tests/test-i386-code16.S

   1         .code16
   2         .globl code16_start
   3         .globl code16_end
   4
   5 CS_SEG = 0xf
   6
   7 code16_start:
   8
   9         .globl code16_func1
  10
  11         /* basic test */
  12 code16_func1 = . - code16_start
  13         mov $1, %eax
  14         data32 lret
  15
  16 /* test push/pop in 16 bit mode */
  17         .globl code16_func2
  18 code16_func2 = . - code16_start
  19         xor %eax, %eax
  20         mov $0x12345678, %ebx
  21         movl %esp, %ecx
  22         push %bx
  23         subl %esp, %ecx
  24         pop %ax
  25         data32 lret
  26
  27 /* test various jmp opcodes */
  28         .globl code16_func3
  29 code16_func3 = . - code16_start
  30         jmp 1f
  31         nop
  32 1:
  33         mov $4, %eax
  34         mov $0x12345678, %ebx
  35         xor %bx, %bx
  36         jz 2f
  37         add $2, %ax
  38 2:
  39
  40         call myfunc
  41
  42         lcall $CS_SEG, $(myfunc2 - code16_start)
  43
  44         ljmp $CS_SEG, $(myjmp1 - code16_start)
  45 myjmp1_next:
  46
  47         cs lcall myfunc2_addr - code16_start
  48
  49         cs ljmp myjmp2_addr - code16_start
  50 myjmp2_next:
  51
  52         data32 lret
  53
  54 myfunc2_addr:
  55         .short myfunc2 - code16_start
  56         .short CS_SEG
  57
  58 myjmp2_addr:
  59         .short myjmp2 - code16_start
  60         .short CS_SEG
  61
  62 myjmp1:
  63         add $8, %ax
  64         jmp myjmp1_next
  65
  66 myjmp2:
  67         add $16, %ax
  68         jmp myjmp2_next
  69
  70 myfunc:
  71         add $1, %ax
  72         ret
  73
  74 myfunc2:
  75         add $4, %ax
  76         lret
  77
  78
  79 code16_end: