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| author | Youling Tang <tangyouling@loongson.cn> | 2023-02-25 10:52:56 +0300 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2023-02-25 17:12:16 +0300 |
| commit | d8da19fbdedd5852592fbba18a7348e3f09500e6 (patch) | |
| tree | a6a4a921da97d0b7379e9034532c8267a14b631e /arch/loongarch/include/asm/asmmacro.h | |
| parent | 396233c650084cb957eb6d87dd4abd3e56a7d499 (diff) | |
| download | linux-d8da19fbdedd5852592fbba18a7348e3f09500e6.tar.xz | |
LoongArch: Add support for kernel relocation
This config allows to compile kernel as PIE and to relocate it at any
virtual address at runtime: this paves the way to KASLR.
Runtime relocation is possible since relocation metadata are embedded
into the kernel.
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Xi Ruoyao <xry111@xry111.site> # Use arch_initcall
Signed-off-by: Jinyang He <hejinyang@loongson.cn> # Provide la_abs relocation code
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/include/asm/asmmacro.h')
| -rw-r--r-- | arch/loongarch/include/asm/asmmacro.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/asmmacro.h b/arch/loongarch/include/asm/asmmacro.h index cdc9935d5554..c51a1b43acb4 100644 --- a/arch/loongarch/include/asm/asmmacro.h +++ b/arch/loongarch/include/asm/asmmacro.h @@ -275,7 +275,20 @@ .endm .macro la_abs reg, sym +#ifndef CONFIG_RELOCATABLE la.abs \reg, \sym +#else + 766: + lu12i.w \reg, 0 + ori \reg, \reg, 0 + lu32i.d \reg, 0 + lu52i.d \reg, \reg, 0 + .pushsection ".la_abs", "aw", %progbits + 768: + .dword 768b-766b + .dword \sym + .popsection +#endif .endm #endif /* _ASM_ASMMACRO_H */ |