1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_ARM_JUMP_LABEL_H 3 #define _ASM_ARM_JUMP_LABEL_H 4 5 #ifndef __ASSEMBLY__ 6 7 #include <linux/types.h> 8 #include <asm/unified.h> 9 10 #define JUMP_LABEL_NOP_SIZE 4 11 12 /* This macro is also expanded on the Rust side. */ 13 #define ARCH_STATIC_BRANCH_ASM(key, label) \ 14 "1:\n\t" \ 15 WASM(nop) "\n\t" \ 16 ".pushsection __jump_table, \"aw\"\n\t" \ 17 ".word 1b, " label ", " key "\n\t" \ 18 ".popsection\n\t" \ 19 20 static __always_inline bool arch_static_branch(struct static_key *key, bool branch) 21 { 22 asm goto(ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]") 23 : : "i" (&((char *)key)[branch]) : : l_yes); 24 25 return false; 26 l_yes: 27 return true; 28 } 29 30 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) 31 { 32 asm goto("1:\n\t" 33 WASM(b) " %l[l_yes]\n\t" 34 ".pushsection __jump_table, \"aw\"\n\t" 35 ".word 1b, %l[l_yes], %c0\n\t" 36 ".popsection\n\t" 37 : : "i" (&((char *)key)[branch]) : : l_yes); 38 39 return false; 40 l_yes: 41 return true; 42 } 43 44 typedef u32 jump_label_t; 45 46 struct jump_entry { 47 jump_label_t code; 48 jump_label_t target; 49 jump_label_t key; 50 }; 51 52 #endif /* __ASSEMBLY__ */ 53 #endif 54