1 | /*
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2 | * Tiny Code Generator for QEMU
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3 | *
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4 | * Copyright (c) 2008 Fabrice Bellard
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5 | *
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6 | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | * of this software and associated documentation files (the "Software"), to deal
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8 | * in the Software without restriction, including without limitation the rights
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9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | * copies of the Software, and to permit persons to whom the Software is
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11 | * furnished to do so, subject to the following conditions:
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12 | *
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13 | * The above copyright notice and this permission notice shall be included in
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14 | * all copies or substantial portions of the Software.
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15 | *
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16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | * THE SOFTWARE.
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23 | */
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24 |
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25 | #include "tcg-target.h"
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26 |
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27 | #if TCG_TARGET_REG_BITS == 32
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28 | typedef int32_t tcg_target_long;
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29 | typedef uint32_t tcg_target_ulong;
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30 | #define TCG_PRIlx PRIx32
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31 | #define TCG_PRIld PRId32
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32 | #elif TCG_TARGET_REG_BITS == 64
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33 | typedef int64_t tcg_target_long;
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34 | typedef uint64_t tcg_target_ulong;
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35 | #define TCG_PRIlx PRIx64
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36 | #define TCG_PRIld PRId64
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37 | #else
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38 | #error unsupported
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39 | #endif
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40 |
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41 | #if TCG_TARGET_NB_REGS <= 32
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42 | typedef uint32_t TCGRegSet;
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43 | #elif TCG_TARGET_NB_REGS <= 64
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44 | typedef uint64_t TCGRegSet;
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45 | #else
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46 | #error unsupported
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47 | #endif
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48 |
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49 | enum {
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50 | #define DEF(s, n, copy_size) INDEX_op_ ## s,
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51 | #include "tcg-opc.h"
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52 | #undef DEF
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53 | NB_OPS,
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54 | };
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55 |
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56 | #define tcg_regset_clear(d) (d) = 0
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57 | #define tcg_regset_set(d, s) (d) = (s)
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58 | #define tcg_regset_set32(d, reg, val32) (d) |= (val32) << (reg)
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59 | #define tcg_regset_set_reg(d, r) (d) |= 1 << (r)
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60 | #define tcg_regset_reset_reg(d, r) (d) &= ~(1 << (r))
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61 | #define tcg_regset_test_reg(d, r) (((d) >> (r)) & 1)
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62 | #define tcg_regset_or(d, a, b) (d) = (a) | (b)
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63 | #define tcg_regset_and(d, a, b) (d) = (a) & (b)
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64 | #define tcg_regset_andnot(d, a, b) (d) = (a) & ~(b)
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65 | #define tcg_regset_not(d, a) (d) = ~(a)
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66 |
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67 | typedef struct TCGRelocation {
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68 | struct TCGRelocation *next;
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69 | int type;
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70 | uint8_t *ptr;
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71 | tcg_target_long addend;
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72 | } TCGRelocation;
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73 |
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74 | typedef struct TCGLabel {
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75 | int has_value;
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76 | union {
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77 | tcg_target_ulong value;
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78 | TCGRelocation *first_reloc;
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79 | } u;
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80 | } TCGLabel;
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81 |
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82 | typedef struct TCGPool {
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83 | struct TCGPool *next;
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84 | int size;
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85 | #ifndef VBOX
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86 | uint8_t data[0] __attribute__ ((aligned));
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87 | #else
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88 | ALIGNED_MEMBER_DEF(uint8_t, data[0]);
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89 | #endif
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90 | } TCGPool;
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91 |
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92 | #define TCG_POOL_CHUNK_SIZE 32768
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93 |
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94 | #define TCG_MAX_LABELS 512
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95 |
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96 | #define TCG_MAX_TEMPS 512
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97 |
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98 | /* when the size of the arguments of a called function is smaller than
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99 | this value, they are statically allocated in the TB stack frame */
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100 | #define TCG_STATIC_CALL_ARGS_SIZE 128
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101 |
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102 | typedef int TCGType;
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103 |
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104 | #define TCG_TYPE_I32 0
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105 | #define TCG_TYPE_I64 1
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106 | #define TCG_TYPE_COUNT 2 /* number of different types */
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107 |
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108 | #if TCG_TARGET_REG_BITS == 32
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109 | #define TCG_TYPE_PTR TCG_TYPE_I32
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110 | #else
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111 | #define TCG_TYPE_PTR TCG_TYPE_I64
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112 | #endif
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113 |
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114 | typedef tcg_target_ulong TCGArg;
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115 |
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116 | /* Define a type and accessor macros for varables. Using a struct is
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117 | nice because it gives some level of type safely. Ideally the compiler
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118 | be able to see through all this. However in practice this is not true,
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119 | expecially on targets with braindamaged ABIs (e.g. i386).
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120 | We use plain int by default to avoid this runtime overhead.
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121 | Users of tcg_gen_* don't need to know about any of this, and should
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122 | treat TCGv as an opaque type. */
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123 |
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124 | //#define DEBUG_TCGV 1
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125 |
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126 | #ifdef DEBUG_TCGV
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127 |
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128 | typedef struct
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129 | {
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130 | int n;
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131 | } TCGv;
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132 |
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133 | #define MAKE_TCGV(i) __extension__ \
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134 | ({ TCGv make_tcgv_tmp = {i}; make_tcgv_tmp;})
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135 | #define GET_TCGV(t) ((t).n)
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136 | #if TCG_TARGET_REG_BITS == 32
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137 | #define TCGV_HIGH(t) MAKE_TCGV(GET_TCGV(t) + 1)
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138 | #endif
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139 |
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140 | #else /* !DEBUG_TCGV */
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141 |
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142 | typedef int TCGv;
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143 | #define MAKE_TCGV(x) (x)
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144 | #define GET_TCGV(t) (t)
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145 | #if TCG_TARGET_REG_BITS == 32
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146 | #define TCGV_HIGH(t) ((t) + 1)
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147 | #endif
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148 |
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149 | #endif /* DEBUG_TCGV */
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150 |
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151 | /* Dummy definition to avoid compiler warnings. */
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152 | #define TCGV_UNUSED(x) x = MAKE_TCGV(-1)
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153 |
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154 | /* call flags */
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155 | #define TCG_CALL_TYPE_MASK 0x000f
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156 | #define TCG_CALL_TYPE_STD 0x0000 /* standard C call */
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157 | #define TCG_CALL_TYPE_REGPARM_1 0x0001 /* i386 style regparm call (1 reg) */
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158 | #define TCG_CALL_TYPE_REGPARM_2 0x0002 /* i386 style regparm call (2 regs) */
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159 | #define TCG_CALL_TYPE_REGPARM 0x0003 /* i386 style regparm call (3 regs) */
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160 | /* A pure function only reads its arguments and globals variables and
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161 | cannot raise exceptions. Hence a call to a pure function can be
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162 | safely suppressed if the return value is not used. */
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163 | #define TCG_CALL_PURE 0x0010
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164 |
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165 | /* used to align parameters */
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166 | #define TCG_CALL_DUMMY_TCGV MAKE_TCGV(-1)
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167 | #define TCG_CALL_DUMMY_ARG ((TCGArg)(-1))
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168 |
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169 | typedef enum {
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170 | TCG_COND_EQ,
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171 | TCG_COND_NE,
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172 | TCG_COND_LT,
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173 | TCG_COND_GE,
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174 | TCG_COND_LE,
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175 | TCG_COND_GT,
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176 | /* unsigned */
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177 | TCG_COND_LTU,
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178 | TCG_COND_GEU,
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179 | TCG_COND_LEU,
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180 | TCG_COND_GTU,
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181 | } TCGCond;
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182 |
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183 | #define TEMP_VAL_DEAD 0
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184 | #define TEMP_VAL_REG 1
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185 | #define TEMP_VAL_MEM 2
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186 | #define TEMP_VAL_CONST 3
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187 |
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188 | /* XXX: optimize memory layout */
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189 | typedef struct TCGTemp {
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190 | TCGType base_type;
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191 | TCGType type;
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192 | int val_type;
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193 | int reg;
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194 | tcg_target_long val;
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195 | int mem_reg;
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196 | tcg_target_long mem_offset;
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197 | unsigned int fixed_reg:1;
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198 | unsigned int mem_coherent:1;
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199 | unsigned int mem_allocated:1;
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200 | unsigned int temp_local:1; /* If true, the temp is saved accross
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201 | basic blocks. Otherwise, it is not
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202 | preserved accross basic blocks. */
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203 | unsigned int temp_allocated:1; /* never used for code gen */
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204 | /* index of next free temp of same base type, -1 if end */
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205 | int next_free_temp;
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206 | const char *name;
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207 | } TCGTemp;
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208 |
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209 | typedef struct TCGHelperInfo {
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210 | tcg_target_ulong func;
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211 | const char *name;
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212 | } TCGHelperInfo;
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213 |
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214 | typedef struct TCGContext TCGContext;
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215 |
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216 | struct TCGContext {
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217 | uint8_t *pool_cur, *pool_end;
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218 | TCGPool *pool_first, *pool_current;
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219 | TCGLabel *labels;
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220 | int nb_labels;
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221 | TCGTemp *temps; /* globals first, temps after */
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222 | int nb_globals;
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223 | int nb_temps;
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224 | /* index of free temps, -1 if none */
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225 | int first_free_temp[TCG_TYPE_COUNT * 2];
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226 |
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227 | /* goto_tb support */
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228 | uint8_t *code_buf;
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229 | unsigned long *tb_next;
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230 | uint16_t *tb_next_offset;
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231 | uint16_t *tb_jmp_offset; /* != NULL if USE_DIRECT_JUMP */
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232 |
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233 | /* liveness analysis */
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234 | uint16_t *op_dead_iargs; /* for each operation, each bit tells if the
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235 | corresponding input argument is dead */
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236 |
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237 | /* tells in which temporary a given register is. It does not take
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238 | into account fixed registers */
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239 | int reg_to_temp[TCG_TARGET_NB_REGS];
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240 | TCGRegSet reserved_regs;
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241 | tcg_target_long current_frame_offset;
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242 | tcg_target_long frame_start;
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243 | tcg_target_long frame_end;
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244 | int frame_reg;
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245 |
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246 | uint8_t *code_ptr;
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247 | TCGTemp static_temps[TCG_MAX_TEMPS];
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248 |
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249 | TCGHelperInfo *helpers;
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250 | int nb_helpers;
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251 | int allocated_helpers;
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252 | int helpers_sorted;
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253 |
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254 | #ifdef CONFIG_PROFILER
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255 | /* profiling info */
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256 | int64_t tb_count1;
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257 | int64_t tb_count;
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258 | int64_t op_count; /* total insn count */
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259 | int op_count_max; /* max insn per TB */
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260 | int64_t temp_count;
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261 | int temp_count_max;
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262 | int64_t old_op_count;
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263 | int64_t del_op_count;
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264 | int64_t code_in_len;
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265 | int64_t code_out_len;
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266 | int64_t interm_time;
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267 | int64_t code_time;
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268 | int64_t la_time;
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269 | int64_t restore_count;
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270 | int64_t restore_time;
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271 | #endif
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272 | };
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273 |
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274 | extern TCGContext tcg_ctx;
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275 | extern uint16_t *gen_opc_ptr;
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276 | extern TCGArg *gen_opparam_ptr;
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277 | extern uint16_t gen_opc_buf[];
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278 | extern TCGArg gen_opparam_buf[];
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279 |
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280 | /* pool based memory allocation */
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281 |
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282 | void *tcg_malloc_internal(TCGContext *s, int size);
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283 | void tcg_pool_reset(TCGContext *s);
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284 | void tcg_pool_delete(TCGContext *s);
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285 |
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286 | #ifndef VBOX
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287 | static inline void *tcg_malloc(int size)
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288 | #else
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289 | DECLINLINE(void *) tcg_malloc(int size)
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290 | #endif
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291 | {
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292 | TCGContext *s = &tcg_ctx;
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293 | uint8_t *ptr, *ptr_end;
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294 | size = (size + sizeof(long) - 1) & ~(sizeof(long) - 1);
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295 | ptr = s->pool_cur;
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296 | ptr_end = ptr + size;
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297 | if (unlikely(ptr_end > s->pool_end)) {
