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 | */ |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 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 | #define SEG_64BIT 256 |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 37 | |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 38 | /* |
| 39 | * REX flags |
| 40 | */ |
| 41 | #define REX_P 0x40 /* REX prefix present */ |
| 42 | #define REX_W 0x08 /* 64-bit operand size */ |
| 43 | #define REX_R 0x04 /* ModRM reg extension */ |
| 44 | #define REX_X 0x02 /* SIB index extension */ |
| 45 | #define REX_B 0x01 /* ModRM r/m extension */ |
| 46 | |
H. Peter Anvin | 232badb | 2002-06-06 02:41:20 +0000 | [diff] [blame] | 47 | #include "regdis.c" |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 48 | |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 49 | #define getu8(x) (*(uint8_t *)(x)) |
| 50 | #if defined(__i386__) || defined(__x86_64__) |
| 51 | /* Littleendian CPU which can handle unaligned references */ |
| 52 | #define getu16(x) (*(uint16_t *)(x)) |
| 53 | #define getu32(x) (*(uint32_t *)(x)) |
| 54 | #define getu64(x) (*(uint64_t *)(x)) |
| 55 | #else |
| 56 | static uint16_t getu16(uint8_t *data) |
| 57 | { |
| 58 | return (uint16_t)data[0] + ((uint16_t)data[1] << 8); |
| 59 | } |
| 60 | static uint32_t getu32(uint8_t *data) |
| 61 | { |
| 62 | return (uint32_t)getu16(data) + ((uint32_t)getu16(data+2) << 16); |
| 63 | } |
| 64 | static uint64_t getu64(uint8_t *data) |
| 65 | { |
| 66 | return (uint64_t)getu32(data) + ((uint64_t)getu32(data+4) << 32); |
| 67 | } |
| 68 | #endif |
| 69 | |
| 70 | #define gets8(x) ((int8_t)getu8(x)) |
| 71 | #define gets16(x) ((int16_t)getu16(x)) |
| 72 | #define gets32(x) ((int32_t)getu32(x)) |
| 73 | #define gets64(x) ((int64_t)getu64(x)) |
| 74 | |
| 75 | /* Important: regval must already have been adjusted for rex extensions */ |
| 76 | static int whichreg(int32_t regflags, int regval, int rex) |
| 77 | { |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 78 | if (!(REG_AL & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 79 | return R_AL; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 80 | if (!(REG_AX & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 81 | return R_AX; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 82 | if (!(REG_EAX & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 83 | return R_EAX; |
H. Peter Anvin | 10101f2 | 2003-02-24 23:22:45 +0000 | [diff] [blame] | 84 | if (!(REG_DL & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 85 | return R_DL; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 86 | if (!(REG_DX & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 87 | return R_DX; |
H. Peter Anvin | 10101f2 | 2003-02-24 23:22:45 +0000 | [diff] [blame] | 88 | if (!(REG_EDX & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 89 | return R_EDX; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 90 | if (!(REG_CL & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 91 | return R_CL; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 92 | if (!(REG_CX & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 93 | return R_CX; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 94 | if (!(REG_ECX & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 95 | return R_ECX; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 96 | if (!(FPU0 & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 97 | return R_ST0; |
H. Peter Anvin | d7ed89e | 2002-04-30 20:52:08 +0000 | [diff] [blame] | 98 | if (!(REG_CS & ~regflags)) |
H. Peter Anvin | 232badb | 2002-06-06 02:41:20 +0000 | [diff] [blame] | 99 | return (regval == 1) ? R_CS : 0; |
H. Peter Anvin | 76690a1 | 2002-04-30 20:52:49 +0000 | [diff] [blame] | 100 | if (!(REG_DESS & ~regflags)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 101 | return (regval == 0 || regval == 2 |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 102 | || regval == 3 ? rd_sreg[regval] : 0); |
H. Peter Anvin | 76690a1 | 2002-04-30 20:52:49 +0000 | [diff] [blame] | 103 | if (!(REG_FSGS & ~regflags)) |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 104 | return (regval == 4 || regval == 5 ? rd_sreg[regval] : 0); |
H. Peter Anvin | 232badb | 2002-06-06 02:41:20 +0000 | [diff] [blame] | 105 | if (!(REG_SEG67 & ~regflags)) |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 106 | return (regval == 6 || regval == 7 ? rd_sreg[regval] : 0); |
H. Peter Anvin | 232badb | 2002-06-06 02:41:20 +0000 | [diff] [blame] | 107 | |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 108 | /* All the entries below look up regval in an 16-entry array */ |
| 109 | if (regval < 0 || regval > 15) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 110 | return 0; |
H. Peter Anvin | 232badb | 2002-06-06 02:41:20 +0000 | [diff] [blame] | 111 | |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 112 | if (!(rex & REX_P) && regval > 7) |
| 113 | return 0; /* Internal error! */ |
| 114 | |
| 115 | if (!((REGMEM | BITS8) & ~regflags)) { |
| 116 | if (rex & REX_P) |
| 117 | return rd_reg8_rex[regval]; |
| 118 | else |
| 119 | return rd_reg8[regval]; |
| 120 | } |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 121 | if (!((REGMEM | BITS16) & ~regflags)) |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 122 | return rd_reg16[regval]; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 123 | if (!((REGMEM | BITS32) & ~regflags)) |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 124 | return rd_reg32[regval]; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 125 | if (!((REGMEM | BITS64) & ~regflags)) |
