Initial revision

1 files changed, 820 insertions, 0 deletions

diff --git a/binutils/i960-pinsn.c b/binutils/i960-pinsn.c
new file mode 100644
index 0000000..1c7b719
--- /dev/null
+++ b/binutils/i960-pinsn.c
@@ -0,0 +1,820 @@
+/* Disassemble i80960 instructions.
+ */
+
+/* Copyright (C) 1990, 1991 Free Software Foundation, Inc.
+
+This file is part of BFD, the Binary File Diddler.
+
+BFD is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+BFD is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with BFD; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* $Id$ 
+   $Log
+*/
+#include <stdio.h>
+#include "sysdep.h"
+#include "bfd.h"
+
+extern char *xmalloc();
+extern int fputs();
+
+static char *reg_names[] = {
+/*  0 */	"pfp", "sp",  "rip", "r3",  "r4",  "r5",  "r6",  "r7", 
+/*  8 */	"r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15",
+/* 16 */	"g0",  "g1",  "g2",  "g3",  "g4",  "g5",  "g6",  "g7", 
+/* 24 */	"g8",  "g9",  "g10", "g11", "g12", "g13", "g14", "fp", 
+/* 32 */	"pc",  "ac",  "ip",  "tc",  "fp0", "fp1", "fp2", "fp3" 
+};
+
+
+static FILE *stream;		/* Output goes here */
+static void print_addr();
+static void ctrl();
+static void cobr();
+static void reg();
+static int mem();
+static void ea();
+static void dstop();
+static void regop();
+static void invalid();
+static int pinsn();
+static void put_abs();
+
+
+/* Print the i960 instruction at address 'memaddr' in debugged memory,
+ * on stream 's'.  Returns length of the instruction, in bytes.
+ */
+int
+print_insn_i960( memaddr, buffer, s )
+    bfd_vma memaddr;
+uint8e_type *buffer;
+    FILE *s;
+{
+    unsigned int word1, word2;
+
+    stream = s;
+    word1 =buffer [0] |( buffer[1]<< 8) | (buffer[2] << 16) | ( buffer[3] <<24);
+    word2 =buffer [4] |( buffer[5]<< 8) | (buffer[6] << 16) | ( buffer[7] <<24);
+    return pinsn( memaddr, word1, word2 );
+}
+
+#define IN_GDB
+
+/*****************************************************************************
+ *	All code below this point should be identical with that of
+ *	the disassembler in gdmp960.
+ *****************************************************************************/
+
+struct tabent {
+	char	*name;
+	char	numops;
+};
+
+static int
+pinsn( memaddr, word1, word2 )
+    unsigned long memaddr;
+    unsigned long word1, word2;
+{
+	int instr_len;
+
+	instr_len = 4;
+	put_abs( word1, word2 );
+
+	/* Divide instruction set into classes based on high 4 bits of opcode*/
+	switch ( (word1 >> 28) & 0xf ){
+	case 0x0:
+	case 0x1:
+		ctrl( memaddr, word1, word2 );
+		break;
+	case 0x2:
+	case 0x3:
+		cobr( memaddr, word1, word2 );
+		break;
+	case 0x5:
+	case 0x6:
+	case 0x7:
+		reg( word1 );
+		break;
+	case 0x8:
+	case 0x9:
+	case 0xa:
+	case 0xb:
+	case 0xc:
