tcg/tci/tcg-target.h

   1 /*
   2  * Tiny Code Generator for QEMU
   3  *
   4  * Copyright (c) 2009, 2011 Stefan Weil
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 /*
  26  * This code implements a TCG which does not generate machine code for some
  27  * real target machine but which generates virtual machine code for an
  28  * interpreter. Interpreted pseudo code is slow, but it works on any host.
  29  *
  30  * Some remarks might help in understanding the code:
  31  *
  32  * "target" or "TCG target" is the machine which runs the generated code.
  33  * This is different to the usual meaning in QEMU where "target" is the
  34  * emulated machine. So normally QEMU host is identical to TCG target.
  35  * Here the TCG target is a virtual machine, but this virtual machine must
  36  * use the same word size like the real machine.
  37  * Therefore, we need both 32 and 64 bit virtual machines (interpreter).
  38  */
  39
  40 #ifndef TCG_TARGET_H
  41 #define TCG_TARGET_H
  42
  43 #define TCG_TARGET_INTERPRETER 1
  44 #define TCG_TARGET_INSN_UNIT_SIZE 1
  45 #define TCG_TARGET_TLB_DISPLACEMENT_BITS 32
  46
  47 #if UINTPTR_MAX == UINT32_MAX
  48 # define TCG_TARGET_REG_BITS 32
  49 #elif UINTPTR_MAX == UINT64_MAX
  50 # define TCG_TARGET_REG_BITS 64
  51 #else
  52 # error Unknown pointer size for tci target
  53 #endif
  54
  55 #ifdef CONFIG_DEBUG_TCG
  56 /* Enable debug output. */
  57 #define CONFIG_DEBUG_TCG_INTERPRETER
  58 #endif
  59
  60 /* Optional instructions. */
  61
  62 #define TCG_TARGET_HAS_bswap16_i32      1
  63 #define TCG_TARGET_HAS_bswap32_i32      1
  64 #define TCG_TARGET_HAS_div_i32          1
  65 #define TCG_TARGET_HAS_rem_i32          1
  66 #define TCG_TARGET_HAS_ext8s_i32        1
  67 #define TCG_TARGET_HAS_ext16s_i32       1
  68 #define TCG_TARGET_HAS_ext8u_i32        1
  69 #define TCG_TARGET_HAS_ext16u_i32       1
  70 #define TCG_TARGET_HAS_andc_i32         0
  71 #define TCG_TARGET_HAS_deposit_i32      1
  72 #define TCG_TARGET_HAS_extract_i32      0
  73 #define TCG_TARGET_HAS_sextract_i32     0
  74 #define TCG_TARGET_HAS_extract2_i32     0
  75 #define TCG_TARGET_HAS_eqv_i32          0
  76 #define TCG_TARGET_HAS_nand_i32         0
  77 #define TCG_TARGET_HAS_nor_i32          0
  78 #define TCG_TARGET_HAS_clz_i32          0
  79 #define TCG_TARGET_HAS_ctz_i32          0
  80 #define TCG_TARGET_HAS_ctpop_i32        0
  81 #define TCG_TARGET_HAS_neg_i32          1
  82 #define TCG_TARGET_HAS_not_i32          1
  83 #define TCG_TARGET_HAS_orc_i32          0
  84 #define TCG_TARGET_HAS_rot_i32          1
  85 #define TCG_TARGET_HAS_movcond_i32      0
  86 #define TCG_TARGET_HAS_muls2_i32        0
  87 #define TCG_TARGET_HAS_muluh_i32        0
  88 #define TCG_TARGET_HAS_mulsh_i32        0
  89 #define TCG_TARGET_HAS_goto_ptr         0
  90 #define TCG_TARGET_HAS_direct_jump      1
  91 #define TCG_TARGET_HAS_qemu_st8_i32     0
  92
  93 #if TCG_TARGET_REG_BITS == 64
  94 #define TCG_TARGET_HAS_extrl_i64_i32    0
  95 #define TCG_TARGET_HAS_extrh_i64_i32    0
  96 #define TCG_TARGET_HAS_bswap16_i64      1
  97 #define TCG_TARGET_HAS_bswap32_i64      1
  98 #define TCG_TARGET_HAS_bswap64_i64      1
  99 #define TCG_TARGET_HAS_deposit_i64      1
 100 #define TCG_TARGET_HAS_extract_i64      0
 101 #define TCG_TARGET_HAS_sextract_i64     0
 102 #define TCG_TARGET_HAS_extract2_i64     0
 103 #define TCG_TARGET_HAS_div_i64          0
 104 #define TCG_TARGET_HAS_rem_i64          0
 105 #define TCG_TARGET_HAS_ext8s_i64        1
 106 #define TCG_TARGET_HAS_ext16s_i64       1
 107 #define TCG_TARGET_HAS_ext32s_i64       1
 108 #define TCG_TARGET_HAS_ext8u_i64        1
 109 #define TCG_TARGET_HAS_ext16u_i64       1
 110 #define TCG_TARGET_HAS_ext32u_i64       1
 111 #define TCG_TARGET_HAS_andc_i64         0
 112 #define TCG_TARGET_HAS_eqv_i64          0
 113 #define TCG_TARGET_HAS_nand_i64         0
 114 #define TCG_TARGET_HAS_nor_i64          0
 115 #define TCG_TARGET_HAS_clz_i64          0
 116 #define TCG_TARGET_HAS_ctz_i64          0
 117 #define TCG_TARGET_HAS_ctpop_i64        0
 118 #define TCG_TARGET_HAS_neg_i64          1
 119 #define TCG_TARGET_HAS_not_i64          1
 120 #define TCG_TARGET_HAS_orc_i64          0
 121 #define TCG_TARGET_HAS_rot_i64          1
 122 #define TCG_TARGET_HAS_movcond_i64      0
 123 #define TCG_TARGET_HAS_muls2_i64        0
 124 #define TCG_TARGET_HAS_add2_i32         0
 125 #define TCG_TARGET_HAS_sub2_i32         0
 126 #define TCG_TARGET_HAS_mulu2_i32        0
 127 #define TCG_TARGET_HAS_add2_i64         0
 128 #define TCG_TARGET_HAS_sub2_i64         0
 129 #define TCG_TARGET_HAS_mulu2_i64        0
 130 #define TCG_TARGET_HAS_muluh_i64        0
 131 #define TCG_TARGET_HAS_mulsh_i64        0
 132 #else
 133 #define TCG_TARGET_HAS_mulu2_i32        1
 134 #endif /* TCG_TARGET_REG_BITS == 64 */
 135
 136 /* Number of registers available.
 137    For 32 bit hosts, we need more than 8 registers (call arguments). */
 138 /* #define TCG_TARGET_NB_REGS 8 */
 139 #define TCG_TARGET_NB_REGS 16
 140 /* #define TCG_TARGET_NB_REGS 32 */
 141
 142 /* List of registers which are used by TCG. */
 143 typedef enum {
 144     TCG_REG_R0 = 0,
 145     TCG_REG_R1,
 146     TCG_REG_R2,
 147     TCG_REG_R3,
 148     TCG_REG_R4,
 149     TCG_REG_R5,
 150     TCG_REG_R6,
 151     TCG_REG_R7,
 152 #if TCG_TARGET_NB_REGS >= 16
 153     TCG_REG_R8,
 154     TCG_REG_R9,
 155     TCG_REG_R10,
 156     TCG_REG_R11,
 157     TCG_REG_R12,
 158     TCG_REG_R13,
 159     TCG_REG_R14,
 160     TCG_REG_R15,
 161 #if TCG_TARGET_NB_REGS >= 32
 162     TCG_REG_R16,
 163     TCG_REG_R17,
 164     TCG_REG_R18,
 165     TCG_REG_R19,
 166     TCG_REG_R20,
 167     TCG_REG_R21,
 168     TCG_REG_R22,
 169     TCG_REG_R23,
 170     TCG_REG_R24,
 171     TCG_REG_R25,
 172     TCG_REG_R26,
 173     TCG_REG_R27,
 174     TCG_REG_R28,
 175     TCG_REG_R29,
 176     TCG_REG_R30,
 177     TCG_REG_R31,
 178 #endif
 179 #endif
 180     /* Special value UINT8_MAX is used by TCI to encode constant values. */
 181     TCG_CONST = UINT8_MAX
 182 } TCGReg;
 183
 184 #define TCG_AREG0                       (TCG_TARGET_NB_REGS - 2)
 185
 186 /* Used for function call generation. */
 187 #define TCG_REG_CALL_STACK              (TCG_TARGET_NB_REGS - 1)
 188 #define TCG_TARGET_CALL_STACK_OFFSET    0
 189 #define TCG_TARGET_STACK_ALIGN          16
 190
 191 void tci_disas(uint8_t opc);
 192
 193 #define HAVE_TCG_QEMU_TB_EXEC
 194
 195 /* We could notice __i386__ or __s390x__ and reduce the barriers depending
 196    on the host.  But if you want performance, you use the normal backend.
 197    We prefer consistency across hosts on this.  */
 198 #define TCG_TARGET_DEFAULT_MO  (0)
 199
 200 #define TCG_TARGET_HAS_MEMORY_BSWAP     1
 201
 202 static inline void tb_target_set_jmp_target(uintptr_t tc_ptr, uintptr_t jmp_rx,
 203                                             uintptr_t jmp_rw, uintptr_t addr)
 204 {
 205     /* patch the branch destination */
 206     qatomic_set((int32_t *)jmp_rw, addr - (jmp_rx + 4));
 207     /* no need to flush icache explicitly */
 208 }
 209
 210 #endif /* TCG_TARGET_H */