| 126 | return rd_reg64[regval]; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 127 | if (!(REG_SREG & ~regflags)) |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 128 | return rd_sreg[regval & 7]; /* Ignore REX */ |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 129 | if (!(REG_CREG & ~regflags)) |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 130 | return rd_creg[regval]; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 131 | if (!(REG_DREG & ~regflags)) |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 132 | return rd_dreg[regval]; |
| 133 | if (!(REG_TREG & ~regflags)) { |
| 134 | if (rex & REX_P) |
| 135 | return 0; /* TR registers are ill-defined with rex */ |
| 136 | return rd_treg[regval]; |
| 137 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 138 | if (!(FPUREG & ~regflags)) |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 139 | return rd_fpureg[regval & 7]; /* Ignore REX */ |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 140 | if (!(MMXREG & ~regflags)) |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 141 | return rd_mmxreg[regval & 7]; /* Ignore REX */ |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 142 | if (!(XMMREG & ~regflags)) |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 143 | return rd_xmmreg[regval]; |
H. Peter Anvin | 232badb | 2002-06-06 02:41:20 +0000 | [diff] [blame] | 144 | |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 145 | return 0; |
| 146 | } |
| 147 | |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame] | 148 | static const char *whichcond(int condval) |
H. Peter Anvin | eba20a7 | 2002-04-30 20:53:55 +0000 | [diff] [blame] | 149 | { |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 150 | static int conds[] = { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 151 | C_O, C_NO, C_C, C_NC, C_Z, C_NZ, C_NA, C_A, |
| 152 | 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] | 153 | }; |
| 154 | return conditions[conds[condval]]; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * Process an effective address (ModRM) specification. |
| 159 | */ |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 160 | static uint8_t *do_ea(uint8_t *data, int modrm, int asize, |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 161 | int segsize, operand * op, int rex) |
H. Peter Anvin | eba20a7 | 2002-04-30 20:53:55 +0000 | [diff] [blame] | 162 | { |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 163 | int mod, rm, scale, index, base; |
| 164 | |
| 165 | mod = (modrm >> 6) & 03; |
| 166 | rm = modrm & 07; |
| 167 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 168 | if (mod == 3) { /* pure register version */ |
| 169 | op->basereg = rm; |
| 170 | op->segment |= SEG_RMREG; |
| 171 | return data; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | op->addr_size = 0; |
| 175 | |
| 176 | if (asize == 16) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 177 | /* |
| 178 | * <mod> specifies the displacement size (none, byte or |
| 179 | * word), and <rm> specifies the register combination. |
| 180 | * Exception: mod=0,rm=6 does not specify [BP] as one might |
| 181 | * expect, but instead specifies [disp16]. |
| 182 | */ |
| 183 | op->indexreg = op->basereg = -1; |
| 184 | op->scale = 1; /* always, in 16 bits */ |
| 185 | switch (rm) { |
| 186 | case 0: |
| 187 | op->basereg = R_BX; |
| 188 | op->indexreg = R_SI; |
| 189 | break; |
| 190 | case 1: |
| 191 | op->basereg = R_BX; |
| 192 | op->indexreg = R_DI; |
| 193 | break; |
| 194 | case 2: |
| 195 | op->basereg = R_BP; |
| 196 | op->indexreg = R_SI; |
| 197 | break; |
| 198 | case 3: |
| 199 | op->basereg = R_BP; |
| 200 | op->indexreg = R_DI; |
| 201 | break; |
| 202 | case 4: |
| 203 | op->basereg = R_SI; |
| 204 | break; |
| 205 | case 5: |
| 206 | op->basereg = R_DI; |
| 207 | break; |
| 208 | case 6: |
| 209 | op->basereg = R_BP; |
| 210 | break; |
| 211 | case 7: |
| 212 | op->basereg = R_BX; |
| 213 | break; |
| 214 | } |
| 215 | if (rm == 6 && mod == 0) { /* special case */ |
| 216 | op->basereg = -1; |
| 217 | if (segsize != 16) |
| 218 | op->addr_size = 16; |
| 219 | mod = 2; /* fake disp16 */ |
| 220 | } |
| 221 | switch (mod) { |
| 222 | case 0: |
| 223 | op->segment |= SEG_NODISP; |
| 224 | break; |
| 225 | case 1: |
| 226 | op->segment |= SEG_DISP8; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 227 | op->offset = (int8_t)*data++; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 228 | break; |
| 229 | case 2: |
| 230 | op->segment |= SEG_DISP16; |
| 231 | op->offset = *data++; |
| 232 | op->offset |= ((unsigned)*data++) << 8; |
| 233 | break; |
| 234 | } |
| 235 | return data; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 236 | } else { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 237 | /* |
| 238 | * Once again, <mod> specifies displacement size (this time |
| 239 | * none, byte or *dword*), while <rm> specifies the base |
| 240 | * register. Again, [EBP] is missing, replaced by a pure |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 241 | * disp32 (this time that's mod=0,rm=*5*) in 32-bit mode, |
| 242 | * and RIP-relative addressing in 64-bit mode. |
| 243 | * |
| 244 | * However, rm=4 |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 245 | * indicates not a single base register, but instead the |
| 246 | * presence of a SIB byte... |
| 247 | */ |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 248 | int a64 = asize == 64; |
| 249 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 250 | op->indexreg = -1; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 251 | |
| 252 | if (a64) |
| 253 | op->basereg = rd_reg64[rm | ((rex & REX_B) ? 8 : 0)]; |
