6ad6ef422c
* tm-m88k.h, tm-umax.h: Avoid sizeof() in REGISTER_xxx macros, since they define the target, not the host. * m88k-pinsn.c: Fix typo. Patches by Paul Eggert <eggert@twinsun.com>. * valarith.c (value_zerop): -0.0 is still zero. * eval.c (evaluate_subexp): Avoid NaN anomalies in float compares.
358 lines
9.0 KiB
C
358 lines
9.0 KiB
C
/* Print instructions for the Motorola 88000, for GDB and GNU Binutils.
|
||
Copyright 1986, 1987, 1988, 1989, 1990, 1991 Free Software Foundation, Inc.
|
||
Contributed by Data General Corporation, November 1989.
|
||
Partially derived from an earlier printcmd.c.
|
||
|
||
This file is part of GDB and the GNU Binutils.
|
||
|
||
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 of the License, 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; if not, write to the Free Software
|
||
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "opcode/m88k.h"
|
||
#include "symtab.h"
|
||
|
||
void sprint_address ();
|
||
|
||
INSTAB *hashtable[HASHVAL] = {0};
|
||
|
||
/*
|
||
* Disassemble an M88000 Instruction
|
||
*
|
||
*
|
||
* This module decodes the first instruction in inbuf. It uses the pc
|
||
* to display pc-relative displacements. It writes the disassembled
|
||
* instruction in outbuf.
|
||
*
|
||
* Revision History
|
||
*
|
||
* Revision 1.0 11/08/85 Creation date by Motorola
|
||
* 05/11/89 R. Trawick adapted to GDB interface.
|
||
*/
|
||
#define MAXLEN 20
|
||
|
||
print_insn (memaddr, stream)
|
||
CORE_ADDR memaddr;
|
||
FILE *stream;
|
||
{
|
||
unsigned char buffer[MAXLEN];
|
||
/* should be expanded if disassembler prints symbol names */
|
||
char outbuf[100];
|
||
int n;
|
||
|
||
/* Instruction addresses may have low two bits set. Clear them. */
|
||
memaddr&= 0xfffffffc;
|
||
read_memory (memaddr, buffer, MAXLEN);
|
||
|
||
n = m88kdis ((int)memaddr, buffer, outbuf);
|
||
|
||
fputs (outbuf, stream);
|
||
|
||
return (n);
|
||
}
|
||
|
||
/*
|
||
* disassemble the first instruction in 'inbuf'.
|
||
* 'pc' should be the address of this instruction, it will
|
||
* be used to print the target address if this is a relative jump or call
|
||
* 'outbuf' gets filled in with the disassembled instruction. It should
|
||
* be long enough to hold the longest disassembled instruction.
|
||
* 100 bytes is certainly enough, unless symbol printing is added later
|
||
* The function returns the length of this instruction in bytes.
|
||
*/
|
||
|
||
int m88kdis( pc, inbuf, outbuf )
|
||
|
||
int pc;
|
||
int *inbuf;
|
||
char *outbuf;
|
||
|
||
{ static ihashtab_initialized = 0;
|
||
int instruction;
|
||
unsigned int opcode;
|
||
INSTAB *entry_ptr;
|
||
int opmask;
|
||
int class;
|
||
|
||
instruction= *inbuf;
|
||
|
||
if (!ihashtab_initialized) {
|
||
init_disasm();
|
||
}
|
||
|
||
/* create a the appropriate mask to isolate the opcode */
|
||
opmask= DEFMASK;
|
||
class= instruction & DEFMASK;
|
||
if ((class >= SFU0) && (class <= SFU7)) {
|
||
if (instruction < SFU1) {
|
||
opmask= CTRLMASK;
|
||
} else {
|
||
opmask= SFUMASK;
|
||
}
|
||
} else if (class == RRR) {
|
||
opmask= RRRMASK;
|
||
} else if (class == RRI10) {
|
||
opmask= RRI10MASK;
|
||
}
|
||
|
||
/* isolate the opcode */
|
||
opcode= instruction & opmask;
|
||
|
||
/* search the hash table with the isolated opcode */
|
||
for (entry_ptr= hashtable[ opcode % HASHVAL ];
|
||
(entry_ptr != NULL) && (entry_ptr->opcode != opcode);
|
||
entry_ptr= entry_ptr->next) {
|
||
}
|
||
|
||
if (entry_ptr == NULL) {
|
||
sprintf( outbuf, "word\t%08x", instruction );
|
||
} else {
|
||
sprintf( outbuf, "%s\t", entry_ptr->mnemonic );
|
||
sprintop( &outbuf[strlen(outbuf)], &(entry_ptr->op1), instruction, pc, 1 );
|
||
sprintop( &outbuf[strlen(outbuf)], &(entry_ptr->op2), instruction, pc, 0 );
|
||
sprintop( &outbuf[strlen(outbuf)], &(entry_ptr->op3), instruction, pc, 0 );
|
||
}
|
||
|
||
|
||
return 4;
|
||
}
|
||
|
||
|
||
/*
|
||
* Decode an Operand of an Instruction
|
||
*
|
||
* Functional Description
|
||
*
|
||
* This module formats and writes an operand of an instruction to buf
|
||
* based on the operand specification. When the first flag is set this
|
||
* is the first operand of an instruction. Undefined operand types
|
||
* cause a <dis error> message.
