
+
+ if (!func)
+ return NULL;
+
+ if (&next->list != &file->insn_list && next->func == func)
+ return next;
+
+ /* Check if we're already in the subfunction: */
+ if (func == func->cfunc)
+ return NULL;
+
+ /* Move to the subfunction: */
+ return find_insn(file, func->cfunc->sec, func->cfunc->offset);
+}
+
+#define func_for_each_insn_all(file, func, insn) \
+ for (insn = find_insn(file, func->sec, func->offset); \
+ insn; \
+ insn = next_insn_same_func(file, insn))
+
+#define func_for_each_insn(file, func, insn) \
+ for (insn = find_insn(file, func->sec, func->offset); \
+ insn && &insn->list != &file->insn_list && \
+ insn->sec == func->sec && \
+ insn->offset < func->offset + func->len; \
+ insn = list_next_entry(insn, list))
+
+#define func_for_each_insn_continue_reverse(file, func, insn) \
+ for (insn = list_prev_entry(insn, list); \
+ &insn->list != &file->insn_list && \
+ insn->sec == func->sec && insn->offset >= func->offset; \
+ insn = list_prev_entry(insn, list))
+
+#define sec_for_each_insn_from(file, insn) \
+ for (; insn; insn = next_insn_same_sec(file, insn))
+
+#define sec_for_each_insn_continue(file, insn) \
+ for (insn = next_insn_same_sec(file, insn); insn; \
+ insn = next_insn_same_sec(file, insn))
+
+static bool is_sibling_call(struct instruction *insn)
+{
+ /* An indirect jump is either a sibling call or a jump to a table. */
+ if (insn->type == INSN_JUMP_DYNAMIC)
+ return list_empty(&insn->alts);
+
+ if (insn->type != INSN_JUMP_CONDITIONAL &&
+ insn->type != INSN_JUMP_UNCONDITIONAL)
+ return false;
+
+ /* add_jump_destinations() sets insn->call_dest for sibling calls. */
+ return !!insn->call_dest;
+}
+
+/*
+ * This checks to see if the given function is a "noreturn" function.
+ *
+ * For global functions which are outside the scope of this object file, we
+ * have to keep a manual list of them.
+ *
+ * For local functions, we have to detect them manually by simply looking for
+ * the lack of a return instruction.
+ */
+static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
+ int recursion)
+{
+ int i;
+ struct instruction *insn;
+ bool empty = true;
+
+ /*
+ * Unfortunately these have to be hard coded because the noreturn
+ * attribute isn't provided in ELF data.
+ */
+ static const char * const global_noreturns[] = {
+ "__stack_chk_fail",
+ "panic",
+ "do_exit",
+ "do_task_dead",
+ "make_task_dead",
+ "__module_put_and_exit",
+ "complete_and_exit",
+ "__reiserfs_panic",
+ "lbug_with_loc",
+ "fortify_panic",
+ "usercopy_abort",
+ "machine_real_restart",
+ "rewind_stack_and_make_dead",
+ "kunit_try_catch_throw",
+ "cpu_bringup_and_idle",
+ };
+
+ if (!func)
+ return false;
+
+ if (func->bind == STB_WEAK)
+ return false;
+
+ if (func->bind == STB_GLOBAL)
+ for (i = 0; i < ARRAY_SIZE(global_noreturns); i++)
+ if (!strcmp(func->name, global_noreturns[i]))
+ return true;
+
+ if (!func->len)
+ return false;
+
+ insn = find_insn(file, func->sec, func->offset);
+ if (!insn || !insn->func)
+ return false;
+
+ func_for_each_insn_all(file, func, insn) {
+ empty = false;
+
+ if (insn->type == INSN_RETURN)
+ return false;
+ }
+
+ if (empty)
+ return false;
+
+ /*
+ * A function can have a sibling call instead of a return. In that
+ * case, the function's dead-end status depends on whether the target
+ * of the sibling call returns.
+ */
+ func_for_each_insn_all(file, func, insn) {
+ if (is_sibling_call(insn)) {
+ struct instruction *dest = insn->jump_dest;
+
+ if (!dest)
+ /* sibling call to another file */
+ return false;
+
+ /* local sibling call */
+ if (recursion == 5) {
+ /*
+ * Infinite recursion: two functions have
+ * sibling calls to each other. This is a very
+ * rare case. It means they aren't dead ends.
+ */
+ return false;
+ }
+
+ return __dead_end_function(file, dest->func, recursion+1);
+ }
+ }
+
+ return true;
+}
+
+static bool dead_end_function(struct objtool_file *file, struct symbol *func)
+{
+ return __dead_end_function(file, func, 0);
+}
+
+static void clear_insn_state(struct insn_state *state)
+{
+ int i;
+
+ memset(state, 0, sizeof(*state));
+ state->cfa.base = CFI_UNDEFINED;
+ for (i = 0; i < CFI_NUM_REGS; i++) {
+ state->regs[i].base = CFI_UNDEFINED;
+ state->vals[i].base = CFI_UNDEFINED;
+ }
+ state->drap_reg = CFI_UNDEFINED;
+ state->drap_offset = -1;
+}
+
+/*
+ * Call the arch-specific instruction decoder for all the instructions and add
+ * them to the global instruction list.
+ */
+static int decode_instructions(struct objtool_file *file)
+{
+ struct section *sec;
+ struct symbol *func;
+ unsigned long offset;
+ struct instruction *insn;
+ int ret;
+
+ for_each_sec(file, sec) {
+
+ if (!(sec->sh.sh_flags & SHF_EXECINSTR))
+ continue;
+
+ if (strcmp(sec->name, ".altinstr_replacement") &&
+ strcmp(sec->name, ".altinstr_aux") &&
+ strncmp(sec->name, ".discard.", 9))
+ sec->text = true;
+
+ for (offset = 0; offset < sec->len; offset += insn->len) {
+ insn = malloc(sizeof(*insn));
+ if (!insn) {
+ WARN("malloc failed");
+ return -1;
+ }
+ memset(insn, 0, sizeof(*insn));
+ INIT_LIST_HEAD(&insn->alts);
+ clear_insn_state(&insn->state);
+
+ insn->sec = sec;
+ insn->offset = offset;
+
+ ret = arch_decode_instruction(file->elf, sec, offset,
+ sec->len - offset,
+ &insn->len, &insn->type,
+ &insn->immediate,
+ &insn->stack_op);
+ if (ret)
+ goto err;
+
+ hash_add(file->insn_hash, &insn->hash, insn->offset);
+ list_add_tail(&insn->list, &file->insn_list);
+ }
+
+ list_for_each_entry(func, &sec->symbol_list, list) {
+ if (func->type != STT_FUNC || func->alias != func)
+ continue;
+
+ if (!find_insn(file, sec, func->offset)) {
+ WARN("%s(): can't find starting instruction",
+ func->name);
+ return -1;
+ }
+
+ func_for_each_insn(file, func, insn)
+ insn->func = func;
+ }
+ }
+
+ return 0;
+
+err:
+ free(insn);
+ return ret;
+}
+
+/*
+ * Mark "ud2" instructions and manually annotated dead ends.
+ */
+static int add_dead_ends(struct objtool_file *file)
+{
+ struct section *sec;
+ struct rela *rela;
+ struct instruction *insn;
+ bool found;
+
+ /*
+ * By default, "ud2" is a dead end unless otherwise annotated, because
+ * GCC 7 inserts it for certain divide-by-zero cases.
+ */
+ for_each_insn(file, insn)
+ if (insn->type == INSN_BUG)
+ insn->dead_end = true;
+
+ /*
+ * Check for manually annotated dead ends.
+ */
+ sec = find_section_by_name(file->elf, ".rela.discard.unreachable");
+ if (!sec)
+ goto reachable;
+
+ list_for_each_entry(rela, &sec->rela_list, list) {
+ if (rela->sym->type != STT_SECTION) {
+ WARN("unexpected relocation symbol type in %s", sec->name);
+ return -1;
+ }
+ insn = find_insn(file, rela->sym->sec, rela->addend);
+ if (insn)
+ insn = list_prev_entry(insn, list);
+ else if (rela->addend == rela->sym->sec->len) {
+ found = false;
+ list_for_each_entry_reverse(insn, &file->insn_list, list) {
+ if (insn->sec == rela->sym->sec) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ WARN("can't find unreachable insn at %s+0x%x",
+ rela->sym->sec->name, rela->addend);
+ return -1;
+ }
+ } else {
+ WARN("can't find unreachable insn at %s+0x%x",
+ rela->sym->sec->name, rela->addend);
+ return -1;
+ }
+
+ insn->dead_end = true;
+ }
+
+reachable:
+ /*
+ * These manually annotated reachable checks are needed for GCC 4.4,
+ * where the Linux unreachable() macro isn't supported. In that case
+ * GCC doesn't know the "ud2" is fatal, so it generates code as if it's
+ * not a dead end.
+ */
+ sec = find_section_by_name(file->elf, ".rela.discard.reachable");
+ if (!sec)
+ return 0;
+
+ list_for_each_entry(rela, &sec->rela_list, list) {
+ if (rela->sym->type != STT_SECTION) {
+ WARN("unexpected relocation symbol type in %s", sec->name);
+ return -1;
+ }
+ insn = find_insn(file, rela->sym->sec, rela->addend);
+ if (insn)
+ insn = list_prev_entry(insn, list);
+ else if (rela->addend == rela->sym->sec->len) {
+ found = false;
+ list_for_each_entry_reverse(insn, &file->insn_list, list) {
+ if (insn->sec == rela->sym->sec) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ WARN("can't find reachable insn at %s+0x%x",
+ rela->sym->sec->name, rela->addend);
+ return -1;
+ }
+ } else {
+ WARN("can't find reachable insn at %s+0x%x",
+ rela->sym->sec->name, rela->addend);
+ return -1;
+ }
+
+ insn->dead_end = false;
+ }
+
+ return 0;
+}
+
+/*
+ * Warnings shouldn't be reported for ignored functions.
+ */
+static void add_ignores(struct objtool_file *file)
+{
+ struct instruction *insn;
+ struct section *sec;
+ struct symbol *func;
+ struct rela *rela;
+
+ sec = find_section_by_name(file->elf, ".rela.discard.func_stack_frame_non_standard");
+ if (!sec)
+ return;
+
+ list_for_each_entry(rela, &sec->rela_list, list) {
+ switch (rela->sym->type) {
+ case STT_FUNC:
+ func = rela->sym;
+ break;
+
+ case STT_SECTION:
+ func = find_symbol_by_offset(rela->sym->sec, rela->addend);
+ if (!func || func->type != STT_FUNC)
+ continue;
+ break;
+
+ default:
+ WARN("unexpected relocation symbol type in %s: %d", sec->name, rela->sym->type);
+ continue;
+ }
+
+ func_for_each_insn_all(file, func, insn)
+ insn->ignore = true;
+ }
+}
+
+/*
+ * This is a whitelist of functions that is allowed to be called with AC set.
+ * The list is meant to be minimal and only contains compiler instrumentation
+ * ABI and a few functions used to implement *_{to,from}_user() functions.
+ *
+ * These functions must not directly change AC, but may PUSHF/POPF.
+ */
+static const char *uaccess_safe_builtin[] = {
+ /* KASAN */
+ "kasan_report",
+ "check_memory_region",
+ /* KASAN out-of-line */
+ "__asan_loadN_noabort",
+ "__asan_load1_noabort",
+ "__asan_load2_noabort",
+ "__asan_load4_noabort",
+ "__asan_load8_noabort",
+ "__asan_load16_noabort",
+ "__asan_storeN_noabort",
+ "__asan_store1_noabort",
+ "__asan_store2_noabort",
+ "__asan_store4_noabort",
+ "__asan_store8_noabort",
+ "__asan_store16_noabort",
+ /* KASAN in-line */
+ "__asan_report_load_n_noabort",
+ "__asan_report_load1_noabort",
+ "__asan_report_load2_noabort",
+ "__asan_report_load4_noabort",
+ "__asan_report_load8_noabort",
+ "__asan_report_load16_noabort",
+ "__asan_report_store_n_noabort",
+ "__asan_report_store1_noabort",
+ "__asan_report_store2_noabort",
+ "__asan_report_store4_noabort",
+ "__asan_report_store8_noabort",
+ "__asan_report_store16_noabort",
+ /* KCOV */
+ "write_comp_data",
+ "__sanitizer_cov_trace_pc",
+ "__sanitizer_cov_trace_const_cmp1",
+ "__sanitizer_cov_trace_const_cmp2",
+ "__sanitizer_cov_trace_const_cmp4",
+ "__sanitizer_cov_trace_const_cmp8",
+ "__sanitizer_cov_trace_cmp1",
+ "__sanitizer_cov_trace_cmp2",
+ "__sanitizer_cov_trace_cmp4",
+ "__sanitizer_cov_trace_cmp8",
+ /* UBSAN */
+ "ubsan_type_mismatch_common",
+ "__ubsan_handle_type_mismatch",
+ "__ubsan_handle_type_mismatch_v1",
+ "__ubsan_handle_shift_out_of_bounds",
+ /* misc */
+ "csum_partial_copy_generic",
+ "__memcpy_mcsafe",
+ "mcsafe_handle_tail",
+ "ftrace_likely_update", /* CONFIG_TRACE_BRANCH_PROFILING */
+ NULL
+};
+
+static void add_uaccess_safe(struct objtool_file *file)
+{
+ struct symbol *func;
+ const char **name;
+
+ if (!uaccess)
+ return;
+
+ for (name = uaccess_safe_builtin; *name; name++) {
+ func = find_symbol_by_name(file->elf, *name);
+ if (!func)
+ continue;
+
+ func->uaccess_safe = true;
+ }
+}
+
+/*
+ * FIXME: For now, just ignore any alternatives which add retpolines. This is
+ * a temporary hack, as it doesn't allow ORC to unwind from inside a retpoline.
+ * But it at least allows objtool to understand the control flow *around* the
+ * retpoline.
+ */
+static int add_ignore_alternatives(struct objtool_file *file)
+{
+ struct section *sec;
+ struct rela *rela;
+ struct instruction *insn;
+
+ sec = find_section_by_name(file->elf, ".rela.discard.ignore_alts");
+ if (!sec)
+ return 0;
+
+ list_for_each_entry(rela, &sec->rela_list, list) {
+ if (rela->sym->type != STT_SECTION) {
+ WARN("unexpected relocation symbol type in %s", sec->name);
+ return -1;
+ }
+
+ insn = find_insn(file, rela->sym->sec, rela->addend);
+ if (!insn) {
+ WARN("bad .discard.ignore_alts entry");
+ return -1;
+ }
+
+ insn->ignore_alts = true;
+ }
+
+ return 0;
+}
+
+/*
+ * Find the destination instructions for all jumps.
+ */
+static int add_jump_destinations(struct objtool_file *file)
+{
+ struct instruction *insn;
+ struct rela *rela;
+ struct section *dest_sec;
+ unsigned long dest_off;
+
+ for_each_insn(file, insn) {
+ if (insn->type != INSN_JUMP_CONDITIONAL &&
+ insn->type != INSN_JUMP_UNCONDITIONAL)
+ continue;
+
+ if (insn->offset == FAKE_JUMP_OFFSET)
+ continue;
+
+ rela = find_rela_by_dest_range(insn->sec, insn->offset,
+ insn->len);
+ if (!rela) {
+ dest_sec = insn->sec;
+ dest_off = insn->offset + insn->len + insn->immediate;
+ } else if (rela->sym->type == STT_SECTION) {
+ dest_sec = rela->sym->sec;
+ dest_off = rela->addend + 4;
+ } else if (rela->sym->sec->idx) {
+ dest_sec = rela->sym->sec;
+ dest_off = rela->sym->sym.st_value + rela->addend + 4;
+ } else if (strstr(rela->sym->name, "_indirect_thunk_")) {
+ /*
+ * Retpoline jumps are really dynamic jumps in
+ * disguise, so convert them accordingly.
+ */
+ if (insn->type == INSN_JUMP_UNCONDITIONAL)
+ insn->type = INSN_JUMP_DYNAMIC;
+ else
+ insn->type = INSN_JUMP_DYNAMIC_CONDITIONAL;
+
+ insn->retpoline_safe = true;
+ continue;
+ } else {
+ /* external sibling call */
+ insn->call_dest = rela->sym;
+ continue;
+ }
+
+ insn->jump_dest = find_insn(file, dest_sec, dest_off);
+ if (!insn->jump_dest) {
+
+ /*
+ * This is a special case where an alt instruction
+ * jumps past the end of the section. These are
+ * handled later in handle_group_alt().
+ */
+ if (!strcmp(insn->sec->name, ".altinstr_replacement"))
+ continue;
+
+ WARN_FUNC("can't find jump dest instruction at %s+0x%lx",
+ insn->sec, insn->offset, dest_sec->name,
+ dest_off);
+ return -1;
+ }
+
+ /*
+ * Cross-function jump.
+ */
+ if (insn->func && insn->jump_dest->func &&
+ insn->func != insn->jump_dest->func) {
+
+ /*
+ * For GCC 8+, create parent/child links for any cold
+ * subfunctions. This is _mostly_ redundant with a
+ * similar initialization in read_symbols().
+ *
+ * If a function has aliases, we want the *first* such
+ * function in the symbol table to be the subfunction's
+ * parent. In that case we overwrite the
+ * initialization done in read_symbols().
+ *
+ * However this code can't completely replace the
+ * read_symbols() code because this doesn't detect the
+ * case where the parent function's only reference to a
+ * subfunction is through a jump table.
+ */
+ if (!strstr(insn->func->name, ".cold") &&
+ strstr(insn->jump_dest->func->name, ".cold")) {
+ insn->func->cfunc = insn->jump_dest->func;
+ insn->jump_dest->func->pfunc = insn->func;
+
+ } else if (insn->jump_dest->func->pfunc != insn->func->pfunc &&
+ insn->jump_dest->offset == insn->jump_dest->func->offset) {
+
+ /* internal sibling call */
+ insn->call_dest = insn->jump_dest->func;
+ }
+ }
+ }
+
+ return 0;
+}
+
+
+/*
+ * Find the destination instructions for all calls.
+ */
+static int add_call_destinations(struct objtool_file *file)
+{
+ struct instruction *insn;
+ unsigned long dest_off;
+ struct rela *rela;
+
+ for_each_insn(file, insn) {
+ if (insn->type != INSN_CALL)
+ continue;
+
+ rela = find_rela_by_dest_range(insn->sec, insn->offset,
+ insn->len);
+ if (!rela) {
+ dest_off = insn->offset + insn->len + insn->immediate;
+ insn->call_dest = find_symbol_by_offset(insn->sec,
+ dest_off);
+
+ if (!insn->call_dest && !insn->ignore) {
+ WARN_FUNC("unannotated intra-function call", insn->sec, insn->offset);
+ return -1;
+ }
+
+ } else if (rela->sym->type == STT_SECTION) {
+ insn->call_dest = find_symbol_by_offset(rela->sym->sec,
+ rela->addend+4);
+ if (!insn->call_dest ||
+ insn->call_dest->type != STT_FUNC) {
+ WARN_FUNC("can't find call dest symbol at %s+0x%x",
+ insn->sec, insn->offset,
+ rela->sym->sec->name,
+ rela->addend + 4);
+ return -1;
+ }
+ } else
+ insn->call_dest = rela->sym;
+ }
+
+ return 0;
+}
+
+/*
+ * The .alternatives section requires some extra special care, over and above
+ * what other special sections require:
+ *
+ * 1. Because alternatives are patched in-place, we need to insert a fake jump
+ * instruction at the end so that validate_branch() skips all the original
+ * replaced instructions when validating the new instruction path.
+ *
+ * 2. An added wrinkle is that the new instruction length might be zero. In
+ * that case the old instructions are replaced with noops. We simulate that
+ * by creating a fake jump as the only new instruction.
+ *
+ * 3. In some cases, the alternative section includes an instruction which
+ * conditionally jumps to the _end_ of the entry. We have to modify these
+ * jumps' destinations to point back to .text rather than the end of the
+ * entry in .altinstr_replacement.
+ */
+static int handle_group_alt(struct objtool_file *file,
+ struct special_alt *special_alt,
+ struct instruction *orig_insn,
+ struct instruction **new_insn)
+{
+ struct instruction *last_orig_insn, *last_new_insn, *insn, *fake_jump = NULL;
+ unsigned long dest_off;
+
+ last_orig_insn = NULL;
+ insn = orig_insn;
+ sec_for_each_insn_from(file, insn) {
+ if (insn->offset >= special_alt->orig_off + special_alt->orig_len)
+ break;
+
+ insn->alt_group = true;
+ last_orig_insn = insn;
+ }
+
+ if (next_insn_same_sec(file, last_orig_insn)) {
+ fake_jump = malloc(sizeof(*fake_jump));
+ if (!fake_jump) {
+ WARN("malloc failed");
+ return -1;
+ }
+ memset(fake_jump, 0, sizeof(*fake_jump));
+ INIT_LIST_HEAD(&fake_jump->alts);
+ clear_insn_state(&fake_jump->state);
+
+ fake_jump->sec = special_alt->new_sec;
+ fake_jump->offset = FAKE_JUMP_OFFSET;
+ fake_jump->type = INSN_JUMP_UNCONDITIONAL;
+ fake_jump->jump_dest = list_next_entry(last_orig_insn, list);
+ fake_jump->func = orig_insn->func;
+ }
+
+ if (!special_alt->new_len) {
+ if (!fake_jump) {
+ WARN("%s: empty alternative at end of section",
+ special_alt->orig_sec->name);
+ return -1;
+ }
+
+ *new_insn = fake_jump;
+ return 0;
+ }
+
+ last_new_insn = NULL;
+ insn = *new_insn;
+ sec_for_each_insn_from(file, insn) {
+ if (insn->offset >= special_alt->new_off + special_alt->new_len)
+ break;
+
+ last_new_insn = insn;
+
+ insn->ignore = orig_insn->ignore_alts;
+ insn->func = orig_insn->func;
+
+ if (insn->type != INSN_JUMP_CONDITIONAL &&
+ insn->type != INSN_JUMP_UNCONDITIONAL)
+ continue;
+
+ if (!insn->immediate)
+ continue;
+
+ dest_off = insn->offset + insn->len + insn->immediate;
+ if (dest_off == special_alt->new_off + special_alt->new_len) {
+ if (!fake_jump) {
+ WARN("%s: alternative jump to end of section",
+ special_alt->orig_sec->name);
+ return -1;
+ }
+ insn->jump_dest = fake_jump;
+ }
+
+ if (!insn->jump_dest) {
+ WARN_FUNC("can't find alternative jump destination",
+ insn->sec, insn->offset);
+ return -1;
+ }
+ }
+
+ if (!last_new_insn) {
+ WARN_FUNC("can't find last new alternative instruction",
+ special_alt->new_sec, special_alt->new_off);
+ return -1;
+ }
+
+ if (fake_jump)
+ list_add(&fake_jump->list, &last_new_insn->list);
+
+ return 0;
+}
+
+/*
+ * A jump table entry can either convert a nop to a jump or a jump to a nop.
+ * If the original instruction is a jump, make the alt entry an effective nop
+ * by just skipping the original instruction.
+ */
+static int handle_jump_alt(struct objtool_file *file,
+ struct special_alt *special_alt,
+ struct instruction *orig_insn,
+ struct instruction **new_insn)
+{
+ if (orig_insn->type == INSN_NOP)
+ return 0;
+
+ if (orig_insn->type != INSN_JUMP_UNCONDITIONAL) {
+ WARN_FUNC("unsupported instruction at jump label",
+ orig_insn->sec, orig_insn->offset);
+ return -1;
+ }
+
+ *new_insn = list_next_entry(orig_insn, list);
+ return 0;
+}
+
+/*
+ * Read all the special sections which have alternate instructions which can be
+ * patched in or redirected to at runtime. Each instruction having alternate
+ * instruction(s) has them added to its insn->alts list, which will be
+ * traversed in validate_branch().
+ */
+static int add_special_section_alts(struct objtool_file *file)
+{
+ struct list_head special_alts;
+ struct instruction *orig_insn, *new_insn;
+ struct special_alt *special_alt, *tmp;
+ struct alternative *alt;
+ int ret;
+
+ ret = special_get_alts(file->elf, &special_alts);
+ if (ret)
+ return ret;
+
+ list_for_each_entry_safe(special_alt, tmp, &special_alts, list) {
+
+ orig_insn = find_insn(file, special_alt->orig_sec,
+ special_alt->orig_off);
+ if (!orig_insn) {
+ WARN_FUNC("special: can't find orig instruction",
+ special_alt->orig_sec, special_alt->orig_off);
+ ret = -1;
+ goto out;
+ }
+
+ new_insn = NULL;
+ if (!special_alt->group || special_alt->new_len) {
+ new_insn = find_insn(file, special_alt->new_sec,
+ special_alt->new_off);
+ if (!new_insn) {
+ WARN_FUNC("special: can't find new instruction",
+ special_alt->new_sec,
+ special_alt->new_off);
+ ret = -1;
+ goto out;
+ }
+ }
+
+ if (special_alt->group) {
+ if (!special_alt->orig_len) {
+ WARN_FUNC("empty alternative entry",
+ orig_insn->sec, orig_insn->offset);
+ continue;
+ }
+
+ ret = handle_group_alt(file, special_alt, orig_insn,
+ &new_insn);
+ if (ret)
+ goto out;
+ } else if (special_alt->jump_or_nop) {
+ ret = handle_jump_alt(file, special_alt, orig_insn,
+ &new_insn);
+ if (ret)
+ goto out;
+ }
+
+ alt = malloc(sizeof(*alt));
+ if (!alt) {
+ WARN("malloc failed");
+ ret = -1;
+ goto out;
+ }
+
+ alt->insn = new_insn;
+ alt->skip_orig = special_alt->skip_orig;
+ orig_insn->ignore_alts |= special_alt->skip_alt;
+ list_add_tail(&alt->list, &orig_insn->alts);
+
+ list_del(&special_alt->list);
+ free(special_alt);
+ }
+
+out:
+ return ret;
+}
+
+static int add_jump_table(struct objtool_file *file, struct instruction *insn,
+ struct rela *table)
+{
+ struct rela *rela = table;
+ struct instruction *dest_insn;
+ struct alternative *alt;
+ struct symbol *pfunc = insn->func->pfunc;
+ unsigned int prev_offset = 0;
+
+ /*
+ * Each @rela is a switch table relocation which points to the target
+ * instruction.
+ */
+ list_for_each_entry_from(rela, &table->sec->rela_list, list) {
+
+ /* Check for the end of the table: */
+ if (rela != table && rela->jump_table_start)
+ break;
+
+ /* Make sure the table entries are consecutive: */
+ if (prev_offset && rela->offset != prev_offset + 8)
+ break;
+
+ /* Detect function pointers from contiguous objects: */
+ if (rela->sym->sec == pfunc->sec &&
+ rela->addend == pfunc->offset)
+ break;
+
+ dest_insn = find_insn(file, rela->sym->sec, rela->addend);
+ if (!dest_insn)
+ break;
+
+ /* Make sure the destination is in the same function: */
+ if (!dest_insn->func || dest_insn->func->pfunc != pfunc)
+ break;
+
+ alt = malloc(sizeof(*alt));
+ if (!alt) {
+ WARN("malloc failed");
+ return -1;
+ }
+
+ alt->insn = dest_insn;
+ list_add_tail(&alt->list, &insn->alts);
+ prev_offset = rela->offset;
+ }
+
+ if (!prev_offset) {
+ WARN_FUNC("can't find switch jump table",
+ insn->sec, insn->offset);
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * find_jump_table() - Given a dynamic jump, find the switch jump table in
+ * .rodata associated with it.
+ *
+ * There are 3 basic patterns:
+ *
+ * 1. jmpq *[rodata addr](,%reg,8)
+ *
+ * This is the most common case by far. It jumps to an address in a simple
+ * jump table which is stored in .rodata.
+ *
+ * 2. jmpq *[rodata addr](%rip)
+ *
+ * This is caused by a rare GCC quirk, currently only seen in three driver
+ * functions in the kernel, only with certain obscure non-distro configs.
+ *
+ * As part of an optimization, GCC makes a copy of an existing switch jump
+ * table, modifies it, and then hard-codes the jump (albeit with an indirect
+ * jump) to use a single entry in the table. The rest of the jump table and
+ * some of its jump targets remain as dead code.
+ *
+ * In such a case we can just crudely ignore all unreachable instruction
+ * warnings for the entire object file. Ideally we would just ignore them
+ * for the function, but that would require redesigning the code quite a
+ * bit. And honestly that's just not worth doing: unreachable instruction
+ * warnings are of questionable value anyway, and this is such a rare issue.
+ *
+ * 3. mov [rodata addr],%reg1
+ * ... some instructions ...
+ * jmpq *(%reg1,%reg2,8)
+ *
+ * This is a fairly uncommon pattern which is new for GCC 6. As of this
+ * writing, there are 11 occurrences of it in the allmodconfig kernel.
+ *
+ * As of GCC 7 there are quite a few more of these and the 'in between' code
+ * is significant. Esp. with KASAN enabled some of the code between the mov
+ * and jmpq uses .rodata itself, which can confuse things.
+ *
+ * TODO: Once we have DWARF CFI and smarter instruction decoding logic,
+ * ensure the same register is used in the mov and jump instructions.
+ *
+ * NOTE: RETPOLINE made it harder still to decode dynamic jumps.
+ */
+static struct rela *find_jump_table(struct objtool_file *file,
+ struct symbol *func,
+ struct instruction *insn)
+{
+ struct rela *text_rela, *table_rela;
+ struct instruction *orig_insn = insn;
+ struct section *table_sec;
+ unsigned long table_offset;
+
+ /*
+ * Backward search using the @first_jump_src links, these help avoid
+ * much of the 'in between' code. Which avoids us getting confused by
+ * it.
+ */
+ for (;
+ &insn->list != &file->insn_list && insn->func && insn->func->pfunc == func;
+ insn = insn->first_jump_src ?: list_prev_entry(insn, list)) {
+
+ if (insn != orig_insn && insn->type == INSN_JUMP_DYNAMIC)
+ break;
+
+ /* allow small jumps within the range */
+ if (insn->type == INSN_JUMP_UNCONDITIONAL &&
+ insn->jump_dest &&
+ (insn->jump_dest->offset <= insn->offset ||
+ insn->jump_dest->offset > orig_insn->offset))
+ break;
+
+ /* look for a relocation which references .rodata */
+ text_rela = find_rela_by_dest_range(insn->sec, insn->offset,
+ insn->len);
+ if (!text_rela || text_rela->sym->type != STT_SECTION ||
+ !text_rela->sym->sec->rodata)
+ continue;
+
+ table_offset = text_rela->addend;
+ table_sec = text_rela->sym->sec;
+
+ if (text_rela->type == R_X86_64_PC32)
+ table_offset += 4;
+
+ /*
+ * Make sure the .rodata address isn't associated with a
+ * symbol. GCC jump tables are anonymous data.
+ *
+ * Also support C jump tables which are in the same format as
+ * switch jump tables. For objtool to recognize them, they
+ * need to be placed in the C_JUMP_TABLE_SECTION section. They
+ * have symbols associated with them.
+ */
+ if (find_symbol_containing(table_sec, table_offset) &&
+ strcmp(table_sec->name, C_JUMP_TABLE_SECTION))
+ continue;
+
+ /* Each table entry has a rela associated with it. */
+ table_rela = find_rela_by_dest(table_sec, table_offset);
+ if (!table_rela)
+ continue;
+
+ /*
+ * Use of RIP-relative switch jumps is quite rare, and
+ * indicates a rare GCC quirk/bug which can leave dead code
+ * behind.
+ */
+ if (text_rela->type == R_X86_64_PC32)
+ file->ignore_unreachables = true;
+
+ return table_rela;
+ }
+
+ return NULL;
+}
+
+/*
+ * First pass: Mark the head of each jump table so that in the next pass,
+ * we know when a given jump table ends and the next one starts.
