1 | /*
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2 | * X86 code generator for TCC
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3 | *
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4 | * Copyright (c) 2001-2004 Fabrice Bellard
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5 | *
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6 | * This library is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU Lesser General Public
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8 | * License as published by the Free Software Foundation; either
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9 | * version 2 of the License, or (at your option) any later version.
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10 | *
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11 | * This library is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | * Lesser General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU Lesser General Public
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17 | * License along with this library; if not, write to the Free Software
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18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 | */
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20 |
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21 | #ifdef TARGET_DEFS_ONLY
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22 |
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23 | /* number of available registers */
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24 | #define NB_REGS 4
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25 | #define NB_ASM_REGS 8
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26 |
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27 | /* a register can belong to several classes. The classes must be
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28 | sorted from more general to more precise (see gv2() code which does
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29 | assumptions on it). */
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30 | #define RC_INT 0x0001 /* generic integer register */
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31 | #define RC_FLOAT 0x0002 /* generic float register */
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32 | #define RC_EAX 0x0004
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33 | #define RC_ST0 0x0008
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34 | #define RC_ECX 0x0010
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35 | #define RC_EDX 0x0020
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36 | #define RC_IRET RC_EAX /* function return: integer register */
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37 | #define RC_LRET RC_EDX /* function return: second integer register */
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38 | #define RC_FRET RC_ST0 /* function return: float register */
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39 |
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40 | /* pretty names for the registers */
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41 | enum {
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42 | TREG_EAX = 0,
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43 | TREG_ECX,
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44 | TREG_EDX,
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45 | TREG_ST0,
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46 | };
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47 |
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48 | /* return registers for function */
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49 | #define REG_IRET TREG_EAX /* single word int return register */
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50 | #define REG_LRET TREG_EDX /* second word return register (for long long) */
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51 | #define REG_FRET TREG_ST0 /* float return register */
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52 |
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53 | /* defined if function parameters must be evaluated in reverse order */
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54 | #define INVERT_FUNC_PARAMS
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55 |
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56 | /* defined if structures are passed as pointers. Otherwise structures
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57 | are directly pushed on stack. */
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58 | //#define FUNC_STRUCT_PARAM_AS_PTR
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59 |
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60 | /* pointer size, in bytes */
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61 | #define PTR_SIZE 4
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62 |
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63 | /* long double size and alignment, in bytes */
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64 | #define LDOUBLE_SIZE 12
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65 | #define LDOUBLE_ALIGN 4
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66 | /* maximum alignment (for aligned attribute support) */
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67 | #define MAX_ALIGN 8
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68 |
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69 |
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70 | #define psym oad
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71 |
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72 | /******************************************************/
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73 | /* ELF defines */
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74 |
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75 | #define EM_TCC_TARGET EM_386
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76 |
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77 | /* relocation type for 32 bit data relocation */
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78 | #define R_DATA_32 R_386_32
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79 | #define R_DATA_PTR R_386_32
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80 | #define R_JMP_SLOT R_386_JMP_SLOT
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81 | #define R_COPY R_386_COPY
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82 |
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83 | #define ELF_START_ADDR 0x08048000
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84 | #define ELF_PAGE_SIZE 0x1000
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85 |
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86 | /******************************************************/
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87 | #else /* ! TARGET_DEFS_ONLY */
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88 | /******************************************************/
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89 | #include "tcc.h"