| 254 | else |
| 255 | op->basereg = rd_reg32[rm | ((rex & REX_B) ? 8 : 0)]; |
| 256 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 257 | if (rm == 5 && mod == 0) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 258 | if (segsize == 64) { |
| 259 | op->basereg = R_RIP; |
| 260 | op->segment |= SEG_RELATIVE; |
| 261 | mod = 2; /* fake disp32 */ |
| 262 | } else { |
| 263 | op->basereg = -1; |
| 264 | if (segsize != 32) |
| 265 | op->addr_size = 32; |
| 266 | mod = 2; /* fake disp32 */ |
| 267 | } |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 268 | } |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 269 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 270 | if (rm == 4) { /* process SIB */ |
| 271 | scale = (*data >> 6) & 03; |
| 272 | index = (*data >> 3) & 07; |
| 273 | base = *data & 07; |
| 274 | data++; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 275 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 276 | op->scale = 1 << scale; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 277 | |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 278 | if (index == 4) |
| 279 | op->indexreg = -1; /* ESP/RSP/R12 cannot be an index */ |
| 280 | else if (a64) |
| 281 | op->indexreg = rd_reg64[index | ((rex & REX_X) ? 8 : 0)]; |
| 282 | else |
| 283 | op->indexreg = rd_reg64[index | ((rex & REX_X) ? 8 : 0)]; |
| 284 | |
| 285 | if (base == 5 && mod == 0) { |
| 286 | op->basereg = -1; |
| 287 | mod = 2; /* Fake disp32 */ |
| 288 | } else if (a64) |
| 289 | op->basereg = rd_reg64[base | ((rex & REX_B) ? 8 : 0)]; |
| 290 | else |
| 291 | op->basereg = rd_reg32[base | ((rex & REX_B) ? 8 : 0)]; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 292 | } |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 293 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 294 | switch (mod) { |
| 295 | case 0: |
| 296 | op->segment |= SEG_NODISP; |
| 297 | break; |
| 298 | case 1: |
| 299 | op->segment |= SEG_DISP8; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 300 | op->offset = gets8(data); |
| 301 | data++; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 302 | break; |
| 303 | case 2: |
| 304 | op->segment |= SEG_DISP32; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 305 | op->offset = getu32(data); |
| 306 | data += 4; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 307 | break; |
| 308 | } |
| 309 | return data; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 310 | } |
| 311 | } |
| 312 | |
| 313 | /* |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 314 | * Determine whether the instruction template in t corresponds to the data |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 315 | * stream in data. Return the number of bytes matched if so. |
| 316 | */ |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 317 | static int matches(struct itemplate *t, uint8_t *data, int asize, |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 318 | int osize, int segsize, int rep, insn * ins, |
| 319 | int rex, int *rexout) |
H. Peter Anvin | eba20a7 | 2002-04-30 20:53:55 +0000 | [diff] [blame] | 320 | { |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 321 | uint8_t *r = (uint8_t *)(t->code); |
| 322 | uint8_t *origdata = data; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 323 | int a_used = FALSE, o_used = FALSE; |
| 324 | int drep = 0; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 325 | |
| 326 | *rexout = rex; |
| 327 | |
| 328 | if (segsize == 64) { |
| 329 | if (t->flags & IF_NOLONG) |
| 330 | return FALSE; |
| 331 | } else { |
| 332 | if (t->flags & IF_X64) |
| 333 | return FALSE; |
| 334 | } |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 335 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 336 | if (rep == 0xF2) |
| 337 | drep = P_REPNE; |
| 338 | else if (rep == 0xF3) |
| 339 | drep = P_REP; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 340 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 341 | while (*r) { |
| 342 | int c = *r++; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 343 | |
| 344 | /* FIX: change this into a switch */ |
| 345 | if (c >= 01 && c <= 03) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 346 | while (c--) |
| 347 | if (*r++ != *data++) |
| 348 | return FALSE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 349 | } else if (c == 04) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 350 | switch (*data++) { |
| 351 | case 0x07: |
| 352 | ins->oprs[0].basereg = 0; |
| 353 | break; |
| 354 | case 0x17: |
| 355 | ins->oprs[0].basereg = 2; |
| 356 | break; |
| 357 | case 0x1F: |
| 358 | ins->oprs[0].basereg = 3; |
| 359 | break; |
| 360 | default: |
| 361 | return FALSE; |
| 362 | } |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 363 | } else if (c == 05) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 364 | switch (*data++) { |
| 365 | case 0xA1: |
| 366 | ins->oprs[0].basereg = 4; |
| 367 | break; |
| 368 | case 0xA9: |
| 369 | ins->oprs[0].basereg = 5; |
| 370 | break; |
| 371 | default: |
| 372 | return FALSE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 373 | } |
| 374 | } else if (c == 06) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 375 | switch (*data++) { |
| 376 | case 0x06: |
| 377 | ins->oprs[0].basereg = 0; |
| 378 | break; |
| 379 | case 0x0E: |
| 380 | ins->oprs[0].basereg = 1; |
| 381 | break; |
| 382 | case 0x16: |
| 383 | ins->oprs[0].basereg = 2; |
| 384 | break; |
| 385 | case 0x1E: |
| 386 | ins->oprs[0].basereg = 3; |
| 387 | break; |
| 388 | default: |
| 389 | return FALSE; |
| 390 | } |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 391 | } else if (c == 07) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 392 | switch (*data++) { |
