Lines Matching +full:mod +full:- +full:12 +full:b
1 // SPDX-License-Identifier: GPL-2.0-or-later
23 ((insn)->next_byte + sizeof(t) + n <= (insn)->end_kaddr)
26 ({ t r = *(t*)insn->next_byte; insn->next_byte += sizeof(t); r; })
29 ({ t r = *(t*)((insn)->next_byte + n); r; })
40 * insn_init() - initialize struct insn
43 * @x86_64: !0 for 64-bit kernel or 64-bit app
55 insn->kaddr = kaddr; in insn_init()
56 insn->end_kaddr = kaddr + buf_len; in insn_init()
57 insn->next_byte = kaddr; in insn_init()
58 insn->x86_64 = x86_64 ? 1 : 0; in insn_init()
59 insn->opnd_bytes = 4; in insn_init()
61 insn->addr_bytes = 8; in insn_init()
63 insn->addr_bytes = 4; in insn_init()
79 insn->emulate_prefix_size = len; in __insn_get_emulate_prefix()
80 insn->next_byte += len; in __insn_get_emulate_prefix()
97 * insn_get_prefixes - scan x86 instruction prefix bytes
100 * Populates the @insn->prefixes bitmap, and updates @insn->next_byte
101 * to point to the (first) opcode. No effect if @insn->prefixes.got
110 struct insn_field *prefixes = &insn->prefixes; in insn_get_prefixes()
112 insn_byte_t b, lb; in insn_get_prefixes() local
115 if (prefixes->got) in insn_get_prefixes()
122 b = peek_next(insn_byte_t, insn); in insn_get_prefixes()
123 attr = inat_get_opcode_attribute(b); in insn_get_prefixes()
127 if (prefixes->bytes[i] == b) in insn_get_prefixes()
132 prefixes->bytes[nb++] = b; in insn_get_prefixes()
135 if (insn->x86_64) in insn_get_prefixes()
136 insn->addr_bytes ^= 12; in insn_get_prefixes()
138 insn->addr_bytes ^= 6; in insn_get_prefixes()
141 insn->opnd_bytes ^= 6; in insn_get_prefixes()
144 prefixes->nbytes++; in insn_get_prefixes()
145 insn->next_byte++; in insn_get_prefixes()
146 lb = b; in insn_get_prefixes()
147 b = peek_next(insn_byte_t, insn); in insn_get_prefixes()
148 attr = inat_get_opcode_attribute(b); in insn_get_prefixes()
151 if (lb && lb != insn->prefixes.bytes[3]) { in insn_get_prefixes()
152 if (unlikely(insn->prefixes.bytes[3])) { in insn_get_prefixes()
154 b = insn->prefixes.bytes[3]; in insn_get_prefixes()
156 if (prefixes->bytes[i] == lb) in insn_get_prefixes()
157 prefixes->bytes[i] = b; in insn_get_prefixes()
159 insn->prefixes.bytes[3] = lb; in insn_get_prefixes()
163 if (insn->x86_64) { in insn_get_prefixes()
164 b = peek_next(insn_byte_t, insn); in insn_get_prefixes()
165 attr = inat_get_opcode_attribute(b); in insn_get_prefixes()
167 insn->rex_prefix.value = b; in insn_get_prefixes()
168 insn->rex_prefix.nbytes = 1; in insn_get_prefixes()
169 insn->next_byte++; in insn_get_prefixes()
170 if (X86_REX_W(b)) in insn_get_prefixes()
172 insn->opnd_bytes = 8; in insn_get_prefixes()
175 insn->rex_prefix.got = 1; in insn_get_prefixes()
178 b = peek_next(insn_byte_t, insn); in insn_get_prefixes()
179 attr = inat_get_opcode_attribute(b); in insn_get_prefixes()
182 if (!insn->x86_64) { in insn_get_prefixes()
184 * In 32-bits mode, if the [7:6] bits (mod bits of in insn_get_prefixes()
185 * ModRM) on the second byte are not 11b, it is in insn_get_prefixes()
191 insn->vex_prefix.bytes[0] = b; in insn_get_prefixes()
192 insn->vex_prefix.bytes[1] = b2; in insn_get_prefixes()
195 insn->vex_prefix.bytes[2] = b2; in insn_get_prefixes()
197 insn->vex_prefix.bytes[3] = b2; in insn_get_prefixes()
198 insn->vex_prefix.nbytes = 4; in insn_get_prefixes()
199 insn->next_byte += 4; in insn_get_prefixes()