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90 |
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91 | ST_DATA const int reg_classes[NB_REGS] = {
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92 | /* eax */ RC_INT | RC_EAX,
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93 | /* ecx */ RC_INT | RC_ECX,
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94 | /* edx */ RC_INT | RC_EDX,
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95 | /* st0 */ RC_FLOAT | RC_ST0,
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96 | };
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97 |
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98 | static unsigned long func_sub_sp_offset;
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99 | static int func_ret_sub;
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100 | #ifdef CONFIG_TCC_BCHECK
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101 | static unsigned long func_bound_offset;
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102 | #endif
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103 |
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104 | /* XXX: make it faster ? */
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105 | ST_FUNC void g(int c)
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106 | {
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107 | int ind1;
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108 | ind1 = ind + 1;
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109 | if (ind1 > cur_text_section->data_allocated)
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110 | section_realloc(cur_text_section, ind1);
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111 | cur_text_section->data[ind] = c;
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112 | ind = ind1;
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113 | }
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114 |
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115 | ST_FUNC void o(unsigned int c)
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116 | {
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117 | while (c) {
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118 | g(c);
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119 | c = c >> 8;
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120 | }
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121 | }
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122 |
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123 | ST_FUNC void gen_le16(int v)
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124 | {
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125 | g(v);
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126 | g(v >> 8);
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127 | }
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128 |
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129 | ST_FUNC void gen_le32(int c)
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130 | {
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131 | g(c);
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132 | g(c >> 8);
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133 | g(c >> 16);
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134 | g(c >> 24);
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135 | }
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136 |
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137 | /* output a symbol and patch all calls to it */
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138 | ST_FUNC void gsym_addr(int t, int a)
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139 | {
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140 | int n, *ptr;
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141 | while (t) {
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142 | ptr = (int *)(cur_text_section->data + t);
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143 | n = *ptr; /* next value */
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144 | *ptr = a - t - 4;
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145 | t = n;
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146 | }
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147 | }
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148 |
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149 | ST_FUNC void gsym(int t)
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150 | {
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151 | gsym_addr(t, ind);
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152 | }
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153 |
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154 | /* psym is used to put an instruction with a data field which is a
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155 | reference to a symbol. It is in fact the same as oad ! */
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156 | #define psym oad
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157 |
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158 | /* instruction + 4 bytes data. Return the address of the data */
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159 | ST_FUNC int oad(int c, int s)
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160 | {
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161 | int ind1;
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162 |
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163 | o(c);
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164 | ind1 = ind + 4;
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165 | if (ind1 > cur_text_section->data_allocated)
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166 | section_realloc(cur_text_section, ind1);
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167 | *(int *)(cur_text_section->data + ind) = s;
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168 | s = ind;
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169 | ind = ind1;
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170 | return s;
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171 | }
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172 |
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173 | /* output constant with relocation if 'r & VT_SYM' is true */
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174 | ST_FUNC void gen_addr32(int r, Sym *sym, int c)
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175 | {
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176 | if (r & VT_SYM)
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177 | greloc(cur_text_section, sym, ind, R_386_32);
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178 | gen_le32(c);
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179 | }
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180 |
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181 | ST_FUNC void gen_addrpc32(int r, Sym *sym, int c)
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182 | {
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183 | if (r & VT_SYM)
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184 | greloc(cur_text_section, sym, ind, R_386_PC32);
