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iasm.c
4584 lines (4179 loc) · 135 KB
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iasm.c
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/*
* Copyright (c) 1992-1999 by Symantec
* Copyright (c) 1999-2011 by Digital Mars
* All Rights Reserved
* http://www.digitalmars.com
* http://www.dsource.org/projects/dmd/browser/branches/dmd-1.x/src/iasm.c
* http://www.dsource.org/projects/dmd/browser/trunk/src/iasm.c
* Written by Mike Cote, John Micco and Walter Bright
* D version by Walter Bright
*
* This source file is made available for personal use
* only. The license is in /dmd/src/dmd/backendlicense.txt
* For any other uses, please contact Digital Mars.
*/
// Inline assembler for the D programming language compiler
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <assert.h>
#include <setjmp.h>
#if __DMC__
#undef setjmp
#include <limits.h>
#endif
// D compiler
#include "mars.h"
#include "lexer.h"
#include "mtype.h"
#include "statement.h"
#include "id.h"
#include "declaration.h"
#include "scope.h"
#include "init.h"
#include "enum.h"
#include "module.h"
// C/C++ compiler
#define SCOPE_H 1 // avoid conflicts with D's Scope
#include "cc.h"
#include "token.h"
#include "parser.h"
#include "global.h"
#include "el.h"
#include "type.h"
#include "oper.h"
#include "code.h"
#include "iasm.h"
#include "cpp.h"
// I32 isn't set correctly yet because this is the front end, and I32
// is a backend flag
#undef I16
#undef I32
#undef I64
#define I16 0
#define I32 (global.params.isX86_64 == 0)
#define I64 (global.params.isX86_64 == 1)
//#define EXTRA_DEBUG 1
#undef ADDFWAIT
#define ADDFWAIT() 0
// Error numbers
enum ASMERRMSGS
{
EM_bad_float_op,
EM_bad_addr_mode,
EM_align,
EM_opcode_exp,
EM_prefix,
EM_eol,
EM_bad_operand,
EM_bad_integral_operand,
EM_ident_exp,
EM_not_struct,
EM_nops_expected,
EM_bad_op,
EM_const_init,
EM_undefined,
EM_pointer,
EM_colon,
EM_rbra,
EM_rpar,
EM_ptr_exp,
EM_num,
EM_float,
EM_char,
EM_label_expected,
EM_uplevel,
EM_type_as_operand,
EM_invalid_64bit_opcode,
};
const char *asmerrmsgs[] =
{
"unknown operand for floating point instruction",
"bad addr mode",
"align %d must be a power of 2",
"opcode expected, not %s",
"prefix",
"end of instruction",
"bad operand",
"bad integral operand",
"identifier expected",
"not struct",
"%u operands found for %s instead of the expected %u",
"bad type/size of operands '%s'",
"constant initializer expected",
"undefined identifier '%s'",
"pointer",
"colon",
"] expected instead of '%s'",
") expected instead of '%s'",
"ptr expected",
"integer expected",
"floating point expected",
"character is truncated",
"label expected",
"uplevel nested reference to variable %s",
"cannot use type %s as an operand",
"opcode %s is unavailable in 64bit mode"
};
// Additional tokens for the inline assembler
