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cosmopolitan/third_party/xed/x86ild.greg.c

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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2018 Intel Corporation │
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Licensed under the Apache License, Version 2.0 (the "License"); │
│ you may not use this file except in compliance with the License. │
│ You may obtain a copy of the License at │
│ │
│ http://www.apache.org/licenses/LICENSE-2.0 │
│ │
│ Unless required by applicable law or agreed to in writing, software │
│ distributed under the License is distributed on an "AS IS" BASIS, │
│ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. │
│ See the License for the specific language governing permissions and │
│ limitations under the License. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/bits/bits.h"
#include "libc/dce.h"
#include "libc/macros.h"
#include "libc/nexgen32e/bsr.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "third_party/xed/avx.h"
#include "third_party/xed/avx512.h"
#include "third_party/xed/private.h"
#include "third_party/xed/x86.h"
asm(".ident\t\"\\n\\n\
Xed (Apache 2.0)\\n\
Copyright 2018 Intel Corporation\\n\
Copyright 2019 Justine Alexandra Roberts Tunney\\n\
Modifications: Trimmed down to 3kb [2019-03-22 jart]\"");
asm(".include \"libc/disclaimer.inc\"");
#define XED_ILD_HASMODRM_IGNORE_MOD 2
#define XED_I_LF_BRDISP8_BRDISP_WIDTH_CONST_l2 1
#define XED_I_LF_BRDISPz_BRDISP_WIDTH_OSZ_NONTERM_EOSZ_l2 2
#define XED_I_LF_DISP_BUCKET_0_l1 3
#define XED_I_LF_EMPTY_DISP_CONST_l2 4
#define XED_I_LF_MEMDISPv_DISP_WIDTH_ASZ_NONTERM_EASZ_l2 5
#define XED_I_LF_RESOLVE_BYREG_DISP_map0x0_op0xc7_l1 6
#define XED_I_LF_0_IMM_WIDTH_CONST_l2 1
#define XED_I_LF_RESOLVE_BYREG_IMM_WIDTH_map0x0_op0xc7_l1 2
#define XED_I_LF_RESOLVE_BYREG_IMM_WIDTH_map0x0_op0xf6_l1 3
#define XED_I_LF_RESOLVE_BYREG_IMM_WIDTH_map0x0_op0xf7_l1 4
#define XED_I_LF_SIMM8_IMM_WIDTH_CONST_l2 5
#define XED_I_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_DF64_EOSZ_l2 6
#define XED_I_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_EOSZ_l2 7
#define XED_I_LF_UIMM16_IMM_WIDTH_CONST_l2 8
#define XED_I_LF_UIMM8_IMM_WIDTH_CONST_l2 9
#define XED_I_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_EOSZ_l2 10
#define xed_i_ild_hasimm_map0x0_op0xc8_l1 11
#define xed_i_ild_hasimm_map0x0F_op0x78_l1 12
#define XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_IGNORE66_EOSZ_l2(X) \
xed_set_simmz_imm_width_eosz(X, kXed.OSZ_NONTERM_IGNORE66_EOSZ)
#define XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_REFINING66_EOSZ_l2(X) \
xed_set_simmz_imm_width_eosz(X, kXed.OSZ_NONTERM_REFINING66_EOSZ)
#define XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_DF64_FORCE64_EOSZ_l2(X) \
xed_set_simmz_imm_width_eosz(X, kXed.OSZ_NONTERM_DF64_FORCE64_EOSZ)
#define XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_FORCE64_EOSZ_l2(X) \
xed_set_simmz_imm_width_eosz(X, kXed.OSZ_NONTERM_FORCE64_EOSZ)
#define XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_EOSZ_l2(X) \
xed_set_simmz_imm_width_eosz(X, kXed.OSZ_NONTERM_EOSZ)
#define XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_REFINING66_CR_WIDTH_EOSZ_l2(X) \
xed_set_simmz_imm_width_eosz(X, kXed.OSZ_NONTERM_REFINING66_CR_WIDTH_EOSZ)
#define XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_DF64_EOSZ_l2(X) \
xed_set_simmz_imm_width_eosz(X, kXed.OSZ_NONTERM_DF64_EOSZ)
#define XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_DF64_IMMUNE66_LOOP64_EOSZ_l2(X) \
xed_set_simmz_imm_width_eosz(X, kXed.OSZ_NONTERM_DF64_IMMUNE66_LOOP64_EOSZ)
#define XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_IMMUNE66_EOSZ_l2(X) \
xed_set_simmz_imm_width_eosz(X, kXed.OSZ_NONTERM_IMMUNE66_EOSZ)
