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annotate third_party/luajit/src/lj_emit_x86.h @ 279:b3b547563ec7
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Implement the C/Seobeo Google Drive and Gmail connector with encrypted OAuth storage, Zenbu authentication, browser testing, AI tool discovery, chunked HTTP decoding, and Bazel coverage. Consolidate repository guidance into progressive wiki documentation and enforce arena-first allocation for new first-party C code.
Co-authored-by: Copilot <[email protected]>
Copilot-Session: 84c338fd-0939-4bb3-b7f3-1062eb213e5d
| author | MrJuneJune <me@mrjunejune.com> |
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| date | Mon, 17 Aug 2026 22:22:36 -0700 |
| parents | 94705b5986b3 |
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| rev | line source |
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1 /* |
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2 ** x86/x64 instruction emitter. |
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3 ** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h |
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4 */ |
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5 |
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6 /* -- Emit basic instructions --------------------------------------------- */ |
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7 |
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8 #define MODRM(mode, r1, r2) ((MCode)((mode)+(((r1)&7)<<3)+((r2)&7))) |
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9 |
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10 #if LJ_64 |
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11 #define REXRB(p, rr, rb) \ |
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12 { MCode rex = 0x40 + (((rr)>>1)&4) + (((rb)>>3)&1); \ |
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13 if (rex != 0x40) *--(p) = rex; } |
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14 #define FORCE_REX 0x200 |
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15 #define REX_64 (FORCE_REX|0x080000) |
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16 #define VEX_64 0x800000 |
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17 #else |
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18 #define REXRB(p, rr, rb) ((void)0) |
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19 #define FORCE_REX 0 |
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20 #define REX_64 0 |
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21 #define VEX_64 0 |
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22 #endif |
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23 #if LJ_GC64 |
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24 #define REX_GC64 REX_64 |
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25 #else |
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26 #define REX_GC64 0 |
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27 #endif |
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28 |
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29 #define emit_i8(as, i) (*--as->mcp = (MCode)(i)) |
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30 #define emit_i32(as, i) (*(int32_t *)(as->mcp-4) = (i), as->mcp -= 4) |
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31 #define emit_u32(as, u) (*(uint32_t *)(as->mcp-4) = (u), as->mcp -= 4) |
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32 |
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33 #define emit_x87op(as, xo) \ |
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34 (*(uint16_t *)(as->mcp-2) = (uint16_t)(xo), as->mcp -= 2) |
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35 |
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36 /* op */ |
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37 static LJ_AINLINE MCode *emit_op(x86Op xo, Reg rr, Reg rb, Reg rx, |
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38 MCode *p, int delta) |
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39 { |
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40 int n = (int8_t)xo; |
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41 if (n == -60) { /* VEX-encoded instruction */ |
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42 #if LJ_64 |
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43 xo ^= (((rr>>1)&4)+((rx>>2)&2)+((rb>>3)&1))<<13; |
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44 #endif |
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45 *(uint32_t *)(p+delta-5) = (uint32_t)xo; |
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46 return p+delta-5; |
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47 } |
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48 #if defined(__GNUC__) || defined(__clang__) |
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49 if (__builtin_constant_p(xo) && n == -2) |
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50 p[delta-2] = (MCode)(xo >> 24); |
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51 else if (__builtin_constant_p(xo) && n == -3) |
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52 *(uint16_t *)(p+delta-3) = (uint16_t)(xo >> 16); |
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53 else |
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54 #endif |
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55 *(uint32_t *)(p+delta-5) = (uint32_t)xo; |
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56 p += n + delta; |
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57 #if LJ_64 |
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58 { |
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59 uint32_t rex = 0x40 + ((rr>>1)&(4+(FORCE_REX>>1)))+((rx>>2)&2)+((rb>>3)&1); |
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60 if (rex != 0x40) { |
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61 rex |= (rr >> 16); |
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62 if (n == -4) { *p = (MCode)rex; rex = (MCode)(xo >> 8); } |
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63 else if ((xo & 0xffffff) == 0x6600fd) { *p = (MCode)rex; rex = 0x66; } |
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64 *--p = (MCode)rex; |
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65 } |
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66 } |
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67 #else |
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68 UNUSED(rr); UNUSED(rb); UNUSED(rx); |
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69 #endif |
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70 return p; |
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71 } |
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72 |