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185 | gen_le32(c - 4);
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186 | }
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187 |
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188 | /* generate a modrm reference. 'op_reg' contains the addtionnal 3
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189 | opcode bits */
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190 | static void gen_modrm(int op_reg, int r, Sym *sym, int c)
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191 | {
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192 | op_reg = op_reg << 3;
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193 | if ((r & VT_VALMASK) == VT_CONST) {
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194 | /* constant memory reference */
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195 | o(0x05 | op_reg);
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196 | gen_addr32(r, sym, c);
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197 | } else if ((r & VT_VALMASK) == VT_LOCAL) {
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198 | /* currently, we use only ebp as base */
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199 | if (c == (char)c) {
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200 | /* short reference */
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201 | o(0x45 | op_reg);
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202 | g(c);
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203 | } else {
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204 | oad(0x85 | op_reg, c);
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205 | }
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206 | } else {
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207 | g(0x00 | op_reg | (r & VT_VALMASK));
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208 | }
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209 | }
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210 |
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211 | /* load 'r' from value 'sv' */
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212 | ST_FUNC void load(int r, SValue *sv)
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213 | {
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214 | int v, t, ft, fc, fr;
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215 | SValue v1;
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216 |
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217 | #ifdef TCC_TARGET_PE
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218 | SValue v2;
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219 | sv = pe_getimport(sv, &v2);
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220 | #endif
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221 |
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222 | fr = sv->r;
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223 | ft = sv->type.t;
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224 | fc = sv->c.ul;
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225 |
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226 | v = fr & VT_VALMASK;
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227 | if (fr & VT_LVAL) {
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228 | if (v == VT_LLOCAL) {
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229 | v1.type.t = VT_INT;
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230 | v1.r = VT_LOCAL | VT_LVAL;
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231 | v1.c.ul = fc;
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232 | fr = r;
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233 | if (!(reg_classes[fr] & RC_INT))
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234 | fr = get_reg(RC_INT);
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235 | load(fr, &v1);
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236 | }
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237 | if ((ft & VT_BTYPE) == VT_FLOAT) {
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238 | o(0xd9); /* flds */
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239 | r = 0;
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240 | } else if ((ft & VT_BTYPE) == VT_DOUBLE) {
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241 | o(0xdd); /* fldl */
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242 | r = 0;
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243 | } else if ((ft & VT_BTYPE) == VT_LDOUBLE) {
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244 | o(0xdb); /* fldt */
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245 | r = 5;
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246 | } else if ((ft & VT_TYPE) == VT_BYTE) {
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247 | o(0xbe0f); /* movsbl */
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248 | } else if ((ft & VT_TYPE) == (VT_BYTE | VT_UNSIGNED)) {
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249 | o(0xb60f); /* movzbl */
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250 | } else if ((ft & VT_TYPE) == VT_SHORT) {
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251 | o(0xbf0f); /* movswl */
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252 | } else if ((ft & VT_TYPE) == (VT_SHORT | VT_UNSIGNED)) {
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253 | o(0xb70f); /* movzwl */
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254 | } else {
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255 | o(0x8b); /* movl */
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256 | }
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257 | gen_modrm(r, fr, sv->sym, fc);
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258 | } else {
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259 | if (v == VT_CONST) {
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260 | o(0xb8 + r); /* mov $xx, r */
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261 | gen_addr32(fr, sv->sym, fc);
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262 | } else if (v == VT_LOCAL) {
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263 | if (fc) {
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264 | o(0x8d); /* lea xxx(%ebp), r */
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265 | gen_modrm(r, VT_LOCAL, sv->sym, fc);
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266 | } else {
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267 | o(0x89);
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268 | o(0xe8 + r); /* mov %ebp, r */
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269 | }
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270 | } else if (v == VT_CMP) {
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271 | oad(0xb8 + r, 0); /* mov $0, r */
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272 | o(0x0f); /* setxx %br */
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273 | o(fc);
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274 | o(0xc0 + r);
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275 | } else if (v == VT_JMP || v == VT_JMPI) {