| 393 | case 0xA0: |
| 394 | ins->oprs[0].basereg = 4; |
| 395 | break; |
| 396 | case 0xA8: |
| 397 | ins->oprs[0].basereg = 5; |
| 398 | break; |
| 399 | default: |
| 400 | return FALSE; |
| 401 | } |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 402 | } else if (c >= 010 && c <= 012) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 403 | int t = *r++, d = *data++; |
| 404 | if (d < t || d > t + 7) |
| 405 | return FALSE; |
| 406 | else { |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 407 | ins->oprs[c - 010].basereg = (d-t)+(rex & REX_B ? 8 : 0); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 408 | ins->oprs[c - 010].segment |= SEG_RMREG; |
| 409 | } |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 410 | } else if (c == 017) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 411 | if (*data++) |
| 412 | return FALSE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 413 | } else if (c >= 014 && c <= 016) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 414 | ins->oprs[c - 014].offset = (int8_t)*data++; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 415 | ins->oprs[c - 014].segment |= SEG_SIGNED; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 416 | } else if (c >= 020 && c <= 022) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 417 | ins->oprs[c - 020].offset = *data++; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 418 | } else if (c >= 024 && c <= 026) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 419 | ins->oprs[c - 024].offset = *data++; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 420 | } else if (c >= 030 && c <= 032) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 421 | ins->oprs[c - 030].offset = getu16(data); |
| 422 | data += 2; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 423 | } else if (c >= 034 && c <= 036) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 424 | if (osize == 32) { |
| 425 | ins->oprs[c - 034].offset = getu32(data); |
| 426 | data += 4; |
| 427 | } else { |
| 428 | ins->oprs[c - 034].offset = getu16(data); |
| 429 | data += 2; |
| 430 | } |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 431 | if (segsize != asize) |
| 432 | ins->oprs[c - 034].addr_size = asize; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 433 | } else if (c >= 040 && c <= 042) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 434 | ins->oprs[c - 040].offset = getu32(data); |
| 435 | data += 4; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 436 | } else if (c >= 044 && c <= 046) { |
| 437 | switch (asize) { |
| 438 | case 16: |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 439 | ins->oprs[c - 044].offset = getu16(data); |
| 440 | data += 2; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 441 | break; |
| 442 | case 32: |
| 443 | ins->oprs[c - 044].offset = getu32(data); |
| 444 | data += 4; |
| 445 | break; |
| 446 | case 64: |
| 447 | ins->oprs[c - 044].offset = getu64(data); |
| 448 | data += 8; |
| 449 | break; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 450 | } |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 451 | if (segsize != asize) |
| 452 | ins->oprs[c - 044].addr_size = asize; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 453 | } else if (c >= 050 && c <= 052) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 454 | ins->oprs[c - 050].offset = gets8(data++); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 455 | ins->oprs[c - 050].segment |= SEG_RELATIVE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 456 | } else if (c >= 054 && c <= 056) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 457 | ins->oprs[c - 054].offset = getu64(data); |
| 458 | data += 8; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 459 | } else if (c >= 060 && c <= 062) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 460 | ins->oprs[c - 060].offset = gets16(data); |
| 461 | data += 2; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 462 | ins->oprs[c - 060].segment |= SEG_RELATIVE; |
| 463 | ins->oprs[c - 060].segment &= ~SEG_32BIT; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 464 | } else if (c >= 064 && c <= 066) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 465 | if (osize == 32) { |
| 466 | ins->oprs[c - 064].offset = getu32(data); |
| 467 | data += 4; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 468 | ins->oprs[c - 064].segment |= SEG_32BIT; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 469 | } else { |
| 470 | ins->oprs[c - 064].offset = getu16(data); |
| 471 | data += 2; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 472 | ins->oprs[c - 064].segment &= ~SEG_32BIT; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 473 | } |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 474 | if (segsize != osize) { |
| 475 | ins->oprs[c - 064].type = |
| 476 | (ins->oprs[c - 064].type & NON_SIZE) |
| 477 | | ((osize == 16) ? BITS16 : BITS32); |
| 478 | } |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 479 | } else if (c >= 070 && c <= 072) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 480 | ins->oprs[c - 070].offset = getu32(data); |
| 481 | data += 4; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 482 | ins->oprs[c - 070].segment |= SEG_32BIT | SEG_RELATIVE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 483 | } else if (c >= 0100 && c < 0130) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 484 | int modrm = *data++; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 485 | ins->oprs[c & 07].basereg = ((modrm >> 3)&7)+(rex & REX_R ? 8 : 0); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 486 | ins->oprs[c & 07].segment |= SEG_RMREG; |
