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32010dsm.c
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1999-08-02
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11KB
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340 lines
/****************************************************************************
* Texas Instruments TMS320C10 DSP Disassembler *
* *
* Copyright (C) 1999 by Quench *
* You are not allowed to distribute this software commercially. *
* Written for the MAME project. *
* Many thanks to those involved in the i8039 Disassembler *
* as this was borrowed from it (and modified) *
* *
* To be used with TMS320C10 DSP Emulator engine. *
* *
* *
* A Memory address *
* B Branch Address for Branch instructions (Requires next opcode read) *
* D Immediate byte load *
* K Immediate bit load *
* W Immediate word load (Actually 13 bit) *
* M AR[x] register modification type (for indirect addressing) *
* N ARP register to change ARP pointer to (for indirect addressing) *
* P I/O port address number *
* R AR[R] register to use *
* S Shift ALU left *
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "memory.h"
#ifdef MAME_DEBUG
#include "mamedbg.h"
#endif
typedef unsigned char byte;
typedef unsigned short int word;
#define FMT(a,b) a, b
#define PTRS_PER_FORMAT 2
#ifdef LSB_FIRST
#define READOP16(a) ((cpu_readop(a)<<8)|cpu_readop((a)+1))
#define READARG16(a) ((cpu_readop_arg(a)<<8)|cpu_readop_arg((a)+1))
#else
#define READOP16(a) ((cpu_readop(a))|(cpu_readop((a)+1)<<8))
#define READARG16(a) ((cpu_readop_arg(a))|(cpu_readop_arg((a)+1)<<8))
#endif
char *arith[4] = { "*" , "*-" , "*+" , "??" } ;
char *nextar[4] = { ",AR0" , ",AR1" , "" , "" } ;
char *TMSFormats[] = {
FMT("0000ssss0aaaaaaa", "add %A%S"),
FMT("0000ssss10mmn00n", "add %M%S%N"),
FMT("0001ssss0aaaaaaa", "sub %A%S"),
FMT("0001ssss10mmn00n", "sub %M%S%N"),
FMT("0010ssss0aaaaaaa", "lac %A%S"),
FMT("0010ssss10mmn00n", "lac %M%S%N"),
FMT("0011000r0aaaaaaa", "sar %R,%A"),
FMT("0011000r10mmn00n", "sar %R%M%N"),
FMT("0011100r0aaaaaaa", "lar %R,%A"),
FMT("0011100r10mmn00n", "lar %R%M%N"),
FMT("01000ppp0aaaaaaa", "in %A,%P"),
FMT("01000ppp10mmn00n", "in %M,%P%N"),
FMT("01001ppp0aaaaaaa", "out %A,%P"),
FMT("01001ppp10mmn00n", "out %M,%P%N"),
FMT("01010sss0aaaaaaa", "sacl %A"), /* This instruction has a shift but */
FMT("01010sss10mmn00n", "sacl %M%N"), /* is documented as not performed */
FMT("01011sss0aaaaaaa", "sach %A%S"),
FMT("01011sss10mmn00n", "sach %M%S%N"),
FMT("011000000aaaaaaa", "addh %A"),
FMT("0110000010mmn00n", "addh %M%N"),
FMT("011000010aaaaaaa", "adds %A"),
FMT("0110000110mmn00n", "adds %M%N"),
FMT("011000100aaaaaaa", "subh %A"),
FMT("0110001010mmn00n", "subh %M%N"),
FMT("011000110aaaaaaa", "subs %A"),
FMT("0110001110mmn00n", "subs %M%N"),
FMT("011001000aaaaaaa", "subc %A"),
FMT("0110010010mmn00n", "subc %M%N"),
FMT("011001010aaaaaaa", "zalh %A"),
FMT("0110010110mmn00n", "zalh %M%N"),
FMT("011001100aaaaaaa", "zals %A"),
FMT("0110011010mmn00n", "zals %M%N"),
FMT("011001110aaaaaaa", "tblr %A"),
FMT("0110011110mmn00n", "tblr %M%N"),
FMT("011010001000000k", "larp %K"),
FMT("011010000aaaaaaa", "mar %A"), /* Actually this is executed as a NOP */
/* FMT("0110100010mmn00n", "mar %M%N"), */
/* MAR indirect has been expanded out to all its variations because one of */
/* its opcodes is the same as LARP (actually performs the same function) */
FMT("0110100010001000", "mar *"),
FMT("0110100010001001", "mar *"),
FMT("0110100010010000", "mar *-,AR0"),
FMT("0110100010010001", "mar *-,AR1"),
FMT("0110100010011000", "mar *-"),
FMT("0110100010011001", "mar *-"),
FMT("0110100010100000", "mar *+,AR0"),
FMT("0110100010100001", "mar *+,AR1"),
FMT("0110100010101000", "mar *+"),
FMT("0110100010101001", "mar *+"),
FMT("0110100010110000", "mar ??,AR0"),
FMT("0110100010110001", "mar ??,AR1"),
FMT("0110100010111000", "mar ??"),
FMT("0110100010111001", "mar ??"),
FMT("011010010aaaaaaa", "dmov %A"),
FMT("0110100110mmn00n", "dmov %M%N"),
FMT("011010100aaaaaaa", "lt %A"),
FMT("0110101010mmn00n", "lt %M%N"),
FMT("011010110aaaaaaa", "ltd %A"),
FMT("0110101110mmn00n", "ltd %M%N"),
FMT("011011000aaaaaaa", "lta %A"),
FMT("0110110010mmn00n", "lta %M%N"),
FMT("011011010aaaaaaa", "mpy %A"),
FMT("0110110110mmn00n", "mpy %M%N"),
FMT("011011100000000k", "ldpk %K"),
FMT("011011110aaaaaaa", "ldp %A"),
FMT("0110111110mmn00n", "ldp %M%N"),
FMT("0111000rdddddddd", "lark %R,%D"),
FMT("011110000aaaaaaa", "xor %A"),
FMT("0111100010mmn00n", "xor %M%N"),
FMT("011110010aaaaaaa", "and %A"),
FMT("0111100110mmn00n", "and %M%N"),
FMT("011110100aaaaaaa", "or %A"),
FMT("0111101010mmn00n", "or %M%N"),
FMT("011110110aaaaaaa", "lst %A"),
FMT("0111101110mmn00n", "lst %M%N"),
FMT("011111000aaaaaaa", "sst %A"),
FMT("0111110010mmn00n", "sst %M%N"),
FMT("011111010aaaaaaa", "tblw %A"),
FMT("0111110110mmn00n", "tblw %M%N"),
FMT("01111110dddddddd", "lack %D"),
FMT("0111111110000000", "nop"), /* 7F80 */
FMT("0111111110000001", "dint"),
FMT("0111111110000010", "eint"),
FMT("0111111110001000", "abs"), /* 7F88 */
FMT("0111111110001001", "zac"),
FMT("0111111110001010", "rovm"),
FMT("0111111110001011", "sovm"),
FMT("0111111110001100", "cala"),
FMT("0111111110001101", "ret"),
FMT("0111111110001110", "pac"),
FMT("0111111110001111", "apac"),
FMT("0111111110010000", "spac"),
FMT("0111111110011100", "push"),
FMT("0111111110011101", "pop"), /* 7F9D */
FMT("100wwwwwwwwwwwww", "mpyk %W"),
FMT("1111010000000000bbbbbbbbbbbbbbbb", "banz %B"),
FMT("1111010100000000bbbbbbbbbbbbbbbb", "bv %B"),
FMT("1111011000000000bbbbbbbbbbbbbbbb", "bioz %B"),
FMT("1111100000000000bbbbbbbbbbbbbbbb", "call %B"),
FMT("1111100100000000bbbbbbbbbbbbbbbb", "b %B"),
FMT("1111101000000000bbbbbbbbbbbbbbbb", "blz %B"),
FMT("1111101100000000bbbbbbbbbbbbbbbb", "blez %B"),
FMT("1111110000000000bbbbbbbbbbbbbbbb", "bgz %B"),
FMT("1111110100000000bbbbbbbbbbbbbbbb", "bgez %B"),
FMT("1111111000000000bbbbbbbbbbbbbbbb", "bnz %B"),
FMT("1111111100000000bbbbbbbbbbbbbbbb", "bz %B"),
NULL
};
#define MAX_OPS (((sizeof(TMSFormats) / sizeof(TMSFormats[0])) - 1) / PTRS_PER_FORMAT)
typedef struct opcode {
word mask; /* instruction mask */
word bits; /* constant bits */
word extcode; /* value that gets extension code */
char *parse; /* how to parse bits */
char *fmt; /* instruction format */
} TMS32010Opcode;
static TMS32010Opcode Op[MAX_OPS+1];
static int OpInizialized = 0;
static void InitDasm32010(void)
{
char *p, **ops;
word mask, bits;
int bit;
