gas/testsuite/gas/cfi/cfi-i386.s

   1         .text
   2
   3 #; func_locvars
   4 #; - function with a space on the stack
   5 #;   allocated for local variables
   6
   7 func_locvars:
   8         .cfi_startproc
   9
  10         #; alocate space for local vars
  11         sub     $0x1234,%esp
  12         .cfi_adjust_cfa_offset  0x1234
  13
  14         #; dummy body
  15         movl    $1,%eax
  16
  17         #; release space of local vars and return
  18         add     $0x1234,%esp
  19         .cfi_adjust_cfa_offset  -0x1234
  20         ret
  21         .cfi_endproc
  22
  23 #; func_prologue
  24 #; - functions that begins with standard
  25 #;   prologue: "pushq %rbp; movq %rsp,%rbp"
  26
  27 func_prologue:
  28         .cfi_startproc
  29
  30         #; prologue, CFI is valid after
  31         #; each instruction.
  32         pushl   %ebp
  33         .cfi_def_cfa_offset     8
  34         .cfi_offset             ebp,-8
  35         movl    %esp, %ebp
  36         .cfi_def_cfa_register   ebp
  37
  38         #; function body
  39         call    func_locvars
  40         addl    $3, %eax
  41
  42         #; epilogue with valid CFI
  43         #; (we're better than gcc :-)
  44         leave
  45         .cfi_def_cfa_register   esp
  46         ret
  47         .cfi_endproc
  48
  49 #; func_otherreg
  50 #; - function that moves frame pointer to
  51 #;   another register (ebx) and then allocates
  52 #;   a space for local variables
  53
  54 func_otherreg:
  55         .cfi_startproc
  56
  57         #; save frame pointer to ebx
  58         mov     %esp,%ebx
  59         .cfi_def_cfa_register   ebx
  60
  61         #; alocate space for local vars
  62         #;  (no .cfi_{def,adjust}_cfa_offset here,
  63         #;   because CFA is computed from ebx!)
  64         sub     $100,%esp
  65
  66         #; function body
  67         call    func_prologue
  68         add     $2, %eax
  69
  70         #; restore frame pointer from ebx
  71         mov     %ebx,%esp
  72         .cfi_def_cfa            esp,4
  73         ret
  74         .cfi_endproc
  75
  76 #; main
  77 #; - typical function
  78 main:
  79         .cfi_startproc
  80
  81         #; only function body that doesn't
  82         #; touch the stack at all.
  83         call    func_otherreg
  84
  85         #; return
  86         ret
  87         .cfi_endproc
  88
  89 #; _start
  90 #; - standard entry point
  91
  92         .globl  _start
  93 _start:
  94         .cfi_startproc
  95         call    main
  96         movl    %eax,%edi
  97         movl    $0x1,%eax
  98         int     $0x80
  99         hlt
 100         .cfi_endproc
 101
 102 #; func_all_registers
 103 #; - test for all .cfi register numbers.
 104 #;   This function is never called and the CFI info doesn't make sense.
 105
 106 func_all_registers:
 107         .cfi_startproc simple
 108
 109         .cfi_undefined eip      ; nop
 110         .cfi_undefined eax      ; nop
 111         .cfi_undefined ecx      ; nop
 112         .cfi_undefined edx      ; nop
 113         .cfi_undefined ebx      ; nop
 114         .cfi_undefined esp      ; nop
 115         .cfi_undefined ebp      ; nop
 116         .cfi_undefined esi      ; nop
 117         .cfi_undefined edi      ; nop
 118         .cfi_undefined eflags   ; nop
 119
 120         .cfi_undefined es       ; nop
 121         .cfi_undefined cs       ; nop
 122         .cfi_undefined ds       ; nop
 123         .cfi_undefined ss       ; nop
 124         .cfi_undefined fs       ; nop
 125         .cfi_undefined gs       ; nop
 126         .cfi_undefined tr       ; nop
 127         .cfi_undefined ldtr     ; nop
 128
 129         .cfi_undefined mxcsr    ; nop
 130         .cfi_undefined xmm0     ; nop
 131         .cfi_undefined xmm1     ; nop
 132         .cfi_undefined xmm2     ; nop
 133         .cfi_undefined xmm3     ; nop
 134         .cfi_undefined xmm4     ; nop
 135         .cfi_undefined xmm5     ; nop
 136         .cfi_undefined xmm6     ; nop
 137         .cfi_undefined xmm7     ; nop
 138
 139         .cfi_undefined fcw      ; nop
 140         .cfi_undefined fsw      ; nop
 141         .cfi_undefined st       ; nop
 142         .cfi_undefined st(1)    ; nop
 143         .cfi_undefined st(2)    ; nop
 144         .cfi_undefined st(3)    ; nop
 145         .cfi_undefined st(4)    ; nop
 146         .cfi_undefined st(5)    ; nop
 147         .cfi_undefined st(6)    ; nop
 148         .cfi_undefined st(7)    ; nop
 149
 150         .cfi_undefined mm0      ; nop
 151         .cfi_undefined mm1      ; nop
 152         .cfi_undefined mm2      ; nop
 153         .cfi_undefined mm3      ; nop
 154         .cfi_undefined mm4      ; nop
 155         .cfi_undefined mm5      ; nop
 156         .cfi_undefined mm6      ; nop
 157         .cfi_undefined mm7      ; nop
 158
 159         .cfi_endproc