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276 | t = v & 1;
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277 | oad(0xb8 + r, t); /* mov $1, r */
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278 | o(0x05eb); /* jmp after */
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279 | gsym(fc);
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280 | oad(0xb8 + r, t ^ 1); /* mov $0, r */
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281 | } else if (v != r) {
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282 | o(0x89);
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283 | o(0xc0 + r + v * 8); /* mov v, r */
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284 | }
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285 | }
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286 | }
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287 |
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288 | /* store register 'r' in lvalue 'v' */
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289 | ST_FUNC void store(int r, SValue *v)
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290 | {
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291 | int fr, bt, ft, fc;
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292 |
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293 | #ifdef TCC_TARGET_PE
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294 | SValue v2;
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295 | v = pe_getimport(v, &v2);
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296 | #endif
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297 |
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298 | ft = v->type.t;
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299 | fc = v->c.ul;
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300 | fr = v->r & VT_VALMASK;
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301 | bt = ft & VT_BTYPE;
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302 | /* XXX: incorrect if float reg to reg */
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303 | if (bt == VT_FLOAT) {
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304 | o(0xd9); /* fsts */
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305 | r = 2;
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306 | } else if (bt == VT_DOUBLE) {
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307 | o(0xdd); /* fstpl */
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308 | r = 2;
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309 | } else if (bt == VT_LDOUBLE) {
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310 | o(0xc0d9); /* fld %st(0) */
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311 | o(0xdb); /* fstpt */
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312 | r = 7;
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313 | } else {
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314 | if (bt == VT_SHORT)
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315 | o(0x66);
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316 | if (bt == VT_BYTE || bt == VT_BOOL)
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317 | o(0x88);
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318 | else
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319 | o(0x89);
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320 | }
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321 | if (fr == VT_CONST ||
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322 | fr == VT_LOCAL ||
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323 | (v->r & VT_LVAL)) {
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324 | gen_modrm(r, v->r, v->sym, fc);
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325 | } else if (fr != r) {
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326 | o(0xc0 + fr + r * 8); /* mov r, fr */
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327 | }
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328 | }
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329 |
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330 | static void gadd_sp(int val)
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331 | {
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332 | if (val == (char)val) {
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333 | o(0xc483);
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334 | g(val);
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335 | } else {
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336 | oad(0xc481, val); /* add $xxx, %esp */
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337 | }
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338 | }
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339 |
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340 | /* 'is_jmp' is '1' if it is a jump */
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341 | static void gcall_or_jmp(int is_jmp)
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342 | {
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343 | int r;
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344 | if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
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345 | /* constant case */
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346 | if (vtop->r & VT_SYM) {
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347 | /* relocation case */
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348 | greloc(cur_text_section, vtop->sym,
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349 | ind + 1, R_386_PC32);
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350 | } else {
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351 | /* put an empty PC32 relocation */
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352 | put_elf_reloc(symtab_section, cur_text_section,
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353 | ind + 1, R_386_PC32, 0);
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354 | }
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355 | oad(0xe8 + is_jmp, vtop->c.ul - 4); /* call/jmp im */
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356 | } else {
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357 | /* otherwise, indirect call */
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358 | r = gv(RC_INT);
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359 | o(0xff); /* call/jmp *r */
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360 | o(0xd0 + r + (is_jmp << 4));
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361 | }
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362 | }
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363 |
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364 | static uint8_t fastcall_regs[3] = { TREG_EAX, TREG_EDX, TREG_ECX };
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365 | static uint8_t fastcallw_regs[2] = { TREG_ECX, TREG_EDX };
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366 |
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367 | /* Generate function call. The function address is pushed first, then
