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LoongArch: Record pc instead of offset in la_abs relocation

Browse Source 
To clarify, the previous version functioned flawlessly. However, it's
worth noting that the LLVM's LoongArch backend currently lacks support
for cross-section label calculations. With this patch, we enable the use
of clang to compile relocatable kernels.

Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: WANG Rui <wangrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
WANG Rui 2023-11-21 15:03:25 +08:00 committed by Huacai Chen
parent cbfd44bd5c
commit aa0cbc1b50
3 changed files with 3 additions and 4 deletions
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3
arch/loongarch/include/asm/asmmacro.h
View File

@ -609,8 +609,7 @@
lu32i.d \reg, 0
lu52i.d \reg, \reg, 0
.pushsection ".la_abs", "aw", %progbits
768:
.dword 768b-766b
.dword 766b
.dword \sym
.popsection
#endif

2
arch/loongarch/include/asm/setup.h
View File

@ -25,7 +25,7 @@ extern void set_merr_handler(unsigned long offset, void *addr, unsigned long len
#ifdef CONFIG_RELOCATABLE
struct rela_la_abs {
long offset;
long pc;
long symvalue;
};

2
arch/loongarch/kernel/relocate.c
View File

@ -52,7 +52,7 @@ static inline void __init relocate_absolute(long random_offset)
for (p = begin; (void *)p < end; p++) {
long v = p->symvalue;
uint32_t lu12iw, ori, lu32id, lu52id;
union loongarch_instruction *insn = (void *)p - p->offset;
union loongarch_instruction *insn = (void *)p->pc;
lu12iw = (v >> 12) & 0xfffff;
ori = v & 0xfff;