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| author | Mao Han <han_mao@c-sky.com> | 2019-04-10 05:27:10 +0300 |
|---|---|---|
| committer | Guo Ren <ren_guo@c-sky.com> | 2019-04-22 08:44:57 +0300 |
| commit | b4bf274198bd415e66af0b54a2e181c59fd43ba4 (patch) | |
| tree | f517e4c2a1d0b8636e24089188a1fcf0826cf5f1 /arch/csky/include/asm | |
| parent | 981bbf274b64496fd4376b44120d47dae4ca94e8 (diff) | |
| download | linux-b4bf274198bd415e66af0b54a2e181c59fd43ba4.tar.xz | |
csky: Add perf_arch_fetch_caller_regs support
In trace events as tracepoints context are not able to
be retrieve with task_pt_regs. Without arch caller regs
support the pt_regs context will be all zero, perf can
not parsing the callchain and resolving the symbols
correctly, some time will even get into deadlock
while handling the page fault, eg:
perf kmem —page record ls
Changelog
- Add test case cmd in comment
- Use regs_fp(regs) which is defined in abi/regdef.h
Signed-off-by: Mao Han <han_mao@c-sky.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Diffstat (limited to 'arch/csky/include/asm')
| -rw-r--r-- | arch/csky/include/asm/perf_event.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/csky/include/asm/perf_event.h b/arch/csky/include/asm/perf_event.h index ea8193122294..572093e11001 100644 --- a/arch/csky/include/asm/perf_event.h +++ b/arch/csky/include/asm/perf_event.h @@ -4,4 +4,12 @@ #ifndef __ASM_CSKY_PERF_EVENT_H #define __ASM_CSKY_PERF_EVENT_H +#include <abi/regdef.h> + +#define perf_arch_fetch_caller_regs(regs, __ip) { \ + (regs)->pc = (__ip); \ + regs_fp(regs) = (unsigned long) __builtin_frame_address(0); \ + asm volatile("mov %0, sp\n":"=r"((regs)->usp)); \ +} + #endif /* __ASM_PERF_EVENT_ELF_H */ |