#define XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_CR_WIDTH_EOSZ_l2(X) \
xed_set_simmz_imm_width_eosz(X, kXed.OSZ_NONTERM_CR_WIDTH_EOSZ)
#define XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_IMMUNE_REXW_EOSZ_l2(X) \
xed_set_simmz_imm_width_eosz(X, kXed.OSZ_NONTERM_IMMUNE_REXW_EOSZ)
#define XED_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_IGNORE66_EOSZ_l2(X) \
xed_set_uimmv_imm_width_eosz(X, kXed.OSZ_NONTERM_IGNORE66_EOSZ)
#define XED_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_REFINING66_EOSZ_l2(X) \
xed_set_uimmv_imm_width_eosz(X, kXed.OSZ_NONTERM_REFINING66_EOSZ)
#define XED_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_DF64_FORCE64_EOSZ_l2(X) \
xed_set_uimmv_imm_width_eosz(X, kXed.OSZ_NONTERM_DF64_FORCE64_EOSZ)
#define XED_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_FORCE64_EOSZ_l2(X) \
xed_set_uimmv_imm_width_eosz(X, kXed.OSZ_NONTERM_FORCE64_EOSZ)
#define XED_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_EOSZ_l2(X) \
xed_set_uimmv_imm_width_eosz(X, kXed.OSZ_NONTERM_EOSZ)
#define XED_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_REFINING66_CR_WIDTH_EOSZ_l2(X) \
xed_set_uimmv_imm_width_eosz(X, kXed.OSZ_NONTERM_REFINING66_CR_WIDTH_EOSZ)
#define XED_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_DF64_EOSZ_l2(X) \
xed_set_uimmv_imm_width_eosz(X, kXed.OSZ_NONTERM_DF64_EOSZ)
#define XED_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_DF64_IMMUNE66_LOOP64_EOSZ_l2(X) \
xed_set_uimmv_imm_width_eosz(X, kXed.OSZ_NONTERM_DF64_IMMUNE66_LOOP64_EOSZ)
#define XED_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_IMMUNE66_EOSZ_l2(X) \
xed_set_uimmv_imm_width_eosz(X, kXed.OSZ_NONTERM_IMMUNE66_EOSZ)
#define XED_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_CR_WIDTH_EOSZ_l2(X) \
xed_set_uimmv_imm_width_eosz(X, kXed.OSZ_NONTERM_CR_WIDTH_EOSZ)
#define XED_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_IMMUNE_REXW_EOSZ_l2(X) \
xed_set_uimmv_imm_width_eosz(X, kXed.OSZ_NONTERM_IMMUNE_REXW_EOSZ)
extern const uint32_t xed_prefix_table_bit[8] hidden;
extern const uint8_t xed_imm_bits_2d[2][256] hidden;
extern const uint8_t xed_has_modrm_2d[XED_ILD_MAP2][256] hidden;
extern const uint8_t xed_has_sib_table[3][4][8] hidden;
extern const uint8_t xed_has_disp_regular[3][4][8] hidden;
extern const uint8_t xed_disp_bits_2d[XED_ILD_MAP2][256] hidden;
static const struct XedDenseMagnums {
unsigned vex_prefix_recoding[4];
xed_bits_t eamode[2][3];
xed_bits_t BRDISPz_BRDISP_WIDTH[4];
xed_bits_t MEMDISPv_DISP_WIDTH[4];
xed_bits_t SIMMz_IMM_WIDTH[4];
xed_bits_t UIMMv_IMM_WIDTH[4];
xed_bits_t ASZ_NONTERM_EASZ[2][3];
xed_bits_t OSZ_NONTERM_CR_WIDTH_EOSZ[2][2][3];
xed_bits_t OSZ_NONTERM_DF64_EOSZ[2][2][3];
xed_bits_t OSZ_NONTERM_DF64_FORCE64_EOSZ[2][2][3];
xed_bits_t OSZ_NONTERM_DF64_IMMUNE66_LOOP64_EOSZ[2][2][3];
xed_bits_t OSZ_NONTERM_EOSZ[2][2][3];
xed_bits_t OSZ_NONTERM_FORCE64_EOSZ[2][2][3];
xed_bits_t OSZ_NONTERM_IGNORE66_EOSZ[2][2][3];
xed_bits_t OSZ_NONTERM_IMMUNE66_EOSZ[2][2][3];
xed_bits_t OSZ_NONTERM_IMMUNE_REXW_EOSZ[2][2][3];
xed_bits_t OSZ_NONTERM_REFINING66_CR_WIDTH_EOSZ[2][2][3];
xed_bits_t OSZ_NONTERM_REFINING66_EOSZ[2][2][3];
} kXed = {
.vex_prefix_recoding = {0, 1, 3, 2},
.BRDISPz_BRDISP_WIDTH = {0, 16, 32, 32},
.MEMDISPv_DISP_WIDTH = {0, 16, 32, 64},
.SIMMz_IMM_WIDTH = {0x00, 0x10, 0x20, 0x20},
.UIMMv_IMM_WIDTH = {0x00, 0x10, 0x20, 0x40},
.ASZ_NONTERM_EASZ =
{
[0][0] = 0x1,
[1][0] = 0x2,
[0][1] = 0x2,
[1][1] = 0x1,
[0][2] = 0x3,
[1][2] = 0x2,
},
.OSZ_NONTERM_CR_WIDTH_EOSZ =
{
[0][0][0] = 0x2,
[1][0][0] = 0x2,
[0][1][0] = 0x2,
[1][1][0] = 0x2,
[0][1][1] = 0x2,
[1][1][1] = 0x2,
[0][0][1] = 0x2,
[1][0][1] = 0x2,
[0][1][2] = 0x3,
[0][0][2] = 0x3,
[1][1][2] = 0x3,
[1][0][2] = 0x3,
},
.OSZ_NONTERM_DF64_EOSZ =
{
[0][0][0] = 0x1,
[1][0][0] = 0x1,
[0][1][0] = 0x2,
[1][1][0] = 0x2,
[0][1][1] = 0x1,
[1][1][1] = 0x1,
[0][0][1] = 0x2,
[1][0][1] = 0x2,
[0][1][2] = 0x1,
[0][0][2] = 0x3,
[1][1][2] = 0x3,
[1][0][2] = 0x3,
},
.OSZ_NONTERM_DF64_FORCE64_EOSZ =
{
[0][0][0] = 0x1,
[1][0][0] = 0x1,
[0][1][0] = 0x2,
[1][1][0] = 0x2,
[0][1][1] = 0x1,
[1][1][1] = 0x1,
[0][0][1] = 0x2,
[1][0][1] = 0x2,
[0][1][2] = 0x3,
[0][0][2] = 0x3,
[1][1][2] = 0x3,
[1][0][2] = 0x3,
},
.OSZ_NONTERM_DF64_IMMUNE66_LOOP64_EOSZ =
{
[0][0][0] = 0x1,
[1][0][0] = 0x1,
[0][1][0] = 0x2,
[1][1][0] = 0x2,
[0][1][1] = 0x1,
[1][1][1] = 0x1,
[0][0][1] = 0x2,
[1][0][1] = 0x2,
[0][1][2] = 0x3,
[0][0][2] = 0x3,
[1][1][2] = 0x3,
[1][0][2] = 0x3,
},
.OSZ_NONTERM_EOSZ =
{
[0][0][0] = 0x1,
[1][0][0] = 0x1,
[0][1][0] = 0x2,
[1][1][0] = 0x2,
[0][1][1] = 0x1,
[1][1][1] = 0x1,
[0][0][1] = 0x2,
[1][0][1] = 0x2,
[0][1][2] = 0x1,
[0][0][2] = 0x2,
[1][1][2] = 0x3,
[1][0][2] = 0x3,
},
.OSZ_NONTERM_FORCE64_EOSZ =
{
[0][0][0] = 0x1,
[1][0][0] = 0x1,
[0][1][0] = 0x2,
[1][1][0] = 0x2,
[0][1][1] = 0x1,
[1][1][1] = 0x1,
[0][0][1] = 0x2,
[1][0][1] = 0x2,
[0][1][2] = 0x3,
[0][0][2] = 0x3,
[1][1][2] = 0x3,
[1][0][2] = 0x3,
},
.OSZ_NONTERM_IGNORE66_EOSZ =
{
[0][0][0] = 0x1,
[1][0][0] = 0x1,
[0][1][0] = 0x1,
[1][1][0] = 0x1,
[0][1][1] = 0x2,
[1][1][1] = 0x2,
[0][0][1] = 0x2,
[1][0][1] = 0x2,
[0][1][2] = 0x2,
[0][0][2] = 0x2,
[1][1][2] = 0x3,
[1][0][2] = 0x3,
},
.OSZ_NONTERM_IMMUNE66_EOSZ =
{
[0][0][0] = 0x2,
[1][0][0] = 0x2,
[0][1][0] = 0x2,
[1][1][0] = 0x2,
[0][1][1] = 0x2,
[1][1][1] = 0x2,
[0][0][1] = 0x2,
[1][0][1] = 0x2,
[0][1][2] = 0x2,
[0][0][2] = 0x2,
[1][1][2] = 0x3,
[1][0][2] = 0x3,
},
.OSZ_NONTERM_IMMUNE_REXW_EOSZ =
{
[0][0][0] = 0x1,
[1][0][0] = 0x1,
[0][1][0] = 0x2,
[1][1][0] = 0x2,
[0][1][1] = 0x1,
[1][1][1] = 0x1,
[0][0][1] = 0x2,
[1][0][1] = 0x2,
[0][1][2] = 0x1,
[0][0][2] = 0x2,
[1][1][2] = 0x2,
[1][0][2] = 0x2,
},
.OSZ_NONTERM_REFINING66_CR_WIDTH_EOSZ =
{
[0][0][0] = 0x2,
[1][0][0] = 0x2,
[0][1][0] = 0x2,
[1][1][0] = 0x2,
[0][1][1] = 0x2,
[1][1][1] = 0x2,
[0][0][1] = 0x2,
[1][0][1] = 0x2,
[0][1][2] = 0x3,
[0][0][2] = 0x3,
[1][1][2] = 0x3,
[1][0][2] = 0x3,
},
.OSZ_NONTERM_REFINING66_EOSZ =
{
[0][0][0] = 0x1,
[1][0][0] = 0x1,
[0][1][0] = 0x1,
[1][1][0] = 0x1,
[0][1][1] = 0x2,
[1][1][1] = 0x2,
[0][0][1] = 0x2,
[1][0][1] = 0x2,
[0][1][2] = 0x2,
[0][0][2] = 0x2,
[1][1][2] = 0x3,
[1][0][2] = 0x3,
},
.eamode =
{
[0][XED_MODE_REAL] = XED_MODE_REAL,
[0][XED_MODE_LEGACY] = XED_MODE_LEGACY,
[0][XED_MODE_LONG] = XED_MODE_LONG,
[1][XED_MODE_REAL] = XED_MODE_LEGACY,
[1][XED_MODE_LEGACY] = XED_MODE_REAL,
[1][XED_MODE_LONG] = XED_MODE_LEGACY,
},
};
privileged static void xed_too_short(struct XedDecodedInst *d) {
d->op.out_of_bytes = 1;
if (d->op.max_bytes >= 15) {
d->op.error = XED_ERROR_INSTR_TOO_LONG;
} else {
d->op.error = XED_ERROR_BUFFER_TOO_SHORT;
}
}
privileged static void xed_bad_map(struct XedDecodedInst *d) {
d->op.map = XED_ILD_MAP_INVALID;
d->op.error = XED_ERROR_BAD_MAP;
}
privileged static void xed_bad_v4(struct XedDecodedInst *d) {
d->op.error = XED_ERROR_BAD_EVEX_V_PRIME;
}
privileged static void xed_bad_z_aaa(struct XedDecodedInst *d) {
d->op.error = XED_ERROR_BAD_EVEX_Z_NO_MASKING;
}
privileged static xed_bits_t xed_get_prefix_table_bit(xed_bits_t a) {
return (xed_prefix_table_bit[a >> 5] >> (a & 0x1F)) & 1;
}
privileged static size_t xed_bits2bytes(unsigned bits) {
return bits >> 3;
}
privileged static size_t xed_bytes2bits(unsigned bytes) {
return bytes << 3;
}
privileged static bool xed3_mode_64b(struct XedDecodedInst *d) {
return d->op.mode == XED_MODE_LONG;
}
privileged static void xed_set_hint(char b, struct XedDecodedInst *d) {
switch (b) {
case 0x2e:
d->op.hint = XED_HINT_NTAKEN;
return;
case 0x3e:
d->op.hint = XED_HINT_TAKEN;
return;