|
||
*
|
||
* Parameters
|
||
* char *buf buffer where the operand may be printed
|
||
* OPSPEC *opptr Pointer to an operand specification
|
||
* UINT inst Instruction from which operand is extracted
|
||
* UINT pc PC of instruction; used for pc-relative disp.
|
||
* int first Flag which if nonzero indicates the first
|
||
* operand of an instruction
|
||
*
|
||
* Output
|
||
*
|
||
* The operand specified is extracted from the instruction and is
|
||
* written to buf in the format specified. The operand is preceded
|
||
* by a comma if it is not the first operand of an instruction and it
|
||
* is not a register indirect form. Registers are preceded by 'r' and
|
||
* hex values by '0x'.
|
||
*
|
||
* Revision History
|
||
*
|
||
* Revision 1.0 11/08/85 Creation date
|
||
*/
|
||
|
||
sprintop( buf, opptr, inst, pc, first )
|
||
|
||
char *buf;
|
||
OPSPEC *opptr;
|
||
UINT inst;
|
||
int pc;
|
||
int first;
|
||
|
||
{ int extracted_field;
|
||
char *cond_mask_sym;
|
||
char cond_mask_sym_buf[6];
|
||
|
||
if (opptr->width == 0)
|
||
return;
|
||
|
||
switch(opptr->type) {
|
||
case CRREG:
|
||
if (!first)
|
||
*buf++= ',';
|
||
sprintf( buf, "cr%d", UEXT(inst,opptr->offset,opptr->width));
|
||
break;
|
||
|
||
case FCRREG:
|
||
if (!first)
|
||
*buf++= ',';
|
||
sprintf( buf, "fcr%d", UEXT(inst,opptr->offset,opptr->width));
|
||
break;
|
||
|
||
case REGSC:
|
||
sprintf( buf, "[r%d]", UEXT(inst,opptr->offset,opptr->width));
|
||
break;
|
||
|
||
case REG:
|
||
if (!first)
|
||
*buf++= ',';
|
||
sprintf( buf, "r%d", UEXT(inst,opptr->offset,opptr->width));
|
||
break;
|
||
|
||
case HEX:
|
||
if (!first)
|
||
*buf++= ',';
|
||
extracted_field= UEXT(inst, opptr->offset, opptr->width);
|
||
if (extracted_field == 0) {
|
||
sprintf( buf, "0" );
|
||
} else {
|
||
sprintf( buf, "0x%02x", extracted_field );
|
||
}
|
||
break;
|
||
|
||
case CONDMASK:
|
||
if (!first)
|
||
*buf++= ',';
|
||
extracted_field= UEXT(inst, opptr->offset, opptr->width);
|
||
switch (extracted_field & 0x0f) {
|
||
case 0x1: cond_mask_sym= "gt0";
|
||
break;
|
||
case 0x2: cond_mask_sym= "eq0";
|
||
break;
|
||
case 0x3: cond_mask_sym= "ge0";
|
||
break;
|
||
case 0xc: cond_mask_sym= "lt0";
|
||
break;
|
||
case 0xd: cond_mask_sym= "ne0";
|
||
break;
|
||
case 0xe: cond_mask_sym= "le0";
|
||
break;
|
||
default: cond_mask_sym= cond_mask_sym_buf;
|
||
sprintf( cond_mask_sym_buf,
|
||
"%x",
|
||
extracted_field );
|
||
break;
|
||
}
|
||
strcpy( buf, cond_mask_sym );
|
||
break;
|
||
|
||
case PCREL:
|
||
if (!first)
|
||
*buf++= ',';
|
||
sprint_address( pc + 4*(SEXT(inst,opptr->offset,opptr->width)),
|
||
