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kpatch/LoongArch: create and process section __patchable_function_entries

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Generate 2 NOPs right at the beginning of each function with
-fpatchable-function-entry=2 in LoongArch. So here create section
__patchable_function_entries and check this situation.

Co-developed-by: zhanghongchen <zhanghongchen@loongson.cn>
Signed-off-by: George Guo <guodongtai@kylinos.cn>
This commit is contained in:
George Guo 2024-09-08 12:17:05 +08:00
parent 9a3d0e9b4e
commit 411bf6c03a
1 changed files with 34 additions and 1 deletions

35
kpatch-build/create-diff-object.c
View File

@ -3706,7 +3706,10 @@ static void kpatch_create_mcount_sections(struct kpatch_elf *kelf)
nr++;
/* create text/rela section pair */
sec = create_section_pair(kelf, "__mcount_loc", sizeof(void*), nr);
if (kelf->arch == LOONGARCH64)
sec = create_section_pair(kelf, "__patchable_function_entries", sizeof(void *), nr);
else
sec = create_section_pair(kelf, "__mcount_loc", sizeof(void *), nr);
relasec = sec->rela;
/* populate sections */
@ -3786,6 +3789,20 @@ static void kpatch_create_mcount_sections(struct kpatch_elf *kelf)
insn_offset = sym->sym.st_value;
break;
}
case LOONGARCH64: {
#define LOONGARCH_NOP 0x03400000
bool found = false;
unsigned int *insn = sym->sec->data->d_buf + sym->sym.st_value;
if (*insn == LOONGARCH_NOP && *(insn + 1) == LOONGARCH_NOP)
found = true;
if (!found)
ERROR("%s: unexpected instruction at the start of the function", sym->name);
insn_offset = 0;
break;
}
default:
ERROR("unsupported arch");
}
@ -3991,6 +4008,22 @@ static void kpatch_find_func_profiling_calls(struct kpatch_elf *kelf)
insn[4] == 0x00 && insn[5] == 0x00)
sym->has_func_profiling = 1;
break;
case LOONGARCH64:
struct section *sec;
sec = find_section_by_name(&kelf->sections,
"__patchable_function_entries");
if (sec) {
list_for_each_entry(rela, &sec->rela->relas, list) {
if (rela->sym->sec == sym->sec &&
(rela->sym->sym.st_value +
rela->addend) == sym->sym.st_value) {
sym->has_func_profiling = 1;
break;
}
}
}
break;
default:
ERROR("unsupported arch");
}