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debugger.c
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debugger.c
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/*
Copyright (C) 1997-2008 ZSNES Team ( zsKnight, _Demo_, pagefault, Nach )
http://www.zsnes.com
http://sourceforge.net/projects/zsnes
https://zsnes.bountysource.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.
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 <ctype.h>
#include <string.h>
#ifndef NCURSES
#include <curses.h>
#else
#include <ncurses.h>
#endif
#include "zpath.h"
#ifdef __MSDOS__
#include <dpmi.h>
#endif // __MSDOS__
#include "c_vcache.h"
#include "cpu/c_execute.h"
#include "cpu/memory.h"
#include "cpu/memtable.h"
#include "cpu/regs.h"
#include "cpu/spc700.h"
#include "debugasm.h"
#include "endmem.h"
#include "init.h"
#include "initc.h"
#include "zstate.h"
// All of these should be in headers, people!
extern unsigned char oamram[1024], DSPMem[256];
extern unsigned char CurrentCPU;
extern unsigned char soundon;
extern unsigned int cycpbl;
extern unsigned short xa, xx, xy, xs;
extern unsigned char xdb;
extern unsigned char debuggeron;
// should be in "zstate.h"
void debugloadstate();
char* ocname;
unsigned char addrmode[];
char* spcnametab[];
char* AddressTable[];
unsigned char ArgumentTable[];
unsigned char debugds = 0; // debug disable (bit 0 = 65816, bit 1 = SPC)
unsigned int numinst = 0;
unsigned char wx = 0, wy = 0, wx2 = 0, wy2 = 0;
unsigned char execut = 0;
unsigned char debstop = 0, debstop2 = 0, debstop3 = 0, debstop4 = 0;
char debugsa1 = 0;
char skipdebugsa1 = 1;
#define CP(n) (A_BOLD | COLOR_PAIR(n))
enum color_pair {
cp_white = 1,
cp_magenta,
cp_red,
cp_cyan,
cp_green,
cp_yellow,
cp_white_on_blue,
};
WINDOW* debugwin;
// can't get this to work right...
//#define CHECK (COLOR_PAIR(cp_white) | A_DIM | ACS_CKBOARD)
#define CHECK (CP(cp_white) | ' ')
void debugloop();
void startdisplay();
void nextopcode();
void cleardisplay();
void nextspcopcode();
void SaveOAMRamLog();
void debugdump();
void out65816();
void traceops(unsigned count);
void SPCbreakops(unsigned short addr);
unsigned char* findop();
unsigned char* findoppage();
void startdebugger(void)
{
static int firsttime = 1;
#ifdef __MSDOS__
__dpmi_regs regs;
regs.x.ax = 0x0003;
__dpmi_int(0x10, ®s);
#endif // __MSDOS__
curblank = 0x40;
debuggeron = 1;
if (firsttime) {
initscr();
cbreak();
noecho();
intrflush(stdscr, FALSE);
keypad(stdscr, TRUE);
/* set up colors */
start_color();
init_pair(cp_white, COLOR_WHITE, COLOR_BLACK);
init_pair(cp_magenta, COLOR_MAGENTA, COLOR_BLACK);
init_pair(cp_red, COLOR_RED, COLOR_BLACK);
init_pair(cp_cyan, COLOR_CYAN, COLOR_BLACK);
init_pair(cp_green, COLOR_GREEN, COLOR_BLACK);
init_pair(cp_yellow, COLOR_YELLOW, COLOR_BLACK);
init_pair(cp_white_on_blue, COLOR_WHITE, COLOR_BLUE);
}
execut = 0;
if (firsttime) {
startdisplay();
debugwin = newwin(20, 77, 2, 1);
wbkgd(debugwin, CP(cp_white_on_blue) | ' ');
// wattrset(debugwin, CP(cp_white_on_blue));
