mirror of
https://github.com/ioacademy-jikim/debugging
synced 2025-06-11 09:56:29 +00:00
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
/* zArchitecture specifies that operation exception(illegal opcode) is
|
|
suppressing. That means that the program check old psw will point to
|
|
the instruction after the illegal one (according to the calculated length).
|
|
There are some programs out there that use this mechanism to detect available
|
|
intruction (sigh).
|
|
This patch checks, that valgrind makes forard progress. */
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
static volatile int got_ill;
|
|
static void handle_ill(int sig)
|
|
{
|
|
got_ill = 1;
|
|
}
|
|
int main()
|
|
{
|
|
struct sigaction sa;
|
|
|
|
memset(&sa, 0, sizeof(sa));
|
|
sa.sa_handler = handle_ill;
|
|
sigaction(SIGILL, &sa, NULL);
|
|
|
|
got_ill = 0;
|
|
/* most architectures loop here, but on s390 this would increase the
|
|
PSW by 2 and then by 2 */
|
|
asm volatile(".long 0\n");
|
|
if (got_ill)
|
|
printf("0x00000000 does not loop\n");
|
|
|
|
got_ill = 0;
|
|
/* most architectures loop here, but on s390 this would increase the
|
|
PSW by 6 and then by 2*/
|
|
asm volatile(".long 0xffffffff\n.long 0xffff0000\n");
|
|
if (got_ill)
|
|
printf("0xffffffff does not loop\n");
|
|
return 0;
|
|
}
|
|
|