1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (c) 2010 Cavium Networks, Inc. 7 */ 8 #ifndef _ASM_MIPS_JUMP_LABEL_H 9 #define _ASM_MIPS_JUMP_LABEL_H 10 11 #ifndef __ASSEMBLY__ 12 13 #include <linux/types.h> 14 15 #define JUMP_LABEL_NOP_SIZE 4 16 17 #ifdef CONFIG_64BIT 18 #define WORD_INSN ".dword" 19 #else 20 #define WORD_INSN ".word" 21 #endif 22 23 #ifdef CONFIG_CPU_MICROMIPS 24 #define NOP_INSN "nop32" 25 #else 26 #define NOP_INSN "nop" 27 #endif 28 29 static __always_inline bool arch_static_branch(struct static_key *key, bool branch) 30 { 31 asm_volatile_goto("1:\t" NOP_INSN "\n\t" 32 "nop\n\t" 33 ".pushsection __jump_table, \"aw\"\n\t" 34 WORD_INSN " 1b, %l[l_yes], %0\n\t" 35 ".popsection\n\t" 36 : : "i" (&((char *)key)[branch]) : : l_yes); 37 38 return false; 39 l_yes: 40 return true; 41 } 42 43 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) 44 { 45 asm_volatile_goto("1:\tj %l[l_yes]\n\t" 46 "nop\n\t" 47 ".pushsection __jump_table, \"aw\"\n\t" 48 WORD_INSN " 1b, %l[l_yes], %0\n\t" 49 ".popsection\n\t" 50 : : "i" (&((char *)key)[branch]) : : l_yes); 51 52 return false; 53 l_yes: 54 return true; 55 } 56 57 #ifdef CONFIG_64BIT 58 typedef u64 jump_label_t; 59 #else 60 typedef u32 jump_label_t; 61 #endif 62 63 struct jump_entry { 64 jump_label_t code; 65 jump_label_t target; 66 jump_label_t key; 67 }; 68 69 #endif /* __ASSEMBLY__ */ 70 #endif /* _ASM_MIPS_JUMP_LABEL_H */ 71