H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 1 | /* disasm.c where all the _work_ gets done in the Netwide Disassembler |
| 2 | * |
| 3 | * The Netwide Assembler is copyright (C) 1996 Simon Tatham and |
| 4 | * Julian Hall. All rights reserved. The software is |
| 5 | * redistributable under the licence given in the file "Licence" |
| 6 | * distributed in the NASM archive. |
| 7 | * |
| 8 | * initial version 27/iii/95 by Simon Tatham |
| 9 | */ |
| 10 | |
| 11 | #include <stdio.h> |
| 12 | #include <string.h> |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 13 | #include <inttypes.h> |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 14 | |
| 15 | #include "nasm.h" |
| 16 | #include "disasm.h" |
| 17 | #include "sync.h" |
| 18 | #include "insns.h" |
| 19 | |
| 20 | #include "names.c" |
| 21 | |
| 22 | extern struct itemplate **itable[]; |
| 23 | |
| 24 | /* |
| 25 | * Flags that go into the `segment' field of `insn' structures |
| 26 | * during disassembly. |
| 27 | */ |
| 28 | #define SEG_RELATIVE 1 |
| 29 | #define SEG_32BIT 2 |
| 30 | #define SEG_RMREG 4 |
| 31 | #define SEG_DISP8 8 |
| 32 | #define SEG_DISP16 16 |
| 33 | #define SEG_DISP32 32 |
| 34 | #define SEG_NODISP 64 |
| 35 | #define SEG_SIGNED 128 |
| 36 | |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 37 | static int whichreg(int32_t regflags, int regval) |
H. Peter Anvin | eba20a7 | 2002-04-30 20:53:55 +0000 | [diff] [blame] | 38 | { |
H. Peter Anvin | 232badb | 2002-06-06 02:41:20 +0000 | [diff] [blame] | 39 | #include "regdis.c" |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 40 | |
| 41 | if (!(REG_AL & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 42 | return R_AL; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 43 | if (!(REG_AX & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 44 | return R_AX; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 45 | if (!(REG_EAX & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 46 | return R_EAX; |
H. Peter Anvin | 10101f2 | 2003-02-24 23:22:45 +0000 | [diff] [blame] | 47 | if (!(REG_DL & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 48 | return R_DL; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 49 | if (!(REG_DX & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 50 | return R_DX; |
H. Peter Anvin | 10101f2 | 2003-02-24 23:22:45 +0000 | [diff] [blame] | 51 | if (!(REG_EDX & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 52 | return R_EDX; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 53 | if (!(REG_CL & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 54 | return R_CL; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 55 | if (!(REG_CX & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 56 | return R_CX; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 57 | if (!(REG_ECX & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 58 | return R_ECX; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 59 | if (!(FPU0 & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 60 | return R_ST0; |
H. Peter Anvin | d7ed89e | 2002-04-30 20:52:08 +0000 | [diff] [blame] | 61 | if (!(REG_CS & ~regflags)) |
H. Peter Anvin | 232badb | 2002-06-06 02:41:20 +0000 | [diff] [blame] | 62 | return (regval == 1) ? R_CS : 0; |
H. Peter Anvin | 76690a1 | 2002-04-30 20:52:49 +0000 | [diff] [blame] | 63 | if (!(REG_DESS & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 64 | return (regval == 0 || regval == 2 |
| 65 | || regval == 3 ? sreg[regval] : 0); |
H. Peter Anvin | 76690a1 | 2002-04-30 20:52:49 +0000 | [diff] [blame] | 66 | if (!(REG_FSGS & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 67 | return (regval == 4 || regval == 5 ? sreg[regval] : 0); |
H. Peter Anvin | 232badb | 2002-06-06 02:41:20 +0000 | [diff] [blame] | 68 | if (!(REG_SEG67 & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 69 | return (regval == 6 || regval == 7 ? sreg[regval] : 0); |
H. Peter Anvin | 232badb | 2002-06-06 02:41:20 +0000 | [diff] [blame] | 70 | |
| 71 | /* All the entries below look up regval in an 8-entry array */ |
| 72 | if (regval < 0 || regval > 7) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 73 | return 0; |
H. Peter Anvin | 232badb | 2002-06-06 02:41:20 +0000 | [diff] [blame] | 74 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 75 | if (!((REGMEM | BITS8) & ~regflags)) |
| 76 | return reg8[regval]; |
| 77 | if (!((REGMEM | BITS16) & ~regflags)) |
| 78 | return reg16[regval]; |
| 79 | if (!((REGMEM | BITS32) & ~regflags)) |