+ */
+static void mark_func_jump_tables(struct objtool_file *file,
+ struct symbol *func)
+{
+ struct instruction *insn, *last = NULL;
+ struct rela *rela;
+
+ func_for_each_insn_all(file, func, insn) {
+ if (!last)
+ last = insn;
+
+ /*
+ * Store back-pointers for unconditional forward jumps such
+ * that find_jump_table() can back-track using those and
+ * avoid some potentially confusing code.
+ */
+ if (insn->type == INSN_JUMP_UNCONDITIONAL && insn->jump_dest &&
+ insn->offset > last->offset &&
+ insn->jump_dest->offset > insn->offset &&
+ !insn->jump_dest->first_jump_src) {
+
+ insn->jump_dest->first_jump_src = insn;
+ last = insn->jump_dest;
+ }
+
+ if (insn->type != INSN_JUMP_DYNAMIC)
+ continue;
+
+ rela = find_jump_table(file, func, insn);
+ if (rela) {
+ rela->jump_table_start = true;
+ insn->jump_table = rela;
+ }
+ }
+}
+
+static int add_func_jump_tables(struct objtool_file *file,
+ struct symbol *func)
+{
+ struct instruction *insn;
+ int ret;
+
+ func_for_each_insn_all(file, func, insn) {
+ if (!insn->jump_table)
+ continue;
+
+ ret = add_jump_table(file, insn, insn->jump_table);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * For some switch statements, gcc generates a jump table in the .rodata
+ * section which contains a list of addresses within the function to jump to.
+ * This finds these jump tables and adds them to the insn->alts lists.
+ */
+static int add_jump_table_alts(struct objtool_file *file)
+{
+ struct section *sec;
+ struct symbol *func;
+ int ret;
+
+ if (!file->rodata)
+ return 0;
+
+ for_each_sec(file, sec) {
+ list_for_each_entry(func, &sec->symbol_list, list) {
+ if (func->type != STT_FUNC)
+ continue;
+
+ mark_func_jump_tables(file, func);
+ ret = add_func_jump_tables(file, func);
+ if (ret)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int read_unwind_hints(struct objtool_file *file)
+{
+ struct section *sec, *relasec;
+ struct rela *rela;
+ struct unwind_hint *hint;
+ struct instruction *insn;
+ struct cfi_reg *cfa;
+ int i;
+
+ sec = find_section_by_name(file->elf, ".discard.unwind_hints");
+ if (!sec)
+ return 0;
+
+ relasec = sec->rela;
+ if (!relasec) {
+ WARN("missing .rela.discard.unwind_hints section");
+ return -1;
+ }
+
+ if (sec->len % sizeof(struct unwind_hint)) {
+ WARN("struct unwind_hint size mismatch");
+ return -1;
+ }
+
+ file->hints = true;
+
+ for (i = 0; i < sec->len / sizeof(struct unwind_hint); i++) {
+ hint = (struct unwind_hint *)sec->data->d_buf + i;
+
+ rela = find_rela_by_dest(sec, i * sizeof(*hint));
+ if (!rela) {
+ WARN("can't find rela for unwind_hints[%d]", i);
+ return -1;
+ }
+
+ insn = find_insn(file, rela->sym->sec, rela->addend);
+ if (!insn) {
+ WARN("can't find insn for unwind_hints[%d]", i);
+ return -1;
+ }
+
+ cfa = &insn->state.cfa;
+
+ if (hint->type == UNWIND_HINT_TYPE_SAVE) {
+ insn->save = true;
+ continue;
+
+ } else if (hint->type == UNWIND_HINT_TYPE_RESTORE) {
+ insn->restore = true;
+ insn->hint = true;
+ continue;
+ }
+
+ insn->hint = true;
+
+ switch (hint->sp_reg) {
+ case ORC_REG_UNDEFINED:
+ cfa->base = CFI_UNDEFINED;
+ break;
+ case ORC_REG_SP:
+ cfa->base = CFI_SP;
+ break;
+ case ORC_REG_BP:
+ cfa->base = CFI_BP;
+ break;
+ case ORC_REG_SP_INDIRECT:
+ cfa->base = CFI_SP_INDIRECT;
+ break;
+ case ORC_REG_R10:
+ cfa->base = CFI_R10;
+ break;
+ case ORC_REG_R13:
+ cfa->base = CFI_R13;
+ break;
+ case ORC_REG_DI:
+ cfa->base = CFI_DI;
+ break;
+ case ORC_REG_DX:
+ cfa->base = CFI_DX;
+ break;
+ default:
+ WARN_FUNC("unsupported unwind_hint sp base reg %d",
+ insn->sec, insn->offset, hint->sp_reg);
+ return -1;
+ }
+
+ cfa->offset = hint->sp_offset;
+ insn->state.type = hint->type;
+ insn->state.end = hint->end;
+ }
+
+ return 0;
+}
+
+static int read_retpoline_hints(struct objtool_file *file)
+{
+ struct section *sec;
+ struct instruction *insn;
+ struct rela *rela;
+
+ sec = find_section_by_name(file->elf, ".rela.discard.retpoline_safe");
+ if (!sec)
+ return 0;
+
+ list_for_each_entry(rela, &sec->rela_list, list) {
+ if (rela->sym->type != STT_SECTION) {
+ WARN("unexpected relocation symbol type in %s", sec->name);
+ return -1;
+ }
+
+ insn = find_insn(file, rela->sym->sec, rela->addend);
+ if (!insn) {
+ WARN("bad .discard.retpoline_safe entry");
+ return -1;
+ }
+
+ if (insn->type != INSN_JUMP_DYNAMIC &&
+ insn->type != INSN_CALL_DYNAMIC) {
+ WARN_FUNC("retpoline_safe hint not an indirect jump/call",
+ insn->sec, insn->offset);
+ return -1;
+ }
+
+ insn->retpoline_safe = true;
+ }
+
+ return 0;
+}
+
+
+static int read_intra_function_calls(struct objtool_file *file)
+{
+ struct instruction *insn;
+ struct section *sec;
+ struct rela *rela;
+
+ sec = find_section_by_name(file->elf, ".rela.discard.intra_function_calls");
+ if (!sec)
+ return 0;
+
+ list_for_each_entry(rela, &sec->rela_list, list) {
+ unsigned long dest_off;
+
+ if (rela->sym->type != STT_SECTION) {
+ WARN("unexpected relocation symbol type in %s",
+ sec->name);
+ return -1;
+ }
+
+ insn = find_insn(file, rela->sym->sec, rela->addend);
+ if (!insn) {
+ WARN("bad .discard.intra_function_call entry");
+ return -1;
+ }
+
+ if (insn->type != INSN_CALL) {
+ WARN_FUNC("intra_function_call not a direct call",
+ insn->sec, insn->offset);
+ return -1;
+ }
+
+ /*
+ * Treat intra-function CALLs as JMPs, but with a stack_op.
+ * See add_call_destinations(), which strips stack_ops from
+ * normal CALLs.
+ */
+ insn->type = INSN_JUMP_UNCONDITIONAL;
+
+ dest_off = insn->offset + insn->len + insn->immediate;
+ insn->jump_dest = find_insn(file, insn->sec, dest_off);
+ if (!insn->jump_dest) {
+ WARN_FUNC("can't find call dest at %s+0x%lx",
+ insn->sec, insn->offset,
+ insn->sec->name, dest_off);
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static void mark_rodata(struct objtool_file *file)
+{
+ struct section *sec;
+ bool found = false;
+
+ /*
+ * Search for the following rodata sections, each of which can
+ * potentially contain jump tables:
+ *
+ * - .rodata: can contain GCC switch tables
+ * - .rodata.<func>: same, if -fdata-sections is being used
+ * - .rodata..c_jump_table: contains C annotated jump tables
+ *
+ * .rodata.str1.* sections are ignored; they don't contain jump tables.
+ */
+ for_each_sec(file, sec) {
+ if ((!strncmp(sec->name, ".rodata", 7) && !strstr(sec->name, ".str1.")) ||
+ !strcmp(sec->name, C_JUMP_TABLE_SECTION)) {
+ sec->rodata = true;
+ found = true;
+ }
+ }
+
+ file->rodata = found;
+}
+
+static int decode_sections(struct objtool_file *file)
+{
+ int ret;
+
+ mark_rodata(file);
+
+ ret = decode_instructions(file);
+ if (ret)
+ return ret;
+
+ ret = add_dead_ends(file);
+ if (ret)
+ return ret;
+
+ add_ignores(file);
+ add_uaccess_safe(file);
+
+ ret = add_ignore_alternatives(file);
+ if (ret)
+ return ret;
+
+ ret = add_jump_destinations(file);
+ if (ret)
+ return ret;
+
+ ret = add_special_section_alts(file);
+ if (ret)
+ return ret;
+
+ ret = read_intra_function_calls(file);
+ if (ret)
+ return ret;
+
+ ret = add_call_destinations(file);
+ if (ret)
+ return ret;
+
+ ret = add_jump_table_alts(file);
+ if (ret)
+ return ret;
+
+ ret = read_unwind_hints(file);
+ if (ret)
+ return ret;
+
+ ret = read_retpoline_hints(file);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static bool is_fentry_call(struct instruction *insn)
+{
+ if (insn->type == INSN_CALL && insn->call_dest &&
+ insn->call_dest->type == STT_NOTYPE &&
+ !strcmp(insn->call_dest->name, "__fentry__"))
+ return true;
+
+ return false;
+}
+
+static bool has_modified_stack_frame(struct insn_state *state)
+{
+ int i;
+
+ if (state->cfa.base != initial_func_cfi.cfa.base ||
+ state->cfa.offset != initial_func_cfi.cfa.offset ||
+ state->stack_size != initial_func_cfi.cfa.offset ||
+ state->drap)
+ return true;
+
+ for (i = 0; i < CFI_NUM_REGS; i++)
+ if (state->regs[i].base != initial_func_cfi.regs[i].base ||
+ state->regs[i].offset != initial_func_cfi.regs[i].offset)
+ return true;
+
+ return false;
+}
+
+static bool has_valid_stack_frame(struct insn_state *state)
+{
+ if (state->cfa.base == CFI_BP && state->regs[CFI_BP].base == CFI_CFA &&
+ state->regs[CFI_BP].offset == -16)
+ return true;
+
+ if (state->drap && state->regs[CFI_BP].base == CFI_BP)
+ return true;
+
+ return false;
+}
+
+static int update_insn_state_regs(struct instruction *insn, struct insn_state *state)
+{
+ struct cfi_reg *cfa = &state->cfa;
+ struct stack_op *op = &insn->stack_op;
+
+ if (cfa->base != CFI_SP && cfa->base != CFI_SP_INDIRECT)
+ return 0;
+
+ /* push */
+ if (op->dest.type == OP_DEST_PUSH || op->dest.type == OP_DEST_PUSHF)
+ cfa->offset += 8;
+
+ /* pop */
+ if (op->src.type == OP_SRC_POP || op->src.type == OP_SRC_POPF)
+ cfa->offset -= 8;
+
+ /* add immediate to sp */
+ if (op->dest.type == OP_DEST_REG && op->src.type == OP_SRC_ADD &&
+ op->dest.reg == CFI_SP && op->src.reg == CFI_SP)
+ cfa->offset -= op->src.offset;
+
+ return 0;
+}
+
+static void save_reg(struct insn_state *state, unsigned char reg, int base,
+ int offset)
+{
+ if (arch_callee_saved_reg(reg) &&
+ state->regs[reg].base == CFI_UNDEFINED) {
+ state->regs[reg].base = base;
+ state->regs[reg].offset = offset;
+ }
+}
+
+static void restore_reg(struct insn_state *state, unsigned char reg)
+{
+ state->regs[reg].base = CFI_UNDEFINED;
+ state->regs[reg].offset = 0;
+}
+
+/*
+ * A note about DRAP stack alignment:
+ *
+ * GCC has the concept of a DRAP register, which is used to help keep track of
+ * the stack pointer when aligning the stack. r10 or r13 is used as the DRAP
+ * register. The typical DRAP pattern is:
+ *
+ * 4c 8d 54 24 08 lea 0x8(%rsp),%r10
+ * 48 83 e4 c0 and $0xffffffffffffffc0,%rsp
+ * 41 ff 72 f8 pushq -0x8(%r10)
+ * 55 push %rbp
+ * 48 89 e5 mov %rsp,%rbp
+ * (more pushes)
+ * 41 52 push %r10
+ * ...
+ * 41 5a pop %r10
+ * (more pops)
+ * 5d pop %rbp
+ * 49 8d 62 f8 lea -0x8(%r10),%rsp
+ * c3 retq
+ *
+ * There are some variations in the epilogues, like:
+ *
+ * 5b pop %rbx
+ * 41 5a pop %r10
+ * 41 5c pop %r12
+ * 41 5d pop %r13
+ * 41 5e pop %r14
+ * c9 leaveq
+ * 49 8d 62 f8 lea -0x8(%r10),%rsp
+ * c3 retq
+ *
+ * and:
+ *
+ * 4c 8b 55 e8 mov -0x18(%rbp),%r10
+ * 48 8b 5d e0 mov -0x20(%rbp),%rbx
+ * 4c 8b 65 f0 mov -0x10(%rbp),%r12
+ * 4c 8b 6d f8 mov -0x8(%rbp),%r13
+ * c9 leaveq
+ * 49 8d 62 f8 lea -0x8(%r10),%rsp
+ * c3 retq
+ *
+ * Sometimes r13 is used as the DRAP register, in which case it's saved and
+ * restored beforehand:
+ *
+ * 41 55 push %r13
+ * 4c 8d 6c 24 10 lea 0x10(%rsp),%r13
+ * 48 83 e4 f0 and $0xfffffffffffffff0,%rsp
+ * ...
+ * 49 8d 65 f0 lea -0x10(%r13),%rsp
+ * 41 5d pop %r13
+ * c3 retq
+ */
+static int update_insn_state(struct instruction *insn, struct insn_state *state)
+{
+ struct stack_op *op = &insn->stack_op;
+ struct cfi_reg *cfa = &state->cfa;
+ struct cfi_reg *regs = state->regs;
+
+ /* stack operations don't make sense with an undefined CFA */
+ if (cfa->base == CFI_UNDEFINED) {
+ if (insn->func) {
+ WARN_FUNC("undefined stack state", insn->sec, insn->offset);
+ return -1;
+ }
+ return 0;
+ }
+
+ if (state->type == ORC_TYPE_REGS || state->type == ORC_TYPE_REGS_IRET)
+ return update_insn_state_regs(insn, state);
+
+ switch (op->dest.type) {
+
+ case OP_DEST_REG:
+ switch (op->src.type) {
+
+ case OP_SRC_REG:
+ if (op->src.reg == CFI_SP && op->dest.reg == CFI_BP &&
+ cfa->base == CFI_SP &&
+ regs[CFI_BP].base == CFI_CFA &&
+ regs[CFI_BP].offset == -cfa->offset) {
+
+ /* mov %rsp, %rbp */
+ cfa->base = op->dest.reg;
+ state->bp_scratch = false;
+ }
+
+ else if (op->src.reg == CFI_SP &&
+ op->dest.reg == CFI_BP && state->drap) {
+
+ /* drap: mov %rsp, %rbp */
+ regs[CFI_BP].base = CFI_BP;
+ regs[CFI_BP].offset = -state->stack_size;
+ state->bp_scratch = false;
+ }
+
+ else if (op->src.reg == CFI_SP && cfa->base == CFI_SP) {
+
+ /*
+ * mov %rsp, %reg
+ *
+ * This is needed for the rare case where GCC
+ * does:
+ *
+ * mov %rsp, %rax
+ * ...
+ * mov %rax, %rsp
+ */
+ state->vals[op->dest.reg].base = CFI_CFA;
+ state->vals[op->dest.reg].offset = -state->stack_size;
+ }
+
+ else if (op->src.reg == CFI_BP && op->dest.reg == CFI_SP &&
+ cfa->base == CFI_BP) {
+
+ /*
+ * mov %rbp, %rsp
+ *
+ * Restore the original stack pointer (Clang).
