* Flags that go into the `segment' field of `insn' structures
* during disassembly.
*/
-#define SEG_RELATIVE 1
-#define SEG_32BIT 2
-#define SEG_RMREG 4
-#define SEG_DISP8 8
-#define SEG_DISP16 16
-#define SEG_DISP32 32
-#define SEG_NODISP 64
-#define SEG_SIGNED 128
-#define SEG_64BIT 256
+#define SEG_RELATIVE 1
+#define SEG_32BIT 2
+#define SEG_RMREG 4
+#define SEG_DISP8 8
+#define SEG_DISP16 16
+#define SEG_DISP32 32
+#define SEG_NODISP 64
+#define SEG_SIGNED 128
+#define SEG_64BIT 256
/*
* Prefix information
*/
struct prefix_info {
- uint8_t osize; /* Operand size */
- uint8_t asize; /* Address size */
- uint8_t osp; /* Operand size prefix present */
- uint8_t asp; /* Address size prefix present */
- uint8_t rep; /* Rep prefix present */
- uint8_t seg; /* Segment override prefix present */
- uint8_t wait; /* WAIT "prefix" present */
- uint8_t lock; /* Lock prefix present */
- uint8_t vex[3]; /* VEX prefix present */
- uint8_t vex_c; /* VEX "class" (VEX, XOP, ...) */
- uint8_t vex_m; /* VEX.M field */
+ uint8_t osize; /* Operand size */
+ uint8_t asize; /* Address size */
+ uint8_t osp; /* Operand size prefix present */
+ uint8_t asp; /* Address size prefix present */
+ uint8_t rep; /* Rep prefix present */
+ uint8_t seg; /* Segment override prefix present */
+ uint8_t wait; /* WAIT "prefix" present */
+ uint8_t lock; /* Lock prefix present */
+ uint8_t vex[3]; /* VEX prefix present */
+ uint8_t vex_c; /* VEX "class" (VEX, XOP, ...) */
+ uint8_t vex_m; /* VEX.M field */
uint8_t vex_v;
- uint8_t vex_lp; /* VEX.LP fields */
- uint32_t rex; /* REX prefix present */
+ uint8_t vex_lp; /* VEX.LP fields */
+ uint32_t rex; /* REX prefix present */
};
#define getu8(x) (*(uint8_t *)(x))
};
if (!(regflags & (REGISTER|REGMEM)))
- return 0; /* Registers not permissible?! */
+ return 0; /* Registers not permissible?! */
regflags |= REGISTER;
return 0;
if (!(REG8 & ~regflags)) {
- if (rex & (REX_P|REX_NH))
- return nasm_rd_reg8_rex[regval];
- else
- return nasm_rd_reg8[regval];
+ if (rex & (REX_P|REX_NH))
+ return nasm_rd_reg8_rex[regval];
+ else
+ return nasm_rd_reg8[regval];
}
if (!(REG16 & ~regflags))
return nasm_rd_reg16[regval];
if (!(REG_DREG & ~regflags))
return nasm_rd_dreg[regval];
if (!(REG_TREG & ~regflags)) {
- if (regval > 7)
- return 0; /* TR registers are ill-defined with rex */
+ if (regval > 7)
+ return 0; /* TR registers are ill-defined with rex */
return nasm_rd_treg[regval];
}
if (!(FPUREG & ~regflags))
* Process an effective address (ModRM) specification.
*/
static uint8_t *do_ea(uint8_t *data, int modrm, int asize,
- int segsize, enum ea_type type,
+ int segsize, enum ea_type type,
operand *op, insn *ins)
{
int mod, rm, scale, index, base;
rm = modrm & 07;
if (mod != 3 && asize != 16 && rm == 4)
- sib = *data++;
+ sib = *data++;
rex = ins->rex;
* none, byte or *dword*), while <rm> specifies the base
* register. Again, [EBP] is missing, replaced by a pure
* disp32 (this time that's mod=0,rm=*5*) in 32-bit mode,
- * and RIP-relative addressing in 64-bit mode.
- *
- * However, rm=4
+ * and RIP-relative addressing in 64-bit mode.
+ *
+ * However, rm=4
* indicates not a single base register, but instead the
* presence of a SIB byte...
*/
- int a64 = asize == 64;
+ int a64 = asize == 64;
op->indexreg = -1;
- if (a64)
- op->basereg = nasm_rd_reg64[rm | ((rex & REX_B) ? 8 : 0)];
- else
- op->basereg = nasm_rd_reg32[rm | ((rex & REX_B) ? 8 : 0)];
+ if (a64)
+ op->basereg = nasm_rd_reg64[rm | ((rex & REX_B) ? 8 : 0)];
+ else
+ op->basereg = nasm_rd_reg32[rm | ((rex & REX_B) ? 8 : 0)];
if (rm == 5 && mod == 0) {
- if (segsize == 64) {
- op->eaflags |= EAF_REL;
- op->segment |= SEG_RELATIVE;
- mod = 2; /* fake disp32 */
- }
+ if (segsize == 64) {
+ op->eaflags |= EAF_REL;
+ op->segment |= SEG_RELATIVE;
+ mod = 2; /* fake disp32 */
+ }
- if (asize != 64)
- op->disp_size = asize;
+ if (asize != 64)
+ op->disp_size = asize;
- op->basereg = -1;
- mod = 2; /* fake disp32 */
+ op->basereg = -1;
+ mod = 2; /* fake disp32 */
}
op->scale = 1 << scale;
- if (type == EA_XMMVSIB)
- op->indexreg = nasm_rd_xmmreg[index | ((rex & REX_X) ? 8 : 0)];
- else if (type == EA_YMMVSIB)
- op->indexreg = nasm_rd_ymmreg[index | ((rex & REX_X) ? 8 : 0)];
- else if (type == EA_ZMMVSIB)
- op->indexreg = nasm_rd_zmmreg[index | ((rex & REX_X) ? 8 : 0)];
- else if (index == 4 && !(rex & REX_X))
- op->indexreg = -1; /* ESP/RSP cannot be an index */
