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/* $OpenBSD: unalign.c,v 1.2 2008/07/26 10:25:04 miod Exp $ */
/* Written by Miod Vallat, 2004 AD -- this file is in the public domain */
/*
* This test checks for the ability, for 32 bit systems, to correctly
* access a long long (64 bit) value aligned on a 32 bit boundary, but not
* on a 64 bit boundary.
*
* All architectures should pass this test; on m88k this requires assistance
* from the kernel to recover from the misaligned operand exception: see
* double_reg_fixup() in arch/m88k/m88k/trap.c for details.
*/
#include <stdio.h>
#include <sys/types.h>
uint32_t array[5];
int
unalign_read(uint64_t *addr)
{
uint64_t t;
t = *addr;
#if BYTE_ORDER == BIG_ENDIAN
if (t != 0x13579aceffffabcdULL)
#else
if (t != 0xffffabcd13579aceULL)
#endif
return (1);
return (0);
}
void
unalign_write(uint64_t *addr)
{
uint64_t t;
t = 0xdeadbeaffadebabeULL;
*addr = t;
}
int
main(int argc, char *argv[])
{
#if !defined(__LP64__)
uint32_t *addr = array;
/* align on a 64 bit boundary */
if (((uint32_t)addr & 7) != 0)
addr++;
addr[0] = 0x12345678;
addr[1] = 0x13579ace;
addr[2] = 0xffffabcd;
addr[3] = 0x2468fedc;
if (unalign_read((uint64_t *)(addr + 1)))
return (1);
unalign_write((uint64_t *)(addr + 1));
#if BYTE_ORDER == BIG_ENDIAN
if (addr[1] != 0xdeadbeaf || addr[2] != 0xfadebabe)
#else
if (addr[1] != 0xfadebabe || addr[2] != 0xdeadbeaf)
#endif
return (1);
#endif /* __LP64__ */
return (0);
}
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