| 80 | return reg32[regval]; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 81 | if (!(REG_SREG & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 82 | return sreg[regval]; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 83 | if (!(REG_CREG & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 84 | return creg[regval]; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 85 | if (!(REG_DREG & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 86 | return dreg[regval]; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 87 | if (!(REG_TREG & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 88 | return treg[regval]; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 89 | if (!(FPUREG & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 90 | return fpureg[regval]; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 91 | if (!(MMXREG & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 92 | return mmxreg[regval]; |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 93 | if (!(XMMREG & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 94 | return xmmreg[regval]; |
H. Peter Anvin | 232badb | 2002-06-06 02:41:20 +0000 | [diff] [blame] | 95 | |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 96 | return 0; |
| 97 | } |
| 98 | |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame^] | 99 | static const char *whichcond(int condval) |
H. Peter Anvin | eba20a7 | 2002-04-30 20:53:55 +0000 | [diff] [blame] | 100 | { |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 101 | static int conds[] = { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 102 | C_O, C_NO, C_C, C_NC, C_Z, C_NZ, C_NA, C_A, |
| 103 | C_S, C_NS, C_PE, C_PO, C_L, C_NL, C_NG, C_G |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 104 | }; |
| 105 | return conditions[conds[condval]]; |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * Process an effective address (ModRM) specification. |
| 110 | */ |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 111 | static uint8_t *do_ea(uint8_t *data, int modrm, int asize, |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 112 | int segsize, operand * op) |
H. Peter Anvin | eba20a7 | 2002-04-30 20:53:55 +0000 | [diff] [blame] | 113 | { |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 114 | int mod, rm, scale, index, base; |
| 115 | |
| 116 | mod = (modrm >> 6) & 03; |
| 117 | rm = modrm & 07; |
| 118 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 119 | if (mod == 3) { /* pure register version */ |
| 120 | op->basereg = rm; |
| 121 | op->segment |= SEG_RMREG; |
| 122 | return data; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 123 | } |
| 124 | |
| 125 | op->addr_size = 0; |
| 126 | |
| 127 | if (asize == 16) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 128 | /* |
| 129 | * <mod> specifies the displacement size (none, byte or |
| 130 | * word), and <rm> specifies the register combination. |
| 131 | * Exception: mod=0,rm=6 does not specify [BP] as one might |
| 132 | * expect, but instead specifies [disp16]. |
| 133 | */ |
| 134 | op->indexreg = op->basereg = -1; |
| 135 | op->scale = 1; /* always, in 16 bits */ |
| 136 | switch (rm) { |
| 137 | case 0: |
| 138 | op->basereg = R_BX; |
| 139 | op->indexreg = R_SI; |
| 140 | break; |
| 141 | case 1: |
| 142 | op->basereg = R_BX; |
| 143 | op->indexreg = R_DI; |
| 144 | break; |
| 145 | case 2: |
| 146 | op->basereg = R_BP; |
| 147 | op->indexreg = R_SI; |
| 148 | break; |
| 149 | case 3: |
| 150 | op->basereg = R_BP; |
| 151 | op->indexreg = R_DI; |
| 152 | break; |
| 153 | case 4: |
| 154 | op->basereg = R_SI; |
| 155 | break; |
| 156 | case 5: |
| 157 | op->basereg = R_DI; |
| 158 | break; |
| 159 | case 6: |
| 160 | op->basereg = R_BP; |
| 161 | break; |
| 162 | case 7: |
| 163 | op->basereg = R_BX; |
| 164 | break; |
| 165 | } |
| 166 | if (rm == 6 && mod == 0) { /* special case */ |
| 167 | op->basereg = -1; |
| 168 | if (segsize != 16) |
| 169 | op->addr_size = 16; |
| 170 | mod = 2; /* fake disp16 */ |
| 171 | } |
| 172 | switch (mod) { |
| 173 | case 0: |
| 174 | op->segment |= SEG_NODISP; |
| 175 | break; |
| 176 | case 1: |
| 177 | op->segment |= SEG_DISP8; |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame^] | 178 | op->offset = (char)*data++; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 179 | break; |
| 180 | case 2: |
| 181 | op->segment |= SEG_DISP16; |
| 182 | op->offset = *data++; |
| 183 | op->offset |= ((unsigned)*data++) << 8; |
| 184 | break; |
| 185 | } |
| 186 | return data; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 187 | } else { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 188 | /* |
| 189 | * Once again, <mod> specifies displacement size (this time |
| 190 | * none, byte or *dword*), while <rm> specifies the base |
| 191 | * register. Again, [EBP] is missing, replaced by a pure |