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73 /* op + modrm */ |
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74 #define emit_opm(xo, mode, rr, rb, p, delta) \ |
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75 (p[(delta)-1] = MODRM((mode), (rr), (rb)), \ |
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76 emit_op((xo), (rr), (rb), 0, (p), (delta))) |
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77 |
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78 /* op + modrm + sib */ |
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79 #define emit_opmx(xo, mode, scale, rr, rb, rx, p) \ |
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80 (p[-1] = MODRM((scale), (rx), (rb)), \ |
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81 p[-2] = MODRM((mode), (rr), RID_ESP), \ |
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82 emit_op((xo), (rr), (rb), (rx), (p), -1)) |
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83 |
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84 /* op r1, r2 */ |
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85 static void emit_rr(ASMState *as, x86Op xo, Reg r1, Reg r2) |
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86 { |
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87 MCode *p = as->mcp; |
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88 as->mcp = emit_opm(xo, XM_REG, r1, r2, p, 0); |
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89 } |
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90 |
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91 #if LJ_64 && defined(LUA_USE_ASSERT) |
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92 /* [addr] is sign-extended in x64 and must be in lower 2G (not 4G). */ |
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93 static int32_t ptr2addr(const void *p) |
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94 { |
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95 lj_assertX((uintptr_t)p < (uintptr_t)0x80000000, "pointer outside 2G range"); |
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96 return i32ptr(p); |
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97 } |
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98 #else |
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99 #define ptr2addr(p) (i32ptr((p))) |
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100 #endif |
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101 |
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102 /* op r, [base+ofs] */ |
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103 static void emit_rmro(ASMState *as, x86Op xo, Reg rr, Reg rb, int32_t ofs) |
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104 { |
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105 MCode *p = as->mcp; |
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106 x86Mode mode; |
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107 if (ra_hasreg(rb)) { |
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108 if (LJ_GC64 && rb == RID_RIP) { |
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109 mode = XM_OFS0; |
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110 p -= 4; |
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111 *(int32_t *)p = ofs; |
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112 } else if (ofs == 0 && (rb&7) != RID_EBP) { |
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113 mode = XM_OFS0; |
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114 } else if (checki8(ofs)) { |
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115 *--p = (MCode)ofs; |
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116 mode = XM_OFS8; |
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117 } else { |
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118 p -= 4; |
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119 *(int32_t *)p = ofs; |
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120 mode = XM_OFS32; |
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121 } |
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122 if ((rb&7) == RID_ESP) |
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123 *--p = MODRM(XM_SCALE1, RID_ESP, RID_ESP); |
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124 } else { |
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125 *(int32_t *)(p-4) = ofs; |
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126 #if LJ_64 |
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127 p[-5] = MODRM(XM_SCALE1, RID_ESP, RID_EBP); |
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128 p -= 5; |
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129 rb = RID_ESP; |
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130 #else |
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131 p -= 4; |
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132 rb = RID_EBP; |
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133 #endif |
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134 mode = XM_OFS0; |
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135 } |
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136 as->mcp = emit_opm(xo, mode, rr, rb, p, 0); |
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137 } |
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138 |
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139 /* op r, [base+idx*scale+ofs] */ |
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140 static void emit_rmrxo(ASMState *as, x86Op xo, Reg rr, Reg rb, Reg rx, |
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141 x86Mode scale, int32_t ofs) |
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142 { |
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143 MCode *p = as->mcp; |
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144 x86Mode mode; |
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145 if (ofs == 0 && (rb&7) != RID_EBP) { |
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146 mode = XM_OFS0; |
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147 } else if (checki8(ofs)) { |
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148 mode = XM_OFS8; |
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149 *--p = (MCode)ofs; |
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150 } else { |
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151 mode = XM_OFS32; |
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152 p -= 4; |
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153 *(int32_t *)p = ofs; |
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154 } |
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155 as->mcp = emit_opmx(xo, mode, scale, rr, rb, rx, p); |
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156 } |