+ if (type == EA_XMMVSIB)
+ op->indexreg = nasm_rd_xmmreg[index | ((rex & REX_X) ? 8 : 0)];
+ else if (type == EA_YMMVSIB)
+ op->indexreg = nasm_rd_ymmreg[index | ((rex & REX_X) ? 8 : 0)];
+ else if (type == EA_ZMMVSIB)
+ op->indexreg = nasm_rd_zmmreg[index | ((rex & REX_X) ? 8 : 0)];
+ else if (index == 4 && !(rex & REX_X))
+ op->indexreg = -1; /* ESP/RSP cannot be an index */
else if (a64)
- op->indexreg = nasm_rd_reg64[index | ((rex & REX_X) ? 8 : 0)];
- else
- op->indexreg = nasm_rd_reg32[index | ((rex & REX_X) ? 8 : 0)];
-
- if (base == 5 && mod == 0) {
- op->basereg = -1;
- mod = 2; /* Fake disp32 */
- } else if (a64)
- op->basereg = nasm_rd_reg64[base | ((rex & REX_B) ? 8 : 0)];
- else
- op->basereg = nasm_rd_reg32[base | ((rex & REX_B) ? 8 : 0)];
-
- if (segsize == 16)
- op->disp_size = 32;
+ op->indexreg = nasm_rd_reg64[index | ((rex & REX_X) ? 8 : 0)];
+ else
+ op->indexreg = nasm_rd_reg32[index | ((rex & REX_X) ? 8 : 0)];
+
+ if (base == 5 && mod == 0) {
+ op->basereg = -1;
+ mod = 2; /* Fake disp32 */
+ } else if (a64)
+ op->basereg = nasm_rd_reg64[base | ((rex & REX_B) ? 8 : 0)];
+ else
+ op->basereg = nasm_rd_reg32[base | ((rex & REX_B) ? 8 : 0)];
+
+ if (segsize == 16)
+ op->disp_size = 32;
} else if (type != EA_SCALAR) {
/* Can't have VSIB without SIB */
return NULL;
case 1:
op->segment |= SEG_DISP8;
op->offset = gets8(data);
- data++;
+ data++;
break;
case 2:
op->segment |= SEG_DISP32;
op->offset = gets32(data);
- data += 4;
+ data += 4;
break;
}
return data;
#define case4(x) case (x): case (x)+1: case (x)+2: case (x)+3
static int matches(const struct itemplate *t, uint8_t *data,
- const struct prefix_info *prefix, int segsize, insn *ins)
+ const struct prefix_info *prefix, int segsize, insn *ins)
{
uint8_t *r = (uint8_t *)(t->code);
uint8_t *origdata = data;
enum ea_type eat = EA_SCALAR;
for (i = 0; i < MAX_OPERANDS; i++) {
- ins->oprs[i].segment = ins->oprs[i].disp_size =
- (segsize == 64 ? SEG_64BIT : segsize == 32 ? SEG_32BIT : 0);
+ ins->oprs[i].segment = ins->oprs[i].disp_size =
+ (segsize == 64 ? SEG_64BIT : segsize == 32 ? SEG_32BIT : 0);
}
ins->condition = -1;
ins->rex = prefix->rex;
dwait = prefix->wait ? P_WAIT : 0;
while ((c = *r++) != 0) {
- op1 = (c & 3) + ((opex & 1) << 2);
- op2 = ((c >> 3) & 3) + ((opex & 2) << 1);
- opx = &ins->oprs[op1];
- opy = &ins->oprs[op2];
- opex = 0;
-
- switch (c) {
- case 01:
- case 02:
- case 03:
- case 04:
+ op1 = (c & 3) + ((opex & 1) << 2);
+ op2 = ((c >> 3) & 3) + ((opex & 2) << 1);
+ opx = &ins->oprs[op1];
+ opy = &ins->oprs[op2];
+ opex = 0;
+
+ switch (c) {
+ case 01:
+ case 02:
+ case 03:
+ case 04:
while (c--)
if (*r++ != *data++)
return false;
- break;
+ break;
- case 05:
- case 06:
- case 07:
- opex = c;
- break;
+ case 05:
+ case 06:
+ case 07:
+ opex = c;
+ break;
- case4(010):
- {
+ case4(010):
+ {
int t = *r++, d = *data++;
if (d < t || d > t + 7)
return false;
else {
opx->basereg = (d-t)+
- (ins->rex & REX_B ? 8 : 0);
+ (ins->rex & REX_B ? 8 : 0);
opx->segment |= SEG_RMREG;
}
- break;
- }
+ break;
+ }
- case4(0274):
+ case4(0274):
opx->offset = (int8_t)*data++;
opx->segment |= SEG_SIGNED;
- break;
+ break;
- case4(020):
+ case4(020):
opx->offset = *data++;
- break;
+ break;
- case4(024):
+ case4(024):
opx->offset = *data++;
- break;
+ break;
- case4(030):
+ case4(030):
opx->offset = getu16(data);
- data += 2;
- break;
-
- case4(034):
- if (osize == 32) {
- opx->offset = getu32(data);
- data += 4;
- } else {
- opx->offset = getu16(data);
- data += 2;
- }
+ data += 2;
+ break;
+
+ case4(034):
+ if (osize == 32) {
+ opx->offset = getu32(data);
+ data += 4;
+ } else {
+ opx->offset = getu16(data);
+ data += 2;
+ }
if (segsize != asize)
opx->disp_size = asize;
- break;
+ break;
- case4(040):
+ case4(040):
opx->offset = getu32(data);
- data += 4;
- break;
+ data += 4;
+ break;
case4(0254):
opx->offset = gets32(data);
data += 4;
break;
- case4(044):
- switch (asize) {
- case 16:
- opx->offset = getu16(data);
- data += 2;
- if (segsize != 16)
- opx->disp_size = 16;
- break;
- case 32:
- opx->offset = getu32(data);
- data += 4;
- if (segsize == 16)
- opx->disp_size = 32;
- break;
- case 64:
- opx->offset = getu64(data);
- opx->disp_size = 64;
- data += 8;
- break;
- }
- break;
-
- case4(050):
+ case4(044):
+ switch (asize) {
+ case 16:
+ opx->offset = getu16(data);
+ data += 2;
+ if (segsize != 16)
