43 lines
911 B
C
43 lines
911 B
C
#include <assert.h>
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#include <stdint.h>
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#include <signal.h>
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#include <sys/user.h>
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#define XER_SO (1 << 31)
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#define XER_OV (1 << 30)
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#define XER_CA (1 << 29)
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#define XER_OV32 (1 << 19)
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#define XER_CA32 (1 << 18)
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uint64_t saved;
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void sigill_handler(int sig, siginfo_t *si, void *ucontext)
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{
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ucontext_t *uc = ucontext;
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uc->uc_mcontext.regs->nip += 4;
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saved = uc->uc_mcontext.regs->xer;
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uc->uc_mcontext.regs->xer |= XER_OV | XER_OV32;
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}
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int main(void)
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{
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uint64_t initial = XER_CA | XER_CA32, restored;
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struct sigaction sa = {
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.sa_sigaction = sigill_handler,
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.sa_flags = SA_SIGINFO
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};
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sigaction(SIGILL, &sa, NULL);
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asm("mtspr 1, %1\n\t"
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".long 0x0\n\t"
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"mfspr %0, 1\n\t"
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: "=r" (restored)
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: "r" (initial));
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assert(saved == initial);
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assert(restored == (XER_OV | XER_OV32 | XER_CA | XER_CA32));
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return 0;
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}
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