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 #define arch_jump_label_transform_static arch_jump_label_transform 12 13 #ifndef __ASSEMBLY__ 14 15 #include <linux/types.h> 16 #include <asm/isa-rev.h> 17 18 struct module; 19 extern void jump_label_apply_nops(struct module *mod); 20 21 #define JUMP_LABEL_NOP_SIZE 4 22 23 #ifdef CONFIG_64BIT 24 #define WORD_INSN ".dword" 25 #else 26 #define WORD_INSN ".word" 27 #endif 28 29 #ifdef CONFIG_CPU_MICROMIPS 30 # define B_INSN "b32" 31 # define J_INSN "j32" 32 #elif MIPS_ISA_REV >= 6 33 # define B_INSN "bc" 34 # define J_INSN "bc" 35 #else 36 # define B_INSN "b" 37 # define J_INSN "j" 38 #endif 39 40 static __always_inline bool arch_static_branch(struct static_key *key, bool branch) 41 { 42 asm goto("1:\t" B_INSN " 2f\n\t" 43 "2:\t.insn\n\t" 44 ".pushsection __jump_table, \"aw\"\n\t" 45 WORD_INSN " 1b, %l[l_yes], %0\n\t" 46 ".popsection\n\t" 47 : : "i" (&((char *)key)[branch]) : : l_yes); 48 49 return false; 50 l_yes: 51 return true; 52 } 53 54 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) 55 { 56 asm goto("1:\t" J_INSN " %l[l_yes]\n\t" 57 ".pushsection __jump_table, \"aw\"\n\t" 58 WORD_INSN " 1b, %l[l_yes], %0\n\t" 59 ".popsection\n\t" 60 : : "i" (&((char *)key)[branch]) : : l_yes); 61 62 return false; 63 l_yes: 64 return true; 65 } 66 67 #ifdef CONFIG_64BIT 68 typedef u64 jump_label_t; 69 #else 70 typedef u32 jump_label_t; 71 #endif 72 73 struct jump_entry { 74 jump_label_t code; 75 jump_label_t target; 76 jump_label_t key; 77 }; 78 79 #endif /* __ASSEMBLY__ */ 80 #endif /* _ASM_MIPS_JUMP_LABEL_H */ 81