diff options
| author | Xi Ruoyao <xry111@xry111.site> | 2022-10-12 16:36:14 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-10-12 16:36:14 +0800 |
| commit | 59b3d4a9b0cc065a6a88446f8dd9b6d4659cc3df (patch) | |
| tree | 1635c79ad548cbffc9da58559874a73d1037e4f9 /arch/loongarch/kernel/module.c | |
| parent | 9bd1e38032fb72982d9efe11948037cfa01eaa50 (diff) | |
| download | linux-59b3d4a9b0cc065a6a88446f8dd9b6d4659cc3df.tar.bz2 | |
LoongArch: Support R_LARCH_GOT_PC_{LO12,HI20} in modules
GCC >= 13 and GNU assembler >= 2.40 use these relocations to address
external symbols, so we need to add them.
Let the module loader emit GOT entries for data symbols so we would be
able to handle GOT relocations. The GOT entry is just the data's symbol
address.
In module.lds, emit a stub .got section for a section header entry. The
actual content of the section entry will be filled at runtime by module_
frob_arch_sections().
Tested-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/kernel/module.c')
| -rw-r--r-- | arch/loongarch/kernel/module.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/module.c b/arch/loongarch/kernel/module.c index 543ab2dc7ba0..bee7457db804 100644 --- a/arch/loongarch/kernel/module.c +++ b/arch/loongarch/kernel/module.c @@ -348,6 +348,29 @@ static int apply_r_larch_pcala(struct module *mod, u32 *location, Elf_Addr v, return 0; } +static int apply_r_larch_got_pc(struct module *mod, u32 *location, Elf_Addr v, + s64 *rela_stack, size_t *rela_stack_top, unsigned int type) +{ + Elf_Addr got = module_emit_got_entry(mod, v); + + if (!got) + return -EINVAL; + + switch (type) { + case R_LARCH_GOT_PC_LO12: + type = R_LARCH_PCALA_LO12; + break; + case R_LARCH_GOT_PC_HI20: + type = R_LARCH_PCALA_HI20; + break; + default: + pr_err("%s: Unsupport relocation type %u\n", mod->name, type); + return -EINVAL; + } + + return apply_r_larch_pcala(mod, location, got, rela_stack, rela_stack_top, type); +} + /* * reloc_handlers_rela() - Apply a particular relocation to a module * @mod: the module to apply the reloc to @@ -379,6 +402,7 @@ static reloc_rela_handler reloc_rela_handlers[] = { [R_LARCH_ADD32 ... R_LARCH_SUB64] = apply_r_larch_add_sub, [R_LARCH_B26] = apply_r_larch_b26, [R_LARCH_PCALA_HI20...R_LARCH_PCALA64_HI12] = apply_r_larch_pcala, + [R_LARCH_GOT_PC_HI20...R_LARCH_GOT_PC_LO12] = apply_r_larch_got_pc, }; int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, |