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 __ASSEMBLY__ 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 static __always_inline bool arch_static_branch(struct static_key *key, bool branch) 19 { 20 asm_volatile_goto("1:\n\t" 21 "nop # arch_static_branch\n\t" 22 ".pushsection __jump_table, \"aw\"\n\t" 23 ".long 1b - ., %l[l_yes] - .\n\t" 24 JUMP_ENTRY_TYPE "%c0 - .\n\t" 25 ".popsection \n\t" 26 : : "i" (&((char *)key)[branch]) : : l_yes); 27 28 return false; 29 l_yes: 30 return true; 31 } 32 33 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) 34 { 35 asm_volatile_goto("1:\n\t" 36 "b %l[l_yes] # arch_static_branch_jump\n\t" 37 ".pushsection __jump_table, \"aw\"\n\t" 38 ".long 1b - ., %l[l_yes] - .\n\t" 39 JUMP_ENTRY_TYPE "%c0 - .\n\t" 40 ".popsection \n\t" 41 : : "i" (&((char *)key)[branch]) : : l_yes); 42 43 return false; 44 l_yes: 45 return true; 46 } 47 48 #else 49 #define ARCH_STATIC_BRANCH(LABEL, KEY) \ 50 1098: nop; \ 51 .pushsection __jump_table, "aw"; \ 52 .long 1098b - ., LABEL - .; \ 53 FTR_ENTRY_LONG KEY - .; \ 54 .popsection 55 #endif 56 57 #endif /* _ASM_POWERPC_JUMP_LABEL_H */ 58