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 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" 24 ".popsection \n\t" 25 : : "i" (&((char *)key)[branch]) : : l_yes); 26 27 return false; 28 l_yes: 29 return true; 30 } 31 32 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) 33 { 34 asm_volatile_goto("1:\n\t" 35 "b %l[l_yes] # arch_static_branch_jump\n\t" 36 ".pushsection __jump_table, \"aw\"\n\t" 37 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" 38 ".popsection \n\t" 39 : : "i" (&((char *)key)[branch]) : : l_yes); 40 41 return false; 42 l_yes: 43 return true; 44 } 45 46 #ifdef CONFIG_PPC64 47 typedef u64 jump_label_t; 48 #else 49 typedef u32 jump_label_t; 50 #endif 51 52 struct jump_entry { 53 jump_label_t code; 54 jump_label_t target; 55 jump_label_t key; 56 }; 57 58 #else 59 #define ARCH_STATIC_BRANCH(LABEL, KEY) \ 60 1098: nop; \ 61 .pushsection __jump_table, "aw"; \ 62 FTR_ENTRY_LONG 1098b, LABEL, KEY; \ 63 .popsection 64 #endif 65 66 #endif /* _ASM_POWERPC_JUMP_LABEL_H */ 67