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db358a2993
nasm/assemble.c
Jin Kyu Song db358a2993 AVX-512: Fix bugs related to uninitialized variables 
Initialized disp8 to avoid a case that disp8 encoded
instead of the actual offset value.
Added a checking routine for basereg value before using it
as an index of array.

Signed-off-by: Jin Kyu Song <jin.kyu.song@intel.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
2013-09-21 12:26:36 +04:00

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/* ----------------------------------------------------------------------- *
*
* Copyright 1996-2013 The NASM Authors - All Rights Reserved
* See the file AUTHORS included with the NASM distribution for
* the specific copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ----------------------------------------------------------------------- */
/*
* assemble.c code generation for the Netwide Assembler
*
* the actual codes (C syntax, i.e. octal):
* \0 - terminates the code. (Unless it's a literal of course.)
* \1..\4 - that many literal bytes follow in the code stream
* \5 - add 4 to the primary operand number (b, low octdigit)
* \6 - add 4 to the secondary operand number (a, middle octdigit)
* \7 - add 4 to both the primary and the secondary operand number
* \10..\13 - a literal byte follows in the code stream, to be added
* to the register value of operand 0..3
* \20..\23 - a byte immediate operand, from operand 0..3
* \24..\27 - a zero-extended byte immediate operand, from operand 0..3
* \30..\33 - a word immediate operand, from operand 0..3
* \34..\37 - select between \3[0-3] and \4[0-3] depending on 16/32 bit
* assembly mode or the operand-size override on the operand
* \40..\43 - a long immediate operand, from operand 0..3
* \44..\47 - select between \3[0-3], \4[0-3] and \5[4-7]
* depending on the address size of the instruction.
* \50..\53 - a byte relative operand, from operand 0..3
* \54..\57 - a qword immediate operand, from operand 0..3
* \60..\63 - a word relative operand, from operand 0..3
* \64..\67 - select between \6[0-3] and \7[0-3] depending on 16/32 bit
* assembly mode or the operand-size override on the operand
* \70..\73 - a long relative operand, from operand 0..3
* \74..\77 - a word constant, from the _segment_ part of operand 0..3
* \1ab - a ModRM, calculated on EA in operand a, with the spare
* field the register value of operand b.
* \172\ab - the register number from operand a in bits 7..4, with
* the 4-bit immediate from operand b in bits 3..0.
* \173\xab - the register number from operand a in bits 7..4, with
* the value b in bits 3..0.
* \174..\177 - the register number from operand 0..3 in bits 7..4, and
* an arbitrary value in bits 3..0 (assembled as zero.)
* \2ab - a ModRM, calculated on EA in operand a, with the spare
* field equal to digit b.
*
* \240..\243 - this instruction uses EVEX rather than REX or VEX/XOP, with the
* V field taken from operand 0..3.
* \250 - this instruction uses EVEX rather than REX or VEX/XOP, with the
* V field set to 1111b.
* EVEX prefixes are followed by the sequence:
* \cm\wlp\tup where cm is:
* cc 000 0mm
* c = 2 for EVEX and m is the legacy escape (0f, 0f38, 0f3a)
* and wlp is:
* 00 wwl lpp
* [l0] ll = 0 (.128, .lz)
* [l1] ll = 1 (.256)
* [l2] ll = 2 (.512)
* [lig] ll = 3 for EVEX.L'L don't care (always assembled as 0)
*
* [w0] ww = 0 for W = 0
* [w1] ww = 1 for W = 1
* [wig] ww = 2 for W don't care (always assembled as 0)
* [ww] ww = 3 for W used as REX.W
*
* [p0] pp = 0 for no prefix
* [60] pp = 1 for legacy prefix 60
* [f3] pp = 2
* [f2] pp = 3
*
* tup is tuple type for Disp8*N from %tuple_codes in insns.pl
* (compressed displacement encoding)
*
* \254..\257 - a signed 32-bit operand to be extended to 64 bits.
* \260..\263 - this instruction uses VEX/XOP rather than REX, with the
* V field taken from operand 0..3.
* \270 - this instruction uses VEX/XOP rather than REX, with the
* V field set to 1111b.
*
* VEX/XOP prefixes are followed by the sequence:
* \tmm\wlp where mm is the M field; and wlp is:
* 00 wwl lpp
* [l0] ll = 0 for L = 0 (.128, .lz)
* [l1] ll = 1 for L = 1 (.256)
* [lig] ll = 2 for L don't care (always assembled as 0)
*
* [w0] ww = 0 for W = 0
* [w1 ] ww = 1 for W = 1
* [wig] ww = 2 for W don't care (always assembled as 0)
* [ww] ww = 3 for W used as REX.W
*
* t = 0 for VEX (C4/C5), t = 1 for XOP (8F).
*
* \271 - instruction takes XRELEASE (F3) with or without lock
* \272 - instruction takes XACQUIRE/XRELEASE with or without lock
* \273 - instruction takes XACQUIRE/XRELEASE with lock only
* \274..\277 - a byte immediate operand, from operand 0..3, sign-extended
* to the operand size (if o16/o32/o64 present) or the bit size
* \310 - indicates fixed 16-bit address size, i.e. optional 0x67.
* \311 - indicates fixed 32-bit address size, i.e. optional 0x67.
* \312 - (disassembler only) invalid with non-default address size.
* \313 - indicates fixed 64-bit address size, 0x67 invalid.
* \314 - (disassembler only) invalid with REX.B
* \315 - (disassembler only) invalid with REX.X
* \316 - (disassembler only) invalid with REX.R
* \317 - (disassembler only) invalid with REX.W
* \320 - indicates fixed 16-bit operand size, i.e. optional 0x66.
* \321 - indicates fixed 32-bit operand size, i.e. optional 0x66.
* \322 - indicates that this instruction is only valid when the
* operand size is the default (instruction to disassembler,
* generates no code in the assembler)
* \323 - indicates fixed 64-bit operand size, REX on extensions only.
* \324 - indicates 64-bit operand size requiring REX prefix.
* \325 - instruction which always uses spl/bpl/sil/dil
* \326 - instruction not valid with 0xF3 REP prefix. Hint for
disassembler only; for SSE instructions.
* \330 - a literal byte follows in the code stream, to be added
* to the condition code value of the instruction.
* \331 - instruction not valid with REP prefix. Hint for
* disassembler only; for SSE instructions.
* \332 - REP prefix (0xF2 byte) used as opcode extension.
* \333 - REP prefix (0xF3 byte) used as opcode extension.
* \334 - LOCK prefix used as REX.R (used in non-64-bit mode)
* \335 - disassemble a rep (0xF3 byte) prefix as repe not rep.
* \336 - force a REP(E) prefix (0xF3) even if not specified.
* \337 - force a REPNE prefix (0xF2) even if not specified.
* \336-\337 are still listed as prefixes in the disassembler.
* \340 - reserve <operand 0> bytes of uninitialized storage.
* Operand 0 had better be a segmentless constant.
* \341 - this instruction needs a WAIT "prefix"
* \360 - no SSE prefix (== \364\331)
* \361 - 66 SSE prefix (== \366\331)
* \364 - operand-size prefix (0x66) not permitted
* \365 - address-size prefix (0x67) not permitted
* \366 - operand-size prefix (0x66) used as opcode extension
* \367 - address-size prefix (0x67) used as opcode extension
* \370,\371 - match only if operand 0 meets byte jump criteria.
* 370 is used for Jcc, 371 is used for JMP.
* \373 - assemble 0x03 if bits==16, 0x05 if bits==32;
* used for conditional jump over longer jump
* \374 - this instruction takes an XMM VSIB memory EA
* \375 - this instruction takes an YMM VSIB memory EA
* \376 - this instruction takes an ZMM VSIB memory EA
*/
#include "compiler.h"
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include "nasm.h"
#include "nasmlib.h"
#include "assemble.h"
#include "insns.h"
#include "tables.h"
enum match_result {
/*
* Matching errors. These should be sorted so that more specific
* errors come later in the sequence.
*/
MERR_INVALOP,
MERR_OPSIZEMISSING,
MERR_OPSIZEMISMATCH,
MERR_BADCPU,
MERR_BADMODE,
MERR_BADHLE,
MERR_ENCMISMATCH,
/*
* Matching success; the conditional ones first
*/
MOK_JUMP, /* Matching OK but needs jmp_match() */
MOK_GOOD /* Matching unconditionally OK */
};
typedef struct {
enum ea_type type; /* what kind of EA is this? */
int sib_present; /* is a SIB byte necessary? */
int bytes; /* # of bytes of offset needed */
int size; /* lazy - this is sib+bytes+1 */
uint8_t modrm, sib, rex, rip; /* the bytes themselves */
int8_t disp8; /* compressed displacement for EVEX */
} ea;
#define GEN_SIB(scale, index, base) \
(((scale) << 6) | ((index) << 3) | ((base)))
#define GEN_MODRM(mod, reg, rm) \
(((mod) << 6) | (((reg) & 7) << 3) | ((rm) & 7))
static iflags_t cpu; /* cpu level received from nasm.c */
static efunc errfunc;
static struct ofmt *outfmt;
static ListGen *list;
static int64_t calcsize(int32_t, int64_t, int, insn *,
const struct itemplate *);
static void gencode(int32_t segment, int64_t offset, int bits,
insn * ins, const struct itemplate *temp,
int64_t insn_end);
static enum match_result find_match(const struct itemplate **tempp,
insn *instruction,
int32_t segment, int64_t offset, int bits);
static enum match_result matches(const struct itemplate *, insn *, int bits);
static opflags_t regflag(const operand *);
static int32_t regval(const operand *);
static int rexflags(int, opflags_t, int);
static int op_rexflags(const operand *, int);
static int op_evexflags(const operand *, int, uint8_t);
static void add_asp(insn *, int);
static enum ea_type process_ea(operand *, ea *, int, int, opflags_t, insn *);
static int has_prefix(insn * ins, enum prefix_pos pos, int prefix)
{
return ins->prefixes[pos] == prefix;
}
static void assert_no_prefix(insn * ins, enum prefix_pos pos)
{
if (ins->prefixes[pos])
errfunc(ERR_NONFATAL, "invalid %s prefix",
prefix_name(ins->prefixes[pos]));
}
static const char *size_name(int size)
{
switch (size) {
case 1:
return "byte";
case 2:
return "word";
case 4:
return "dword";
case 8:
return "qword";
case 10:
return "tword";
case 16:
return "oword";
case 32:
return "yword";
case 64:
return "zword";
default:
return "???";
}
}
static void warn_overflow(int pass, int size)
{
errfunc(ERR_WARNING | pass | ERR_WARN_NOV,
"%s data exceeds bounds", size_name(size));
}
static void warn_overflow_const(int64_t data, int size)
{
if (overflow_general(data, size))
warn_overflow(ERR_PASS1, size);
}
static void warn_overflow_opd(const struct operand *o, int size)
{
if (o->wrt == NO_SEG && o->segment == NO_SEG) {
if (overflow_general(o->offset, size))
warn_overflow(ERR_PASS2, size);
}
}
/*
* This routine wrappers the real output format's output routine,
* in order to pass a copy of the data off to the listing file
* generator at the same time.
