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| author | Peter Zijlstra <peterz@infradead.org> | 2021-05-06 21:34:03 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2021-05-12 14:54:56 +0200 |
| commit | 6d37b83c5d79ef5996cc49c3e3ac3d8ecd8c7050 (patch) | |
| tree | 1432c860d584cab33eb9d9c253bd7a819c108c1a /tools/objtool/check.c | |
| parent | cbf82a3dc241aea82b941a872ed5c52f6af527ea (diff) | |
| download | linux-6d37b83c5d79ef5996cc49c3e3ac3d8ecd8c7050.tar.gz | |
objtool: Rewrite jump_label instructions
When a jump_entry::key has bit1 set, rewrite the instruction to be a NOP. This allows the compiler/assembler to emit JMP (and thus decide on which encoding to use). Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20210506194158.091028792@infradead.org
Diffstat (limited to 'tools/objtool/check.c')
| -rw-r--r-- | tools/objtool/check.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 9ed1a4cd00dc..98cf87f2c501 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -1234,6 +1234,20 @@ static int handle_jump_alt(struct objtool_file *file, return -1; } + if (special_alt->key_addend & 2) { + struct reloc *reloc = insn_reloc(file, orig_insn); + + if (reloc) { + reloc->type = R_NONE; + elf_write_reloc(file->elf, reloc); + } + elf_write_insn(file->elf, orig_insn->sec, + orig_insn->offset, orig_insn->len, + arch_nop_insn(orig_insn->len)); + orig_insn->type = INSN_NOP; + return 0; + } + *new_insn = list_next_entry(orig_insn, list); return 0; } |