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368 | all the parameters in call order. This functions pops all the
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369 | parameters and the function address. */
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370 | ST_FUNC void gfunc_call(int nb_args)
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371 | {
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372 | int size, align, r, args_size, i, func_call;
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373 | Sym *func_sym;
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374 |
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375 | args_size = 0;
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376 | for(i = 0;i < nb_args; i++) {
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377 | if ((vtop->type.t & VT_BTYPE) == VT_STRUCT) {
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378 | size = type_size(&vtop->type, &align);
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379 | /* align to stack align size */
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380 | size = (size + 3) & ~3;
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381 | /* allocate the necessary size on stack */
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382 | oad(0xec81, size); /* sub $xxx, %esp */
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383 | /* generate structure store */
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384 | r = get_reg(RC_INT);
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385 | o(0x89); /* mov %esp, r */
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386 | o(0xe0 + r);
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387 | vset(&vtop->type, r | VT_LVAL, 0);
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388 | vswap();
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389 | vstore();
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390 | args_size += size;
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391 | } else if (is_float(vtop->type.t)) {
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392 | gv(RC_FLOAT); /* only one float register */
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393 | if ((vtop->type.t & VT_BTYPE) == VT_FLOAT)
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394 | size = 4;
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395 | else if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
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396 | size = 8;
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397 | else
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398 | size = 12;
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399 | oad(0xec81, size); /* sub $xxx, %esp */
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400 | if (size == 12)
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401 | o(0x7cdb);
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402 | else
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403 | o(0x5cd9 + size - 4); /* fstp[s|l] 0(%esp) */
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404 | g(0x24);
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405 | g(0x00);
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406 | args_size += size;
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407 | } else {
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408 | /* simple type (currently always same size) */
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409 | /* XXX: implicit cast ? */
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410 | r = gv(RC_INT);
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411 | if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
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412 | size = 8;
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413 | o(0x50 + vtop->r2); /* push r */
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414 | } else {
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415 | size = 4;
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416 | }
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417 | o(0x50 + r); /* push r */
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418 | args_size += size;
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419 | }
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420 | vtop--;
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421 | }
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422 | save_regs(0); /* save used temporary registers */
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423 | func_sym = vtop->type.ref;
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424 | func_call = FUNC_CALL(func_sym->r);
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425 | /* fast call case */
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426 | if ((func_call >= FUNC_FASTCALL1 && func_call <= FUNC_FASTCALL3) ||
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427 | func_call == FUNC_FASTCALLW) {
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428 | int fastcall_nb_regs;
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429 | uint8_t *fastcall_regs_ptr;
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430 | if (func_call == FUNC_FASTCALLW) {
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431 | fastcall_regs_ptr = fastcallw_regs;
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432 | fastcall_nb_regs = 2;
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433 | } else {
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434 | fastcall_regs_ptr = fastcall_regs;
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435 | fastcall_nb_regs = func_call - FUNC_FASTCALL1 + 1;
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436 | }
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437 | for(i = 0;i < fastcall_nb_regs; i++) {
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438 | if (args_size <= 0)
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439 | break;
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440 | o(0x58 + fastcall_regs_ptr[i]); /* pop r */
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441 | /* XXX: incorrect for struct/floats */
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442 | args_size -= 4;
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443 | }
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444 | }
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445 | gcall_or_jmp(0);
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446 |
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447 | #ifdef TCC_TARGET_PE
|
---|
448 | if ((func_sym->type.t & VT_BTYPE) == VT_STRUCT)
|
---|
449 | args_size -= 4;
|
---|
450 | #endif
|
---|
451 | if (args_size && func_call != FUNC_STDCALL)
|
---|
452 | gadd_sp(args_size);
|
---|
453 | vtop--;
|
---|
454 | }
|
---|
455 |
|
---|
456 | #ifdef TCC_TARGET_PE
|
---|
457 | #define FUNC_PROLOG_SIZE 10
|
---|
458 | #else
|
---|
459 | #define FUNC_PROLOG_SIZE 9
|
---|
460 | #endif
|
---|
461 |
|
---|
462 | /* generate function prolog of type 't' */
|
---|
463 | ST_FUNC void gfunc_prolog(CType *func_type)
|
---|
