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objtool: Do not assume order of parent/child functions

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If a .cold function is examined prior to it's parent, the link
to the parent/child function can be overwritten when the parent
is examined. Only update pfunc and cfunc if they were previously
nil to prevent this from happening.

This fixes an issue seen when compiling with -ffunction-sections.

Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
This commit is contained in:
Kristen Carlson Accardi 2020-04-15 14:04:43 -07:00 committed by Josh Poimboeuf
parent 0decf1f8de
commit e000acc145
1 changed files with 7 additions and 1 deletions
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8
tools/objtool/elf.c
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@ -434,7 +434,13 @@ static int read_symbols(struct elf *elf)
size_t pnamelen;
if (sym->type != STT_FUNC)
continue;
sym->pfunc = sym->cfunc = sym;
if (sym->pfunc == NULL)
sym->pfunc = sym;
if (sym->cfunc == NULL)
sym->cfunc = sym;
coldstr = strstr(sym->name, ".cold");
if (!coldstr)
continue;