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/* $OpenBSD: probe.c,v 1.1 2004/05/12 22:54:13 mickey Exp $ */
/*
* Written by Michael Shalayeff, 2004. Public Domain.
*/
#include <sys/param.h>
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <err.h>
char moo[] = "moo"; /* writable */
const char blah[] = "blah"; /* not */
volatile char *label;
#define prober(r,a) __asm __volatile( \
"prober (%2),%1,%0" : "=r" (r) : "r" (3), "r" (a));
#define proberi(r,a) __asm __volatile( \
"proberi (%2),%1,%0" : "=r" (r) : "i" (3), "r" (a));
#define probew(r,a) __asm __volatile( \
"probew (%2),%1,%0" : "=r" (r) : "r" (3), "r" (a));
#define probewi(r,a) __asm __volatile( \
"probewi (%2),%1,%0" : "=r" (r) : "i" (3), "r" (a));
void
sigsegv(int sig, siginfo_t *sip, void *scp)
{
char buf[1024];
snprintf(buf, sizeof buf, "%s not decoded\n", label);
write(STDOUT_FILENO, buf, strlen(buf));
_exit(1);
}
int
main(int argc, char *argv[])
{
struct sigaction sa;
int rv;
sa.sa_sigaction = &sigsegv;
sa.sa_flags = SA_SIGINFO;
sigemptyset(&sa.sa_mask);
sigaction(SIGSEGV, &sa, NULL);
#define test_probe(n,a,r) \
label = #n; \
n(rv, a); \
if (rv != (r)) \
errx(1, "%s(%p) returned %d", label, (a), rv);
test_probe(prober, 1, 0);
test_probe(prober, &blah, 1);
test_probe(proberi, 1, 0);
test_probe(proberi, &blah, 1);
test_probe(probew, 1, 0);
test_probe(probew, &blah, 0);
test_probe(probew, &moo, 1);
test_probe(probewi, 1, 0);
test_probe(probewi, &blah, 0);
test_probe(probewi, &moo, 1);
exit(0);
}
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