/* =============================================================================
* ud_decode() - Instruction decoder. Returns the number of bytes decoded.
* =============================================================================
*/
unsigned int
ud_decode(struct ud *u)
{
inp_start(u);
clear_insn(u);
u->le = &ud_lookup_table_list[0];
u->error = decode_prefixes(u) == -1 ||
decode_opcode(u) == -1 ||
u->error;
/* Handle decode error. */
if (u->error) {
/* clear out the decode data. */
clear_insn(u);
/* mark the sequence of bytes as invalid. */
u->itab_entry = & s_ie__invalid;
u->mnemonic = u->itab_entry->mnemonic;
}
/* maybe this stray segment override byte
* should be spewed out?
*/
if ( !P_SEG( u->itab_entry->prefix ) &&
u->operand[0].type != UD_OP_MEM &&
u->operand[1].type != UD_OP_MEM )
u->pfx_seg = 0;
u->insn_offset = u->pc; /* set offset of instruction */
u->insn_fill = 0; /* set translation buffer index to 0 */
u->pc += u->inp_ctr; /* move program counter by bytes decoded */
gen_hex( u ); /* generate hex code */
/* return number of bytes disassembled. */
return u->inp_ctr;
}
/* =============================================================================
* ud_decode() - Instruction decoder. Returns the number of bytes decoded.
* =============================================================================
*/
unsigned int ud_decode( struct ud* u )
{
inp_start(u);
if ( clear_insn( u ) ) {
; /* error */
} else if ( get_prefixes( u ) != 0 ) {
; /* error */
} else if ( search_itab( u ) != 0 ) {
; /* error */
} else if ( do_mode( u ) != 0 ) {
; /* error */
} else if ( disasm_operands( u ) != 0 ) {
; /* error */
} else if ( resolve_mnemonic( u ) != 0 ) {
; /* error */
}
/* Handle decode error. */
if ( u->error ) {
/* clear out the decode data. */
clear_insn( u );
/* mark the sequence of bytes as invalid. */
u->itab_entry = & ie_invalid;
u->mnemonic = u->itab_entry->mnemonic;
}
u->insn_offset = u->pc; /* set offset of instruction */
u->insn_fill = 0; /* set translation buffer index to 0 */
u->pc += u->inp_ctr; /* move program counter by bytes decoded */
gen_hex( u ); /* generate hex code */
/* return number of bytes disassembled. */
return u->inp_ctr;
}