scrollok(debugwin, TRUE);
idlok(debugwin, TRUE);
firsttime = 0;
} else {
touchwin(stdscr);
touchwin(debugwin);
refresh();
wrefresh(debugwin);
}
debugloop();
cleardisplay();
// "pushad / call LastLog / ... / popad" elided
SaveOAMRamLog();
if (execut == 1) {
start65816();
return;
}
endprog();
return;
}
WINDOW* openwindow(int nlines, int ncols, int begin_y, int begin_x,
char* message)
{
WINDOW* w = newwin(nlines, ncols, begin_y, begin_x);
wbkgd(w, CP(cp_white_on_blue | ' '));
// wattrset(w, CP(cp_white_on_blue));
mvwprintw(w, 1, 1, "%s", message);
wclrtoeol(w);
box(w, 0, 0);
return w;
}
void closewindow(WINDOW* w)
{
delwin(w);
touchwin(debugwin);
wrefresh(debugwin);
}
//*******************************************************
// Debug Loop
//*******************************************************
unsigned short PrevBreakPt_offset;
unsigned char PrevBreakPt_page;
void debugloop()
{
int key;
a:
if (!(debugds & 2))
nextopcode();
if (!(debugds & 1))
nextspcopcode();
b:
// redrawing the display is always a good idea
refresh();
wrefresh(debugwin);
key = getch();
if (key >= 0 && key < 256)
key = toupper(key);
switch (key) {
case KEY_F(1): // run
execut = 1;
return;
case KEY_F(2): // debugsavestate
statesaver();
goto b;
case KEY_F(4): // debugloadstate
debugloadstate();
goto a;
case 27: // exit
return;
case '\n': // step
goto e;
case 'C': // clear
numinst = 0;
goto a;
case 'M': // modify
{
WINDOW* w;
unsigned addr, value, n;
w = openwindow(7, 33, 11, 24, " Enter Address : ");
mvwaddstr(w, 3, 1, " Previous Value: ");
mvwaddstr(w, 5, 1, " Enter Value : ");
wrefresh(w);
echo();
n = mvwscanw(w, 1, 21, "%x", &addr);
noecho();
if (n == 1) {
mvwprintw(w, 3, 21, "%02x", memr8(addr >> 16, addr));
wrefresh(w);
echo();
n = mvwscanw(w, 5, 21, "%x", &value);
noecho();
if (n == 1) {
memw8(addr >> 16, addr, value);
}
}
closewindow(w);
goto b;
}
case 'B': // breakpoint
{
WINDOW* w = openwindow(3, 33, 11, 24, " Enter Address : ");
unsigned addr, n;
wrefresh(w);
echo();
n = wscanw(w, "%x", &addr);
noecho();
closewindow(w);
if (n == 1) {
w = openwindow(3, 52, 11, 14,
" Locating Breakpoint ... Press ESC to stop. ");
wrefresh(w);
nodelay(stdscr, 1);
PrevBreakPt_page = addr >> 16;
PrevBreakPt_offset = addr;
breakops();
nodelay(stdscr, 0);
closewindow(w);
goto a;
}
goto b;
}
case 'R': // repeat breakpoint
breakops();
goto a;
case 'S': // SPC breakpoint
{
WINDOW* w;
unsigned addr, n;
w = openwindow(3, 33, 11, 24, " Enter Address : ");
wrefresh(w);
echo();
n = mvwscanw(w, 1, 22, "%x", &addr);
noecho();
closewindow(w);
if (n == 1) {
SPCbreakops(addr);
goto a;
}
goto b;
}
case 'A': // SPC modify
{
WINDOW* w;
unsigned addr, value, n;
w = openwindow(7, 33, 11, 24, " Enter Address : ");
mvwaddstr(w, 3, 1, " Previous Value: ");
mvwaddstr(w, 5, 1, " Enter Value : ");
wrefresh(w);
echo();
n = mvwscanw(w, 1, 22, "%x", &addr);
noecho();
addr &= 0xFFFF;
if (n == 1) {
mvwprintw(w, 3, 22, "%02x", SPCRAM[addr]);
wrefresh(w);
echo();
n = mvwscanw(w, 5, 22, "%x", &value);
noecho();
if (n == 1) {
SPCRAM[addr] = value;
}
}
closewindow(w);
goto b;
}
case 'T': // trace
{
WINDOW* w;
unsigned n, instrs;
w = openwindow(3, 52, 11, 14, " Enter # of Instructions to Trace : ");
wrefresh(w);
echo();
n = wscanw(w, "%d", &instrs);
noecho();
closewindow(w);
if (n == 1) {
traceops(instrs);
goto a;
}
goto b;
}
case 'D': // debug dump
debugdump();
goto b;
case 'W': // break at signal (breakatsign)
{
WINDOW* w;
w = openwindow(3, 52, 11, 14,
" Waiting for Signal .... Press ESC to stop.");
wrefresh(w);
debstop3 = 0;
nodelay(w, TRUE);
do {
execnextop();
} while ((!((++numinst % 256) && (wgetch(w) == 27)))
&& (debstop3 != 1));
debstop3 = 0;
nodelay(w, FALSE);
closewindow(w);
goto a;
}
case 'L': // break at signal & log (breakatsignlog)
{
FILE* fp;
WINDOW *w, *real_debugwin;
w = openwindow(3, 52, 11, 14,
" Waiting for Signal .... Press ESC to stop.");
wrefresh(w);
// Open output file
fp = fopen_dir(ZStartPath, "debug.log", "w");
real_debugwin = debugwin;
debugwin = newpad(2, 77);
scrollok(debugwin, TRUE);
debstop3 = 0;
nodelay(w, TRUE);
do {
char buf[78];
// log instruction
move(0, 0);
out65816();
mvwinnstr(debugwin, 0, 0, buf, 77);
buf[77] = 0;
fprintf(fp, "%s\n", buf);
fflush(fp);
execnextop();
} while ((!((++numinst % 256) && (wgetch(w) == 27)))
&& (debstop3 != 1));
debstop3 = 0;
nodelay(w, FALSE);
fclose(fp);
delwin(debugwin);
debugwin = real_debugwin;
closewindow(w);
goto a;
}
case '1': // toggle SPC
debugds ^= 1;
break;
case '2': // toggle 65816
debugds ^= 2;
break;
default:
wprintw(debugwin, "Unknown key code: %d\n", key);
goto b;
}
e:
skipdebugsa1 = 0;
execnextop();
skipdebugsa1 = 1;
if (soundon && (debugds & 2) && (cycpbl >= 55))
goto e;
goto a;
}
//*******************************************************
// BreakatSignC Breaks whenever sndwrit = 1
//*******************************************************
unsigned char sndwrit;
/* void breakatsignc() {} */
void traceops(unsigned count)
{
WINDOW* w;
w = openwindow(3, 52, 11, 14, " Tracing. Press ESC to stop.");
wrefresh(w);
nodelay(w, TRUE);
while (count-- && (wgetch(w) != 27)) {
execnextop();
}
closewindow(w);
}
void SPCbreakops(unsigned short addr)
{
WINDOW* w;
unsigned char* breakarea;
breakarea = SPCRAM + addr;
w = openwindow(3, 52, 11, 14, "Locating Breakpoint ... Press ESC to stop.");
wrefresh(w);
nodelay(w, TRUE);
do {
execnextop();
} while ((!((++numinst % 256)
&& (wgetch(w) == 27)))
&& (spcPCRam != breakarea));
nodelay(w, FALSE);
closewindow(w);
}
void printinfo(char* s)
{
while (s[0]) {
if (s[0] == '@') {
int colors[] = {
0, 0, cp_green, cp_cyan,
cp_red, cp_magenta, cp_yellow, cp_white
};
attrset(COLOR_PAIR(colors[s[1] - '0']));
s += 2;
} else {
addch(s[0]);
s += 1;
}
}
}
//*******************************************************
// Start Display
//*******************************************************
void startdisplay()
{
int i;
// Clear the screen
bkgd(CP(cp_white) | ' ');
clear();
// Draw to screen
// ASM for some reason puts the same thing in the upper left corner again?