typedef enum
{
ASMTKlocalsize = TOKMAX + 1,
ASMTKdword,
ASMTKeven,
ASMTKfar,
ASMTKnaked,
ASMTKnear,
ASMTKptr,
ASMTKqword,
ASMTKseg,
ASMTKword,
ASMTKmax = ASMTKword-(TOKMAX+1)+1
} ASMTK;
static const char *apszAsmtk[ASMTKmax] = {
"__LOCAL_SIZE",
"dword",
"even",
"far",
"naked",
"near",
"ptr",
"qword",
"seg",
"word",
};
struct ASM_STATE
{
unsigned char ucItype; // Instruction type
#define ITprefix 0x10 // special prefix
#define ITjump 0x20 // jump instructions CALL, Jxx and LOOPxx
#define ITimmed 0x30 // value of an immediate operand controls
// code generation
#define ITopt 0x40 // not all operands are required
#define ITshift 0x50 // rotate and shift instructions
#define ITfloat 0x60 // floating point coprocessor instructions
#define ITdata 0x70 // DB, DW, DD, DQ, DT pseudo-ops
#define ITaddr 0x80 // DA (define addresss) pseudo-op
#define ITMASK 0xF0
#define ITSIZE 0x0F // mask for size
Loc loc;
unsigned char bInit;
LabelDsymbol *psDollar;
Dsymbol *psLocalsize;
jmp_buf env;
unsigned char bReturnax;
AsmStatement *statement;
Scope *sc;
};
ASM_STATE asmstate;
static Token *asmtok;
static enum TOK tok_value;
//char debuga = 1;
// From ptrntab.c
const char *asm_opstr(OP *pop);
OP *asm_op_lookup(const char *s);
void init_optab();
static unsigned char asm_TKlbra_seen = FALSE;
typedef struct
{
char regstr[6];
unsigned char val;
opflag_t ty;
} REG;
static REG regFp = { "ST", 0, _st };
static REG aregFp[] = {
{ "ST(0)", 0, _sti },
{ "ST(1)", 1, _sti },
{ "ST(2)", 2, _sti },
{ "ST(3)", 3, _sti },
{ "ST(4)", 4, _sti },
{ "ST(5)", 5, _sti },
{ "ST(6)", 6, _sti },
{ "ST(7)", 7, _sti }
};
#define _AL 0
#define _AH 4
#define _AX 0
#define _EAX 0
#define _BL 3
#define _BH 7
#define _BX 3
#define _EBX 3
#define _CL 1
#define _CH 5
#define _CX 1
#define _ECX 1
#define _DL 2
#define _DH 6
#define _DX 2
#define _EDX 2
#define _BP 5
#define _EBP 5
#define _SP 4
#define _ESP 4
#define _DI 7
#define _EDI 7
#define _SI 6
#define _ESI 6
#define _ES 0
#define _CS 1
#define _SS 2
#define _DS 3
#define _GS 5
#define _FS 4
static REG regtab[] =
{
"AL", _AL, _r8 | _al,
"AH", _AH, _r8,
"AX", _AX, _r16 | _ax,
"EAX", _EAX, _r32 | _eax,
"BL", _BL, _r8,
"BH", _BH, _r8,
"BX", _BX, _r16,
"EBX", _EBX, _r32,
"CL", _CL, _r8 | _cl,
"CH", _CH, _r8,
"CX", _CX, _r16,
"ECX", _ECX, _r32,
"DL", _DL, _r8,
"DH", _DH, _r8,
"DX", _DX, _r16 | _dx,
"EDX", _EDX, _r32,
"BP", _BP, _r16,
"EBP", _EBP, _r32,
"SP", _SP, _r16,
"ESP", _ESP, _r32,
"DI", _DI, _r16,
"EDI", _EDI, _r32,
"SI", _SI, _r16,
"ESI", _ESI, _r32,
"ES", _ES, _seg | _es,
"CS", _CS, _seg | _cs,
"SS", _SS, _seg | _ss ,
"DS", _DS, _seg | _ds,
"GS", _GS, _seg | _gs,
"FS", _FS, _seg | _fs,
"CR0", 0, _special | _crn,
"CR2", 2, _special | _crn,
"CR3", 3, _special | _crn,
"CR4", 4, _special | _crn,
"DR0", 0, _special | _drn,
"DR1", 1, _special | _drn,
"DR2", 2, _special | _drn,