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157 |
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158 /* op r, i */ |
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159 static void emit_gri(ASMState *as, x86Group xg, Reg rb, int32_t i) |
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160 { |
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161 MCode *p = as->mcp; |
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162 x86Op xo; |
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163 if (checki8(i)) { |
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164 *--p = (MCode)i; |
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165 xo = XG_TOXOi8(xg); |
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166 } else { |
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167 p -= 4; |
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168 *(int32_t *)p = i; |
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169 xo = XG_TOXOi(xg); |
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170 } |
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171 as->mcp = emit_opm(xo, XM_REG, (Reg)(xg & 7) | (rb & REX_64), rb, p, 0); |
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172 } |
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173 |
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174 /* op [base+ofs], i */ |
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175 static void emit_gmroi(ASMState *as, x86Group xg, Reg rb, int32_t ofs, |
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176 int32_t i) |
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177 { |
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178 x86Op xo; |
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179 if (checki8(i)) { |
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180 emit_i8(as, i); |
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181 xo = XG_TOXOi8(xg); |
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182 } else { |
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183 emit_i32(as, i); |
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184 xo = XG_TOXOi(xg); |
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185 } |
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186 emit_rmro(as, xo, (Reg)(xg & 7), rb, ofs); |
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187 } |
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188 |
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189 #define emit_shifti(as, xg, r, i) \ |
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190 (emit_i8(as, (i)), emit_rr(as, XO_SHIFTi, (Reg)(xg), (r))) |
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191 |
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192 /* op r, rm/mrm */ |
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193 static void emit_mrm(ASMState *as, x86Op xo, Reg rr, Reg rb) |
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194 { |
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195 MCode *p = as->mcp; |
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196 x86Mode mode = XM_REG; |
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197 if (rb == RID_MRM) { |
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198 rb = as->mrm.base; |
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199 if (rb == RID_NONE) { |
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200 rb = RID_EBP; |
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201 mode = XM_OFS0; |
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202 p -= 4; |
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203 *(int32_t *)p = as->mrm.ofs; |
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204 if (as->mrm.idx != RID_NONE) |
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205 goto mrmidx; |
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206 #if LJ_64 |
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207 *--p = MODRM(XM_SCALE1, RID_ESP, RID_EBP); |
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208 rb = RID_ESP; |
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209 #endif |
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210 } else if (LJ_GC64 && rb == RID_RIP) { |
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211 lj_assertA(as->mrm.idx == RID_NONE, "RIP-rel mrm cannot have index"); |
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212 mode = XM_OFS0; |
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213 p -= 4; |
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214 *(int32_t *)p = as->mrm.ofs; |
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215 } else { |
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216 if (as->mrm.ofs == 0 && (rb&7) != RID_EBP) { |
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217 mode = XM_OFS0; |
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218 } else if (checki8(as->mrm.ofs)) { |
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219 *--p = (MCode)as->mrm.ofs; |
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220 mode = XM_OFS8; |
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221 } else { |
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222 p -= 4; |
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223 *(int32_t *)p = as->mrm.ofs; |
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224 mode = XM_OFS32; |
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225 } |
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226 if (as->mrm.idx != RID_NONE) { |
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227 mrmidx: |
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228 as->mcp = emit_opmx(xo, mode, as->mrm.scale, rr, rb, as->mrm.idx, p); |
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229 return; |
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230 } |
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231 if ((rb&7) == RID_ESP) |
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232 *--p = MODRM(XM_SCALE1, RID_ESP, RID_ESP); |
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233 } |
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234 } |
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235 as->mcp = emit_opm(xo, mode, rr, rb, p, 0); |
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236 } |
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237 |
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238 /* op rm/mrm, i */ |
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239 static void emit_gmrmi(ASMState *as, x86Group xg, Reg rb, int32_t i) |
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240 { |
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241 x86Op xo; |