+ opx->disp_size = 16;
+ break;
+ case 32:
+ opx->offset = getu32(data);
+ data += 4;
+ if (segsize == 16)
+ opx->disp_size = 32;
+ break;
+ case 64:
+ opx->offset = getu64(data);
+ opx->disp_size = 64;
+ data += 8;
+ break;
+ }
+ break;
+
+ case4(050):
opx->offset = gets8(data++);
opx->segment |= SEG_RELATIVE;
- break;
+ break;
- case4(054):
- opx->offset = getu64(data);
- data += 8;
- break;
+ case4(054):
+ opx->offset = getu64(data);
+ data += 8;
+ break;
- case4(060):
+ case4(060):
opx->offset = gets16(data);
- data += 2;
+ data += 2;
opx->segment |= SEG_RELATIVE;
opx->segment &= ~SEG_32BIT;
- break;
+ break;
- case4(064): /* rel */
+ case4(064): /* rel */
opx->segment |= SEG_RELATIVE;
/* In long mode rel is always 32 bits, sign extended. */
if (segsize == 64 || osize == 32) {
opx->segment &= ~SEG_32BIT;
opx->type = (opx->type & ~SIZE_MASK) | BITS16;
}
- break;
+ break;
- case4(070):
+ case4(070):
opx->offset = gets32(data);
- data += 4;
+ data += 4;
opx->segment |= SEG_32BIT | SEG_RELATIVE;
- break;
-
- case4(0100):
- case4(0110):
- case4(0120):
- case4(0130):
- {
- int modrm = *data++;
+ break;
+
+ case4(0100):
+ case4(0110):
+ case4(0120):
+ case4(0130):
+ {
+ int modrm = *data++;
opx->segment |= SEG_RMREG;
data = do_ea(data, modrm, asize, segsize, eat, opy, ins);
- if (!data)
- return false;
+ if (!data)
+ return false;
opx->basereg = ((modrm >> 3) & 7) + (ins->rex & REX_R ? 8 : 0);
- break;
- }
-
- case 0172:
- {
- uint8_t ximm = *data++;
- c = *r++;
- ins->oprs[c >> 3].basereg = (ximm >> 4) & regmask;
- ins->oprs[c >> 3].segment |= SEG_RMREG;
- ins->oprs[c & 7].offset = ximm & 15;
- }
- break;
-
- case 0173:
- {
- uint8_t ximm = *data++;
- c = *r++;
-
- if ((c ^ ximm) & 15)
- return false;
-
- ins->oprs[c >> 4].basereg = (ximm >> 4) & regmask;
- ins->oprs[c >> 4].segment |= SEG_RMREG;
- }
- break;
-
- case4(0174):
- {
- uint8_t ximm = *data++;
-
- opx->basereg = (ximm >> 4) & regmask;
- opx->segment |= SEG_RMREG;
- }
- break;
-
- case4(0200):
- case4(0204):
- case4(0210):
- case4(0214):
- case4(0220):
- case4(0224):
- case4(0230):
- case4(0234):
- {
+ break;
+ }
+
+ case 0172:
+ {
+ uint8_t ximm = *data++;
+ c = *r++;
+ ins->oprs[c >> 3].basereg = (ximm >> 4) & regmask;
+ ins->oprs[c >> 3].segment |= SEG_RMREG;
+ ins->oprs[c & 7].offset = ximm & 15;
+ }
+ break;
+
+ case 0173:
+ {
+ uint8_t ximm = *data++;
+ c = *r++;
+
+ if ((c ^ ximm) & 15)
+ return false;
+
+ ins->oprs[c >> 4].basereg = (ximm >> 4) & regmask;
+ ins->oprs[c >> 4].segment |= SEG_RMREG;
+ }
+ break;
+
+ case4(0174):
+ {
+ uint8_t ximm = *data++;
+
+ opx->basereg = (ximm >> 4) & regmask;
+ opx->segment |= SEG_RMREG;
+ }
+ break;
+
+ case4(0200):
+ case4(0204):
+ case4(0210):
+ case4(0214):
+ case4(0220):
+ case4(0224):
+ case4(0230):
+ case4(0234):
+ {
int modrm = *data++;
if (((modrm >> 3) & 07) != (c & 07))
return false; /* spare field doesn't match up */
data = do_ea(data, modrm, asize, segsize, eat, opy, ins);
- if (!data)
- return false;
- break;
- }
-
- case4(0260):
- case 0270:
- {
- int vexm = *r++;
- int vexwlp = *r++;
-
- ins->rex |= REX_V;
- if ((prefix->rex & (REX_V|REX_P)) != REX_V)
- return false;
-
- if ((vexm & 0x1f) != prefix->vex_m)
- return false;
-
- switch (vexwlp & 060) {
- case 000:
- if (prefix->rex & REX_W)
- return false;
- break;
- case 020:
- if (!(prefix->rex & REX_W))
- return false;
- ins->rex &= ~REX_W;
- break;
- case 040: /* VEX.W is a don't care */
- ins->rex &= ~REX_W;
- break;
- case 060:
- break;
- }
-
- /* The 010 bit of vexwlp is set if VEX.L is ignored */
- if ((vexwlp ^ prefix->vex_lp) & ((vexwlp & 010) ? 03 : 07))
- return false;
-
- if (c == 0270) {
- if (prefix->vex_v != 0)
- return false;
- } else {
- opx->segment |= SEG_RMREG;
- opx->basereg = prefix->vex_v;
- }
- vex_ok = true;
- break;
- }
+ if (!data)
+ return false;
+ break;
+ }
+
+ case4(0260):
+ case 0270:
+ {
+ int vexm = *r++;
+ int vexwlp = *r++;
+
+ ins->rex |= REX_V;
+ if ((prefix->rex & (REX_V|REX_P)) != REX_V)
+ return false;
+
+ if ((vexm & 0x1f) != prefix->vex_m)
+ return false;
+
+ switch (vexwlp & 060) {
+ case 000:
+ if (prefix->rex & REX_W)
+ return false;
+ break;
+ case 020:
+ if (!(prefix->rex & REX_W))
+ return false;
+ ins->rex &= ~REX_W;
+ break;
+ case 040: /* VEX.W is a don't care */
+ ins->rex &= ~REX_W;
+ break;
+ case 060:
+ break;
+ }
+
+ /* The 010 bit of vexwlp is set if VEX.L is ignored */