| 487 | data = do_ea(data, modrm, asize, segsize, |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 488 | &ins->oprs[(c >> 3) & 07], rex); |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 489 | } else if (c >= 0130 && c <= 0132) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 490 | ins->oprs[c - 0130].offset = getu16(data); |
| 491 | data += 2; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 492 | } else if (c >= 0140 && c <= 0142) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 493 | ins->oprs[c - 0140].offset = getu32(data); |
| 494 | data += 4; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 495 | } else if (c >= 0200 && c <= 0277) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 496 | int modrm = *data++; |
| 497 | if (((modrm >> 3) & 07) != (c & 07)) |
| 498 | return FALSE; /* spare field doesn't match up */ |
| 499 | data = do_ea(data, modrm, asize, segsize, |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 500 | &ins->oprs[(c >> 3) & 07], rex); |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 501 | } else if (c >= 0300 && c <= 0302) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 502 | if (asize) |
| 503 | ins->oprs[c - 0300].segment |= SEG_32BIT; |
| 504 | else |
| 505 | ins->oprs[c - 0300].segment &= ~SEG_32BIT; |
| 506 | a_used = TRUE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 507 | } else if (c == 0310) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 508 | if (asize != 16) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 509 | return FALSE; |
| 510 | else |
| 511 | a_used = TRUE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 512 | } else if (c == 0311) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 513 | if (asize == 16) |
| 514 | return FALSE; |
| 515 | else |
| 516 | a_used = TRUE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 517 | } else if (c == 0312) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 518 | if (asize != segsize) |
| 519 | return FALSE; |
| 520 | else |
| 521 | a_used = TRUE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 522 | } else if (c == 0320) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 523 | if (osize != 16) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 524 | return FALSE; |
| 525 | else |
| 526 | o_used = TRUE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 527 | } else if (c == 0321) { |
| 528 | if (osize != 32) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 529 | return FALSE; |
| 530 | else |
| 531 | o_used = TRUE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 532 | } else if (c == 0322) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 533 | if (osize != (segsize == 16) ? 16 : 32) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 534 | return FALSE; |
| 535 | else |
| 536 | o_used = TRUE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 537 | } else if (c == 0323) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 538 | rex |= REX_W; /* 64-bit only instruction */ |
| 539 | osize = 64; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 540 | } else if (c == 0324) { |
| 541 | if (!(rex & REX_P) || osize != 64) |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 542 | return FALSE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 543 | } else if (c == 0330) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 544 | int t = *r++, d = *data++; |
| 545 | if (d < t || d > t + 15) |
| 546 | return FALSE; |
| 547 | else |
| 548 | ins->condition = d - t; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 549 | } else if (c == 0331) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 550 | if (rep) |
| 551 | return FALSE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 552 | } else if (c == 0332) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 553 | if (drep == P_REP) |
| 554 | drep = P_REPE; |
H. Peter Anvin | b061d59 | 2007-04-16 02:02:06 +0000 | [diff] [blame^] | 555 | } else if (c == 0333) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 556 | if (rep != 0xF3) |
| 557 | return FALSE; |
| 558 | drep = 0; |
| 559 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | /* |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 563 | * Check for unused rep or a/o prefixes. |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 564 | */ |
| 565 | ins->nprefix = 0; |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 566 | if (drep) |
| 567 | ins->prefixes[ins->nprefix++] = drep; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 568 | if (!a_used && asize != segsize) |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 569 | ins->prefixes[ins->nprefix++] = asize == 16 ? P_A16 : P_A32; |
| 570 | if (!o_used && osize == ((segsize == 16) ? 32 : 16)) { |
| 571 | fprintf(stderr, "osize = %d, segsize = %d\n", osize, segsize); |
| 572 | ins->prefixes[ins->nprefix++] = osize == 16 ? P_O16 : P_O32; |
| 573 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 574 | |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 575 | /* Fix: check for redundant REX prefixes */ |
| 576 | |
| 577 | *rexout = rex; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 578 | return data - origdata; |
| 579 | } |
| 580 | |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame] | 581 | int32_t disasm(uint8_t *data, char *output, int outbufsize, int segsize, |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 582 | int32_t offset, int autosync, uint32_t prefer) |
H. Peter Anvin | eba20a7 | 2002-04-30 20:53:55 +0000 | [diff] [blame] | 583 | { |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 584 | struct itemplate **p, **best_p; |
