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objtool,x86: Replace alternatives with .retpoline_sites

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Instead of writing complete alternatives, simply provide a list of all
the retpoline thunk calls. Then the kernel is free to do with them as
it pleases. Simpler code all-round.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Tested-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/r/20211026120309.850007165@infradead.org
This commit is contained in:
Peter Zijlstra
2021-10-26 14:01:36 +02:00
parent c509331b41
commit 134ab5bd18
6 changed files with 107 additions and 252 deletions
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8
tools/objtool/special.c
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@@ -109,14 +109,6 @@ static int get_alt_entry(struct elf *elf, struct special_entry *entry,
return -1;
}
/*
* Skip retpoline .altinstr_replacement... we already rewrite the
* instructions for retpolines anyway, see arch_is_retpoline()
* usage in add_{call,jump}_destinations().
*/
if (arch_is_retpoline(new_reloc->sym))
return 1;
reloc_to_sec_off(new_reloc, &alt->new_sec, &alt->new_off);
/* _ASM_EXTABLE_EX hack */