*/
static void out(int64_t offset, int32_t segto, const void *data,
enum out_type type, uint64_t size,
int32_t segment, int32_t wrt)
{
static int32_t lineno = 0; /* static!!! */
static char *lnfname = NULL;
uint8_t p[8];
if (type == OUT_ADDRESS && segment == NO_SEG && wrt == NO_SEG) {
/*
* This is a non-relocated address, and we're going to
* convert it into RAWDATA format.
*/
uint8_t *q = p;
if (size > 8) {
errfunc(ERR_PANIC, "OUT_ADDRESS with size > 8");
return;
}
WRITEADDR(q, *(int64_t *)data, size);
data = p;
type = OUT_RAWDATA;
}
list->output(offset, data, type, size);
/*
* this call to src_get determines when we call the
* debug-format-specific "linenum" function
* it updates lineno and lnfname to the current values
* returning 0 if "same as last time", -2 if lnfname
* changed, and the amount by which lineno changed,
* if it did. thus, these variables must be static
*/
if (src_get(&lineno, &lnfname))
outfmt->current_dfmt->linenum(lnfname, lineno, segto);
outfmt->output(segto, data, type, size, segment, wrt);
}
static void out_imm8(int64_t offset, int32_t segment, struct operand *opx)
{
if (opx->segment != NO_SEG) {
uint64_t data = opx->offset;
out(offset, segment, &data, OUT_ADDRESS, 1, opx->segment, opx->wrt);
} else {
uint8_t byte = opx->offset;
out(offset, segment, &byte, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
}
}
static bool jmp_match(int32_t segment, int64_t offset, int bits,
insn * ins, const struct itemplate *temp)
{
int64_t isize;
const uint8_t *code = temp->code;
uint8_t c = code[0];
if (((c & ~1) != 0370) || (ins->oprs[0].type & STRICT))
return false;
if (!optimizing)
return false;
if (optimizing < 0 && c == 0371)
return false;
isize = calcsize(segment, offset, bits, ins, temp);
if (ins->oprs[0].opflags & OPFLAG_UNKNOWN)
/* Be optimistic in pass 1 */
return true;
if (ins->oprs[0].segment != segment)
return false;
isize = ins->oprs[0].offset - offset - isize; /* isize is delta */
return (isize >= -128 && isize <= 127); /* is it byte size? */
}
int64_t assemble(int32_t segment, int64_t offset, int bits, iflags_t cp,
insn * instruction, struct ofmt *output, efunc error,
ListGen * listgen)
{
const struct itemplate *temp;
int j;
enum match_result m;
int64_t insn_end;
int32_t itimes;
int64_t start = offset;
int64_t wsize; /* size for DB etc. */
errfunc = error; /* to pass to other functions */
cpu = cp;
outfmt = output; /* likewise */
list = listgen; /* and again */
wsize = idata_bytes(instruction->opcode);
if (wsize == -1)
return 0;
if (wsize) {
extop *e;
int32_t t = instruction->times;
if (t < 0)
errfunc(ERR_PANIC,
"instruction->times < 0 (%ld) in assemble()", t);
while (t--) { /* repeat TIMES times */
list_for_each(e, instruction->eops) {
if (e->type == EOT_DB_NUMBER) {
if (wsize > 8) {
errfunc(ERR_NONFATAL,
"integer supplied to a DT, DO or DY"
" instruction");
} else {
out(offset, segment, &e->offset,
OUT_ADDRESS, wsize, e->segment, e->wrt);
offset += wsize;
}
} else if (e->type == EOT_DB_STRING ||
e->type == EOT_DB_STRING_FREE) {
int align;
out(offset, segment, e->stringval,
OUT_RAWDATA, e->stringlen, NO_SEG, NO_SEG);
align = e->stringlen % wsize;
if (align) {
align = wsize - align;
out(offset, segment, zero_buffer,
OUT_RAWDATA, align, NO_SEG, NO_SEG);
}
offset += e->stringlen + align;
}
}
if (t > 0 && t == instruction->times - 1) {
/*
* Dummy call to list->output to give the offset to the
* listing module.
*/
list->output(offset, NULL, OUT_RAWDATA, 0);
list->uplevel(LIST_TIMES);
}
}
if (instruction->times > 1)
list->downlevel(LIST_TIMES);
return offset - start;
}
if (instruction->opcode == I_INCBIN) {
const char *fname = instruction->eops->stringval;
FILE *fp;
fp = fopen(fname, "rb");
if (!fp) {
error(ERR_NONFATAL, "`incbin': unable to open file `%s'",
fname);
} else if (fseek(fp, 0L, SEEK_END) < 0) {
error(ERR_NONFATAL, "`incbin': unable to seek on file `%s'",
fname);
fclose(fp);
} else {
static char buf[4096];
size_t t = instruction->times;
size_t base = 0;
size_t len;
len = ftell(fp);
if (instruction->eops->next) {
base = instruction->eops->next->offset;
len -= base;
if (instruction->eops->next->next &&
len > (size_t)instruction->eops->next->next->offset)
len = (size_t)instruction->eops->next->next->offset;
}
/*
* Dummy call to list->output to give the offset to the
* listing module.
*/
list->output(offset, NULL, OUT_RAWDATA, 0);
list->uplevel(LIST_INCBIN);
while (t--) {
size_t l;
fseek(fp, base, SEEK_SET);
l = len;
while (l > 0) {
int32_t m;
m = fread(buf, 1, l > sizeof(buf) ? sizeof(buf) : l, fp);
if (!m) {
/*
* This shouldn't happen unless the file
* actually changes while we are reading
* it.
*/
error(ERR_NONFATAL,
"`incbin': unexpected EOF while"
" reading file `%s'", fname);
t = 0; /* Try to exit cleanly */
break;
}
out(offset, segment, buf, OUT_RAWDATA, m,
NO_SEG, NO_SEG);
l -= m;
}
}
list->downlevel(LIST_INCBIN);
if (instruction->times > 1) {
/*
* Dummy call to list->output to give the offset to the
* listing module.
*/
list->output(offset, NULL, OUT_RAWDATA, 0);
list->uplevel(LIST_TIMES);
list->downlevel(LIST_TIMES);
}
fclose(fp);
return instruction->times * len;
}
return 0; /* if we're here, there's an error */
}
/* Check to see if we need an address-size prefix */
add_asp(instruction, bits);
m = find_match(&temp, instruction, segment, offset, bits);
if (m == MOK_GOOD) {
/* Matches! */
int64_t insn_size = calcsize(segment, offset, bits, instruction, temp);
itimes = instruction->times;
if (insn_size < 0) /* shouldn't be, on pass two */
error(ERR_PANIC, "errors made it through from pass one");
else
while (itimes--) {
for (j = 0; j < MAXPREFIX; j++) {
uint8_t c = 0;
switch (instruction->prefixes[j]) {
case P_WAIT:
c = 0x9B;
break;
case P_LOCK:
c = 0xF0;
break;
case P_REPNE:
case P_REPNZ:
case P_XACQUIRE:
c = 0xF2;
break;
case P_REPE:
case P_REPZ:
case P_REP:
case P_XRELEASE:
c = 0xF3;
break;
case R_CS:
if (bits == 64) {
error(ERR_WARNING | ERR_PASS2,
"cs segment base generated, but will be ignored in 64-bit mode");
}
c = 0x2E;
break;
case R_DS:
if (bits == 64) {
error(ERR_WARNING | ERR_PASS2,
"ds segment base generated, but will be ignored in 64-bit mode");
}
c = 0x3E;
break;
case R_ES:
if (bits == 64) {
error(ERR_WARNING | ERR_PASS2,
"es segment base generated, but will be ignored in 64-bit mode");
}
c = 0x26;
break;
case R_FS:
c = 0x64;
break;
case R_GS:
c = 0x65;
break;
case R_SS:
if (bits == 64) {
error(ERR_WARNING | ERR_PASS2,
"ss segment base generated, but will be ignored in 64-bit mode");
}
c = 0x36;
break;
case R_SEGR6:
case R_SEGR7:
error(ERR_NONFATAL,
"segr6 and segr7 cannot be used as prefixes");
break;
case P_A16:
if (bits == 64) {
error(ERR_NONFATAL,
"16-bit addressing is not supported "
"in 64-bit mode");
} else if (bits != 16)
c = 0x67;
break;
case P_A32:
if (bits != 32)
c = 0x67;
break;
case P_A64:
if (bits != 64) {
error(ERR_NONFATAL,
"64-bit addressing is only supported "
"in 64-bit mode");
}
break;
case P_ASP:
c = 0x67;
break;
case P_O16:
if (bits != 16)
c = 0x66;
break;
case P_O32:
if (bits == 16)
c = 0x66;
break;
case P_O64:
/* REX.W */
break;
case P_OSP:
c = 0x66;
break;
case P_none:
break;
default:
error(ERR_PANIC, "invalid instruction prefix");
}
if (c != 0) {
out(offset, segment, &c, OUT_RAWDATA, 1,
NO_SEG, NO_SEG);
offset++;
}
}
insn_end = offset + insn_size;
gencode(segment, offset, bits, instruction,
temp, insn_end);
offset += insn_size;
if (itimes > 0 && itimes == instruction->times - 1) {
/*
* Dummy call to list->output to give the offset to the
* listing module.
*/
list->output(offset, NULL, OUT_RAWDATA, 0);
list->uplevel(LIST_TIMES);
}
}
if (instruction->times > 1)
list->downlevel(LIST_TIMES);
return offset - start;
} else {
/* No match */
switch (m) {
case MERR_OPSIZEMISSING:
error(ERR_NONFATAL, "operation size not specified");
break;
case MERR_OPSIZEMISMATCH:
error(ERR_NONFATAL, "mismatch in operand sizes");
break;
case MERR_BADCPU:
error(ERR_NONFATAL, "no instruction for this cpu level");
break;
case MERR_BADMODE:
error(ERR_NONFATAL, "instruction not supported in %d-bit mode",
bits);
break;
default:
error(ERR_NONFATAL,
"invalid combination of opcode and operands");
break;
}
}
return 0;
}
int64_t insn_size(int32_t segment, int64_t offset, int bits, iflags_t cp,
insn * instruction, efunc error)
{
const struct itemplate *temp;
enum match_result m;
errfunc = error; /* to pass to other functions */
cpu = cp;
if (instruction->opcode == I_none)
return 0;
if (instruction->opcode == I_DB || instruction->opcode == I_DW ||
instruction->opcode == I_DD || instruction->opcode == I_DQ ||
instruction->opcode == I_DT || instruction->opcode == I_DO ||
instruction->opcode == I_DY) {
extop *e;
int32_t isize, osize, wsize;
isize = 0;
wsize = idata_bytes(instruction->opcode);
list_for_each(e, instruction->eops) {
int32_t align;
osize = 0;
if (e->type == EOT_DB_NUMBER) {
osize = 1;
warn_overflow_const(e->offset, wsize);
} else if (e->type == EOT_DB_STRING ||
e->type == EOT_DB_STRING_FREE)
osize = e->stringlen;
align = (-osize) % wsize;
if (align < 0)
align += wsize;
isize += osize + align;
}
return isize * instruction->times;
}
if (instruction->opcode == I_INCBIN) {
const char *fname = instruction->eops->stringval;
FILE *fp;
int64_t val = 0;
size_t len;
fp = fopen(fname, "rb");
if (!fp)
error(ERR_NONFATAL, "`incbin': unable to open file `%s'",
fname);
else if (fseek(fp, 0L, SEEK_END) < 0)
error(ERR_NONFATAL, "`incbin': unable to seek on file `%s'",
fname);
else {
len = ftell(fp);
if (instruction->eops->next) {
len -= instruction->eops->next->offset;
if (instruction->eops->next->next &&
len > (size_t)instruction->eops->next->next->offset) {
len = (size_t)instruction->eops->next->next->offset;
}
}
val = instruction->times * len;
}
if (fp)
fclose(fp);
return val;
}
/* Check to see if we need an address-size prefix */
add_asp(instruction, bits);
m = find_match(&temp, instruction, segment, offset, bits);
if (m == MOK_GOOD) {
/* we've matched an instruction. */
int64_t isize;
int j;
isize = calcsize(segment, offset, bits, instruction, temp);
if (isize < 0)
return -1;
for (j = 0; j < MAXPREFIX; j++) {
switch (instruction->prefixes[j]) {
case P_A16:
if (bits != 16)
isize++;
break;
case P_A32:
if (bits != 32)
isize++;
break;
case P_O16:
if (bits != 16)
isize++;
break;
case P_O32:
if (bits == 16)
isize++;
break;
case P_A64:
case P_O64:
case P_none:
break;
default:
isize++;
break;
}
}
return isize * instruction->times;
} else {
return -1; /* didn't match any instruction */
}
}
static void bad_hle_warn(const insn * ins, uint8_t hleok)
{
enum prefixes rep_pfx = ins->prefixes[PPS_REP];
enum whatwarn { w_none, w_lock, w_inval } ww;
static const enum whatwarn warn[2][4] =
{
{ w_inval, w_inval, w_none, w_lock }, /* XACQUIRE */
{ w_inval, w_none, w_none, w_lock }, /* XRELEASE */
};
unsigned int n;
n = (unsigned int)rep_pfx - P_XACQUIRE;
if (n > 1)
return; /* Not XACQUIRE/XRELEASE */
ww = warn[n][hleok];
if (!is_class(MEMORY, ins->oprs[0].type))
ww = w_inval; /* HLE requires operand 0 to be memory */
switch (ww) {
case w_none:
break;
case w_lock:
if (ins->prefixes[PPS_LOCK] != P_LOCK) {
errfunc(ERR_WARNING | ERR_WARN_HLE | ERR_PASS2,
"%s with this instruction requires lock",
prefix_name(rep_pfx));
}
break;
case w_inval:
errfunc(ERR_WARNING | ERR_WARN_HLE | ERR_PASS2,
"%s invalid with this instruction",
prefix_name(rep_pfx));
break;
}
}
/* Common construct */
#define case3(x) case (x): case (x)+1: case (x)+2
#define case4(x) case3(x): case (x)+3
static int64_t calcsize(int32_t segment, int64_t offset, int bits,
insn * ins, const struct itemplate *temp)
{
const uint8_t *codes = temp->code;
int64_t length = 0;
uint8_t c;
int rex_mask = ~0;
int op1, op2;
struct operand *opx;
uint8_t opex = 0;
enum ea_type eat;
uint8_t hleok = 0;
bool lockcheck = true;
ins->rex = 0; /* Ensure REX is reset */
eat = EA_SCALAR; /* Expect a scalar EA */
memset(ins->evex_p, 0, 3); /* Ensure EVEX is reset */
if (ins->prefixes[PPS_OSIZE] == P_O64)
ins->rex |= REX_W;
(void)segment; /* Don't warn that this parameter is unused */
(void)offset; /* Don't warn that this parameter is unused */
while (*codes) {
c = *codes++;
op1 = (c & 3) + ((opex & 1) << 2);
op2 = ((c >> 3) & 3) + ((opex & 2) << 1);
opx = &ins->oprs[op1];
opex = 0; /* For the next iteration */
switch (c) {
case4(01):
codes += c, length += c;
break;
case3(05):
opex = c;
break;
case4(010):
ins->rex |=
op_rexflags(opx, REX_B|REX_H|REX_P|REX_W);
codes++, length++;
break;
case4(020):
case4(024):
length++;
break;
case4(030):
length += 2;
break;
case4(034):
if (opx->type & (BITS16 | BITS32 | BITS64))
length += (opx->type & BITS16) ? 2 : 4;
else
length += (bits == 16) ? 2 : 4;
break;
case4(040):
length += 4;
break;
case4(044):
length += ins->addr_size >> 3;
break;
case4(050):
length++;
break;
case4(054):
length += 8; /* MOV reg64/imm */
break;
case4(060):
length += 2;
break;
case4(064):
if (opx->type & (BITS16 | BITS32 | BITS64))
length += (opx->type & BITS16) ? 2 : 4;
else
length += (bits == 16) ? 2 : 4;
break;
case4(070):
length += 4;
break;
case4(074):
length += 2;
break;
case 0172:
case 0173:
codes++;
length++;
break;
case4(0174):
length++;
break;
case4(0240):
ins->rex |= REX_EV;
ins->vexreg = regval(opx);
ins->evex_p[2] |= op_evexflags(opx, EVEX_P2VP, 2); /* High-16 NDS */
ins->vex_cm = *codes++;
ins->vex_wlp = *codes++;
ins->evex_tuple = (*codes++ - 0300);
break;
case 0250:
ins->rex |= REX_EV;
ins->vexreg = 0;
ins->vex_cm = *codes++;
ins->vex_wlp = *codes++;
ins->evex_tuple = (*codes++ - 0300);
break;
case4(0254):
length += 4;
break;
case4(0260):
ins->rex |= REX_V;
ins->vexreg = regval(opx);
ins->vex_cm = *codes++;
ins->vex_wlp = *codes++;
break;
case 0270:
ins->rex |= REX_V;
ins->vexreg = 0;
ins->vex_cm = *codes++;
ins->vex_wlp = *codes++;
break;
case3(0271):
hleok = c & 3;
break;
case4(0274):
length++;
break;
case4(0300):
break;
case 0310:
if (bits == 64)
return -1;
length += (bits != 16) && !has_prefix(ins, PPS_ASIZE, P_A16);
break;
case 0311:
length += (bits != 32) && !has_prefix(ins, PPS_ASIZE, P_A32);
break;
case 0312:
break;
case 0313:
if (bits != 64 || has_prefix(ins, PPS_ASIZE, P_A16) ||
has_prefix(ins, PPS_ASIZE, P_A32))
return -1;
break;
case4(0314):
break;
case 0320:
{
enum prefixes pfx = ins->prefixes[PPS_OSIZE];
if (pfx == P_O16)
break;
if (pfx != P_none)
errfunc(ERR_WARNING | ERR_PASS2, "invalid operand size prefix");
else
ins->prefixes[PPS_OSIZE] = P_O16;
break;
}
case 0321:
{
enum prefixes pfx = ins->prefixes[PPS_OSIZE];
if (pfx == P_O32)
break;
if (pfx != P_none)
errfunc(ERR_WARNING | ERR_PASS2, "invalid operand size prefix");
else
ins->prefixes[PPS_OSIZE] = P_O32;
break;
}
case 0322:
break;
case 0323:
rex_mask &= ~REX_W;
break;
case 0324:
ins->rex |= REX_W;
break;
case 0325:
ins->rex |= REX_NH;
break;
case 0326:
break;
case 0330:
codes++, length++;
break;
case 0331:
break;
case 0332:
case 0333:
length++;
break;
case 0334:
ins->rex |= REX_L;
break;
case 0335:
break;
case 0336:
if (!ins->prefixes[PPS_REP])
ins->prefixes[PPS_REP] = P_REP;
break;
case 0337:
if (!ins->prefixes[PPS_REP])
ins->prefixes[PPS_REP] = P_REPNE;
break;
case 0340:
if (ins->oprs[0].segment != NO_SEG)
errfunc(ERR_NONFATAL, "attempt to reserve non-constant"
" quantity of BSS space");
else
length += ins->oprs[0].offset;
break;
case 0341:
if (!ins->prefixes[PPS_WAIT])
ins->prefixes[PPS_WAIT] = P_WAIT;
break;
case 0360:
break;
case 0361:
length++;
break;
case 0364:
case 0365:
break;
case 0366:
case 0367:
length++;
break;
case3(0370):
break;
case 0373:
length++;
break;
case 0374:
eat = EA_XMMVSIB;
break;
case 0375:
eat = EA_YMMVSIB;
break;
case 0376:
eat = EA_ZMMVSIB;
break;
case4(0100):
case4(0110):
case4(0120):
case4(0130):
case4(0200):
case4(0204):
case4(0210):
case4(0214):
case4(0220):
case4(0224):
case4(0230):
case4(0234):
{
ea ea_data;
int rfield;
opflags_t rflags;
struct operand *opy = &ins->oprs[op2];
struct operand *op_er_sae;
ea_data.rex = 0; /* Ensure ea.REX is initially 0 */
if (c <= 0177) {
/* pick rfield from operand b (opx) */
rflags = regflag(opx);
rfield = nasm_regvals[opx->basereg];
} else {
rflags = 0;
rfield = c & 7;
}
/* EVEX.b1 : evex_brerop contains the operand position */
op_er_sae = (ins->evex_brerop >= 0 ?