+ */
+ state->stack_size = -state->regs[CFI_BP].offset;
+ }
+
+ else if (op->dest.reg == cfa->base) {
+
+ /* mov %reg, %rsp */
+ if (cfa->base == CFI_SP &&
+ state->vals[op->src.reg].base == CFI_CFA) {
+
+ /*
+ * This is needed for the rare case
+ * where GCC does something dumb like:
+ *
+ * lea 0x8(%rsp), %rcx
+ * ...
+ * mov %rcx, %rsp
+ */
+ cfa->offset = -state->vals[op->src.reg].offset;
+ state->stack_size = cfa->offset;
+
+ } else {
+ cfa->base = CFI_UNDEFINED;
+ cfa->offset = 0;
+ }
+ }
+
+ break;
+
+ case OP_SRC_ADD:
+ if (op->dest.reg == CFI_SP && op->src.reg == CFI_SP) {
+
+ /* add imm, %rsp */
+ state->stack_size -= op->src.offset;
+ if (cfa->base == CFI_SP)
+ cfa->offset -= op->src.offset;
+ break;
+ }
+
+ if (op->dest.reg == CFI_SP && op->src.reg == CFI_BP) {
+
+ /* lea disp(%rbp), %rsp */
+ state->stack_size = -(op->src.offset + regs[CFI_BP].offset);
+ break;
+ }
+
+ if (op->src.reg == CFI_SP && cfa->base == CFI_SP) {
+
+ /* drap: lea disp(%rsp), %drap */
+ state->drap_reg = op->dest.reg;
+
+ /*
+ * lea disp(%rsp), %reg
+ *
+ * This is needed for the rare case where GCC
+ * does something dumb like:
+ *
+ * lea 0x8(%rsp), %rcx
+ * ...
+ * mov %rcx, %rsp
+ */
+ state->vals[op->dest.reg].base = CFI_CFA;
+ state->vals[op->dest.reg].offset = \
+ -state->stack_size + op->src.offset;
+
+ break;
+ }
+
+ if (state->drap && op->dest.reg == CFI_SP &&
+ op->src.reg == state->drap_reg) {
+
+ /* drap: lea disp(%drap), %rsp */
+ cfa->base = CFI_SP;
+ cfa->offset = state->stack_size = -op->src.offset;
+ state->drap_reg = CFI_UNDEFINED;
+ state->drap = false;
+ break;
+ }
+
+ if (op->dest.reg == state->cfa.base) {
+ WARN_FUNC("unsupported stack register modification",
+ insn->sec, insn->offset);
+ return -1;
+ }
+
+ break;
+
+ case OP_SRC_AND:
+ if (op->dest.reg != CFI_SP ||
+ (state->drap_reg != CFI_UNDEFINED && cfa->base != CFI_SP) ||
+ (state->drap_reg == CFI_UNDEFINED && cfa->base != CFI_BP)) {
+ WARN_FUNC("unsupported stack pointer realignment",
+ insn->sec, insn->offset);
+ return -1;
+ }
+
+ if (state->drap_reg != CFI_UNDEFINED) {
+ /* drap: and imm, %rsp */
+ cfa->base = state->drap_reg;
+ cfa->offset = state->stack_size = 0;
+ state->drap = true;
+ }
+
+ /*
+ * Older versions of GCC (4.8ish) realign the stack
+ * without DRAP, with a frame pointer.
+ */
+
+ break;
+
+ case OP_SRC_POP:
+ case OP_SRC_POPF:
+ if (!state->drap && op->dest.type == OP_DEST_REG &&
+ op->dest.reg == cfa->base) {
+
+ /* pop %rbp */
+ cfa->base = CFI_SP;
+ }
+
+ if (state->drap && cfa->base == CFI_BP_INDIRECT &&
+ op->dest.type == OP_DEST_REG &&
+ op->dest.reg == state->drap_reg &&
+ state->drap_offset == -state->stack_size) {
+
+ /* drap: pop %drap */
+ cfa->base = state->drap_reg;
+ cfa->offset = 0;
+ state->drap_offset = -1;
+
+ } else if (regs[op->dest.reg].offset == -state->stack_size) {
+
+ /* pop %reg */
+ restore_reg(state, op->dest.reg);
+ }
+
+ state->stack_size -= 8;
+ if (cfa->base == CFI_SP)
+ cfa->offset -= 8;
+
+ break;
+
+ case OP_SRC_REG_INDIRECT:
+ if (state->drap && op->src.reg == CFI_BP &&
+ op->src.offset == state->drap_offset) {
+
+ /* drap: mov disp(%rbp), %drap */
+ cfa->base = state->drap_reg;
+ cfa->offset = 0;
+ state->drap_offset = -1;
+ }
+
+ if (state->drap && op->src.reg == CFI_BP &&
+ op->src.offset == regs[op->dest.reg].offset) {
+
+ /* drap: mov disp(%rbp), %reg */
+ restore_reg(state, op->dest.reg);
+
+ } else if (op->src.reg == cfa->base &&
+ op->src.offset == regs[op->dest.reg].offset + cfa->offset) {
+
+ /* mov disp(%rbp), %reg */
+ /* mov disp(%rsp), %reg */
+ restore_reg(state, op->dest.reg);
+ }
+
+ break;
+
+ default:
+ WARN_FUNC("unknown stack-related instruction",
+ insn->sec, insn->offset);
+ return -1;
+ }
+
+ break;
+
+ case OP_DEST_PUSH:
+ case OP_DEST_PUSHF:
+ state->stack_size += 8;
+ if (cfa->base == CFI_SP)
+ cfa->offset += 8;
+
+ if (op->src.type != OP_SRC_REG)
+ break;
+
+ if (state->drap) {
+ if (op->src.reg == cfa->base && op->src.reg == state->drap_reg) {
+
+ /* drap: push %drap */
+ cfa->base = CFI_BP_INDIRECT;
+ cfa->offset = -state->stack_size;
+
+ /* save drap so we know when to restore it */
+ state->drap_offset = -state->stack_size;
+
+ } else if (op->src.reg == CFI_BP && cfa->base == state->drap_reg) {
+
+ /* drap: push %rbp */
+ state->stack_size = 0;
+
+ } else if (regs[op->src.reg].base == CFI_UNDEFINED) {
+
+ /* drap: push %reg */
+ save_reg(state, op->src.reg, CFI_BP, -state->stack_size);
+ }
+
+ } else {
+
+ /* push %reg */
+ save_reg(state, op->src.reg, CFI_CFA, -state->stack_size);
+ }
+
+ /* detect when asm code uses rbp as a scratch register */
+ if (!no_fp && insn->func && op->src.reg == CFI_BP &&
+ cfa->base != CFI_BP)
+ state->bp_scratch = true;
+ break;
+
+ case OP_DEST_REG_INDIRECT:
+
+ if (state->drap) {
+ if (op->src.reg == cfa->base && op->src.reg == state->drap_reg) {
+
+ /* drap: mov %drap, disp(%rbp) */
+ cfa->base = CFI_BP_INDIRECT;
+ cfa->offset = op->dest.offset;
+
+ /* save drap offset so we know when to restore it */
+ state->drap_offset = op->dest.offset;
+ }
+
+ else if (regs[op->src.reg].base == CFI_UNDEFINED) {
+
+ /* drap: mov reg, disp(%rbp) */
+ save_reg(state, op->src.reg, CFI_BP, op->dest.offset);
+ }
+
+ } else if (op->dest.reg == cfa->base) {
+
+ /* mov reg, disp(%rbp) */
+ /* mov reg, disp(%rsp) */
+ save_reg(state, op->src.reg, CFI_CFA,
+ op->dest.offset - state->cfa.offset);
+ }
+
+ break;
+
+ case OP_DEST_LEAVE:
+ if ((!state->drap && cfa->base != CFI_BP) ||
+ (state->drap && cfa->base != state->drap_reg)) {
+ WARN_FUNC("leave instruction with modified stack frame",
+ insn->sec, insn->offset);
+ return -1;
+ }
+
+ /* leave (mov %rbp, %rsp; pop %rbp) */
+
+ state->stack_size = -state->regs[CFI_BP].offset - 8;
+ restore_reg(state, CFI_BP);
+
+ if (!state->drap) {
+ cfa->base = CFI_SP;
+ cfa->offset -= 8;
+ }
+
+ break;
+
+ case OP_DEST_MEM:
+ if (op->src.type != OP_SRC_POP && op->src.type != OP_SRC_POPF) {
+ WARN_FUNC("unknown stack-related memory operation",
+ insn->sec, insn->offset);
+ return -1;
+ }
+
+ /* pop mem */
+ state->stack_size -= 8;
+ if (cfa->base == CFI_SP)
+ cfa->offset -= 8;
+
+ break;
+
+ default:
+ WARN_FUNC("unknown stack-related instruction",
+ insn->sec, insn->offset);
+ return -1;
+ }
+
+ return 0;
+}
+
+static bool insn_state_match(struct instruction *insn, struct insn_state *state)
+{
+ struct insn_state *state1 = &insn->state, *state2 = state;
+ int i;
+
+ if (memcmp(&state1->cfa, &state2->cfa, sizeof(state1->cfa))) {
+ WARN_FUNC("stack state mismatch: cfa1=%d%+d cfa2=%d%+d",
+ insn->sec, insn->offset,
+ state1->cfa.base, state1->cfa.offset,
+ state2->cfa.base, state2->cfa.offset);
+
+ } else if (memcmp(&state1->regs, &state2->regs, sizeof(state1->regs))) {
+ for (i = 0; i < CFI_NUM_REGS; i++) {
+ if (!memcmp(&state1->regs[i], &state2->regs[i],
+ sizeof(struct cfi_reg)))
+ continue;
+
+ WARN_FUNC("stack state mismatch: reg1[%d]=%d%+d reg2[%d]=%d%+d",
+ insn->sec, insn->offset,
+ i, state1->regs[i].base, state1->regs[i].offset,
+ i, state2->regs[i].base, state2->regs[i].offset);
+ break;
+ }
+
+ } else if (state1->type != state2->type) {
+ WARN_FUNC("stack state mismatch: type1=%d type2=%d",
+ insn->sec, insn->offset, state1->type, state2->type);
+
+ } else if (state1->drap != state2->drap ||
+ (state1->drap && state1->drap_reg != state2->drap_reg) ||
+ (state1->drap && state1->drap_offset != state2->drap_offset)) {
+ WARN_FUNC("stack state mismatch: drap1=%d(%d,%d) drap2=%d(%d,%d)",
+ insn->sec, insn->offset,
+ state1->drap, state1->drap_reg, state1->drap_offset,
+ state2->drap, state2->drap_reg, state2->drap_offset);
+
+ } else
+ return true;
+
+ return false;
+}
+
+static inline bool func_uaccess_safe(struct symbol *func)
+{
+ if (func)
+ return func->uaccess_safe;
+
+ return false;
+}
+
+static inline const char *call_dest_name(struct instruction *insn)
+{
+ if (insn->call_dest)
+ return insn->call_dest->name;
+
+ return "{dynamic}";
+}
+
+static int validate_call(struct instruction *insn, struct insn_state *state)
+{
+ if (state->uaccess && !func_uaccess_safe(insn->call_dest)) {
+ WARN_FUNC("call to %s() with UACCESS enabled",
+ insn->sec, insn->offset, call_dest_name(insn));
+ return 1;
+ }
+
+ if (state->df) {
+ WARN_FUNC("call to %s() with DF set",
+ insn->sec, insn->offset, call_dest_name(insn));
+ return 1;
+ }
+
+ return 0;
+}
+
+static int validate_sibling_call(struct instruction *insn, struct insn_state *state)
+{
+ if (has_modified_stack_frame(state)) {
+ WARN_FUNC("sibling call from callable instruction with modified stack frame",
+ insn->sec, insn->offset);
+ return 1;
+ }
+
+ return validate_call(insn, state);
+}
+
+/*
+ * Follow the branch starting at the given instruction, and recursively follow
+ * any other branches (jumps). Meanwhile, track the frame pointer state at
+ * each instruction and validate all the rules described in
+ * tools/objtool/Documentation/stack-validation.txt.
+ */
+static int validate_branch(struct objtool_file *file, struct symbol *func,
+ struct instruction *first, struct insn_state state)
+{
+ struct alternative *alt;
+ struct instruction *insn, *next_insn;
+ struct section *sec;
+ u8 visited;
+ int ret;
+
+ insn = first;
+ sec = insn->sec;
+
+ if (insn->alt_group && list_empty(&insn->alts)) {
+ WARN_FUNC("don't know how to handle branch to middle of alternative instruction group",
+ sec, insn->offset);
+ return 1;
+ }
+
+ while (1) {
+ next_insn = next_insn_same_sec(file, insn);
+
+ if (file->c_file && func && insn->func && func != insn->func->pfunc) {
+ WARN("%s() falls through to next function %s()",
+ func->name, insn->func->name);
+ return 1;
+ }
+
+ if (func && insn->ignore) {
+ WARN_FUNC("BUG: why am I validating an ignored function?",
+ sec, insn->offset);
+ return 1;
+ }
+
+ visited = 1 << state.uaccess;
+ if (insn->visited) {
+ if (!insn->hint && !insn_state_match(insn, &state))
+ return 1;
+
+ if (insn->visited & visited)
+ return 0;
+ }
+
+ if (insn->hint) {
+ if (insn->restore) {
+ struct instruction *save_insn, *i;
+
+ i = insn;
+ save_insn = NULL;
+ func_for_each_insn_continue_reverse(file, func, i) {
+ if (i->save) {
+ save_insn = i;
+ break;
+ }
+ }
+
+ if (!save_insn) {
+ WARN_FUNC("no corresponding CFI save for CFI restore",
+ sec, insn->offset);
+ return 1;
+ }
+
+ if (!save_insn->visited) {
+ /*
+ * Oops, no state to copy yet.
+ * Hopefully we can reach this
+ * instruction from another branch
+ * after the save insn has been
+ * visited.