+		instr_len = mem( memaddr, word1, word2, 0 );
+		break;
+	default:
+		/* invalid instruction, print as data word */ 
+		invalid( word1 );
+		break;
+	}
+	return instr_len;
+}
+
+/****************************************/
+/* CTRL format				*/
+/****************************************/
+static void
+ctrl( memaddr, word1, word2 )
+    unsigned long memaddr;
+    unsigned long word1, word2;
+{
+	int i;
+	static struct tabent ctrl_tab[] = {
+		NULL,		0,	/* 0x00 */
+		NULL,		0,	/* 0x01 */
+		NULL,		0,	/* 0x02 */
+		NULL,		0,	/* 0x03 */
+		NULL,		0,	/* 0x04 */
+		NULL,		0,	/* 0x05 */
+		NULL,		0,	/* 0x06 */
+		NULL,		0,	/* 0x07 */
+		"b",		1,	/* 0x08 */
+		"call",		1,	/* 0x09 */
+		"ret",		0,	/* 0x0a */
+		"bal",		1,	/* 0x0b */
+		NULL,		0,	/* 0x0c */
+		NULL,		0,	/* 0x0d */
+		NULL,		0,	/* 0x0e */
+		NULL,		0,	/* 0x0f */
+		"bno",		1,	/* 0x10 */
+		"bg",		1,	/* 0x11 */
+		"be",		1,	/* 0x12 */
+		"bge",		1,	/* 0x13 */
+		"bl",		1,	/* 0x14 */
+		"bne",		1,	/* 0x15 */
+		"ble",		1,	/* 0x16 */
+		"bo",		1,	/* 0x17 */
+		"faultno",	0,	/* 0x18 */
+		"faultg",	0,	/* 0x19 */
+		"faulte",	0,	/* 0x1a */
+		"faultge",	0,	/* 0x1b */
+		"faultl",	0,	/* 0x1c */
+		"faultne",	0,	/* 0x1d */
+		"faultle",	0,	/* 0x1e */
+		"faulto",	0,	/* 0x1f */
+	};
+
+	i = (word1 >> 24) & 0xff;
+	if ( (ctrl_tab[i].name == NULL) || ((word1 & 1) != 0) ){
+		invalid( word1 );
+		return;
+	}
+
+	fputs( ctrl_tab[i].name, stream );
+	if ( word1 & 2 ){		/* Predicts branch not taken */
+		fputs( ".f", stream );
+	}
+
+	if ( ctrl_tab[i].numops == 1 ){
+		/* EXTRACT DISPLACEMENT AND CONVERT TO ADDRESS */
+		word1 &= 0x00ffffff;
+		if ( word1 & 0x00800000 ){		/* Sign bit is set */
+			word1 |= (-1 & ~0xffffff);	/* Sign extend */
+		}
+		putc( '\t', stream );
+		print_addr( word1 + memaddr );
+	}
+}
+
+/****************************************/
+/* COBR format				*/
+/****************************************/
+static void
+cobr( memaddr, word1, word2 )
+    unsigned long memaddr;
+    unsigned long word1, word2;
+{
+	int src1;
+	int src2;
+	int i;
+
+	static struct tabent cobr_tab[] = {
+		"testno",	1,	/* 0x20 */
+		"testg",	1,	/* 0x21 */
+		"teste",	1,	/* 0x22 */
+		"testge",	1,	/* 0x23 */
+		"testl",	1,	/* 0x24 */
+		"testne",	1,	/* 0x25 */
+		"testle",	1,	/* 0x26 */
+		"testo",	1,	/* 0x27 */
+		NULL,		0,	/* 0x28 */
+		NULL,		0,	/* 0x29 */
+		NULL,		0,	/* 0x2a */
+		NULL,		0,	/* 0x2b */
+		NULL,		0,	/* 0x2c */
+		NULL,		0,	/* 0x2d */
+		NULL,		0,	/* 0x2e */
+		NULL,		0,	/* 0x2f */
+		"bbc",		3,	/* 0x30 */
+		"cmpobg",	3,	/* 0x31 */
+		"cmpobe",	3,	/* 0x32 */
+		"cmpobge",	3,	/* 0x33 */
+		"cmpobl",	3,	/* 0x34 */
+		"cmpobne",	3,	/* 0x35 */
+		"cmpoble",	3,	/* 0x36 */
+		"bbs",		3,	/* 0x37 */
+		"cmpibno",	3,	/* 0x38 */
+		"cmpibg",	3,	/* 0x39 */