move(1, 0);
attrset(CP(cp_white_on_blue));
addch(CurrentCPU + '0');
for (i = 15; i; i--)
addch(ACS_HLINE);
printw(" CC: Y: ");
for (i = 19; i; i--)
addch(ACS_HLINE);
addch(' ');
for (i = 11; i; i--)
addch(' ');
addch(' ');
for (i = 16; i; i--)
addch(ACS_HLINE);
addch(ACS_URCORNER);
for (i = 2; i < 22; i++) {
mvaddch(i, 0, ACS_VLINE);
hline(' ', 77);
mvaddch(i, 78, ACS_VLINE);
mvaddch(i, 79, CHECK);
}
mvaddch(22, 0, ACS_LLCORNER);
for (i = 77; i; i--)
addch(ACS_HLINE);
mvaddch(22, 78, ACS_LRCORNER);
mvaddch(22, 79, CHECK);
move(23, 1);
for (i = 79; i; i--)
addch(CHECK);
// Print debugger information
move(0, 2);
attrset(CP(cp_white));
printinfo("- @5Z@4S@3N@2E@6S@7 debugger -");
move(1, 4);
attrset(CP(cp_white_on_blue));
printinfo(" 65816 ");
// HACK ALERT! this should really be on the bottom line, but
// xterms default to being one line shorter than 80x25, so this
// won't be on the bottom line on DOS!
// Also, we are printing on top of the (currently invisible) drop shadow!"
move(23, 0);
printinfo("@4(@6T@4)@7race for @4(@6B@4)@7reakpoint "
"@4(@6Enter@4)@7 Next "
"@4(@6M@4)@7odify @4(@6F9@4)@7 Signal @4(@6F1@4)@7 Run");
// ...
move(0, 0);
refresh();
}
//*******************************************************
// Next Opcode Writes the next opcode & regs
//*******************************************************
// 008000 STZ $123456,x A:0000 X:0000 Y:0000 S:01FF DB:00 D:0000 P:33 E+
/*
void addtail() {
debugt++;
if (debugt == 100)
debugt = 0;
if (debugt == debugh)
debugh++;
if (debugh == 100)
debugh = 0;
}
*/
// I'm going to have to completely rip out byuu's effective address
// stuff, it is just plain *WRONG*, besides being unsafe...
// For next time, http://www.zophar.net/tech/files/65c816.txt seems
// like a good reference for effective address calculation; also, use
// 24-bit addresses for all calculations (so completely rip out
// memr8, too). Also, preferably read memory in a
// non-destructive way.
// This whole instr[1] thing probably isn't quite right either, but it
// seems unlikely that instructions would be stored discontiguously
// than that data would span 64kb boundaries.
void out65816_addrmode(unsigned char* instr)
{
char* padding = "";
#define GETXB() ((ocname[4 * instr[0]] != 'J') ? xdb : xpb)
#define INDEX_RIGHT(addr, index) \
((xp & 0x10) \
? (((addr) & ~0xff) | (((addr) + (index)) & 0xff)) \
: (((addr) & ~0xffff) | (((addr) + (index)) & 0xffff)))
// each mode must output 19 characters
switch (addrmode[instr[0]]) {
case 0:
case 6:
case 21:
// nothing to show
wprintw(debugwin, "%19s", padding);
break;
case 1: // #$12,#$1234 (M-flag)
wprintw(debugwin, "#$");
if (xp & 0x20) {
wprintw(debugwin, "%02x", instr[1]);
wprintw(debugwin, "%15s", padding);
} else {
wprintw(debugwin, "%04x", *(unsigned short*)(instr + 1));
wprintw(debugwin, "%13s", padding);
}
break;
case 2: // $1234 : db+$1234