+ */
+ if (insn == first)
+ return 0;
+
+ WARN_FUNC("objtool isn't smart enough to handle this CFI save/restore combo",
+ sec, insn->offset);
+ return 1;
+ }
+
+ insn->state = save_insn->state;
+ }
+
+ state = insn->state;
+
+ } else
+ insn->state = state;
+
+ insn->visited |= visited;
+
+ if (!insn->ignore_alts) {
+ bool skip_orig = false;
+
+ list_for_each_entry(alt, &insn->alts, list) {
+ if (alt->skip_orig)
+ skip_orig = true;
+
+ ret = validate_branch(file, func, alt->insn, state);
+ if (ret) {
+ if (backtrace)
+ BT_FUNC("(alt)", insn);
+ return ret;
+ }
+ }
+
+ if (skip_orig)
+ return 0;
+ }
+
+ switch (insn->type) {
+
+ case INSN_RETURN:
+ if (state.uaccess && !func_uaccess_safe(func)) {
+ WARN_FUNC("return with UACCESS enabled", sec, insn->offset);
+ return 1;
+ }
+
+ if (!state.uaccess && func_uaccess_safe(func)) {
+ WARN_FUNC("return with UACCESS disabled from a UACCESS-safe function", sec, insn->offset);
+ return 1;
+ }
+
+ if (state.df) {
+ WARN_FUNC("return with DF set", sec, insn->offset);
+ return 1;
+ }
+
+ if (func && has_modified_stack_frame(&state)) {
+ WARN_FUNC("return with modified stack frame",
+ sec, insn->offset);
+ return 1;
+ }
+
+ if (state.bp_scratch) {
+ WARN("%s uses BP as a scratch register",
+ func->name);
+ return 1;
+ }
+
+ return 0;
+
+ case INSN_CALL:
+ case INSN_CALL_DYNAMIC:
+ ret = validate_call(insn, &state);
+ if (ret)
+ return ret;
+
+ if (!no_fp && func && !is_fentry_call(insn) &&
+ !has_valid_stack_frame(&state)) {
+ WARN_FUNC("call without frame pointer save/setup",
+ sec, insn->offset);
+ return 1;
+ }
+
+ if (dead_end_function(file, insn->call_dest))
+ return 0;
+
+ break;
+
+ case INSN_JUMP_CONDITIONAL:
+ case INSN_JUMP_UNCONDITIONAL:
+ if (func && is_sibling_call(insn)) {
+ ret = validate_sibling_call(insn, &state);
+ if (ret)
+ return ret;
+
+ } else if (insn->jump_dest) {
+ ret = validate_branch(file, func,
+ insn->jump_dest, state);
+ if (ret) {
+ if (backtrace)
+ BT_FUNC("(branch)", insn);
+ return ret;
+ }
+ }
+
+ if (insn->type == INSN_JUMP_UNCONDITIONAL)
+ return 0;
+
+ break;
+
+ case INSN_JUMP_DYNAMIC:
+ case INSN_JUMP_DYNAMIC_CONDITIONAL:
+ if (func && is_sibling_call(insn)) {
+ ret = validate_sibling_call(insn, &state);
+ if (ret)
+ return ret;
+ }
+
+ if (insn->type == INSN_JUMP_DYNAMIC)
+ return 0;
+
+ break;
+
+ case INSN_CONTEXT_SWITCH:
+ if (func && (!next_insn || !next_insn->hint)) {
+ WARN_FUNC("unsupported instruction in callable function",
+ sec, insn->offset);
+ return 1;
+ }
+ return 0;
+
+ case INSN_STACK:
+ if (update_insn_state(insn, &state))
+ return 1;
+
+ if (insn->stack_op.dest.type == OP_DEST_PUSHF) {
+ if (!state.uaccess_stack) {
+ state.uaccess_stack = 1;
+ } else if (state.uaccess_stack >> 31) {
+ WARN_FUNC("PUSHF stack exhausted", sec, insn->offset);
+ return 1;
+ }
+ state.uaccess_stack <<= 1;
+ state.uaccess_stack |= state.uaccess;
+ }
+
+ if (insn->stack_op.src.type == OP_SRC_POPF) {
+ if (state.uaccess_stack) {
+ state.uaccess = state.uaccess_stack & 1;
+ state.uaccess_stack >>= 1;
+ if (state.uaccess_stack == 1)
+ state.uaccess_stack = 0;
+ }
+ }
+
+ break;
+
+ case INSN_STAC:
+ if (state.uaccess) {
+ WARN_FUNC("recursive UACCESS enable", sec, insn->offset);
+ return 1;
+ }
+
+ state.uaccess = true;
+ break;
+
+ case INSN_CLAC:
+ if (!state.uaccess && func) {
+ WARN_FUNC("redundant UACCESS disable", sec, insn->offset);
+ return 1;
+ }
+
+ if (func_uaccess_safe(func) && !state.uaccess_stack) {
+ WARN_FUNC("UACCESS-safe disables UACCESS", sec, insn->offset);
+ return 1;
+ }
+
+ state.uaccess = false;
+ break;
+
+ case INSN_STD:
+ if (state.df) {
+ WARN_FUNC("recursive STD", sec, insn->offset);
+ return 1;
+ }
+
+ state.df = true;
+ break;
+
+ case INSN_CLD:
+ if (!state.df && func) {
+ WARN_FUNC("redundant CLD", sec, insn->offset);
+ return 1;
+ }
+
+ state.df = false;
+ break;
+
+ default:
+ break;
+ }
+
+ if (insn->dead_end)
+ return 0;
+
+ if (!next_insn) {
+ if (state.cfa.base == CFI_UNDEFINED)
+ return 0;
+ WARN("%s: unexpected end of section", sec->name);
+ return 1;
+ }
+
+ insn = next_insn;
+ }
+
+ return 0;
+}
+
+static int validate_unwind_hints(struct objtool_file *file)
+{
+ struct instruction *insn;
+ int ret, warnings = 0;
+ struct insn_state state;
+
+ if (!file->hints)
+ return 0;
+
+ clear_insn_state(&state);
+
+ for_each_insn(file, insn) {
+ if (insn->hint && !insn->visited) {
+ ret = validate_branch(file, insn->func, insn, state);
+ if (ret && backtrace)
+ BT_FUNC("<=== (hint)", insn);
+ warnings += ret;
+ }
+ }
+
+ return warnings;
+}
+
+static int validate_retpoline(struct objtool_file *file)
+{
+ struct instruction *insn;
+ int warnings = 0;
+
+ for_each_insn(file, insn) {
+ if (insn->type != INSN_JUMP_DYNAMIC &&
+ insn->type != INSN_CALL_DYNAMIC)
+ continue;
+
+ if (insn->retpoline_safe)
+ continue;
+
+ /*
+ * .init.text code is ran before userspace and thus doesn't
+ * strictly need retpolines, except for modules which are
+ * loaded late, they very much do need retpoline in their
+ * .init.text
+ */
+ if (!strcmp(insn->sec->name, ".init.text") && !module)
+ continue;
+
+ WARN_FUNC("indirect %s found in RETPOLINE build",
+ insn->sec, insn->offset,
+ insn->type == INSN_JUMP_DYNAMIC ? "jump" : "call");
+
+ warnings++;
+ }
+
+ return warnings;
+}
+
+static bool is_kasan_insn(struct instruction *insn)
+{
+ return (insn->type == INSN_CALL &&
+ !strcmp(insn->call_dest->name, "__asan_handle_no_return"));
+}
+
+static bool is_ubsan_insn(struct instruction *insn)
+{
+ return (insn->type == INSN_CALL &&
+ !strcmp(insn->call_dest->name,
+ "__ubsan_handle_builtin_unreachable"));
+}
+
+static bool ignore_unreachable_insn(struct instruction *insn)
+{
+ int i;
+
+ if (insn->ignore || insn->type == INSN_NOP)
+ return true;
+
+ /*
+ * Ignore any unused exceptions. This can happen when a whitelisted
+ * function has an exception table entry.
+ *
+ * Also ignore alternative replacement instructions. This can happen
+ * when a whitelisted function uses one of the ALTERNATIVE macros.
+ */
+ if (!strcmp(insn->sec->name, ".fixup") ||
+ !strcmp(insn->sec->name, ".altinstr_replacement") ||
+ !strcmp(insn->sec->name, ".altinstr_aux"))
+ return true;
+
+ if (!insn->func)
+ return false;
+
+ /*
+ * CONFIG_UBSAN_TRAP inserts a UD2 when it sees
+ * __builtin_unreachable(). The BUG() macro has an unreachable() after
+ * the UD2, which causes GCC's undefined trap logic to emit another UD2
+ * (or occasionally a JMP to UD2).
+ */
+ if (list_prev_entry(insn, list)->dead_end &&
+ (insn->type == INSN_BUG ||
+ (insn->type == INSN_JUMP_UNCONDITIONAL &&
+ insn->jump_dest && insn->jump_dest->type == INSN_BUG)))
+ return true;
+
+ /*
+ * Check if this (or a subsequent) instruction is related to
+ * CONFIG_UBSAN or CONFIG_KASAN.
+ *
+ * End the search at 5 instructions to avoid going into the weeds.
+ */
+ for (i = 0; i < 5; i++) {
+
+ if (is_kasan_insn(insn) || is_ubsan_insn(insn))
+ return true;
+
+ if (insn->type == INSN_JUMP_UNCONDITIONAL) {
+ if (insn->jump_dest &&
+ insn->jump_dest->func == insn->func) {
+ insn = insn->jump_dest;
+ continue;
+ }
+
+ break;
+ }
+
+ if (insn->offset + insn->len >= insn->func->offset + insn->func->len)
+ break;
+
+ insn = list_next_entry(insn, list);
+ }
+
+ return false;
+}
+
+static int validate_functions(struct objtool_file *file)
+{
+ struct section *sec;
+ struct symbol *func;
+ struct instruction *insn;
+ struct insn_state state;
+ int ret, warnings = 0;
+
+ clear_insn_state(&state);
+
+ state.cfa = initial_func_cfi.cfa;
+ memcpy(&state.regs, &initial_func_cfi.regs,
+ CFI_NUM_REGS * sizeof(struct cfi_reg));
+ state.stack_size = initial_func_cfi.cfa.offset;
+
+ for_each_sec(file, sec) {
+ list_for_each_entry(func, &sec->symbol_list, list) {
+ if (func->type != STT_FUNC)
+ continue;
+
+ if (!func->len) {
+ WARN("%s() is missing an ELF size annotation",
+ func->name);
+ warnings++;
+ }
+
+ if (func->pfunc != func || func->alias != func)
+ continue;
+
+ insn = find_insn(file, sec, func->offset);
+ if (!insn || insn->ignore || insn->visited)
+ continue;
+
+ state.uaccess = func->uaccess_safe;
+
+ ret = validate_branch(file, func, insn, state);
+ if (ret && backtrace)
+ BT_FUNC("<=== (func)", insn);
+ warnings += ret;
+ }
+ }
+
+ return warnings;
+}
+
+static int validate_reachable_instructions(struct objtool_file *file)
+{
+ struct instruction *insn;
+
+ if (file->ignore_unreachables)
+ return 0;
+
+ for_each_insn(file, insn) {
+ if (insn->visited || ignore_unreachable_insn(insn))
+ continue;
+
+ WARN_FUNC("unreachable instruction", insn->sec, insn->offset);
+ return 1;
+ }
+
+ return 0;
+}
+
+static void cleanup(struct objtool_file *file)
+{
+ struct instruction *insn, *tmpinsn;
+ struct alternative *alt, *tmpalt;
+
+ list_for_each_entry_safe(insn, tmpinsn, &file->insn_list, list) {
+ list_for_each_entry_safe(alt, tmpalt, &insn->alts, list) {
+ list_del(&alt->list);
+ free(alt);
+ }
+ list_del(&insn->list);
+ hash_del(&insn->hash);
+ free(insn);
+ }
+ elf_close(file->elf);
+}
+
+static struct objtool_file file;
+
+int check(const char *_objname, bool orc)
+{
+ int ret, warnings = 0;
+
+ objname = _objname;
+
+ file.elf = elf_read(objname, orc ? O_RDWR : O_RDONLY);
+ if (!file.elf)
+ return 1;
+
+ INIT_LIST_HEAD(&file.insn_list);
+ hash_init(file.insn_hash);
+ file.c_file = find_section_by_name(file.elf, ".comment");
+ file.ignore_unreachables = no_unreachable;
+ file.hints = false;
+
+ arch_initial_func_cfi_state(&initial_func_cfi);
+
+ ret = decode_sections(&file);
+ if (ret < 0)
+ goto out;
+ warnings += ret;
+
+ if (list_empty(&file.insn_list))
+ goto out;
+
+ if (retpoline) {
+ ret = validate_retpoline(&file);
+ if (ret < 0)
+ return ret;
+ warnings += ret;
+ }
+
+ ret = validate_functions(&file);
+ if (ret < 0)
+ goto out;
+ warnings += ret;
+
+ ret = validate_unwind_hints(&file);
+ if (ret < 0)
+ goto out;
+ warnings += ret;
+
+ if (!warnings) {
+ ret = validate_reachable_instructions(&file);
+ if (ret < 0)
+ goto out;
+ warnings += ret;
+ }
+
+ if (orc) {
+ ret = create_orc(&file);
+ if (ret < 0)
+ goto out;
+
+ ret = create_orc_sections(&file);
+ if (ret < 0)
+ goto out;
+
+ ret = elf_write(file.elf);
+ if (ret < 0)
+ goto out;
+ }
+
+out:
+ cleanup(&file);
+
+ /* ignore warnings for now until we get all the code cleaned up */
+ if (ret || warnings)
+ return 0;
+ return 0;
+}
diff --git a/marvell/linux/tools/objtool/check.h b/marvell/linux/tools/objtool/check.h
new file mode 100644
index 0000000..6d875ca
--- /dev/null
+++ b/marvell/linux/tools/objtool/check.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+#ifndef _CHECK_H
+#define _CHECK_H
+
+#include <stdbool.h>
+#include "elf.h"
+#include "cfi.h"
+#include "arch.h"
+#include "orc.h"
+#include <linux/hashtable.h>
+
+struct insn_state {
+ struct cfi_reg cfa;
+ struct cfi_reg regs[CFI_NUM_REGS];
+ int stack_size;
+ unsigned char type;
+ bool bp_scratch;
+ bool drap, end, uaccess, df;
+ unsigned int uaccess_stack;
+ int drap_reg, drap_offset;
+ struct cfi_reg vals[CFI_NUM_REGS];
+};
+
+struct instruction {
+ struct list_head list;
+ struct hlist_node hash;
+ struct section *sec;
+ unsigned long offset;
+ unsigned int len;
+ enum insn_type type;
+ unsigned long immediate;
+ bool alt_group, dead_end, ignore, hint, save, restore, ignore_alts;
+ bool retpoline_safe;
+ u8 visited;
+ struct symbol *call_dest;
+ struct instruction *jump_dest;
+ struct instruction *first_jump_src;
+ struct rela *jump_table;
+ struct list_head alts;
+ struct symbol *func;
+ struct stack_op stack_op;
+ struct insn_state state;
+ struct orc_entry orc;
+};
+
+struct objtool_file {
+ struct elf *elf;
+ struct list_head insn_list;
+ DECLARE_HASHTABLE(insn_hash, 16);
+ bool ignore_unreachables, c_file, hints, rodata;
+};
+
+int check(const char *objname, bool orc);
+
+struct instruction *find_insn(struct objtool_file *file,
+ struct section *sec, unsigned long offset);
+
+#define for_each_insn(file, insn) \
+ list_for_each_entry(insn, &file->insn_list, list)
+
+#define sec_for_each_insn(file, sec, insn) \
+ for (insn = find_insn(file, sec, 0); \
+ insn && &insn->list != &file->insn_list && \
+ insn->sec == sec; \
+ insn = list_next_entry(insn, list))
+
+
+#endif /* _CHECK_H */
diff --git a/marvell/linux/tools/objtool/elf.c b/marvell/linux/tools/objtool/elf.c
new file mode 100644
index 0000000..693d740
--- /dev/null
+++ b/marvell/linux/tools/objtool/elf.c
@@ -0,0 +1,688 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * elf.c - ELF access library
+ *
+ * Adapted from kpatch (https://github.com/dynup/kpatch):
+ * Copyright (C) 2013-2015 Josh Poimboeuf <jpoimboe@redhat.com>
+ * Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "elf.h"
+#include "warn.h"
+
+#define MAX_NAME_LEN 128
+
+struct section *find_section_by_name(struct elf *elf, const char *name)
+{
+ struct section *sec;
+
+ list_for_each_entry(sec, &elf->sections, list)
+ if (!strcmp(sec->name, name))
+ return sec;
+
+ return NULL;
+}
+
+static struct section *find_section_by_index(struct elf *elf,
+ unsigned int idx)
+{
+ struct section *sec;
+
+ list_for_each_entry(sec, &elf->sections, list)
+ if (sec->idx == idx)
+ return sec;
+
+ return NULL;
+}
+
+static struct symbol *find_symbol_by_index(struct elf *elf, unsigned int idx)
+{
+ struct section *sec;
+ struct symbol *sym;
+
+ list_for_each_entry(sec, &elf->sections, list)
+ hash_for_each_possible(sec->symbol_hash, sym, hash, idx)
+ if (sym->idx == idx)
+ return sym;
+
+ return NULL;
+}
+
+struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset)
+{
+ struct symbol *sym;
+
+ list_for_each_entry(sym, &sec->symbol_list, list)
+ if (sym->type != STT_SECTION &&
+ sym->offset == offset)
+ return sym;
+
+ return NULL;
+}
+
+struct symbol *find_symbol_by_name(struct elf *elf, const char *name)
+{
+ struct section *sec;
+ struct symbol *sym;
+
+ list_for_each_entry(sec, &elf->sections, list)
+ list_for_each_entry(sym, &sec->symbol_list, list)
+ if (!strcmp(sym->name, name))
+ return sym;
+
+ return NULL;
+}
+
+struct symbol *find_symbol_containing(struct section *sec, unsigned long offset)
+{
+ struct symbol *sym;
+
+ list_for_each_entry(sym, &sec->symbol_list, list)
+ if (sym->type != STT_SECTION &&
+ offset >= sym->offset && offset < sym->offset + sym->len)
+ return sym;
+
+ return NULL;
+}
+
+struct rela *find_rela_by_dest_range(struct section *sec, unsigned long offset,
+ unsigned int len)
+{
+ struct rela *rela;
+ unsigned long o;
+
+ if (!sec->rela)
+ return NULL;
+
+ for (o = offset; o < offset + len; o++)
+ hash_for_each_possible(sec->rela->rela_hash, rela, hash, o)
+ if (rela->offset == o)
+ return rela;
+
+ return NULL;
+}
+
+struct rela *find_rela_by_dest(struct section *sec, unsigned long offset)
+{
+ return find_rela_by_dest_range(sec, offset, 1);
+}
+
+struct symbol *find_containing_func(struct section *sec, unsigned long offset)
+{
+ struct symbol *func;
+
+ list_for_each_entry(func, &sec->symbol_list, list)
+ if (func->type == STT_FUNC && offset >= func->offset &&
+ offset < func->offset + func->len)
+ return func;
+
+ return NULL;
+}
+
+static int read_sections(struct elf *elf)
+{
+ Elf_Scn *s = NULL;
+ struct section *sec;
+ size_t shstrndx, sections_nr;
+ int i;
+
+ if (elf_getshdrnum(elf->elf, §ions_nr)) {
+ WARN_ELF("elf_getshdrnum");
+ return -1;
+ }
+
+ if (elf_getshdrstrndx(elf->elf, &shstrndx)) {
+ WARN_ELF("elf_getshdrstrndx");
+ return -1;
+ }
+
+ for (i = 0; i < sections_nr; i++) {
+ sec = malloc(sizeof(*sec));
+ if (!sec) {
+ perror("malloc");
+ return -1;
+ }
+ memset(sec, 0, sizeof(*sec));
+
+ INIT_LIST_HEAD(&sec->symbol_list);
+ INIT_LIST_HEAD(&sec->rela_list);
+ hash_init(sec->rela_hash);
+ hash_init(sec->symbol_hash);
+
+ list_add_tail(&sec->list, &elf->sections);
+
+ s = elf_getscn(elf->elf, i);
+ if (!s) {
+ WARN_ELF("elf_getscn");
+ return -1;
+ }
+
+ sec->idx = elf_ndxscn(s);
+
+ if (!gelf_getshdr(s, &sec->sh)) {
+ WARN_ELF("gelf_getshdr");
+ return -1;
+ }
+
+ sec->name = elf_strptr(elf->elf, shstrndx, sec->sh.sh_name);
+ if (!sec->name) {
+ WARN_ELF("elf_strptr");
+ return -1;
+ }
+
+ if (sec->sh.sh_size != 0) {
+ sec->data = elf_getdata(s, NULL);
+ if (!sec->data) {
+ WARN_ELF("elf_getdata");
+ return -1;
+ }
+ if (sec->data->d_off != 0 ||
+ sec->data->d_size != sec->sh.sh_size) {
+ WARN("unexpected data attributes for %s",
+ sec->name);
+ return -1;
+ }
+ }
+ sec->len = sec->sh.sh_size;
+ }
+
+ /* sanity check, one more call to elf_nextscn() should return NULL */
+ if (elf_nextscn(elf->elf, s)) {
+ WARN("section entry mismatch");
+ return -1;
+ }
+
+ return 0;
+}
+
+static int read_symbols(struct elf *elf)
+{
+ struct section *symtab, *sec;
+ struct symbol *sym, *pfunc, *alias;
+ struct list_head *entry, *tmp;
+ int symbols_nr, i;
+ char *coldstr;
+
+ symtab = find_section_by_name(elf, ".symtab");
+ if (!symtab) {
+ /*
+ * A missing symbol table is actually possible if it's an empty
+ * .o file. This can happen for thunk_64.o.