default:
break;
}
}
privileged static void XED_LF_SIMM8_IMM_WIDTH_CONST_l2(
struct XedDecodedInst *x) {
x->op.imm_width = 8;
x->op.imm_signed = true;
}
privileged static void XED_LF_UIMM16_IMM_WIDTH_CONST_l2(
struct XedDecodedInst *x) {
x->op.imm_width = 16;
}
privileged static void XED_LF_SE_IMM8_IMM_WIDTH_CONST_l2(
struct XedDecodedInst *x) {
x->op.imm_width = 8;
}
privileged static void XED_LF_UIMM32_IMM_WIDTH_CONST_l2(
struct XedDecodedInst *x) {
x->op.imm_width = 32;
}
privileged static void xed_set_simmz_imm_width_eosz(
struct XedDecodedInst *x, const xed_bits_t eosz[2][2][3]) {
x->op.imm_width =
kXed.SIMMz_IMM_WIDTH[eosz[x->op.rexw][x->op.osz][x->op.mode]];
x->op.imm_signed = true;
}
privileged static void xed_set_uimmv_imm_width_eosz(
struct XedDecodedInst *x, const xed_bits_t eosz[2][2][3]) {
x->op.imm_width =
kXed.UIMMv_IMM_WIDTH[eosz[x->op.rexw][x->op.osz][x->op.mode]];
}
privileged static void XED_LF_UIMM8_IMM_WIDTH_CONST_l2(
struct XedDecodedInst *x) {
x->op.imm_width = 8;
}
privileged static void XED_LF_0_IMM_WIDTH_CONST_l2(struct XedDecodedInst *x) {
x->op.imm_width = 0;
}
privileged static void XED_LF_RESOLVE_BYREG_IMM_WIDTH_map0x0_op0xc7_l1(
struct XedDecodedInst *x) {
switch (x->op.reg) {
case 0:
XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_EOSZ_l2(x);
break;
case 7:
XED_LF_0_IMM_WIDTH_CONST_l2(x);
break;
default:
break;
}
}
privileged static void XED_LF_RESOLVE_BYREG_IMM_WIDTH_map0x0_op0xf6_l1(
struct XedDecodedInst *x) {
if (x->op.reg <= 1) {
XED_LF_SIMM8_IMM_WIDTH_CONST_l2(x);
} else if (2 <= x->op.reg && x->op.reg <= 7) {
XED_LF_0_IMM_WIDTH_CONST_l2(x);
}
}
privileged static void XED_LF_RESOLVE_BYREG_IMM_WIDTH_map0x0_op0xf7_l1(
struct XedDecodedInst *x) {
if (x->op.reg <= 1) {
XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_EOSZ_l2(x);
} else if (2 <= x->op.reg && x->op.reg <= 7) {
XED_LF_0_IMM_WIDTH_CONST_l2(x);
}
}
privileged static void xed_ild_hasimm_map0x0F_op0x78_l1(
struct XedDecodedInst *x) {
if (x->op.osz || x->op.ild_f2) {
x->op.imm_width = xed_bytes2bits(1);
x->op.imm1_bytes = 1;
}
}
privileged static void xed_ild_hasimm_map0x0_op0xc8_l1(
struct XedDecodedInst *x) {
x->op.imm_width = xed_bytes2bits(2);
x->op.imm1_bytes = 1;
}
privileged static void xed_set_imm_bytes(struct XedDecodedInst *d) {
if (!d->op.imm_width && d->op.map < XED_ILD_MAP2) {
switch (xed_imm_bits_2d[d->op.map][d->op.opcode]) {
case XED_I_LF_0_IMM_WIDTH_CONST_l2:
XED_LF_0_IMM_WIDTH_CONST_l2(d);
break;
case XED_I_LF_RESOLVE_BYREG_IMM_WIDTH_map0x0_op0xc7_l1:
XED_LF_RESOLVE_BYREG_IMM_WIDTH_map0x0_op0xc7_l1(d);
break;
case XED_I_LF_RESOLVE_BYREG_IMM_WIDTH_map0x0_op0xf6_l1:
XED_LF_RESOLVE_BYREG_IMM_WIDTH_map0x0_op0xf6_l1(d);
break;
case XED_I_LF_RESOLVE_BYREG_IMM_WIDTH_map0x0_op0xf7_l1:
XED_LF_RESOLVE_BYREG_IMM_WIDTH_map0x0_op0xf7_l1(d);
break;
case XED_I_LF_SIMM8_IMM_WIDTH_CONST_l2:
XED_LF_SIMM8_IMM_WIDTH_CONST_l2(d);
break;
case XED_I_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_DF64_EOSZ_l2:
XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_DF64_EOSZ_l2(d);
break;
case XED_I_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_EOSZ_l2:
XED_LF_SIMMz_IMM_WIDTH_OSZ_NONTERM_EOSZ_l2(d);
break;
case XED_I_LF_UIMM16_IMM_WIDTH_CONST_l2:
XED_LF_UIMM16_IMM_WIDTH_CONST_l2(d);
break;
case XED_I_LF_UIMM8_IMM_WIDTH_CONST_l2:
XED_LF_UIMM8_IMM_WIDTH_CONST_l2(d);
break;
case XED_I_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_EOSZ_l2:
XED_LF_UIMMv_IMM_WIDTH_OSZ_NONTERM_EOSZ_l2(d);
break;
case xed_i_ild_hasimm_map0x0_op0xc8_l1:
xed_ild_hasimm_map0x0_op0xc8_l1(d);
break;
case xed_i_ild_hasimm_map0x0F_op0x78_l1:
xed_ild_hasimm_map0x0F_op0x78_l1(d);
break;
default:
d->op.error = XED_ERROR_GENERAL_ERROR;
return;
}
}
}
privileged static int xed_consume_byte(struct XedDecodedInst *d) {
