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