+ */
+ return 0;
+ }
+
+ symbols_nr = symtab->sh.sh_size / symtab->sh.sh_entsize;
+
+ for (i = 0; i < symbols_nr; i++) {
+ sym = malloc(sizeof(*sym));
+ if (!sym) {
+ perror("malloc");
+ return -1;
+ }
+ memset(sym, 0, sizeof(*sym));
+ alias = sym;
+
+ sym->idx = i;
+
+ if (!gelf_getsym(symtab->data, i, &sym->sym)) {
+ WARN_ELF("gelf_getsym");
+ goto err;
+ }
+
+ sym->name = elf_strptr(elf->elf, symtab->sh.sh_link,
+ sym->sym.st_name);
+ if (!sym->name) {
+ WARN_ELF("elf_strptr");
+ goto err;
+ }
+
+ sym->type = GELF_ST_TYPE(sym->sym.st_info);
+ sym->bind = GELF_ST_BIND(sym->sym.st_info);
+
+ if (sym->sym.st_shndx > SHN_UNDEF &&
+ sym->sym.st_shndx < SHN_LORESERVE) {
+ sym->sec = find_section_by_index(elf,
+ sym->sym.st_shndx);
+ if (!sym->sec) {
+ WARN("couldn't find section for symbol %s",
+ sym->name);
+ goto err;
+ }
+ if (sym->type == STT_SECTION) {
+ sym->name = sym->sec->name;
+ sym->sec->sym = sym;
+ }
+ } else
+ sym->sec = find_section_by_index(elf, 0);
+
+ sym->offset = sym->sym.st_value;
+ sym->len = sym->sym.st_size;
+
+ /* sorted insert into a per-section list */
+ entry = &sym->sec->symbol_list;
+ list_for_each_prev(tmp, &sym->sec->symbol_list) {
+ struct symbol *s;
+
+ s = list_entry(tmp, struct symbol, list);
+
+ if (sym->offset > s->offset) {
+ entry = tmp;
+ break;
+ }
+
+ if (sym->offset == s->offset) {
+ if (sym->len && sym->len == s->len && alias == sym)
+ alias = s;
+
+ if (sym->len >= s->len) {
+ entry = tmp;
+ break;
+ }
+ }
+ }
+ sym->alias = alias;
+ list_add(&sym->list, entry);
+ hash_add(sym->sec->symbol_hash, &sym->hash, sym->idx);
+ }
+
+ /* Create parent/child links for any cold subfunctions */
+ list_for_each_entry(sec, &elf->sections, list) {
+ list_for_each_entry(sym, &sec->symbol_list, list) {
+ char pname[MAX_NAME_LEN + 1];
+ size_t pnamelen;
+ if (sym->type != STT_FUNC)
+ continue;
+ sym->pfunc = sym->cfunc = sym;
+ coldstr = strstr(sym->name, ".cold");
+ if (!coldstr)
+ continue;
+
+ pnamelen = coldstr - sym->name;
+ if (pnamelen > MAX_NAME_LEN) {
+ WARN("%s(): parent function name exceeds maximum length of %d characters",
+ sym->name, MAX_NAME_LEN);
+ return -1;
+ }
+
+ strncpy(pname, sym->name, pnamelen);
+ pname[pnamelen] = '\0';
+ pfunc = find_symbol_by_name(elf, pname);
+
+ if (!pfunc) {
+ WARN("%s(): can't find parent function",
+ sym->name);
+ return -1;
+ }
+
+ sym->pfunc = pfunc;
+ pfunc->cfunc = sym;
+
+ /*
+ * Unfortunately, -fnoreorder-functions puts the child
+ * inside the parent. Remove the overlap so we can
+ * have sane assumptions.
+ *
+ * Note that pfunc->len now no longer matches
+ * pfunc->sym.st_size.
+ */
+ if (sym->sec == pfunc->sec &&
+ sym->offset >= pfunc->offset &&
+ sym->offset + sym->len == pfunc->offset + pfunc->len) {
+ pfunc->len -= sym->len;
+ }
+ }
+ }
+
+ return 0;
+
+err:
+ free(sym);
+ return -1;
+}
+
+static int read_relas(struct elf *elf)
+{
+ struct section *sec;
+ struct rela *rela;
+ int i;
+ unsigned int symndx;
+
+ list_for_each_entry(sec, &elf->sections, list) {
+ if (sec->sh.sh_type != SHT_RELA)
+ continue;
+
+ sec->base = find_section_by_name(elf, sec->name + 5);
+ if (!sec->base) {
+ WARN("can't find base section for rela section %s",
+ sec->name);
+ return -1;
+ }
+
+ sec->base->rela = sec;
+
+ for (i = 0; i < sec->sh.sh_size / sec->sh.sh_entsize; i++) {
+ rela = malloc(sizeof(*rela));
+ if (!rela) {
+ perror("malloc");
+ return -1;
+ }
+ memset(rela, 0, sizeof(*rela));
+
+ if (!gelf_getrela(sec->data, i, &rela->rela)) {
+ WARN_ELF("gelf_getrela");
+ return -1;
+ }
+
+ rela->type = GELF_R_TYPE(rela->rela.r_info);
+ rela->addend = rela->rela.r_addend;
+ rela->offset = rela->rela.r_offset;
+ symndx = GELF_R_SYM(rela->rela.r_info);
+ rela->sym = find_symbol_by_index(elf, symndx);
+ rela->sec = sec;
+ if (!rela->sym) {
+ WARN("can't find rela entry symbol %d for %s",
+ symndx, sec->name);
+ return -1;
+ }
+
+ list_add_tail(&rela->list, &sec->rela_list);
+ hash_add(sec->rela_hash, &rela->hash, rela->offset);
+
+ }
+ }
+
+ return 0;
+}
+
+struct elf *elf_read(const char *name, int flags)
+{
+ struct elf *elf;
+ Elf_Cmd cmd;
+
+ elf_version(EV_CURRENT);
+
+ elf = malloc(sizeof(*elf));
+ if (!elf) {
+ perror("malloc");
+ return NULL;
+ }
+ memset(elf, 0, sizeof(*elf));
+
+ INIT_LIST_HEAD(&elf->sections);
+
+ elf->fd = open(name, flags);
+ if (elf->fd == -1) {
+ fprintf(stderr, "objtool: Can't open '%s': %s\n",
+ name, strerror(errno));
+ goto err;
+ }
+
+ if ((flags & O_ACCMODE) == O_RDONLY)
+ cmd = ELF_C_READ_MMAP;
+ else if ((flags & O_ACCMODE) == O_RDWR)
+ cmd = ELF_C_RDWR;
+ else /* O_WRONLY */
+ cmd = ELF_C_WRITE;
+
+ elf->elf = elf_begin(elf->fd, cmd, NULL);
+ if (!elf->elf) {
+ WARN_ELF("elf_begin");
+ goto err;
+ }
+
+ if (!gelf_getehdr(elf->elf, &elf->ehdr)) {
+ WARN_ELF("gelf_getehdr");
+ goto err;
+ }
+
+ if (read_sections(elf))
+ goto err;
+
+ if (read_symbols(elf))
+ goto err;
+
+ if (read_relas(elf))
+ goto err;
+
+ return elf;
+
+err:
+ elf_close(elf);
+ return NULL;
+}
+
+struct section *elf_create_section(struct elf *elf, const char *name,
+ size_t entsize, int nr)
+{
+ struct section *sec, *shstrtab;
+ size_t size = entsize * nr;
+ Elf_Scn *s;
+ Elf_Data *data;
+
+ sec = malloc(sizeof(*sec));
+ if (!sec) {
+ perror("malloc");
+ return NULL;
+ }
+ memset(sec, 0, sizeof(*sec));
+
+ INIT_LIST_HEAD(&sec->symbol_list);
+ INIT_LIST_HEAD(&sec->rela_list);
+ hash_init(sec->rela_hash);
+ hash_init(sec->symbol_hash);
+
+ list_add_tail(&sec->list, &elf->sections);
+
+ s = elf_newscn(elf->elf);
+ if (!s) {
+ WARN_ELF("elf_newscn");
+ return NULL;
+ }
+
+ sec->name = strdup(name);
+ if (!sec->name) {
+ perror("strdup");
+ return NULL;
+ }
+
+ sec->idx = elf_ndxscn(s);
+ sec->len = size;
+ sec->changed = true;
+
+ sec->data = elf_newdata(s);
+ if (!sec->data) {
+ WARN_ELF("elf_newdata");
+ return NULL;
+ }
+
+ sec->data->d_size = size;
+ sec->data->d_align = 1;
+
+ if (size) {
+ sec->data->d_buf = malloc(size);
+ if (!sec->data->d_buf) {
+ perror("malloc");
+ return NULL;
+ }
+ memset(sec->data->d_buf, 0, size);
+ }
+
+ if (!gelf_getshdr(s, &sec->sh)) {
+ WARN_ELF("gelf_getshdr");
+ return NULL;
+ }
+
+ sec->sh.sh_size = size;
+ sec->sh.sh_entsize = entsize;
+ sec->sh.sh_type = SHT_PROGBITS;
+ sec->sh.sh_addralign = 1;
+ sec->sh.sh_flags = SHF_ALLOC;
+
+
+ /* Add section name to .shstrtab (or .strtab for Clang) */
+ shstrtab = find_section_by_name(elf, ".shstrtab");
+ if (!shstrtab)
+ shstrtab = find_section_by_name(elf, ".strtab");
+ if (!shstrtab) {
+ WARN("can't find .shstrtab or .strtab section");
+ return NULL;
+ }
+
+ s = elf_getscn(elf->elf, shstrtab->idx);
+ if (!s) {
+ WARN_ELF("elf_getscn");
+ return NULL;
+ }
+
+ data = elf_newdata(s);
+ if (!data) {
+ WARN_ELF("elf_newdata");
+ return NULL;
+ }
+
+ data->d_buf = sec->name;
+ data->d_size = strlen(name) + 1;
+ data->d_align = 1;
+
+ sec->sh.sh_name = shstrtab->len;
+
+ shstrtab->len += strlen(name) + 1;
+ shstrtab->changed = true;
+
+ return sec;
+}
+
+struct section *elf_create_rela_section(struct elf *elf, struct section *base)
+{
+ char *relaname;
+ struct section *sec;
+
+ relaname = malloc(strlen(base->name) + strlen(".rela") + 1);
+ if (!relaname) {
+ perror("malloc");
+ return NULL;
+ }
+ strcpy(relaname, ".rela");
+ strcat(relaname, base->name);
+
+ sec = elf_create_section(elf, relaname, sizeof(GElf_Rela), 0);
+ free(relaname);
+ if (!sec)
+ return NULL;
+
+ base->rela = sec;
+ sec->base = base;
+
+ sec->sh.sh_type = SHT_RELA;
+ sec->sh.sh_addralign = 8;
+ sec->sh.sh_link = find_section_by_name(elf, ".symtab")->idx;
+ sec->sh.sh_info = base->idx;
+ sec->sh.sh_flags = SHF_INFO_LINK;
+
+ return sec;
+}
+
+int elf_rebuild_rela_section(struct section *sec)
+{
+ struct rela *rela;
+ int nr, idx = 0, size;
+ GElf_Rela *relas;
+
+ nr = 0;
+ list_for_each_entry(rela, &sec->rela_list, list)
+ nr++;
+
+ size = nr * sizeof(*relas);
+ relas = malloc(size);
+ if (!relas) {
+ perror("malloc");
+ return -1;
+ }
+
+ sec->data->d_buf = relas;
+ sec->data->d_size = size;
+
+ sec->sh.sh_size = size;
+
+ idx = 0;
+ list_for_each_entry(rela, &sec->rela_list, list) {
+ relas[idx].r_offset = rela->offset;
+ relas[idx].r_addend = rela->addend;
+ relas[idx].r_info = GELF_R_INFO(rela->sym->idx, rela->type);
+ idx++;
+ }
+
+ return 0;
+}
+
+int elf_write(struct elf *elf)
+{
+ struct section *sec;
+ Elf_Scn *s;
+
+ /* Update section headers for changed sections: */
+ list_for_each_entry(sec, &elf->sections, list) {
+ if (sec->changed) {
+ s = elf_getscn(elf->elf, sec->idx);
+ if (!s) {
+ WARN_ELF("elf_getscn");
+ return -1;
+ }
+ if (!gelf_update_shdr(s, &sec->sh)) {
+ WARN_ELF("gelf_update_shdr");
+ return -1;
+ }
+ }
+ }
+
+ /* Make sure the new section header entries get updated properly. */
+ elf_flagelf(elf->elf, ELF_C_SET, ELF_F_DIRTY);
+
+ /* Write all changes to the file. */
+ if (elf_update(elf->elf, ELF_C_WRITE) < 0) {
+ WARN_ELF("elf_update");
+ return -1;
+ }
+
+ return 0;
+}
+
+void elf_close(struct elf *elf)
+{
+ struct section *sec, *tmpsec;
+ struct symbol *sym, *tmpsym;
+ struct rela *rela, *tmprela;
+
+ if (elf->elf)
+ elf_end(elf->elf);
+
+ if (elf->fd > 0)
+ close(elf->fd);
+
+ list_for_each_entry_safe(sec, tmpsec, &elf->sections, list) {
+ list_for_each_entry_safe(sym, tmpsym, &sec->symbol_list, list) {
+ list_del(&sym->list);
+ hash_del(&sym->hash);
+ free(sym);
+ }
+ list_for_each_entry_safe(rela, tmprela, &sec->rela_list, list) {
+ list_del(&rela->list);
+ hash_del(&rela->hash);
+ free(rela);
+ }
+ list_del(&sec->list);
+ free(sec);
+ }
+
+ free(elf);
+}
diff --git a/marvell/linux/tools/objtool/elf.h b/marvell/linux/tools/objtool/elf.h
new file mode 100644
index 0000000..4415020
--- /dev/null
+++ b/marvell/linux/tools/objtool/elf.h
@@ -0,0 +1,97 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+#ifndef _OBJTOOL_ELF_H
+#define _OBJTOOL_ELF_H
+
+#include <stdio.h>
+#include <gelf.h>
+#include <linux/list.h>
+#include <linux/hashtable.h>
+
+#ifdef LIBELF_USE_DEPRECATED
+# define elf_getshdrnum elf_getshnum
+# define elf_getshdrstrndx elf_getshstrndx
+#endif
+
+/*
+ * Fallback for systems without this "read, mmaping if possible" cmd.
