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