Messages in this thread Patch in this message | | | From | Josh Poimboeuf <> | Subject | [PATCH 4/5] objtool: Fix switch table detection in .text.unlikely | Date | Wed, 1 Apr 2020 13:23:28 -0500 |
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If a switch jump table's indirect branch is in a ".cold" subfunction in .text.unlikely, objtool doesn't detect it, and instead prints a false warning:
drivers/media/v4l2-core/v4l2-ioctl.o: warning: objtool: v4l_print_format.cold()+0xd6: sibling call from callable instruction with modified stack frame drivers/hwmon/max6650.o: warning: objtool: max6650_probe.cold()+0xa5: sibling call from callable instruction with modified stack frame drivers/media/dvb-frontends/drxk_hard.o: warning: objtool: init_drxk.cold()+0x16f: sibling call from callable instruction with modified stack frame
Fix it by comparing the function, instead of the section and offset.
Fixes: 13810435b9a7 ("objtool: Support GCC 8's cold subfunctions") Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> --- tools/objtool/check.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index aaec5e1277ea..c681a26c25ac 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -1068,10 +1068,7 @@ static struct rela *find_jump_table(struct objtool_file *file, * it. */ for (; - &insn->list != &file->insn_list && - insn->sec == func->sec && - insn->offset >= func->offset; - + &insn->list != &file->insn_list && insn->func && insn->func->pfunc == func; insn = insn->first_jump_src ?: list_prev_entry(insn, list)) { if (insn != orig_insn && insn->type == INSN_JUMP_DYNAMIC) -- 2.21.1
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