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/* This test tests whether registers are correctly restored after a
* signal handler is executed. The assembly file (test57loop.S) puts
* 'random' values in the registers, and the C code checks whether
* these values are the same, before and after the signal handler.
*/
#define _POSIX_SOURCE 1
#include <stdio.h>
#include <signal.h>
#include <err.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#define SIGNAL SIGUSR1
volatile int remaining_invocations = 2, handler_level = 0;
void check_context_loop(void);
#define REGS 8 /* how many registers pusha and popa save. */
#define ESP 3 /* where is esp saved? */
unsigned long newstate[REGS], origstate[REGS];
static void handler(int signal)
{
int st;
sigset_t set, oset;
handler_level++;
remaining_invocations--;
if(remaining_invocations < 1)
return;
sigemptyset(&set);
sigaddset(&set, SIGNAL);
sigprocmask(SIG_UNBLOCK, &set, &oset);
wait(&st);
handler_level--;
}
int main(int argc, char *argv[])
{
pid_t child_pid;
printf("Test 57 ");
if(signal(SIGNAL, handler) == SIG_ERR)
err(1, "signal");
fflush(NULL);
if((child_pid=fork()) < 0)
err(1, "fork");
if(child_pid == 0) {
pid_t ppid = 0;
/* Keep signaling the parent until
* it disappears.
*/
while((ppid = getppid()) > 1) {
if(kill(ppid, SIGNAL) < 0)
err(1, "kill");
sleep(1);
}
exit(0);
} else {
int i;
int err = 0;
check_context_loop();
/* correct 2nd esp for 'pusha' difference. */
newstate[ESP] += REGS*4;
for(i = 0; i < REGS; i++) {
#if 0
printf("%d %08lx %08lx diff ",
i, newstate[i], origstate[i]);
#endif
if(newstate[i] != origstate[i]) {
fprintf(stderr, "reg %d changed; "
"found 0x%lx, expected 0x%lx\n",
i, newstate[i], origstate[i]);
err = 1;
}
}
if(!err) printf("ok\n");
exit(err);
}
return 0;
}
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