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riscv: introduce assembly version of jump table

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This is the introductary patch for us to call the user copy that
supports fast unaligned access after the runtime detection.

Signed-off-by: Andy Chiu <tchiu@tenstorrent.com>
Link: https://patch.msgid.link/20260911182402.1434257-2-tchiu@tenstorrent.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>
This commit is contained in:
Andy Chiu 2026-10-05 19:02:54 -06:00 committed by Paul Walmsley
parent aa89052e09
commit 396d73f7b3
1 changed files with 26 additions and 0 deletions
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26
arch/riscv/include/asm/jump_label.h
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@ -65,6 +65,32 @@ static __always_inline bool arch_static_branch_jump(struct static_key * const ke
label:
return true;
}
#else
#include <asm/asm.h>
#define JUMP_TABLE_ENTRY(key, label) \
.pushsection __jump_table, "aw"; \
.align RISCV_LGPTR; \
.long 1b - ., label - .; \
RISCV_PTR key - .; \
.popsection
#define ARCH_STATIC_BRANCH_ASM(key, label) \
.align 2; \
.option push; \
.option norelax; \
.option norvc; \
1: nop; \
.option pop; \
JUMP_TABLE_ENTRY(key, label)
#define ARCH_STATIC_BRANCH_JUMP_ASM(key, label) \
.align 2; \
.option push; \
.option norelax; \
.option norvc; \
1: j label; \
.option pop; \
JUMP_TABLE_ENTRY(key, label)
#endif /* __ASSEMBLER__ */
#endif /* __ASM_JUMP_LABEL_H */