zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/arch/arm/kernel/entry-common.S b/ap/os/linux/linux-3.4.x/arch/arm/kernel/entry-common.S
new file mode 100644
index 0000000..54ee265
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/arch/arm/kernel/entry-common.S
@@ -0,0 +1,656 @@
+/*
+ * linux/arch/arm/kernel/entry-common.S
+ *
+ * Copyright (C) 2000 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <asm/unistd.h>
+#include <asm/ftrace.h>
+#include <asm/unwind.h>
+
+#ifdef CONFIG_NEED_RET_TO_USER
+#include <mach/entry-macro.S>
+#else
+ .macro arch_ret_to_user, tmp1, tmp2
+ .endm
+#endif
+
+#include "entry-header.S"
+
+
+ .align 5
+/*
+ * This is the fast syscall return path. We do as little as
+ * possible here, and this includes saving r0 back into the SVC
+ * stack.
+ */
+ret_fast_syscall:
+ UNWIND(.fnstart )
+ UNWIND(.cantunwind )
+ disable_irq @ disable interrupts
+ ldr r1, [tsk, #TI_FLAGS]
+ tst r1, #_TIF_WORK_MASK
+ bne fast_work_pending
+#if defined(CONFIG_IRQSOFF_TRACER)
+ asm_trace_hardirqs_on
+#endif
+
+ /* perform architecture specific actions before user return */
+ arch_ret_to_user r1, lr
+
+ restore_user_regs fast = 1, offset = S_OFF
+ UNWIND(.fnend )
+
+/*
+ * Ok, we need to do extra processing, enter the slow path.
+ */
+fast_work_pending:
+ str r0, [sp, #S_R0+S_OFF]! @ returned r0
+work_pending:
+ tst r1, #_TIF_NEED_RESCHED
+ bne work_resched
+ tst r1, #_TIF_SIGPENDING|_TIF_NOTIFY_RESUME
+ beq no_work_pending
+ mov r0, sp @ 'regs'
+ mov r2, why @ 'syscall'
+ tst r1, #_TIF_SIGPENDING @ delivering a signal?
+ movne why, #0 @ prevent further restarts
+ bl do_notify_resume
+ b ret_slow_syscall @ Check work again
+
+work_resched:
+ bl schedule
+/*
+ * "slow" syscall return path. "why" tells us if this was a real syscall.
+ */
+ENTRY(ret_to_user)
+ret_slow_syscall:
+ disable_irq @ disable interrupts
+ENTRY(ret_to_user_from_irq)
+ ldr r1, [tsk, #TI_FLAGS]
+ tst r1, #_TIF_WORK_MASK
+ bne work_pending
+no_work_pending:
+#if defined(CONFIG_IRQSOFF_TRACER)
+ asm_trace_hardirqs_on
+#endif
+ /* perform architecture specific actions before user return */
+ arch_ret_to_user r1, lr
+
+ restore_user_regs fast = 0, offset = 0
+ENDPROC(ret_to_user_from_irq)
+ENDPROC(ret_to_user)
+
+/*
+ * This is how we return from a fork.
+ */
+ENTRY(ret_from_fork)
+ bl schedule_tail
+ get_thread_info tsk
+ ldr r1, [tsk, #TI_FLAGS] @ check for syscall tracing
+ mov why, #1
+ tst r1, #_TIF_SYSCALL_WORK @ are we tracing syscalls?
+ beq ret_slow_syscall
+ mov r1, sp
+ mov r0, #1 @ trace exit [IP = 1]
+ bl syscall_trace
+ b ret_slow_syscall
+ENDPROC(ret_from_fork)
+
+ .equ NR_syscalls,0
+#define CALL(x) .equ NR_syscalls,NR_syscalls+1
+#include "calls.S"
+#undef CALL
+#define CALL(x) .long x
+
+#ifdef CONFIG_FUNCTION_TRACER
+/*
+ * When compiling with -pg, gcc inserts a call to the mcount routine at the
+ * start of every function. In mcount, apart from the function's address (in
+ * lr), we need to get hold of the function's caller's address.
+ *
+ * Older GCCs (pre-4.4) inserted a call to a routine called mcount like this:
+ *
+ * bl mcount
+ *
+ * These versions have the limitation that in order for the mcount routine to
+ * be able to determine the function's caller's address, an APCS-style frame
+ * pointer (which is set up with something like the code below) is required.