464 | {
|
---|
465 | int addr, align, size, func_call, fastcall_nb_regs;
|
---|
466 | int param_index, param_addr;
|
---|
467 | uint8_t *fastcall_regs_ptr;
|
---|
468 | Sym *sym;
|
---|
469 | CType *type;
|
---|
470 |
|
---|
471 | sym = func_type->ref;
|
---|
472 | func_call = FUNC_CALL(sym->r);
|
---|
473 | addr = 8;
|
---|
474 | loc = 0;
|
---|
475 | func_vc = 0;
|
---|
476 |
|
---|
477 | if (func_call >= FUNC_FASTCALL1 && func_call <= FUNC_FASTCALL3) {
|
---|
478 | fastcall_nb_regs = func_call - FUNC_FASTCALL1 + 1;
|
---|
479 | fastcall_regs_ptr = fastcall_regs;
|
---|
480 | } else if (func_call == FUNC_FASTCALLW) {
|
---|
481 | fastcall_nb_regs = 2;
|
---|
482 | fastcall_regs_ptr = fastcallw_regs;
|
---|
483 | } else {
|
---|
484 | fastcall_nb_regs = 0;
|
---|
485 | fastcall_regs_ptr = NULL;
|
---|
486 | }
|
---|
487 | param_index = 0;
|
---|
488 |
|
---|
489 | ind += FUNC_PROLOG_SIZE;
|
---|
490 | func_sub_sp_offset = ind;
|
---|
491 | /* if the function returns a structure, then add an
|
---|
492 | implicit pointer parameter */
|
---|
493 | func_vt = sym->type;
|
---|
494 | if ((func_vt.t & VT_BTYPE) == VT_STRUCT) {
|
---|
495 | /* XXX: fastcall case ? */
|
---|
496 | func_vc = addr;
|
---|
497 | addr += 4;
|
---|
498 | param_index++;
|
---|
499 | }
|
---|
500 | /* define parameters */
|
---|
501 | while ((sym = sym->next) != NULL) {
|
---|
502 | type = &sym->type;
|
---|
503 | size = type_size(type, &align);
|
---|
504 | size = (size + 3) & ~3;
|
---|
505 | #ifdef FUNC_STRUCT_PARAM_AS_PTR
|
---|
506 | /* structs are passed as pointer */
|
---|
507 | if ((type->t & VT_BTYPE) == VT_STRUCT) {
|
---|
508 | size = 4;
|
---|
509 | }
|
---|
510 | #endif
|
---|
511 | if (param_index < fastcall_nb_regs) {
|
---|
512 | /* save FASTCALL register */
|
---|
513 | loc -= 4;
|
---|
514 | o(0x89); /* movl */
|
---|
515 | gen_modrm(fastcall_regs_ptr[param_index], VT_LOCAL, NULL, loc);
|
---|
516 | param_addr = loc;
|
---|
517 | } else {
|
---|
518 | param_addr = addr;
|
---|
519 | addr += size;
|
---|
520 | }
|
---|
521 | sym_push(sym->v & ~SYM_FIELD, type,
|
---|
522 | VT_LOCAL | lvalue_type(type->t), param_addr);
|
---|
523 | param_index++;
|
---|
524 | }
|
---|
525 | func_ret_sub = 0;
|
---|
526 | /* pascal type call ? */
|
---|
527 | if (func_call == FUNC_STDCALL)
|
---|
528 | func_ret_sub = addr - 8;
|
---|
529 | #ifdef TCC_TARGET_PE
|
---|
530 | else if (func_vc)
|
---|
531 | func_ret_sub = 4;
|
---|
532 | #endif
|
---|
533 |
|
---|
534 | #ifdef CONFIG_TCC_BCHECK
|
---|
535 | /* leave some room for bound checking code */
|
---|
536 | if (tcc_state->do_bounds_check) {
|
---|
537 | oad(0xb8, 0); /* lbound section pointer */
|
---|
538 | oad(0xb8, 0); /* call to function */
|
---|
539 | func_bound_offset = lbounds_section->data_offset;
|
---|
540 | }
|
---|
541 | #endif
|
---|
542 | }
|
---|
543 |
|
---|
544 | /* generate function epilog */
|
---|
545 | ST_FUNC void gfunc_epilog(void)
|
---|
546 | {
|
---|
547 | int v, saved_ind;
|
---|
548 |
|
---|
549 | #ifdef CONFIG_TCC_BCHECK
|
---|
550 | if (tcc_state->do_bounds_check
|
---|
551 | && func_bound_offset != lbounds_section->data_offset) {
|
---|
552 | int saved_ind;
|
---|
553 | int *bounds_ptr;
|
---|
554 | Sym *sym, *sym_data;
|
---|
555 | /* add end of table info */
|
---|
556 | bounds_ptr = section_ptr_add(lbounds_section, sizeof(int));
|
---|
557 | *bounds_ptr = 0;
|
---|
558 | /* generate bound local allocation */
|
---|
559 | saved_ind = ind;
|
---|
560 | ind = func_sub_sp_offset;
|
---|
561 | sym_data = get_sym_ref(&char_pointer_type, lbounds_section,
|
---|
562 | func_bound_offset, lbounds_section->data_offset);
|
---|
563 | greloc(cur_text_section, sym_data,
|
---|
564 | ind + 1, R_386_32);
|
---|
565 | oad(0xb8, 0); /* mov %eax, xxx */
|
---|
566 | sym = external_global_sym(TOK___bound_local_new, &func_old_type, 0);
|
---|
567 | greloc(cur_text_section, sym,
|
---|
568 | ind + 1, R_386_PC32);
|
---|
569 | oad(0xe8, -4);
|
---|
570 | ind = saved_ind;
|
---|
571 | /* generate bound check local freeing */
|
---|
572 | o(0x5250); /* save returned value, if any */
|
---|
573 | greloc(cur_text_section, sym_data,
|
---|
574 | ind + 1, R_386_32);
|
---|
575 | oad(0xb8, 0); /* mov %eax, xxx */
|
---|
576 | sym = external_global_sym(TOK___bound_local_delete, &func_old_type, 0);
|
---|
577 | greloc(cur_text_section, sym,
|
---|
578 | ind + 1, R_386_PC32);
|
---|
579 | oad(0xe8, -4);
|
---|
580 | o(0x585a); /* restore returned value, if any */
|
---|
581 | }
|
---|
582 | #endif
|
---|
583 | o(0xc9); /* leave */
|
---|
584 | if (func_ret_sub == 0) {
|
---|
585 | o(0xc3); /* ret */
|
---|
586 | } else {
|
---|
587 | o(0xc2); /* ret n */
|
---|
588 | g(func_ret_sub);
|
---|
589 | g(func_ret_sub >> 8);
|
---|
590 | }
|
---|
591 | /* align local size to word & save local variables */
|
---|
592 |
|
---|
593 | v = (-loc + 3) & -4;
|
---|
594 | saved_ind = ind;
|
---|
595 | ind = func_sub_sp_offset - FUNC_PROLOG_SIZE;
|
---|
596 | #ifdef TCC_TARGET_PE
|
---|
597 | if (v >= 4096) {
|
---|
598 | Sym *sym = external_global_sym(TOK___chkstk, &func_old_type, 0);
|
---|
599 | oad(0xb8, v); /* mov stacksize, %eax */
|
---|
600 | oad(0xe8, -4); /* call __chkstk, (does the stackframe too) */
|
---|
601 | greloc(cur_text_section, sym, ind-4, R_386_PC32);
|
---|
602 | } else
|
---|
603 | #endif
|
---|
604 | {
|
---|
605 | o(0xe58955); /* push %ebp, mov %esp, %ebp */
|
---|
606 | o(0xec81); /* sub esp, stacksize */
|
---|
607 | gen_le32(v);
|
---|
608 | #if FUNC_PROLOG_SIZE == 10
|
---|
609 | o(0x90); /* adjust to FUNC_PROLOG_SIZE */
|
---|
610 | #endif
|
---|
611 | }
|
---|
612 | ind = saved_ind;
|
---|
613 | }
|
---|
614 |
|
---|
615 | /* generate a jump to a label */
|
---|
616 | ST_FUNC int gjmp(int t)
|
---|
617 | {
|
---|
618 | return psym(0xe9, t);
|
---|
619 | }
|
---|
620 |
|
---|
621 | /* generate a jump to a fixed address */
|
---|
622 | ST_FUNC void gjmp_addr(int a)
|
---|
623 | {
|
---|
624 | int r;
|
---|
625 | r = a - ind - 2;
|
---|
626 | if (r == (char)r) {
|
---|
627 | g(0xeb);
|
---|
628 | g(r);
|
---|
629 | } else {
|
---|
630 | oad(0xe9, a - ind - 5);
|
---|
631 | }
|
---|
632 | }
|
---|
633 |
|
---|
634 | /* generate a test. set 'inv' to invert test. Stack entry is popped */
|
---|
635 | ST_FUNC int gtst(int inv, int t)
|
---|
636 | {
|
---|
637 | int v, *p;
|
---|
638 |
|
---|
639 | v = vtop->r & VT_VALMASK;
|
---|
640 | if (v == VT_CMP) {
|
---|
641 | /* fast case : can jump directly since flags are set */
|
---|
642 | g(0x0f);
|
---|
643 | t = psym((vtop->c.i - 16) ^ inv, t);
|
---|
644 | } else if (v == VT_JMP || v == VT_JMPI) {
|
---|
645 | /* && or || optimization */
|
---|
646 | if ((v & 1) == inv) {
|
---|
647 | /* insert vtop->c jump list in t */
|
---|
648 | p = &vtop->c.i;
|
---|
649 | while (*p != 0)
|
---|
650 | p = (int *)(cur_text_section->data + *p);
|
---|
651 | *p = t;
|
---|
652 | t = vtop->c.i;
|
---|
653 | } else {
|
---|
654 | t = gjmp(t);
|
---|
655 | gsym(vtop->c.i);
|
---|
656 | }
|
---|
657 | } else {
|
---|
658 | if (is_float(vtop->type.t) ||
|
---|
659 | (vtop->type.t & VT_BTYPE) == VT_LLONG) {
|
---|
660 | vpushi(0);
|
---|
661 | gen_op(TOK_NE);
|
---|
662 | }
|
---|
663 | if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
|
---|