buf );
|
||
break;
|
||
|
||
case CONT:
|
||
sprintf( buf,
|
||
"%d,r%d",
|
||
UEXT(inst,opptr->offset,5),
|
||
UEXT(inst,(opptr->offset)+5,5) );
|
||
break;
|
||
|
||
case BF:
|
||
if (!first)
|
||
*buf++= ',';
|
||
sprintf( buf,
|
||
"%d<%d>",
|
||
UEXT(inst,(opptr->offset)+5,5),
|
||
UEXT(inst,opptr->offset,5));
|
||
break;
|
||
|
||
default:
|
||
sprintf( buf, "<dis error: %08x>", inst );
|
||
}
|
||
|
||
}
|
||
|
||
/*
|
||
* Initialize the Disassembler Instruction Table
|
||
*
|
||
* Initialize the hash table and instruction table for the disassembler.
|
||
* This should be called once before the first call to disasm().
|
||
*
|
||
* Parameters
|
||
*
|
||
* Output
|
||
*
|
||
* If the debug option is selected, certain statistics about the hashing
|
||
* distribution are written to stdout.
|
||
*
|
||
* Revision History
|
||
*
|
||
* Revision 1.0 11/08/85 Creation date
|
||
*/
|
||
|
||
init_disasm()
|
||
{
|
||
int i,size;
|
||
|
||
for (i=0 ; i < HASHVAL ; i++)
|
||
hashtable[i] = NULL;
|
||
|
||
for (i=0, size = sizeof(instructions) / sizeof(INSTAB) ; i < size ;
|
||
install(&instructions[i++]));
|
||
|
||
}
|
||
|
||
/*
|
||
* Insert an instruction into the disassembler table by hashing the
|
||
* opcode and inserting it into the linked list for that hash value.
|
||
*
|
||
* Parameters
|
||
*
|
||
* INSTAB *instptr Pointer to the entry in the instruction table
|
||
* to be installed
|
||
*
|
||
* Revision 1.0 11/08/85 Creation date
|
||
* 05/11/89 R. TRAWICK ADAPTED FROM MOTOROLA
|
||
*/
|
||
|
||
install(instptr)
|
||
INSTAB *instptr;
|
||
{
|
||
UINT i;
|
||
|
||
i = (instptr->opcode) % HASHVAL;
|
||
instptr->next = hashtable[i];
|
||
hashtable[i] = instptr;
|
||
}
|
||
|
||
|
||
/* adapted from print_address in printcmd by R. Trawick 5/15/89. The two should
|
||
be combined.
|
||
*/
|
||
|
||
void sprint_address (addr, buffer)
|
||
|
||
CORE_ADDR addr;
|
||
char *buffer;
|
||
|
||
{
|
||
struct minimal_symbol *msymbol;
|
||
struct symbol *fs;
|
||
char *name;
|
||
int name_location;
|
||
|
||
sprintf ( buffer, "0x%x", addr);
|
||
|
||
fs = find_pc_function (addr);
|
||
|
||
if (!fs) {
|
||
msymbol = lookup_minimal_symbol_by_pc (addr);
|
||
|
||
if (msymbol == NULL) return; /* If nothing comes through, don't
|
||
print anything symbolic */
|
||
|
||
name = msymbol -> name;
|
||
name_location = msymbol -> address;
|
||
} else {
|
||
name = fs->name;
|
||
name_location = BLOCK_START (SYMBOL_BLOCK_VALUE (fs));
|
||
}
|
||
|
||
if (addr - name_location)
|
||
sprintf (buffer, " <%s+%d>", name, addr - name_location);
|
||
else
|
||
sprintf (buffer, " <%s>", name);
|
||
}
|