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

   1         .text
   2         .arch generic32
   3
   4 #; func_locvars
   5 #; - function with a space on the stack
   6 #;   allocated for local variables
   7
   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 func_prologue:
  29         .cfi_startproc
  30
  31         #; prologue, CFI is valid after
  32         #; each instruction.
  33         pushl   %ebp
  34         .cfi_def_cfa_offset     8
  35         .cfi_offset             ebp,-8
  36         movl    %esp, %ebp
  37         .cfi_def_cfa_register   ebp
  38
  39         #; function body
  40         call    func_locvars
  41         addl    $3, %eax
  42
  43         #; epilogue with valid CFI
  44         #; (we're better than gcc :-)
  45         leave
  46         .cfi_def_cfa_register   esp
  47         ret
  48         .cfi_endproc
  49
  50 #; func_otherreg
  51 #; - function that moves frame pointer to
  52 #;   another register (ebx) and then allocates
  53 #;   a space for local variables
  54
  55 func_otherreg:
  56         .cfi_startproc
  57
  58         #; save frame pointer to ebx
  59         mov     %esp,%ebx
  60         .cfi_def_cfa_register   ebx
  61
  62         #; alocate space for local vars
  63         #;  (no .cfi_{def,adjust}_cfa_offset here,
  64         #;   because CFA is computed from ebx!)
  65         sub     $100,%esp
  66
  67         #; function body
  68         call    func_prologue
  69         add     $2, %eax
  70
  71         #; restore frame pointer from ebx
  72         mov     %ebx,%esp
  73         .cfi_def_cfa            esp,4
  74         ret
  75         .cfi_endproc
  76
  77 #; main
  78 #; - typical function
  79 main:
  80         .cfi_startproc
  81
  82         #; only function body that doesn't
  83         #; touch the stack at all.
  84         call    func_otherreg
  85
  86         #; return
  87         ret
  88         .cfi_endproc
  89
  90 #; _start
  91 #; - standard entry point
  92
  93         .globl  _start
  94 _start:
  95         .cfi_startproc
  96         call    main
  97         movl    %eax,%edi
  98         movl    $0x1,%eax
  99         int     $0x80
 100         hlt
 101         .cfi_endproc
 102
 103 #; func_all_registers
 104 #; - test for all .cfi register numbers.
 105 #;   This function is never called and the CFI info doesn't make sense.
 106
 107 func_all_registers:
 108         .cfi_startproc simple
 109
 110         .cfi_undefined eip      ; nop
 111         .cfi_undefined eax      ; nop
 112         .cfi_undefined ecx      ; nop
 113         .cfi_undefined edx      ; nop
 114         .cfi_undefined ebx      ; nop
 115         .cfi_undefined esp      ; nop
 116         .cfi_undefined ebp      ; nop
 117         .cfi_undefined esi      ; nop
 118         .cfi_undefined edi      ; nop
 119         .cfi_undefined eflags   ; nop
 120
 121         .cfi_undefined es       ; nop
 122         .cfi_undefined cs       ; nop
 123         .cfi_undefined ds       ; nop
 124         .cfi_undefined ss       ; nop
 125         .cfi_undefined fs       ; nop
 126         .cfi_undefined gs       ; nop
 127         .cfi_undefined tr       ; nop
 128         .cfi_undefined ldtr     ; nop
 129
 130         .cfi_undefined mxcsr    ; nop
 131         .cfi_undefined xmm0     ; nop
 132         .cfi_undefined xmm1     ; nop
 133         .cfi_undefined xmm2     ; nop
 134         .cfi_undefined xmm3     ; nop
 135         .cfi_undefined xmm4     ; nop
 136         .cfi_undefined xmm5     ; nop
 137         .cfi_undefined xmm6     ; nop
 138         .cfi_undefined xmm7     ; nop
 139
 140         .cfi_undefined fcw      ; nop
 141         .cfi_undefined fsw      ; nop
 142         .cfi_undefined st       ; nop
 143         .cfi_undefined st(1)    ; nop
 144         .cfi_undefined st(2)    ; nop
 145         .cfi_undefined st(3)    ; nop
 146         .cfi_undefined st(4)    ; nop
 147         .cfi_undefined st(5)    ; nop
 148         .cfi_undefined st(6)    ; nop
 149         .cfi_undefined st(7)    ; nop
 150
 151         .cfi_undefined mm0      ; nop
 152         .cfi_undefined mm1      ; nop
 153         .cfi_undefined mm2      ; nop
 154         .cfi_undefined mm3      ; nop
 155         .cfi_undefined mm4      ; nop
 156         .cfi_undefined mm5      ; nop
 157         .cfi_undefined mm6      ; nop
 158         .cfi_undefined mm7      ; nop
 159
 160         .cfi_undefined k0       ; nop
 161         .cfi_undefined k1       ; nop
 162         .cfi_undefined k2       ; nop
 163         .cfi_undefined k3       ; nop
 164         .cfi_undefined k4       ; nop
 165         .cfi_undefined k5       ; nop
 166         .cfi_undefined k6       ; nop
 167         .cfi_undefined k7       ; nop
 168
 169         .cfi_endproc