26 lines
806 B
C
26 lines
806 B
C
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#include <stdint.h>
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#include <assert.h>
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int main()
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{
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uintptr_t x, y;
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asm("mov %0, lr\n\t"
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"pacia %0, sp\n\t" /* sigill if pauth not supported */
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"eor %0, %0, #4\n\t" /* corrupt single bit */
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"mov %1, %0\n\t"
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"autia %1, sp\n\t" /* validate corrupted pointer */
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"xpaci %0\n\t" /* strip pac from corrupted pointer */
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: "=r"(x), "=r"(y));
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/*
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* Once stripped, the corrupted pointer is of the form 0x0000...wxyz.
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* We expect the autia to indicate failure, producing a pointer of the
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* form 0x000e....wxyz. Use xpaci and != for the test, rather than
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* extracting explicit bits from the top, because the location of the
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* error code "e" depends on the configuration of virtual memory.
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*/
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assert(x != y);
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return 0;
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}
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