Category : OS/2 Files
Archive   : EMXTST8F.ZIP
Filename : DEBUG.C
/* 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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