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242 if (checki8(i)) { |
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243 emit_i8(as, i); |
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244 xo = XG_TOXOi8(xg); |
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245 } else { |
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246 emit_i32(as, i); |
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247 xo = XG_TOXOi(xg); |
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248 } |
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249 emit_mrm(as, xo, (Reg)(xg & 7) | (rb & REX_64), (rb & ~REX_64)); |
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250 } |
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251 |
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252 /* -- Emit loads/stores --------------------------------------------------- */ |
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253 |
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254 /* mov [base+ofs], i */ |
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255 static void emit_movmroi(ASMState *as, Reg base, int32_t ofs, int32_t i) |
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256 { |
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257 emit_i32(as, i); |
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258 emit_rmro(as, XO_MOVmi, 0, base, ofs); |
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259 } |
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260 |
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261 /* mov [base+ofs], r */ |
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262 #define emit_movtomro(as, r, base, ofs) \ |
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263 emit_rmro(as, XO_MOVto, (r), (base), (ofs)) |
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264 |
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265 /* Get/set global_State fields. */ |
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266 #define emit_opgl(as, xo, r, field) \ |
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267 emit_rma(as, (xo), (r), (void *)&J2G(as->J)->field) |
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268 #define emit_getgl(as, r, field) emit_opgl(as, XO_MOV, (r)|REX_GC64, field) |
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269 #define emit_setgl(as, r, field) emit_opgl(as, XO_MOVto, (r)|REX_GC64, field) |
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270 |
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271 #define emit_setvmstate(as, i) \ |
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272 (emit_i32(as, i), emit_opgl(as, XO_MOVmi, 0, vmstate)) |
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273 |
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274 /* mov r, i / xor r, r */ |
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275 static void emit_loadi(ASMState *as, Reg r, int32_t i) |
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276 { |
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277 /* XOR r,r is shorter, but modifies the flags. This is bad for HIOP/jcc. */ |
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278 if (i == 0 && !(LJ_32 && (IR(as->curins)->o == IR_HIOP || |
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279 (as->curins+1 < as->T->nins && |
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280 IR(as->curins+1)->o == IR_HIOP))) && |
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281 !((*as->mcp == 0x0f && (as->mcp[1] & 0xf0) == XI_JCCn) || |
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282 (*as->mcp & 0xf0) == XI_JCCs)) { |
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283 emit_rr(as, XO_ARITH(XOg_XOR), r, r); |
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284 } else { |
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285 MCode *p = as->mcp; |
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286 *(int32_t *)(p-4) = i; |
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287 p[-5] = (MCode)(XI_MOVri+(r&7)); |
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288 p -= 5; |
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289 REXRB(p, 0, r); |
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290 as->mcp = p; |
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291 } |
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292 } |
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293 |
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294 #if LJ_GC64 |
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295 #define dispofs(as, k) \ |
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296 ((intptr_t)((uintptr_t)(k) - (uintptr_t)J2GG(as->J)->dispatch)) |
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297 #define mcpofs(as, k) \ |
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298 ((intptr_t)((uintptr_t)(k) - (uintptr_t)as->mcp)) |
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299 #define mctopofs(as, k) \ |
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300 ((intptr_t)((uintptr_t)(k) - (uintptr_t)as->mctop)) |
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301 /* mov r, addr */ |
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302 #define emit_loada(as, r, addr) \ |
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303 emit_loadu64(as, (r), (uintptr_t)(addr)) |
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304 #else |
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305 /* mov r, addr */ |
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306 #define emit_loada(as, r, addr) \ |
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307 emit_loadi(as, (r), ptr2addr((addr))) |
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308 #endif |
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309 |
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310 #if LJ_64 |
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311 /* mov r, imm64 or shorter 32 bit extended load. */ |
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312 static void emit_loadu64(ASMState *as, Reg r, uint64_t u64) |
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313 { |
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314 if (checku32(u64)) { /* 32 bit load clears upper 32 bits. */ |
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315 emit_loadi(as, r, (int32_t)u64); |
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316 } else if (checki32((int64_t)u64)) { /* Sign-extended 32 bit load. */ |
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317 MCode *p = as->mcp; |
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318 *(int32_t *)(p-4) = (int32_t)u64; |
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319 as->mcp = emit_opm(XO_MOVmi, XM_REG, REX_64, r, p, -4); |