+		"cmpibe",	3,	/* 0x3a */
+		"cmpibge",	3,	/* 0x3b */
+		"cmpibl",	3,	/* 0x3c */
+		"cmpibne",	3,	/* 0x3d */
+		"cmpible",	3,	/* 0x3e */
+		"cmpibo",	3,	/* 0x3f */
+	};
+
+	i = ((word1 >> 24) & 0xff) - 0x20;
+	if ( cobr_tab[i].name == NULL ){
+		invalid( word1 );
+		return;
+	}
+
+	fputs( cobr_tab[i].name, stream );
+	if ( word1 & 2 ){		/* Predicts branch not taken */
+		fputs( ".f", stream );
+	}
+	putc( '\t', stream );
+
+	src1 = (word1 >> 19) & 0x1f;
+	src2 = (word1 >> 14) & 0x1f;
+
+	if ( word1 & 0x02000 ){		/* M1 is 1 */
+		fprintf( stream, "%d", src1 );
+	} else {			/* M1 is 0 */
+		fputs( reg_names[src1], stream );
+	}
+
+	if ( cobr_tab[i].numops > 1 ){
+		if ( word1 & 1 ){		/* S2 is 1 */
+			fprintf( stream, ",sf%d,", src2 );
+		} else {			/* S1 is 0 */
+			fprintf( stream, ",%s,", reg_names[src2] );
+		}
+
+		/* Extract displacement and convert to address
+		 */
+		word1 &= 0x00001ffc;
+		if ( word1 & 0x00001000 ){	/* Negative displacement */
+			word1 |= (-1 & ~0x1fff);	/* Sign extend */
+		}
+		print_addr( memaddr + word1 );
+	}
+}
+
+/****************************************/
+/* MEM format				*/
+/****************************************/
+static int				/* returns instruction length: 4 or 8 */
+mem( memaddr, word1, word2, noprint )
+    unsigned long memaddr;
+    unsigned long word1, word2;
+    int noprint;		/* If TRUE, return instruction length, but
+				 * don't output any text.
+				 */
+{
+	int i, j;
+	int len;
+	int mode;
+	int offset;
+	char *reg1, *reg2, *reg3;
+
+	/* This lookup table is too sparse to make it worth typing in, but not
+	 * so large as to make a sparse array necessary.  We allocate the
+	 * table at runtime, initialize all entries to empty, and copy the
+	 * real ones in from an initialization table.
+	 *
+	 * NOTE: In this table, the meaning of 'numops' is:
+	 *	 1: single operand
+	 *	 2: 2 operands, load instruction
+	 *	-2: 2 operands, store instruction
+	 */
+	static struct tabent *mem_tab = NULL;
+	static struct { int opcode; char *name; char numops; } mem_init[] = {
+#define MEM_MIN	0x80
+		0x80,	"ldob",	 2,
+		0x82,	"stob",	-2,
+		0x84,	"bx",	 1,
+		0x85,	"balx",	 2,
+		0x86,	"callx", 1,
+		0x88,	"ldos",	 2,
+		0x8a,	"stos",	-2,
+		0x8c,	"lda",	 2,
+		0x90,	"ld",	 2,
+		0x92,	"st",	-2,
+		0x98,	"ldl",	 2,
+		0x9a,	"stl",	-2,
+		0xa0,	"ldt",	 2,
+		0xa2,	"stt",	-2,
+		0xb0,	"ldq",	 2,
+		0xb2,	"stq",	-2,
+		0xc0,	"ldib",	 2,
+		0xc2,	"stib",	-2,
+		0xc8,	"ldis",	 2,
+		0xca,	"stis",	-2,
+#define MEM_MAX	0xca
+#define MEM_SIZ	((MEM_MAX-MEM_MIN+1) * sizeof(struct tabent))
+		0,	NULL,	0
+	};
+
+	if ( mem_tab == NULL ){
+		mem_tab = (struct tabent *) xmalloc( MEM_SIZ );
+		bzero( (void *) mem_tab, MEM_SIZ );
+		for ( i = 0; mem_init[i].opcode != 0; i++ ){