"DR3", 3, _special | _drn,
"DR4", 4, _special | _drn,
"DR5", 5, _special | _drn,
"DR6", 6, _special | _drn,
"DR7", 7, _special | _drn,
"TR3", 3, _special | _trn,
"TR4", 4, _special | _trn,
"TR5", 5, _special | _trn,
"TR6", 6, _special | _trn,
"TR7", 7, _special | _trn,
"MM0", 0, _mm,
"MM1", 1, _mm,
"MM2", 2, _mm,
"MM3", 3, _mm,
"MM4", 4, _mm,
"MM5", 5, _mm,
"MM6", 6, _mm,
"MM7", 7, _mm,
"XMM0", 0, _xmm,
"XMM1", 1, _xmm,
"XMM2", 2, _xmm,
"XMM3", 3, _xmm,
"XMM4", 4, _xmm,
"XMM5", 5, _xmm,
"XMM6", 6, _xmm,
"XMM7", 7, _xmm,
};
// 64 bit only registers
#define _RAX 0
#define _RBX 3
#define _RCX 1
#define _RDX 2
#define _RSI 6
#define _RDI 7
#define _RBP 5
#define _RSP 4
#define _R8 8
#define _R9 9
#define _R10 10
#define _R11 11
#define _R12 12
#define _R13 13
#define _R14 14
#define _R15 15
#define _R8D 8
#define _R9D 9
#define _R10D 10
#define _R11D 11
#define _R12D 12
#define _R13D 13
#define _R14D 14
#define _R15D 15
#define _R8W 8
#define _R9W 9
#define _R10W 10
#define _R11W 11
#define _R12W 12
#define _R13W 13
#define _R14W 13
#define _R15W 15
#define _SIL 6
#define _DIL 7
#define _BPL 5
#define _SPL 4
#define _R8B 8
#define _R9B 9
#define _R10B 10
#define _R11B 11
#define _R12B 12
#define _R13B 13
#define _R14B 14
#define _R15B 15
static REG regtab64[] =
{
"RAX", _RAX, _r64 | _rax,
"RBX", _RBX, _r64,
"RCX", _RCX, _r64,
"RDX", _RDX, _r64,
"RSI", _RSI, _r64,
"RDI", _RDI, _r64,
"RBP", _RBP, _r64,
"RSP", _RSP, _r64,
"R8", _R8, _r64,
"R9", _R9, _r64,
"R10", _R10, _r64,
"R11", _R11, _r64,
"R12", _R12, _r64,
"R13", _R13, _r64,
"R14", _R14, _r64,
"R15", _R15, _r64,
"R8D", _R8D, _r32,
"R9D", _R9D, _r32,
"R10D", _R10D, _r32,
"R11D", _R11D, _r32,
"R12D", _R12D, _r32,
"R13D", _R13D, _r32,
"R14D", _R14D, _r32,
"R15D", _R15D, _r32,
"R8W", _R8W, _r16,
"R9W", _R9W, _r16,
"R10W", _R10W, _r16,
"R11W", _R11W, _r16,
"R12W", _R12W, _r16,
"R13W", _R13W, _r16,
"R14W", _R14W, _r16,
"R15W", _R15W, _r16,
"SIL", _SIL, _r8,
"DIL", _DIL, _r8,
"BPL", _BPL, _r8,
"SPL", _SPL, _r8,
"R8B", _R8B, _r8,
"R9B", _R9B, _r8,
"R10B", _R10B, _r8,
"R11B", _R11B, _r8,
"R12B", _R12B, _r8,
"R13B", _R13B, _r8,
"R14B", _R14B, _r8,
"R15B", _R15B, _r8,
"XMM8", 8, _xmm,
"XMM9", 9, _xmm,
"XMM10", 10, _xmm,
"XMM11", 11, _xmm,
"XMM12", 12, _xmm,
"XMM13", 13, _xmm,
"XMM14", 14, _xmm,
"XMM15", 15, _xmm,
};
typedef enum {
ASM_JUMPTYPE_UNSPECIFIED,
ASM_JUMPTYPE_SHORT,
ASM_JUMPTYPE_NEAR,
ASM_JUMPTYPE_FAR
} ASM_JUMPTYPE; // ajt
typedef struct opnd
{
REG *base; // if plain register
REG *pregDisp1; // if [register1]
REG *pregDisp2;
REG *segreg; // if segment override
char indirect; // if had a '*' or '->'
char bOffset; // if 'offset' keyword
char bSeg; // if 'segment' keyword
char bPtr; // if 'ptr' keyword
unsigned uchMultiplier; // register multiplier; valid values are 0,1,2,4,8
opflag_t usFlags;
Dsymbol *s;
targ_llong disp;
