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/*
* Berkeley Lab Checkpoint/Restart (BLCR) for Linux is Copyright (c)
* 2009, The Regents of the University of California, through Lawrence
* Berkeley National Laboratory (subject to receipt of any required
* approvals from the U.S. Dept. of Energy). All rights reserved.
*
* Portions may be copyrighted by others, as may be noted in specific
* copyright notices within specific files.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: bug2524.c,v 1.1.2.3 2009/02/27 20:31:36 phargrov Exp $
*
* Look for bug 2524 (ppc-specific reg save problem)
*/
#include <stdio.h>
#include <unistd.h>
#include <asm/unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <errno.h>
#include "blcr_config.h"
#if !(defined(__ppc64__) || defined(__powerpc64__) || defined(__ppc__) || defined(__powerpc__))
/* Test is ppc-specific (uses asm) */
int main(void) {
return 77; // automake's "SKIP" code
}
#else
void handler(int sig) {
asm volatile ("li %r28,99");
}
int test_it(void) {
int i, q = 111;
sigset_t mask;
sigemptyset(&mask);
sigprocmask(SIG_BLOCK, NULL, &mask);
for (i=0; i<1000; ++i) {
asm volatile ( // r28 = 0; sigsuspend(&mask); q = %r28
" li %%r28,0\n"
" li %%r0,%3\n"
" mr %%r3,%2\n"
" li %%r4,%4\n"
" sc\n"
" mr %0,%%r28\n"
: "=&r" (q)
: "0" (q), "r" (&mask), "i" (__NR_rt_sigsuspend), "i" (_NSIG/8)
: "cr0", "ctr", "memory", "r0", "r3", "r4", "r9", "r10","r11", "r12", "r28");
if (q) break;
}
return q;
}
int main(void) {
struct sigaction sa;
int rc;
sa.sa_sigaction = (void*)handler;
sa.sa_flags = SA_RESTART | SA_SIGINFO;
sigemptyset(&sa.sa_mask);
rc = sigaction(SIGUSR1, &sa, NULL);
if (rc < 0) {
perror("sigaction()");
exit(1);
}
rc = fork();
if (rc < 0) {
perror("fork()");
exit(1);
} else if (!rc) {
while (!kill(getppid(), SIGUSR1)) {/*empty*/}
} else if (test_it()) {
#if !CR_HAVE_BUG2524
fputs("ERROR: Your kernel appears to be affected by a bug, seen in kernels 2.6.15 and older. Please reconfigure blcr with '--with-bug2524' to enable blcr's work around for this bug.\n", stderr);
exit(1);
#endif
} else {
#if CR_HAVE_BUG2524
fputs("INFO: Your kernel appears NOT to be affected by bug 2524, but BLCR has been configured to work around it anyway. You could safely reconfigure BLCR with '--without-bug2524' if you wish.\n", stderr);
#endif
}
return 0;
}
#endif /* PPC */
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