Yaya48
cf256aa081
Upstream: https://gitlab.com/qemu-project/qemu.git Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/*
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* Test that a faulting STORE CLOCK FAST does not clobber the condition code.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include <assert.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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static void handle_sigsegv(int sig, siginfo_t *info, void *ucontext)
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{
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mcontext_t *mcontext = &((ucontext_t *)ucontext)->uc_mcontext;
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/* The condition code must be the one set by SLGR, not garbage. */
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_exit(((mcontext->psw.mask >> 44) & 3) == 3 ? EXIT_SUCCESS : EXIT_FAILURE);
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}
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int main(void)
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{
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struct sigaction act = {
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.sa_sigaction = handle_sigsegv,
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.sa_flags = SA_SIGINFO,
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};
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int err;
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err = sigaction(SIGSEGV, &act, NULL);
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assert(err == 0);
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asm volatile(
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"lghi %%r1,100\n"
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"lghi %%r2,0\n"
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"clgr %%r1,%%r2\n" /* CC_OP_LTUGTU_64 */
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/* cc_src=100 is not valid for CC_OP_SUBU */
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"ipm %%r0\n" /* force cc_src to env */
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"lghi %%r3,5\n"
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"lghi %%r4,3\n"
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"slgr %%r3,%%r4\n" /* CC_OP_SUBU, cc=3 */
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"lghi %%r5,0\n"
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"stckf 0(%%r5)\n" /* faults; cc must stay 3 */
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: : : "r0", "r1", "r2", "r3", "r4", "r5", "cc", "memory");
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return EXIT_FAILURE;
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}
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