1 #ifndef _ASM_POWERPC_JUMP_LABEL_H 2 #define _ASM_POWERPC_JUMP_LABEL_H 3 4 /* 5 * Copyright 2010 Michael Ellerman, IBM Corp. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #ifndef __ASSEMBLY__ 14 #include <linux/types.h> 15 16 #include <asm/feature-fixups.h> 17 #include <asm/asm-compat.h> 18 19 #define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) 20 #define JUMP_LABEL_NOP_SIZE 4 21 22 static __always_inline bool arch_static_branch(struct static_key *key, bool branch) 23 { 24 asm_volatile_goto("1:\n\t" 25 "nop # arch_static_branch\n\t" 26 ".pushsection __jump_table, \"aw\"\n\t" 27 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" 28 ".popsection \n\t" 29 : : "i" (&((char *)key)[branch]) : : l_yes); 30 31 return false; 32 l_yes: 33 return true; 34 } 35 36 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) 37 { 38 asm_volatile_goto("1:\n\t" 39 "b %l[l_yes] # arch_static_branch_jump\n\t" 40 ".pushsection __jump_table, \"aw\"\n\t" 41 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" 42 ".popsection \n\t" 43 : : "i" (&((char *)key)[branch]) : : l_yes); 44 45 return false; 46 l_yes: 47 return true; 48 } 49 50 #ifdef CONFIG_PPC64 51 typedef u64 jump_label_t; 52 #else 53 typedef u32 jump_label_t; 54 #endif 55 56 struct jump_entry { 57 jump_label_t code; 58 jump_label_t target; 59 jump_label_t key; 60 }; 61 62 #else 63 #define ARCH_STATIC_BRANCH(LABEL, KEY) \ 64 1098: nop; \ 65 .pushsection __jump_table, "aw"; \ 66 FTR_ENTRY_LONG 1098b, LABEL, KEY; \ 67 .popsection 68 #endif 69 70 #endif /* _ASM_POWERPC_JUMP_LABEL_H */ 71