&ins->oprs[ins->evex_brerop] : NULL);
if (op_er_sae && (op_er_sae->decoflags & (ER | SAE))) {
/* set EVEX.b */
ins->evex_p[2] |= EVEX_P2B;
if (op_er_sae->decoflags & ER) {
/* set EVEX.RC (rounding control) */
ins->evex_p[2] |= ((ins->evex_rm - BRC_RN) << 5)
& EVEX_P2RC;
}
} else {
/* set EVEX.L'L (vector length) */
ins->evex_p[2] |= ((ins->vex_wlp << (5 - 2)) & EVEX_P2LL);
if (opy->decoflags & BRDCAST_MASK) {
/* set EVEX.b */
ins->evex_p[2] |= EVEX_P2B;
}
}
if (process_ea(opy, &ea_data, bits,
rfield, rflags, ins) != eat) {
errfunc(ERR_NONFATAL, "invalid effective address");
return -1;
} else {
ins->rex |= ea_data.rex;
length += ea_data.size;
}
}
break;
default:
errfunc(ERR_PANIC, "internal instruction table corrupt"
": instruction code \\%o (0x%02X) given", c, c);
break;
}
}
ins->rex &= rex_mask;
if (ins->rex & REX_NH) {
if (ins->rex & REX_H) {
errfunc(ERR_NONFATAL, "instruction cannot use high registers");
return -1;
}
ins->rex &= ~REX_P; /* Don't force REX prefix due to high reg */
}
if (ins->rex & (REX_V | REX_EV)) {
int bad32 = REX_R|REX_W|REX_X|REX_B;
if (ins->rex & REX_H) {
errfunc(ERR_NONFATAL, "cannot use high register in AVX instruction");
return -1;
}
switch (ins->vex_wlp & 060) {
case 000:
case 040:
ins->rex &= ~REX_W;
break;
case 020:
ins->rex |= REX_W;
bad32 &= ~REX_W;
break;
case 060:
/* Follow REX_W */
break;
}
if (bits != 64 && ((ins->rex & bad32) || ins->vexreg > 7)) {
errfunc(ERR_NONFATAL, "invalid operands in non-64-bit mode");
return -1;
} else if (!(ins->rex & REX_EV) &&
((ins->vexreg > 15) || (ins->evex_p[0] & 0xf0))) {
errfunc(ERR_NONFATAL, "invalid high-16 register in non-AVX-512");
return -1;
}
if (ins->rex & REX_EV)
length += 4;
else if (ins->vex_cm != 1 || (ins->rex & (REX_W|REX_X|REX_B)))
length += 3;
else
length += 2;
} else if (ins->rex & REX_REAL) {
if (ins->rex & REX_H) {
errfunc(ERR_NONFATAL, "cannot use high register in rex instruction");
return -1;
} else if (bits == 64) {
length++;
} else if ((ins->rex & REX_L) &&
!(ins->rex & (REX_P|REX_W|REX_X|REX_B)) &&
cpu >= IF_X86_64) {
/* LOCK-as-REX.R */
assert_no_prefix(ins, PPS_LOCK);
lockcheck = false; /* Already errored, no need for warning */
length++;
} else {
errfunc(ERR_NONFATAL, "invalid operands in non-64-bit mode");
return -1;
}
}
if (has_prefix(ins, PPS_LOCK, P_LOCK) && lockcheck &&
(!(temp->flags & IF_LOCK) || !is_class(MEMORY, ins->oprs[0].type))) {
errfunc(ERR_WARNING | ERR_WARN_LOCK | ERR_PASS2 ,
"instruction is not lockable");
}
bad_hle_warn(ins, hleok);
return length;
}
static inline unsigned int emit_rex(insn *ins, int32_t segment, int64_t offset, int bits)
{
if (bits == 64) {
if ((ins->rex & REX_REAL) && !(ins->rex & (REX_V | REX_EV))) {
ins->rex = (ins->rex & REX_REAL) | REX_P;
out(offset, segment, &ins->rex, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
ins->rex = 0;
return 1;
}
}
return 0;
}
static void gencode(int32_t segment, int64_t offset, int bits,
insn * ins, const struct itemplate *temp,
int64_t insn_end)
{
uint8_t c;
uint8_t bytes[4];
int64_t size;
int64_t data;
int op1, op2;
struct operand *opx;
const uint8_t *codes = temp->code;
uint8_t opex = 0;
enum ea_type eat = EA_SCALAR;
while (*codes) {
c = *codes++;
op1 = (c & 3) + ((opex & 1) << 2);
op2 = ((c >> 3) & 3) + ((opex & 2) << 1);
opx = &ins->oprs[op1];
opex = 0; /* For the next iteration */
switch (c) {
case 01:
case 02:
case 03:
case 04:
offset += emit_rex(ins, segment, offset, bits);
out(offset, segment, codes, OUT_RAWDATA, c, NO_SEG, NO_SEG);
codes += c;
offset += c;
break;
case 05:
case 06:
case 07:
opex = c;
break;
case4(010):
offset += emit_rex(ins, segment, offset, bits);
bytes[0] = *codes++ + (regval(opx) & 7);
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
offset += 1;
break;
case4(020):
if (opx->offset < -256 || opx->offset > 255) {
errfunc(ERR_WARNING | ERR_PASS2 | ERR_WARN_NOV,
"byte value exceeds bounds");
}
out_imm8(offset, segment, opx);
offset += 1;
break;
case4(024):
if (opx->offset < 0 || opx->offset > 255)
errfunc(ERR_WARNING | ERR_PASS2 | ERR_WARN_NOV,
"unsigned byte value exceeds bounds");
out_imm8(offset, segment, opx);
offset += 1;
break;
case4(030):
warn_overflow_opd(opx, 2);
data = opx->offset;
out(offset, segment, &data, OUT_ADDRESS, 2,
opx->segment, opx->wrt);
offset += 2;
break;
case4(034):
if (opx->type & (BITS16 | BITS32))
size = (opx->type & BITS16) ? 2 : 4;
else
size = (bits == 16) ? 2 : 4;
warn_overflow_opd(opx, size);
data = opx->offset;
out(offset, segment, &data, OUT_ADDRESS, size,
opx->segment, opx->wrt);
offset += size;
break;
case4(040):
warn_overflow_opd(opx, 4);
data = opx->offset;
out(offset, segment, &data, OUT_ADDRESS, 4,
opx->segment, opx->wrt);
offset += 4;
break;
case4(044):
data = opx->offset;
size = ins->addr_size >> 3;
warn_overflow_opd(opx, size);
out(offset, segment, &data, OUT_ADDRESS, size,
opx->segment, opx->wrt);
offset += size;
break;
case4(050):
if (opx->segment != segment) {
data = opx->offset;
out(offset, segment, &data,
OUT_REL1ADR, insn_end - offset,
opx->segment, opx->wrt);
} else {
data = opx->offset - insn_end;
if (data > 127 || data < -128)
errfunc(ERR_NONFATAL, "short jump is out of range");
out(offset, segment, &data,
OUT_ADDRESS, 1, NO_SEG, NO_SEG);
}
offset += 1;
break;
case4(054):
data = (int64_t)opx->offset;
out(offset, segment, &data, OUT_ADDRESS, 8,
opx->segment, opx->wrt);
offset += 8;
break;
case4(060):
if (opx->segment != segment) {
data = opx->offset;
out(offset, segment, &data,
OUT_REL2ADR, insn_end - offset,
opx->segment, opx->wrt);
} else {
data = opx->offset - insn_end;
out(offset, segment, &data,
OUT_ADDRESS, 2, NO_SEG, NO_SEG);
}
offset += 2;
break;
case4(064):
if (opx->type & (BITS16 | BITS32 | BITS64))
size = (opx->type & BITS16) ? 2 : 4;
else
size = (bits == 16) ? 2 : 4;
if (opx->segment != segment) {
data = opx->offset;
out(offset, segment, &data,
size == 2 ? OUT_REL2ADR : OUT_REL4ADR,
insn_end - offset, opx->segment, opx->wrt);
} else {
data = opx->offset - insn_end;
out(offset, segment, &data,
OUT_ADDRESS, size, NO_SEG, NO_SEG);
}
offset += size;
break;
case4(070):
if (opx->segment != segment) {
data = opx->offset;
out(offset, segment, &data,
OUT_REL4ADR, insn_end - offset,
opx->segment, opx->wrt);
} else {
data = opx->offset - insn_end;
out(offset, segment, &data,
OUT_ADDRESS, 4, NO_SEG, NO_SEG);
}
offset += 4;
break;
case4(074):
if (opx->segment == NO_SEG)
errfunc(ERR_NONFATAL, "value referenced by FAR is not"
" relocatable");
data = 0;
out(offset, segment, &data, OUT_ADDRESS, 2,
outfmt->segbase(1 + opx->segment),
opx->wrt);
offset += 2;
break;
case 0172:
c = *codes++;
opx = &ins->oprs[c >> 3];
bytes[0] = nasm_regvals[opx->basereg] << 4;
opx = &ins->oprs[c & 7];
if (opx->segment != NO_SEG || opx->wrt != NO_SEG) {
errfunc(ERR_NONFATAL,
"non-absolute expression not permitted as argument %d",
c & 7);
} else {
if (opx->offset & ~15) {
errfunc(ERR_WARNING | ERR_PASS2 | ERR_WARN_NOV,
"four-bit argument exceeds bounds");
}
bytes[0] |= opx->offset & 15;
}
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
offset++;
break;
case 0173:
c = *codes++;
opx = &ins->oprs[c >> 4];
bytes[0] = nasm_regvals[opx->basereg] << 4;
bytes[0] |= c & 15;
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
offset++;
break;
case4(0174):
bytes[0] = nasm_regvals[opx->basereg] << 4;
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
offset++;
break;
case4(0254):
data = opx->offset;
if (opx->wrt == NO_SEG && opx->segment == NO_SEG &&
(int32_t)data != (int64_t)data) {
errfunc(ERR_WARNING | ERR_PASS2 | ERR_WARN_NOV,
"signed dword immediate exceeds bounds");
}
out(offset, segment, &data, OUT_ADDRESS, 4,
opx->segment, opx->wrt);
offset += 4;
break;
case4(0240):
case 0250:
codes += 3;
ins->evex_p[2] |= op_evexflags(&ins->oprs[0],
EVEX_P2Z | EVEX_P2AAA, 2);
ins->evex_p[2] ^= EVEX_P2VP; /* 1's complement */
bytes[0] = 0x62;
/* EVEX.X can be set by either REX or EVEX for different reasons */
bytes[1] = (~(((ins->rex & 7) << 5) |
(ins->evex_p[0] & (EVEX_P0X | EVEX_P0RP))) & 0xf0) |
(ins->vex_cm & 3);
bytes[2] = ((ins->rex & REX_W) << (7 - 3)) |
((~ins->vexreg & 15) << 3) |
(1 << 2) | (ins->vex_wlp & 3);
bytes[3] = ins->evex_p[2];
out(offset, segment, &bytes, OUT_RAWDATA, 4, NO_SEG, NO_SEG);
offset += 4;
break;
case4(0260):
case 0270:
codes += 2;
if (ins->vex_cm != 1 || (ins->rex & (REX_W|REX_X|REX_B))) {
bytes[0] = (ins->vex_cm >> 6) ? 0x8f : 0xc4;
bytes[1] = (ins->vex_cm & 31) | ((~ins->rex & 7) << 5);
bytes[2] = ((ins->rex & REX_W) << (7-3)) |
((~ins->vexreg & 15)<< 3) | (ins->vex_wlp & 07);
out(offset, segment, &bytes, OUT_RAWDATA, 3, NO_SEG, NO_SEG);
offset += 3;
} else {
bytes[0] = 0xc5;
bytes[1] = ((~ins->rex & REX_R) << (7-2)) |
((~ins->vexreg & 15) << 3) | (ins->vex_wlp & 07);
out(offset, segment, &bytes, OUT_RAWDATA, 2, NO_SEG, NO_SEG);
offset += 2;
}
break;
case 0271:
case 0272:
case 0273:
break;
case4(0274):
{
uint64_t uv, um;
int s;
if (ins->rex & REX_W)
s = 64;
else if (ins->prefixes[PPS_OSIZE] == P_O16)
s = 16;
else if (ins->prefixes[PPS_OSIZE] == P_O32)
s = 32;
else
s = bits;
um = (uint64_t)2 << (s-1);
uv = opx->offset;
if (uv > 127 && uv < (uint64_t)-128 &&
(uv < um-128 || uv > um-1)) {
/* If this wasn't explicitly byte-sized, warn as though we
* had fallen through to the imm16/32/64 case.
*/
errfunc(ERR_WARNING | ERR_PASS2 | ERR_WARN_NOV,
"%s value exceeds bounds",
(opx->type & BITS8) ? "signed byte" :
s == 16 ? "word" :
s == 32 ? "dword" :
"signed dword");
}
if (opx->segment != NO_SEG) {
data = uv;
out(offset, segment, &data, OUT_ADDRESS, 1,
opx->segment, opx->wrt);
} else {
bytes[0] = uv;
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG,
NO_SEG);
}
offset += 1;
break;
}
case4(0300):
break;
case 0310:
if (bits == 32 && !has_prefix(ins, PPS_ASIZE, P_A16)) {
*bytes = 0x67;
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
offset += 1;
} else
offset += 0;
break;
case 0311:
if (bits != 32 && !has_prefix(ins, PPS_ASIZE, P_A32)) {
*bytes = 0x67;
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
offset += 1;
} else
offset += 0;
break;
case 0312:
break;
case 0313:
ins->rex = 0;
break;
case4(0314):
break;
case 0320:
case 0321:
break;
case 0322:
case 0323:
break;
case 0324:
ins->rex |= REX_W;
break;
case 0325:
break;
case 0326:
break;
case 0330:
*bytes = *codes++ ^ get_cond_opcode(ins->condition);
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
offset += 1;
break;
case 0331:
break;
case 0332:
case 0333:
*bytes = c - 0332 + 0xF2;
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
offset += 1;
break;
case 0334:
if (ins->rex & REX_R) {
*bytes = 0xF0;
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
offset += 1;
}
ins->rex &= ~(REX_L|REX_R);
break;
case 0335:
break;
case 0336:
case 0337:
break;
case 0340:
if (ins->oprs[0].segment != NO_SEG)
errfunc(ERR_PANIC, "non-constant BSS size in pass two");
else {
int64_t size = ins->oprs[0].offset;
if (size > 0)
out(offset, segment, NULL,
OUT_RESERVE, size, NO_SEG, NO_SEG);
offset += size;
}
break;
case 0341:
break;
case 0360:
break;
case 0361:
bytes[0] = 0x66;
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
offset += 1;
break;
case 0364:
case 0365:
break;
case 0366:
case 0367:
*bytes = c - 0366 + 0x66;
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
offset += 1;
break;
case 0370:
case 0371:
break;
case 0373:
*bytes = bits == 16 ? 3 : 5;
out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG, NO_SEG);
offset += 1;
break;
case 0374:
eat = EA_XMMVSIB;
break;
case 0375:
eat = EA_YMMVSIB;
break;
case 0376:
eat = EA_ZMMVSIB;
break;
case4(0100):
case4(0110):
case4(0120):
case4(0130):
case4(0200):
case4(0204):
case4(0210):
case4(0214):
case4(0220):
case4(0224):
case4(0230):
case4(0234):
{
ea ea_data;
int rfield;
opflags_t rflags;
uint8_t *p;
int32_t s;
struct operand *opy = &ins->oprs[op2];
if (c <= 0177) {
/* pick rfield from operand b (opx) */
rflags = regflag(opx);
rfield = nasm_regvals[opx->basereg];
} else {
/* rfield is constant */
rflags = 0;
rfield = c & 7;
}
if (process_ea(opy, &ea_data, bits,
rfield, rflags, ins) != eat)
errfunc(ERR_NONFATAL, "invalid effective address");
p = bytes;
*p++ = ea_data.modrm;
if (ea_data.sib_present)
*p++ = ea_data.sib;
s = p - bytes;
out(offset, segment, bytes, OUT_RAWDATA, s, NO_SEG, NO_SEG);
/*
* Make sure the address gets the right offset in case
* the line breaks in the .lst file (BR 1197827)
*/
offset += s;
s = 0;
switch (ea_data.bytes) {
case 0:
break;
case 1:
case 2:
case 4:
case 8:
/* use compressed displacement, if available */
data = ea_data.disp8 ? ea_data.disp8 : opy->offset;
s += ea_data.bytes;
if (ea_data.rip) {
if (opy->segment == segment) {
data -= insn_end;
if (overflow_signed(data, ea_data.bytes))
warn_overflow(ERR_PASS2, ea_data.bytes);
out(offset, segment, &data, OUT_ADDRESS,
ea_data.bytes, NO_SEG, NO_SEG);
} else {
/* overflow check in output/linker? */
out(offset, segment, &data, OUT_REL4ADR,
insn_end - offset, opy->segment, opy->wrt);
}
} else {
if (overflow_general(data, ins->addr_size >> 3) ||
signed_bits(data, ins->addr_size) !=
signed_bits(data, ea_data.bytes * 8))
warn_overflow(ERR_PASS2, ea_data.bytes);
out(offset, segment, &data, OUT_ADDRESS,
ea_data.bytes, opy->segment, opy->wrt);
}
break;
default:
/* Impossible! */
errfunc(ERR_PANIC,
"Invalid amount of bytes (%d) for offset?!",
ea_data.bytes);
break;
}
offset += s;
}
break;
default:
errfunc(ERR_PANIC, "internal instruction table corrupt"
": instruction code \\%o (0x%02X) given", c, c);
break;
}
}
}
static opflags_t regflag(const operand * o)
{