+			j = mem_init[i].opcode - MEM_MIN;
+			mem_tab[j].name = mem_init[i].name;
+			mem_tab[j].numops = mem_init[i].numops;
+		}
+	}
+
+	i = ((word1 >> 24) & 0xff) - MEM_MIN;
+	mode = (word1 >> 10) & 0xf;
+
+	if ( (mem_tab[i].name != NULL)		/* Valid instruction */
+	&&   ((mode == 5) || (mode >=12)) ){	/* With 32-bit displacement */
+		len = 8;
+	} else {
+		len = 4;
+	}
+
+	if ( noprint ){
+		return len;
+	}
+
+	if ( (mem_tab[i].name == NULL) || (mode == 6) ){
+		invalid( word1 );
+		return len;
+	}
+
+	fprintf( stream, "%s\t", mem_tab[i].name );
+
+	reg1 = reg_names[ (word1 >> 19) & 0x1f ];	/* MEMB only */
+	reg2 = reg_names[ (word1 >> 14) & 0x1f ];
+	reg3 = reg_names[ word1 & 0x1f ];		/* MEMB only */
+	offset = word1 & 0xfff;				/* MEMA only  */
+
+	switch ( mem_tab[i].numops ){
+
+	case 2: /* LOAD INSTRUCTION */
+		if ( mode & 4 ){			/* MEMB FORMAT */
+			ea( memaddr, mode, reg2, reg3, word1, word2 );
+			fprintf( stream, ",%s", reg1 );
+		} else {				/* MEMA FORMAT */
+			fprintf( stream, "0x%x", (unsigned) offset );
+			if (mode & 8) {
+				fprintf( stream, "(%s)", reg2 );
+			}
+			fprintf( stream, ",%s", reg1 );
+		}
+		break;
+
+	case -2: /* STORE INSTRUCTION */
+		if ( mode & 4 ){			/* MEMB FORMAT */
+			fprintf( stream, "%s,", reg1 );
+			ea( memaddr, mode, reg2, reg3, word1, word2 );
+		} else {				/* MEMA FORMAT */
+			fprintf( stream, "%s,0x%x", reg1, (unsigned) offset );
+			if (mode & 8) {
+				fprintf( stream, "(%s)", reg2 );
+			}
+		}
+		break;
+
+	case 1: /* BX/CALLX INSTRUCTION */
+		if ( mode & 4 ){			/* MEMB FORMAT */
+			ea( memaddr, mode, reg2, reg3, word1, word2 );
+		} else {				/* MEMA FORMAT */
+			fprintf( stream, "0x%x", (unsigned) offset );
+			if (mode & 8) {
+				fprintf( stream, "(%s)", reg2 );
+			}
+		}
+		break;
+	}
+
+	return len;
+}
+
+/****************************************/
+/* REG format				*/
+/****************************************/
+static void
+reg( word1 )
+    unsigned long word1;
+{
+	int i, j;
+	int opcode;
+	int fp;
+	int m1, m2, m3;
+	int s1, s2;
+	int src, src2, dst;
+	char *mnemp;
+
+	/* This lookup table is too sparse to make it worth typing in, but not
+	 * so large as to make a sparse array necessary.  We allocate the
+	 * table at runtime, initialize all entries to empty, and copy the
+	 * real ones in from an initialization table.
+	 *
+	 * NOTE: In this table, the meaning of 'numops' is:
+	 *	 1: single operand, which is NOT a destination.
+	 *	-1: single operand, which IS a destination.
+	 *	 2: 2 operands, the 2nd of which is NOT a destination.
+	 *	-2: 2 operands, the 2nd of which IS a destination.
+	 *	 3: 3 operands
+	 *
+	 *	If an opcode mnemonic begins with "F", it is a floating-point
+	 *	opcode (the "F" is not printed).