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320 #if LJ_GC64 |
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321 } else if (checki32(dispofs(as, u64))) { |
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322 emit_rmro(as, XO_LEA, r|REX_64, RID_DISPATCH, (int32_t)dispofs(as, u64)); |
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323 } else if (checki32(mcpofs(as, u64)) && checki32(mctopofs(as, u64))) { |
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324 /* Since as->realign assumes the code size doesn't change, check |
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325 ** RIP-relative addressing reachability for both as->mcp and as->mctop. |
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326 */ |
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327 emit_rmro(as, XO_LEA, r|REX_64, RID_RIP, (int32_t)mcpofs(as, u64)); |
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328 #endif |
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329 } else { /* Full-size 64 bit load. */ |
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330 MCode *p = as->mcp; |
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331 *(uint64_t *)(p-8) = u64; |
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332 p[-9] = (MCode)(XI_MOVri+(r&7)); |
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333 p[-10] = 0x48 + ((r>>3)&1); |
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334 p -= 10; |
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335 as->mcp = p; |
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336 } |
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337 } |
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338 #endif |
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339 |
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340 /* op r, [addr] */ |
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341 static void emit_rma(ASMState *as, x86Op xo, Reg rr, const void *addr) |
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342 { |
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343 #if LJ_GC64 |
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344 if (checki32(dispofs(as, addr))) { |
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345 emit_rmro(as, xo, rr, RID_DISPATCH, (int32_t)dispofs(as, addr)); |
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346 } else if (checki32(mcpofs(as, addr)) && checki32(mctopofs(as, addr))) { |
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347 emit_rmro(as, xo, rr, RID_RIP, (int32_t)mcpofs(as, addr)); |
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348 } else if (!checki32((intptr_t)addr)) { |
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349 Reg ra = (rr & 15); |
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350 if (xo != XO_MOV) { |
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351 /* We can't allocate a register here. Use and restore DISPATCH. Ugly. */ |
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352 uint64_t dispaddr = (uintptr_t)J2GG(as->J)->dispatch; |
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353 uint8_t i8 = xo == XO_GROUP3b ? *as->mcp++ : 0; |
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354 ra = RID_DISPATCH; |
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355 if (checku32(dispaddr)) { |
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356 emit_loadi(as, ra, (int32_t)dispaddr); |
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357 } else { /* Full-size 64 bit load. */ |
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358 MCode *p = as->mcp; |
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359 *(uint64_t *)(p-8) = dispaddr; |
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360 p[-9] = (MCode)(XI_MOVri+(ra&7)); |
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361 p[-10] = 0x48 + ((ra>>3)&1); |
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362 p -= 10; |
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363 as->mcp = p; |
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364 } |
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365 if (xo == XO_GROUP3b) emit_i8(as, i8); |
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366 } |
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367 emit_rmro(as, xo, rr, ra, 0); |
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368 emit_loadu64(as, ra, (uintptr_t)addr); |
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369 } else |
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370 #endif |
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371 { |
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372 MCode *p = as->mcp; |
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373 *(int32_t *)(p-4) = ptr2addr(addr); |
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374 #if LJ_64 |
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375 p[-5] = MODRM(XM_SCALE1, RID_ESP, RID_EBP); |
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376 as->mcp = emit_opm(xo, XM_OFS0, rr, RID_ESP, p, -5); |
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377 #else |
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378 as->mcp = emit_opm(xo, XM_OFS0, rr, RID_EBP, p, -4); |
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379 #endif |
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380 } |
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381 } |
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382 |
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383 /* Load 64 bit IR constant into register. */ |
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384 static void emit_loadk64(ASMState *as, Reg r, IRIns *ir) |
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385 { |
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386 Reg r64; |
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387 x86Op xo; |
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388 const uint64_t *k = &ir_k64(ir)->u64; |
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389 if (rset_test(RSET_FPR, r)) { |
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390 r64 = r; |
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391 xo = XO_MOVSD; |
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392 } else { |
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393 r64 = r | REX_64; |
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394 xo = XO_MOV; |
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395 } |
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396 if (*k == 0) { |
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397 emit_rr(as, rset_test(RSET_FPR, r) ? XO_XORPS : XO_ARITH(XOg_XOR), r, r); |
