47 lines
968 B
C
47 lines
968 B
C
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/* Test PC misalignment exception */
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#ifdef __thumb__
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#error "This test must be compiled for ARM"
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#endif
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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 <stdio.h>
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static void *expected;
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static void sigbus(int sig, siginfo_t *info, void *vuc)
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{
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assert(info->si_code == BUS_ADRALN);
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assert(info->si_addr == expected);
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exit(EXIT_SUCCESS);
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}
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int main()
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{
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void *tmp;
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struct sigaction sa = {
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.sa_sigaction = sigbus,
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.sa_flags = SA_SIGINFO
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};
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if (sigaction(SIGBUS, &sa, NULL) < 0) {
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perror("sigaction");
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return EXIT_FAILURE;
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}
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asm volatile("adr %0, 1f + 2\n\t"
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"str %0, %1\n\t"
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"bx %0\n"
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"1:"
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: "=&r"(tmp), "=m"(expected));
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/*
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* From v8, it is CONSTRAINED UNPREDICTABLE whether BXWritePC aligns
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* the address or not. If so, we can legitimately fall through.
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*/
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return EXIT_SUCCESS;
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}
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