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