+ if ((vexwlp ^ prefix->vex_lp) & ((vexwlp & 010) ? 03 : 07))
+ return false;
+
+ if (c == 0270) {
+ if (prefix->vex_v != 0)
+ return false;
+ } else {
+ opx->segment |= SEG_RMREG;
+ opx->basereg = prefix->vex_v;
+ }
+ vex_ok = true;
+ break;
+ }
case 0271:
if (prefix->rep == 0xF3)
}
break;
- case 0310:
+ case 0310:
if (asize != 16)
return false;
else
a_used = true;
- break;
+ break;
- case 0311:
+ case 0311:
if (asize != 32)
return false;
else
a_used = true;
- break;
+ break;
- case 0312:
+ case 0312:
if (asize != segsize)
return false;
else
a_used = true;
- break;
-
- case 0313:
- if (asize != 64)
- return false;
- else
- a_used = true;
- break;
-
- case 0314:
- if (prefix->rex & REX_B)
- return false;
- break;
-
- case 0315:
- if (prefix->rex & REX_X)
- return false;
- break;
-
- case 0316:
- if (prefix->rex & REX_R)
- return false;
- break;
-
- case 0317:
- if (prefix->rex & REX_W)
- return false;
- break;
-
- case 0320:
+ break;
+
+ case 0313:
+ if (asize != 64)
+ return false;
+ else
+ a_used = true;
+ break;
+
+ case 0314:
+ if (prefix->rex & REX_B)
+ return false;
+ break;
+
+ case 0315:
+ if (prefix->rex & REX_X)
+ return false;
+ break;
+
+ case 0316:
+ if (prefix->rex & REX_R)
+ return false;
+ break;
+
+ case 0317:
+ if (prefix->rex & REX_W)
+ return false;
+ break;
+
+ case 0320:
if (osize != 16)
return false;
else
o_used = true;
- break;
+ break;
- case 0321:
+ case 0321:
if (osize != 32)
return false;
else
o_used = true;
- break;
+ break;
- case 0322:
+ case 0322:
if (osize != (segsize == 16) ? 16 : 32)
return false;
else
o_used = true;
- break;
-
- case 0323:
- ins->rex |= REX_W; /* 64-bit only instruction */
- osize = 64;
- o_used = true;
- break;
-
- case 0324:
- if (osize != 64)
- return false;
- o_used = true;
- break;
-
- case 0325:
- ins->rex |= REX_NH;
- break;
-
- case 0330:
- {
+ break;
+
+ case 0323:
+ ins->rex |= REX_W; /* 64-bit only instruction */
+ osize = 64;
+ o_used = true;
+ break;
+
+ case 0324:
+ if (osize != 64)
+ return false;
+ o_used = true;
+ break;
+
+ case 0325:
+ ins->rex |= REX_NH;
+ break;
+
+ case 0330:
+ {
int t = *r++, d = *data++;
if (d < t || d > t + 15)
return false;
else
ins->condition = d - t;
- break;
- }
+ break;
+ }
case 0326:
if (prefix->rep == 0xF3)
return false;
break;
- case 0331:
+ case 0331:
if (prefix->rep)
return false;
- break;
+ break;
- case 0332:
- if (prefix->rep != 0xF2)
- return false;
- drep = 0;
- break;
+ case 0332:
+ if (prefix->rep != 0xF2)
+ return false;
+ drep = 0;
+ break;
- case 0333:
+ case 0333:
if (prefix->rep != 0xF3)
return false;
drep = 0;
- break;
+ break;
- case 0334:
- if (lock) {
- ins->rex |= REX_R;
- lock = 0;
- }
- break;
+ case 0334:
+ if (lock) {
+ ins->rex |= REX_R;
+ lock = 0;
+ }
+ break;
- case 0335:
+ case 0335:
if (drep == P_REP)
drep = P_REPE;
- break;
-
- case 0336:
- case 0337:
- break;
-
- case 0340:
- return false;
-
- case 0341:
- if (prefix->wait != 0x9B)
- return false;
- dwait = 0;
- break;
-
- case 0360:
- if (prefix->osp || prefix->rep)
- return false;
- break;
-
- case 0361:
- if (!prefix->osp || prefix->rep)
- return false;
- o_used = true;
- break;
-
- case 0364:
- if (prefix->osp)
- return false;
- break;
-
- case 0365:
- if (prefix->asp)
- return false;
- break;
-
- case 0366:
- if (!prefix->osp)
- return false;
- o_used = true;
- break;
-
- case 0367:
- if (!prefix->asp)
- return false;
- a_used = true;
- break;
+ break;
+
+ case 0336:
+ case 0337:
+ break;
+
+ case 0340:
+ return false;
+
+ case 0341:
+ if (prefix->wait != 0x9B)
+ return false;
+ dwait = 0;
+ break;
+
+ case 0360:
+ if (prefix->osp || prefix->rep)
+ return false;
+ break;
+
+ case 0361:
+ if (!prefix->osp || prefix->rep)
+ return false;
+ o_used = true;
+ break;
+
+ case 0364:
+ if (prefix->osp)
+ return false;
+ break;
+
+ case 0365:
+ if (prefix->asp)
+ return false;
+ break;
+
+ case 0366:
+ if (!prefix->osp)
+ return false;
+ o_used = true;
+ break;
+
+ case 0367:
+ if (!prefix->asp)
+ return false;
+ a_used = true;
+ break;
case 0370:
case 0371:
eat = EA_ZMMVSIB;
break;
- default:
- return false; /* Unknown code */
- }
+ default:
+ return false; /* Unknown code */
+ }
}
if (!vex_ok && (ins->rex & REX_V))
- return false;
+ return false;
/* REX cannot be combined with VEX */
if ((ins->rex & REX_V) && (prefix->rex & REX_P))
- return false;
+ return false;
/*
* Check for unused rep or a/o prefixes.