| 192 | * disp32 (this time that's mod=0,rm=*5*). However, rm=4 |
| 193 | * indicates not a single base register, but instead the |
| 194 | * presence of a SIB byte... |
| 195 | */ |
| 196 | op->indexreg = -1; |
| 197 | switch (rm) { |
| 198 | case 0: |
| 199 | op->basereg = R_EAX; |
| 200 | break; |
| 201 | case 1: |
| 202 | op->basereg = R_ECX; |
| 203 | break; |
| 204 | case 2: |
| 205 | op->basereg = R_EDX; |
| 206 | break; |
| 207 | case 3: |
| 208 | op->basereg = R_EBX; |
| 209 | break; |
| 210 | case 5: |
| 211 | op->basereg = R_EBP; |
| 212 | break; |
| 213 | case 6: |
| 214 | op->basereg = R_ESI; |
| 215 | break; |
| 216 | case 7: |
| 217 | op->basereg = R_EDI; |
| 218 | break; |
| 219 | } |
| 220 | if (rm == 5 && mod == 0) { |
| 221 | op->basereg = -1; |
| 222 | if (segsize != 32) |
| 223 | op->addr_size = 32; |
| 224 | mod = 2; /* fake disp32 */ |
| 225 | } |
| 226 | if (rm == 4) { /* process SIB */ |
| 227 | scale = (*data >> 6) & 03; |
| 228 | index = (*data >> 3) & 07; |
| 229 | base = *data & 07; |
| 230 | data++; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 231 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 232 | op->scale = 1 << scale; |
| 233 | switch (index) { |
| 234 | case 0: |
| 235 | op->indexreg = R_EAX; |
| 236 | break; |
| 237 | case 1: |
| 238 | op->indexreg = R_ECX; |
| 239 | break; |
| 240 | case 2: |
| 241 | op->indexreg = R_EDX; |
| 242 | break; |
| 243 | case 3: |
| 244 | op->indexreg = R_EBX; |
| 245 | break; |
| 246 | case 4: |
| 247 | op->indexreg = -1; |
| 248 | break; |
| 249 | case 5: |
| 250 | op->indexreg = R_EBP; |
| 251 | break; |
| 252 | case 6: |
| 253 | op->indexreg = R_ESI; |
| 254 | break; |
| 255 | case 7: |
| 256 | op->indexreg = R_EDI; |
| 257 | break; |
| 258 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 259 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 260 | switch (base) { |
| 261 | case 0: |
| 262 | op->basereg = R_EAX; |
| 263 | break; |
| 264 | case 1: |
| 265 | op->basereg = R_ECX; |
| 266 | break; |
| 267 | case 2: |
| 268 | op->basereg = R_EDX; |
| 269 | break; |
| 270 | case 3: |
| 271 | op->basereg = R_EBX; |
| 272 | break; |
| 273 | case 4: |
| 274 | op->basereg = R_ESP; |
| 275 | break; |
| 276 | case 6: |
| 277 | op->basereg = R_ESI; |
| 278 | break; |
| 279 | case 7: |
| 280 | op->basereg = R_EDI; |
| 281 | break; |
| 282 | case 5: |
| 283 | if (mod == 0) { |
| 284 | mod = 2; |
| 285 | op->basereg = -1; |
| 286 | } else |
| 287 | op->basereg = R_EBP; |
| 288 | break; |
| 289 | } |
| 290 | } |
| 291 | switch (mod) { |
| 292 | case 0: |
| 293 | op->segment |= SEG_NODISP; |
| 294 | break; |
| 295 | case 1: |
| 296 | op->segment |= SEG_DISP8; |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame^] | 297 | op->offset = (char)*data++; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 298 | break; |
| 299 | case 2: |
| 300 | op->segment |= SEG_DISP32; |
| 301 | op->offset = *data++; |
| 302 | op->offset |= ((unsigned)*data++) << 8; |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 303 | op->offset |= ((int32_t)*data++) << 16; |
| 304 | op->offset |= ((int32_t)*data++) << 24; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 305 | break; |
| 306 | } |
| 307 | return data; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 308 | } |
| 309 | } |
| 310 | |
| 311 | /* |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 312 | * Determine whether the instruction template in t corresponds to the data |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 313 | * stream in data. Return the number of bytes matched if so. |
| 314 | */ |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 315 | static int matches(struct itemplate *t, uint8_t *data, int asize, |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 316 | int osize, int segsize, int rep, insn * ins) |
H. Peter Anvin | eba20a7 | 2002-04-30 20:53:55 +0000 | [diff] [blame] | 317 | { |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 318 | uint8_t *r = (uint8_t *)(t->code); |
| 319 | uint8_t *origdata = data; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 320 | int a_used = FALSE, o_used = FALSE; |
| 321 | int drep = 0; |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 322 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 323 | if (rep == 0xF2) |
| 324 | drep = P_REPNE; |
| 325 | else if (rep == 0xF3) |
| 326 | drep = P_REP; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 327 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 328 | while (*r) { |
| 329 | int c = *r++; |
| 330 | if (c >= 01 && c <= 03) { |
| 331 | while (c--) |
| 332 | if (*r++ != *data++) |
| 333 | return FALSE; |
| 334 | } |