664 | /* constant jmp optimization */
|
---|
665 | if ((vtop->c.i != 0) != inv)
|
---|
666 | t = gjmp(t);
|
---|
667 | } else {
|
---|
668 | v = gv(RC_INT);
|
---|
669 | o(0x85);
|
---|
670 | o(0xc0 + v * 9);
|
---|
671 | g(0x0f);
|
---|
672 | t = psym(0x85 ^ inv, t);
|
---|
673 | }
|
---|
674 | }
|
---|
675 | vtop--;
|
---|
676 | return t;
|
---|
677 | }
|
---|
678 |
|
---|
679 | /* generate an integer binary operation */
|
---|
680 | ST_FUNC void gen_opi(int op)
|
---|
681 | {
|
---|
682 | int r, fr, opc, c;
|
---|
683 |
|
---|
684 | switch(op) {
|
---|
685 | case '+':
|
---|
686 | case TOK_ADDC1: /* add with carry generation */
|
---|
687 | opc = 0;
|
---|
688 | gen_op8:
|
---|
689 | if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
|
---|
690 | /* constant case */
|
---|
691 | vswap();
|
---|
692 | r = gv(RC_INT);
|
---|
693 | vswap();
|
---|
694 | c = vtop->c.i;
|
---|
695 | if (c == (char)c) {
|
---|
696 | /* generate inc and dec for smaller code */
|
---|
697 | if (c==1 && opc==0) {
|
---|
698 | o (0x40 | r); // inc
|
---|
699 | } else if (c==1 && opc==5) {
|
---|
700 | o (0x48 | r); // dec
|
---|
701 | } else {
|
---|
702 | o(0x83);
|
---|
703 | o(0xc0 | (opc << 3) | r);
|
---|
704 | g(c);
|
---|
705 | }
|
---|
706 | } else {
|
---|
707 | o(0x81);
|
---|
708 | oad(0xc0 | (opc << 3) | r, c);
|
---|
709 | }
|
---|
710 | } else {
|
---|
711 | gv2(RC_INT, RC_INT);
|
---|
712 | r = vtop[-1].r;
|
---|
713 | fr = vtop[0].r;
|
---|
714 | o((opc << 3) | 0x01);
|
---|
715 | o(0xc0 + r + fr * 8);
|
---|
716 | }
|
---|
717 | vtop--;
|
---|
718 | if (op >= TOK_ULT && op <= TOK_GT) {
|
---|
719 | vtop->r = VT_CMP;
|
---|
720 | vtop->c.i = op;
|
---|
721 | }
|
---|
722 | break;
|
---|
723 | case '-':
|
---|
724 | case TOK_SUBC1: /* sub with carry generation */
|
---|
725 | opc = 5;
|
---|
726 | goto gen_op8;
|
---|
727 | case TOK_ADDC2: /* add with carry use */
|
---|
728 | opc = 2;
|
---|
729 | goto gen_op8;
|
---|
730 | case TOK_SUBC2: /* sub with carry use */
|
---|
731 | opc = 3;
|
---|
732 | goto gen_op8;
|
---|
733 | case '&':
|
---|
734 | opc = 4;
|
---|
735 | goto gen_op8;
|
---|
736 | case '^':
|
---|
737 | opc = 6;
|
---|
738 | goto gen_op8;
|
---|
739 | case '|':
|
---|
740 | opc = 1;
|
---|
741 | goto gen_op8;
|
---|
742 | case '*':
|
---|
743 | gv2(RC_INT, RC_INT);
|
---|
744 | r = vtop[-1].r;
|
---|
745 | fr = vtop[0].r;
|
---|
746 | vtop--;
|
---|
747 | o(0xaf0f); /* imul fr, r */
|
---|
748 | o(0xc0 + fr + r * 8);
|
---|
749 | break;
|
---|
750 | case TOK_SHL:
|
---|
751 | opc = 4;
|
---|
752 | goto gen_shift;
|
---|
753 | case TOK_SHR:
|
---|
754 | opc = 5;
|
---|
755 | goto gen_shift;
|
---|
756 | case TOK_SAR:
|
---|
757 | opc = 7;
|
---|
758 | gen_shift:
|
---|
759 | opc = 0xc0 | (opc << 3);
|
---|
760 | if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
|
---|
761 | /* constant case */
|
---|
762 | vswap();
|
---|
763 | r = gv(RC_INT);
|
---|
764 | vswap();
|
---|
765 | c = vtop->c.i & 0x1f;
|
---|
766 | o(0xc1); /* shl/shr/sar $xxx, r */
|
---|
767 | o(opc | r);
|
---|
768 | g(c);
|
---|
769 | } else {
|
---|
770 | /* we generate the shift in ecx */
|
---|
771 | gv2(RC_INT, RC_ECX);
|
---|
772 | r = vtop[-1].r;
|
---|
773 | o(0xd3); /* shl/shr/sar %cl, r */
|
---|
774 | o(opc | r);
|
---|
775 | }
|
---|
776 | vtop--;
|
---|
777 | break;
|
---|
778 | case '/':
|
---|
779 | case TOK_UDIV:
|
---|
780 | case TOK_PDIV:
|
---|
781 | case '%':
|
---|
782 | case TOK_UMOD:
|
---|
783 | case TOK_UMULL:
|
---|
784 | /* first operand must be in eax */
|
---|
785 | /* XXX: need better constraint for second operand */
|
---|
786 | gv2(RC_EAX, RC_ECX);
|
---|
787 | r = vtop[-1].r;
|
---|
788 | fr = vtop[0].r;
|
---|
789 | vtop--;
|
---|
790 | save_reg(TREG_EDX);
|
---|
791 | if (op == TOK_UMULL) {
|
---|
792 | o(0xf7); /* mul fr */
|
---|
793 | o(0xe0 + fr);
|
---|
794 | vtop->r2 = TREG_EDX;
|
---|
795 | r = TREG_EAX;
|
---|
796 | } else {
|
---|
797 | if (op == TOK_UDIV || op == TOK_UMOD) {
|
---|
798 | o(0xf7d231); /* xor %edx, %edx, div fr, %eax */
|
---|
799 | o(0xf0 + fr);
|
---|
800 | } else {
|
---|
801 | o(0xf799); /* cltd, idiv fr, %eax */
|
---|
802 | o(0xf8 + fr);
|
---|
803 | }
|
---|
804 | if (op == '%' || op == TOK_UMOD)
|
---|
805 | r = TREG_EDX;
|
---|
806 | else
|
---|
807 | r = TREG_EAX;
|
---|
808 | }
|
---|
809 | vtop->r = r;
|
---|
810 | break;
|
---|
811 | default:
|
---|
812 | opc = 7;
|
---|
813 | goto gen_op8;
|
---|
814 | }
|
---|
815 | }
|
---|
816 |
|
---|
817 | /* generate a floating point operation 'v = t1 op t2' instruction. The
|
---|
818 | two operands are guaranted to have the same floating point type */
|
---|
819 | /* XXX: need to use ST1 too */
|
---|
820 | ST_FUNC void gen_opf(int op)
|
---|
821 | {
|
---|
822 | int a, ft, fc, swapped, r;
|
---|
823 |
|
---|
824 | /* convert constants to memory references */
|
---|
825 | if ((vtop[-1].r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
|
---|
826 | vswap();
|
---|
827 | gv(RC_FLOAT);
|
---|
828 | vswap();
|
---|
829 | }
|
---|
830 | if ((vtop[0].r & (VT_VALMASK | VT_LVAL)) == VT_CONST)
|
---|
831 | gv(RC_FLOAT);
|
---|
832 |
|
---|
833 | /* must put at least one value in the floating point register */
|
---|
834 | if ((vtop[-1].r & VT_LVAL) &&
|
---|
835 | (vtop[0].r & VT_LVAL)) {
|
---|
836 | vswap();
|
---|
837 | gv(RC_FLOAT);
|
---|
838 | vswap();
|
---|
839 | }
|
---|
840 | swapped = 0;
|
---|
841 | /* swap the stack if needed so that t1 is the register and t2 is
|
---|
842 | the memory reference */
|
---|
843 | if (vtop[-1].r & VT_LVAL) {
|
---|
844 | vswap();
|
---|
845 | swapped = 1;
|
---|
846 | }
|
---|
847 | if (op >= TOK_ULT && op <= TOK_GT) {
|
---|
848 | /* load on stack second operand */
|
---|
849 | load(TREG_ST0, vtop);
|
---|
850 | save_reg(TREG_EAX); /* eax is used by FP comparison code */
|
---|
851 | if (op == TOK_GE || op == TOK_GT)
|
---|
852 | swapped = !swapped;
|
---|
853 | else if (op == TOK_EQ || op == TOK_NE)
|
---|
854 | swapped = 0;
|
---|
855 | if (swapped)
|
---|
856 | o(0xc9d9); /* fxch %st(1) */
|
---|
857 | o(0xe9da); /* fucompp */
|
---|
858 | o(0xe0df); /* fnstsw %ax */
|
---|
859 | if (op == TOK_EQ) {
|
---|
860 | o(0x45e480); /* and $0x45, %ah */
|
---|
861 | o(0x40fC80); /* cmp $0x40, %ah */
|
---|
862 | } else if (op == TOK_NE) {
|
---|
863 | o(0x45e480); /* and $0x45, %ah */
|
---|
864 | o(0x40f480); /* xor $0x40, %ah */
|
---|
865 | op = TOK_NE;
|
---|
866 | } else if (op == TOK_GE || op == TOK_LE) {
|
---|
867 | o(0x05c4f6); /* test $0x05, %ah */
|
---|
868 | op = TOK_EQ;
|
---|
869 | } else {
|
---|
870 | o(0x45c4f6); /* test $0x45, %ah */
|
---|
871 | op = TOK_EQ;
|
---|
872 | }
|
---|
873 | vtop--;
|
---|
874 | vtop->r = VT_CMP;
|
---|
875 | vtop->c.i = op;
|
---|
876 | } else {
|
---|
877 | /* no memory reference possible for long double operations */
|
---|
878 | if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE) {
|
---|
879 | load(TREG_ST0, vtop);
|
---|
880 | swapped = !swapped;
|
---|
881 | }
|
---|
882 |
|
---|
883 | switch(op) {
|
---|
884 | default:
|
---|
885 | case '+':
|
---|
886 | a = 0;
|
---|
887 | break;
|
---|
888 | case '-':
|
---|
889 | a = 4;
|
---|
890 | if (swapped)
|
---|
891 | a++;
|
---|
892 | break;
|
---|
893 | case '*':
|