+ *
+ * mov ip, sp
+ * push {fp, ip, lr, pc}
+ * sub fp, ip, #4
+ *
+ * With EABI, these frame pointers are not available unless -mapcs-frame is
+ * specified, and if building as Thumb-2, not even then.
+ *
+ * Newer GCCs (4.4+) solve this problem by introducing a new version of mcount,
+ * with call sites like:
+ *
+ * push {lr}
+ * bl __gnu_mcount_nc
+ *
+ * With these compilers, frame pointers are not necessary.
+ *
+ * mcount can be thought of as a function called in the middle of a subroutine
+ * call. As such, it needs to be transparent for both the caller and the
+ * callee: the original lr needs to be restored when leaving mcount, and no
+ * registers should be clobbered. (In the __gnu_mcount_nc implementation, we
+ * clobber the ip register. This is OK because the ARM calling convention
+ * allows it to be clobbered in subroutines and doesn't use it to hold
+ * parameters.)
+ *
+ * When using dynamic ftrace, we patch out the mcount call by a "mov r0, r0"
+ * for the mcount case, and a "pop {lr}" for the __gnu_mcount_nc case (see
+ * arch/arm/kernel/ftrace.c).
+ */
+
+#ifndef CONFIG_OLD_MCOUNT
+#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4))
+#error Ftrace requires CONFIG_FRAME_POINTER=y with GCC older than 4.4.0.
+#endif
+#endif
+
+.macro mcount_adjust_addr rd, rn
+ bic \rd, \rn, #1 @ clear the Thumb bit if present
+ sub \rd, \rd, #MCOUNT_INSN_SIZE
+.endm
+
+.macro __mcount suffix
+ mcount_enter
+ ldr r0, =ftrace_trace_function
+ ldr r2, [r0]
+ adr r0, .Lftrace_stub
+ cmp r0, r2
+ bne 1f
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ ldr r1, =ftrace_graph_return
+ ldr r2, [r1]
+ cmp r0, r2
+ bne ftrace_graph_caller\suffix
+
+ ldr r1, =ftrace_graph_entry
+ ldr r2, [r1]
+ ldr r0, =ftrace_graph_entry_stub
+ cmp r0, r2
+ bne ftrace_graph_caller\suffix
+#endif
+
+ mcount_exit
+
+1: mcount_get_lr r1 @ lr of instrumented func
+ mcount_adjust_addr r0, lr @ instrumented function
+ adr lr, BSYM(2f)
+ mov pc, r2
+2: mcount_exit
+.endm
+
+.macro __ftrace_caller suffix
+ mcount_enter
+
+ mcount_get_lr r1 @ lr of instrumented func
+ mcount_adjust_addr r0, lr @ instrumented function
+
+ .globl ftrace_call\suffix
+ftrace_call\suffix:
+ bl ftrace_stub
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ .globl ftrace_graph_call\suffix
+ftrace_graph_call\suffix:
+ mov r0, r0
+#endif
+
+ mcount_exit
+.endm
+
+.macro __ftrace_graph_caller
+ sub r0, fp, #4 @ &lr of instrumented routine (&parent)
+#ifdef CONFIG_DYNAMIC_FTRACE
+ @ called from __ftrace_caller, saved in mcount_enter
+ ldr r1, [sp, #16] @ instrumented routine (func)
+ mcount_adjust_addr r1, r1
+#else
+ @ called from __mcount, untouched in lr
+ mcount_adjust_addr r1, lr @ instrumented routine (func)
+#endif
+ mov r2, fp @ frame pointer
+ bl prepare_ftrace_return
+ mcount_exit
+.endm
+
+#ifdef CONFIG_OLD_MCOUNT
+/*
+ * mcount
+ */
+
+.macro mcount_enter
+ stmdb sp!, {r0-r3, lr}
+.endm
+
+.macro mcount_get_lr reg
+ ldr \reg, [fp, #-4]
+.endm
+
+.macro mcount_exit
+ ldr lr, [fp, #-4]
+ ldmia sp!, {r0-r3, pc}
+.endm
+
+ENTRY(mcount)
+#ifdef CONFIG_DYNAMIC_FTRACE
+ stmdb sp!, {lr}
+ ldr lr, [fp, #-4]
+ ldmia sp!, {pc}
