1 /* $OpenBSD: unalign.c,v 1.2 2008/07/26 10:25:04 miod Exp $ */ 2 /* Written by Miod Vallat, 2004 AD -- this file is in the public domain */ 3 4 /* 5 * This test checks for the ability, for 32 bit systems, to correctly 6 * access a long long (64 bit) value aligned on a 32 bit boundary, but not 7 * on a 64 bit boundary. 8 * 9 * All architectures should pass this test; on m88k this requires assistance 10 * from the kernel to recover from the misaligned operand exception: see 11 * double_reg_fixup() in arch/m88k/m88k/trap.c for details. 12 */ 13 14 #include <stdio.h> 15 #include <sys/types.h> 16 17 uint32_t array[5]; 18 19 int 20 unalign_read(uint64_t *addr) 21 { 22 uint64_t t; 23 24 t = *addr; 25 #if BYTE_ORDER == BIG_ENDIAN 26 if (t != 0x13579aceffffabcdULL) 27 #else 28 if (t != 0xffffabcd13579aceULL) 29 #endif 30 return (1); 31 32 return (0); 33 } 34 35 void 36 unalign_write(uint64_t *addr) 37 { 38 uint64_t t; 39 40 t = 0xdeadbeaffadebabeULL; 41 *addr = t; 42 } 43 44 int 45 main(int argc, char *argv[]) 46 { 47 #if !defined(__LP64__) 48 uint32_t *addr = array; 49 50 /* align on a 64 bit boundary */ 51 if (((uint32_t)addr & 7) != 0) 52 addr++; 53 54 addr[0] = 0x12345678; 55 addr[1] = 0x13579ace; 56 addr[2] = 0xffffabcd; 57 addr[3] = 0x2468fedc; 58 59 if (unalign_read((uint64_t *)(addr + 1))) 60 return (1); 61 62 unalign_write((uint64_t *)(addr + 1)); 63 64 #if BYTE_ORDER == BIG_ENDIAN 65 if (addr[1] != 0xdeadbeaf || addr[2] != 0xfadebabe) 66 #else 67 if (addr[1] != 0xfadebabe || addr[2] != 0xdeadbeaf) 68 #endif 69 return (1); 70 #endif /* __LP64__ */ 71 72 return (0); 73 } 74