*/
for (i = 0; i < t->operands; i++) {
- if (ins->oprs[i].segment != SEG_RMREG)
- a_used = true;
+ if (ins->oprs[i].segment != SEG_RMREG)
+ a_used = true;
}
if (lock) {
- if (ins->prefixes[PPS_LOCK])
- return false;
- ins->prefixes[PPS_LOCK] = P_LOCK;
+ if (ins->prefixes[PPS_LOCK])
+ return false;
+ ins->prefixes[PPS_LOCK] = P_LOCK;
}
if (drep) {
- if (ins->prefixes[PPS_REP])
- return false;
+ if (ins->prefixes[PPS_REP])
+ return false;
ins->prefixes[PPS_REP] = drep;
}
ins->prefixes[PPS_WAIT] = dwait;
if (!o_used) {
- if (osize != ((segsize == 16) ? 16 : 32)) {
- enum prefixes pfx = 0;
-
- switch (osize) {
- case 16:
- pfx = P_O16;
- break;
- case 32:
- pfx = P_O32;
- break;
- case 64:
- pfx = P_O64;
- break;
- }
-
- if (ins->prefixes[PPS_OSIZE])
- return false;
- ins->prefixes[PPS_OSIZE] = pfx;
- }
+ if (osize != ((segsize == 16) ? 16 : 32)) {
+ enum prefixes pfx = 0;
+
+ switch (osize) {
+ case 16:
+ pfx = P_O16;
+ break;
+ case 32:
+ pfx = P_O32;
+ break;
+ case 64:
+ pfx = P_O64;
+ break;
+ }
+
+ if (ins->prefixes[PPS_OSIZE])
+ return false;
+ ins->prefixes[PPS_OSIZE] = pfx;
+ }
}
if (!a_used && asize != segsize) {
- if (ins->prefixes[PPS_ASIZE])
- return false;
+ if (ins->prefixes[PPS_ASIZE])
+ return false;
ins->prefixes[PPS_ASIZE] = asize == 16 ? P_A16 : P_A32;
}
};
int32_t disasm(uint8_t *data, char *output, int outbufsize, int segsize,
- int32_t offset, int autosync, iflags_t prefer)
+ int32_t offset, int autosync, iflags_t prefer)
{
const struct itemplate * const *p, * const *best_p;
const struct disasm_index *ix;
end_prefix = false;
while (!end_prefix) {
- switch (*data) {
- case 0xF2:
- case 0xF3:
+ switch (*data) {
+ case 0xF2:
+ case 0xF3:
prefix.rep = *data++;
- break;
+ break;
- case 0x9B:
- prefix.wait = *data++;
- break;
+ case 0x9B:
+ prefix.wait = *data++;
+ break;
- case 0xF0:
+ case 0xF0:
prefix.lock = *data++;
- break;
-
- case 0x2E:
- segover = "cs", prefix.seg = *data++;
- break;
- case 0x36:
- segover = "ss", prefix.seg = *data++;
- break;
- case 0x3E:
- segover = "ds", prefix.seg = *data++;
- break;
- case 0x26:
- segover = "es", prefix.seg = *data++;
- break;
- case 0x64:
- segover = "fs", prefix.seg = *data++;
- break;
- case 0x65:
- segover = "gs", prefix.seg = *data++;
- break;
-
- case 0x66:
- prefix.osize = (segsize == 16) ? 32 : 16;
- prefix.osp = *data++;
- break;
- case 0x67:
- prefix.asize = (segsize == 32) ? 16 : 32;
- prefix.asp = *data++;
- break;
-
- case 0xC4:
- case 0xC5:
- if (segsize == 64 || (data[1] & 0xc0) == 0xc0) {
- prefix.vex[0] = *data++;
- prefix.vex[1] = *data++;
-
- prefix.rex = REX_V;
- prefix.vex_c = RV_VEX;
-
- if (prefix.vex[0] == 0xc4) {
- prefix.vex[2] = *data++;
- prefix.rex |= (~prefix.vex[1] >> 5) & 7; /* REX_RXB */
- prefix.rex |= (prefix.vex[2] >> (7-3)) & REX_W;
- prefix.vex_m = prefix.vex[1] & 0x1f;
- prefix.vex_v = (~prefix.vex[2] >> 3) & 15;
- prefix.vex_lp = prefix.vex[2] & 7;
- } else {
- prefix.rex |= (~prefix.vex[1] >> (7-2)) & REX_R;
- prefix.vex_m = 1;
- prefix.vex_v = (~prefix.vex[1] >> 3) & 15;
- prefix.vex_lp = prefix.vex[1] & 7;
- }
-
- ix = itable_vex[RV_VEX][prefix.vex_m][prefix.vex_lp & 3];
- }
- end_prefix = true;
- break;
-
- case 0x8F:
- if ((data[1] & 030) != 0 &&
- (segsize == 64 || (data[1] & 0xc0) == 0xc0)) {
- prefix.vex[0] = *data++;
- prefix.vex[1] = *data++;
- prefix.vex[2] = *data++;
-
- prefix.rex = REX_V;
- prefix.vex_c = RV_XOP;
-
- prefix.rex |= (~prefix.vex[1] >> 5) & 7; /* REX_RXB */
- prefix.rex |= (prefix.vex[2] >> (7-3)) & REX_W;
- prefix.vex_m = prefix.vex[1] & 0x1f;
- prefix.vex_v = (~prefix.vex[2] >> 3) & 15;
- prefix.vex_lp = prefix.vex[2] & 7;
-
- ix = itable_vex[RV_XOP][prefix.vex_m][prefix.vex_lp & 3];
- }
- end_prefix = true;
- break;
-
- case REX_P + 0x0:
- case REX_P + 0x1:
- case REX_P + 0x2:
- case REX_P + 0x3:
- case REX_P + 0x4:
- case REX_P + 0x5:
- case REX_P + 0x6:
- case REX_P + 0x7:
- case REX_P + 0x8:
- case REX_P + 0x9:
- case REX_P + 0xA:
- case REX_P + 0xB:
- case REX_P + 0xC:
- case REX_P + 0xD:
- case REX_P + 0xE:
- case REX_P + 0xF:
- if (segsize == 64) {
- prefix.rex = *data++;
- if (prefix.rex & REX_W)
- prefix.osize = 64;
- }
- end_prefix = true;
- break;
-
- default:
- end_prefix = true;
- break;
- }
+ break;
+
+ case 0x2E:
+ segover = "cs", prefix.seg = *data++;
+ break;
+ case 0x36:
