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segment override prefix support (Filip Navara)

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bellard 2005-09-03 22:03:39 +00:00
parent 6f8b8887b1
commit 3ba1190eb4
1 changed files with 26 additions and 2 deletions
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28
i386-asm.c
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@ -151,6 +151,15 @@ static const uint8_t test_bits[NB_TEST_OPCODES] = {
0x0f, /* g */
};
static const uint8_t segment_prefixes[] = {
0x26, /* es */
0x2e, /* cs */
0x36, /* ss */
0x3e, /* ds */
0x64, /* fs */
0x65 /* gs */
};
static const ASMInstr asm_instrs[] = {
#define ALT(x) x
#define DEF_ASM_OP0(name, opcode)
@ -410,14 +419,15 @@ static inline void asm_modrm(int reg, Operand *op)
static void asm_opcode(TCCState *s1, int opcode)
{
const ASMInstr *pa;
int i, modrm_index, reg, v, op1, is_short_jmp;
int i, modrm_index, reg, v, op1, is_short_jmp, has_seg_prefix;
int nb_ops, s, ss;
Operand ops[MAX_OPERANDS], *pop;
Operand ops[MAX_OPERANDS], *pop, seg_prefix;
int op_type[3]; /* decoded op type */
/* get operands */
pop = ops;
nb_ops = 0;
has_seg_prefix = 0;
for(;;) {
if (tok == ';' || tok == TOK_LINEFEED)
break;
@ -425,6 +435,18 @@ static void asm_opcode(TCCState *s1, int opcode)
error("incorrect number of operands");
}
parse_operand(s1, pop);
if (tok == ':') {
if (pop->type != OP_SEG || has_seg_prefix) {
error("incorrect prefix");
}
seg_prefix = *pop;
has_seg_prefix = 1;
next();
parse_operand(s1, pop);
if (!(pop->type & OP_EA)) {
error("segment prefix must be followed by memory reference");
}
}
pop++;
nb_ops++;
if (tok != ',')
@ -538,6 +560,8 @@ static void asm_opcode(TCCState *s1, int opcode)
/* now generates the operation */
if (pa->instr_type & OPC_FWAIT)
g(0x9b);
if (has_seg_prefix)
g(segment_prefixes[seg_prefix.reg]);
v = pa->opcode;
if (v == 0x69 || v == 0x69) {