+	 */
+
+	static struct tabent *reg_tab = NULL;
+	static struct { int opcode; char *name; char numops; } reg_init[] = {
+#define REG_MIN	0x580
+		0x580,	"notbit",	3,
+		0x581,	"and",		3,
+		0x582,	"andnot",	3,
+		0x583,	"setbit",	3,
+		0x584,	"notand",	3,
+		0x586,	"xor",		3,
+		0x587,	"or",		3,
+		0x588,	"nor",		3,
+		0x589,	"xnor",		3,
+		0x58a,	"not",		-2,
+		0x58b,	"ornot",	3,
+		0x58c,	"clrbit",	3,
+		0x58d,	"notor",	3,
+		0x58e,	"nand",		3,
+		0x58f,	"alterbit",	3,
+		0x590, 	"addo",		3,
+		0x591, 	"addi",		3,
+		0x592, 	"subo",		3,
+		0x593, 	"subi",		3,
+		0x598, 	"shro",		3,
+		0x59a, 	"shrdi",	3,
+		0x59b, 	"shri",		3,
+		0x59c, 	"shlo",		3,
+		0x59d, 	"rotate",	3,
+		0x59e, 	"shli",		3,
+		0x5a0, 	"cmpo",		2,
+		0x5a1, 	"cmpi",		2,
+		0x5a2, 	"concmpo",	2,
+		0x5a3, 	"concmpi",	2,
+		0x5a4, 	"cmpinco",	3,
+		0x5a5, 	"cmpinci",	3,
+		0x5a6, 	"cmpdeco",	3,
+		0x5a7, 	"cmpdeci",	3,
+		0x5ac, 	"scanbyte",	2,
+		0x5ae, 	"chkbit",	2,
+		0x5b0, 	"addc",		3,
+		0x5b2, 	"subc",		3,
+		0x5cc,	"mov",		-2,
+		0x5d8,	"eshro",	3,
+		0x5dc,	"movl",		-2,
+		0x5ec,	"movt",		-2,
+		0x5fc,	"movq",		-2,
+		0x600,	"synmov",	2,
+		0x601,	"synmovl",	2,
+		0x602,	"synmovq",	2,
+		0x603,	"cmpstr",	3,
+		0x604,	"movqstr",	3,
+		0x605,	"movstr",	3,
+		0x610,	"atmod",	3,
+		0x612,	"atadd",	3,
+		0x613,	"inspacc",	-2,
+		0x614,	"ldphy",	-2,
+		0x615,	"synld",	-2,
+		0x617,	"fill",		3,
+		0x630,	"sdma",		3,
+		0x631,	"udma",		0,
+		0x640,	"spanbit",	-2,
+		0x641,	"scanbit",	-2,
+		0x642,	"daddc",	3,
+		0x643,	"dsubc",	3,
+		0x644,	"dmovt",	-2,
+		0x645,	"modac",	3,
+		0x646,	"condrec",	-2,
+		0x650,	"modify",	3,
+		0x651,	"extract",	3,
+		0x654,	"modtc",	3,
+		0x655,	"modpc",	3,
+		0x656,	"receive",	-2,
+		0x659,	"sysctl",	3,
+		0x660,	"calls",	1,
+		0x662,	"send",		3,
+		0x663,	"sendserv",	1,
+		0x664,	"resumprcs",	1,
+		0x665,	"schedprcs",	1,
+		0x666,	"saveprcs",	0,
+		0x668,	"condwait",	1,
+		0x669,	"wait",		1,
+		0x66a,	"signal",	1,
+		0x66b,	"mark",		0,
+		0x66c,	"fmark",	0,
+		0x66d,	"flushreg",	0,
+		0x66f,	"syncf",	0,
+		0x670,	"emul",		3,
+		0x671,	"ediv",		3,
+		0x673, 	"ldtime",	-1,
+		0x674,	"Fcvtir",	-2,
+		0x675,	"Fcvtilr",	-2,
+		0x676,	"Fscalerl",	3,
+		0x677,	"Fscaler",	3,
+		0x680,	"Fatanr",	3,
+		0x681,	"Flogepr",	3,
+		0x682,	"Flogr",	3,
+		0x683,	"Fremr",	3,
+		0x684,	"Fcmpor",	2,
+		0x685,	"Fcmpr",	2,
+		0x688,	"Fsqrtr",	-2,
+		0x689,	"Fexpr",	-2,
+		0x68a,	"Flogbnr",	-2,
+		0x68b,	"Froundr",	-2,
+		0x68c,	"Fsinr",	-2,
+		0x68d,	"Fcosr",	-2,
+		0x68e,	"Ftanr",	-2,