+ segover = "ss", prefix.seg = *data++;
+ break;
+ case 0x3E:
+ segover = "ds", prefix.seg = *data++;
+ break;
+ case 0x26:
+ segover = "es", prefix.seg = *data++;
+ break;
+ case 0x64:
+ segover = "fs", prefix.seg = *data++;
+ break;
+ case 0x65:
+ segover = "gs", prefix.seg = *data++;
+ break;
+
+ case 0x66:
+ prefix.osize = (segsize == 16) ? 32 : 16;
+ prefix.osp = *data++;
+ break;
+ case 0x67:
+ prefix.asize = (segsize == 32) ? 16 : 32;
+ prefix.asp = *data++;
+ break;
+
+ case 0xC4:
+ case 0xC5:
+ if (segsize == 64 || (data[1] & 0xc0) == 0xc0) {
+ prefix.vex[0] = *data++;
+ prefix.vex[1] = *data++;
+
+ prefix.rex = REX_V;
+ prefix.vex_c = RV_VEX;
+
+ if (prefix.vex[0] == 0xc4) {
+ prefix.vex[2] = *data++;
+ prefix.rex |= (~prefix.vex[1] >> 5) & 7; /* REX_RXB */
+ prefix.rex |= (prefix.vex[2] >> (7-3)) & REX_W;
+ prefix.vex_m = prefix.vex[1] & 0x1f;
+ prefix.vex_v = (~prefix.vex[2] >> 3) & 15;
+ prefix.vex_lp = prefix.vex[2] & 7;
+ } else {
+ prefix.rex |= (~prefix.vex[1] >> (7-2)) & REX_R;
+ prefix.vex_m = 1;
+ prefix.vex_v = (~prefix.vex[1] >> 3) & 15;
+ prefix.vex_lp = prefix.vex[1] & 7;
+ }
+
+ ix = itable_vex[RV_VEX][prefix.vex_m][prefix.vex_lp & 3];
+ }
+ end_prefix = true;
+ break;
+
+ case 0x8F:
+ if ((data[1] & 030) != 0 &&
+ (segsize == 64 || (data[1] & 0xc0) == 0xc0)) {
+ prefix.vex[0] = *data++;
+ prefix.vex[1] = *data++;
+ prefix.vex[2] = *data++;
+
+ prefix.rex = REX_V;
+ prefix.vex_c = RV_XOP;
+
+ prefix.rex |= (~prefix.vex[1] >> 5) & 7; /* REX_RXB */
+ prefix.rex |= (prefix.vex[2] >> (7-3)) & REX_W;
+ prefix.vex_m = prefix.vex[1] & 0x1f;
+ prefix.vex_v = (~prefix.vex[2] >> 3) & 15;
+ prefix.vex_lp = prefix.vex[2] & 7;
+
+ ix = itable_vex[RV_XOP][prefix.vex_m][prefix.vex_lp & 3];
+ }
+ end_prefix = true;
+ break;
+
+ case REX_P + 0x0:
+ case REX_P + 0x1:
+ case REX_P + 0x2:
+ case REX_P + 0x3:
+ case REX_P + 0x4:
+ case REX_P + 0x5:
+ case REX_P + 0x6:
+ case REX_P + 0x7:
+ case REX_P + 0x8:
+ case REX_P + 0x9:
+ case REX_P + 0xA:
+ case REX_P + 0xB:
+ case REX_P + 0xC:
+ case REX_P + 0xD:
+ case REX_P + 0xE:
+ case REX_P + 0xF:
+ if (segsize == 64) {
+ prefix.rex = *data++;
+ if (prefix.rex & REX_W)
+ prefix.osize = 64;
+ }
+ end_prefix = true;
+ break;
+
+ default:
+ end_prefix = true;
+ break;
+ }
}
- best = -1; /* Worst possible */
+ best = -1; /* Worst possible */
best_p = NULL;
best_pref = INT_MAX;
if (!ix)
- return 0; /* No instruction table at all... */
+ return 0; /* No instruction table at all... */
dp = data;
ix += *dp++;
while (ix->n == -1) {
- ix = (const struct disasm_index *)ix->p + *dp++;
+ ix = (const struct disasm_index *)ix->p + *dp++;
}
p = (const struct itemplate * const *)ix->p;
works = true;
/*
* Final check to make sure the types of r/m match up.
- * XXX: Need to make sure this is actually correct.
+ * XXX: Need to make sure this is actually correct.
*/
for (i = 0; i < (*p)->operands; i++) {
if (
- /* If it's a mem-only EA but we have a
- register, die. */
- ((tmp_ins.oprs[i].segment & SEG_RMREG) &&
- is_class(MEMORY, (*p)->opd[i])) ||
- /* If it's a reg-only EA but we have a memory
- ref, die. */
- (!(tmp_ins.oprs[i].segment & SEG_RMREG) &&
- !(REG_EA & ~(*p)->opd[i]) &&
- !((*p)->opd[i] & REG_SMASK)) ||
- /* Register type mismatch (eg FS vs REG_DESS):
- die. */
- ((((*p)->opd[i] & (REGISTER | FPUREG)) ||
- (tmp_ins.oprs[i].segment & SEG_RMREG)) &&
- !whichreg((*p)->opd[i],
- tmp_ins.oprs[i].basereg, tmp_ins.rex))
- ) {
+ /* If it's a mem-only EA but we have a
+ register, die. */
+ ((tmp_ins.oprs[i].segment & SEG_RMREG) &&
+ is_class(MEMORY, (*p)->opd[i])) ||
+ /* If it's a reg-only EA but we have a memory
+ ref, die. */
+ (!(tmp_ins.oprs[i].segment & SEG_RMREG) &&
+ !(REG_EA & ~(*p)->opd[i]) &&
+ !((*p)->opd[i] & REG_SMASK)) ||
+ /* Register type mismatch (eg FS vs REG_DESS):
+ die. */
+ ((((*p)->opd[i] & (REGISTER | FPUREG)) ||
+ (tmp_ins.oprs[i].segment & SEG_RMREG)) &&
+ !whichreg((*p)->opd[i],
+ tmp_ins.oprs[i].basereg, tmp_ins.rex))
+ ) {
works = false;
break;
}
}
- /*
- * Note: we always prefer instructions which incorporate
- * prefixes in the instructions themselves. This is to allow
- * e.g. PAUSE to be preferred to REP NOP, and deal with
- * MMX/SSE instructions where prefixes are used to select
- * between MMX and SSE register sets or outright opcode
- * selection.
