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dis6502/main.c

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/*
* dis6502 by Robert Bond, Udi Finkelstein, and Eric Smith
*
* $Id: main.c 26 2004-01-17 23:28:23Z eric $
* Copyright 2000-2016 Eric Smith <eric@brouhaha.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. Note that permission is
* not granted to redistribute this program under the terms of any
* other version of the General Public License.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111 USA
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "dis.h"
int sevenbit = 0; /* if true, mask character data with 0x7f to ignore MSB */
#define NTSTART 500
char *cur_file = NULL; /* the file thats open */
int pre_index = 0;
int tstart[NTSTART]; /* .trace directive keep locations */
int tstarti = 0;
#define RTSTAB_MAX 50
int rtstab_addr [RTSTAB_MAX]; /* .rtstab directive */
int rtstab_size [RTSTAB_MAX];
int rtstab_count = 0;
#define JTAB2_MAX 50
int jtab2_addr_low [JTAB2_MAX]; /* .jtab2 directive */
int jtab2_addr_high [JTAB2_MAX]; /* .jtab2 directive */
int jtab2_size [JTAB2_MAX];
int jtab2_count = 0;
VALUE token;
unsigned char d[0x10000]; /* The data */
unsigned char f[0x10000]; /* Flags for memory usage */
long offset [0x10000]; /* label offset */
#define RUNLOC 0x2e0
#define INITLOC 0x2e2
void crash (char *p)
{
fprintf(stderr, "%s: %s\n", progname, p);
if (cur_file != NULL)
fprintf(stderr, "Line %d of %s\n", lineno+1, cur_file);
exit(1);
}
void add_trace (addr_t addr)
{
if (f [addr] & TDONE)
return;
push_trace_queue (addr);
}
void trace_inst (addr_t addr)
{
int opcode;
register struct info *ip;
int operand;
int istart;
for (;;)
{
if (f[addr] & TDONE)
return;
f[addr] |= TDONE;
istart = addr;
opcode = getbyte(addr);
ip = &optbl[opcode];
if (! (ip->flag & ADRMASK)) // illegal if no address mode
return;
f[addr] |= ISOP;
addr++;
/* Get the operand */
switch(ip->nb)
{
case 1:
operand = 0; /* only to avoid "may be used unitialized" warning */
break;
case 2:
operand = getbyte(addr);
f[addr++] |= TDONE;
break;
case 3:
operand = getword(addr);
f[addr++] |= TDONE;
f[addr++] |= TDONE;
break;
}
/* Mark data references */
switch (ip->flag & ADRMASK)
{
case IMM:
case ACC:
case IMP:
case REL:
case IND:
case INZ:
break;
case ABS:
if (ip->flag & (JUMP | FORK))
break;
/* Fall into */
case ABX:
case ABY:
case INX:
case INY:
case ZPG:
case ZPX:
case ZPY:
f[operand] |= DREF;
save_ref(istart, operand);
break;
default:
crash("Optable error");
break;
}
/* Trace the next instruction */
switch (ip->flag & CTLMASK)
{
case JUMP:
if (ip->flag & REL)
{
if (operand > 127)
operand = (~0xff | operand);
operand = operand + addr;
}
f[operand] |= JREF;
save_ref(istart, operand);
add_trace(operand);
return;
case FORK:
if (ip->flag & REL)
{
if (operand > 127)
operand = (~0xff | operand);
operand = operand + addr;
f[operand] |= JREF;
}
else
{
f[operand] |= SREF;
}
save_ref(istart, operand);
add_trace(operand);
break;
case STOP:
return;
default:
break;
}
}
}
void trace_all (void)
{
while (! trace_queue_empty ())
trace_inst (pop_trace_queue ());
}
void start_trace (addr_t loc, char *name)
{
fprintf(stderr, "Trace: %4x %s\n", loc, name);
f[loc] |= (NAMED | SREF);
if (!get_name(loc))
save_name(loc, name);
save_ref(0, loc);
add_trace(loc);
}
void do_ptrace (void)
{
int i;
for (i = 0; i<tstarti; i++)
{
char *trace_sym = (char *) malloc (6);
sprintf (trace_sym, "P%04x", tstart [i]);
start_trace(tstart[i], trace_sym);
}
}
void do_rtstab (void)
{
int i, j;
int loc, code;
for (i = 0; i < rtstab_count; i++)
{