| 335 | if (c == 04) { |
| 336 | switch (*data++) { |
| 337 | case 0x07: |
| 338 | ins->oprs[0].basereg = 0; |
| 339 | break; |
| 340 | case 0x17: |
| 341 | ins->oprs[0].basereg = 2; |
| 342 | break; |
| 343 | case 0x1F: |
| 344 | ins->oprs[0].basereg = 3; |
| 345 | break; |
| 346 | default: |
| 347 | return FALSE; |
| 348 | } |
| 349 | } |
| 350 | if (c == 05) { |
| 351 | switch (*data++) { |
| 352 | case 0xA1: |
| 353 | ins->oprs[0].basereg = 4; |
| 354 | break; |
| 355 | case 0xA9: |
| 356 | ins->oprs[0].basereg = 5; |
| 357 | break; |
| 358 | default: |
| 359 | return FALSE; |
| 360 | } |
| 361 | } |
| 362 | if (c == 06) { |
| 363 | switch (*data++) { |
| 364 | case 0x06: |
| 365 | ins->oprs[0].basereg = 0; |
| 366 | break; |
| 367 | case 0x0E: |
| 368 | ins->oprs[0].basereg = 1; |
| 369 | break; |
| 370 | case 0x16: |
| 371 | ins->oprs[0].basereg = 2; |
| 372 | break; |
| 373 | case 0x1E: |
| 374 | ins->oprs[0].basereg = 3; |
| 375 | break; |
| 376 | default: |
| 377 | return FALSE; |
| 378 | } |
| 379 | } |
| 380 | if (c == 07) { |
| 381 | switch (*data++) { |
| 382 | case 0xA0: |
| 383 | ins->oprs[0].basereg = 4; |
| 384 | break; |
| 385 | case 0xA8: |
| 386 | ins->oprs[0].basereg = 5; |
| 387 | break; |
| 388 | default: |
| 389 | return FALSE; |
| 390 | } |
| 391 | } |
| 392 | if (c >= 010 && c <= 012) { |
| 393 | int t = *r++, d = *data++; |
| 394 | if (d < t || d > t + 7) |
| 395 | return FALSE; |
| 396 | else { |
| 397 | ins->oprs[c - 010].basereg = d - t; |
| 398 | ins->oprs[c - 010].segment |= SEG_RMREG; |
| 399 | } |
| 400 | } |
| 401 | if (c == 017) |
| 402 | if (*data++) |
| 403 | return FALSE; |
| 404 | if (c >= 014 && c <= 016) { |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame^] | 405 | ins->oprs[c - 014].offset = (char)*data++; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 406 | ins->oprs[c - 014].segment |= SEG_SIGNED; |
| 407 | } |
| 408 | if (c >= 020 && c <= 022) |
| 409 | ins->oprs[c - 020].offset = *data++; |
| 410 | if (c >= 024 && c <= 026) |
| 411 | ins->oprs[c - 024].offset = *data++; |
| 412 | if (c >= 030 && c <= 032) { |
| 413 | ins->oprs[c - 030].offset = *data++; |
| 414 | ins->oprs[c - 030].offset |= (((unsigned)*data++) << 8); |
| 415 | } |
| 416 | if (c >= 034 && c <= 036) { |
| 417 | ins->oprs[c - 034].offset = *data++; |
| 418 | ins->oprs[c - 034].offset |= (((unsigned)*data++) << 8); |
| 419 | if (osize == 32) { |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 420 | ins->oprs[c - 034].offset |= (((int32_t)*data++) << 16); |
| 421 | ins->oprs[c - 034].offset |= (((int32_t)*data++) << 24); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 422 | } |
| 423 | if (segsize != asize) |
| 424 | ins->oprs[c - 034].addr_size = asize; |
| 425 | } |
| 426 | if (c >= 040 && c <= 042) { |
| 427 | ins->oprs[c - 040].offset = *data++; |
| 428 | ins->oprs[c - 040].offset |= (((unsigned)*data++) << 8); |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 429 | ins->oprs[c - 040].offset |= (((int32_t)*data++) << 16); |
| 430 | ins->oprs[c - 040].offset |= (((int32_t)*data++) << 24); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 431 | } |
| 432 | if (c >= 044 && c <= 046) { |
| 433 | ins->oprs[c - 044].offset = *data++; |
| 434 | ins->oprs[c - 044].offset |= (((unsigned)*data++) << 8); |
| 435 | if (asize == 32) { |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 436 | ins->oprs[c - 044].offset |= (((int32_t)*data++) << 16); |
| 437 | ins->oprs[c - 044].offset |= (((int32_t)*data++) << 24); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 438 | } |
| 439 | if (segsize != asize) |
| 440 | ins->oprs[c - 044].addr_size = asize; |
| 441 | } |
| 442 | if (c >= 050 && c <= 052) { |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame^] | 443 | ins->oprs[c - 050].offset = (char)*data++; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 444 | ins->oprs[c - 050].segment |= SEG_RELATIVE; |
| 445 | } |
| 446 | if (c >= 060 && c <= 062) { |
| 447 | ins->oprs[c - 060].offset = *data++; |
| 448 | ins->oprs[c - 060].offset |= (((unsigned)*data++) << 8); |
| 449 | ins->oprs[c - 060].segment |= SEG_RELATIVE; |
| 450 | ins->oprs[c - 060].segment &= ~SEG_32BIT; |
| 451 | } |
| 452 | if (c >= 064 && c <= 066) { |
| 453 | ins->oprs[c - 064].offset = *data++; |
| 454 | ins->oprs[c - 064].offset |= (((unsigned)*data++) << 8); |
| 455 | if (osize == 32) { |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 456 | ins->oprs[c - 064].offset |= (((int32_t)*data++) << 16); |
| 457 | ins->oprs[c - 064].offset |= (((int32_t)*data++) << 24); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 458 | ins->oprs[c - 064].segment |= SEG_32BIT; |
| 459 | } else |
