exp-bbv/tests/amd64-linux/clone_test.S

   1              # count for ~1 million instructions thread 1
   2              # count for ~2 million instructions thread 2
   3              # count for additional 500 million each before exit
   4
   5         .globl _start
   6 _start:
   7
   8         #################################################
   9         # 1000 cycles in initial thread                 #
  10         #################################################
  11
  12         xor     %rax,%rax
  13         mov     $499,%rcx               # load counter
  14 initial_loop:
  15         dec     %rcx                    # repeat count times
  16         jnz     initial_loop
  17
  18
  19         #####################################################
  20         # Spawn a thread!                                   #
  21         #####################################################
  22 clone:
  23         mov    $56,%rax                 # clone syscall
  24
  25         # Note, clone syscall is different than the glibc implementation
  26
  27 #       int clone (flags, stack_pointer,parent_tidptr,child_tidptr,tls)
  28
  29
  30                                         # Flags in
  31                                         #/usr/include/bits/sched.h
  32                                         # CLONE_THREAD 0x10000
  33                                         # CLONE_SIGHAND 0x800
  34                                         # CLONE_VM      0x100
  35                                         # above must be called together
  36                                         # Below required for Valgrind
  37                                         # CLONE_FS       0x200
  38                                         # CLONE_FILES    0x400
  39
  40         mov    $0x10f00,%rdi
  41
  42
  43         mov    $(new_stack+4096),%rsi                   # new stack
  44
  45
  46
  47         mov    $0,%rdx          # args (none)
  48
  49         syscall
  50
  51         cmp   $0,%rax           # are we in new thread?
  52         jz    thread2           # if so, jump to thrad2
  53
  54
  55         ###############################################
  56         # thread1                                     #
  57         ###############################################
  58
  59 thread1:
  60
  61         mov     $499997,%rcx            # load counter
  62 thread1_loop:
  63         dec     %rcx                    # repeat count times
  64         jnz     thread1_loop
  65
  66         xor     %rdi,%rdi               # we return 0
  67         jmp    exit
  68
  69 thread2:
  70         mov     $999997,%rcx            # load counter
  71 thread2_loop:
  72         dec     %rcx                    # repeat count times
  73         jnz     thread2_loop
  74
  75         mov    $5,%rdi                  # we return 5
  76
  77
  78         #================================
  79         # Exit
  80         #================================
  81 exit:
  82
  83         # count an additional 500 million
  84
  85         mov     $250000,%rcx            # load counter
  86 exit_loop:
  87         dec     %rcx                    # repeat count times
  88         jnz     exit_loop
  89
  90 actual_exit:
  91         mov     $60,%rax                # put exit syscall number (60) in rax
  92         syscall
  93
  94 .bss
  95 .lcomm  new_stack,4096