if (d->length < d->op.max_bytes) {
return d->bytes[d->length++];
} else {
xed_too_short(d);
return -1;
}
}
privileged static void xed_prefix_scanner(struct XedDecodedInst *d) {
xed_bits_t first_f2f3, last_f2f3, seg;
xed_bits_t b, max_bytes, length, nprefixes, nseg_prefixes, nrexes, rex;
seg = 0;
length = d->length;
max_bytes = d->op.max_bytes;
first_f2f3 = last_f2f3 = rex = nrexes = nprefixes = nseg_prefixes = 0;
while (length < max_bytes) {
b = d->bytes[length];
if (xed_get_prefix_table_bit(b) == 0) goto out;
switch (b) {
case 0x66:
d->op.osz = true;
rex = 0;
break;
case 0x67:
d->op.asz = true;
rex = 0;
break;
case 0x2E:
case 0x3E:
xed_set_hint(b, d);
/* fallthrough */
case 0x26:
case 0x36:
if (!xed3_mode_64b(d)) seg = b;
nseg_prefixes++;
rex = 0;
break;
case 0x64:
case 0x65:
seg = b;
nseg_prefixes++;
rex = 0;
break;
case 0xF0:
d->op.lock = true;
rex = 0;
break;
case 0xF3:
d->op.ild_f3 = true;
last_f2f3 = 3;
if (!first_f2f3) {
first_f2f3 = 3;
}
rex = 0;
break;
case 0xF2:
d->op.ild_f2 = true;
last_f2f3 = 2;
if (!first_f2f3) {
first_f2f3 = 2;
}
rex = 0;
break;
default:
if (xed3_mode_64b(d) && (b & 0xf0) == 0x40) {
nrexes++;
rex = b;
break;
} else {
goto out;
}
}
length++;
nprefixes++;
}
out:
d->length = length;
d->op.nprefixes = nprefixes;
d->op.nseg_prefixes = nseg_prefixes;
d->op.nrexes = nrexes;
if (rex) {
d->op.rexw = rex >> 3 & 1;
d->op.rexr = rex >> 2 & 1;
d->op.rexx = rex >> 1 & 1;
d->op.rexb = rex & 1;
d->op.rex = true;
}
if (d->op.mode_first_prefix) {
d->op.rep = first_f2f3;
} else {
d->op.rep = last_f2f3;
}
switch (seg) {
case 0x26: /* ES */
d->op.seg_ovd = 0 + 1;
break;
case 0x2e: /* CS */
d->op.seg_ovd = 1 + 1;
break;
case 0x36: /* SS */
d->op.seg_ovd = 2 + 1;
break;
case 0x3e: /* DS */
d->op.seg_ovd = 3 + 1;
break;
case 0x64: /* FS */
d->op.seg_ovd = 4 + 1;
break;
case 0x65: /* GS */
d->op.seg_ovd = 5 + 1;
break;
default:
break;
}
if (length >= max_bytes) {
xed_too_short(d);
return;
}
}
privileged static void xed_get_next_as_opcode(struct XedDecodedInst *d) {
xed_bits_t b, length;
length = d->length;
if (length < d->op.max_bytes) {
b = d->bytes[length];
d->op.opcode = b;
d->length++;
/* d->op.srm = xed_modrm_rm(b); */
} else {
xed_too_short(d);
}
}
privileged static void xed_catch_invalid_rex_or_legacy_prefixes(
struct XedDecodedInst *d) {
if (xed3_mode_64b(d) && d->op.rex) {
d->op.error = XED_ERROR_BAD_REX_PREFIX;
} else if (d->op.osz || d->op.ild_f3 || d->op.ild_f2) {
d->op.error = XED_ERROR_BAD_LEGACY_PREFIX;
}
}
privileged static void xed_catch_invalid_mode(struct XedDecodedInst *d) {
if (d->op.realmode) {
d->op.error = XED_ERROR_INVALID_MODE;
}
}
privileged static void xed_evex_vex_opcode_scanner(struct XedDecodedInst *d) {
d->op.opcode = d->bytes[d->length];
d->op.pos_opcode = d->length++;
xed_catch_invalid_rex_or_legacy_prefixes(d);
xed_catch_invalid_mode(d);
}
privileged static void xed_opcode_scanner(struct XedDecodedInst *d) {
xed_bits_t b, length;
length = d->length;
if ((b = d->bytes[length]) != 0x0F) {
d->op.map = XED_ILD_MAP0;
d->op.opcode = b;
d->op.pos_opcode = length;
d->length++;
} else {
length++;
d->op.pos_opcode = length;
if (length < d->op.max_bytes) {
switch ((b = d->bytes[length])) {
case 0x38:
length++;
d->op.map = XED_ILD_MAP2;
d->length = length;
xed_get_next_as_opcode(d);
return;
case 0x3A:
length++;
d->op.map = XED_ILD_MAP3;
d->length = length;
d->op.imm_width = xed_bytes2bits(1);
xed_get_next_as_opcode(d);
return;
case 0x3B:
length++;
xed_bad_map(d);
d->length = length;
xed_get_next_as_opcode(d);
return;
case 0x39:
case 0x3C:
case 0x3D:
case 0x3E:
case 0x3F:
length++;
xed_bad_map(d);
d->length = length;
xed_get_next_as_opcode(d);
return;
case 0x0F:
d->op.amd3dnow = true;
length++;
d->op.opcode = 0x0F;
d->op.map = XED_ILD_MAPAMD;