| 460 | ins->oprs[c - 064].segment &= ~SEG_32BIT; |
| 461 | ins->oprs[c - 064].segment |= SEG_RELATIVE; |
| 462 | if (segsize != osize) { |
| 463 | ins->oprs[c - 064].type = |
| 464 | (ins->oprs[c - 064].type & NON_SIZE) |
| 465 | | ((osize == 16) ? BITS16 : BITS32); |
| 466 | } |
| 467 | } |
| 468 | if (c >= 070 && c <= 072) { |
| 469 | ins->oprs[c - 070].offset = *data++; |
| 470 | ins->oprs[c - 070].offset |= (((unsigned)*data++) << 8); |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 471 | ins->oprs[c - 070].offset |= (((int32_t)*data++) << 16); |
| 472 | ins->oprs[c - 070].offset |= (((int32_t)*data++) << 24); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 473 | ins->oprs[c - 070].segment |= SEG_32BIT | SEG_RELATIVE; |
| 474 | } |
| 475 | if (c >= 0100 && c < 0130) { |
| 476 | int modrm = *data++; |
| 477 | ins->oprs[c & 07].basereg = (modrm >> 3) & 07; |
| 478 | ins->oprs[c & 07].segment |= SEG_RMREG; |
| 479 | data = do_ea(data, modrm, asize, segsize, |
| 480 | &ins->oprs[(c >> 3) & 07]); |
| 481 | } |
| 482 | if (c >= 0130 && c <= 0132) { |
| 483 | ins->oprs[c - 0130].offset = *data++; |
| 484 | ins->oprs[c - 0130].offset |= (((unsigned)*data++) << 8); |
| 485 | } |
| 486 | if (c >= 0140 && c <= 0142) { |
| 487 | ins->oprs[c - 0140].offset = *data++; |
| 488 | ins->oprs[c - 0140].offset |= (((unsigned)*data++) << 8); |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 489 | ins->oprs[c - 0140].offset |= (((int32_t)*data++) << 16); |
| 490 | ins->oprs[c - 0140].offset |= (((int32_t)*data++) << 24); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 491 | } |
| 492 | if (c >= 0200 && c <= 0277) { |
| 493 | int modrm = *data++; |
| 494 | if (((modrm >> 3) & 07) != (c & 07)) |
| 495 | return FALSE; /* spare field doesn't match up */ |
| 496 | data = do_ea(data, modrm, asize, segsize, |
| 497 | &ins->oprs[(c >> 3) & 07]); |
| 498 | } |
| 499 | if (c >= 0300 && c <= 0302) { |
| 500 | if (asize) |
| 501 | ins->oprs[c - 0300].segment |= SEG_32BIT; |
| 502 | else |
| 503 | ins->oprs[c - 0300].segment &= ~SEG_32BIT; |
| 504 | a_used = TRUE; |
| 505 | } |
| 506 | if (c == 0310) { |
| 507 | if (asize == 32) |
| 508 | return FALSE; |
| 509 | else |
| 510 | a_used = TRUE; |
| 511 | } |
| 512 | if (c == 0311) { |
| 513 | if (asize == 16) |
| 514 | return FALSE; |
| 515 | else |
| 516 | a_used = TRUE; |
| 517 | } |
| 518 | if (c == 0312) { |
| 519 | if (asize != segsize) |
| 520 | return FALSE; |
| 521 | else |
| 522 | a_used = TRUE; |
| 523 | } |
| 524 | if (c == 0320) { |
| 525 | if (osize == 32) |
| 526 | return FALSE; |
| 527 | else |
| 528 | o_used = TRUE; |
| 529 | } |
| 530 | if (c == 0321) { |
| 531 | if (osize == 16) |
| 532 | return FALSE; |
| 533 | else |
| 534 | o_used = TRUE; |
| 535 | } |
| 536 | if (c == 0322) { |
| 537 | if (osize != segsize) |
| 538 | return FALSE; |
| 539 | else |
| 540 | o_used = TRUE; |
| 541 | } |
| 542 | if (c == 0330) { |
| 543 | int t = *r++, d = *data++; |
| 544 | if (d < t || d > t + 15) |
| 545 | return FALSE; |
| 546 | else |
| 547 | ins->condition = d - t; |
| 548 | } |
| 549 | if (c == 0331) { |
| 550 | if (rep) |
| 551 | return FALSE; |
| 552 | } |
| 553 | if (c == 0332) { |
| 554 | if (drep == P_REP) |
| 555 | drep = P_REPE; |
| 556 | } |
| 557 | if (c == 0333) { |
| 558 | if (rep != 0xF3) |
| 559 | return FALSE; |
| 560 | drep = 0; |
| 561 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 562 | } |
| 563 | |
| 564 | /* |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 565 | * Check for unused rep or a/o prefixes. |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 566 | */ |
| 567 | ins->nprefix = 0; |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 568 | if (drep) |
| 569 | ins->prefixes[ins->nprefix++] = drep; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 570 | if (!a_used && asize != segsize) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 571 | ins->prefixes[ins->nprefix++] = (asize == 16 ? P_A16 : P_A32); |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 572 | if (!o_used && osize != segsize) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 573 | ins->prefixes[ins->nprefix++] = (osize == 16 ? P_O16 : P_O32); |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 574 | |
| 575 | return data - origdata; |
| 576 | } |
| 577 | |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame^] | 578 | int32_t disasm(uint8_t *data, char *output, int outbufsize, int segsize, |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 579 | int32_t offset, int autosync, uint32_t prefer) |
H. Peter Anvin | eba20a7 | 2002-04-30 20:53:55 +0000 | [diff] [blame] | 580 | { |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 581 | struct itemplate **p, **best_p; |