wprintw(debugwin, "$%04x", *(unsigned short*)(instr + 1));
wprintw(debugwin, "%5s[%02x%04x] ", padding, GETXB(),
*(unsigned short*)(instr + 1));
break;
case 3: // $123456
wprintw(debugwin, "$%02x%04x", instr[3], *(unsigned short*)(instr + 1));
wprintw(debugwin, "%12s", padding);
break;
case 4: // $12 : $12+d
wprintw(debugwin, "$%02x%7s[%02x%04x] ", instr[1], padding, 0,
instr[1] + xd);
break;
case 5: // A
wprintw(debugwin, "A%18s", padding);
break;
case 7: // ($12),y
{
wprintw(debugwin, "($%02x),Y ", instr[1]);
wprintw(debugwin, "[nnnnnn] ");
break;
}
case 8: // [$12],y
{
unsigned short addr;
unsigned int t;
wprintw(debugwin, "[$%02x],Y ", instr[1]);
addr = instr[1] + xd;
t = memr8(0, addr);
t |= memr8(0, addr + 1) << 8;
t |= memr8(0, addr + 2) << 16;
t = INDEX_RIGHT(t, xy);
wprintw(debugwin, "[%06x] ", t);
break;
}
case 9: // ($12,x)
{
wprintw(debugwin, "($%02x,X) ", instr[1]);
wprintw(debugwin, "[nnnnnn] ");
break;
}
case 10: // $12,x : $12+d+x
{
wprintw(debugwin, "$%02x,X%5s", instr[1], padding);
wprintw(debugwin, "[%06x] ", INDEX_RIGHT(instr[1] + xd, xx));
break;
}
case 11: // $12,y
{
wprintw(debugwin, "$%02x,Y%5s", instr[1], padding);
wprintw(debugwin, "[%06x] ", INDEX_RIGHT(instr[1] + xd, xy));
break;
}
case 12: // $1234,x : dbr+$1234+x
{
unsigned int t = instr[1] | (instr[2] << 8);
wprintw(debugwin, "$%04x,X ", t);
t = INDEX_RIGHT(t, xx);
wprintw(debugwin, "[%02x%04x] ", xdb, t);
break;
}
case 13: // $1234,y : dbr+$1234+y
{
unsigned int t = instr[1] | (instr[2] << 8);
wprintw(debugwin, "$%04x,Y ", t);
t = INDEX_RIGHT(t, xy);
wprintw(debugwin, "[%02x%04x] ", xdb, t);
break;
}
case 14: // $123456,x : $123456+x
{
unsigned int t = instr[1] | (instr[2] << 8) | (instr[3] << 16);
wprintw(debugwin, "$%06x,X ", t);
t = INDEX_RIGHT(t, xx);
wprintw(debugwin, "[%06x] ", t);
break;
}
case 15: // +-$12 / $1234
{
signed char c = instr[1];
unsigned short t = c + xpc + 2;
wprintw(debugwin, "$%04x%4s [%02x%04x] ", t, padding, xpb, t);
break;
}
case 16: // +-$1234 / $1234
{
unsigned short s = instr[1] | (instr[2] << 8);
unsigned short t = s + xpc + 3;
wprintw(debugwin, "$%04x%4s [%02x%04x] ", t, padding, xpb, t);
break;
}
case 17: // ($1234)
{
wprintw(debugwin, "($%04x) ", instr[1]);
wprintw(debugwin, "[nnnnnn] ");
break;
}
case 18: // ($12)
{
unsigned short addr1, addr2;
wprintw(debugwin, "($%02x)%5s", instr[1], padding);
addr1 = instr[1] + xd;
addr2 = memr8(00, addr1);
addr2 |= memr8(00, addr1 + 1) << 8;
wprintw(debugwin, "[%02x%04x] ", xdb, addr2);
break;
}
case 19: // [$12]
{
wprintw(debugwin, "[$%02x]%5s", instr[1], padding);
wprintw(debugwin, "[nnnnnn] ");
break;
}
case 20: // ($1234,x)
{
unsigned short cx = *(unsigned short*)(instr + 1);
unsigned short x;
wprintw(debugwin, "($%04x,X) [%02x", cx, xpb);
if (xp & 0x10)
cx = (cx & 0xFF00) | ((cx + xx) & 0xFF);
else
cx += xx;
// .out20n
x = memr8(xpb, cx);
x += memr8(xpb, cx + 1) << 8;
