On Tue, Jun 20, 2023 at 5:05 AM Masahiro Yamada <masahiroy@xxxxxxxxxx> wrote:
>
> All the addend_*_rel() functions calculate the instruction location in
> the same way.
>
> Factor out the similar code to the caller. Squash reloc_location() too.
>
> Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
> ---
>
> scripts/mod/modpost.c | 28 ++++++++++++----------------
> 1 file changed, 12 insertions(+), 16 deletions(-)
>
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 6e0b8be32648..2551ac9d5bd3 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -1256,16 +1256,9 @@ static void check_section_mismatch(struct module *mod, struct elf_info *elf,
> tosec, taddr);
> }
>
> -static unsigned int *reloc_location(struct elf_info *elf,
> - Elf_Shdr *sechdr, Elf_Rela *r)
> -{
> - return sym_get_data_by_offset(elf, sechdr->sh_info, r->r_offset);
> -}
> -
> -static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
> +static int addend_386_rel(uint32_t *location, Elf_Rela *r)
> {
> unsigned int r_typ = ELF_R_TYPE(r->r_info);
> - unsigned int *location = reloc_location(elf, sechdr, r);
>
> switch (r_typ) {
> case R_386_32:
> @@ -1302,11 +1295,10 @@ static int32_t sign_extend32(int32_t value, int index)
> return (int32_t)(value << shift) >> shift;
> }
>
> -static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
> +static int addend_arm_rel(void *loc, struct elf_info *elf, Elf_Rela *r)
> {
> unsigned int r_typ = ELF_R_TYPE(r->r_info);
> Elf_Sym *sym = elf->symtab_start + ELF_R_SYM(r->r_info);
> - void *loc = reloc_location(elf, sechdr, r);
> uint32_t inst, upper, lower, sign, j1, j2;
> int32_t offset;
>
> @@ -1396,11 +1388,10 @@ static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
> return 0;
> }
>
> -static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
> +static int addend_mips_rel(uint32_t *location, Elf_Rela *r)
> {
> unsigned int r_typ = ELF_R_TYPE(r->r_info);
> - unsigned int *location = reloc_location(elf, sechdr, r);
> - unsigned int inst;
> + uint32_t inst;
>
> if (r_typ == R_MIPS_HI16)
> return 1; /* skip this */
> @@ -1502,6 +1493,8 @@ static void section_rel(struct module *mod, struct elf_info *elf,
> return;
>
> for (rel = start; rel < stop; rel++) {
> + void *loc;
> +
> r.r_offset = TO_NATIVE(rel->r_offset);
> #if KERNEL_ELFCLASS == ELFCLASS64
> if (elf->hdr->e_machine == EM_MIPS) {
> @@ -1519,17 +1512,20 @@ static void section_rel(struct module *mod, struct elf_info *elf,
> r_sym = ELF_R_SYM(r.r_info);
> #endif
> r.r_addend = 0;
> +
> + loc = sym_get_data_by_offset(elf, fsecndx, r.r_offset);
Can we compute `loc` only for the three machine types?
> +
> switch (elf->hdr->e_machine) {
> case EM_386:
> - if (addend_386_rel(elf, sechdr, &r))
> + if (addend_386_rel(loc, &r))
> continue;
> break;
> case EM_ARM:
> - if (addend_arm_rel(elf, sechdr, &r))
> + if (addend_arm_rel(loc, elf, &r))
> continue;
> break;
> case EM_MIPS:
> - if (addend_mips_rel(elf, sechdr, &r))
> + if (addend_mips_rel(loc, &r))
> continue;
> break;
> default:
> --
> 2.39.2
>
--
Thanks,
~Nick Desaulniers