200 if (insn->x86_64 && X86_VEX_W(b2)) in insn_get_prefixes()
202 insn->opnd_bytes = 8; in insn_get_prefixes()
205 insn->vex_prefix.bytes[2] = b2; in insn_get_prefixes()
206 insn->vex_prefix.nbytes = 3; in insn_get_prefixes()
207 insn->next_byte += 3; in insn_get_prefixes()
208 if (insn->x86_64 && X86_VEX_W(b2)) in insn_get_prefixes()
210 insn->opnd_bytes = 8; in insn_get_prefixes()
213 * For VEX2, fake VEX3-like byte#2. in insn_get_prefixes()
217 insn->vex_prefix.bytes[2] = b2 & 0x7f; in insn_get_prefixes()
218 insn->vex_prefix.nbytes = 2; in insn_get_prefixes()
219 insn->next_byte += 2; in insn_get_prefixes()
223 insn->vex_prefix.got = 1; in insn_get_prefixes()
225 prefixes->got = 1; in insn_get_prefixes()
230 return -ENODATA; in insn_get_prefixes()
234 * insn_get_opcode - collect opcode(s)
237 * Populates @insn->opcode, updates @insn->next_byte to point past the
238 * opcode byte(s), and set @insn->attr (except for groups).
240 * Sets @insn->opcode.value = opcode1. No effect if @insn->opcode.got
249 struct insn_field *opcode = &insn->opcode; in insn_get_opcode()
253 if (opcode->got) in insn_get_opcode()
256 if (!insn->prefixes.got) { in insn_get_opcode()
264 opcode->bytes[0] = op; in insn_get_opcode()
265 opcode->nbytes = 1; in insn_get_opcode()
272 insn->attr = inat_get_avx_attribute(op, m, p); in insn_get_opcode()
273 if ((inat_must_evex(insn->attr) && !insn_is_evex(insn)) || in insn_get_opcode()
274 (!inat_accept_vex(insn->attr) && in insn_get_opcode()
275 !inat_is_group(insn->attr))) { in insn_get_opcode()
277 insn->attr = 0; in insn_get_opcode()
278 return -EINVAL; in insn_get_opcode()
284 insn->attr = inat_get_opcode_attribute(op); in insn_get_opcode()
285 while (inat_is_escape(insn->attr)) { in insn_get_opcode()
288 opcode->bytes[opcode->nbytes++] = op; in insn_get_opcode()
290 insn->attr = inat_get_escape_attribute(op, pfx_id, insn->attr); in insn_get_opcode()
293 if (inat_must_vex(insn->attr)) { in insn_get_opcode()
295 insn->attr = 0; in insn_get_opcode()
296 return -EINVAL; in insn_get_opcode()
299 opcode->got = 1; in insn_get_opcode()
303 return -ENODATA; in insn_get_opcode()
307 * insn_get_modrm - collect ModRM byte, if any
310 * Populates @insn->modrm and updates @insn->next_byte to point past the
312 * (prefixes and opcode(s)). No effect if @insn->modrm.got is already 1.
320 struct insn_field *modrm = &insn->modrm; in insn_get_modrm()
321 insn_byte_t pfx_id, mod; in insn_get_modrm() local
324 if (modrm->got) in insn_get_modrm()
327 if (!insn->opcode.got) { in insn_get_modrm()
333 if (inat_has_modrm(insn->attr)) { in insn_get_modrm()
334 mod = get_next(insn_byte_t, insn); in insn_get_modrm()
335 modrm->value = mod; in insn_get_modrm()
336 modrm->nbytes = 1; in insn_get_modrm()
337 if (inat_is_group(insn->attr)) { in insn_get_modrm()
339 insn->attr = inat_get_group_attribute(mod, pfx_id, in insn_get_modrm()
340 insn->attr); in insn_get_modrm()
341 if (insn_is_avx(insn) && !inat_accept_vex(insn->attr)) { in insn_get_modrm()
343 insn->attr = 0; in insn_get_modrm()
344 return -EINVAL; in insn_get_modrm()
349 if (insn->x86_64 && inat_is_force64(insn->attr)) in insn_get_modrm()
350 insn->opnd_bytes = 8; in insn_get_modrm()
352 modrm->got = 1; in insn_get_modrm()
356 return -ENODATA; in insn_get_modrm()
361 * insn_rip_relative() - Does instruction use RIP-relative addressing mode?
