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