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#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
static void mvcrl(const char *dst, const char *src, size_t len)
{
register long r0 asm("r0") = len;
asm volatile (
".insn sse, 0xE50A00000000, 0(%[dst]), 0(%[src])"
: : [dst] "d" (dst), [src] "d" (src), "r" (r0)
: "memory");
}
static bool test(void)
{
const char *alpha = "abcdefghijklmnop";
/* array missing 'i' */
char tstr[17] = "abcdefghjklmnop\0";
/* mvcrl reference use: 'open a hole in an array' */
mvcrl(tstr + 9, tstr + 8, 8);
/* place missing 'i' */
tstr[8] = 'i';
return strncmp(alpha, tstr, 16ul) == 0;
}
static bool test_bad_r0(void)
{
char src[256] = { 0 };
/*
* PoP says: Bits 32-55 of general register 0 should contain zeros;
* otherwise, the program may not operate compatibly in the future.
*
* Try it anyway in order to check whether this would crash QEMU itself.
*/
mvcrl(src, src, (size_t)-1);
return true;
}
int main(void)
{
bool ok = true;
ok &= test();
ok &= test_bad_r0();
return ok ? EXIT_SUCCESS : EXIT_FAILURE;
}
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