365 * ModRM byte. No effect if @insn->x86_64 is 0.
369 struct insn_field *modrm = &insn->modrm; in insn_rip_relative()
372 if (!insn->x86_64) in insn_rip_relative()
375 if (!modrm->got) { in insn_rip_relative()
381 * For rip-relative instructions, the mod field (top 2 bits) in insn_rip_relative()
384 return (modrm->nbytes && (modrm->value & 0xc7) == 0x5); in insn_rip_relative()
388 * insn_get_sib() - Get the SIB byte of instruction
403 if (insn->sib.got) in insn_get_sib()
406 if (!insn->modrm.got) { in insn_get_sib()
412 if (insn->modrm.nbytes) { in insn_get_sib()
413 modrm = (insn_byte_t)insn->modrm.value; in insn_get_sib()
414 if (insn->addr_bytes != 2 && in insn_get_sib()
416 insn->sib.value = get_next(insn_byte_t, insn); in insn_get_sib()
417 insn->sib.nbytes = 1; in insn_get_sib()
420 insn->sib.got = 1; in insn_get_sib()
425 return -ENODATA; in insn_get_sib()
430 * insn_get_displacement() - Get the displacement of instruction
435 * Displacement value is sign-expanded.
443 insn_byte_t mod, rm, base; in insn_get_displacement() local
446 if (insn->displacement.got) in insn_get_displacement()
449 if (!insn->sib.got) { in insn_get_displacement()
455 if (insn->modrm.nbytes) { in insn_get_displacement()
458 * mod = 00 - no displacement fields (exceptions below) in insn_get_displacement()
459 * mod = 01 - 1-byte displacement field in insn_get_displacement()
460 * mod = 10 - displacement field is 4 bytes, or 2 bytes if in insn_get_displacement()
461 * address size = 2 (0x67 prefix in 32-bit mode) in insn_get_displacement()
462 * mod = 11 - no memory operand in insn_get_displacement()
465 * mod = 00, r/m = 110 - displacement field is 2 bytes in insn_get_displacement()
468 * mod != 11, r/m = 100 - SIB byte exists in insn_get_displacement()
469 * mod = 00, SIB base = 101 - displacement field is 4 bytes in insn_get_displacement()
470 * mod = 00, r/m = 101 - rip-relative addressing, displacement in insn_get_displacement()
473 mod = X86_MODRM_MOD(insn->modrm.value); in insn_get_displacement()
474 rm = X86_MODRM_RM(insn->modrm.value); in insn_get_displacement()
475 base = X86_SIB_BASE(insn->sib.value); in insn_get_displacement()
476 if (mod == 3) in insn_get_displacement()
478 if (mod == 1) { in insn_get_displacement()
479 insn->displacement.value = get_next(signed char, insn); in insn_get_displacement()
480 insn->displacement.nbytes = 1; in insn_get_displacement()
481 } else if (insn->addr_bytes == 2) { in insn_get_displacement()
482 if ((mod == 0 && rm == 6) || mod == 2) { in insn_get_displacement()
483 insn->displacement.value = in insn_get_displacement()
485 insn->displacement.nbytes = 2; in insn_get_displacement()
488 if ((mod == 0 && rm == 5) || mod == 2 || in insn_get_displacement()
489 (mod == 0 && base == 5)) { in insn_get_displacement()
490 insn->displacement.value = get_next(int, insn); in insn_get_displacement()
491 insn->displacement.nbytes = 4; in insn_get_displacement()
496 insn->displacement.got = 1; in insn_get_displacement()
500 return -ENODATA; in insn_get_displacement()
506 switch (insn->addr_bytes) { in __get_moffset()
508 insn->moffset1.value = get_next(short, insn); in __get_moffset()
509 insn->moffset1.nbytes = 2; in __get_moffset()
512 insn->moffset1.value = get_next(int, insn); in __get_moffset()
513 insn->moffset1.nbytes = 4; in __get_moffset()
516 insn->moffset1.value = get_next(int, insn); in __get_moffset()
517 insn->moffset1.nbytes = 4; in __get_moffset()
518 insn->moffset2.value = get_next(int, insn); in __get_moffset()
