bfde1be8b3
Add a small test to prevent regressions. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Message-Id: <20230704081506.276055-13-iii@linux.ibm.com> [thuth: Apply fix for compiling with GCC 11] Signed-off-by: Thomas Huth <thuth@redhat.com>
56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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static void mvcrl(const char *dst, const char *src, size_t len)
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{
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register long r0 asm("r0") = len;
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asm volatile (
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".insn sse, 0xE50A00000000, 0(%[dst]), 0(%[src])"
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: : [dst] "d" (dst), [src] "d" (src), "r" (r0)
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: "memory");
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}
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static bool test(void)
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{
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const char *alpha = "abcdefghijklmnop";
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/* array missing 'i' */
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char tstr[17] = "abcdefghjklmnop\0";
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/* mvcrl reference use: 'open a hole in an array' */
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mvcrl(tstr + 9, tstr + 8, 8);
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/* place missing 'i' */
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tstr[8] = 'i';
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return strncmp(alpha, tstr, 16ul) == 0;
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}
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static bool test_bad_r0(void)
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{
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char src[256] = { 0 };
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/*
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* PoP says: Bits 32-55 of general register 0 should contain zeros;
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* otherwise, the program may not operate compatibly in the future.
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*
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* Try it anyway in order to check whether this would crash QEMU itself.
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*/
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mvcrl(src, src, (size_t)-1);
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return true;
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}
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int main(void)
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{
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bool ok = true;
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ok &= test();
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ok &= test_bad_r0();
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return ok ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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