+#else
+ __mcount _old
+#endif
+ENDPROC(mcount)
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+ENTRY(ftrace_caller_old)
+ __ftrace_caller _old
+ENDPROC(ftrace_caller_old)
+#endif
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ENTRY(ftrace_graph_caller_old)
+ __ftrace_graph_caller
+ENDPROC(ftrace_graph_caller_old)
+#endif
+
+.purgem mcount_enter
+.purgem mcount_get_lr
+.purgem mcount_exit
+#endif
+
+/*
+ * __gnu_mcount_nc
+ */
+
+.macro mcount_enter
+ stmdb sp!, {r0-r3, lr}
+.endm
+
+.macro mcount_get_lr reg
+ ldr \reg, [sp, #20]
+.endm
+
+.macro mcount_exit
+ ldmia sp!, {r0-r3, ip, lr}
+ mov pc, ip
+.endm
+
+ENTRY(__gnu_mcount_nc)
+#ifdef CONFIG_DYNAMIC_FTRACE
+ mov ip, lr
+ ldmia sp!, {lr}
+ mov pc, ip
+#else
+ __mcount
+#endif
+ENDPROC(__gnu_mcount_nc)
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+ENTRY(ftrace_caller)
+ __ftrace_caller
+ENDPROC(ftrace_caller)
+#endif
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ENTRY(ftrace_graph_caller)
+ __ftrace_graph_caller
+ENDPROC(ftrace_graph_caller)
+#endif
+
+.purgem mcount_enter
+.purgem mcount_get_lr
+.purgem mcount_exit
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ .globl return_to_handler
+return_to_handler:
+ stmdb sp!, {r0-r3}
+ mov r0, fp @ frame pointer
+ bl ftrace_return_to_handler
+ mov lr, r0 @ r0 has real ret addr
+ ldmia sp!, {r0-r3}
+ mov pc, lr
+#endif
+
+ENTRY(ftrace_stub)
+.Lftrace_stub:
+ mov pc, lr
+ENDPROC(ftrace_stub)
+
+#endif /* CONFIG_FUNCTION_TRACER */
+
+/*=============================================================================
+ * SWI handler
+ *-----------------------------------------------------------------------------
+ */
+
+ /* If we're optimising for StrongARM the resulting code won't
+ run on an ARM7 and we can save a couple of instructions.
+ --pb */
+#ifdef CONFIG_CPU_ARM710
+#define A710(code...) code
+.Larm710bug:
+ ldmia sp, {r0 - lr}^ @ Get calling r0 - lr
+ mov r0, r0
+ add sp, sp, #S_FRAME_SIZE
+ subs pc, lr, #4
+#else
+#define A710(code...)
+#endif
+
+ .align 5
+ENTRY(vector_swi)
+ sub sp, sp, #S_FRAME_SIZE
+ stmia sp, {r0 - r12} @ Calling r0 - r12
+ ARM( add r8, sp, #S_PC )
+ ARM( stmdb r8, {sp, lr}^ ) @ Calling sp, lr
+ THUMB( mov r8, sp )
+ THUMB( store_user_sp_lr r8, r10, S_SP ) @ calling sp, lr
+ mrs r8, spsr @ called from non-FIQ mode, so ok.
+ str lr, [sp, #S_PC] @ Save calling PC
+ str r8, [sp, #S_PSR] @ Save CPSR
+ str r0, [sp, #S_OLD_R0] @ Save OLD_R0
+ zero_fp
+
+ /*
+ * Get the system call number.
+ */
+
+#if defined(CONFIG_OABI_COMPAT)
+
+ /*
+ * If we have CONFIG_OABI_COMPAT then we need to look at the swi
+ * value to determine if it is an EABI or an old ABI call.
+ */
+#ifdef CONFIG_ARM_THUMB
+ tst r8, #PSR_T_BIT
+ movne r10, #0 @ no thumb OABI emulation
+ ldreq r10, [lr, #-4] @ get SWI instruction
+#else
+ ldr r10, [lr, #-4] @ get SWI instruction
+ A710( and ip, r10, #0x0f000000 @ check for SWI )
+ A710( teq ip, #0x0f000000 )
+ A710( bne .Larm710bug )
+#endif
+#ifdef CONFIG_CPU_ENDIAN_BE8
+ rev r10, r10 @ little endian instruction
+#endif
+
+#elif defined(CONFIG_AEABI)
+
+ /*
+ * Pure EABI user space always put syscall number into scno (r7).