- */
+ /*
+ * Note: we always prefer instructions which incorporate
+ * prefixes in the instructions themselves. This is to allow
+ * e.g. PAUSE to be preferred to REP NOP, and deal with
+ * MMX/SSE instructions where prefixes are used to select
+ * between MMX and SSE register sets or outright opcode
+ * selection.
+ */
if (works) {
- int i, nprefix;
+ int i, nprefix;
goodness = ((*p)->flags & IF_PFMASK) ^ prefer;
- nprefix = 0;
- for (i = 0; i < MAXPREFIX; i++)
- if (tmp_ins.prefixes[i])
- nprefix++;
+ nprefix = 0;
+ for (i = 0; i < MAXPREFIX; i++)
+ if (tmp_ins.prefixes[i])
+ nprefix++;
if (nprefix < best_pref ||
- (nprefix == best_pref && goodness < best)) {
+ (nprefix == best_pref && goodness < best)) {
/* This is the best one found so far */
best = goodness;
best_p = p;
- best_pref = nprefix;
+ best_pref = nprefix;
best_length = length;
ins = tmp_ins;
}
* be used for that purpose.
*/
for (i = 0; i < MAXPREFIX; i++) {
- const char *prefix = prefix_name(ins.prefixes[i]);
- if (prefix)
- slen += snprintf(output+slen, outbufsize-slen, "%s ", prefix);
+ const char *prefix = prefix_name(ins.prefixes[i]);
+ if (prefix)
+ slen += snprintf(output+slen, outbufsize-slen, "%s ", prefix);
}
i = (*p)->opcode;
if (i >= FIRST_COND_OPCODE)
- slen += snprintf(output + slen, outbufsize - slen, "%s%s",
- nasm_insn_names[i], condition_name[ins.condition]);
+ slen += snprintf(output + slen, outbufsize - slen, "%s%s",
+ nasm_insn_names[i], condition_name[ins.condition]);
else
slen += snprintf(output + slen, outbufsize - slen, "%s",
- nasm_insn_names[i]);
+ nasm_insn_names[i]);
colon = false;
length += data - origdata; /* fix up for prefixes */
for (i = 0; i < (*p)->operands; i++) {
- opflags_t t = (*p)->opd[i];
- const operand *o = &ins.oprs[i];
- int64_t offs;
+ opflags_t t = (*p)->opd[i];
+ const operand *o = &ins.oprs[i];
+ int64_t offs;
output[slen++] = (colon ? ':' : i == 0 ? ' ' : ',');
- offs = o->offset;
+ offs = o->offset;
if (o->segment & SEG_RELATIVE) {
offs += offset + length;
/*
* sort out wraparound
*/
if (!(o->segment & (SEG_32BIT|SEG_64BIT)))
- offs &= 0xffff;
- else if (segsize != 64)
- offs &= 0xffffffff;
+ offs &= 0xffff;
+ else if (segsize != 64)
+ offs &= 0xffffffff;
/*
* add sync marker, if autosync is on
colon = false;
if ((t & (REGISTER | FPUREG)) ||
- (o->segment & SEG_RMREG)) {
- enum reg_enum reg;
+ (o->segment & SEG_RMREG)) {
+ enum reg_enum reg;
reg = whichreg(t, o->basereg, ins.rex);
if (t & TO)
slen += snprintf(output + slen, outbufsize - slen, "to ");
slen += snprintf(output + slen, outbufsize - slen, "%s",
- nasm_reg_names[reg-EXPR_REG_START]);
+ nasm_reg_names[reg-EXPR_REG_START]);
} else if (!(UNITY & ~t)) {
output[slen++] = '1';
} else if (t & IMMEDIATE) {
}
slen +=
snprintf(output + slen, outbufsize - slen, "0x%"PRIx64"",
- offs);
+ offs);
} else if (!(MEM_OFFS & ~t)) {
slen +=
snprintf(output + slen, outbufsize - slen,
- "[%s%s%s0x%"PRIx64"]",
- (segover ? segover : ""),
- (segover ? ":" : ""),
- (o->disp_size == 64 ? "qword " :
- o->disp_size == 32 ? "dword " :
- o->disp_size == 16 ? "word " : ""), offs);
+ "[%s%s%s0x%"PRIx64"]",
+ (segover ? segover : ""),
+ (segover ? ":" : ""),
+ (o->disp_size == 64 ? "qword " :
+ o->disp_size == 32 ? "dword " :
+ o->disp_size == 16 ? "word " : ""), offs);
segover = NULL;
} else if (is_class(REGMEM, t)) {
int started = false;
output[slen++] = '[';
if (o->disp_size)
slen += snprintf(output + slen, outbufsize - slen, "%s",
- (o->disp_size == 64 ? "qword " :
- o->disp_size == 32 ? "dword " :
- o->disp_size == 16 ? "word " :
- ""));
- if (o->eaflags & EAF_REL)
- slen += snprintf(output + slen, outbufsize - slen, "rel ");
+ (o->disp_size == 64 ? "qword " :
+ o->disp_size == 32 ? "dword " :
+ o->disp_size == 16 ? "word " :
+ ""));
+ if (o->eaflags & EAF_REL)
+ slen += snprintf(output + slen, outbufsize - slen, "rel ");
if (segover) {
slen +=
snprintf(output + slen, outbufsize - slen, "%s:",
- segover);
+ segover);
segover = NULL;
}
if (o->basereg != -1) {
slen += snprintf(output + slen, outbufsize - slen, "%s",
- nasm_reg_names[(o->basereg-EXPR_REG_START)]);
+ nasm_reg_names[(o->basereg-EXPR_REG_START)]);
started = true;
}
if (o->indexreg != -1 && !(flags & IF_MIB)) {
if (started)
output[slen++] = '+';
slen += snprintf(output + slen, outbufsize - slen, "%s",
- nasm_reg_names[(o->indexreg-EXPR_REG_START)]);
+ nasm_reg_names[(o->indexreg-EXPR_REG_START)]);
if (o->scale > 1)
slen +=
