diff options
author | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2014-04-30 18:54:36 +0900 |
---|---|---|
committer | Mark Brown <broonie@linaro.org> | 2014-05-30 18:15:44 +0100 |
commit | 1bda9b270a49edbe30c77f1ba160e6535a568d60 (patch) | |
tree | 5ccfed262741f6f49910404b28c4543d43067f5a /arch/arm64/include | |
parent | ea76465b82b819230ab16ab8ab1b460c09ed5b3b (diff) |
arm64: ftrace: Add system call tracepoint
This patch allows system call entry or exit to be traced as ftrace events,
ie. sys_enter_*/sys_exit_*, if CONFIG_FTRACE_SYSCALLS is enabled.
Those events appear and can be controlled under
${sysfs}/tracing/events/syscalls/
Please note that we can't trace compat system calls here because
AArch32 mode does not share the same syscall table with AArch64.
Just define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS in order to avoid unexpected
results (bogus syscalls reported or even hang-up).
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'arch/arm64/include')
-rw-r--r-- | arch/arm64/include/asm/ftrace.h | 18 | ||||
-rw-r--r-- | arch/arm64/include/asm/syscall.h | 1 | ||||
-rw-r--r-- | arch/arm64/include/asm/unistd.h | 2 |
3 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h index 41e8670db20f..c5534facf941 100644 --- a/arch/arm64/include/asm/ftrace.h +++ b/arch/arm64/include/asm/ftrace.h @@ -17,6 +17,8 @@ #define MCOUNT_INSN_SIZE AARCH64_INSN_SIZE #ifndef __ASSEMBLY__ +#include <linux/compat.h> + extern void _mcount(unsigned long); extern void *return_address(unsigned int); @@ -36,6 +38,22 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr) } #define ftrace_return_address(n) return_address(n) + +/* + * Because AArch32 mode does not share the same syscall table with AArch64, + * tracing compat syscalls may result in reporting bogus syscalls or even + * hang-up, so just do not trace them. + * See kernel/trace/trace_syscalls.c + * + * x86 code says: + * If the user realy wants these, then they should use the + * raw syscall tracepoints with filtering. + */ +#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS +static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) +{ + return is_compat_task(); +} #endif /* ifndef __ASSEMBLY__ */ #endif /* __ASM_FTRACE_H */ diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h index 89c047f9a971..d2552535541d 100644 --- a/arch/arm64/include/asm/syscall.h +++ b/arch/arm64/include/asm/syscall.h @@ -18,6 +18,7 @@ #include <linux/err.h> +extern const void *sys_call_table[]; static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h index 82ce217e94cf..c335479c2638 100644 --- a/arch/arm64/include/asm/unistd.h +++ b/arch/arm64/include/asm/unistd.h @@ -28,3 +28,5 @@ #endif #define __ARCH_WANT_SYS_CLONE #include <uapi/asm/unistd.h> + +#define NR_syscalls (__NR_syscalls) |