+ */
+ A710( ldr ip, [lr, #-4] @ get SWI instruction )
+ A710( and ip, ip, #0x0f000000 @ check for SWI )
+ A710( teq ip, #0x0f000000 )
+ A710( bne .Larm710bug )
+
+#elif defined(CONFIG_ARM_THUMB)
+
+ /* Legacy ABI only, possibly thumb mode. */
+ tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs
+ addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in
+ ldreq scno, [lr, #-4]
+
+#else
+
+ /* Legacy ABI only. */
+ ldr scno, [lr, #-4] @ get SWI instruction
+ A710( and ip, scno, #0x0f000000 @ check for SWI )
+ A710( teq ip, #0x0f000000 )
+ A710( bne .Larm710bug )
+
+#endif
+
+#ifdef CONFIG_ALIGNMENT_TRAP
+ ldr ip, __cr_alignment
+ ldr ip, [ip]
+ mcr p15, 0, ip, c1, c0 @ update control register
+#endif
+ enable_irq
+
+ get_thread_info tsk
+ adr tbl, sys_call_table @ load syscall table pointer
+
+#if defined(CONFIG_OABI_COMPAT)
+ /*
+ * If the swi argument is zero, this is an EABI call and we do nothing.
+ *
+ * If this is an old ABI call, get the syscall number into scno and
+ * get the old ABI syscall table address.
+ */
+ bics r10, r10, #0xff000000
+ eorne scno, r10, #__NR_OABI_SYSCALL_BASE
+ ldrne tbl, =sys_oabi_call_table
+#elif !defined(CONFIG_AEABI)
+ bic scno, scno, #0xff000000 @ mask off SWI op-code
+ eor scno, scno, #__NR_SYSCALL_BASE @ check OS number
+#endif
+
+ ldr r10, [tsk, #TI_FLAGS] @ check for syscall tracing
+ stmdb sp!, {r4, r5} @ push fifth and sixth args
+
+#ifdef CONFIG_SECCOMP
+ tst r10, #_TIF_SECCOMP
+ beq 1f
+ mov r0, scno
+ bl __secure_computing
+ add r0, sp, #S_R0 + S_OFF @ pointer to regs
+ ldmia r0, {r0 - r3} @ have to reload r0 - r3
+1:
+#endif
+
+ tst r10, #_TIF_SYSCALL_WORK @ are we tracing syscalls?
+ bne __sys_trace
+
+ cmp scno, #NR_syscalls @ check upper syscall limit
+ adr lr, BSYM(ret_fast_syscall) @ return address
+ ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine
+
+ add r1, sp, #S_OFF
+2: mov why, #0 @ no longer a real syscall
+ cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE)
+ eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back
+ bcs arm_syscall
+ b sys_ni_syscall @ not private func
+ENDPROC(vector_swi)
+
+ /*
+ * This is the really slow path. We're going to be doing
+ * context switches, and waiting for our parent to respond.
+ */
+__sys_trace:
+ mov r2, scno
+ add r1, sp, #S_OFF
+ mov r0, #0 @ trace entry [IP = 0]
+ bl syscall_trace
+
+ adr lr, BSYM(__sys_trace_return) @ return address
+ mov scno, r0 @ syscall number (possibly new)
+ add r1, sp, #S_R0 + S_OFF @ pointer to regs
+ cmp scno, #NR_syscalls @ check upper syscall limit
+ ldmccia r1, {r0 - r3} @ have to reload r0 - r3
+ ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine
+ b 2b
+
+__sys_trace_return:
+ str r0, [sp, #S_R0 + S_OFF]! @ save returned r0
+ mov r2, scno
+ mov r1, sp
+ mov r0, #1 @ trace exit [IP = 1]
+ bl syscall_trace
+ b ret_slow_syscall
+
+ .align 5
+#ifdef CONFIG_ALIGNMENT_TRAP
+ .type __cr_alignment, #object
+__cr_alignment:
+ .word cr_alignment
+#endif
+ .ltorg
+
+/*
+ * This is the syscall table declaration for native ABI syscalls.
+ * With EABI a couple syscalls are obsolete and defined as sys_ni_syscall.
