1 # many thanks to David Fang 2 # for providing an OSX 10.5 machine to test on 3 4 # count for 1 million instructions 5 # total is 1 + 1 + 499997*2 + 4 6 7 .globl _start 8 _start: 9 xor %ecx,%ecx # not needed, pads total to 1M 10 mov $499997,%ecx # load counter 11 test_loop: 12 dec %ecx # repeat count times 13 jnz test_loop 14 15 #================================ 16 # Exit 17 #================================ 18 19 # syscall numbers in /usr/include/sys/syscall.h on OSX 20 # in arc/x86/include/asm/unistd_32.h on Linux 21 # disassemble on OSX otool -tV 22 exit: 23 #ifdef VGO_darwin 24 pushl $0 # we return 0 25 xor %eax,%eax 26 inc %eax # put exit syscall number (1) in eax 27 int $0x80 # and exit 28 #else 29 xor %ebx,%ebx # we return 0 30 xor %eax,%eax 31 inc %eax # put exit syscall number (1) in eax 32 int $0x80 # and exit 33 #endif 34