d->length = length;
break;
default:
length++;
d->op.opcode = b;
d->op.map = XED_ILD_MAP1;
d->length = length;
break;
}
} else {
xed_too_short(d);
return;
}
}
/* d->op.srm = xed_modrm_rm(d->op.opcode); */
}
privileged static bool xed_is_bound_instruction(struct XedDecodedInst *d) {
return !xed3_mode_64b(d) && d->length + 1 < d->op.max_bytes &&
(d->bytes[d->length + 1] & 0xC0) != 0xC0;
}
privileged static void xed_evex_scanner(struct XedDecodedInst *d) {
xed_bits_t length, max_bytes;
union XedAvx512Payload1 evex1;
union XedAvx512Payload2 evex2;
union XedAvx512Payload3 evex3;
length = d->length;
max_bytes = d->op.max_bytes;
/* @assume prefix_scanner() checked length */
if (d->bytes[length] != 0x62) return;
if (xed_is_bound_instruction(d)) return;
if (length + 4 < max_bytes) {
evex1.u32 = d->bytes[length + 1];
evex2.u32 = d->bytes[length + 2];
if (xed3_mode_64b(d)) {
d->op.rexr = ~evex1.s.r_inv & 1;
d->op.rexx = ~evex1.s.x_inv & 1;
d->op.rexb = ~evex1.s.b_inv & 1;
d->op.rexrr = ~evex1.s.rr_inv & 1;
}
d->op.rexw = evex2.s.rexw & 1;
d->op.map = evex1.s.map;
d->op.vexdest3 = evex2.s.vexdest3;
d->op.vexdest210 = evex2.s.vexdest210;
d->op.ubit = evex2.s.ubit;
if (evex2.s.ubit) {
d->op.vexvalid = 2;
} else {
d->op.error = XED_ERROR_BAD_EVEX_UBIT;
}
d->op.vex_prefix = kXed.vex_prefix_recoding[evex2.s.pp];
if (evex1.s.map == XED_ILD_MAP3) {
d->op.imm_width = xed_bytes2bits(1);
}
if (evex2.s.ubit) {
evex3.u32 = d->bytes[length + 3];
d->op.zeroing = evex3.s.z;
d->op.llrc = evex3.s.llrc;
d->op.vl = evex3.s.llrc;
d->op.bcrc = evex3.s.bcrc;
d->op.vexdest4 = ~evex3.s.vexdest4p & 1;
if (!xed3_mode_64b(d) && evex3.s.vexdest4p == 0) {
xed_bad_v4(d);
}
d->op.mask = evex3.s.mask;
if (evex3.s.mask == 0 && evex3.s.z == 1) {
xed_bad_z_aaa(d);
}
}
length += 4;
d->length = length;
xed_evex_vex_opcode_scanner(d);
} else {
xed_too_short(d);
}
}
privileged static uint64_t xed_read_number(uint8_t *p, size_t n, bool s) {
switch (s << 2 | bsr(n)) {
case 0b000:
return *p;
case 0b100:
return (int8_t)*p;
case 0b001:
return READ16LE(p);
case 0b101:
return (int16_t)READ16LE(p);
case 0b010:
return READ32LE(p);
case 0b110:
return (int32_t)READ32LE(p);
case 0b011:
case 0b111:
return READ64LE(p);
default:
unreachable;
}
}
privileged static void xed_evex_imm_scanner(struct XedDecodedInst *d) {
uint64_t uimm0;
uint8_t *itext, *imm_ptr;
xed_bits_t length, imm_bytes, imm1_bytes, max_bytes;
imm_ptr = 0;
itext = d->bytes;
xed_set_imm_bytes(d);
length = d->length;
max_bytes = d->op.max_bytes;
if (d->op.amd3dnow) {
if (length < max_bytes) {
d->op.opcode = d->bytes[length];
d->length++;
return;
} else {
xed_too_short(d);
return;
}
}
imm_bytes = xed_bits2bytes(d->op.imm_width);
imm1_bytes = d->op.imm1_bytes;
if (imm_bytes) {
if (length + imm_bytes <= max_bytes) {
d->op.pos_imm = length;
length += imm_bytes;
d->length = length;
if (imm1_bytes) {
if (length + imm1_bytes <= max_bytes) {
d->op.pos_imm1 = length;
imm_ptr = itext + length;
length += imm1_bytes;
d->length = length;
d->op.uimm1 = *imm_ptr;
} else {
xed_too_short(d);
return;
}
}
} else {
xed_too_short(d);
return;
}
}
if (imm_bytes) {
d->op.uimm0 =
xed_read_number(itext + d->op.pos_imm, imm_bytes, d->op.imm_signed);
}
}
privileged static void xed_vex_c4_scanner(struct XedDecodedInst *d) {
uint8_t n;
xed_bits_t length, max_bytes;
union XedAvxC4Payload1 c4byte1;
union XedAvxC4Payload2 c4byte2;
if (xed_is_bound_instruction(d)) return;
length = d->length;
max_bytes = d->op.max_bytes;
length++;
if (length + 2 < max_bytes) {
c4byte1.u32 = d->bytes[length];
c4byte2.u32 = d->bytes[length + 1];
d->op.rexr = ~c4byte1.s.r_inv & 1;
d->op.rexx = ~c4byte1.s.x_inv & 1;
d->op.rexb = (xed3_mode_64b(d) & ~c4byte1.s.b_inv) & 1;
d->op.rexw = c4byte2.s.w & 1;
d->op.vexdest3 = c4byte2.s.v3;
d->op.vexdest210 = c4byte2.s.vvv210;