+		0x68f,	"Fclassr",	1,
+		0x690,	"Fatanrl",	3,
+		0x691,	"Flogeprl",	3,
+		0x692,	"Flogrl",	3,
+		0x693,	"Fremrl",	3,
+		0x694,	"Fcmporl",	2,
+		0x695,	"Fcmprl",	2,
+		0x698,	"Fsqrtrl",	-2,
+		0x699,	"Fexprl",	-2,
+		0x69a,	"Flogbnrl",	-2,
+		0x69b,	"Froundrl",	-2,
+		0x69c,	"Fsinrl",	-2,
+		0x69d,	"Fcosrl",	-2,
+		0x69e,	"Ftanrl",	-2,
+		0x69f,	"Fclassrl",	1,
+		0x6c0,	"Fcvtri",	-2,
+		0x6c1,	"Fcvtril",	-2,
+		0x6c2,	"Fcvtzri",	-2,
+		0x6c3,	"Fcvtzril",	-2,
+		0x6c9,	"Fmovr",	-2,
+		0x6d9,	"Fmovrl",	-2,
+		0x6e1, 	"Fmovre",	-2,
+		0x6e2, 	"Fcpysre",	3,
+		0x6e3, 	"Fcpyrsre",	3,
+		0x701,	"mulo",		3,
+		0x708,	"remo",		3,
+		0x70b,	"divo",		3,
+		0x741,	"muli",		3,
+		0x748,	"remi",		3,
+		0x749,	"modi",		3,
+		0x74b,	"divi",		3,
+		0x78b,	"Fdivr",	3,
+		0x78c,	"Fmulr",	3,
+		0x78d,	"Fsubr",	3,
+		0x78f,	"Faddr",	3,
+		0x79b,	"Fdivrl",	3,
+		0x79c,	"Fmulrl",	3,
+		0x79d,	"Fsubrl",	3,
+		0x79f,	"Faddrl",	3,
+#define REG_MAX	0x79f
+#define REG_SIZ	((REG_MAX-REG_MIN+1) * sizeof(struct tabent))
+		0,	NULL,	0
+	};
+
+	if ( reg_tab == NULL ){
+		reg_tab = (struct tabent *) xmalloc( REG_SIZ );
+		bzero( (void *) reg_tab, REG_SIZ );
+		for ( i = 0; reg_init[i].opcode != 0; i++ ){
+			j = reg_init[i].opcode - REG_MIN;
+			reg_tab[j].name = reg_init[i].name;
+			reg_tab[j].numops = reg_init[i].numops;
+		}
+	}
+
+	opcode = ((word1 >> 20) & 0xff0) | ((word1 >> 7) & 0xf);
+	i = opcode - REG_MIN;
+
+	if ( (opcode<REG_MIN) || (opcode>REG_MAX) || (reg_tab[i].name==NULL) ){
+		invalid( word1 );
+		return;
+	}
+
+	mnemp = reg_tab[i].name;
+	if ( *mnemp == 'F' ){
+		fp = 1;
+		mnemp++;
+	} else {
+		fp = 0;
+	}
+
+	fputs( mnemp, stream );
+
+	s1   = (word1 >> 5)  & 1;
+	s2   = (word1 >> 6)  & 1;
+	m1   = (word1 >> 11) & 1;
+	m2   = (word1 >> 12) & 1;
+	m3   = (word1 >> 13) & 1;
+	src  =  word1        & 0x1f;
+	src2 = (word1 >> 14) & 0x1f;
+	dst  = (word1 >> 19) & 0x1f;
+
+	if  ( reg_tab[i].numops != 0 ){
+		putc( '\t', stream );
+
+		switch ( reg_tab[i].numops ){
+		case 1:
+			regop( m1, s1, src, fp );
+			break;
+		case -1:
+			dstop( m3, dst, fp );
+			break;
+		case 2:
+			regop( m1, s1, src, fp );
+			putc( ',', stream );
+			regop( m2, s2, src2, fp );
+			break;
+		case -2:
+			regop( m1, s1, src, fp );
+			putc( ',', stream );
+			dstop( m3, dst, fp );
+			break;
+		case 3:
+			regop( m1, s1, src, fp );
+			putc( ',', stream );
+			regop( m2, s2, src2, fp );
+			putc( ',', stream );
+			dstop( m3, dst, fp );
+			break;
+		}
+	}
+}
+
+
+/*
+ * Print out effective address for memb instructions.