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398 #if LJ_GC64 |
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399 } else if (checki32((intptr_t)k) || checki32(dispofs(as, k)) || |
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400 (checki32(mcpofs(as, k)) && checki32(mctopofs(as, k)))) { |
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401 emit_rma(as, xo, r64, k); |
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402 } else { |
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403 if (ir->i) { |
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404 lj_assertA(*k == *(uint64_t*)(as->mctop - ir->i), |
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405 "bad interned 64 bit constant"); |
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406 } else if (as->curins <= as->stopins && rset_test(RSET_GPR, r)) { |
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407 emit_loadu64(as, r, *k); |
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408 return; |
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409 } else { |
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410 /* If all else fails, add the FP constant at the MCode area bottom. */ |
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411 while ((uintptr_t)as->mcbot & 7) *as->mcbot++ = XI_INT3; |
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412 *(uint64_t *)as->mcbot = *k; |
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413 ir->i = (int32_t)(as->mctop - as->mcbot); |
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414 as->mcbot += 8; |
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415 as->mclim = as->mcbot + MCLIM_REDZONE; |
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416 lj_mcode_commitbot(as->J, as->mcbot); |
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417 } |
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418 emit_rmro(as, xo, r64, RID_RIP, (int32_t)mcpofs(as, as->mctop - ir->i)); |
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419 #else |
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420 } else { |
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421 emit_rma(as, xo, r64, k); |
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422 #endif |
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423 } |
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424 } |
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425 |
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426 /* -- Emit control-flow instructions -------------------------------------- */ |
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427 |
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428 /* Label for short jumps. */ |
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429 typedef MCode *MCLabel; |
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
430 |
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parents:
diff
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|
431 #if LJ_32 && LJ_HASFFI |
|
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parents:
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432 /* jmp short target */ |
|
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parents:
diff
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|
433 static void emit_sjmp(ASMState *as, MCLabel target) |
|
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parents:
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|
434 { |
|
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parents:
diff
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|
435 MCode *p = as->mcp; |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
436 ptrdiff_t delta = target - p; |
|
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parents:
diff
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|
437 lj_assertA(delta == (int8_t)delta, "short jump target out of range"); |
|
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parents:
diff
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|
438 p[-1] = (MCode)(int8_t)delta; |
|
94705b5986b3
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parents:
diff
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|
439 p[-2] = XI_JMPs; |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
440 as->mcp = p - 2; |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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441 } |
|
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parents:
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442 #endif |
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parents:
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|
443 |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
444 /* jcc short target */ |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
445 static void emit_sjcc(ASMState *as, int cc, MCLabel target) |
|
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parents:
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446 { |
|
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parents:
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|
447 MCode *p = as->mcp; |
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parents:
diff
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|
448 ptrdiff_t delta = target - p; |
|
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parents:
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449 lj_assertA(delta == (int8_t)delta, "short jump target out of range"); |
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parents:
diff
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450 p[-1] = (MCode)(int8_t)delta; |
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parents:
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451 p[-2] = (MCode)(XI_JCCs+(cc&15)); |
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parents:
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452 as->mcp = p - 2; |
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parents:
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453 } |
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parents:
diff
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454 |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
455 /* jcc short (pending target) */ |
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MrJuneJune <me@mrjunejune.com>
parents:
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|
456 static MCLabel emit_sjcc_label(ASMState *as, int cc) |
|
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parents:
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457 { |
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parents:
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458 MCode *p = as->mcp; |
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parents:
