LXR linux/arch/mips/include/asm/jump

   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
  35static __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;
  45l_yes:
  46        return true;
  47}
  48
  49static __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;
  58l_yes:
  59        return true;
  60}
  61
  62#ifdef CONFIG_64BIT
  63typedef u64 jump_label_t;
  64#else
  65typedef u32 jump_label_t;
  66#endif
  67
  68struct 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