+ */
+#ifndef ELF_C_READ_MMAP
+#define ELF_C_READ_MMAP ELF_C_READ
+#endif
+
+struct section {
+ struct list_head list;
+ GElf_Shdr sh;
+ struct list_head symbol_list;
+ DECLARE_HASHTABLE(symbol_hash, 8);
+ struct list_head rela_list;
+ DECLARE_HASHTABLE(rela_hash, 16);
+ struct section *base, *rela;
+ struct symbol *sym;
+ Elf_Data *data;
+ char *name;
+ int idx;
+ unsigned int len;
+ bool changed, text, rodata;
+};
+
+struct symbol {
+ struct list_head list;
+ struct hlist_node hash;
+ GElf_Sym sym;
+ struct section *sec;
+ char *name;
+ unsigned int idx;
+ unsigned char bind, type;
+ unsigned long offset;
+ unsigned int len;
+ struct symbol *pfunc, *cfunc, *alias;
+ bool uaccess_safe;
+};
+
+struct rela {
+ struct list_head list;
+ struct hlist_node hash;
+ GElf_Rela rela;
+ struct section *sec;
+ struct symbol *sym;
+ unsigned int type;
+ unsigned long offset;
+ int addend;
+ bool jump_table_start;
+};
+
+struct elf {
+ Elf *elf;
+ GElf_Ehdr ehdr;
+ int fd;
+ char *name;
+ struct list_head sections;
+ DECLARE_HASHTABLE(rela_hash, 16);
+};
+
+
+struct elf *elf_read(const char *name, int flags);
+struct section *find_section_by_name(struct elf *elf, const char *name);
+struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset);
+struct symbol *find_symbol_by_name(struct elf *elf, const char *name);
+struct symbol *find_symbol_containing(struct section *sec, unsigned long offset);
+struct rela *find_rela_by_dest(struct section *sec, unsigned long offset);
+struct rela *find_rela_by_dest_range(struct section *sec, unsigned long offset,
+ unsigned int len);
+struct symbol *find_containing_func(struct section *sec, unsigned long offset);
+struct section *elf_create_section(struct elf *elf, const char *name, size_t
+ entsize, int nr);
+struct section *elf_create_rela_section(struct elf *elf, struct section *base);
+int elf_rebuild_rela_section(struct section *sec);
+int elf_write(struct elf *elf);
+void elf_close(struct elf *elf);
+
+#define for_each_sec(file, sec) \
+ list_for_each_entry(sec, &file->elf->sections, list)
+
+#endif /* _OBJTOOL_ELF_H */
diff --git a/marvell/linux/tools/objtool/objtool.c b/marvell/linux/tools/objtool/objtool.c
new file mode 100644
index 0000000..0b3528f
--- /dev/null
+++ b/marvell/linux/tools/objtool/objtool.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+/*
+ * objtool:
+ *
+ * The 'check' subcmd analyzes every .o file and ensures the validity of its
+ * stack trace metadata. It enforces a set of rules on asm code and C inline
+ * assembly code so that stack traces can be reliable.
+ *
+ * For more information, see tools/objtool/Documentation/stack-validation.txt.
+ */
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdlib.h>
+#include <subcmd/exec-cmd.h>
+#include <subcmd/pager.h>
+#include <linux/kernel.h>
+
+#include "builtin.h"
+
+struct cmd_struct {
+ const char *name;
+ int (*fn)(int, const char **);
+ const char *help;
+};
+
+static const char objtool_usage_string[] =
+ "objtool COMMAND [ARGS]";
+
+static struct cmd_struct objtool_cmds[] = {
+ {"check", cmd_check, "Perform stack metadata validation on an object file" },
+ {"orc", cmd_orc, "Generate in-place ORC unwind tables for an object file" },
+};
+
+bool help;
+
+static void cmd_usage(void)
+{
+ unsigned int i, longest = 0;
+
+ printf("\n usage: %s\n\n", objtool_usage_string);
+
+ for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
+ if (longest < strlen(objtool_cmds[i].name))
+ longest = strlen(objtool_cmds[i].name);
+ }
+
+ puts(" Commands:");
+ for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
+ printf(" %-*s ", longest, objtool_cmds[i].name);
+ puts(objtool_cmds[i].help);
+ }
+
+ printf("\n");
+
+ exit(129);
+}
+
+static void handle_options(int *argc, const char ***argv)
+{
+ while (*argc > 0) {
+ const char *cmd = (*argv)[0];
+
+ if (cmd[0] != '-')
+ break;
+
+ if (!strcmp(cmd, "--help") || !strcmp(cmd, "-h")) {
+ help = true;
+ break;
+ } else {
+ fprintf(stderr, "Unknown option: %s\n", cmd);
+ cmd_usage();
+ }
+
+ (*argv)++;
+ (*argc)--;
+ }
+}
+
+static void handle_internal_command(int argc, const char **argv)
+{
+ const char *cmd = argv[0];
+ unsigned int i, ret;
+
+ for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
+ struct cmd_struct *p = objtool_cmds+i;
+
+ if (strcmp(p->name, cmd))
+ continue;
+
+ ret = p->fn(argc, argv);
+
+ exit(ret);
+ }
+
+ cmd_usage();
+}
+
+int main(int argc, const char **argv)
+{
+ static const char *UNUSED = "OBJTOOL_NOT_IMPLEMENTED";
+
+ /* libsubcmd init */
+ exec_cmd_init("objtool", UNUSED, UNUSED, UNUSED);
+ pager_init(UNUSED);
+
+ argv++;
+ argc--;
+ handle_options(&argc, &argv);
+
+ if (!argc || help)
+ cmd_usage();
+
+ handle_internal_command(argc, argv);
+
+ return 0;
+}
diff --git a/marvell/linux/tools/objtool/orc.h b/marvell/linux/tools/objtool/orc.h
new file mode 100644
index 0000000..ee28322
--- /dev/null
+++ b/marvell/linux/tools/objtool/orc.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+#ifndef _ORC_H
+#define _ORC_H
+
+#include <asm/orc_types.h>
+
+struct objtool_file;
+
+int create_orc(struct objtool_file *file);
+int create_orc_sections(struct objtool_file *file);
+
+int orc_dump(const char *objname);
+
+#endif /* _ORC_H */
diff --git a/marvell/linux/tools/objtool/orc_dump.c b/marvell/linux/tools/objtool/orc_dump.c
new file mode 100644
index 0000000..ba4cbb1
--- /dev/null
+++ b/marvell/linux/tools/objtool/orc_dump.c
@@ -0,0 +1,212 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+#include <unistd.h>
+#include "orc.h"
+#include "warn.h"
+
+static const char *reg_name(unsigned int reg)
+{
+ switch (reg) {
+ case ORC_REG_PREV_SP:
+ return "prevsp";
+ case ORC_REG_DX:
+ return "dx";
+ case ORC_REG_DI:
+ return "di";
+ case ORC_REG_BP:
+ return "bp";
+ case ORC_REG_SP:
+ return "sp";
+ case ORC_REG_R10:
+ return "r10";
+ case ORC_REG_R13:
+ return "r13";
+ case ORC_REG_BP_INDIRECT:
+ return "bp(ind)";
+ case ORC_REG_SP_INDIRECT:
+ return "sp(ind)";
+ default:
+ return "?";
+ }
+}
+
+static const char *orc_type_name(unsigned int type)
+{
+ switch (type) {
+ case ORC_TYPE_CALL:
+ return "call";
+ case ORC_TYPE_REGS:
+ return "regs";
+ case ORC_TYPE_REGS_IRET:
+ return "iret";
+ default:
+ return "?";
+ }
+}
+
+static void print_reg(unsigned int reg, int offset)
+{
+ if (reg == ORC_REG_BP_INDIRECT)
+ printf("(bp%+d)", offset);
+ else if (reg == ORC_REG_SP_INDIRECT)
+ printf("(sp%+d)", offset);
+ else if (reg == ORC_REG_UNDEFINED)
+ printf("(und)");
+ else
+ printf("%s%+d", reg_name(reg), offset);
+}
+
+int orc_dump(const char *_objname)
+{
+ int fd, nr_entries, i, *orc_ip = NULL, orc_size = 0;
+ struct orc_entry *orc = NULL;
+ char *name;
+ size_t nr_sections;
+ Elf64_Addr orc_ip_addr = 0;
+ size_t shstrtab_idx, strtab_idx = 0;
+ Elf *elf;
+ Elf_Scn *scn;
+ GElf_Shdr sh;
+ GElf_Rela rela;
+ GElf_Sym sym;
+ Elf_Data *data, *symtab = NULL, *rela_orc_ip = NULL;
+
+
+ objname = _objname;
+
+ elf_version(EV_CURRENT);
+
+ fd = open(objname, O_RDONLY);
+ if (fd == -1) {
+ perror("open");
+ return -1;
+ }
+
+ elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
+ if (!elf) {
+ WARN_ELF("elf_begin");
+ return -1;
+ }
+
+ if (elf_getshdrnum(elf, &nr_sections)) {
+ WARN_ELF("elf_getshdrnum");
+ return -1;
+ }
+
+ if (elf_getshdrstrndx(elf, &shstrtab_idx)) {
+ WARN_ELF("elf_getshdrstrndx");
+ return -1;
+ }
+
+ for (i = 0; i < nr_sections; i++) {
+ scn = elf_getscn(elf, i);
+ if (!scn) {
+ WARN_ELF("elf_getscn");
+ return -1;
+ }
+
+ if (!gelf_getshdr(scn, &sh)) {
+ WARN_ELF("gelf_getshdr");
+ return -1;
+ }
+
+ name = elf_strptr(elf, shstrtab_idx, sh.sh_name);
+ if (!name) {
+ WARN_ELF("elf_strptr");
+ return -1;
+ }
+
+ data = elf_getdata(scn, NULL);
+ if (!data) {
+ WARN_ELF("elf_getdata");
+ return -1;
+ }
+
+ if (!strcmp(name, ".symtab")) {
+ symtab = data;
+ } else if (!strcmp(name, ".strtab")) {
+ strtab_idx = i;
+ } else if (!strcmp(name, ".orc_unwind")) {
+ orc = data->d_buf;
+ orc_size = sh.sh_size;
+ } else if (!strcmp(name, ".orc_unwind_ip")) {
+ orc_ip = data->d_buf;
+ orc_ip_addr = sh.sh_addr;
+ } else if (!strcmp(name, ".rela.orc_unwind_ip")) {
+ rela_orc_ip = data;
+ }
+ }
+
+ if (!symtab || !strtab_idx || !orc || !orc_ip)
+ return 0;
+
+ if (orc_size % sizeof(*orc) != 0) {
+ WARN("bad .orc_unwind section size");
+ return -1;
+ }
+
+ nr_entries = orc_size / sizeof(*orc);
+ for (i = 0; i < nr_entries; i++) {
+ if (rela_orc_ip) {
+ if (!gelf_getrela(rela_orc_ip, i, &rela)) {
+ WARN_ELF("gelf_getrela");
+ return -1;
+ }
+
+ if (!gelf_getsym(symtab, GELF_R_SYM(rela.r_info), &sym)) {
+ WARN_ELF("gelf_getsym");
+ return -1;
+ }
+
+ if (GELF_ST_TYPE(sym.st_info) == STT_SECTION) {
+ scn = elf_getscn(elf, sym.st_shndx);
+ if (!scn) {
+ WARN_ELF("elf_getscn");
+ return -1;
+ }
+
+ if (!gelf_getshdr(scn, &sh)) {
+ WARN_ELF("gelf_getshdr");
+ return -1;
+ }
+
+ name = elf_strptr(elf, shstrtab_idx, sh.sh_name);
+ if (!name) {
+ WARN_ELF("elf_strptr");
+ return -1;
+ }
+ } else {
+ name = elf_strptr(elf, strtab_idx, sym.st_name);
+ if (!name) {
+ WARN_ELF("elf_strptr");
+ return -1;
+ }
+ }
+
+ printf("%s+%llx:", name, (unsigned long long)rela.r_addend);
+
+ } else {
+ printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i]));
+ }
+
+
+ printf(" sp:");
+
+ print_reg(orc[i].sp_reg, orc[i].sp_offset);
+
+ printf(" bp:");
+
+ print_reg(orc[i].bp_reg, orc[i].bp_offset);
+
+ printf(" type:%s end:%d\n",
+ orc_type_name(orc[i].type), orc[i].end);
+ }
+
+ elf_end(elf);
+ close(fd);
+
+ return 0;
+}
diff --git a/marvell/linux/tools/objtool/orc_gen.c b/marvell/linux/tools/objtool/orc_gen.c
new file mode 100644
index 0000000..e8c34b0
--- /dev/null
+++ b/marvell/linux/tools/objtool/orc_gen.c
@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "orc.h"
+#include "check.h"
+#include "warn.h"
+
+int create_orc(struct objtool_file *file)
+{
+ struct instruction *insn;
+
+ for_each_insn(file, insn) {
+ struct orc_entry *orc = &insn->orc;
+ struct cfi_reg *cfa = &insn->state.cfa;
+ struct cfi_reg *bp = &insn->state.regs[CFI_BP];
+
+ orc->end = insn->state.end;
+
+ if (cfa->base == CFI_UNDEFINED) {
+ orc->sp_reg = ORC_REG_UNDEFINED;
+ continue;
+ }
+
+ switch (cfa->base) {
+ case CFI_SP:
+ orc->sp_reg = ORC_REG_SP;
+ break;
+ case CFI_SP_INDIRECT:
+ orc->sp_reg = ORC_REG_SP_INDIRECT;
+ break;
+ case CFI_BP:
+ orc->sp_reg = ORC_REG_BP;
+ break;
+ case CFI_BP_INDIRECT:
+ orc->sp_reg = ORC_REG_BP_INDIRECT;
+ break;
+ case CFI_R10:
+ orc->sp_reg = ORC_REG_R10;
+ break;
+ case CFI_R13:
+ orc->sp_reg = ORC_REG_R13;
+ break;
+ case CFI_DI:
+ orc->sp_reg = ORC_REG_DI;
+ break;
+ case CFI_DX:
+ orc->sp_reg = ORC_REG_DX;
+ break;
+ default:
+ WARN_FUNC("unknown CFA base reg %d",
+ insn->sec, insn->offset, cfa->base);
+ return -1;
+ }
+
+ switch(bp->base) {
+ case CFI_UNDEFINED:
+ orc->bp_reg = ORC_REG_UNDEFINED;
+ break;
+ case CFI_CFA:
+ orc->bp_reg = ORC_REG_PREV_SP;
+ break;
+ case CFI_BP:
+ orc->bp_reg = ORC_REG_BP;
+ break;
+ default:
+ WARN_FUNC("unknown BP base reg %d",
+ insn->sec, insn->offset, bp->base);
+ return -1;
+ }
+
+ orc->sp_offset = cfa->offset;
+ orc->bp_offset = bp->offset;
+ orc->type = insn->state.type;
+ }
+
+ return 0;
+}
+
+static int create_orc_entry(struct section *u_sec, struct section *ip_relasec,
+ unsigned int idx, struct section *insn_sec,
+ unsigned long insn_off, struct orc_entry *o)
+{
+ struct orc_entry *orc;
+ struct rela *rela;
+
+ /* populate ORC data */
+ orc = (struct orc_entry *)u_sec->data->d_buf + idx;
+ memcpy(orc, o, sizeof(*orc));
+
+ /* populate rela for ip */
+ rela = malloc(sizeof(*rela));
+ if (!rela) {
+ perror("malloc");
+ return -1;
+ }
+ memset(rela, 0, sizeof(*rela));
+
+ if (insn_sec->sym) {
+ rela->sym = insn_sec->sym;
+ rela->addend = insn_off;
+ } else {
+ /*
+ * The Clang assembler doesn't produce section symbols, so we
+ * have to reference the function symbol instead:
+ */
+ rela->sym = find_symbol_containing(insn_sec, insn_off);
+ if (!rela->sym) {
+ /*
+ * Hack alert. This happens when we need to reference
+ * the NOP pad insn immediately after the function.
