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objtool: Handle per arch retpoline naming 

The __x86_indirect_ naming is obviously not generic. Shorten to allow
matching some additional magic names later.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/20210326151259.630296706@infradead.org
This commit is contained in:
Peter Zijlstra 2021-03-26 16:12:04 +01:00 committed by Ingo Molnar
parent bcb1b6ff39
commit 530b4ddd9d
3 changed files with 14 additions and 2 deletions
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5
tools/objtool/arch/x86/decode.c
View File

@ -648,3 +648,8 @@ int arch_decode_hint_reg(struct instruction *insn, u8 sp_reg)
return 0;
}
bool arch_is_retpoline(struct symbol *sym)
{
return !strncmp(sym->name, "__x86_indirect_", 15);
}

9
tools/objtool/check.c
View File

@ -850,6 +850,11 @@ static int add_ignore_alternatives(struct objtool_file *file)
return 0;
}
__weak bool arch_is_retpoline(struct symbol *sym)
{
return false;
}
/*
* Find the destination instructions for all jumps.
*/
@ -872,7 +877,7 @@ static int add_jump_destinations(struct objtool_file *file)
} else if (reloc->sym->type == STT_SECTION) {
dest_sec = reloc->sym->sec;
dest_off = arch_dest_reloc_offset(reloc->addend);
} else if (!strncmp(reloc->sym->name, "__x86_indirect_thunk_", 21)) {
} else if (arch_is_retpoline(reloc->sym)) {
/*
* Retpoline jumps are really dynamic jumps in
* disguise, so convert them accordingly.
@ -1026,7 +1031,7 @@ static int add_call_destinations(struct objtool_file *file)
return -1;
}
} else if (!strncmp(reloc->sym->name, "__x86_indirect_thunk_", 21)) {
} else if (arch_is_retpoline(reloc->sym)) {
/*
* Retpoline calls are really dynamic calls in
* disguise, so convert them accordingly.

2
tools/objtool/include/objtool/arch.h
View File

@ -86,4 +86,6 @@ const char *arch_nop_insn(int len);
int arch_decode_hint_reg(struct instruction *insn, u8 sp_reg);
bool arch_is_retpoline(struct symbol *sym);
#endif /* _ARCH_H */