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|
459 p[-1] = 0; |
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parents:
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|
460 p[-2] = (MCode)(XI_JCCs+(cc&15)); |
|
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parents:
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461 as->mcp = p - 2; |
|
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parents:
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462 return p; |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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463 } |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
464 |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
465 /* Fixup jcc short target. */ |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
466 static void emit_sfixup(ASMState *as, MCLabel source) |
|
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MrJuneJune <me@mrjunejune.com>
parents:
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|
467 { |
|
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parents:
diff
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|
468 source[-1] = (MCode)(as->mcp-source); |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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469 } |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
470 |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
471 /* Return label pointing to current PC. */ |
|
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MrJuneJune <me@mrjunejune.com>
parents:
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472 #define emit_label(as) ((as)->mcp) |
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
473 |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
474 /* Compute relative 32 bit offset for jump and call instructions. */ |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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475 static LJ_AINLINE int32_t jmprel(jit_State *J, MCode *p, MCode *target) |
|
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parents:
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476 { |
|
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parents:
diff
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|
477 ptrdiff_t delta = target - p; |
|
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parents:
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478 UNUSED(J); |
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parents:
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479 lj_assertJ(delta == (int32_t)delta, "jump target out of range"); |
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parents:
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480 return (int32_t)delta; |
|
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parents:
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481 } |
|
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parents:
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|
482 |
|
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MrJuneJune <me@mrjunejune.com>
parents:
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|
483 /* jcc target */ |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
484 static void emit_jcc(ASMState *as, int cc, MCode *target) |
|
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parents:
diff
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|
485 { |
|
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parents:
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486 MCode *p = as->mcp; |
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MrJuneJune <me@mrjunejune.com>
parents:
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487 *(int32_t *)(p-4) = jmprel(as->J, p, target); |
|
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parents:
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488 p[-5] = (MCode)(XI_JCCn+(cc&15)); |
|
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parents:
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489 p[-6] = 0x0f; |
|
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parents:
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|
490 as->mcp = p - 6; |
|
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parents:
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|
491 } |
|
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parents:
diff
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|
492 |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
493 /* jmp target */ |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
494 static void emit_jmp(ASMState *as, MCode *target) |
|
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parents:
diff
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|
495 { |
|
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parents:
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496 MCode *p = as->mcp; |
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parents:
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497 *(int32_t *)(p-4) = jmprel(as->J, p, target); |
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parents:
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498 p[-5] = XI_JMP; |
|
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parents:
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|
499 as->mcp = p - 5; |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
500 } |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
501 |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
502 /* call target */ |
|
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parents:
diff
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|
503 static void emit_call_(ASMState *as, MCode *target) |
|
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parents:
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|
504 { |
|
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parents:
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|
505 MCode *p = as->mcp; |
|
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parents:
diff
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|
506 #if LJ_64 |
|
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parents:
diff
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|
507 if (target-p != (int32_t)(target-p)) { |
|
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parents:
diff
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|
508 /* Assumes RID_RET is never an argument to calls and always clobbered. */ |
|
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parents:
diff
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|
509 emit_rr(as, XO_GROUP5, XOg_CALL, RID_RET); |
|