+ */
+ rela->sym = find_symbol_containing(insn_sec,
+ insn_off - 1);
+ }
+ if (!rela->sym) {
+ WARN("missing symbol for insn at offset 0x%lx\n",
+ insn_off);
+ return -1;
+ }
+
+ rela->addend = insn_off - rela->sym->offset;
+ }
+
+ rela->type = R_X86_64_PC32;
+ rela->offset = idx * sizeof(int);
+
+ list_add_tail(&rela->list, &ip_relasec->rela_list);
+ hash_add(ip_relasec->rela_hash, &rela->hash, rela->offset);
+
+ return 0;
+}
+
+int create_orc_sections(struct objtool_file *file)
+{
+ struct instruction *insn, *prev_insn;
+ struct section *sec, *u_sec, *ip_relasec;
+ unsigned int idx;
+
+ struct orc_entry empty = {
+ .sp_reg = ORC_REG_UNDEFINED,
+ .bp_reg = ORC_REG_UNDEFINED,
+ .type = ORC_TYPE_CALL,
+ };
+
+ sec = find_section_by_name(file->elf, ".orc_unwind");
+ if (sec) {
+ WARN("file already has .orc_unwind section, skipping");
+ return -1;
+ }
+
+ /* count the number of needed orcs */
+ idx = 0;
+ for_each_sec(file, sec) {
+ if (!sec->text)
+ continue;
+
+ prev_insn = NULL;
+ sec_for_each_insn(file, sec, insn) {
+ if (!prev_insn ||
+ memcmp(&insn->orc, &prev_insn->orc,
+ sizeof(struct orc_entry))) {
+ idx++;
+ }
+ prev_insn = insn;
+ }
+
+ /* section terminator */
+ if (prev_insn)
+ idx++;
+ }
+ if (!idx)
+ return -1;
+
+
+ /* create .orc_unwind_ip and .rela.orc_unwind_ip sections */
+ sec = elf_create_section(file->elf, ".orc_unwind_ip", sizeof(int), idx);
+ if (!sec)
+ return -1;
+
+ ip_relasec = elf_create_rela_section(file->elf, sec);
+ if (!ip_relasec)
+ return -1;
+
+ /* create .orc_unwind section */
+ u_sec = elf_create_section(file->elf, ".orc_unwind",
+ sizeof(struct orc_entry), idx);
+
+ /* populate sections */
+ idx = 0;
+ for_each_sec(file, sec) {
+ if (!sec->text)
+ continue;
+
+ prev_insn = NULL;
+ sec_for_each_insn(file, sec, insn) {
+ if (!prev_insn || memcmp(&insn->orc, &prev_insn->orc,
+ sizeof(struct orc_entry))) {
+
+ if (create_orc_entry(u_sec, ip_relasec, idx,
+ insn->sec, insn->offset,
+ &insn->orc))
+ return -1;
+
+ idx++;
+ }
+ prev_insn = insn;
+ }
+
+ /* section terminator */
+ if (prev_insn) {
+ if (create_orc_entry(u_sec, ip_relasec, idx,
+ prev_insn->sec,
+ prev_insn->offset + prev_insn->len,
+ &empty))
+ return -1;
+
+ idx++;
+ }
+ }
+
+ if (elf_rebuild_rela_section(ip_relasec))
+ return -1;
+
+ return 0;
+}
diff --git a/marvell/linux/tools/objtool/special.c b/marvell/linux/tools/objtool/special.c
new file mode 100644
index 0000000..fdbaa61
--- /dev/null
+++ b/marvell/linux/tools/objtool/special.c
@@ -0,0 +1,199 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+/*
+ * This file reads all the special sections which have alternate instructions
+ * which can be patched in or redirected to at runtime.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "builtin.h"
+#include "special.h"
+#include "warn.h"
+
+#define EX_ENTRY_SIZE 12
+#define EX_ORIG_OFFSET 0
+#define EX_NEW_OFFSET 4
+
+#define JUMP_ENTRY_SIZE 16
+#define JUMP_ORIG_OFFSET 0
+#define JUMP_NEW_OFFSET 4
+
+#define ALT_ENTRY_SIZE 13
+#define ALT_ORIG_OFFSET 0
+#define ALT_NEW_OFFSET 4
+#define ALT_FEATURE_OFFSET 8
+#define ALT_ORIG_LEN_OFFSET 10
+#define ALT_NEW_LEN_OFFSET 11
+
+#define X86_FEATURE_POPCNT (4*32+23)
+#define X86_FEATURE_SMAP (9*32+20)
+
+struct special_entry {
+ const char *sec;
+ bool group, jump_or_nop;
+ unsigned char size, orig, new;
+ unsigned char orig_len, new_len; /* group only */
+ unsigned char feature; /* ALTERNATIVE macro CPU feature */
+};
+
+struct special_entry entries[] = {
+ {
+ .sec = ".altinstructions",
+ .group = true,
+ .size = ALT_ENTRY_SIZE,
+ .orig = ALT_ORIG_OFFSET,
+ .orig_len = ALT_ORIG_LEN_OFFSET,
+ .new = ALT_NEW_OFFSET,
+ .new_len = ALT_NEW_LEN_OFFSET,
+ .feature = ALT_FEATURE_OFFSET,
+ },
+ {
+ .sec = "__jump_table",
+ .jump_or_nop = true,
+ .size = JUMP_ENTRY_SIZE,
+ .orig = JUMP_ORIG_OFFSET,
+ .new = JUMP_NEW_OFFSET,
+ },
+ {
+ .sec = "__ex_table",
+ .size = EX_ENTRY_SIZE,
+ .orig = EX_ORIG_OFFSET,
+ .new = EX_NEW_OFFSET,
+ },
+ {},
+};
+
+static int get_alt_entry(struct elf *elf, struct special_entry *entry,
+ struct section *sec, int idx,
+ struct special_alt *alt)
+{
+ struct rela *orig_rela, *new_rela;
+ unsigned long offset;
+
+ offset = idx * entry->size;
+
+ alt->group = entry->group;
+ alt->jump_or_nop = entry->jump_or_nop;
+
+ if (alt->group) {
+ alt->orig_len = *(unsigned char *)(sec->data->d_buf + offset +
+ entry->orig_len);
+ alt->new_len = *(unsigned char *)(sec->data->d_buf + offset +
+ entry->new_len);
+ }
+
+ if (entry->feature) {
+ unsigned short feature;
+
+ feature = *(unsigned short *)(sec->data->d_buf + offset +
+ entry->feature);
+
+ /*
+ * It has been requested that we don't validate the !POPCNT
+ * feature path which is a "very very small percentage of
+ * machines".
+ */
+ if (feature == X86_FEATURE_POPCNT)
+ alt->skip_orig = true;
+
+ /*
+ * If UACCESS validation is enabled; force that alternative;
+ * otherwise force it the other way.
+ *
+ * What we want to avoid is having both the original and the
+ * alternative code flow at the same time, in that case we can
+ * find paths that see the STAC but take the NOP instead of
+ * CLAC and the other way around.
+ */
+ if (feature == X86_FEATURE_SMAP) {
+ if (uaccess)
+ alt->skip_orig = true;
+ else
+ alt->skip_alt = true;
+ }
+ }
+
+ orig_rela = find_rela_by_dest(sec, offset + entry->orig);
+ if (!orig_rela) {
+ WARN_FUNC("can't find orig rela", sec, offset + entry->orig);
+ return -1;
+ }
+ if (orig_rela->sym->type != STT_SECTION) {
+ WARN_FUNC("don't know how to handle non-section rela symbol %s",
+ sec, offset + entry->orig, orig_rela->sym->name);
+ return -1;
+ }
+
+ alt->orig_sec = orig_rela->sym->sec;
+ alt->orig_off = orig_rela->addend;
+
+ if (!entry->group || alt->new_len) {
+ new_rela = find_rela_by_dest(sec, offset + entry->new);
+ if (!new_rela) {
+ WARN_FUNC("can't find new rela",
+ sec, offset + entry->new);
+ return -1;
+ }
+
+ alt->new_sec = new_rela->sym->sec;
+ alt->new_off = (unsigned int)new_rela->addend;
+
+ /* _ASM_EXTABLE_EX hack */
+ if (alt->new_off >= 0x7ffffff0)
+ alt->new_off -= 0x7ffffff0;
+ }
+
+ return 0;
+}
+
+/*
+ * Read all the special sections and create a list of special_alt structs which
+ * describe all the alternate instructions which can be patched in or
+ * redirected to at runtime.
+ */
+int special_get_alts(struct elf *elf, struct list_head *alts)
+{
+ struct special_entry *entry;
+ struct section *sec;
+ unsigned int nr_entries;
+ struct special_alt *alt;
+ int idx, ret;
+
+ INIT_LIST_HEAD(alts);
+
+ for (entry = entries; entry->sec; entry++) {
+ sec = find_section_by_name(elf, entry->sec);
+ if (!sec)
+ continue;
+
+ if (sec->len % entry->size != 0) {
+ WARN("%s size not a multiple of %d",
+ sec->name, entry->size);
+ return -1;
+ }
+
+ nr_entries = sec->len / entry->size;
+
+ for (idx = 0; idx < nr_entries; idx++) {
+ alt = malloc(sizeof(*alt));
+ if (!alt) {
+ WARN("malloc failed");
+ return -1;
+ }
+ memset(alt, 0, sizeof(*alt));
+
+ ret = get_alt_entry(elf, entry, sec, idx, alt);
+ if (ret)
+ return ret;
+
+ list_add_tail(&alt->list, alts);
+ }
+ }
+
+ return 0;
+}
diff --git a/marvell/linux/tools/objtool/special.h b/marvell/linux/tools/objtool/special.h
new file mode 100644
index 0000000..3506153
--- /dev/null
+++ b/marvell/linux/tools/objtool/special.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+#ifndef _SPECIAL_H
+#define _SPECIAL_H
+
+#include <stdbool.h>
+#include "elf.h"
+
+struct special_alt {
+ struct list_head list;
+
+ bool group;
+ bool skip_orig;
+ bool skip_alt;
+ bool jump_or_nop;
+
+ struct section *orig_sec;
+ unsigned long orig_off;
+
+ struct section *new_sec;
+ unsigned long new_off;
+
+ unsigned int orig_len, new_len; /* group only */
+};
+
+int special_get_alts(struct elf *elf, struct list_head *alts);
+
+#endif /* _SPECIAL_H */
diff --git a/marvell/linux/tools/objtool/sync-check.sh b/marvell/linux/tools/objtool/sync-check.sh
new file mode 100755
index 0000000..2a1261b
--- /dev/null
+++ b/marvell/linux/tools/objtool/sync-check.sh
@@ -0,0 +1,50 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+FILES='
+arch/x86/include/asm/inat_types.h
+arch/x86/include/asm/orc_types.h
+arch/x86/include/asm/emulate_prefix.h
+arch/x86/lib/x86-opcode-map.txt
+arch/x86/tools/gen-insn-attr-x86.awk
+'
+
+check_2 () {
+ file1=$1
+ file2=$2
+
+ shift
+ shift
+
+ cmd="diff $* $file1 $file2 > /dev/null"
+
+ test -f $file2 && {
+ eval $cmd || {
+ echo "Warning: Kernel ABI header at '$file1' differs from latest version at '$file2'" >&2
+ echo diff -u $file1 $file2
+ }
+ }
+}
+
+check () {
+ file=$1
+
+ shift
+
+ check_2 tools/$file $file $*
+}
+
+if [ ! -d ../../kernel ] || [ ! -d ../../tools ] || [ ! -d ../objtool ]; then
+ exit 0
+fi
+
+cd ../..
+
+for i in $FILES; do
+ check $i
+done
+
+check arch/x86/include/asm/inat.h '-I "^#include [\"<]\(asm/\)*inat_types.h[\">]"'
+check arch/x86/include/asm/insn.h '-I "^#include [\"<]\(asm/\)*inat.h[\">]"'
+check arch/x86/lib/inat.c '-I "^#include [\"<]\(../include/\)*asm/insn.h[\">]"'
+check arch/x86/lib/insn.c '-I "^#include [\"<]\(../include/\)*asm/in\(at\|sn\).h[\">]" -I "^#include [\"<]\(../include/\)*asm/emulate_prefix.h[\">]"'
diff --git a/marvell/linux/tools/objtool/warn.h b/marvell/linux/tools/objtool/warn.h
new file mode 100644
index 0000000..cbb0a02
--- /dev/null
+++ b/marvell/linux/tools/objtool/warn.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+#ifndef _WARN_H
+#define _WARN_H
+
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include "elf.h"
+
+extern const char *objname;
+
+static inline char *offstr(struct section *sec, unsigned long offset)
+{
+ struct symbol *func;
+ char *name, *str;
+ unsigned long name_off;
+
+ func = find_containing_func(sec, offset);
+ if (func) {
+ name = func->name;
+ name_off = offset - func->offset;
+ } else {
+ name = sec->name;
+ name_off = offset;
+ }
+
+ str = malloc(strlen(name) + 20);
+
+ if (func)
+ sprintf(str, "%s()+0x%lx", name, name_off);
+ else
+ sprintf(str, "%s+0x%lx", name, name_off);
+
+ return str;
+}
+
+#define WARN(format, ...) \
+ fprintf(stderr, \
+ "%s: warning: objtool: " format "\n", \
+ objname, ##__VA_ARGS__)
+
+#define WARN_FUNC(format, sec, offset, ...) \
+({ \
+ char *_str = offstr(sec, offset); \
+ WARN("%s: " format, _str, ##__VA_ARGS__); \
+ free(_str); \
+})
+
+#define BT_FUNC(format, insn, ...) \
+({ \
+ struct instruction *_insn = (insn); \
+ char *_str = offstr(_insn->sec, _insn->offset); \
+ WARN(" %s: " format, _str, ##__VA_ARGS__); \
+ free(_str); \
+})
+
+#define WARN_ELF(format, ...) \
+ WARN(format ": %s", ##__VA_ARGS__, elf_errmsg(-1))
+
+#endif /* _WARN_H */