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298 | return tcg_malloc_internal(&tcg_ctx, size);
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299 | } else {
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300 | s->pool_cur = ptr_end;
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301 | return ptr;
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302 | }
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303 | }
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304 |
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305 | void tcg_context_init(TCGContext *s);
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306 | void tcg_func_start(TCGContext *s);
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307 |
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308 | int dyngen_code(TCGContext *s, uint8_t *gen_code_buf);
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309 | int dyngen_code_search_pc(TCGContext *s, uint8_t *gen_code_buf, long offset);
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310 |
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311 | void tcg_set_frame(TCGContext *s, int reg,
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312 | tcg_target_long start, tcg_target_long size);
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313 | TCGv tcg_global_reg_new(TCGType type, int reg, const char *name);
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314 | TCGv tcg_global_reg2_new_hack(TCGType type, int reg1, int reg2,
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315 | const char *name);
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316 | TCGv tcg_global_mem_new(TCGType type, int reg, tcg_target_long offset,
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317 | const char *name);
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318 | TCGv tcg_temp_new_internal(TCGType type, int temp_local);
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319 | #ifndef VBOX
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320 | static inline TCGv tcg_temp_new(TCGType type)
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321 | #else
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322 | DECLINLINE(TCGv) tcg_temp_new(TCGType type)
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323 | #endif
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324 | {
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325 | return tcg_temp_new_internal(type, 0);
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326 | }
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327 | #ifndef VBOX
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328 | static inline TCGv tcg_temp_local_new(TCGType type)
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329 | #else
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330 | DECLINLINE(TCGv) tcg_temp_local_new(TCGType type)
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331 | #endif
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332 | {
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333 | return tcg_temp_new_internal(type, 1);
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334 | }
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335 | void tcg_temp_free(TCGv arg);
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336 | char *tcg_get_arg_str(TCGContext *s, char *buf, int buf_size, TCGv arg);
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337 | void tcg_dump_info(FILE *f,
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338 | int (*cpu_fprintf)(FILE *f, const char *fmt, ...));
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339 |
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340 | #define TCG_CT_ALIAS 0x80
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341 | #define TCG_CT_IALIAS 0x40
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342 | #define TCG_CT_REG 0x01
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343 | #define TCG_CT_CONST 0x02 /* any constant of register size */
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344 |
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345 | typedef struct TCGArgConstraint {
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346 | uint16_t ct;
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347 | uint8_t alias_index;
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348 | union {
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349 | TCGRegSet regs;
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350 | } u;
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351 | } TCGArgConstraint;
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352 |
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353 | #define TCG_MAX_OP_ARGS 16
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354 |
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355 | #define TCG_OPF_BB_END 0x01 /* instruction defines the end of a basic
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356 | block */
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357 | #define TCG_OPF_CALL_CLOBBER 0x02 /* instruction clobbers call registers
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358 | and potentially update globals. */
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359 | #define TCG_OPF_SIDE_EFFECTS 0x04 /* instruction has side effects : it
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360 | cannot be removed if its output
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361 | are not used */
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362 |
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363 | typedef struct TCGOpDef {
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364 | const char *name;
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365 | uint8_t nb_oargs, nb_iargs, nb_cargs, nb_args;
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366 | uint8_t flags;
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367 | uint16_t copy_size;
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368 | TCGArgConstraint *args_ct;
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369 | int *sorted_args;
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370 | } TCGOpDef;
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371 |
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372 | typedef struct TCGTargetOpDef {
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373 | int op;
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374 | const char *args_ct_str[TCG_MAX_OP_ARGS];
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375 | } TCGTargetOpDef;
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376 |
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377 | extern TCGOpDef tcg_op_defs[];
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378 |
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379 | void tcg_target_init(TCGContext *s);
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380 | void tcg_target_qemu_prologue(TCGContext *s);
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381 |
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382 | #ifndef VBOX
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383 | #define tcg_abort() \
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384 | do {\
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385 | fprintf(stderr, "%s:%d: tcg fatal error\n", __FILE__, __LINE__);\