| 582 | int length, best_length = 0; |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame^] | 583 | char *segover; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 584 | int rep, lock, asize, osize, i, slen, colon; |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 585 | uint8_t *origdata; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 586 | int works; |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 587 | insn tmp_ins, ins; |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 588 | uint32_t goodness, best; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 589 | |
| 590 | /* |
| 591 | * Scan for prefixes. |
| 592 | */ |
| 593 | asize = osize = segsize; |
| 594 | segover = NULL; |
| 595 | rep = lock = 0; |
| 596 | origdata = data; |
| 597 | for (;;) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 598 | if (*data == 0xF3 || *data == 0xF2) |
| 599 | rep = *data++; |
| 600 | else if (*data == 0xF0) |
| 601 | lock = *data++; |
| 602 | else if (*data == 0x2E || *data == 0x36 || *data == 0x3E || |
| 603 | *data == 0x26 || *data == 0x64 || *data == 0x65) { |
| 604 | switch (*data++) { |
| 605 | case 0x2E: |
| 606 | segover = "cs"; |
| 607 | break; |
| 608 | case 0x36: |
| 609 | segover = "ss"; |
| 610 | break; |
| 611 | case 0x3E: |
| 612 | segover = "ds"; |
| 613 | break; |
| 614 | case 0x26: |
| 615 | segover = "es"; |
| 616 | break; |
| 617 | case 0x64: |
| 618 | segover = "fs"; |
| 619 | break; |
| 620 | case 0x65: |
| 621 | segover = "gs"; |
| 622 | break; |
| 623 | } |
| 624 | } else if (*data == 0x66) |
| 625 | osize = 48 - segsize, data++; |
| 626 | else if (*data == 0x67) |
| 627 | asize = 48 - segsize, data++; |
| 628 | else |
| 629 | break; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 630 | } |
| 631 | |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 632 | tmp_ins.oprs[0].segment = tmp_ins.oprs[1].segment = |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 633 | tmp_ins.oprs[2].segment = |
| 634 | tmp_ins.oprs[0].addr_size = tmp_ins.oprs[1].addr_size = |
| 635 | tmp_ins.oprs[2].addr_size = (segsize == 16 ? 0 : SEG_32BIT); |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 636 | tmp_ins.condition = -1; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 637 | best = ~0UL; /* Worst possible */ |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 638 | best_p = NULL; |
| 639 | for (p = itable[*data]; *p; p++) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 640 | if ((length = matches(*p, data, asize, osize, |
| 641 | segsize, rep, &tmp_ins))) { |
| 642 | works = TRUE; |
| 643 | /* |
| 644 | * Final check to make sure the types of r/m match up. |
| 645 | */ |
| 646 | for (i = 0; i < (*p)->operands; i++) { |
| 647 | if ( |
| 648 | /* If it's a mem-only EA but we have a register, die. */ |
| 649 | ((tmp_ins.oprs[i].segment & SEG_RMREG) && |
| 650 | !(MEMORY & ~(*p)->opd[i])) || |
| 651 | /* If it's a reg-only EA but we have a memory ref, die. */ |
| 652 | (!(tmp_ins.oprs[i].segment & SEG_RMREG) && |
| 653 | !(REGNORM & ~(*p)->opd[i]) && |
| 654 | !((*p)->opd[i] & REG_SMASK)) || |
| 655 | /* Register type mismatch (eg FS vs REG_DESS): die. */ |
| 656 | ((((*p)->opd[i] & (REGISTER | FPUREG)) || |
| 657 | (tmp_ins.oprs[i].segment & SEG_RMREG)) && |
| 658 | !whichreg((*p)->opd[i], |
| 659 | tmp_ins.oprs[i].basereg))) { |
| 660 | works = FALSE; |
| 661 | break; |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | if (works) { |
| 666 | goodness = ((*p)->flags & IF_PFMASK) ^ prefer; |
| 667 | if (goodness < best) { |
| 668 | /* This is the best one found so far */ |
| 669 | best = goodness; |
| 670 | best_p = p; |
| 671 | best_length = length; |
| 672 | ins = tmp_ins; |
| 673 | } |
| 674 | } |
| 675 | } |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 676 | } |
H. Peter Anvin | eba20a7 | 2002-04-30 20:53:55 +0000 | [diff] [blame] | 677 | |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 678 | if (!best_p) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 679 | return 0; /* no instruction was matched */ |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 680 | |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 681 | /* Pick the best match */ |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 682 | p = best_p; |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 683 | length = best_length; |
| 684 | |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 685 | slen = 0; |
| 686 | |
Ed Beroset | 64ab519 | 2004-12-15 23:32:57 +0000 | [diff] [blame] | 687 | /* TODO: snprintf returns the value that the string would have if |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 688 | * the buffer were long enough, and not the actual length of |