loc = rtstab_addr [i];
for (j = 0; j < rtstab_size [i]; j++)
{
char *trace_sym = (char *) malloc (6);
code = d [loc] + (d [loc + 1] << 8) + 1;
sprintf (trace_sym, "T%04x", code);
start_trace (code, trace_sym);
loc += 2;
}
}
}
void do_jtab2 (void)
{
int i, j;
int loc_l, loc_h, code;
for (i = 0; i < jtab2_count; i++)
{
loc_l = jtab2_addr_low [i];
loc_h = jtab2_addr_high [i];
for (j = 0; j < jtab2_size [i]; j++)
{
char *trace_sym = (char *) malloc (6);
code = d [loc_l + j] + (d [loc_h + j] << 8);
sprintf (trace_sym, "T%04x", code);
start_trace (code, trace_sym);
}
}
}
int main (int argc, char *argv[])
{
initopts(argc, argv);
init_trace_queue ();
if (npredef > 0) {
cur_file = predef[0];
pre_index++;
yyin = fopen(cur_file, "r");
if (!yyin)
crash ("Cant open predefine file");
get_predef();
}
switch (bopt)
{
case RAW_BINARY:
binaryloadfile();
break;
case ATARI_LOAD:
loadfile();
break;
case C64_LOAD:
c64loadfile();
break;
case ATARI_BOOT:
loadboot();
break;
default:
crash ("file format must be specified");
}
do_ptrace ();
do_rtstab ();
do_jtab2 ();
trace_all ();
dumpitout();
exit(0);
}
void get_predef (void)
{
long loc, loc2;
int i;
int size;
char *name;
for(;;)
switch (yylex()) {
case '\n':
break;
case COMMENT:
break;
case 0:
return;
case TRTSTAB:
if (yylex() != NUMBER)
crash(".rtstab needs an address operand");
loc = token.ival;
if (loc > 0x10000 || loc < 0)
crash("Number out of range");
if (yylex() != ',')
crash(".rtstab needs a comma");
if (yylex() != NUMBER)
crash(".rtstab needs a comma");
size = token.ival;
rtstab_addr [rtstab_count] = loc;
rtstab_size [rtstab_count++] = size;
break;
case TJTAB2:
if (yylex() != NUMBER)
crash(".jtab2 needs a number operand");
if (token.ival > 0x10000 || token.ival < 0)
crash("Number out of range");
jtab2_addr_low [jtab2_count] = token.ival;
if (yylex() != ',')
crash(".jtab2 needs a comma");
if (yylex() != NUMBER)
crash(".jtab2 needs a number operand");
if (token.ival > 0x10000 || token.ival < 0)
crash("Number out of range");
jtab2_addr_high [jtab2_count] = token.ival;
if (yylex() != ',')
crash(".jtab2 needs a comma");
if (yylex() != NUMBER)
crash(".jtab2 needs a number operand");
jtab2_size [jtab2_count++] = token.ival;
break;
case TSTART:
if (yylex() != NUMBER)
crash(".trace needs a number operand");
loc = token.ival;
if (loc > 0x10000 || loc < 0)
crash("Number out of range");
if (tstarti == NTSTART)
crash("Too many .trace directives");
tstart[tstarti++] = loc;
while (yylex() != '\n')
;
break;
case TSTOP:
if (yylex() != NUMBER)
crash(".stop needs a number operand");
loc = token.ival;
if (loc > 0x10000 || loc < 0)
crash("Number out of range");
f[loc] |= TDONE;
while (yylex() != '\n')
;
break;
case NAME:
name = token.sval;
switch (yylex ())
{
case EQ:
if (yylex() != NUMBER)
crash("EQ operand must be a number");
loc = token.ival;
if (loc > 0x10000 || loc < 0)
crash("Number out of range");
f[loc] |= NAMED;
save_name(loc, name);
break;
case EQS:
if (yylex() != NUMBER)
crash("EQS operand must be a number");
loc = token.ival;
if (loc > 0x10000 || loc < 0)
crash("Number out of range");
if (yylex() != ',')
crash(".eqs needs a comma");
if (yylex() != NUMBER)
crash("EQS operand must be a number");
size = token.ival;
f[loc] |= NAMED;
save_name(loc, name);
for (i = 1; i < size; i++)
{
f [loc + i] |= OFFSET;
offset [loc + i] = -i;
}
break;
default:
crash("name can only be used with equate in defines file");
break;
}
while (yylex() != '\n')
;
break;
case OFS:
if (yylex() != NUMBER)
crash("EQ operand must be a number");
loc = token.ival;
if (loc > 0x10000 || loc < 0)
crash("Number out of range");