---|
894 | a = 1;
|
---|
895 | break;
|
---|
896 | case '/':
|
---|
897 | a = 6;
|
---|
898 | if (swapped)
|
---|
899 | a++;
|
---|
900 | break;
|
---|
901 | }
|
---|
902 | ft = vtop->type.t;
|
---|
903 | fc = vtop->c.ul;
|
---|
904 | if ((ft & VT_BTYPE) == VT_LDOUBLE) {
|
---|
905 | o(0xde); /* fxxxp %st, %st(1) */
|
---|
906 | o(0xc1 + (a << 3));
|
---|
907 | } else {
|
---|
908 | /* if saved lvalue, then we must reload it */
|
---|
909 | r = vtop->r;
|
---|
910 | if ((r & VT_VALMASK) == VT_LLOCAL) {
|
---|
911 | SValue v1;
|
---|
912 | r = get_reg(RC_INT);
|
---|
913 | v1.type.t = VT_INT;
|
---|
914 | v1.r = VT_LOCAL | VT_LVAL;
|
---|
915 | v1.c.ul = fc;
|
---|
916 | load(r, &v1);
|
---|
917 | fc = 0;
|
---|
918 | }
|
---|
919 |
|
---|
920 | if ((ft & VT_BTYPE) == VT_DOUBLE)
|
---|
921 | o(0xdc);
|
---|
922 | else
|
---|
923 | o(0xd8);
|
---|
924 | gen_modrm(a, r, vtop->sym, fc);
|
---|
925 | }
|
---|
926 | vtop--;
|
---|
927 | }
|
---|
928 | }
|
---|
929 |
|
---|
930 | /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
|
---|
931 | and 'long long' cases. */
|
---|
932 | ST_FUNC void gen_cvt_itof(int t)
|
---|
933 | {
|
---|
934 | save_reg(TREG_ST0);
|
---|
935 | gv(RC_INT);
|
---|
936 | if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
|
---|
937 | /* signed long long to float/double/long double (unsigned case
|
---|
938 | is handled generically) */
|
---|
939 | o(0x50 + vtop->r2); /* push r2 */
|
---|
940 | o(0x50 + (vtop->r & VT_VALMASK)); /* push r */
|
---|
941 | o(0x242cdf); /* fildll (%esp) */
|
---|
942 | o(0x08c483); /* add $8, %esp */
|
---|
943 | } else if ((vtop->type.t & (VT_BTYPE | VT_UNSIGNED)) ==
|
---|
944 | (VT_INT | VT_UNSIGNED)) {
|
---|
945 | /* unsigned int to float/double/long double */
|
---|
946 | o(0x6a); /* push $0 */
|
---|
947 | g(0x00);
|
---|
948 | o(0x50 + (vtop->r & VT_VALMASK)); /* push r */
|
---|
949 | o(0x242cdf); /* fildll (%esp) */
|
---|
950 | o(0x08c483); /* add $8, %esp */
|
---|
951 | } else {
|
---|
952 | /* int to float/double/long double */
|
---|
953 | o(0x50 + (vtop->r & VT_VALMASK)); /* push r */
|
---|
954 | o(0x2404db); /* fildl (%esp) */
|
---|
955 | o(0x04c483); /* add $4, %esp */
|
---|
956 | }
|
---|
957 | vtop->r = TREG_ST0;
|
---|
958 | }
|
---|
959 |
|
---|
960 | /* convert fp to int 't' type */
|
---|
961 | /* XXX: handle long long case */
|
---|
962 | ST_FUNC void gen_cvt_ftoi(int t)
|
---|
963 | {
|
---|
964 | int r, r2, size;
|
---|
965 | Sym *sym;
|
---|
966 | CType ushort_type;
|
---|
967 |
|
---|
968 | ushort_type.t = VT_SHORT | VT_UNSIGNED;
|
---|
969 | ushort_type.ref = 0;
|
---|
970 |
|
---|
971 | gv(RC_FLOAT);
|
---|
972 | if (t != VT_INT)
|
---|
973 | size = 8;
|
---|
974 | else
|
---|
975 | size = 4;
|
---|
976 |
|
---|
977 | o(0x2dd9); /* ldcw xxx */
|
---|
978 | sym = external_global_sym(TOK___tcc_int_fpu_control,
|
---|
979 | &ushort_type, VT_LVAL);
|
---|
980 | greloc(cur_text_section, sym,
|
---|
981 | ind, R_386_32);
|
---|
982 | gen_le32(0);
|
---|
983 |
|
---|
984 | oad(0xec81, size); /* sub $xxx, %esp */
|
---|
985 | if (size == 4)
|
---|
986 | o(0x1cdb); /* fistpl */
|
---|
987 | else
|
---|
988 | o(0x3cdf); /* fistpll */
|
---|
989 | o(0x24);
|
---|
990 | o(0x2dd9); /* ldcw xxx */
|
---|
991 | sym = external_global_sym(TOK___tcc_fpu_control,
|
---|
992 | &ushort_type, VT_LVAL);
|
---|
993 | greloc(cur_text_section, sym,
|
---|
994 | ind, R_386_32);
|
---|
995 | gen_le32(0);
|
---|
996 |
|
---|
997 | r = get_reg(RC_INT);
|
---|
998 | o(0x58 + r); /* pop r */
|
---|
999 | if (size == 8) {
|
---|
1000 | if (t == VT_LLONG) {
|
---|
1001 | vtop->r = r; /* mark reg as used */
|
---|
1002 | r2 = get_reg(RC_INT);
|
---|
1003 | o(0x58 + r2); /* pop r2 */
|
---|
1004 | vtop->r2 = r2;
|
---|
1005 | } else {
|
---|
1006 | o(0x04c483); /* add $4, %esp */
|
---|
1007 | }
|
---|
1008 | }
|
---|
1009 | vtop->r = r;
|
---|
1010 | }
|
---|
1011 |
|
---|
1012 | /* convert from one floating point type to another */
|
---|
1013 | ST_FUNC void gen_cvt_ftof(int t)
|
---|
1014 | {
|
---|
1015 | /* all we have to do on i386 is to put the float in a register */
|
---|
1016 | gv(RC_FLOAT);
|
---|
1017 | }
|
---|
1018 |
|
---|
1019 | /* computed goto support */
|
---|
1020 | ST_FUNC void ggoto(void)
|
---|
1021 | {
|
---|
1022 | gcall_or_jmp(1);
|
---|
1023 | vtop--;
|
---|
1024 | }
|
---|
1025 |
|
---|
1026 | /* bound check support functions */
|
---|
1027 | #ifdef CONFIG_TCC_BCHECK
|
---|
1028 |
|
---|
1029 | /* generate a bounded pointer addition */
|
---|
1030 | ST_FUNC void gen_bounded_ptr_add(void)
|
---|
1031 | {
|
---|
1032 | Sym *sym;
|
---|
1033 |
|
---|
1034 | /* prepare fast i386 function call (args in eax and edx) */
|
---|
1035 | gv2(RC_EAX, RC_EDX);
|
---|
1036 | /* save all temporary registers */
|
---|
1037 | vtop -= 2;
|
---|
1038 | save_regs(0);
|
---|
1039 | /* do a fast function call */
|
---|
1040 | sym = external_global_sym(TOK___bound_ptr_add, &func_old_type, 0);
|
---|
1041 | greloc(cur_text_section, sym,
|
---|
1042 | ind + 1, R_386_PC32);
|
---|
1043 | oad(0xe8, -4);
|
---|
1044 | /* returned pointer is in eax */
|
---|
1045 | vtop++;
|
---|
1046 | vtop->r = TREG_EAX | VT_BOUNDED;
|
---|
1047 | /* address of bounding function call point */
|
---|
1048 | vtop->c.ul = (cur_text_section->reloc->data_offset - sizeof(Elf32_Rel));
|
---|
1049 | }
|
---|
1050 |
|
---|
1051 | /* patch pointer addition in vtop so that pointer dereferencing is
|
---|
1052 | also tested */
|
---|
1053 | ST_FUNC void gen_bounded_ptr_deref(void)
|
---|
1054 | {
|
---|
1055 | int func;
|
---|
1056 | int size, align;
|
---|
1057 | Elf32_Rel *rel;
|
---|
1058 | Sym *sym;
|
---|
1059 |
|
---|
1060 | size = 0;
|
---|
1061 | /* XXX: put that code in generic part of tcc */
|
---|
1062 | if (!is_float(vtop->type.t)) {
|
---|
1063 | if (vtop->r & VT_LVAL_BYTE)
|
---|
1064 | size = 1;
|
---|
1065 | else if (vtop->r & VT_LVAL_SHORT)
|
---|
1066 | size = 2;
|
---|
1067 | }
|
---|
1068 | if (!size)
|
---|
1069 | size = type_size(&vtop->type, &align);
|
---|
1070 | switch(size) {
|
---|
1071 | case 1: func = TOK___bound_ptr_indir1; break;
|
---|
1072 | case 2: func = TOK___bound_ptr_indir2; break;
|
---|
1073 | case 4: func = TOK___bound_ptr_indir4; break;
|
---|
1074 | case 8: func = TOK___bound_ptr_indir8; break;
|
---|
1075 | case 12: func = TOK___bound_ptr_indir12; break;
|
---|
1076 | case 16: func = TOK___bound_ptr_indir16; break;
|
---|
1077 | default:
|
---|
1078 | tcc_error("unhandled size when dereferencing bounded pointer");
|
---|
1079 | func = 0;
|
---|
1080 | break;
|
---|
1081 | }
|
---|
1082 |
|
---|
1083 | /* patch relocation */
|
---|
1084 | /* XXX: find a better solution ? */
|
---|
1085 | rel = (Elf32_Rel *)(cur_text_section->reloc->data + vtop->c.ul);
|
---|
1086 | sym = external_global_sym(func, &func_old_type, 0);
|
---|
1087 | if (!sym->c)
|
---|
1088 | put_extern_sym(sym, NULL, 0, 0);
|
---|
1089 | rel->r_info = ELF32_R_INFO(sym->c, ELF32_R_TYPE(rel->r_info));
|
---|
1090 | }
|
---|
1091 | #endif
|
---|
1092 |
|
---|
1093 | /* end of X86 code generator */
|
---|
1094 | /*************************************************************/
|
---|
1095 | #endif
|
---|
1096 | /*************************************************************/
|
---|