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| author | Ard Biesheuvel <ardb@kernel.org> | 2020-09-14 11:24:37 +0300 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2020-10-28 16:59:43 +0100 |
| commit | 22f2d23098f7d34fc5142531cffb241d14611684 (patch) | |
| tree | d6abcefd96fe61aa0c89e6f648d8d08ddb7a6591 /arch/arm/kernel/module.c | |
| parent | 0b1674638a5c69cbace63278625c199100955490 (diff) | |
| download | linux-22f2d23098f7d34fc5142531cffb241d14611684.tar.gz linux-22f2d23098f7d34fc5142531cffb241d14611684.tar.bz2 linux-22f2d23098f7d34fc5142531cffb241d14611684.zip | |
ARM: module: add support for place relative relocations
When using the new adr_l/ldr_l/str_l macros to refer to external symbols
from modules, the linker may emit place relative ELF relocations that
need to be fixed up by the module loader. So add support for these.
Reviewed-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'arch/arm/kernel/module.c')
| -rw-r--r-- | arch/arm/kernel/module.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c index e15444b25ca0..beac45e89ba6 100644 --- a/arch/arm/kernel/module.c +++ b/arch/arm/kernel/module.c @@ -185,14 +185,24 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, *(u32 *)loc |= offset & 0x7fffffff; break; + case R_ARM_REL32: + *(u32 *)loc += sym->st_value - loc; + break; + case R_ARM_MOVW_ABS_NC: case R_ARM_MOVT_ABS: + case R_ARM_MOVW_PREL_NC: + case R_ARM_MOVT_PREL: offset = tmp = __mem_to_opcode_arm(*(u32 *)loc); offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff); offset = (offset ^ 0x8000) - 0x8000; offset += sym->st_value; - if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS) + if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_PREL || + ELF32_R_TYPE(rel->r_info) == R_ARM_MOVW_PREL_NC) + offset -= loc; + if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS || + ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_PREL) offset >>= 16; tmp &= 0xfff0f000; @@ -283,6 +293,8 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, case R_ARM_THM_MOVW_ABS_NC: case R_ARM_THM_MOVT_ABS: + case R_ARM_THM_MOVW_PREL_NC: + case R_ARM_THM_MOVT_PREL: upper = __mem_to_opcode_thumb16(*(u16 *)loc); lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2)); @@ -302,7 +314,11 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, offset = (offset ^ 0x8000) - 0x8000; offset += sym->st_value; - if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS) + if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_PREL || + ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVW_PREL_NC) + offset -= loc; + if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS || + ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_PREL) offset >>= 16; upper = (u16)((upper & 0xfbf0) | |