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         .type   func_locvars,@function
   8 func_locvars:
   9         .cfi_startproc
  10
  11         #; alocate space for local vars
  12         sub     $0x1234,%esp
  13         .cfi_adjust_cfa_offset  0x1234
  14
  15         #; dummy body
  16         movl    $1,%eax
  17
  18         #; release space of local vars and return
  19         add     $0x1234,%esp
  20         .cfi_adjust_cfa_offset  -0x1234
  21         ret
  22         .cfi_endproc
  23
  24 #; func_prologue
  25 #; - functions that begins with standard
  26 #;   prologue: "pushq %rbp; movq %rsp,%rbp"
  27
  28         .type   func_prologue,@function
  29 func_prologue:
  30         .cfi_startproc
  31
  32         #; prologue, CFI is valid after
  33         #; each instruction.
  34         pushl   %ebp
  35         .cfi_def_cfa_offset     8
  36         .cfi_offset             ebp,-8
  37         movl    %esp, %ebp
  38         .cfi_def_cfa_register   ebp
  39
  40         #; function body
  41         call    func_locvars
  42         addl    $3, %eax
  43
  44         #; epilogue with valid CFI
  45         #; (we're better than gcc :-)
  46         leave
  47         .cfi_def_cfa_register   esp
  48         ret
  49         .cfi_endproc
  50
  51 #; func_otherreg
  52 #; - function that moves frame pointer to
  53 #;   another register (ebx) and then allocates
  54 #;   a space for local variables
  55
  56         .type   func_otherreg,@function
  57 func_otherreg:
  58         .cfi_startproc
  59
  60         #; save frame pointer to ebx
  61         mov     %esp,%ebx
  62         .cfi_def_cfa_register   ebx
  63
  64         #; alocate space for local vars
  65         #;  (no .cfi_{def,adjust}_cfa_offset here,
  66         #;   because CFA is computed from ebx!)
  67         sub     $100,%esp
  68
  69         #; function body
  70         call    func_prologue
  71         add     $2, %eax
  72
  73         #; restore frame pointer from ebx
  74         mov     %ebx,%esp
  75         .cfi_def_cfa            esp,4
  76         ret
  77         .cfi_endproc
  78
  79 #; main
  80 #; - typical function
  81         .type   main,@function
  82 main:
  83         .cfi_startproc
  84
  85         #; only function body that doesn't
  86         #; touch the stack at all.
  87         call    func_otherreg
  88
  89         #; return
  90         ret
  91         .cfi_endproc
  92
  93 #; _start
  94 #; - standard entry point
  95
  96         .type   _start,@function
  97         .globl  _start
  98 _start:
  99         .cfi_startproc
 100         call    main
 101         movl    %eax,%edi
 102         movl    $0x1,%eax
 103         int     $0x80
 104         hlt
 105         .cfi_endproc
 106
 107 #; func_all_registers
 108 #; - test for all .cfi register numbers.
 109 #;   This function is never called and the CFI info doesn't make sense.
 110
 111         .type   func_all_registers,@function
 112 func_all_registers:
 113         .cfi_startproc simple
 114
 115         .cfi_undefined eip      ; nop
 116         .cfi_undefined eax      ; nop
 117         .cfi_undefined ecx      ; nop
 118         .cfi_undefined edx      ; nop
 119         .cfi_undefined ebx      ; nop
 120         .cfi_undefined esp      ; nop
 121         .cfi_undefined ebp      ; nop
 122         .cfi_undefined esi      ; nop
 123         .cfi_undefined edi      ; nop
 124         .cfi_undefined eflags   ; nop
 125
 126         .cfi_undefined es       ; nop
 127         .cfi_undefined cs       ; nop
 128         .cfi_undefined ds       ; nop
 129         .cfi_undefined ss       ; nop
 130         .cfi_undefined fs       ; nop
 131         .cfi_undefined gs       ; nop
 132         .cfi_undefined tr       ; nop
 133         .cfi_undefined ldtr     ; nop
 134
 135         .cfi_undefined mxcsr    ; nop
 136         .cfi_undefined xmm0     ; nop
 137         .cfi_undefined xmm1     ; nop
 138         .cfi_undefined xmm2     ; nop
 139         .cfi_undefined xmm3     ; nop
 140         .cfi_undefined xmm4     ; nop
 141         .cfi_undefined xmm5     ; nop
 142         .cfi_undefined xmm6     ; nop
 143         .cfi_undefined xmm7     ; nop
 144
 145         .cfi_undefined fcw      ; nop
 146         .cfi_undefined fsw      ; nop
 147         .cfi_undefined st       ; nop
 148         .cfi_undefined st(1)    ; nop
 149         .cfi_undefined st(2)    ; nop
 150         .cfi_undefined st(3)    ; nop
 151         .cfi_undefined st(4)    ; nop
 152         .cfi_undefined st(5)    ; nop
 153         .cfi_undefined st(6)    ; nop
 154         .cfi_undefined st(7)    ; nop
 155
 156         .cfi_undefined mm0      ; nop
 157         .cfi_undefined mm1      ; nop
 158         .cfi_undefined mm2      ; nop
 159         .cfi_undefined mm3      ; nop
 160         .cfi_undefined mm4      ; nop
 161         .cfi_undefined mm5      ; nop
 162         .cfi_undefined mm6      ; nop
 163         .cfi_undefined mm7      ; nop
 164
 165         .cfi_endproc