+ */
+#define ABI(native, compat) native
+#ifdef CONFIG_AEABI
+#define OBSOLETE(syscall) sys_ni_syscall
+#else
+#define OBSOLETE(syscall) syscall
+#endif
+
+ .type sys_call_table, #object
+ENTRY(sys_call_table)
+#include "calls.S"
+#undef ABI
+#undef OBSOLETE
+
+/*============================================================================
+ * Special system call wrappers
+ */
+@ r0 = syscall number
+@ r8 = syscall table
+sys_syscall:
+ bic scno, r0, #__NR_OABI_SYSCALL_BASE
+ cmp scno, #__NR_syscall - __NR_SYSCALL_BASE
+ cmpne scno, #NR_syscalls @ check range
+ stmloia sp, {r5, r6} @ shuffle args
+ movlo r0, r1
+ movlo r1, r2
+ movlo r2, r3
+ movlo r3, r4
+ ldrlo pc, [tbl, scno, lsl #2]
+ b sys_ni_syscall
+ENDPROC(sys_syscall)
+
+sys_fork_wrapper:
+ add r0, sp, #S_OFF
+ b sys_fork
+ENDPROC(sys_fork_wrapper)
+
+sys_vfork_wrapper:
+ add r0, sp, #S_OFF
+ b sys_vfork
+ENDPROC(sys_vfork_wrapper)
+
+sys_execve_wrapper:
+ add r3, sp, #S_OFF
+ b sys_execve
+ENDPROC(sys_execve_wrapper)
+
+sys_clone_wrapper:
+ add ip, sp, #S_OFF
+ str ip, [sp, #4]
+ b sys_clone
+ENDPROC(sys_clone_wrapper)
+
+sys_sigreturn_wrapper:
+ add r0, sp, #S_OFF
+ mov why, #0 @ prevent syscall restart handling
+ b sys_sigreturn
+ENDPROC(sys_sigreturn_wrapper)
+
+sys_rt_sigreturn_wrapper:
+ add r0, sp, #S_OFF
+ mov why, #0 @ prevent syscall restart handling
+ b sys_rt_sigreturn
+ENDPROC(sys_rt_sigreturn_wrapper)
+
+sys_sigaltstack_wrapper:
+ ldr r2, [sp, #S_OFF + S_SP]
+ b do_sigaltstack
+ENDPROC(sys_sigaltstack_wrapper)
+
+sys_statfs64_wrapper:
+ teq r1, #88
+ moveq r1, #84
+ b sys_statfs64
+ENDPROC(sys_statfs64_wrapper)
+
+sys_fstatfs64_wrapper:
+ teq r1, #88
+ moveq r1, #84
+ b sys_fstatfs64
+ENDPROC(sys_fstatfs64_wrapper)
+
+/*
+ * Note: off_4k (r5) is always units of 4K. If we can't do the requested
+ * offset, we return EINVAL.
+ */
+sys_mmap2:
+#if PAGE_SHIFT > 12
+ tst r5, #PGOFF_MASK
+ moveq r5, r5, lsr #PAGE_SHIFT - 12
+ streq r5, [sp, #4]
+ beq sys_mmap_pgoff
+ mov r0, #-EINVAL
+ mov pc, lr
+#else
+ str r5, [sp, #4]
+ b sys_mmap_pgoff
+#endif
+ENDPROC(sys_mmap2)
+
+#ifdef CONFIG_OABI_COMPAT
+
+/*
+ * These are syscalls with argument register differences
+ */
+
+sys_oabi_pread64:
+ stmia sp, {r3, r4}
+ b sys_pread64
+ENDPROC(sys_oabi_pread64)
+
+sys_oabi_pwrite64:
+ stmia sp, {r3, r4}
+ b sys_pwrite64
+ENDPROC(sys_oabi_pwrite64)
+
+sys_oabi_truncate64:
+ mov r3, r2
+ mov r2, r1
+ b sys_truncate64
+ENDPROC(sys_oabi_truncate64)
+
+sys_oabi_ftruncate64:
+ mov r3, r2
+ mov r2, r1
+ b sys_ftruncate64
+ENDPROC(sys_oabi_ftruncate64)
+
+sys_oabi_readahead:
+ str r3, [sp]
+ mov r3, r2
+ mov r2, r1
+ b sys_readahead
+ENDPROC(sys_oabi_readahead)
+
+/*
+ * Let's declare a second syscall table for old ABI binaries
+ * using the compatibility syscall entries.
+ */
+#define ABI(native, compat) compat
+#define OBSOLETE(syscall) syscall
+
+ .type sys_oabi_call_table, #object
+ENTRY(sys_oabi_call_table)
+#include "calls.S"
+#undef ABI
+#undef OBSOLETE
+
+#endif
+