if (!is_register(o->basereg))
errfunc(ERR_PANIC, "invalid operand passed to regflag()");
return nasm_reg_flags[o->basereg];
}
static int32_t regval(const operand * o)
{
if (!is_register(o->basereg))
errfunc(ERR_PANIC, "invalid operand passed to regval()");
return nasm_regvals[o->basereg];
}
static int op_rexflags(const operand * o, int mask)
{
opflags_t flags;
int val;
if (!is_register(o->basereg))
errfunc(ERR_PANIC, "invalid operand passed to op_rexflags()");
flags = nasm_reg_flags[o->basereg];
val = nasm_regvals[o->basereg];
return rexflags(val, flags, mask);
}
static int rexflags(int val, opflags_t flags, int mask)
{
int rex = 0;
if (val >= 8)
rex |= REX_B|REX_X|REX_R;
if (flags & BITS64)
rex |= REX_W;
if (!(REG_HIGH & ~flags)) /* AH, CH, DH, BH */
rex |= REX_H;
else if (!(REG8 & ~flags) && val >= 4) /* SPL, BPL, SIL, DIL */
rex |= REX_P;
return rex & mask;
}
static int evexflags(int val, decoflags_t deco,
int mask, uint8_t byte)
{
int evex = 0;
switch(byte) {
case 0:
if (val >= 16)
evex |= (EVEX_P0RP | EVEX_P0X);
break;
case 2:
if (val >= 16)
evex |= EVEX_P2VP;
if (deco & Z)
evex |= EVEX_P2Z;
if (deco & OPMASK_MASK)
evex |= deco & EVEX_P2AAA;
break;
}
return evex & mask;
}
static int op_evexflags(const operand * o, int mask, uint8_t byte)
{
int val;
if (!is_register(o->basereg))
errfunc(ERR_PANIC, "invalid operand passed to op_evexflags()");
val = nasm_regvals[o->basereg];
return evexflags(val, o->decoflags, mask, byte);
}
static enum match_result find_match(const struct itemplate **tempp,
insn *instruction,
int32_t segment, int64_t offset, int bits)
{
const struct itemplate *temp;
enum match_result m, merr;
opflags_t xsizeflags[MAX_OPERANDS];
bool opsizemissing = false;
int8_t broadcast = instruction->evex_brerop;
int i;
/* broadcasting uses a different data element size */
for (i = 0; i < instruction->operands; i++)
if (i == broadcast)
xsizeflags[i] = instruction->oprs[i].decoflags & BRSIZE_MASK;
else
xsizeflags[i] = instruction->oprs[i].type & SIZE_MASK;
merr = MERR_INVALOP;
for (temp = nasm_instructions[instruction->opcode];
temp->opcode != I_none; temp++) {
m = matches(temp, instruction, bits);
if (m == MOK_JUMP) {
if (jmp_match(segment, offset, bits, instruction, temp))
m = MOK_GOOD;
else
m = MERR_INVALOP;
} else if (m == MERR_OPSIZEMISSING &&
(temp->flags & IF_SMASK) != IF_SX) {
/*
* Missing operand size and a candidate for fuzzy matching...
*/
for (i = 0; i < temp->operands; i++)
if (i == broadcast)
xsizeflags[i] |= temp->deco[i] & BRSIZE_MASK;
else
xsizeflags[i] |= temp->opd[i] & SIZE_MASK;
opsizemissing = true;
}
if (m > merr)
merr = m;
if (merr == MOK_GOOD)
goto done;
}
/* No match, but see if we can get a fuzzy operand size match... */
if (!opsizemissing)
goto done;
for (i = 0; i < instruction->operands; i++) {
/*
* We ignore extrinsic operand sizes on registers, so we should
* never try to fuzzy-match on them. This also resolves the case
* when we have e.g. "xmmrm128" in two different positions.
*/
if (is_class(REGISTER, instruction->oprs[i].type))
continue;
/* This tests if xsizeflags[i] has more than one bit set */
if ((xsizeflags[i] & (xsizeflags[i]-1)))
goto done; /* No luck */
if (i == broadcast)
instruction->oprs[i].decoflags |= xsizeflags[i];
else
instruction->oprs[i].type |= xsizeflags[i]; /* Set the size */
}
/* Try matching again... */
for (temp = nasm_instructions[instruction->opcode];
temp->opcode != I_none; temp++) {
m = matches(temp, instruction, bits);
if (m == MOK_JUMP) {
if (jmp_match(segment, offset, bits, instruction, temp))
m = MOK_GOOD;
else
m = MERR_INVALOP;
}
if (m > merr)
merr = m;
if (merr == MOK_GOOD)
goto done;
}
done:
*tempp = temp;
return merr;
}
static enum match_result matches(const struct itemplate *itemp,
insn *instruction, int bits)
{
opflags_t size[MAX_OPERANDS], asize;
bool opsizemissing = false;
int i, oprs;
/*
* Check the opcode
*/
if (itemp->opcode != instruction->opcode)
return MERR_INVALOP;
/*
* Count the operands
*/
if (itemp->operands != instruction->operands)
return MERR_INVALOP;
/*
* Is it legal?
*/
if (!(optimizing > 0) && (itemp->flags & IF_OPT))
return MERR_INVALOP;
/*
* Check that no spurious colons or TOs are present
*/
for (i = 0; i < itemp->operands; i++)
if (instruction->oprs[i].type & ~itemp->opd[i] & (COLON | TO))
return MERR_INVALOP;
/*
* Process size flags
*/
switch (itemp->flags & IF_SMASK) {
case IF_SB:
asize = BITS8;
break;
case IF_SW:
asize = BITS16;
break;
case IF_SD:
asize = BITS32;
break;
case IF_SQ:
asize = BITS64;
break;
case IF_SO:
asize = BITS128;
break;
case IF_SY:
asize = BITS256;
break;
case IF_SZ:
asize = BITS512;
break;
case IF_SIZE:
switch (bits) {
case 16:
asize = BITS16;
break;
case 32:
asize = BITS32;
break;
case 64:
asize = BITS64;
break;
default:
asize = 0;
break;
}
break;
default:
asize = 0;
break;
}
if (itemp->flags & IF_ARMASK) {
/* S- flags only apply to a specific operand */
i = ((itemp->flags & IF_ARMASK) >> IF_ARSHFT) - 1;
memset(size, 0, sizeof size);
size[i] = asize;
} else {
/* S- flags apply to all operands */
for (i = 0; i < MAX_OPERANDS; i++)
size[i] = asize;
}
/*
* Check that the operand flags all match up,
* it's a bit tricky so lets be verbose:
*
* 1) Find out the size of operand. If instruction
* doesn't have one specified -- we're trying to
* guess it either from template (IF_S* flag) or
* from code bits.
*
* 2) If template operand do not match the instruction OR
* template has an operand size specified AND this size differ
* from which instruction has (perhaps we got it from code bits)
* we are:
* a) Check that only size of instruction and operand is differ
* other characteristics do match
* b) Perhaps it's a register specified in instruction so
* for such a case we just mark that operand as "size
* missing" and this will turn on fuzzy operand size
* logic facility (handled by a caller)
*/
for (i = 0; i < itemp->operands; i++) {
opflags_t type = instruction->oprs[i].type;
decoflags_t deco = instruction->oprs[i].decoflags;
if (!(type & SIZE_MASK))
type |= size[i];
if ((itemp->opd[i] & ~type & ~SIZE_MASK) ||
(itemp->deco[i] & deco) != deco) {
return MERR_INVALOP;
} else if ((itemp->opd[i] & SIZE_MASK) &&
(itemp->opd[i] & SIZE_MASK) != (type & SIZE_MASK)) {
if (type & SIZE_MASK) {
/*
* when broadcasting, the element size depends on
* the instruction type. decorator flag should match.
*/
#define MATCH_BRSZ(bits) (((type & SIZE_MASK) == BITS##bits) && \
((itemp->deco[i] & BRSIZE_MASK) == BR_BITS##bits))
if (!((deco & BRDCAST_MASK) &&
(MATCH_BRSZ(32) || MATCH_BRSZ(64)))) {
return MERR_INVALOP;
}
} else if (!is_class(REGISTER, type)) {
/*
* Note: we don't honor extrinsic operand sizes for registers,
* so "missing operand size" for a register should be
* considered a wildcard match rather than an error.
