| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* |
| 3 | * arch/arm64/include/asm/ftrace.h |
| 4 | * |
| 5 | * Copyright (C) 2013 Linaro Limited |
| 6 | * Author: AKASHI Takahiro <takahiro.akashi@linaro.org> |
| 7 | */ |
| 8 | #ifndef __ASM_FTRACE_H |
| 9 | #define __ASM_FTRACE_H |
| 10 | |
| 11 | #include <asm/insn.h> |
| 12 | |
| 13 | #define HAVE_FUNCTION_GRAPH_FP_TEST |
| 14 | #define MCOUNT_ADDR ((unsigned long)__va_function(_mcount)) |
| 15 | #define MCOUNT_INSN_SIZE AARCH64_INSN_SIZE |
| 16 | |
| 17 | /* |
| 18 | * Currently, gcc tends to save the link register after the local variables |
| 19 | * on the stack. This causes the max stack tracer to report the function |
| 20 | * frame sizes for the wrong functions. By defining |
| 21 | * ARCH_FTRACE_SHIFT_STACK_TRACER, it will tell the stack tracer to expect |
| 22 | * to find the return address on the stack after the local variables have |
| 23 | * been set up. |
| 24 | * |
| 25 | * Note, this may change in the future, and we will need to deal with that |
| 26 | * if it were to happen. |
| 27 | */ |
| 28 | #define ARCH_FTRACE_SHIFT_STACK_TRACER 1 |
| 29 | |
| 30 | #ifndef __ASSEMBLY__ |
| 31 | #include <linux/compat.h> |
| 32 | |
| 33 | extern void _mcount(unsigned long); |
| 34 | extern void *return_address(unsigned int); |
| 35 | |
| 36 | struct dyn_arch_ftrace { |
| 37 | /* No extra data needed for arm64 */ |
| 38 | }; |
| 39 | |
| 40 | extern unsigned long ftrace_graph_call; |
| 41 | |
| 42 | extern void return_to_handler(void); |
| 43 | |
| 44 | static inline unsigned long ftrace_call_adjust(unsigned long addr) |
| 45 | { |
| 46 | /* |
| 47 | * addr is the address of the mcount call instruction. |
| 48 | * recordmcount does the necessary offset calculation. |
| 49 | */ |
| 50 | return addr; |
| 51 | } |
| 52 | |
| 53 | #define ftrace_return_address(n) return_address(n) |
| 54 | |
| 55 | /* |
| 56 | * Because AArch32 mode does not share the same syscall table with AArch64, |
| 57 | * tracing compat syscalls may result in reporting bogus syscalls or even |
| 58 | * hang-up, so just do not trace them. |
| 59 | * See kernel/trace/trace_syscalls.c |
| 60 | * |
| 61 | * x86 code says: |
| 62 | * If the user really wants these, then they should use the |
| 63 | * raw syscall tracepoints with filtering. |
| 64 | */ |
| 65 | #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS |
| 66 | static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) |
| 67 | { |
| 68 | return is_compat_task(); |
| 69 | } |
| 70 | |
| 71 | #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME |
| 72 | |
| 73 | static inline bool arch_syscall_match_sym_name(const char *sym, |
| 74 | const char *name) |
| 75 | { |
| 76 | /* |
| 77 | * Since all syscall functions have __arm64_ prefix, we must skip it. |
| 78 | * However, as we described above, we decided to ignore compat |
| 79 | * syscalls, so we don't care about __arm64_compat_ prefix here. |
| 80 | */ |
| 81 | return !strcmp(sym + 8, name); |
| 82 | } |
| 83 | #endif /* ifndef __ASSEMBLY__ */ |
| 84 | |
| 85 | #endif /* __ASM_FTRACE_H */ |