i960-dis.c

来自「基于4个mips核的noc设计」· C语言 代码 · 共 917 行 · 第 1/2 页

/* Disassemble i80960 instructions.
   Copyright 1990, 1991, 1993, 1994, 1995, 1996, 1998, 1999, 2000
   Free Software Foundation, Inc.

This program 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 2, or (at your option)
any later version.

This program 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 this program; see the file COPYING.  If not, write to the
Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

#include "sysdep.h"
#include "dis-asm.h"

static const char *const 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 struct disassemble_info *info;
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 INFO->STREAM.  Returns length of the instruction, in bytes.  */

int
print_insn_i960 (memaddr, info_arg)
    bfd_vma memaddr;
    struct disassemble_info *info_arg;
{
  unsigned int word1, word2 = 0xdeadbeef;
  bfd_byte buffer[8];
  int status;

  info = info_arg;
  stream = info->stream;

  /* Read word1.  Only read word2 if the instruction
     needs it, to prevent reading past the end of a section.  */

  status = (*info->read_memory_func) (memaddr, (bfd_byte *) buffer, 4, info);
  if (status != 0)
    {
      (*info->memory_error_func) (status, memaddr, info);
      return -1;
    }

  word1 = bfd_getl32 (buffer);

  /* Divide instruction set into classes based on high 4 bits of opcode.  */
  switch ( (word1 >> 28) & 0xf )
    {
    default:
      break;
    case 0x8:
    case 0x9:
    case 0xa:
    case 0xb:
    case 0xc:
      /* Read word2.  */
      status = (*info->read_memory_func)
	(memaddr + 4, (bfd_byte *) (buffer + 4), 4, info);
      if (status != 0)
	{
	  (*info->memory_error_func) (status, memaddr, info);
	  return -1;
	}
      word2 = bfd_getl32 (buffer + 4);
      break;
    }

  return pinsn( memaddr, word1, word2 );
}

#define IN_GDB

/*****************************************************************************
 *	All code below this point should be identical with that of
 *	the disassembler in gdmp960.

 A noble sentiment, but at least in cosmetic ways (info->fprintf_func), it
 just ain't so. -kingdon, 31 Mar 93
 *****************************************************************************/

struct tabent {
  char *name;
  short numops;
};

struct sparse_tabent {
  int opcode;
  char *name;
  short numops;
};

static int
pinsn( memaddr, word1, word2 )
    bfd_vma 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 )
    bfd_vma memaddr;
    unsigned long word1, word2;
{
	int i;
	static const 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;
	}

	(*info->fprintf_func) ( stream, ctrl_tab[i].name );
	if ( word1 & 2 ){		/* Predicts branch not taken */
		(*info->fprintf_func) ( stream, ".f" );
	}

	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 */
		}
		(*info->fprintf_func)( stream, "\t" );
		print_addr( word1 + memaddr );
	}
}

/****************************************/
/* COBR format				*/
/****************************************/
static void
cobr( memaddr, word1, word2 )
    bfd_vma memaddr;
    unsigned long word1, word2;
{
	int src1;
	int src2;
	int i;

	static const 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;
	}

	(*info->fprintf_func) ( stream, cobr_tab[i].name );
	if ( word1 & 2 ){		/* Predicts branch not taken */
		(*info->fprintf_func) ( stream, ".f" );
	}
	(*info->fprintf_func)( stream, "\t" );

	src1 = (word1 >> 19) & 0x1f;
	src2 = (word1 >> 14) & 0x1f;

	if ( word1 & 0x02000 ){		/* M1 is 1 */
		(*info->fprintf_func)( stream, "%d", src1 );
	} else {			/* M1 is 0 */
		(*info->fprintf_func)( stream, reg_names[src1] );
	}

	if ( cobr_tab[i].numops > 1 ){
		if ( word1 & 1 ){		/* S2 is 1 */
			(*info->fprintf_func)( stream, ",sf%d,", src2 );
		} else {			/* S1 is 0 */
			(*info->fprintf_func)( 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 )
    bfd_vma 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;
	const 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 create the table
	   at runtime.  */

	/*
	 * 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;
/* Opcodes of 0x8X, 9X, aX, bX, and cX must be in the table.  */
#define MEM_MIN	0x80
#define MEM_MAX	0xcf
#define MEM_SIZ	( * sizeof(struct tabent))

	static const struct sparse_tabent mem_init[] = {
	  { 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 },
	  { 0xac,	"dcinva", 1 },
	  { 0xb0,	"ldq",	 2 },
	  { 0xb2,	"stq",	-2 },
	  { 0xc0,	"ldib",	 2 },
	  { 0xc2,	"stib",	-2 },
	  { 0xc8,	"ldis",	 2 },
	  { 0xca,	"stis",	-2 },
	  { 0,		NULL,	0 }
	};
	static struct tabent mem_tab_buf[MEM_MAX - MEM_MIN + 1];

	if ( mem_tab == NULL ){
		mem_tab = mem_tab_buf;
		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;
	}

	(*info->fprintf_func)( 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 );
			(*info->fprintf_func)( stream, ",%s", reg1 );
		} else {				/* MEMA FORMAT */
			(*info->fprintf_func)( stream, "0x%x", (unsigned) offset );
			if (mode & 8) {
				(*info->fprintf_func)( stream, "(%s)", reg2 );
			}
			(*info->fprintf_func)( stream, ",%s", reg1 );
		}
		break;

	case -2: /* STORE INSTRUCTION */
		if ( mode & 4 ){			/* MEMB FORMAT */
			(*info->fprintf_func)( stream, "%s,", reg1 );
			ea( memaddr, mode, reg2, reg3, word1, word2 );
		} else {				/* MEMA FORMAT */
			(*info->fprintf_func)( stream, "%s,0x%x", reg1, (unsigned) offset );
			if (mode & 8) {
				(*info->fprintf_func)( stream, "(%s)", reg2 );
			}
		}
		break;

	case 1: /* BX/CALLX INSTRUCTION */
		if ( mode & 4 ){			/* MEMB FORMAT */
			ea( memaddr, mode, reg2, reg3, word1, word2 );
		} else {				/* MEMA FORMAT */
			(*info->fprintf_func)( stream, "0x%x", (unsigned) offset );
			if (mode & 8) {
				(*info->fprintf_func)( 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;