*/
opsizemissing = true;
}
} else if (is_register(instruction->oprs[i].basereg) &&
nasm_regvals[instruction->oprs[i].basereg] >= 16 &&
!(itemp->flags & IF_AVX512)) {
return MERR_ENCMISMATCH;
}
}
if (opsizemissing)
return MERR_OPSIZEMISSING;
/*
* Check operand sizes
*/
if (itemp->flags & (IF_SM | IF_SM2)) {
oprs = (itemp->flags & IF_SM2 ? 2 : itemp->operands);
for (i = 0; i < oprs; i++) {
asize = itemp->opd[i] & SIZE_MASK;
if (asize) {
for (i = 0; i < oprs; i++)
size[i] = asize;
break;
}
}
} else {
oprs = itemp->operands;
}
for (i = 0; i < itemp->operands; i++) {
if (!(itemp->opd[i] & SIZE_MASK) &&
(instruction->oprs[i].type & SIZE_MASK & ~size[i]))
return MERR_OPSIZEMISMATCH;
}
/*
* Check template is okay at the set cpu level
*/
if (((itemp->flags & IF_PLEVEL) > cpu))
return MERR_BADCPU;
/*
* Verify the appropriate long mode flag.
*/
if ((itemp->flags & (bits == 64 ? IF_NOLONG : IF_LONG)))
return MERR_BADMODE;
/*
* If we have a HLE prefix, look for the NOHLE flag
*/
if ((itemp->flags & IF_NOHLE) &&
(has_prefix(instruction, PPS_REP, P_XACQUIRE) ||
has_prefix(instruction, PPS_REP, P_XRELEASE)))
return MERR_BADHLE;
/*
* Check if special handling needed for Jumps
*/
if ((itemp->code[0] & ~1) == 0370)
return MOK_JUMP;
return MOK_GOOD;
}
/*
* Check if offset is a multiple of N with corresponding tuple type
* if Disp8*N is available, compressed displacement is stored in compdisp
*/
static bool is_disp8n(operand *input, insn *ins, int8_t *compdisp)
{
const uint8_t fv_n[2][2][VLMAX] = {{{16, 32, 64}, {4, 4, 4}},
{{16, 32, 64}, {8, 8, 8}}};
const uint8_t hv_n[2][VLMAX] = {{8, 16, 32}, {4, 4, 4}};
const uint8_t dup_n[VLMAX] = {8, 32, 64};
bool evex_b = input->decoflags & BRDCAST_MASK;
enum ttypes tuple = ins->evex_tuple;
/* vex_wlp composed as [wwllpp] */
enum vectlens vectlen = (ins->vex_wlp & 0x0c) >> 2;
/* wig(=2) is treated as w0(=0) */
bool evex_w = (ins->vex_wlp & 0x10) >> 4;
int32_t off = input->offset;
uint8_t n = 0;
int32_t disp8;
switch(tuple) {
case FV:
n = fv_n[evex_w][evex_b][vectlen];
break;
case HV:
n = hv_n[evex_b][vectlen];
break;
case FVM:
/* 16, 32, 64 for VL 128, 256, 512 respectively*/
n = 1 << (vectlen + 4);
break;
case T1S8: /* N = 1 */
case T1S16: /* N = 2 */
n = tuple - T1S8 + 1;
break;
case T1S:
/* N = 4 for 32bit, 8 for 64bit */
n = evex_w ? 8 : 4;
break;
case T1F32:
case T1F64:
/* N = 4 for 32bit, 8 for 64bit */
n = (tuple == T1F32 ? 4 : 8);
break;
case T2:
case T4:
case T8:
if (vectlen + 7 <= (evex_w + 5) + (tuple - T2 + 1))
n = 0;
else
n = 1 << (tuple - T2 + evex_w + 3);
break;
case HVM:
case QVM:
case OVM:
n = 1 << (OVM - tuple + vectlen + 1);
break;
case M128:
n = 16;
break;
case DUP:
n = dup_n[vectlen];
break;
default:
break;
}
if (n && !(off & (n - 1))) {
disp8 = off / n;
/* if it fits in Disp8 */
if (disp8 >= -128 && disp8 <= 127) {
*compdisp = disp8;
return true;
}
}
*compdisp = 0;
return false;
}
/*
* Check if ModR/M.mod should/can be 01.
* - EAF_BYTEOFFS is set
* - offset can fit in a byte when EVEX is not used
* - offset can be compressed when EVEX is used
*/
#define IS_MOD_01() (input->eaflags & EAF_BYTEOFFS || \
(o >= -128 && o <= 127 && \
seg == NO_SEG && !forw_ref && \
!(input->eaflags & EAF_WORDOFFS) && \
!(ins->rex & REX_EV)) || \
(ins->rex & REX_EV && \
is_disp8n(input, ins, &output->disp8)))
static enum ea_type process_ea(operand *input, ea *output, int bits,
int rfield, opflags_t rflags, insn *ins)
{
bool forw_ref = !!(input->opflags & OPFLAG_UNKNOWN);
int addrbits = ins->addr_size;
output->type = EA_SCALAR;
output->rip = false;
output->disp8 = 0;
/* REX flags for the rfield operand */
output->rex |= rexflags(rfield, rflags, REX_R | REX_P | REX_W | REX_H);
/* EVEX.R' flag for the REG operand */
ins->evex_p[0] |= evexflags(rfield, 0, EVEX_P0RP, 0);
if (is_class(REGISTER, input->type)) {
/*
* It's a direct register.
*/
if (!is_register(input->basereg))
goto err;
if (!is_reg_class(REG_EA, input->basereg))
goto err;
/* broadcasting is not available with a direct register operand. */
if (input->decoflags & BRDCAST_MASK) {
nasm_error(ERR_NONFATAL, "Broadcasting not allowed from a register");
goto err;
}
output->rex |= op_rexflags(input, REX_B | REX_P | REX_W | REX_H);
ins->evex_p[0] |= op_evexflags(input, EVEX_P0X, 0);
output->sib_present = false; /* no SIB necessary */
output->bytes = 0; /* no offset necessary either */
output->modrm = GEN_MODRM(3, rfield, nasm_regvals[input->basereg]);
} else {
/*
* It's a memory reference.
*/
/* Embedded rounding or SAE is not available with a mem ref operand. */
if (input->decoflags & (ER | SAE)) {
nasm_error(ERR_NONFATAL,
"Embedded rounding is available only with reg-reg op.");
return -1;
}
if (input->basereg == -1 &&
(input->indexreg == -1 || input->scale == 0)) {
/*
* It's a pure offset.
*/
if (bits == 64 && ((input->type & IP_REL) == IP_REL) &&
input->segment == NO_SEG) {
nasm_error(ERR_WARNING | ERR_PASS1, "absolute address can not be RIP-relative");
input->type &= ~IP_REL;
input->type |= MEMORY;
}
if (input->eaflags & EAF_BYTEOFFS ||
(input->eaflags & EAF_WORDOFFS &&
input->disp_size != (addrbits != 16 ? 32 : 16))) {
nasm_error(ERR_WARNING | ERR_PASS1, "displacement size ignored on absolute address");
}
if (bits == 64 && (~input->type & IP_REL)) {
output->sib_present = true;
output->sib = GEN_SIB(0, 4, 5);
output->bytes = 4;
output->modrm = GEN_MODRM(0, rfield, 4);
output->rip = false;
} else {
output->sib_present = false;
output->bytes = (addrbits != 16 ? 4 : 2);
output->modrm = GEN_MODRM(0, rfield, (addrbits != 16 ? 5 : 6));
output->rip = bits == 64;
}
} else {
/*
* It's an indirection.
*/
int i = input->indexreg, b = input->basereg, s = input->scale;
int32_t seg = input->segment;
int hb = input->hintbase, ht = input->hinttype;
int t, it, bt; /* register numbers */
opflags_t x, ix, bx; /* register flags */
if (s == 0)
i = -1; /* make this easy, at least */
if (is_register(i)) {
it = nasm_regvals[i];
ix = nasm_reg_flags[i];
} else {
it = -1;
ix = 0;
}
if (is_register(b)) {
bt = nasm_regvals[b];
bx = nasm_reg_flags[b];
} else {
bt = -1;
bx = 0;
}
/* if either one are a vector register... */
if ((ix|bx) & (XMMREG|YMMREG|ZMMREG) & ~REG_EA) {
opflags_t sok = BITS32 | BITS64;
int32_t o = input->offset;
int mod, scale, index, base;
/*
* For a vector SIB, one has to be a vector and the other,
* if present, a GPR. The vector must be the index operand.
*/
if (it == -1 || (bx & (XMMREG|YMMREG|ZMMREG) & ~REG_EA)) {
if (s == 0)
s = 1;
else if (s != 1)
goto err;
t = bt, bt = it, it = t;
x = bx, bx = ix, ix = x;
}
if (bt != -1) {
if (REG_GPR & ~bx)
goto err;
if (!(REG64 & ~bx) || !(REG32 & ~bx))
sok &= bx;
else
goto err;
}
/*
* While we're here, ensure the user didn't specify
* WORD or QWORD
*/
if (input->disp_size == 16 || input->disp_size == 64)
goto err;
if (addrbits == 16 ||
(addrbits == 32 && !(sok & BITS32)) ||
(addrbits == 64 && !(sok & BITS64)))
goto err;
output->type = ((ix & ZMMREG & ~REG_EA) ? EA_ZMMVSIB
: ((ix & YMMREG & ~REG_EA)
? EA_YMMVSIB : EA_XMMVSIB));
output->rex |= rexflags(it, ix, REX_X);
output->rex |= rexflags(bt, bx, REX_B);
ins->evex_p[2] |= evexflags(it, 0, EVEX_P2VP, 2);
index = it & 7; /* it is known to be != -1 */
switch (s) {
case 1:
scale = 0;
break;
case 2:
scale = 1;
break;
case 4:
scale = 2;
break;
case 8:
scale = 3;
break;
default: /* then what the smeg is it? */
goto err; /* panic */
}
if (bt == -1) {
base = 5;
mod = 0;
} else {
base = (bt & 7);
if (base != REG_NUM_EBP && o == 0 &&
seg == NO_SEG && !forw_ref &&
!(input->eaflags & (EAF_BYTEOFFS | EAF_WORDOFFS)))
mod = 0;
else if (IS_MOD_01())
mod = 1;
else
mod = 2;
}
output->sib_present = true;
output->bytes = (bt == -1 || mod == 2 ? 4 : mod);
output->modrm = GEN_MODRM(mod, rfield, 4);
output->sib = GEN_SIB(scale, index, base);
} else if ((ix|bx) & (BITS32|BITS64)) {
/*
* it must be a 32/64-bit memory reference. Firstly we have
* to check that all registers involved are type E/Rxx.
