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| author | Peter Zijlstra <peterz@infradead.org> | 2020-06-12 16:05:26 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-06-18 17:36:33 +0200 |
| commit | 0f1441b44e823a74f3f3780902a113e07c73fbf6 (patch) | |
| tree | 5ef3755754810974096c758d5878dc31d23d7c20 /tools/objtool/arch/x86/include | |
| parent | fdabdd0b05e0bdf232340d5da86563ed142a99a7 (diff) | |
| download | linux-0f1441b44e823a74f3f3780902a113e07c73fbf6.tar.bz2 | |
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/x86/include')
| -rw-r--r-- | tools/objtool/arch/x86/include/arch_elf.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/objtool/arch/x86/include/arch_elf.h b/tools/objtool/arch/x86/include/arch_elf.h new file mode 100644 index 000000000000..69cc4264b28a --- /dev/null +++ b/tools/objtool/arch/x86/include/arch_elf.h @@ -0,0 +1,6 @@ +#ifndef _OBJTOOL_ARCH_ELF +#define _OBJTOOL_ARCH_ELF + +#define R_NONE R_X86_64_NONE + +#endif /* _OBJTOOL_ARCH_ELF */ |