static int
resolve_mode( struct ud* u )
{
/* if in error state, bail out */
if ( u->error ) return -1;
/* propagate prefix effects */
if ( u->dis_mode == 64 ) { /* set 64bit-mode flags */
/* Check validity of instruction m64 */
if ( P_INV64( u->itab_entry->prefix ) ) {
u->error = 1;
return -1;
}
/* effective rex prefix is the effective mask for the
* instruction hard-coded in the opcode map.
*/
u->pfx_rex = ( u->pfx_rex & 0x40 ) |
( u->pfx_rex & REX_PFX_MASK( u->itab_entry->prefix ) );
/* whether this instruction has a default operand size of
* 64bit, also hardcoded into the opcode map.
*/
u->default64 = P_DEF64( u->itab_entry->prefix );
/* calculate effective operand size */
if ( REX_W( u->pfx_rex ) ) {
u->opr_mode = 64;
} else if ( u->pfx_opr ) {
u->opr_mode = 16;
} else {
/* unless the default opr size of instruction is 64,
* the effective operand size in the absence of rex.w
* prefix is 32.
*/
u->opr_mode = ( u->default64 ) ? 64 : 32;
}
/* calculate effective address size */
u->adr_mode = (u->pfx_adr) ? 32 : 64;
} else if ( u->dis_mode == 32 ) { /* set 32bit-mode flags */
u->opr_mode = ( u->pfx_opr ) ? 16 : 32;
u->adr_mode = ( u->pfx_adr ) ? 16 : 32;
} else if ( u->dis_mode == 16 ) { /* set 16bit-mode flags */
u->opr_mode = ( u->pfx_opr ) ? 32 : 16;
u->adr_mode = ( u->pfx_adr ) ? 32 : 16;
}
/* These flags determine which operand to apply the operand size
* cast to.
*/
u->c1 = ( P_C1( u->itab_entry->prefix ) ) ? 1 : 0;
u->c2 = ( P_C2( u->itab_entry->prefix ) ) ? 1 : 0;
u->c3 = ( P_C3( u->itab_entry->prefix ) ) ? 1 : 0;
/* set flags for implicit addressing */
u->implicit_addr = P_IMPADDR( u->itab_entry->prefix );
return 0;
}
static int
resolve_mode( struct ud* u )
{
int default64;
/* if in error state, bail out */
if ( u->error ) return -1;
/* propagate prefix effects */
if ( u->dis_mode == 64 ) { /* set 64bit-mode flags */
/* Check validity of instruction m64 */
if ( P_INV64( u->itab_entry->prefix ) ) {
UDERR(u, "instruction invalid in 64bits\n");
return -1;
}
/* effective rex prefix is the effective mask for the
* instruction hard-coded in the opcode map.
*/
u->pfx_rex = ( u->pfx_rex & 0x40 ) |
( u->pfx_rex & REX_PFX_MASK( u->itab_entry->prefix ) );
/* whether this instruction has a default operand size of
* 64bit, also hardcoded into the opcode map.
*/
default64 = P_DEF64( u->itab_entry->prefix );
/* calculate effective operand size */
if ( REX_W( u->pfx_rex ) ) {
u->opr_mode = 64;
} else if ( u->pfx_opr ) {
u->opr_mode = 16;
} else {
/* unless the default opr size of instruction is 64,
* the effective operand size in the absence of rex.w
* prefix is 32.
*/
u->opr_mode = default64 ? 64 : 32;
}
/* calculate effective address size */
u->adr_mode = (u->pfx_adr) ? 32 : 64;
} else if ( u->dis_mode == 32 ) { /* set 32bit-mode flags */
u->opr_mode = ( u->pfx_opr ) ? 16 : 32;
u->adr_mode = ( u->pfx_adr ) ? 16 : 32;
} else if ( u->dis_mode == 16 ) { /* set 16bit-mode flags */
u->opr_mode = ( u->pfx_opr ) ? 32 : 16;
u->adr_mode = ( u->pfx_adr ) ? 32 : 16;
}
return 0;
}