arch/arm64/include/asm/insn.h

   1 /*
   2  * Copyright (C) 2013 Huawei Ltd.
   3  * Author: Jiang Liu <liuj97@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 #ifndef __ASM_INSN_H
  18 #define __ASM_INSN_H
  19
  20 #include <linux/types.h>
  21
  22 /* A64 instructions are always 32 bits. */
  23 #define AARCH64_INSN_SIZE               4
  24
  25 #ifndef __ASSEMBLY__
  26
  27 /*
  28  * ARM Architecture Reference Manual for ARMv8 Profile-A, Issue A.a
  29  * Section C3.1 "A64 instruction index by encoding":
  30  * AArch64 main encoding table
  31  *  Bit position
  32  *   28 27 26 25        Encoding Group
  33  *   0  0  -  -         Unallocated
  34  *   1  0  0  -         Data processing, immediate
  35  *   1  0  1  -         Branch, exception generation and system instructions
  36  *   -  1  -  0         Loads and stores
  37  *   -  1  0  1         Data processing - register
  38  *   0  1  1  1         Data processing - SIMD and floating point
  39  *   1  1  1  1         Data processing - SIMD and floating point
  40  * "-" means "don't care"
  41  */
  42 enum aarch64_insn_encoding_class {
  43         AARCH64_INSN_CLS_UNKNOWN,       /* UNALLOCATED */
  44         AARCH64_INSN_CLS_DP_IMM,        /* Data processing - immediate */
  45         AARCH64_INSN_CLS_DP_REG,        /* Data processing - register */
  46         AARCH64_INSN_CLS_DP_FPSIMD,     /* Data processing - SIMD and FP */
  47         AARCH64_INSN_CLS_LDST,          /* Loads and stores */
  48         AARCH64_INSN_CLS_BR_SYS,        /* Branch, exception generation and
  49                                          * system instructions */
  50 };
  51
  52 enum aarch64_insn_hint_op {
  53         AARCH64_INSN_HINT_NOP   = 0x0 << 5,
  54         AARCH64_INSN_HINT_YIELD = 0x1 << 5,
  55         AARCH64_INSN_HINT_WFE   = 0x2 << 5,
  56         AARCH64_INSN_HINT_WFI   = 0x3 << 5,
  57         AARCH64_INSN_HINT_SEV   = 0x4 << 5,
  58         AARCH64_INSN_HINT_SEVL  = 0x5 << 5,
  59 };
  60
  61 enum aarch64_insn_imm_type {
  62         AARCH64_INSN_IMM_ADR,
  63         AARCH64_INSN_IMM_26,
  64         AARCH64_INSN_IMM_19,
  65         AARCH64_INSN_IMM_16,
  66         AARCH64_INSN_IMM_14,
  67         AARCH64_INSN_IMM_12,
  68         AARCH64_INSN_IMM_9,
  69         AARCH64_INSN_IMM_MAX
  70 };
  71
  72 enum aarch64_insn_branch_type {
  73         AARCH64_INSN_BRANCH_NOLINK,
  74         AARCH64_INSN_BRANCH_LINK,
  75 };
  76
  77 #define __AARCH64_INSN_FUNCS(abbr, mask, val)   \
  78 static __always_inline bool aarch64_insn_is_##abbr(u32 code) \
  79 { return (code & (mask)) == (val); } \
  80 static __always_inline u32 aarch64_insn_get_##abbr##_value(void) \
  81 { return (val); }
  82
  83 __AARCH64_INSN_FUNCS(b,         0xFC000000, 0x14000000)
  84 __AARCH64_INSN_FUNCS(bl,        0xFC000000, 0x94000000)
  85 __AARCH64_INSN_FUNCS(svc,       0xFFE0001F, 0xD4000001)
  86 __AARCH64_INSN_FUNCS(hvc,       0xFFE0001F, 0xD4000002)
  87 __AARCH64_INSN_FUNCS(smc,       0xFFE0001F, 0xD4000003)
  88 __AARCH64_INSN_FUNCS(brk,       0xFFE0001F, 0xD4200000)
  89 __AARCH64_INSN_FUNCS(hint,      0xFFFFF01F, 0xD503201F)
  90
  91 #undef  __AARCH64_INSN_FUNCS
  92
  93 bool aarch64_insn_is_nop(u32 insn);
  94
  95 int aarch64_insn_read(void *addr, u32 *insnp);
  96 int aarch64_insn_write(void *addr, u32 insn);
  97 enum aarch64_insn_encoding_class aarch64_get_insn_class(u32 insn);
  98 u32 aarch64_insn_encode_immediate(enum aarch64_insn_imm_type type,
  99                                   u32 insn, u64 imm);
 100 u32 aarch64_insn_gen_branch_imm(unsigned long pc, unsigned long addr,
 101                                 enum aarch64_insn_branch_type type);
 102 u32 aarch64_insn_gen_hint(enum aarch64_insn_hint_op op);
 103 u32 aarch64_insn_gen_nop(void);
 104
 105 bool aarch64_insn_hotpatch_safe(u32 old_insn, u32 new_insn);
 106
 107 int aarch64_insn_patch_text_nosync(void *addr, u32 insn);
 108 int aarch64_insn_patch_text_sync(void *addrs[], u32 insns[], int cnt);
 109 int aarch64_insn_patch_text(void *addrs[], u32 insns[], int cnt);
 110
 111 #endif  /* __ASSEMBLY__ */
 112
 113 #endif  /* __ASM_INSN_H */