d->op.vl = c4byte2.s.l;
d->op.vex_prefix = kXed.vex_prefix_recoding[c4byte2.s.pp];
d->op.map = c4byte1.s.map;
if ((c4byte1.s.map & 0x3) == XED_ILD_MAP3) {
d->op.imm_width = xed_bytes2bits(1);
}
d->op.vexvalid = 1;
length += 2;
d->length = length;
xed_evex_vex_opcode_scanner(d);
} else {
d->length = length;
xed_too_short(d);
}
}
privileged static void xed_vex_c5_scanner(struct XedDecodedInst *d) {
xed_bits_t max_bytes, length;
union XedAvxC5Payload c5byte1;
length = d->length;
max_bytes = d->op.max_bytes;
if (xed_is_bound_instruction(d)) return;
length++;
if (length + 1 < max_bytes) {
c5byte1.u32 = d->bytes[length];
d->op.rexr = ~c5byte1.s.r_inv & 1;
d->op.vexdest3 = c5byte1.s.v3;
d->op.vexdest210 = c5byte1.s.vvv210;
d->op.vl = c5byte1.s.l;
d->op.vex_prefix = kXed.vex_prefix_recoding[c5byte1.s.pp];
d->op.map = XED_ILD_MAP1;
d->op.vexvalid = 1;
length++;
d->length = length;
xed_evex_vex_opcode_scanner(d);
} else {
d->length = length;
xed_too_short(d);
}
}
privileged static void xed_vex_scanner(struct XedDecodedInst *d) {
if (!d->op.out_of_bytes) {
switch (d->bytes[d->length]) {
case 0xC5:
xed_vex_c5_scanner(d);
break;
case 0xC4:
xed_vex_c4_scanner(d);
break;
default:
break;
}
}
}
privileged static void xed_bad_ll(struct XedDecodedInst *d) {
d->op.error = XED_ERROR_BAD_EVEX_LL;
}
privileged static void xed_bad_ll_check(struct XedDecodedInst *d) {
if (d->op.llrc == 3) {
if (d->op.mod != 3) {
xed_bad_ll(d);
} else if (d->op.bcrc == 0) {
xed_bad_ll(d);
}
}
}
privileged static void xed_set_has_modrm(struct XedDecodedInst *d) {
if (d->op.map < ARRAYLEN(xed_has_modrm_2d)) {
d->op.has_modrm = xed_has_modrm_2d[d->op.map][d->op.opcode];
} else {
d->op.has_modrm = 1;
}
}
privileged static void xed_modrm_scanner(struct XedDecodedInst *d) {
uint8_t b;
xed_bits_t eamode, mod, rm, asz, mode, length, has_modrm;
xed_set_has_modrm(d);
has_modrm = d->op.has_modrm;
if (has_modrm) {
length = d->length;
if (length < d->op.max_bytes) {
b = d->bytes[length];
d->op.modrm = b;
d->op.pos_modrm = length;
d->length++;
mod = xed_modrm_mod(b);
rm = xed_modrm_rm(b);
d->op.mod = mod;
d->op.rm = rm;
d->op.reg = xed_modrm_reg(b);
xed_bad_ll_check(d);
if (has_modrm != XED_ILD_HASMODRM_IGNORE_MOD) {
asz = d->op.asz;
mode = d->op.mode;
eamode = kXed.eamode[asz][mode];
d->op.disp_width =
xed_bytes2bits(xed_has_disp_regular[eamode][mod][rm]);
d->op.has_sib = xed_has_sib_table[eamode][mod][rm];
}
} else {
xed_too_short(d);
}
}
}
privileged static void xed_sib_scanner(struct XedDecodedInst *d) {
uint8_t b;
xed_bits_t length;
if (d->op.has_sib) {
length = d->length;
if (length < d->op.max_bytes) {
b = d->bytes[length];
d->op.pos_sib = length;
d->op.sib = b;
d->length++;
if (xed_sib_base(b) == 5) {
if (d->op.mod == 0) {
d->op.disp_width = xed_bytes2bits(4);
}
}
} else {
xed_too_short(d);
}
}
}
privileged static void XED_LF_EMPTY_DISP_CONST_l2(struct XedDecodedInst *x) {
/* This function does nothing for map-opcodes whose
* disp_bytes value is set earlier in xed-ild.c
* (regular displacement resolution by modrm/sib)*/
(void)x;
}
privileged static void XED_LF_BRDISP8_BRDISP_WIDTH_CONST_l2(
struct XedDecodedInst *x) {
x->op.disp_width = 0x8;
}
privileged static void XED_LF_BRDISPz_BRDISP_WIDTH_OSZ_NONTERM_EOSZ_l2(
struct XedDecodedInst *x) {
x->op.disp_width =
kXed.BRDISPz_BRDISP_WIDTH[kXed.OSZ_NONTERM_EOSZ[x->op.rexw][x->op.osz]
[x->op.mode]];
x->op.disp_unsigned = true;
}
privileged static void XED_LF_RESOLVE_BYREG_DISP_map0x0_op0xc7_l1(
struct XedDecodedInst *x) {
switch (x->op.reg) {
case 0:
XED_LF_EMPTY_DISP_CONST_l2(x);
break;
case 7:
XED_LF_BRDISPz_BRDISP_WIDTH_OSZ_NONTERM_EOSZ_l2(x);
break;
default:
break;
}
}
privileged static void XED_LF_MEMDISPv_DISP_WIDTH_ASZ_NONTERM_EASZ_l2(
struct XedDecodedInst *x) {