if (yylex() != ',')
crash(".ofs needs a comma");
if (yylex() != NUMBER)
crash("EQ operand must be a number");
loc2 = token.ival;
if (loc2 > 0x10000 || loc2 < 0)
crash("Number out of range");
/*$$$*/
f[loc] |= OFFSET;
offset[loc] = loc2 - loc;
break;
default:
crash("Invalid line in predef file");
}
}
void loadboot (void)
{
struct boot_hdr {
unsigned char flags;
unsigned char nsec;
unsigned char base_low;
unsigned char base_hi;
unsigned char init_low;
unsigned char init_hi;
} bh;
FILE *fp;
int base_addr;
register int i;
int len;
fp = fopen(file, "r");
cur_file = NULL;
if (!fp) {
fprintf(stderr, "Cant open %s\n", file);
exit(1);
}
if(fread((char *)&bh, sizeof(bh), 1, fp) != 1)
crash("Input too short");
base_addr = bh.base_low + (bh.base_hi << 8);
len = bh.nsec * 128;
rewind(fp);
if (fread((char *)&d[base_addr], 1, len, fp) != len)
crash("input too short");
for(i = base_addr; len > 0; len--)
f[i++] |= LOADED;
start_trace(base_addr+6, "**BOOT**");
}
void loadfile (void)
{
FILE *fp;
int base_addr;
int last_addr;
register int i;
int had_header;
int tmp;
had_header = 0;
fp = fopen(file, "r");
cur_file = NULL;
if (!fp) {
fprintf(stderr, "Cant open %s\n", file);
exit(1);
}
for(;;) {
i = getc(fp);
if (i == EOF) {
if (f[RUNLOC] & LOADED & f[RUNLOC+1]) {
i = getword(RUNLOC);
start_trace(i, "**RUN**");
}
return;
}
i = i | (getc(fp) << 8);
if (i == 0xffff) {
had_header = 1;
base_addr = getc(fp);
base_addr = base_addr | (getc(fp) << 8);
if (base_addr < 0 || base_addr > 0xffff)
crash("Invalid base addr in input file");
} else {
if (!had_header)
crash("Invalid header in input file");
base_addr = i;
}
last_addr = getc(fp);
last_addr = last_addr | (getc(fp) << 8);
if (last_addr < base_addr || last_addr > 0xffff)
crash("Invalid length in input file");
printf("Load: %4x -> %4x\n", base_addr, last_addr);
for(i = base_addr; i <= last_addr; i++) {
tmp = getc(fp);
if (tmp == EOF)
crash("File too small");
d[i] = tmp;
f[i] |= LOADED;
}
if (f[INITLOC] & LOADED & f[INITLOC+1]) {
i = getword(INITLOC);
start_trace(i, "**INIT**");
}
f[INITLOC] &= ~LOADED;
f[INITLOC+1] &= ~LOADED;
}
}
void c64loadfile (void)
{
FILE *fp;
addr_t base_addr,i;
int c;
fp = fopen(file, "r");
cur_file = NULL;
if (!fp) {
fprintf(stderr, "Cant open %s\n", file);
exit(1);
}
base_addr = getc(fp);
i = ( base_addr += ( (unsigned int)getc(fp) << 8 ) );
while( (c = getc(fp)) != EOF) {
d[i] = c;
f[i++] |= LOADED;
}
start_trace(base_addr, "**C64BIN**");
}
void binaryloadfile (void)
{
FILE *fp;
addr_t i;
int c;
addr_t reset, irq, nmi;
fp = fopen (file, "r");
cur_file = NULL;
if (!fp)
{
fprintf (stderr, "Can't open %s\n", file);
exit (1);
}
i = base_address;
while ((c = getc(fp)) != EOF)
{
d [i] = c;
f [i++] |= LOADED;
}
reset = vector_address - 4;
irq = vector_address - 2;
nmi = vector_address - 6;
fprintf (stderr, "base: %04x reset: %04x irq: %04x nmi: %04x\n", base_address, reset, irq, nmi);
if (entry_count)
{
int i;
char label [8];
for (i = 0; i < entry_count; i++)
{
snprintf (label, sizeof (label), "e_%04x", entry_address[i]);
printf("label: %s\n", label);
start_trace (entry_address[i], label);
}
}
else
{
start_trace ((d [reset+1] << 8) | d [reset], "RESET");
start_trace ((d [irq +1] << 8) | d [irq ], "IRQ");
start_trace ((d [nmi +1] << 8) | d [nmi ], "NMI");
}
}
int
yywrap()
{
(void)fclose(yyin);
if (npredef == pre_index) {
return(1);
} else {
lineno = 0;
cur_file = predef[pre_index];
pre_index++;
yyin = fopen(cur_file, "r");
if (!yyin)
crash("Can't open predefines file");
return (0);
}
}
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