wprintw(debugwin, "%04x] ", x);
break;
}
case 22: // d,s
wprintw(debugwin, "$%02x,S%5s", instr[1], padding);
wprintw(debugwin, "[nnnnnn] ");
break;
case 23: // (d,s),y
wprintw(debugwin, "($%02x,S),Y ", instr[1]);
wprintw(debugwin, "[nnnnnn] ");
break;
case 24: // xyc - $1234
wprintw(debugwin, "$%02x%02x%14s", instr[2], instr[1], padding);
break;
case 25: // #$12 (Flag Operations)
wprintw(debugwin, "#$%02x%15s", instr[1], padding);
break;
case 26: // #$12,#$1234 (X-flag)
if (xp & 0x10) {
wprintw(debugwin, "#$%02x%15s", instr[1], padding);
} else {
wprintw(debugwin, "#$%04x%13s",
*(unsigned short*)(instr + 1), padding);
}
break;
case 27: // [$1234]
wprintw(debugwin, "[$%02x%02x] ", instr[2], instr[1]);
break;
default:
wprintw(debugwin, "%15s %02d ", "bad addr mode", addrmode[instr[0]]);
}
}
unsigned char* findoppage()
{
if (xpc & 0x8000) {
return snesmmap[xpb];
} else {
// lower address
if ((xpc < 0x4300) || (memtabler8[xpb] != regaccessbankr8)) {
// lower memory
return snesmap2[xpb];
} else {
// dma
return (u1*)dmadata - 0x4300; // XXX ugly cast
}
}
}
unsigned char* findop()
{
unsigned char* address = findoppage() + xpc;
return address;
}
// print out a 65816 instruction
void out65816()
{
unsigned char *address, opcode;
char opname[5] = "FOO ";
wprintw(debugwin, "%02x%04x ", xpb, xpc);
// is this safe?
address = findop();
opcode = *address;
memcpy(opname, &ocname[opcode * 4], 4);
wprintw(debugwin, "%s", opname);
out65816_addrmode(address);
wprintw(debugwin, "A:%04x X:%04x Y:%04x S:%04x DB:%02x D:%04x P:%02x %c",
xa, xx, xy, xs, xdb, xd, xp, (xe == 1) ? 'E' : 'e');
}
void outsa1()
{
// stub!
}
void nextopcode()
{
attrset(CP(cp_white_on_blue));
move(1, 50);
printw("%11d", numinst);
move(1, 20);
printw("%3d", curcyc);
move(1, 26);
printw("%3d", curypos);
// I don't understand the buffering scheme here... I'm just going
// to hope it isn't really all that important.
// if (debugsa1 != 1)
out65816();
// else
// outputbuffersa1();
}
void cleardisplay()
{
move(0, 0); /* clear(); refresh(); */
endwin();
}
//*******************************************************
// Next SPC Opcode Writes the next opcode & regs
//*******************************************************
// 008000 STZ $123456,x A:0000 X:0000 Y:0000 S:01FF DB:00 D:0000 P:33 E+
void outspc_addrmode()
{
unsigned char mode;
char* format;
char buf[16] = " ";
char* p;
#define HEX8(val) \
do { \
p += sprintf(p, "%02x", val); \
*p = ' '; \
} while (0)
#define HEX16(val) \
do { \
p += sprintf(p, "%04x", val); \
*p = ' '; \
} while (0)
mode = ArgumentTable[spcPCRam[0]];
format = AddressTable[mode];
// memset(buf, ' ', 15); buf[15] = 0;
p = buf;
while (*format) {
if (*format != '%') {
*p++ = *format++;
continue;
}
format++;
switch (*format++) {
case '1': // first byte
HEX8(spcPCRam[1]);
break;
case '2': // second byte
HEX8(spcPCRam[2]);
break;
case '3': // hinib
*p++ = (spcPCRam[0] >> 4) + '0';