/*
* Disassemble floating-point ("escape") instruction
* and return updated location.
*/
db_addr_t
db_disasm_esc(db_addr_t loc, int inst, int short_addr, int size, int rex,
char *seg)
{
int regmodrm;
struct finst *fp;
int mod;
struct i_addr address;
char * name;
get_value_inc(regmodrm, loc, 1, FALSE);
fp = &db_Esc_inst[inst - 0xd8][f_reg(regmodrm, 0)];
mod = f_mod(regmodrm);
if (mod != 3) {
if (*fp->f_name == '\0') {
db_printf("<bad instruction>");
return (loc);
}
/*
* Normal address modes.
*/
loc = db_read_address(loc, short_addr, regmodrm, rex, &address);
db_printf("%s", fp->f_name);
switch (fp->f_size) {
case SNGL:
db_printf("s");
break;
case DBLR:
db_printf("l");
break;
case EXTR:
db_printf("t");
break;
case WORD:
db_printf("s");
break;
case LONG:
db_printf("l");
break;
case QUAD:
db_printf("q");
break;
default:
break;
}
db_printf("\t");
db_print_address(seg, BYTE, &address);
} else {
/*
* 'reg-reg' - special formats
*/
switch (fp->f_rrmode) {
case op2(ST,STI):
name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
db_printf("%s\t%%st,%%st(%d)",name, f_rm(regmodrm, 0));
break;
case op2(STI,ST):
name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
db_printf("%s\t%%st(%d),%%st",name, f_rm(regmodrm, 0));
break;
case op1(STI):
name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
db_printf("%s\t%%st(%d)",name, f_rm(regmodrm, 0));
break;
case op1(X):
name = ((char * const *)fp->f_rrname)[f_rm(regmodrm,0)];
if (*name == '\0')
goto bad;
db_printf("%s", name);
break;
case op1(XA):
name = ((char * const *)fp->f_rrname)[f_rm(regmodrm,0)];
if (*name == '\0')
goto bad;
db_printf("%s\t%%ax", name);
break;
default:
bad:
db_printf("<bad instruction>");
break;
}
}
return (loc);
}
void launch_by_pointer(const Function *f)
{
// copy to registers
Function f_reg = *f;
f_reg();
}