519 insn->moffset2.nbytes = 4; in __get_moffset()
524 insn->moffset1.got = insn->moffset2.got = 1; in __get_moffset()
535 switch (insn->opnd_bytes) { in __get_immv32()
537 insn->immediate.value = get_next(short, insn); in __get_immv32()
538 insn->immediate.nbytes = 2; in __get_immv32()
542 insn->immediate.value = get_next(int, insn); in __get_immv32()
543 insn->immediate.nbytes = 4; in __get_immv32()
558 switch (insn->opnd_bytes) { in __get_immv()
560 insn->immediate1.value = get_next(short, insn); in __get_immv()
561 insn->immediate1.nbytes = 2; in __get_immv()
564 insn->immediate1.value = get_next(int, insn); in __get_immv()
565 insn->immediate1.nbytes = 4; in __get_immv()
568 insn->immediate1.value = get_next(int, insn); in __get_immv()
569 insn->immediate1.nbytes = 4; in __get_immv()
570 insn->immediate2.value = get_next(int, insn); in __get_immv()
571 insn->immediate2.nbytes = 4; in __get_immv()
576 insn->immediate1.got = insn->immediate2.got = 1; in __get_immv()
586 switch (insn->opnd_bytes) { in __get_immptr()
588 insn->immediate1.value = get_next(short, insn); in __get_immptr()
589 insn->immediate1.nbytes = 2; in __get_immptr()
592 insn->immediate1.value = get_next(int, insn); in __get_immptr()
593 insn->immediate1.nbytes = 4; in __get_immptr()
601 insn->immediate2.value = get_next(unsigned short, insn); in __get_immptr()
602 insn->immediate2.nbytes = 2; in __get_immptr()
603 insn->immediate1.got = insn->immediate2.got = 1; in __get_immptr()
611 * insn_get_immediate() - Get the immediate in an instruction
616 * Basically, most of immediates are sign-expanded. Unsigned-value can be
617 * computed by bit masking with ((1 << (nbytes * 8)) - 1)
627 if (insn->immediate.got) in insn_get_immediate()
630 if (!insn->displacement.got) { in insn_get_immediate()
636 if (inat_has_moffset(insn->attr)) { in insn_get_immediate()
642 if (!inat_has_immediate(insn->attr)) in insn_get_immediate()
646 switch (inat_immediate_size(insn->attr)) { in insn_get_immediate()
648 insn->immediate.value = get_next(signed char, insn); in insn_get_immediate()
649 insn->immediate.nbytes = 1; in insn_get_immediate()
652 insn->immediate.value = get_next(short, insn); in insn_get_immediate()
653 insn->immediate.nbytes = 2; in insn_get_immediate()
656 insn->immediate.value = get_next(int, insn); in insn_get_immediate()
657 insn->immediate.nbytes = 4; in insn_get_immediate()
660 insn->immediate1.value = get_next(int, insn); in insn_get_immediate()
661 insn->immediate1.nbytes = 4; in insn_get_immediate()
662 insn->immediate2.value = get_next(int, insn); in insn_get_immediate()
663 insn->immediate2.nbytes = 4; in insn_get_immediate()
681 if (inat_has_second_immediate(insn->attr)) { in insn_get_immediate()
682 insn->immediate2.value = get_next(signed char, insn); in insn_get_immediate()
683 insn->immediate2.nbytes = 1; in insn_get_immediate()
686 insn->immediate.got = 1; in insn_get_immediate()
690 return -ENODATA; in insn_get_immediate()
694 * insn_get_length() - Get the length of instruction
701 * - 0 on success
702 * - < 0 on error
708 if (insn->length) in insn_get_length()
711 if (!insn->immediate.got) { in insn_get_length()
717 insn->length = (unsigned char)((unsigned long)insn->next_byte in insn_get_length()
718 - (unsigned long)insn->kaddr); in insn_get_length()
724 * insn_decode() - Decode an x86 instruction
738 /* #define INSN_MODE_KERN -1 __ignore_sync_check__ mode is only valid in the kernel */ in insn_decode()
752 return -EINVAL; in insn_decode()