long double real;
Type *ptype;
ASM_JUMPTYPE ajt;
} OPND;
//
// Exported functions called from the compiler
//
int asm_state(int iFlags);
void iasm_term();
//
// Local functions defined and only used here
//
STATIC OPND *asm_add_exp();
STATIC OPND *opnd_calloc();
STATIC void opnd_free(OPND *popnd);
STATIC OPND *asm_and_exp();
STATIC OPND *asm_cond_exp();
STATIC opflag_t asm_determine_operand_flags(OPND *popnd);
code *asm_genloc(Loc loc, code *c);
int asm_getnum();
STATIC void asmerr(const char *, ...);
STATIC void asmerr(int, ...);
#pragma SC noreturn(asmerr)
STATIC OPND *asm_equal_exp();
STATIC OPND *asm_inc_or_exp();
STATIC OPND *asm_log_and_exp();
STATIC OPND *asm_log_or_exp();
STATIC char asm_length_type_size(OPND *popnd);
STATIC void asm_token();
STATIC void asm_token_trans(Token *tok);
STATIC unsigned char asm_match_flags(opflag_t usOp , opflag_t usTable );
STATIC unsigned char asm_match_float_flags(opflag_t usOp, opflag_t usTable);
STATIC void asm_make_modrm_byte(
#ifdef DEBUG
unsigned char *puchOpcode, unsigned *pusIdx,
#endif
code *pc,
unsigned usFlags,
OPND *popnd, OPND *popnd2);
STATIC regm_t asm_modify_regs(PTRNTAB ptb, OPND *popnd1, OPND *popnd2);
STATIC void asm_output_flags(opflag_t usFlags);
STATIC void asm_output_popnd(OPND *popnd);
STATIC unsigned asm_type_size(Type * ptype);
STATIC opflag_t asm_float_type_size(Type * ptype, opflag_t *pusFloat);
STATIC OPND *asm_mul_exp();
STATIC OPND *asm_br_exp();
STATIC OPND *asm_primary_exp();
STATIC OPND *asm_prim_post(OPND *);
STATIC OPND *asm_rel_exp();
STATIC OPND *asm_shift_exp();
STATIC OPND *asm_una_exp();
STATIC OPND *asm_xor_exp();
STATIC void *link_alloc(size_t, void *);
STATIC void asm_chktok(enum TOK toknum, unsigned errnum);
STATIC code *asm_db_parse(OP *pop);
STATIC code *asm_da_parse(OP *pop);
unsigned compute_hashkey(char *);
/*******************************
*/
STATIC OPND *opnd_calloc()
{ OPND *o;
o = new OPND();
memset(o, 0, sizeof(*o));
return o;
}
/*******************************
*/
STATIC void opnd_free(OPND *o)
{
if (o)
{
delete o;
}
}
/*******************************
*/
STATIC void asm_chktok(enum TOK toknum,unsigned errnum)
{
if (tok_value == toknum)
asm_token(); // scan past token
else
/* When we run out of tokens, asmtok is NULL.
* But when this happens when a ';' was hit.
*/
asmerr(errnum, asmtok ? asmtok->toChars() : ";");
}
/*******************************
*/
STATIC PTRNTAB asm_classify(OP *pop, OPND *popnd1, OPND *popnd2, OPND *popnd3,
unsigned *pusNumops)
{
unsigned usNumops;
unsigned usActual;
PTRNTAB ptbRet = { NULL };
opflag_t opflags1 = 0 ;
opflag_t opflags2 = 0;
opflag_t opflags3 = 0;
char bFake = FALSE;
char bInvalid64bit = FALSE;
unsigned char bMatch1, bMatch2, bMatch3, bRetry = FALSE;
// How many arguments are there? the parser is strictly left to right
// so this should work.