snprintf(output + slen, outbufsize - slen, "*%d",
- o->scale);
+ o->scale);
started = true;
}
if (o->segment & SEG_DISP8) {
- const char *prefix;
- uint8_t offset = offs;
- if ((int8_t)offset < 0) {
- prefix = "-";
- offset = -offset;
- } else {
- prefix = "+";
- }
+ const char *prefix;
+ uint8_t offset = offs;
+ if ((int8_t)offset < 0) {
+ prefix = "-";
+ offset = -offset;
+ } else {
+ prefix = "+";
+ }
slen +=
snprintf(output + slen, outbufsize - slen, "%s0x%"PRIx8"",
- prefix, offset);
+ prefix, offset);
} else if (o->segment & SEG_DISP16) {
- const char *prefix;
- uint16_t offset = offs;
- if ((int16_t)offset < 0 && started) {
- offset = -offset;
- prefix = "-";
- } else {
- prefix = started ? "+" : "";
- }
+ const char *prefix;
+ uint16_t offset = offs;
+ if ((int16_t)offset < 0 && started) {
+ offset = -offset;
+ prefix = "-";
+ } else {
+ prefix = started ? "+" : "";
+ }
slen +=
snprintf(output + slen, outbufsize - slen,
- "%s0x%"PRIx16"", prefix, offset);
+ "%s0x%"PRIx16"", prefix, offset);
} else if (o->segment & SEG_DISP32) {
- if (prefix.asize == 64) {
- const char *prefix;
- uint64_t offset = (int64_t)(int32_t)offs;
- if ((int32_t)offs < 0 && started) {
- offset = -offset;
- prefix = "-";
- } else {
- prefix = started ? "+" : "";
- }
- slen +=
- snprintf(output + slen, outbufsize - slen,
- "%s0x%"PRIx64"", prefix, offset);
- } else {
- const char *prefix;
- uint32_t offset = offs;
- if ((int32_t) offset < 0 && started) {
- offset = -offset;
- prefix = "-";
- } else {
- prefix = started ? "+" : "";
- }
- slen +=
- snprintf(output + slen, outbufsize - slen,
- "%s0x%"PRIx32"", prefix, offset);
- }
+ if (prefix.asize == 64) {
+ const char *prefix;
+ uint64_t offset = (int64_t)(int32_t)offs;
+ if ((int32_t)offs < 0 && started) {
+ offset = -offset;
+ prefix = "-";
+ } else {
+ prefix = started ? "+" : "";
+ }
+ slen +=
+ snprintf(output + slen, outbufsize - slen,
+ "%s0x%"PRIx64"", prefix, offset);
+ } else {
+ const char *prefix;
+ uint32_t offset = offs;
+ if ((int32_t) offset < 0 && started) {
+ offset = -offset;
+ prefix = "-";
+ } else {
+ prefix = started ? "+" : "";
+ }
+ slen +=
+ snprintf(output + slen, outbufsize - slen,
+ "%s0x%"PRIx32"", prefix, offset);
+ }
}
if (o->indexreg != -1 && (flags & IF_MIB)) {
output[slen++] = ',';
slen += snprintf(output + slen, outbufsize - slen, "%s",
- nasm_reg_names[(o->indexreg-EXPR_REG_START)]);
+ nasm_reg_names[(o->indexreg-EXPR_REG_START)]);
if (o->scale > 1)
slen +=
snprintf(output + slen, outbufsize - slen, "*%d",
- o->scale);
+ o->scale);
started = true;
}
} else {
slen +=
snprintf(output + slen, outbufsize - slen, "<operand%d>",
- i);
+ i);
}
}
output[slen] = '\0';
{
uint8_t byte = *data;
const char *str = NULL;
-
+
switch (byte) {
case 0xF2:
- str = "repne";
- break;
+ str = "repne";
+ break;
case 0xF3:
- str = "rep";
- break;
+ str = "rep";
+ break;
case 0x9B:
- str = "wait";
- break;
+ str = "wait";
+ break;
case 0xF0:
- str = "lock";
- break;
+ str = "lock";
+ break;
case 0x2E:
- str = "cs";
- break;
+ str = "cs";
+ break;
case 0x36:
- str = "ss";
- break;
+ str = "ss";
+ break;
case 0x3E:
- str = "ss";
- break;
+ str = "ss";
+ break;
case 0x26:
- str = "es";
- break;
+ str = "es";
+ break;
case 0x64:
- str = "fs";
- break;
+ str = "fs";
+ break;
case 0x65:
- str = "gs";
- break;
+ str = "gs";
+ break;
case 0x66:
- str = (segsize == 16) ? "o32" : "o16";
- break;
+ str = (segsize == 16) ? "o32" : "o16";
+ break;
case 0x67:
- str = (segsize == 32) ? "a16" : "a32";
- break;
+ str = (segsize == 32) ? "a16" : "a32";
+ break;
case REX_P + 0x0:
case REX_P + 0x1:
case REX_P + 0x2:
case REX_P + 0xD:
case REX_P + 0xE:
case REX_P + 0xF:
- if (segsize == 64) {
- snprintf(output, outbufsize, "rex%s%s%s%s%s",
- (byte == REX_P) ? "" : ".",
- (byte & REX_W) ? "w" : "",
- (byte & REX_R) ? "r" : "",
- (byte & REX_X) ? "x" : "",
- (byte & REX_B) ? "b" : "");
- break;
- }
- /* else fall through */
+ if (segsize == 64) {
+ snprintf(output, outbufsize, "rex%s%s%s%s%s",
+ (byte == REX_P) ? "" : ".",
+ (byte & REX_W) ? "w" : "",
+ (byte & REX_R) ? "r" : "",
+ (byte & REX_X) ? "x" : "",
+ (byte & REX_B) ? "b" : "");
+ break;
+ }
+ /* else fall through */
default:
- snprintf(output, outbufsize, "db 0x%02x", byte);
- break;
+ snprintf(output, outbufsize, "db 0x%02x", byte);
+ break;
}
if (str)
- snprintf(output, outbufsize, "%s", str);
+ snprintf(output, outbufsize, "%s", str);
return 1;
}
projects / platform / upstream / nasm.git / commitdiff