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386 | abort();\
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387 | } while (0)
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388 | #else
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389 | #define VBOX_STR(x) #x
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390 | #define VBOX_XSTR(x) VBOX_STR(x)
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391 | #define tcg_abort() \
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392 | do {\
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393 | remAbort(-1, "TCG fatal error: "__FILE__":"VBOX_XSTR(__LINE__)); \
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394 | } while (0)
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395 | extern void qemu_qsort(void* base, size_t nmemb, size_t size,
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396 | int(*compar)(const void*, const void*));
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397 | #define tcg_exit(status) \
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398 | do {\
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399 | remAbort(-1, "TCG exit: "__FILE__":"VBOX_XSTR(__LINE__));\
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400 | } while (0)
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401 | #endif
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402 |
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403 | void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs);
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404 |
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405 | void tcg_gen_call(TCGContext *s, TCGv func, unsigned int flags,
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406 | unsigned int nb_rets, const TCGv *rets,
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407 | unsigned int nb_params, const TCGv *args1);
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408 | void tcg_gen_shifti_i64(TCGv ret, TCGv arg1,
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409 | int c, int right, int arith);
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410 |
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411 | /* only used for debugging purposes */
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412 | void tcg_register_helper(void *func, const char *name);
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413 | #define TCG_HELPER(func) tcg_register_helper(func, #func)
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414 | const char *tcg_helper_get_name(TCGContext *s, void *func);
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415 | void tcg_dump_ops(TCGContext *s, FILE *outfile);
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416 |
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417 | void dump_ops(const uint16_t *opc_buf, const TCGArg *opparam_buf);
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418 | TCGv tcg_const_i32(int32_t val);
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419 | TCGv tcg_const_i64(int64_t val);
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420 |
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421 | #if TCG_TARGET_REG_BITS == 32
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422 | #define tcg_const_ptr tcg_const_i32
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423 | #define tcg_add_ptr tcg_add_i32
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424 | #define tcg_sub_ptr tcg_sub_i32
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425 | #else
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426 | #define tcg_const_ptr tcg_const_i64
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427 | #define tcg_add_ptr tcg_add_i64
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428 | #define tcg_sub_ptr tcg_sub_i64
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429 | #endif
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430 |
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431 | void tcg_out_reloc(TCGContext *s, uint8_t *code_ptr, int type,
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432 | int label_index, long addend);
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433 | const TCGArg *tcg_gen_code_op(TCGContext *s, int opc, const TCGArg *args1,
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434 | unsigned int dead_iargs);
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435 |
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436 | const TCGArg *dyngen_op(TCGContext *s, int opc, const TCGArg *opparam_ptr);
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437 |
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438 | /* tcg-runtime.c */
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439 | int64_t tcg_helper_shl_i64(int64_t arg1, int64_t arg2);
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440 | int64_t tcg_helper_shr_i64(int64_t arg1, int64_t arg2);
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441 | int64_t tcg_helper_sar_i64(int64_t arg1, int64_t arg2);
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442 | int64_t tcg_helper_div_i64(int64_t arg1, int64_t arg2);
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443 | int64_t tcg_helper_rem_i64(int64_t arg1, int64_t arg2);
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444 | uint64_t tcg_helper_divu_i64(uint64_t arg1, uint64_t arg2);
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445 | uint64_t tcg_helper_remu_i64(uint64_t arg1, uint64_t arg2);
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446 |
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447 | #ifndef VBOX
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448 | extern uint8_t code_gen_prologue[];
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449 | #else
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450 | extern uint8_t* code_gen_prologue;
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451 | #endif
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452 |
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453 | #if defined(__powerpc__) && !defined(__powerpc64__)
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454 | #define tcg_qemu_tb_exec(tb_ptr) \
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455 | ((long REGPARM __attribute__ ((longcall)) (*)(void *))code_gen_prologue)(tb_ptr)
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456 | #else
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457 |
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458 | #if defined(VBOX) && defined(GCC_WITH_BUGGY_REGPARM)
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459 | #define tcg_qemu_tb_exec(tb_ptr, ret) \
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460 | __asm__ __volatile__("call *%%ecx" : "=a"(ret) : "a"(tb_ptr), "c" (&code_gen_prologue[0]) : "memory", "%edx", "cc")
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461 | #else
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462 | #define tcg_qemu_tb_exec(tb_ptr) ((long REGPARM (*)(void *))code_gen_prologue)(tb_ptr)
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463 | #endif
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464 |
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465 | #endif
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