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| author | Huacai Chen <chenhuacai@loongson.cn> | 2022-12-10 15:39:59 +0100 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-12-14 01:36:11 +0100 |
| commit | 19e5eb15b00c5841b4b9bd9777af2865a40d2f39 (patch) | |
| tree | f471107baccd8668f7cd72a2e8f5b5f690e30506 /arch/loongarch/kernel/vmlinux.lds.S | |
| parent | LoongArch: Add unaligned access support (diff) | |
| download | linux-19e5eb15b00c5841b4b9bd9777af2865a40d2f39.tar.xz linux-19e5eb15b00c5841b4b9bd9777af2865a40d2f39.zip | |
LoongArch: Add alternative runtime patching mechanism
Introduce the "alternative" mechanism from ARM64 and x86 for LoongArch
to apply runtime patching. The main purpose of this patch is to provide
a framework. In future we can use this mechanism (i.e., the ALTERNATIVE
and ALTERNATIVE_2 macros) to optimize hotspot functions according to cpu
features.
Signed-off-by: Jun Yi <yijun@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/kernel/vmlinux.lds.S')
| -rw-r--r-- | arch/loongarch/kernel/vmlinux.lds.S | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/vmlinux.lds.S b/arch/loongarch/kernel/vmlinux.lds.S index efecda0c2361..733b16e8d55d 100644 --- a/arch/loongarch/kernel/vmlinux.lds.S +++ b/arch/loongarch/kernel/vmlinux.lds.S @@ -54,6 +54,18 @@ SECTIONS . = ALIGN(PECOFF_SEGMENT_ALIGN); _etext = .; + /* + * struct alt_inst entries. From the header (alternative.h): + * "Alternative instructions for different CPU types or capabilities" + * Think locking instructions on spinlocks. + */ + . = ALIGN(4); + .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) { + __alt_instructions = .; + *(.altinstructions) + __alt_instructions_end = .; + } + .got : ALIGN(16) { *(.got) } .plt : ALIGN(16) { *(.plt) } .got.plt : ALIGN(16) { *(.got.plt) } |