*/
opflags_t sok = BITS32 | BITS64;
int32_t o = input->offset;
if (it != -1) {
if (!(REG64 & ~ix) || !(REG32 & ~ix))
sok &= ix;
else
goto err;
}
if (bt != -1) {
if (REG_GPR & ~bx)
goto err; /* Invalid register */
if (~sok & bx & SIZE_MASK)
goto err; /* Invalid size */
sok &= bx;
}
/*
* While we're here, ensure the user didn't specify
* WORD or QWORD
*/
if (input->disp_size == 16 || input->disp_size == 64)
goto err;
if (addrbits == 16 ||
(addrbits == 32 && !(sok & BITS32)) ||
(addrbits == 64 && !(sok & BITS64)))
goto err;
/* now reorganize base/index */
if (s == 1 && bt != it && bt != -1 && it != -1 &&
((hb == b && ht == EAH_NOTBASE) ||
(hb == i && ht == EAH_MAKEBASE))) {
/* swap if hints say so */
t = bt, bt = it, it = t;
x = bx, bx = ix, ix = x;
}
if (bt == it) /* convert EAX+2*EAX to 3*EAX */
bt = -1, bx = 0, s++;
if (bt == -1 && s == 1 && !(hb == it && ht == EAH_NOTBASE)) {
/* make single reg base, unless hint */
bt = it, bx = ix, it = -1, ix = 0;
}
if (((s == 2 && it != REG_NUM_ESP && !(input->eaflags & EAF_TIMESTWO)) ||
s == 3 || s == 5 || s == 9) && bt == -1)
bt = it, bx = ix, s--; /* convert 3*EAX to EAX+2*EAX */
if (it == -1 && (bt & 7) != REG_NUM_ESP &&
(input->eaflags & EAF_TIMESTWO))
it = bt, ix = bx, bt = -1, bx = 0, s = 1;
/* convert [NOSPLIT EAX] to sib format with 0x0 displacement */
if (s == 1 && it == REG_NUM_ESP) {
/* swap ESP into base if scale is 1 */
t = it, it = bt, bt = t;
x = ix, ix = bx, bx = x;
}
if (it == REG_NUM_ESP ||
(s != 1 && s != 2 && s != 4 && s != 8 && it != -1))
goto err; /* wrong, for various reasons */
output->rex |= rexflags(it, ix, REX_X);
output->rex |= rexflags(bt, bx, REX_B);
if (it == -1 && (bt & 7) != REG_NUM_ESP) {
/* no SIB needed */
int mod, rm;
if (bt == -1) {
rm = 5;
mod = 0;
} else {
rm = (bt & 7);
if (rm != REG_NUM_EBP && o == 0 &&
seg == NO_SEG && !forw_ref &&
!(input->eaflags & (EAF_BYTEOFFS | EAF_WORDOFFS)))
mod = 0;
else if (IS_MOD_01())
mod = 1;
else
mod = 2;
}
output->sib_present = false;
output->bytes = (bt == -1 || mod == 2 ? 4 : mod);
output->modrm = GEN_MODRM(mod, rfield, rm);
} else {
/* we need a SIB */
int mod, scale, index, base;
if (it == -1)
index = 4, s = 1;
else
index = (it & 7);
switch (s) {
case 1:
scale = 0;
break;
case 2:
scale = 1;
break;
case 4:
scale = 2;
break;
case 8:
scale = 3;
break;
default: /* then what the smeg is it? */
goto err; /* panic */
}
if (bt == -1) {
base = 5;
mod = 0;
} else {
base = (bt & 7);
if (base != REG_NUM_EBP && o == 0 &&
seg == NO_SEG && !forw_ref &&
!(input->eaflags & (EAF_BYTEOFFS | EAF_WORDOFFS)))
mod = 0;
else if (IS_MOD_01())
mod = 1;
else
mod = 2;
}
output->sib_present = true;
output->bytes = (bt == -1 || mod == 2 ? 4 : mod);
output->modrm = GEN_MODRM(mod, rfield, 4);
output->sib = GEN_SIB(scale, index, base);
}
} else { /* it's 16-bit */
int mod, rm;
int16_t o = input->offset;
/* check for 64-bit long mode */
if (addrbits == 64)
goto err;
/* check all registers are BX, BP, SI or DI */
if ((b != -1 && b != R_BP && b != R_BX && b != R_SI && b != R_DI) ||
(i != -1 && i != R_BP && i != R_BX && i != R_SI && i != R_DI))
goto err;
/* ensure the user didn't specify DWORD/QWORD */
if (input->disp_size == 32 || input->disp_size == 64)
goto err;
if (s != 1 && i != -1)
goto err; /* no can do, in 16-bit EA */
if (b == -1 && i != -1) {
int tmp = b;
b = i;
i = tmp;
} /* swap */
if ((b == R_SI || b == R_DI) && i != -1) {
int tmp = b;
b = i;
i = tmp;
}
/* have BX/BP as base, SI/DI index */
if (b == i)
goto err; /* shouldn't ever happen, in theory */
if (i != -1 && b != -1 &&
(i == R_BP || i == R_BX || b == R_SI || b == R_DI))
goto err; /* invalid combinations */
if (b == -1) /* pure offset: handled above */
goto err; /* so if it gets to here, panic! */
rm = -1;
if (i != -1)
switch (i * 256 + b) {
case R_SI * 256 + R_BX:
rm = 0;
break;
case R_DI * 256 + R_BX:
rm = 1;
break;
case R_SI * 256 + R_BP:
rm = 2;
break;
case R_DI * 256 + R_BP:
rm = 3;
break;
} else
switch (b) {
case R_SI:
rm = 4;
break;
case R_DI:
rm = 5;
break;
case R_BP:
rm = 6;
break;
case R_BX:
rm = 7;
break;
}
if (rm == -1) /* can't happen, in theory */
goto err; /* so panic if it does */
if (o == 0 && seg == NO_SEG && !forw_ref && rm != 6 &&
!(input->eaflags & (EAF_BYTEOFFS | EAF_WORDOFFS)))
mod = 0;
else if (IS_MOD_01())
mod = 1;
else
mod = 2;
output->sib_present = false; /* no SIB - it's 16-bit */
output->bytes = mod; /* bytes of offset needed */
output->modrm = GEN_MODRM(mod, rfield, rm);
}
}
}
output->size = 1 + output->sib_present + output->bytes;
return output->type;
err:
return output->type = EA_INVALID;
}
static void add_asp(insn *ins, int addrbits)
{
int j, valid;
int defdisp;
valid = (addrbits == 64) ? 64|32 : 32|16;
switch (ins->prefixes[PPS_ASIZE]) {
case P_A16:
valid &= 16;
break;
case P_A32:
valid &= 32;
break;
case P_A64:
valid &= 64;
break;
case P_ASP:
valid &= (addrbits == 32) ? 16 : 32;
break;
default:
break;
}
for (j = 0; j < ins->operands; j++) {
if (is_class(MEMORY, ins->oprs[j].type)) {
opflags_t i, b;
/* Verify as Register */
if (!is_register(ins->oprs[j].indexreg))
i = 0;
else
i = nasm_reg_flags[ins->oprs[j].indexreg];
/* Verify as Register */
if (!is_register(ins->oprs[j].basereg))
b = 0;
else
b = nasm_reg_flags[ins->oprs[j].basereg];
if (ins->oprs[j].scale == 0)
i = 0;
if (!i && !b) {
int ds = ins->oprs[j].disp_size;
if ((addrbits != 64 && ds > 8) ||
(addrbits == 64 && ds == 16))
valid &= ds;
} else {
if (!(REG16 & ~b))
valid &= 16;
if (!(REG32 & ~b))
valid &= 32;
if (!(REG64 & ~b))
valid &= 64;
if (!(REG16 & ~i))
valid &= 16;
if (!(REG32 & ~i))
valid &= 32;
if (!(REG64 & ~i))
valid &= 64;
}
}
}
if (valid & addrbits) {
ins->addr_size = addrbits;
} else if (valid & ((addrbits == 32) ? 16 : 32)) {
/* Add an address size prefix */
ins->prefixes[PPS_ASIZE] = (addrbits == 32) ? P_A16 : P_A32;;
ins->addr_size = (addrbits == 32) ? 16 : 32;
} else {
/* Impossible... */
errfunc(ERR_NONFATAL, "impossible combination of address sizes");
ins->addr_size = addrbits; /* Error recovery */
}
defdisp = ins->addr_size == 16 ? 16 : 32;
for (j = 0; j < ins->operands; j++) {
if (!(MEM_OFFS & ~ins->oprs[j].type) &&
(ins->oprs[j].disp_size ? ins->oprs[j].disp_size : defdisp) != ins->addr_size) {
/*
* mem_offs sizes must match the address size; if not,
* strip the MEM_OFFS bit and match only EA instructions
*/
ins->oprs[j].type &= ~(MEM_OFFS & ~MEMORY);
}
}
}
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