1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef _ASM_POWERPC_JUMP_LABEL_H 3 #define _ASM_POWERPC_JUMP_LABEL_H 4 5 /* 6 * Copyright 2010 Michael Ellerman, IBM Corp. 7 */ 8 9 #ifndef __ASSEMBLER__ 10 #include <linux/types.h> 11 12 #include <asm/feature-fixups.h> 13 #include <asm/asm-const.h> 14 15 #define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) 16 #define JUMP_LABEL_NOP_SIZE 4 17 18 #define JUMP_TABLE_ENTRY(key, label) \ 19 ".pushsection __jump_table, \"aw\" \n\t" \ 20 ".long 1b - ., " label " - . \n\t" \ 21 JUMP_ENTRY_TYPE key " - . \n\t" \ 22 ".popsection \n\t" 23 24 #define ARCH_STATIC_BRANCH_ASM(key, label) \ 25 "1: nop \n\t" \ 26 JUMP_TABLE_ENTRY(key, label) 27 28 static __always_inline bool arch_static_branch(struct static_key *key, bool branch) 29 { 30 asm goto( 31 ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]") 32 : : "i" (&((char *)key)[branch]) : : l_yes); 33 34 return false; 35 l_yes: 36 return true; 37 } 38 39 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) 40 { 41 asm goto("1:\n\t" 42 "b %l[l_yes] # arch_static_branch_jump\n\t" 43 JUMP_TABLE_ENTRY("%c0", "%l[l_yes]") 44 : : "i" (&((char *)key)[branch]) : : l_yes); 45 46 return false; 47 l_yes: 48 return true; 49 } 50 51 #else 52 #define ARCH_STATIC_BRANCH(LABEL, KEY) \ 53 1098: nop; \ 54 .pushsection __jump_table, "aw"; \ 55 .long 1098b - ., LABEL - .; \ 56 FTR_ENTRY_LONG KEY - .; \ 57 .popsection 58 #endif 59 60 #endif /* _ASM_POWERPC_JUMP_LABEL_H */ 61