Category : OS/2 Files
Archive : EMXTST8F.ZIP
Filename : DEBUG.C
Output of file : DEBUG.C contained in archive : EMXTST8F.ZIP
/* Test ptrace() */
#include
#include
#include
#include
#include
#include
#include
#include
typedef unsigned char byte;
struct reg
{
char *name;
int regno;
unsigned value;
};
struct breakpoint
{
struct breakpoint *next;
unsigned addr;
byte save;
};
#define N_EIP 8
static struct reg regs[] =
{
{"eax", EAX},
{"ebx", EBX},
{"ecx", ECX},
{"edx", EDX},
{"esi", ESI},
{"edi", EDI},
{"esp", UESP},
{"ebp", EBP},
{"eip", EIP},
{NULL, 0}
};
static int pid;
static int silent;
static int auto_switch;
static int uaddr;
static long dump_addr;
static struct breakpoint *breakpoints = NULL;
static void show_regs (void)
{
int i, j, r;
j = 4;
for (i = 0; regs[i].name != NULL; ++i)
{
errno = 0;
r = ptrace (PTRACE_PEEKUSER, pid, uaddr + regs[i].regno * 4, 0);
if (errno != 0) perror ("ptrace");
regs[i].value = r;
if (j == 4)
{
j = 0; putchar ('\n');
}
++j;
printf ("%s=%.8x ", regs[i].name, r);
}
errno = 0;
r = ptrace (PTRACE_PEEKTEXT, pid, regs[N_EIP].value, 0);
if (errno == 0)
for (i = 0; i < 4; ++i)
{
printf ("%.2x ", r & 0xff);
r >>= 8;
}
putchar ('\n');
}
static void insert_bp (struct breakpoint *bp, int eip)
{
int r;
if (bp->addr != eip)
{
errno = 0;
r = ptrace (PTRACE_PEEKTEXT, pid, bp->addr, 0);
if (errno != 0)
return;
bp->save = (byte)r;
r = (r & ~0xff) | 0xcc;
ptrace (PTRACE_POKETEXT, pid, bp->addr, r);
}
}
static void remove_bp (struct breakpoint *bp)
{
int r;
errno = 0;
r = ptrace (PTRACE_PEEKTEXT, pid, bp->addr, 0);
if (errno != 0)
return;
r = (r & ~0xff) | bp->save;
ptrace (PTRACE_POKETEXT, pid, bp->addr, r);
}
static void insert_breakpoints (struct breakpoint *bp)
{
int r;
errno = 0;
r = ptrace (PTRACE_PEEKUSER, pid, uaddr + EIP * 4, 0);
if (errno != 0) perror ("ptrace");
while (bp != NULL)
{
insert_bp (bp, r);
bp = bp->next;
}
}
static void remove_breakpoints (struct breakpoint *bp)
{
if (bp != NULL)
{
remove_breakpoints (bp->next);
remove_bp (bp);
}
}
static void run (int cmd)
{
int s, t, p, r, e;
struct breakpoint *bp;
insert_breakpoints (breakpoints);
if (auto_switch)
ptrace (PTRACE_SESSION, pid, 0, 2);
s = ptrace (cmd, pid, 0, 0);
e = errno;
if (auto_switch)
ptrace (PTRACE_SESSION, pid, 0, 0);
remove_breakpoints (breakpoints);
errno = e;
if (s < 0)
perror ("ptrace");
else
{
p = wait (&t);
if (p == -1)
perror ("wait");
if (!silent)
printf ("wait: %.4x\n", t);
if ((t & 0377) != 0177)
{
printf ("Program terminated (%d)\n", (t >> 8) & 0xff);
exit (0);
}
errno = 0;
r = ptrace (PTRACE_PEEKUSER, pid, uaddr + EIP * 4, 0);
if (errno != 0) perror ("ptrace");
--r;
for (bp = breakpoints; bp != NULL; bp = bp->next)
if (bp->addr == r)
break;
if (bp != NULL)
ptrace (PTRACE_POKEUSER, pid, uaddr + EIP * 4, r);
}
}
static void dump (char *buf)
{
int i, j, r;
long n;
char *p;
if (*buf != 0)
{
errno = 0;
n = strtol (buf, &p, 16);
if (errno != 0 || *p != 0)
{
printf ("Error!\n");
return;
}
dump_addr = n;
}
for (i = 0; i < 8; ++i)
{
printf ("%.8lx: ", dump_addr);
for (j = 0; j < 8; ++j)
{
errno = 0;
r = ptrace (PTRACE_PEEKTEXT, pid, dump_addr, 0);
if (errno != 0)
fputs ("?? ?? ", stdout);
else
printf ("%.2x %.2x ", r & 0xff, (r >> 8) & 0xff);
dump_addr += 2;
}
putchar ('\n');
}
}
static void set_bp (char *buf)
{
int i;
long addr;
struct breakpoint *bp, **abp;
char *p;
if (*buf == 0)
{
for (i = 1, bp = breakpoints; bp != NULL; bp = bp->next)
printf ("Breakpoint %d at %.8lx\n", i, bp->addr);
}
else
{
errno = 0;
addr = strtol (buf, &p, 16);
if (errno != 0 || *p != 0)
{
printf ("Error!\n");
return;
}
bp = malloc (sizeof (struct breakpoint));
if (bp == NULL)
{
printf ("Out of memory\n");
return;
}
bp->next = NULL;
bp->addr = addr;
for (abp = &breakpoints; *abp != NULL; abp = &(*abp)->next)
;
*abp = bp;
}
}
static void start (const char *prog, const char * const *args,
const char * const *envp)
{
struct user u;
pid = spawnve (P_DEBUG | P_WINDOWED, prog, args, envp);
if (pid < 0)
{
perror ("spawnve");
exit (2);
}
printf ("pid=%d\n", pid);
errno = 0;
uaddr = ptrace (PTRACE_PEEKUSER, pid, (char *)&u.u_ar0 - (char *)&u, 0);
if (errno != 0) perror ("ptrace");
uaddr -= 0xe0000000;
}
static void command_loop (void)
{
char buf[10], *p;
for (;;)
{
if (fgets (buf, sizeof (buf), stdin) == NULL)
break;
p = strchr (buf, '\n');
if (p != NULL) *p = 0;
if (buf[0] == 'q')
break;
else if (buf[0] == 'd')
dump (buf+1);
else if (buf[0] == 'b')
set_bp (buf+1);
else if (buf[0] == 'g')
{
run (PTRACE_RESUME);
show_regs ();
}
else if (buf[0] == 0)
{
run (PTRACE_STEP);
show_regs ();
}
else
{
puts ("q quit");
puts ("d ADDR dump");
puts ("g resume");
puts ("b ADDR set breakpoint");
puts ("(empty) step");
}
}
}
int main (int argc, char **argv, char **envp)
{
int i;
i = 1; silent = 0; auto_switch = 0;
while (i < argc)
{
if (strcmp (argv[i], "-s") == 0)
{
silent = 1; ++i;
}
else if (strcmp (argv[i], "-a") == 0)
{
auto_switch = 1; ++i;
}
else
break;
}
if (i+1 > argc)
{
fputs ("usage: emx debug [-a] [-s] prog [args]\n", stderr);
exit (1);
}
start (argv[i], (const char * const *)(argv+i), (const char * const *)envp);
if (silent)
for (;;)
run (PTRACE_STEP);
else
command_loop ();
return (0);
}
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This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.
But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/