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/*
* little utility to turn tracing on and off for certain calls
* Copyright (C) 1993 Joe Portman (baron@hebron.connected.com)
*
* Rewritten for latest iBCS emulator. Not so little now and still
* to grow...
* Copyright (C) 1994 Mike Jagdis (jaggy@purplet.demon.co.uk)
*
* $Id: trace.c,v 1.10 1996/07/26 12:03:30 mike Exp $
* $Source: /usr/CVS/ibcs/Tools/trace.c,v $
*/
#include <linux/personality.h>
#include <linux/unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <ibcs/traceapi.h>
_syscall1(int, personality, int, pers);
#ifdef __sparc__
static int
set_trace (int val)
{
int res;
__asm__ volatile ("mov %1,%%o0\n\t"
"mov 193,%%g1\n\t"
"t 8\n\t"
"mov %%o0,%0" : "=r" (res) : "r" (val) : "o0", "g1");
return res;
}
static int
trace_func_set(int per, int call, int val)
{
int res;
__asm__ volatile ("mov %1,%%o0\n\t"
"mov %2,%%o1\n\t"
"mov %3,%%o2\n\t"
"mov 194,%%g1\n\t"
"t 8\n\t"
"mov %%o0,%0"
: "=r" (res)
: "r" (per), "r" (call), "r" (val)
: "o0", "o1", "o2", "g1");
return res;
}
#else /* __sparc__ */
static int
set_trace(int val)
{
int res;
__asm__ volatile ("mov\t$0x00FF,%%eax\n\t"
".byte\t0x9a,0,0,0,0,7,0\n\t"
: "=a" (res));
return res;
}
static int
trace_func_set(int per, int call, int val)
{
int res;
__asm__ volatile ("mov\t$0x01FF,%%eax\n\t"
".byte\t0x9a,0,0,0,0,7,0\n\t"
: "=a" (res));
return res;
}
#endif /* __sparc__ */
struct t_code {
char *name;
int code;
};
struct t_code codes[] = {
{ "all", 0x0ffffeff },
{ "everything", 0x0ffffeff },
{ "api", TRACE_API },
{ "ioctl", TRACE_IOCTL },
{ "failed-ioctl", TRACE_IOCTL_F },
{ "signal", TRACE_SIGNAL },
{ "failed-signal", TRACE_SIGNAL_F },
{ "socksys", TRACE_SOCKSYS },
{ "spx", TRACE_SOCKSYS },
{ "sockets", TRACE_SOCKSYS },
{ "coff", TRACE_COFF_LD },
{ "elf", TRACE_ELF_LD },
{ "xout", TRACE_XOUT_LD },
{ "xout-block", TRACE_XOUT_DB },
{ "streams", TRACE_STREAMS },
{ "STREAMS", TRACE_STREAMS }
};
static int
get_code(char *s)
{
int i;
for (i=0; i<sizeof(codes)/sizeof(codes[0]); i++)
if (!strcmp(s, codes[i].name))
return codes[i].code;
fprintf(stderr, "%s not recognised - ignored\n", s);
return 0;
}
static void
usage(void)
{
int i;
fprintf(stderr,
"usage: trace n - set trace code to n\n"
" or p,n - query tracing for syscall n under personality p\n"
" or p,n,[0|1] - set/clear tracing for syscall n under personality p\n"
" or [+|-]code - where code could be:\n"
" query\n"
" off\n");
for (i=0; i<sizeof(codes)/sizeof(codes[0]); i++)
fprintf(stderr, " %s\n", codes[i].name);
fprintf(stderr, "\n"
"WARNING: This is a debugging tool *only*. It is not robust.\n"
" Passing bad values can cause iBCS/kernel crashes!\n");
}
int
main(int argc, char *argv[])
{
int old_trace_val, trace_val, i;
if (argc == 1) {
usage();
exit(1);
}
/* We need to be in a non-native personality to get access to
* the emulator's trace facilities.
*/
personality(PER_SVR3);
old_trace_val = trace_val = set_trace(-1);
for (i=1; i<argc; i++) {
if (!strcmp(argv[i], "query")) {
printf("iBCS trace code is 0x%lx\n", set_trace(-1));
} else if (!strcmp(argv[i], "off")) {
trace_val = 0;
} else if (argv[i][0] == '+') {
trace_val |= get_code(argv[i]+1);
} else if (argv[i][0] == '-') {
trace_val &= (~get_code(argv[i]+1));
} else {
int n;
long a1,a2,a3;
n = sscanf(argv[i], "%li,%li,%li", &a1, &a2, &a3);
switch (n) {
case 1: /* Single value is a trace code */
trace_val = a1;
break;
case 2: /* Two arguments is a syscall query */
a3 = -1;
/* and drop through... */
case 3: /* Three arguments is a syscall set */
n = trace_func_set(a1, a2, a3);
if (n > 0)
printf("personality %d, syscall 0x%x - tracing enabled\n",
a1, a2);
else if (n == 0)
printf("personality %d, syscall 0x%x - tracing disabled\n",
a1, a2);
else
printf("personality %d, syscall 0x%x - no such call/personality\n",
a1, a2);
break;
default: /* could be a text code */
trace_val |= get_code(argv[i]);
break;
}
}
}
if (trace_val != old_trace_val)
printf("iBCS trace code is 0x%lx\n", set_trace(trace_val));
exit(0);
}
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