| 585 | int length, best_length = 0; |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame] | 586 | char *segover; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 587 | int rep, lock, asize, osize, i, slen, colon, rex, rexout, best_rex; |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 588 | uint8_t *origdata; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 589 | int works; |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 590 | insn tmp_ins, ins; |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 591 | uint32_t goodness, best; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 592 | |
| 593 | /* |
| 594 | * Scan for prefixes. |
| 595 | */ |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 596 | asize = segsize; |
| 597 | osize = (segsize == 64) ? 32 : segsize; |
| 598 | rex = 0; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 599 | segover = NULL; |
| 600 | rep = lock = 0; |
| 601 | origdata = data; |
| 602 | for (;;) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 603 | if (*data == 0xF3 || *data == 0xF2) |
| 604 | rep = *data++; |
| 605 | else if (*data == 0xF0) |
| 606 | lock = *data++; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 607 | else if (*data == 0x2E) |
| 608 | segover = "cs", data++; |
| 609 | else if (*data == 0x36) |
| 610 | segover = "ss", data++; |
| 611 | else if (*data == 0x3E) |
| 612 | segover = "ds", data++; |
| 613 | else if (*data == 0x26) |
| 614 | segover = "es", data++; |
| 615 | else if (*data == 0x64) |
| 616 | segover = "fs", data++; |
| 617 | else if (*data == 0x65) |
| 618 | segover = "gs", data++; |
| 619 | else if (*data == 0x66) { |
| 620 | if (segsize != 64) /* 66 prefix is ignored in 64-bit mode */ |
| 621 | osize = 48 - segsize; |
| 622 | data++; |
| 623 | } else if (*data == 0x67) { |
| 624 | asize = (segsize == 32) ? 16 : 32; |
| 625 | data++; |
| 626 | } else if (segsize == 64 && (*data & 0xf0) == REX_P) { |
| 627 | rex = *data++; |
| 628 | if (rex & REX_W) |
| 629 | osize = 64; |
| 630 | break; /* REX is always the last prefix */ |
| 631 | } else { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 632 | break; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 633 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 634 | } |
| 635 | |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 636 | tmp_ins.oprs[0].segment = tmp_ins.oprs[1].segment = |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 637 | tmp_ins.oprs[2].segment = |
| 638 | tmp_ins.oprs[0].addr_size = tmp_ins.oprs[1].addr_size = |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 639 | tmp_ins.oprs[2].addr_size = (segsize == 64 ? SEG_64BIT : |
| 640 | segsize == 32 ? SEG_32BIT : 0); |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 641 | tmp_ins.condition = -1; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 642 | best = -1; /* Worst possible */ |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 643 | best_p = NULL; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 644 | best_rex = 0; |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 645 | for (p = itable[*data]; *p; p++) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 646 | if ((length = matches(*p, data, asize, osize, |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 647 | segsize, rep, &tmp_ins, rex, &rexout))) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 648 | works = TRUE; |
| 649 | /* |
| 650 | * Final check to make sure the types of r/m match up. |
| 651 | */ |
| 652 | for (i = 0; i < (*p)->operands; i++) { |
| 653 | if ( |
| 654 | /* If it's a mem-only EA but we have a register, die. */ |
| 655 | ((tmp_ins.oprs[i].segment & SEG_RMREG) && |
| 656 | !(MEMORY & ~(*p)->opd[i])) || |
| 657 | /* If it's a reg-only EA but we have a memory ref, die. */ |
| 658 | (!(tmp_ins.oprs[i].segment & SEG_RMREG) && |
| 659 | !(REGNORM & ~(*p)->opd[i]) && |
| 660 | !((*p)->opd[i] & REG_SMASK)) || |
| 661 | /* Register type mismatch (eg FS vs REG_DESS): die. */ |
| 662 | ((((*p)->opd[i] & (REGISTER | FPUREG)) || |
| 663 | (tmp_ins.oprs[i].segment & SEG_RMREG)) && |
| 664 | !whichreg((*p)->opd[i], |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 665 | tmp_ins.oprs[i].basereg, rexout))) { |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 666 | works = FALSE; |
| 667 | break; |
| 668 | } |
| 669 | } |
| 670 | |
| 671 | if (works) { |
| 672 | goodness = ((*p)->flags & IF_PFMASK) ^ prefer; |
| 673 | if (goodness < best) { |
| 674 | /* This is the best one found so far */ |
| 675 | best = goodness; |
| 676 | best_p = p; |
| 677 | best_length = length; |
| 678 | ins = tmp_ins; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 679 | best_rex = rexout; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 680 | } |
| 681 | } |
| 682 | } |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 683 | } |
H. Peter Anvin | eba20a7 | 2002-04-30 20:53:55 +0000 | [diff] [blame] | 684 | |
H. Peter Anvin | ef7468f | 2002-04-30 20:57:59 +0000 | [diff] [blame] | 685 | if (!best_p) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 686 | return 0; /* no instruction was matched */ |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 687 | |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 688 | /* Pick the best match */ |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 689 | p = best_p; |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 690 | length = best_length; |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 691 | rex = best_rex; |
| 692 | if (best_rex & REX_W) |
| 693 | osize = 64; |