| 689 | * the returned string, so each instance of using the return |
| 690 | * value of snprintf should actually be checked to assure that |
| 691 | * the return value is "sane." Maybe a macro wrapper could |
| 692 | * be used for that purpose. |
| 693 | */ |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 694 | if (lock) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 695 | slen += snprintf(output + slen, outbufsize - slen, "lock "); |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 696 | for (i = 0; i < ins.nprefix; i++) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 697 | switch (ins.prefixes[i]) { |
| 698 | case P_REP: |
| 699 | slen += snprintf(output + slen, outbufsize - slen, "rep "); |
| 700 | break; |
| 701 | case P_REPE: |
| 702 | slen += snprintf(output + slen, outbufsize - slen, "repe "); |
| 703 | break; |
| 704 | case P_REPNE: |
| 705 | slen += snprintf(output + slen, outbufsize - slen, "repne "); |
| 706 | break; |
| 707 | case P_A16: |
| 708 | slen += snprintf(output + slen, outbufsize - slen, "a16 "); |
| 709 | break; |
| 710 | case P_A32: |
| 711 | slen += snprintf(output + slen, outbufsize - slen, "a32 "); |
| 712 | break; |
| 713 | case P_O16: |
| 714 | slen += snprintf(output + slen, outbufsize - slen, "o16 "); |
| 715 | break; |
| 716 | case P_O32: |
| 717 | slen += snprintf(output + slen, outbufsize - slen, "o32 "); |
| 718 | break; |
| 719 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 720 | |
| 721 | for (i = 0; i < elements(ico); i++) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 722 | if ((*p)->opcode == ico[i]) { |
| 723 | slen += |
| 724 | snprintf(output + slen, outbufsize - slen, "%s%s", icn[i], |
| 725 | whichcond(ins.condition)); |
| 726 | break; |
| 727 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 728 | if (i >= elements(ico)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 729 | slen += |
| 730 | snprintf(output + slen, outbufsize - slen, "%s", |
| 731 | insn_names[(*p)->opcode]); |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 732 | colon = FALSE; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 733 | length += data - origdata; /* fix up for prefixes */ |
| 734 | for (i = 0; i < (*p)->operands; i++) { |
| 735 | output[slen++] = (colon ? ':' : i == 0 ? ' ' : ','); |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 736 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 737 | if (ins.oprs[i].segment & SEG_RELATIVE) { |
| 738 | ins.oprs[i].offset += offset + length; |
| 739 | /* |
| 740 | * sort out wraparound |
| 741 | */ |
| 742 | if (!(ins.oprs[i].segment & SEG_32BIT)) |
| 743 | ins.oprs[i].offset &= 0xFFFF; |
| 744 | /* |
| 745 | * add sync marker, if autosync is on |
| 746 | */ |
| 747 | if (autosync) |
| 748 | add_sync(ins.oprs[i].offset, 0L); |
| 749 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 750 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 751 | if ((*p)->opd[i] & COLON) |
| 752 | colon = TRUE; |
| 753 | else |
| 754 | colon = FALSE; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 755 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 756 | if (((*p)->opd[i] & (REGISTER | FPUREG)) || |
| 757 | (ins.oprs[i].segment & SEG_RMREG)) { |
| 758 | ins.oprs[i].basereg = whichreg((*p)->opd[i], |
| 759 | ins.oprs[i].basereg); |
| 760 | if ((*p)->opd[i] & TO) |
| 761 | slen += snprintf(output + slen, outbufsize - slen, "to "); |
| 762 | slen += snprintf(output + slen, outbufsize - slen, "%s", |
| 763 | reg_names[ins.oprs[i].basereg - |
| 764 | EXPR_REG_START]); |
| 765 | } else if (!(UNITY & ~(*p)->opd[i])) { |
| 766 | output[slen++] = '1'; |
| 767 | } else if ((*p)->opd[i] & IMMEDIATE) { |
| 768 | if ((*p)->opd[i] & BITS8) { |
| 769 | slen += |
| 770 | snprintf(output + slen, outbufsize - slen, "byte "); |
| 771 | if (ins.oprs[i].segment & SEG_SIGNED) { |
| 772 | if (ins.oprs[i].offset < 0) { |
| 773 | ins.oprs[i].offset *= -1; |
| 774 | output[slen++] = '-'; |
| 775 | } else |
| 776 | output[slen++] = '+'; |
| 777 | } |
| 778 | } else if ((*p)->opd[i] & BITS16) { |
| 779 | slen += |
| 780 | snprintf(output + slen, outbufsize - slen, "word "); |
| 781 | } else if ((*p)->opd[i] & BITS32) { |
| 782 | slen += |
| 783 | snprintf(output + slen, outbufsize - slen, "dword "); |
| 784 | } else if ((*p)->opd[i] & NEAR) { |
| 785 | slen += |
| 786 | snprintf(output + slen, outbufsize - slen, "near "); |
| 787 | } else if ((*p)->opd[i] & SHORT) { |
| 788 | slen += |
| 789 | snprintf(output + slen, outbufsize - slen, "short "); |
| 790 | } |
| 791 | slen += |
| 792 | snprintf(output + slen, outbufsize - slen, "0x%lx", |