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parents:
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|
510 emit_loadu64(as, RID_RET, (uint64_t)target); |
|
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parents:
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511 return; |
|
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parents:
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512 } |
|
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parents:
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|
513 #endif |
|
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parents:
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514 *(int32_t *)(p-4) = jmprel(as->J, p, target); |
|
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parents:
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|
515 p[-5] = XI_CALL; |
|
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parents:
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516 as->mcp = p - 5; |
|
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parents:
diff
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|
517 } |
|
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parents:
diff
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|
518 |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
519 #define emit_call(as, f) emit_call_(as, (MCode *)(void *)(f)) |
|
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parents:
diff
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|
520 |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
521 /* -- Emit generic operations --------------------------------------------- */ |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
522 |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
523 /* Use 64 bit operations to handle 64 bit IR types. */ |
|
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parents:
diff
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|
524 #if LJ_64 |
|
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parents:
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525 #define REX_64IR(ir, r) ((r) + (irt_is64((ir)->t) ? REX_64 : 0)) |
|
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parents:
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526 #define VEX_64IR(ir, r) ((r) + (irt_is64((ir)->t) ? VEX_64 : 0)) |
|
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parents:
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|
527 #else |
|
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parents:
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528 #define REX_64IR(ir, r) (r) |
|
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parents:
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529 #define VEX_64IR(ir, r) (r) |
|
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parents:
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|
530 #endif |
|
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parents:
diff
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|
531 |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
532 /* Generic move between two regs. */ |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
533 static void emit_movrr(ASMState *as, IRIns *ir, Reg dst, Reg src) |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
534 { |
|
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parents:
diff
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|
535 UNUSED(ir); |
|
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parents:
diff
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|
536 if (dst < RID_MAX_GPR) |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
537 emit_rr(as, XO_MOV, REX_64IR(ir, dst), src); |
|
94705b5986b3
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
538 else |
|
94705b5986b3
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
539 emit_rr(as, XO_MOVAPS, dst, src); |
|
94705b5986b3
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
540 } |
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541 |
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542 /* Generic load of register with base and (small) offset address. */ |
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543 static void emit_loadofs(ASMState *as, IRIns *ir, Reg r, Reg base, int32_t ofs) |
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544 { |
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545 if (r < RID_MAX_GPR) |
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546 emit_rmro(as, XO_MOV, REX_64IR(ir, r), base, ofs); |
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547 else |
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548 emit_rmro(as, irt_isnum(ir->t) ? XO_MOVSD : XO_MOVSS, r, base, ofs); |
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549 } |
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550 |
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551 /* Generic store of register with base and (small) offset address. */ |
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552 static void emit_storeofs(ASMState *as, IRIns *ir, Reg r, Reg base, int32_t ofs) |
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553 { |
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554 if (r < RID_MAX_GPR) |
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555 emit_rmro(as, XO_MOVto, REX_64IR(ir, r), base, ofs); |
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556 else |
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557 emit_rmro(as, irt_isnum(ir->t) ? XO_MOVSDto : XO_MOVSSto, r, base, ofs); |
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558 } |
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559 |
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560 /* Add offset to pointer. */ |
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561 static void emit_addptr(ASMState *as, Reg r, int32_t ofs) |
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562 { |
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563 if (ofs) { |
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564 emit_gri(as, XG_ARITHi(XOg_ADD), r|REX_GC64, ofs); |
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565 } |
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566 } |
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567 |
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568 #define emit_spsub(as, ofs) emit_addptr(as, RID_ESP|REX_64, -(ofs)) |
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569 |
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570 /* Prefer rematerialization of BASE/L from global_State over spills. */ |
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571 #define emit_canremat(ref) ((ref) <= REF_BASE) |
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572 |