H. Peter Anvin | 4836e33 | 2002-04-30 20:56:43 +0000 | [diff] [blame] | 694 | |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 695 | slen = 0; |
| 696 | |
Ed Beroset | 64ab519 | 2004-12-15 23:32:57 +0000 | [diff] [blame] | 697 | /* TODO: snprintf returns the value that the string would have if |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 698 | * the buffer were long enough, and not the actual length of |
| 699 | * the returned string, so each instance of using the return |
| 700 | * value of snprintf should actually be checked to assure that |
| 701 | * the return value is "sane." Maybe a macro wrapper could |
| 702 | * be used for that purpose. |
| 703 | */ |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 704 | if (lock) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 705 | slen += snprintf(output + slen, outbufsize - slen, "lock "); |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 706 | for (i = 0; i < ins.nprefix; i++) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 707 | switch (ins.prefixes[i]) { |
| 708 | case P_REP: |
| 709 | slen += snprintf(output + slen, outbufsize - slen, "rep "); |
| 710 | break; |
| 711 | case P_REPE: |
| 712 | slen += snprintf(output + slen, outbufsize - slen, "repe "); |
| 713 | break; |
| 714 | case P_REPNE: |
| 715 | slen += snprintf(output + slen, outbufsize - slen, "repne "); |
| 716 | break; |
| 717 | case P_A16: |
| 718 | slen += snprintf(output + slen, outbufsize - slen, "a16 "); |
| 719 | break; |
| 720 | case P_A32: |
| 721 | slen += snprintf(output + slen, outbufsize - slen, "a32 "); |
| 722 | break; |
| 723 | case P_O16: |
| 724 | slen += snprintf(output + slen, outbufsize - slen, "o16 "); |
| 725 | break; |
| 726 | case P_O32: |
| 727 | slen += snprintf(output + slen, outbufsize - slen, "o32 "); |
| 728 | break; |
| 729 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 730 | |
| 731 | for (i = 0; i < elements(ico); i++) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 732 | if ((*p)->opcode == ico[i]) { |
| 733 | slen += |
| 734 | snprintf(output + slen, outbufsize - slen, "%s%s", icn[i], |
| 735 | whichcond(ins.condition)); |
| 736 | break; |
| 737 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 738 | if (i >= elements(ico)) |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 739 | slen += |
| 740 | snprintf(output + slen, outbufsize - slen, "%s", |
| 741 | insn_names[(*p)->opcode]); |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 742 | colon = FALSE; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 743 | length += data - origdata; /* fix up for prefixes */ |
| 744 | for (i = 0; i < (*p)->operands; i++) { |
| 745 | output[slen++] = (colon ? ':' : i == 0 ? ' ' : ','); |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 746 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 747 | if (ins.oprs[i].segment & SEG_RELATIVE) { |
| 748 | ins.oprs[i].offset += offset + length; |
| 749 | /* |
| 750 | * sort out wraparound |
| 751 | */ |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 752 | if (!(ins.oprs[i].segment & (SEG_32BIT|SEG_64BIT))) |
| 753 | ins.oprs[i].offset &= 0xffff; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 754 | /* |
| 755 | * add sync marker, if autosync is on |
| 756 | */ |
| 757 | if (autosync) |
| 758 | add_sync(ins.oprs[i].offset, 0L); |
| 759 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 760 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 761 | if ((*p)->opd[i] & COLON) |
| 762 | colon = TRUE; |
| 763 | else |
| 764 | colon = FALSE; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 765 | |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 766 | if (((*p)->opd[i] & (REGISTER | FPUREG)) || |
| 767 | (ins.oprs[i].segment & SEG_RMREG)) { |
| 768 | ins.oprs[i].basereg = whichreg((*p)->opd[i], |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 769 | ins.oprs[i].basereg, rex); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 770 | if ((*p)->opd[i] & TO) |
| 771 | slen += snprintf(output + slen, outbufsize - slen, "to "); |
| 772 | slen += snprintf(output + slen, outbufsize - slen, "%s", |
| 773 | reg_names[ins.oprs[i].basereg - |
| 774 | EXPR_REG_START]); |
| 775 | } else if (!(UNITY & ~(*p)->opd[i])) { |
| 776 | output[slen++] = '1'; |
| 777 | } else if ((*p)->opd[i] & IMMEDIATE) { |
| 778 | if ((*p)->opd[i] & BITS8) { |
| 779 | slen += |
| 780 | snprintf(output + slen, outbufsize - slen, "byte "); |
| 781 | if (ins.oprs[i].segment & SEG_SIGNED) { |
| 782 | if (ins.oprs[i].offset < 0) { |
| 783 | ins.oprs[i].offset *= -1; |
| 784 | output[slen++] = '-'; |
| 785 | } else |
| 786 | output[slen++] = '+'; |
| 787 | } |
| 788 | } else if ((*p)->opd[i] & BITS16) { |
| 789 | slen += |
| 790 | snprintf(output + slen, outbufsize - slen, "word "); |
| 791 | } else if ((*p)->opd[i] & BITS32) { |
| 792 | slen += |
| 793 | snprintf(output + slen, outbufsize - slen, "dword "); |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 794 | } else if ((*p)->opd[i] & BITS64) { |
| 795 | slen += |
| 796 | snprintf(output + slen, outbufsize - slen, "qword "); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 797 | } else if ((*p)->opd[i] & NEAR) { |
| 798 | slen += |
| 799 | snprintf(output + slen, outbufsize - slen, "near "); |
| 800 | } else if ((*p)->opd[i] & SHORT) { |
| 801 | slen += |
| 802 | snprintf(output + slen, outbufsize - slen, "short "); |
| 803 | } |
| 804 | slen += |
Keith Kanios | 93f2e9a | 2007-04-14 00:10:59 +0000 | [diff] [blame] | 805 | snprintf(output + slen, outbufsize - slen, "0x%"PRIx64"", |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 806 | ins.oprs[i].offset); |
| 807 | } else if (!(MEM_OFFS & ~(*p)->opd[i])) { |
| 808 | slen += |
