dev/i386/dis_tables.c

47  * Disassembly begins in dis_distable, which is equivalent to the One-byte
113 	Mb,		/* register or memory, always byte sized */
138 	NORM,		/* instructions w/o ModR/M byte, no memory access */
139 	IMPLMEM,	/* instructions w/o ModR/M byte, implicit mem access */
147 	Ib,		/* for push immediate byte */
222 #define	FILL	0x90	/* Fill byte used for alignment (nop)	*/
373  * decode for scale from SIB byte
1006 /* Need to handle multi-byte NOP */
1449  * Even in 64 bit mode, usually only 4 byte immediate operands are supported.
1465 #define	BYTE_OPND	0	/* w-bit value indicating byte register */
1476  * Get the next byte and separate the op code into the high and low nibbles.
1481 	int byte;
1492 	byte = x->d86_get_byte(x->d86_data);
1493 	if (byte < 0)
1495 	x->d86_bytes[x->d86_len++] = byte;
1496 	*low = byte & 0xf;		/* ----xxxx low 4 bits */
1497 	*high = byte >> 4 & 0xf;	/* xxxx---- bits 7 to 4 */
1502  * Get and decode an SIB (scaled index base) byte
1507 	int byte;
1512 	byte = x->d86_get_byte(x->d86_data);
1513 	if (byte < 0) {
1517 	x->d86_bytes[x->d86_len++] = byte;
1519 	*base = byte & 0x7;
1520 	*index = (byte >> 3) & 0x7;
1521 	*ss = (byte >> 6) & 0x3;
1525  * Get the byte following the op code and separate it into the
1565 	int byte;
1602 		byte = x->d86_get_byte(x->d86_data);
1603 		if (byte < 0) {
1607 		x->d86_bytes[x->d86_len++] = byte;
1608 		x->d86_opnd[opindex].d86_value |= (uint64_t)byte << (i * 8);
1659  * mode = addressing mode from ModRM byte
1660  * r_m = r_m (or reg if mode == 3) field from ModRM byte
1670 	int have_SIB = 0;	/* flag presence of scale-index-byte */
1764 	 * can involve an SIB (scaled index and base) byte to decode.
1864  * wbit indicates a byte(0) or opnd_size(1) operation
1950 	uint_t mode = 0;	/* mode value from ModRM byte */
1951 	uint_t reg;		/* reg value from ModRM byte */
1952 	uint_t r_m;		/* r_m value from ModRM byte */
1954 	uint_t opcode1;		/* high nibble of 1st byte */
1955 	uint_t opcode2;		/* low nibble of 1st byte */
1956 	uint_t opcode3;		/* extra opcode bits usually from ModRM byte */
1957 	uint_t opcode4;		/* high nibble of 2nd byte */
1958 	uint_t opcode5;		/* low nibble of 2nd byte */
1959 	uint_t opcode6;		/* high nibble of 3rd byte */
1960 	uint_t opcode7;		/* low nibble of 3rd byte */
2006 	 * Get one opcode byte and check for zero padding that follows
2015 		(void) strncpy(x->d86_mnem, ".byte\t0", OPLEN);
2112 	 * byte so we may need to perform a table indirection.
2205 	 * If still not at a TERM decode entry, then a ModRM byte
2321 		 * an extra byte, and thus an extra table.  As of this
2449 		 * wbit lives in 2nd byte, note that operands
2481 	 * opcode 0x6B for byte, sign-extended displacement, 0x69 for word(s)
2694 	/* single memory or register byte operand */
2792 	 * bits 3-4 of op code byte
3241 	 * byte (format Ib).  The int 3 instruction (opcode 0xCC),
3262 	/* an unused byte must be discarded */
3335 		 * Only the following exact byte sequences are allowed: