diff options
Diffstat (limited to 'arch/riscv/include/asm/jump_label.h')
| -rw-r--r-- | arch/riscv/include/asm/jump_label.h | 66 |
1 files changed, 38 insertions, 28 deletions
diff --git a/arch/riscv/include/asm/jump_label.h b/arch/riscv/include/asm/jump_label.h index 38af2ec7b9bf..3ab5f2e3212b 100644 --- a/arch/riscv/include/asm/jump_label.h +++ b/arch/riscv/include/asm/jump_label.h @@ -7,27 +7,37 @@ #ifndef __ASM_JUMP_LABEL_H #define __ASM_JUMP_LABEL_H -#ifndef __ASSEMBLY__ +#ifndef __ASSEMBLER__ #include <linux/types.h> #include <asm/asm.h> +#define HAVE_JUMP_LABEL_BATCH + #define JUMP_LABEL_NOP_SIZE 4 -static __always_inline bool arch_static_branch(struct static_key *key, - bool branch) +#define JUMP_TABLE_ENTRY(key, label) \ + ".pushsection __jump_table, \"aw\" \n\t" \ + ".align " RISCV_LGPTR " \n\t" \ + ".long 1b - ., " label " - . \n\t" \ + "" RISCV_PTR " " key " - . \n\t" \ + ".popsection \n\t" + +/* This macro is also expanded on the Rust side. */ +#define ARCH_STATIC_BRANCH_ASM(key, label) \ + " .align 2 \n\t" \ + " .option push \n\t" \ + " .option norelax \n\t" \ + " .option norvc \n\t" \ + "1: nop \n\t" \ + " .option pop \n\t" \ + JUMP_TABLE_ENTRY(key, label) + +static __always_inline bool arch_static_branch(struct static_key * const key, + const bool branch) { - asm_volatile_goto( - " .option push \n\t" - " .option norelax \n\t" - " .option norvc \n\t" - "1: nop \n\t" - " .option pop \n\t" - " .pushsection __jump_table, \"aw\" \n\t" - " .align " RISCV_LGPTR " \n\t" - " .long 1b - ., %l[label] - . \n\t" - " " RISCV_PTR " %0 - . \n\t" - " .popsection \n\t" + asm goto( + ARCH_STATIC_BRANCH_ASM("%0", "%l[label]") : : "i"(&((char *)key)[branch]) : : label); return false; @@ -35,20 +45,20 @@ label: return true; } -static __always_inline bool arch_static_branch_jump(struct static_key *key, - bool branch) +#define ARCH_STATIC_BRANCH_JUMP_ASM(key, label) \ + " .align 2 \n\t" \ + " .option push \n\t" \ + " .option norelax \n\t" \ + " .option norvc \n\t" \ + "1: j " label " \n\t" \ + " .option pop \n\t" \ + JUMP_TABLE_ENTRY(key, label) + +static __always_inline bool arch_static_branch_jump(struct static_key * const key, + const bool branch) { - asm_volatile_goto( - " .option push \n\t" - " .option norelax \n\t" - " .option norvc \n\t" - "1: jal zero, %l[label] \n\t" - " .option pop \n\t" - " .pushsection __jump_table, \"aw\" \n\t" - " .align " RISCV_LGPTR " \n\t" - " .long 1b - ., %l[label] - . \n\t" - " " RISCV_PTR " %0 - . \n\t" - " .popsection \n\t" + asm goto( + ARCH_STATIC_BRANCH_JUMP_ASM("%0", "%l[label]") : : "i"(&((char *)key)[branch]) : : label); return false; @@ -56,5 +66,5 @@ label: return true; } -#endif /* __ASSEMBLY__ */ +#endif /* __ASSEMBLER__ */ #endif /* __ASM_JUMP_LABEL_H */ |