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/*
* Copyright 2015, Michael Neuling, IBM Corp.
* Licensed under GPLv2.
*
* Test the kernel's signal delievery code to ensure that we don't
* trelaim twice in the kernel signal delivery code. This can happen
* if we trigger a signal when in a transaction and the stack pointer
* is bogus.
*
* This test case registers a SEGV handler, sets the stack pointer
* (r1) to NULL, starts a transaction and then generates a SEGV. The
* SEGV should be handled but we exit here as the stack pointer is
* invalid and hance we can't sigreturn. We only need to check that
* this flow doesn't crash the kernel.
*/
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include "utils.h"
#include "tm.h"
void signal_segv(int signum)
{
/* This should never actually run since stack is foobar */
exit(1);
}
int tm_signal_stack()
{
int pid;
SKIP_IF(!have_htm());
pid = fork();
if (pid < 0)
exit(1);
if (pid) { /* Parent */
/*
* It's likely the whole machine will crash here so if
* the child ever exits, we are good.
*/
wait(NULL);
return 0;
}
/*
* The flow here is:
* 1) register a signal handler (so signal delievery occurs)
* 2) make stack pointer (r1) = NULL
* 3) start transaction
* 4) cause segv
*/
if (signal(SIGSEGV, signal_segv) == SIG_ERR)
exit(1);
asm volatile("li 1, 0 ;" /* stack ptr == NULL */
"1:"
"tbegin.;"
"beq 1b ;" /* retry forever */
"tsuspend.;"
"ld 2, 0(1) ;" /* trigger segv" */
: : : "memory");
/* This should never get here due to above segv */
return 1;
}
int main(void)
{
return test_harness(tm_signal_stack, "tm_signal_stack");
}
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