if (!popnd1)
usNumops = 0;
else
{
popnd1->usFlags = opflags1 = asm_determine_operand_flags(popnd1);
if (!popnd2)
usNumops = 1;
else
{
popnd2->usFlags = opflags2 = asm_determine_operand_flags(popnd2);
if (!popnd3)
usNumops = 2;
else
{
popnd3->usFlags = opflags3 = asm_determine_operand_flags(popnd3);
usNumops = 3;
}
}
}
// Now check to insure that the number of operands is correct
usActual = (pop->usNumops & ITSIZE);
if (usActual != usNumops && asmstate.ucItype != ITopt &&
asmstate.ucItype != ITfloat)
{
PARAM_ERROR:
asmerr(EM_nops_expected, usNumops, asm_opstr(pop), usActual);
}
if (usActual < usNumops)
*pusNumops = usActual;
else
*pusNumops = usNumops;
//
// The number of arguments matches, now check to find the opcode
// in the associated opcode table
//
RETRY:
//printf("usActual = %d\n", usActual);
switch (usActual)
{
case 0:
if (I64 && (pop->ptb.pptb0->usFlags & _i64_bit))
asmerr( EM_invalid_64bit_opcode, asm_opstr(pop)); // illegal opcode in 64bit mode
ptbRet = pop->ptb;
goto RETURN_IT;
case 1:
{ //printf("opflags1 = "); asm_output_flags(opflags1); printf("\n");
PTRNTAB1 *table1;
for (table1 = pop->ptb.pptb1; table1->usOpcode != ASM_END;
table1++)
{
//printf("table = "); asm_output_flags(table1->usOp1); printf("\n");
bMatch1 = asm_match_flags(opflags1, table1->usOp1);
//printf("bMatch1 = x%x\n", bMatch1);
if (bMatch1)
{ if (table1->usOpcode == 0x68 &&
!I16 &&
table1->usOp1 == _imm16
)
// Don't match PUSH imm16 in 32 bit code
continue;
// Check if match is invalid in 64bit mode
if (I64 && (table1->usFlags & _i64_bit))
{
bInvalid64bit = TRUE;
continue;
}
break;
}
if ((asmstate.ucItype == ITimmed) &&
asm_match_flags(opflags1,
CONSTRUCT_FLAGS(_8 | _16 | _32, _imm, _normal,
0)) &&
popnd1->disp == table1->usFlags)
break;
if ((asmstate.ucItype == ITopt ||
asmstate.ucItype == ITfloat) &&
!usNumops &&
!table1->usOp1)
{
if (usNumops > 1)
goto PARAM_ERROR;
break;
}
}
if (table1->usOpcode == ASM_END)
{
#ifdef DEBUG
if (debuga)
{ printf("\t%s\t", asm_opstr(pop));
if (popnd1)
asm_output_popnd(popnd1);
if (popnd2) {
printf(",");
asm_output_popnd(popnd2);
}
if (popnd3) {
printf(",");
asm_output_popnd(popnd3);
}
printf("\n");
printf("OPCODE mism = ");
if (popnd1)
asm_output_flags(popnd1->usFlags);
else
printf("NONE");
printf("\n");
}
#endif
TYPE_SIZE_ERROR:
if (popnd1 && ASM_GET_aopty(popnd1->usFlags) != _reg)
{
opflags1 = popnd1->usFlags |= _anysize;
if (asmstate.ucItype == ITjump)
{
if (bRetry && popnd1->s && !popnd1->s->isLabel())
{
asmerr(EM_label_expected, popnd1->s->toChars());
}
popnd1->usFlags |= CONSTRUCT_FLAGS(0, 0, 0,
_fanysize);
}
}
if (popnd2 && ASM_GET_aopty(popnd2->usFlags) != _reg) {
opflags2 = popnd2->usFlags |= (_anysize);
if (asmstate.ucItype == ITjump)
popnd2->usFlags |= CONSTRUCT_FLAGS(0, 0, 0,
_fanysize);
}
if (popnd3 && ASM_GET_aopty(popnd3->usFlags) != _reg) {
opflags3 = popnd3->usFlags |= (_anysize);
