diff options
| author | Peter Zijlstra | 2020-06-12 16:05:26 +0200 |
|---|---|---|
| committer | Peter Zijlstra | 2020-06-18 17:36:33 +0200 |
| commit | 0f1441b44e823a74f3f3780902a113e07c73fbf6 (patch) | |
| tree | 5ef3755754810974096c758d5878dc31d23d7c20 /tools/objtool/arch.h | |
| parent | fdabdd0b05e0bdf232340d5da86563ed142a99a7 (diff) | |
objtool: Fix noinstr vs KCOV
Since many compilers cannot disable KCOV with a function attribute,
help it to NOP out any __sanitizer_cov_*() calls injected in noinstr
code.
This turns:
12: e8 00 00 00 00 callq 17 <lockdep_hardirqs_on+0x17>
13: R_X86_64_PLT32 __sanitizer_cov_trace_pc-0x4
into:
12: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
13: R_X86_64_NONE __sanitizer_cov_trace_pc-0x4
Just like recordmcount does.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Diffstat (limited to 'tools/objtool/arch.h')
| -rw-r--r-- | tools/objtool/arch.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/objtool/arch.h b/tools/objtool/arch.h index eda15a5a285e..3c5967748abb 100644 --- a/tools/objtool/arch.h +++ b/tools/objtool/arch.h @@ -84,4 +84,6 @@ unsigned long arch_jump_destination(struct instruction *insn); unsigned long arch_dest_rela_offset(int addend); +const char *arch_nop_insn(int len); + #endif /* _ARCH_H */ |