Keith Kanios | 93f2e9a | 2007-04-14 00:10:59 +0000 | [diff] [blame] | 809 | snprintf(output + slen, outbufsize - slen, "[%s%s%s0x%"PRIx64"]", |
Keith Kanios | b7a8954 | 2007-04-12 02:40:54 +0000 | [diff] [blame] | 810 | ((const char*)segover ? (const char*)segover : ""), /* placate type mistmatch warning */ |
| 811 | ((const char*)segover ? ":" : ""), /* by using (const char*) instead of uint8_t* */ |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 812 | (ins.oprs[i].addr_size == |
| 813 | 32 ? "dword " : ins.oprs[i].addr_size == |
| 814 | 16 ? "word " : ""), ins.oprs[i].offset); |
| 815 | segover = NULL; |
| 816 | } else if (!(REGMEM & ~(*p)->opd[i])) { |
| 817 | int started = FALSE; |
| 818 | if ((*p)->opd[i] & BITS8) |
| 819 | slen += |
| 820 | snprintf(output + slen, outbufsize - slen, "byte "); |
| 821 | if ((*p)->opd[i] & BITS16) |
| 822 | slen += |
| 823 | snprintf(output + slen, outbufsize - slen, "word "); |
| 824 | if ((*p)->opd[i] & BITS32) |
| 825 | slen += |
| 826 | snprintf(output + slen, outbufsize - slen, "dword "); |
| 827 | if ((*p)->opd[i] & BITS64) |
| 828 | slen += |
| 829 | snprintf(output + slen, outbufsize - slen, "qword "); |
| 830 | if ((*p)->opd[i] & BITS80) |
| 831 | slen += |
| 832 | snprintf(output + slen, outbufsize - slen, "tword "); |
| 833 | if ((*p)->opd[i] & FAR) |
| 834 | slen += snprintf(output + slen, outbufsize - slen, "far "); |
| 835 | if ((*p)->opd[i] & NEAR) |
| 836 | slen += |
| 837 | snprintf(output + slen, outbufsize - slen, "near "); |
| 838 | output[slen++] = '['; |
| 839 | if (ins.oprs[i].addr_size) |
| 840 | slen += snprintf(output + slen, outbufsize - slen, "%s", |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 841 | (ins.oprs[i].addr_size == 64 ? "qword " : |
| 842 | ins.oprs[i].addr_size == 32 ? "dword " : |
| 843 | ins.oprs[i].addr_size == 16 ? "word " : |
| 844 | "")); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 845 | if (segover) { |
| 846 | slen += |
| 847 | snprintf(output + slen, outbufsize - slen, "%s:", |
| 848 | segover); |
| 849 | segover = NULL; |
| 850 | } |
| 851 | if (ins.oprs[i].basereg != -1) { |
| 852 | slen += snprintf(output + slen, outbufsize - slen, "%s", |
| 853 | reg_names[(ins.oprs[i].basereg - |
| 854 | EXPR_REG_START)]); |
| 855 | started = TRUE; |
| 856 | } |
| 857 | if (ins.oprs[i].indexreg != -1) { |
| 858 | if (started) |
| 859 | output[slen++] = '+'; |
| 860 | slen += snprintf(output + slen, outbufsize - slen, "%s", |
| 861 | reg_names[(ins.oprs[i].indexreg - |
| 862 | EXPR_REG_START)]); |
| 863 | if (ins.oprs[i].scale > 1) |
| 864 | slen += |
| 865 | snprintf(output + slen, outbufsize - slen, "*%d", |
| 866 | ins.oprs[i].scale); |
| 867 | started = TRUE; |
| 868 | } |
| 869 | if (ins.oprs[i].segment & SEG_DISP8) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 870 | int minus = 0; |
| 871 | int8_t offset = ins.oprs[i].offset; |
| 872 | if (offset < 0) { |
| 873 | minus = 1; |
| 874 | offset = -offset; |
| 875 | } |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 876 | slen += |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 877 | snprintf(output + slen, outbufsize - slen, "%s0x%"PRIx8"", |
| 878 | minus ? "-" : "+", offset); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 879 | } else if (ins.oprs[i].segment & SEG_DISP16) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 880 | int minus = 0; |
| 881 | int16_t offset = ins.oprs[i].offset; |
| 882 | if (offset < 0) { |
| 883 | minus = 1; |
| 884 | offset = -offset; |
| 885 | } |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 886 | slen += |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 887 | snprintf(output + slen, outbufsize - slen, "%s0x%"PRIx16"", |
| 888 | minus ? "-" : started ? "+" : "", offset); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 889 | } else if (ins.oprs[i].segment & SEG_DISP32) { |
H. Peter Anvin | 0ee0142 | 2007-04-16 01:18:30 +0000 | [diff] [blame] | 890 | char *prefix = ""; |
| 891 | int32_t offset = ins.oprs[i].offset; |
| 892 | if (ins.oprs[i].basereg == R_RIP) { |
| 893 | prefix = ":"; |
| 894 | } else if (offset < 0) { |
| 895 | offset = -offset; |
| 896 | prefix = "-"; |
| 897 | } else { |
| 898 | prefix = started ? "+" : ""; |
| 899 | } |
| 900 | slen += |
| 901 | snprintf(output + slen, outbufsize - slen, |
| 902 | "%s0x%"PRIx32"", prefix, offset); |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 903 | } |
| 904 | output[slen++] = ']'; |
| 905 | } else { |
| 906 | slen += |
| 907 | snprintf(output + slen, outbufsize - slen, "<operand%d>", |
| 908 | i); |
| 909 | } |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 910 | } |
| 911 | output[slen] = '\0'; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 912 | if (segover) { /* unused segment override */ |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame] | 913 | char *p = output; |
H. Peter Anvin | e2c8018 | 2005-01-15 22:15:51 +0000 | [diff] [blame] | 914 | int count = slen + 1; |
| 915 | while (count--) |
| 916 | p[count + 3] = p[count]; |
| 917 | strncpy(output, segover, 2); |
| 918 | output[2] = ' '; |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 919 | } |
| 920 | return length; |
| 921 | } |
| 922 | |
Keith Kanios | a6dfa78 | 2007-04-13 16:47:53 +0000 | [diff] [blame] | 923 | int32_t eatbyte(uint8_t *data, char *output, int outbufsize) |
H. Peter Anvin | eba20a7 | 2002-04-30 20:53:55 +0000 | [diff] [blame] | 924 | { |
Ed Beroset | 9234817 | 2004-12-15 18:27:50 +0000 | [diff] [blame] | 925 | snprintf(output, outbufsize, "db 0x%02X", *data); |
H. Peter Anvin | ea6e34d | 2002-04-30 20:51:32 +0000 | [diff] [blame] | 926 | return 1; |
| 927 | } |