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comparison gen_x86.c @ 692:e11e68918691

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Fix bug in map_native_address that was breaking some self-modifying code in Gunstar Heroes
author Michael Pavone <pavone@retrodev.com>
date Tue, 28 Apr 2015 19:04:36 -0700
parents 74d636e85bf8
children cb1c005880e7
comparison
equal deleted inserted replaced
691:74d636e85bf8 692:e11e68918691
2133 code++; 2133 code++;
2134 } 2134 }
2135 if (has_modrm(prefix, main_op)) { 2135 if (has_modrm(prefix, main_op)) {
2136 uint8_t mod_rm = *(code++); 2136 uint8_t mod_rm = *(code++);
2137 if (has_sib(mod_rm)) { 2137 if (has_sib(mod_rm)) {
2138 uint8_t sib = *(code++); 2138 //sib takes up a byte, but can't add any additional ones beyond that
2139 } else { 2139 code++;
2140 2140 }
2141 uint8_t mode = mod_rm & 0xC0;
2142 uint8_t rm = mod_rm & 3;
2143 if (mode == MODE_REG_DISPLACE8) {
2144 code++;
2145 } else if (mode == MODE_REG_DISPLACE32 || (mode == MODE_REG_INDIRECT && rm == RBP)) {
2146 code += 4;
2141 } 2147 }
2142 } else { 2148 } else {
2143 } 2149 }
2144 2150
2145 return code-start; 2151 return code-start;