diff options
Diffstat (limited to 'kernel/arch/arm64/include/asm/alternative-asm.h')
| -rw-r--r-- | kernel/arch/arm64/include/asm/alternative-asm.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/kernel/arch/arm64/include/asm/alternative-asm.h b/kernel/arch/arm64/include/asm/alternative-asm.h new file mode 100644 index 000000000..919a67855 --- /dev/null +++ b/kernel/arch/arm64/include/asm/alternative-asm.h @@ -0,0 +1,29 @@ +#ifndef __ASM_ALTERNATIVE_ASM_H +#define __ASM_ALTERNATIVE_ASM_H + +#ifdef __ASSEMBLY__ + +.macro altinstruction_entry orig_offset alt_offset feature orig_len alt_len + .word \orig_offset - . + .word \alt_offset - . + .hword \feature + .byte \orig_len + .byte \alt_len +.endm + +.macro alternative_insn insn1 insn2 cap +661: \insn1 +662: .pushsection .altinstructions, "a" + altinstruction_entry 661b, 663f, \cap, 662b-661b, 664f-663f + .popsection + .pushsection .altinstr_replacement, "ax" +663: \insn2 +664: .popsection + .if ((664b-663b) != (662b-661b)) + .error "Alternatives instruction length mismatch" + .endif +.endm + +#endif /* __ASSEMBLY__ */ + +#endif /* __ASM_ALTERNATIVE_ASM_H */ |