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objtool: Extract elf_strtab_concat() 

Create a common helper to append strings to a strtab.

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/20210326151259.941474004@infradead.org
This commit is contained in:
Peter Zijlstra 2021-03-26 16:12:09 +01:00 committed by Ingo Molnar
parent d0c5c4cc73
commit 417a4dc91e
1 changed files with 38 additions and 22 deletions
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60
tools/objtool/elf.c
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@ -673,13 +673,48 @@ struct elf *elf_open_read(const char *name, int flags)
return NULL;
}
static int elf_add_string(struct elf *elf, struct section *strtab, char *str)
{
Elf_Data *data;
Elf_Scn *s;
int len;
if (!strtab)
strtab = find_section_by_name(elf, ".strtab");
if (!strtab) {
WARN("can't find .strtab section");
return -1;
}
s = elf_getscn(elf->elf, strtab->idx);
if (!s) {
WARN_ELF("elf_getscn");
return -1;
}
data = elf_newdata(s);
if (!data) {
WARN_ELF("elf_newdata");
return -1;
}
data->d_buf = str;
data->d_size = strlen(str) + 1;
data->d_align = 1;
len = strtab->len;
strtab->len += data->d_size;
strtab->changed = true;
return len;
}
struct section *elf_create_section(struct elf *elf, const char *name,
unsigned int sh_flags, size_t entsize, int nr)
{
struct section *sec, *shstrtab;
size_t size = entsize * nr;
Elf_Scn *s;
Elf_Data *data;
sec = malloc(sizeof(*sec));
if (!sec) {
@ -736,7 +771,6 @@ struct section *elf_create_section(struct elf *elf, const char *name,
sec->sh.sh_addralign = 1;
sec->sh.sh_flags = SHF_ALLOC | sh_flags;
/* Add section name to .shstrtab (or .strtab for Clang) */
shstrtab = find_section_by_name(elf, ".shstrtab");
if (!shstrtab)
@ -745,27 +779,9 @@ struct section *elf_create_section(struct elf *elf, const char *name,
WARN("can't find .shstrtab or .strtab section");
return NULL;
}
s = elf_getscn(elf->elf, shstrtab->idx);
if (!s) {
WARN_ELF("elf_getscn");
sec->sh.sh_name = elf_add_string(elf, shstrtab, sec->name);
if (sec->sh.sh_name == -1)
return NULL;
}
data = elf_newdata(s);
if (!data) {
WARN_ELF("elf_newdata");
return NULL;
}
data->d_buf = sec->name;
data->d_size = strlen(name) + 1;
data->d_align = 1;
sec->sh.sh_name = shstrtab->len;
shstrtab->len += strlen(name) + 1;
shstrtab->changed = true;
list_add_tail(&sec->list, &elf->sections);
elf_hash_add(elf->section_hash, &sec->hash, sec->idx);