x->op.disp_width =
kXed.MEMDISPv_DISP_WIDTH[kXed.ASZ_NONTERM_EASZ[x->op.asz][x->op.mode]];
x->op.disp_unsigned = true;
}
privileged static void XED_LF_BRDISP32_BRDISP_WIDTH_CONST_l2(
struct XedDecodedInst *x) {
x->op.disp_width = 0x20;
}
privileged static void XED_LF_DISP_BUCKET_0_l1(struct XedDecodedInst *x) {
if (x->op.mode <= XED_MODE_LEGACY) {
XED_LF_BRDISPz_BRDISP_WIDTH_OSZ_NONTERM_EOSZ_l2(x);
x->op.disp_unsigned = false;
} else if (x->op.mode == XED_MODE_LONG) {
XED_LF_BRDISP32_BRDISP_WIDTH_CONST_l2(x);
}
}
privileged static void xed_disp_scanner(struct XedDecodedInst *d) {
xed_bits_t length, disp_width, disp_bytes, max_bytes;
length = d->length;
if (d->op.map < XED_ILD_MAP2) {
switch (xed_disp_bits_2d[d->op.map][d->op.opcode]) {
case XED_I_LF_BRDISP8_BRDISP_WIDTH_CONST_l2:
XED_LF_BRDISP8_BRDISP_WIDTH_CONST_l2(d);
break;
case XED_I_LF_BRDISPz_BRDISP_WIDTH_OSZ_NONTERM_EOSZ_l2:
XED_LF_BRDISPz_BRDISP_WIDTH_OSZ_NONTERM_EOSZ_l2(d);
break;
case XED_I_LF_DISP_BUCKET_0_l1:
XED_LF_DISP_BUCKET_0_l1(d);
break;
case XED_I_LF_EMPTY_DISP_CONST_l2:
XED_LF_EMPTY_DISP_CONST_l2(d);
break;
case XED_I_LF_MEMDISPv_DISP_WIDTH_ASZ_NONTERM_EASZ_l2:
XED_LF_MEMDISPv_DISP_WIDTH_ASZ_NONTERM_EASZ_l2(d);
break;
case XED_I_LF_RESOLVE_BYREG_DISP_map0x0_op0xc7_l1:
XED_LF_RESOLVE_BYREG_DISP_map0x0_op0xc7_l1(d);
break;
default:
d->op.error = XED_ERROR_GENERAL_ERROR;
return;
}
}
disp_bytes = xed_bits2bytes(d->op.disp_width);
if (disp_bytes) {
max_bytes = d->op.max_bytes;
if (length + disp_bytes <= max_bytes) {
d->op.disp =
xed_read_number(d->bytes + length, disp_bytes, !d->op.disp_unsigned);
d->op.pos_disp = length;
d->length = length + disp_bytes;
} else {
xed_too_short(d);
}
}
}
privileged static void xed_decode_instruction_length(
struct XedDecodedInst *ild) {
xed_prefix_scanner(ild);
if (!ild->op.out_of_bytes) {
xed_vex_scanner(ild);
if (!ild->op.out_of_bytes) {
if (!ild->op.vexvalid) xed_evex_scanner(ild);
if (!ild->op.out_of_bytes) {
if (!ild->op.vexvalid && !ild->op.error) {
xed_opcode_scanner(ild);
}
xed_modrm_scanner(ild);
xed_sib_scanner(ild);
xed_disp_scanner(ild);
xed_evex_imm_scanner(ild);
}
}
}
}
privileged static void xed_encode_rde(struct XedDecodedInst *x) {
const uint8_t kWordLog2[2][2][2] = {{{2, 3}, {1, 3}}, {{0, 0}, {0, 0}}};
uint32_t osz = x->op.osz ^ x->op.realmode;
x->op.rde = kWordLog2[~x->op.opcode & 1][osz][x->op.rexw] << 28 |
x->op.mode << 26 | kXed.eamode[x->op.asz][x->op.mode] << 24 |
x->op.rep << 30 | x->op.mod << 22 | x->op.asz << 17 |
x->op.seg_ovd << 18 | x->op.rexw << 6 | osz << 5 |
(x->op.rex << 4 | x->op.rexb << 3 | x->op.srm) << 12 |
(x->op.rex << 4 | x->op.rexb << 3 | x->op.rm) << 7 |
(x->op.rex << 4 | x->op.rexr << 3 | x->op.reg);
}
/**
* Clears instruction decoder state.
*/
privileged struct XedDecodedInst *xed_decoded_inst_zero_set_mode(
struct XedDecodedInst *p, enum XedMachineMode mmode) {
__builtin_memset(p, 0, sizeof(*p));
xed_operands_set_mode(&p->op, mmode);
return p;
}
/**
* Decodes machine instruction length.
*
* This function also decodes other useful attributes, such as the
* offsets of displacement, immediates, etc. It works for all ISAs from
* 1977 to 2020.
*
* @note binary footprint increases ~4kb if this is used
* @see biggest code in gdb/clang/tensorflow binaries
*/
privileged enum XedError xed_instruction_length_decode(
struct XedDecodedInst *xedd, const void *itext, size_t bytes) {
__builtin_memcpy(xedd->bytes, itext, MIN(15, bytes));
xedd->op.max_bytes = MIN(15, bytes);
xed_decode_instruction_length(xedd);
xed_encode_rde(xedd);
if (!xedd->op.out_of_bytes) {
if (xedd->op.map != XED_ILD_MAP_INVALID) {
return xedd->op.error;
} else {
return XED_ERROR_GENERAL_ERROR;
}
} else {
return XED_ERROR_BUFFER_TOO_SHORT;
}
}
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