+ */
+static void
+ea( memaddr, mode, reg2, reg3, word1, word2 )
+    unsigned long memaddr;
+    int mode;
+    char *reg2, *reg3;
+int word1;
+    unsigned int word2;
+{
+	int scale;
+	static int scale_tab[] = { 1, 2, 4, 8, 16 };
+
+	scale = (word1 >> 7) & 0x07;
+	if ( (scale > 4) || ((word1 >> 5) & 0x03 != 0) ){
+		invalid( word1 );
+		return;
+	}
+	scale = scale_tab[scale];
+
+	switch (mode) {
+	case 4:	 					/* (reg) */
+		fprintf( stream, "(%s)", reg2 );
+		break;
+	case 5:						/* displ+8(ip) */
+		print_addr( word2+8+memaddr );
+		break;
+	case 7:						/* (reg)[index*scale] */
+		if (scale == 1) {
+			fprintf( stream, "(%s)[%s]", reg2, reg3 );
+		} else {
+			fprintf( stream, "(%s)[%s*%d]",reg2,reg3,scale);
+		}
+		break;
+	case 12:					/* displacement */
+		print_addr( word2 );
+		break;
+	case 13:					/* displ(reg) */
+		print_addr( word2 );
+		fprintf( stream, "(%s)", reg2 );
+		break;
+	case 14:					/* displ[index*scale] */
+		print_addr( word2 );
+		if (scale == 1) {
+			fprintf( stream, "[%s]", reg3 );
+		} else {
+			fprintf( stream, "[%s*%d]", reg3, scale );
+		}
+		break;
+	case 15:				/* displ(reg)[index*scale] */
+		print_addr( word2 );
+		if (scale == 1) {
+			fprintf( stream, "(%s)[%s]", reg2, reg3 );
+		} else {
+			fprintf( stream, "(%s)[%s*%d]",reg2,reg3,scale );
+		}
+		break;
+	default:
+		invalid( word1 );
+		return;
+	}
+}
+
+
+/************************************************/
+/* Register Instruction Operand  		*/
+/************************************************/
+static void
+regop( mode, spec, reg, fp )
+    int mode, spec, reg, fp;
+{
+	if ( fp ){				/* FLOATING POINT INSTRUCTION */
+		if ( mode == 1 ){			/* FP operand */
+			switch ( reg ){
+			case 0:  fputs( "fp0", stream );	break;
+			case 1:  fputs( "fp1", stream );	break;
+			case 2:  fputs( "fp2", stream );	break;
+			case 3:  fputs( "fp3", stream );	break;
+			case 16: fputs( "0f0.0", stream );	break;
+			case 22: fputs( "0f1.0", stream );	break;
+			default: putc( '?', stream );		break;
+			}
+		} else {				/* Non-FP register */
+			fputs( reg_names[reg], stream );
+		}
+	} else {				/* NOT FLOATING POINT */
+		if ( mode == 1 ){			/* Literal */
+			fprintf( stream, "%d", reg );
+		} else {				/* Register */
+			if ( spec == 0 ){
+				fputs( reg_names[reg], stream );
+			} else {
+				fprintf( stream, "sf%d", reg );
+			}
+		}
+	}
+}
+
+/************************************************/
+/* Register Instruction Destination Operand	*/
+/************************************************/
+static void
+dstop( mode, reg, fp )
+    int mode, reg, fp;
+{
+	/* 'dst' operand can't be a literal. On non-FP instructions,  register
+	 * mode is assumed and "m3" acts as if were "s3";  on FP-instructions,
+	 * sf registers are not allowed so m3 acts normally.
+	 */
+	 if ( fp ){
+		regop( mode, 0, reg, fp );
+	 } else {
+		regop( 0, mode, reg, fp );
+	 }
+}
+
+
+static void
+invalid( word1 )
+    int word1;
+{
+	fprintf( stream, ".word\t0x%08x", (unsigned) word1 );
+}	
+
+static void
+print_addr(a)
+int a;
+{
+	fprintf( stream, "0x%x", (unsigned) a );
+}
+
+static void
+put_abs( word1, word2 )
+    unsigned long word1, word2;
+{
+#ifdef IN_GDB
+	return;
+#else
+	int len;
+
+	switch ( (word1 >> 28) & 0xf ){
+	case 0x8:
+	case 0x9:
+	case 0xa:
+	case 0xb:
+	case 0xc:
+		/* MEM format instruction */
+		len = mem( 0, word1, word2, 1 );
+		break;
+	default:
+		len = 4;
+		break;
+	}
+
+	if ( len == 8 ){
+		fprintf( stream, "%08x %08x\t", word1, word2 );
+	} else {
+		fprintf( stream, "%08x         \t", word1 );
+	}
+;
+
+#endif
+}