if (asmstate.ucItype == ITjump)
popnd3->usFlags |= CONSTRUCT_FLAGS(0, 0, 0,
_fanysize);
}
if (bRetry)
{
if(bInvalid64bit)
asmerr("operand for '%s' invalid in 64bit mode", asm_opstr(pop));
else
asmerr(EM_bad_op, asm_opstr(pop)); // illegal type/size of operands
}
bRetry = TRUE;
goto RETRY;
}
ptbRet.pptb1 = table1;
goto RETURN_IT;
}
case 2:
{ //printf("opflags1 = "); asm_output_flags(opflags1); printf(" ");
//printf("opflags2 = "); asm_output_flags(opflags2); printf("\n");
PTRNTAB2 *table2;
for (table2 = pop->ptb.pptb2;
table2->usOpcode != ASM_END;
table2++)
{
//printf("table1 = "); asm_output_flags(table2->usOp1); printf(" ");
//printf("table2 = "); asm_output_flags(table2->usOp2); printf("\n");
if (I64 && (table2->usFlags & _i64_bit))
asmerr( EM_invalid_64bit_opcode, asm_opstr(pop));
bMatch1 = asm_match_flags(opflags1, table2->usOp1);
bMatch2 = asm_match_flags(opflags2, table2->usOp2);
//printf("match1 = %d, match2 = %d\n",bMatch1,bMatch2);
if (bMatch1 && bMatch2) {
//printf("match\n");
/* If they both match and the first op in the table is not AL
* or size of 8 and the second is immediate 8,
* then check to see if the constant
* is a signed 8 bit constant. If so, then do not match, otherwise match
*/
if (!bRetry &&
!((ASM_GET_uSizemask(table2->usOp1) & _8) ||
(ASM_GET_uRegmask(table2->usOp1) & _al)) &&
(ASM_GET_aopty(table2->usOp2) == _imm) &&
(ASM_GET_uSizemask(table2->usOp2) & _8))
{
if (popnd2->disp <= SCHAR_MAX)
break;
else
bFake = TRUE;
}
else
break;
}
if (asmstate.ucItype == ITopt ||
asmstate.ucItype == ITfloat)
{
switch (usNumops)
{
case 0:
if (!table2->usOp1)
goto Lfound2;
break;
case 1:
if (bMatch1 && !table2->usOp2)
goto Lfound2;
break;
case 2:
break;
default:
goto PARAM_ERROR;
}
}
#if 0
if (asmstate.ucItype == ITshift &&
!table2->usOp2 &&
bMatch1 && popnd2->disp == 1 &&
asm_match_flags(opflags2,
CONSTRUCT_FLAGS(_8|_16|_32, _imm,_normal,0))
)
break;
#endif
}
Lfound2:
if (table2->usOpcode == ASM_END)
{
#ifdef DEBUG
if (debuga)
{ printf("\t%s\t", asm_opstr(pop));
if (popnd1)
asm_output_popnd(popnd1);
if (popnd2) {
printf(",");
asm_output_popnd(popnd2);
}
if (popnd3) {
printf(",");
asm_output_popnd(popnd3);
}
printf("\n");
printf("OPCODE mismatch = ");
if (popnd1)
asm_output_flags(popnd1->usFlags);
else
printf("NONE");
printf( " Op2 = ");
if (popnd2)
asm_output_flags(popnd2->usFlags);
else
printf("NONE");
printf("\n");
}
#endif
goto TYPE_SIZE_ERROR;
}
ptbRet.pptb2 = table2;
goto RETURN_IT;
}
case 3:
{
PTRNTAB3 *table3;
for (table3 = pop->ptb.pptb3;
table3->usOpcode != ASM_END;
table3++)
{
bMatch1 = asm_match_flags(opflags1, table3->usOp1);
bMatch2 = asm_match_flags(opflags2, table3->usOp2);
bMatch3 = asm_match_flags(opflags3, table3->usOp3);
if (bMatch1 && bMatch2 && bMatch3)
goto Lfound3;
if (asmstate.ucItype == ITopt)
{
switch (usNumops)
{
case 0:
if (!table3->usOp1)
goto Lfound3;
break;
case 1:
if (bMatch1 && !table3->usOp2)
goto Lfound3;
break;
case 2:
if (bMatch1 && bMatch2 && !table3->usOp3)
goto Lfound3;
break;
case 3:
break;
default:
goto PARAM_ERROR;
}
}
}
Lfound3:
if (table3->usOpcode == ASM_END)
{
#ifdef DEBUG
if (debuga)
{ printf("\t%s\t", asm_opstr(pop));
if (popnd1)
asm_output_popnd(popnd1);
if (popnd2) {
printf(",");
asm_output_popnd(popnd2);
}
if (popnd3) {
printf(",");
asm_output_popnd(popnd3);
}
printf("\n");
printf("OPCODE mismatch = ");
if (popnd1)
asm_output_flags(popnd1->usFlags);
else
printf("NONE");
printf( " Op2 = ");
if (popnd2)
asm_output_flags(popnd2->usFlags);
else
printf("NONE");
if (popnd3)
asm_output_flags(popnd3->usFlags);
printf("\n");
}
#endif
goto TYPE_SIZE_ERROR;
}
ptbRet.pptb3 = table3;
goto RETURN_IT;
}
}
RETURN_IT:
if (bRetry && !bFake)
{
asmerr(EM_bad_op, asm_opstr(pop));
}
return ptbRet;
}
/*******************************
*/
STATIC opflag_t asm_determine_float_flags(OPND *popnd)
{
//printf("asm_determine_float_flags()\n");
opflag_t us, usFloat;
// Insure that if it is a register, that it is not a normal processor
// register.
if (popnd->base &&
!popnd->s && !popnd->disp && !popnd->real
&& !(popnd->base->ty & (_r8 | _r16 | _r32)))
{
return popnd->base->ty;
}
if (popnd->pregDisp1 && !popnd->base)
{
us = asm_float_type_size(popnd->ptype, &usFloat);
//printf("us = x%x, usFloat = x%x\n", us, usFloat);
if (popnd->pregDisp1->ty & (_r32 | _r64))
return(CONSTRUCT_FLAGS(us, _m, _addr32, usFloat));
else
if (popnd->pregDisp1->ty & _r16)
return(CONSTRUCT_FLAGS(us, _m, _addr16, usFloat));
}
else if (popnd->s != 0)
{
us = asm_float_type_size(popnd->ptype, &usFloat);
return CONSTRUCT_FLAGS(us, _m, _normal, usFloat);
}
if (popnd->segreg)
{
us = asm_float_type_size(popnd->ptype, &usFloat);
if (I16)
return(CONSTRUCT_FLAGS(us, _m, _addr16, usFloat));
else
return(CONSTRUCT_FLAGS(us, _m, _addr32, usFloat));
}
#if 0
if (popnd->real)
{
switch (popnd->ptype->ty)
{
case Tfloat32:
popnd->s = fconst(popnd->real);
return(CONSTRUCT_FLAGS(_32, _m, _normal, 0));
case Tfloat64:
popnd->s = dconst(popnd->real);
return(CONSTRUCT_FLAGS(0, _m, _normal, _f64));
case Tfloat80:
popnd->s = ldconst(popnd->real);
return(CONSTRUCT_FLAGS(0, _m, _normal, _f80));
}
}
#endif
asmerr(EM_bad_float_op); // unknown operand for floating point instruction
return 0;
}
/*******************************
*/
STATIC opflag_t asm_determine_operand_flags(OPND *popnd)
{
Dsymbol *ps;
int ty;
opflag_t us;
opflag_t sz;
ASM_OPERAND_TYPE opty;
ASM_MODIFIERS amod;
// If specified 'offset' or 'segment' but no symbol
if ((popnd->bOffset || popnd->bSeg) && !popnd->s)
asmerr(EM_bad_addr_mode); // illegal addressing mode
if (asmstate.ucItype == ITfloat)
return asm_determine_float_flags(popnd);
// If just a register
if (popnd->base && !popnd->s && !popnd->disp && !popnd->real)
return popnd->base->ty;
#if DEBUG
if (debuga)