| 793 | ins.oprs[i].offset); |
| 794 | } else if (!(MEM_OFFS & ~(*p)->opd[i])) { |
| 795 | slen += |
| 796 | snprintf(output + slen, outbufsize - slen, "[%s%s%s0x%lx]", |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 797 | ((const char*)segover ? (const char*)segover : ""), /* placate type mistmatch warning */ |
| 798 | ((const char*)segover ? ":" : ""), /* by using (const char*) instead of uint8_t* */ |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 799 | (ins.oprs[i].addr_size == |
| 800 | 32 ? "dword " : ins.oprs[i].addr_size == |
| 801 | 16 ? "word " : ""), ins.oprs[i].offset); |
| 802 | segover = NULL; |
| 803 | } else if (!(REGMEM & ~(*p)->opd[i])) { |
| 804 | int started = FALSE; |
| 805 | if ((*p)->opd[i] & BITS8) |
| 806 | slen += |
| 807 | snprintf(output + slen, outbufsize - slen, "byte "); |
| 808 | if ((*p)->opd[i] & BITS16) |
| 809 | slen += |
| 810 | snprintf(output + slen, outbufsize - slen, "word "); |
| 811 | if ((*p)->opd[i] & BITS32) |
| 812 | slen += |
| 813 | snprintf(output + slen, outbufsize - slen, "dword "); |
| 814 | if ((*p)->opd[i] & BITS64) |
| 815 | slen += |
| 816 | snprintf(output + slen, outbufsize - slen, "qword "); |
| 817 | if ((*p)->opd[i] & BITS80) |
| 818 | slen += |
| 819 | snprintf(output + slen, outbufsize - slen, "tword "); |
| 820 | if ((*p)->opd[i] & FAR) |
| 821 | slen += snprintf(output + slen, outbufsize - slen, "far "); |
| 822 | if ((*p)->opd[i] & NEAR) |
| 823 | slen += |
| 824 | snprintf(output + slen, outbufsize - slen, "near "); |
| 825 | output[slen++] = '['; |
| 826 | if (ins.oprs[i].addr_size) |
| 827 | slen += snprintf(output + slen, outbufsize - slen, "%s", |
| 828 | (ins.oprs[i].addr_size == 32 ? "dword " : |
| 829 | ins.oprs[i].addr_size == |
| 830 | 16 ? "word " : "")); |
| 831 | if (segover) { |
| 832 | slen += |
| 833 | snprintf(output + slen, outbufsize - slen, "%s:", |
| 834 | segover); |
| 835 | segover = NULL; |
| 836 | } |
| 837 | if (ins.oprs[i].basereg != -1) { |
| 838 | slen += snprintf(output + slen, outbufsize - slen, "%s", |
| 839 | reg_names[(ins.oprs[i].basereg - |
| 840 | EXPR_REG_START)]); |
| 841 | started = TRUE; |
| 842 | } |
| 843 | if (ins.oprs[i].indexreg != -1) { |
| 844 | if (started) |
| 845 | output[slen++] = '+'; |
| 846 | slen += snprintf(output + slen, outbufsize - slen, "%s", |
| 847 | reg_names[(ins.oprs[i].indexreg - |
| 848 | EXPR_REG_START)]); |
| 849 | if (ins.oprs[i].scale > 1) |
| 850 | slen += |
| 851 | snprintf(output + slen, outbufsize - slen, "*%d", |
| 852 | ins.oprs[i].scale); |
| 853 | started = TRUE; |
| 854 | } |
| 855 | if (ins.oprs[i].segment & SEG_DISP8) { |
| 856 | int sign = '+'; |
| 857 | if (ins.oprs[i].offset & 0x80) { |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame^] | 858 | ins.oprs[i].offset = -(char)ins.oprs[i].offset; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 859 | sign = '-'; |
| 860 | } |
| 861 | slen += |
| 862 | snprintf(output + slen, outbufsize - slen, "%c0x%lx", |
| 863 | sign, ins.oprs[i].offset); |
| 864 | } else if (ins.oprs[i].segment & SEG_DISP16) { |
| 865 | if (started) |
| 866 | output[slen++] = '+'; |
| 867 | slen += |
| 868 | snprintf(output + slen, outbufsize - slen, "0x%lx", |
| 869 | ins.oprs[i].offset); |
| 870 | } else if (ins.oprs[i].segment & SEG_DISP32) { |
| 871 | if (started) |
| 872 | output[slen++] = '+'; |
| 873 | slen += |
| 874 | snprintf(output + slen, outbufsize - slen, "0x%lx", |
| 875 | ins.oprs[i].offset); |
| 876 | } |
| 877 | output[slen++] = ']'; |
| 878 | } else { |
| 879 | slen += |
| 880 | snprintf(output + slen, outbufsize - slen, "<operand%d>", |
| 881 | i); |
| 882 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 883 | } |
| 884 | output[slen] = '\0'; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 885 | if (segover) { /* unused segment override */ |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame^] | 886 | char *p = output; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 887 | int count = slen + 1; |
| 888 | while (count--) |
| 889 | p[count + 3] = p[count]; |
| 890 | strncpy(output, segover, 2); |
| 891 | output[2] = ' '; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 892 | } |
| 893 | return length; |
| 894 | } |
| 895 | |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame^] | 896 | int32_t eatbyte(uint8_t *data, char *output, int outbufsize) |
H. Peter Anvin | eba20a7 | 2002-04-30 20:53:55 +0000 | [diff] [blame] | 897 | { |
Ed Beroset | 9234817 | 2004-12-15 18:27:50 +0000 | [diff] [blame] | 898 | snprintf(output, outbufsize, "db 0x%02X", *data); |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 899 | return 1; |
| 900 | } |