int i;
ops = TMSFormats; i = 0;
while (*ops)
{
p = *ops;
mask = 0; bits = 0; bit = 15;
while (*p && bit >= 0)
{
switch (*p++)
{
case '1': mask |= 1<<bit; bits |= 1<<bit; bit--; break;
case '0': mask |= 1<<bit; bit--; break;
case ' ': break;
case 'a':
case 'b':
case 'd':
case 'k':
case 'm':
case 'n':
case 'p':
case 'r':
case 's':
case 'w':
bit --;
break;
default: printf("Invalid instruction encoding '%s %s'\n",
ops[0],ops[1]);
exit(1);
}
}
if (bit != -1 )
{
printf("not enough bits in encoding '%s %s' %d\n",
ops[0],ops[1],bit);
exit(1);
}
while (isspace(*p)) p++;
if (*p) Op[i].extcode = *p;
Op[i].bits = bits;
Op[i].mask = mask;
Op[i].fmt = ops[1];
Op[i].parse = ops[0];
ops += PTRS_PER_FORMAT;
i++;
}
OpInizialized = 1;
}
int Dasm32010(char *str, unsigned pc)
{
int a, b, d, k, m, n, p, r, s, w; /* these can all be filled in by parsing an instruction */
int i;
int op;
int cnt = 1;
int code;
int bit;
char *strtmp;
char *cp; /* character pointer in OpFormats */
if (!OpInizialized) InitDasm32010();
op = -1; /* no matching opcode */
code = READOP16(2*pc);
for ( i = 0; i < MAX_OPS; i++)
{
if ((code & Op[i].mask) == Op[i].bits)
{
if (op != -1)
{
printf("Error: opcode %04Xh matches %d (%s) and %d (%s)\n",
code,i,Op[i].fmt,op,Op[op].fmt);
}
op = i;
}
}
if (op == -1)
{
sprintf(str,"???? dw %04Xh",code);
return cnt;
}
strtmp = str;
if (Op[op].extcode)
{
bit = 31;
code <<= 16;
code |= READARG16(2*(pc+cnt));
cnt++;
}
else
{
bit = 15;
}
/* shift out operands */
cp = Op[op].parse;
a = b = d = k = m = n = p = r = s = w = 0;
while (bit >= 0)
{
/* printf("{%c/%d}",*cp,bit); */
switch(*cp)
{
case 'a': a <<=1; a |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case 'b': b <<=1; b |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case 'd': d <<=1; d |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case 'k': k <<=1; k |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case 'm': m <<=1; m |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case 'n': n <<=1; n |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case 'p': p <<=1; p |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case 'r': r <<=1; r |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case 's': s <<=1; s |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case 'w': w <<=1; w |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case ' ': break;
case '1': case '0': bit--; break;
case '\0': printf("premature end of parse string, opcode %x, bit = %d\n",code,bit); exit(1);
}
cp++;
}
/* now traverse format string */
cp = Op[op].fmt;
while (*cp)
{
if (*cp == '%')
{
char num[15], *q;
cp++;
switch (*cp++)
{
case 'A': sprintf(num,"$%02X",a); break;
case 'B': sprintf(num,"$%04X",b); break;
case 'D': sprintf(num,"%02Xh",d); break;
case 'K': sprintf(num,"%d",k); break;
case 'N': sprintf(num,"%s",nextar[n]); break;
case 'M': sprintf(num,"%s",arith[m]); break;
case 'P': sprintf(num,"PA%d",p); break;
case 'R': sprintf(num,"AR%d",r); break;
case 'S': sprintf(num,",%d",s); break;
case 'W': sprintf(num,"%04Xh",w); break;
default:
printf("illegal escape character in format '%s'\n",Op[op].fmt);
exit(1);
}
q = num; while (*q) *str++ = *q++;
*str = '\0';
}
else
{
*str++ = *cp++;
*str = '\0';
}
}
return cnt;
}