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        .text

#; func_locvars

#; - function with a space on the stack 

#;   allocated for local variables

        .type   func_locvars,@function

func_locvars:

        .cfi_startproc

        #; alocate space for local vars

        sub     $0x1234,%esp

        .cfi_adjust_cfa_offset  0x1234

        #; dummy body

        movl    $1,%eax

        #; release space of local vars and return

        add     $0x1234,%esp

        .cfi_adjust_cfa_offset  -0x1234

        ret

        .cfi_endproc

#; func_prologue

#; - functions that begins with standard

#;   prologue: "pushq %rbp; movq %rsp,%rbp"

        .type   func_prologue,@function

func_prologue:

        .cfi_startproc

        #; prologue, CFI is valid after 

        #; each instruction.

        pushl   %ebp

        .cfi_def_cfa_offset     8

        .cfi_offset             ebp,-8

        movl    %esp, %ebp

        .cfi_def_cfa_register   ebp

        #; function body

        call    func_locvars

        addl    $3, %eax

        #; epilogue with valid CFI

        #; (we're better than gcc :-)

        leave

        .cfi_def_cfa_register   esp

        ret

        .cfi_endproc

#; func_otherreg

#; - function that moves frame pointer to 

#;   another register (ebx) and then allocates 

#;   a space for local variables

        .type   func_otherreg,@function

func_otherreg:

        .cfi_startproc

        #; save frame pointer to ebx

        mov     %esp,%ebx

        .cfi_def_cfa_register   ebx

        #; alocate space for local vars

        #;  (no .cfi_{def,adjust}_cfa_offset here,

        #;   because CFA is computed from ebx!)

        sub     $100,%esp

        #; function body

        call    func_prologue

        add     $2, %eax

        #; restore frame pointer from ebx

        mov     %ebx,%esp

        .cfi_def_cfa            esp,4

        ret

        .cfi_endproc

#; main

#; - typical function

        .type   main,@function

main:

        .cfi_startproc

        #; only function body that doesn't

        #; touch the stack at all.

        call    func_otherreg

        #; return

        ret

        .cfi_endproc

#; _start

#; - standard entry point

        .type   _start,@function

        .globl  _start

_start:

        .cfi_startproc

        call    main

        movl    %eax,%edi

        movl    $0x1,%eax

        int     $0x80

        hlt

        .cfi_endproc

#; func_all_registers

#; - test for all .cfi register numbers. 

#;   This function is never called and the CFI info doesn't make sense.

        .type   func_all_registers,@function

func_all_registers:

        .cfi_startproc simple

        .cfi_undefined eip      ; nop

        .cfi_undefined eax      ; nop

        .cfi_undefined ecx      ; nop

        .cfi_undefined edx      ; nop

        .cfi_undefined ebx      ; nop

        .cfi_undefined esp      ; nop

        .cfi_undefined ebp      ; nop

        .cfi_undefined esi      ; nop

        .cfi_undefined edi      ; nop

        .cfi_undefined eflags   ; nop

        .cfi_undefined es       ; nop

        .cfi_undefined cs       ; nop

        .cfi_undefined ds       ; nop

        .cfi_undefined ss       ; nop

        .cfi_undefined fs       ; nop

        .cfi_undefined gs       ; nop

        .cfi_undefined tr       ; nop

        .cfi_undefined ldtr     ; nop

        .cfi_undefined mxcsr    ; nop

        .cfi_undefined xmm0     ; nop

        .cfi_undefined xmm1     ; nop

        .cfi_undefined xmm2     ; nop

        .cfi_undefined xmm3     ; nop

        .cfi_undefined xmm4     ; nop

        .cfi_undefined xmm5     ; nop

        .cfi_undefined xmm6     ; nop

        .cfi_undefined xmm7     ; nop

        .cfi_undefined fcw      ; nop

        .cfi_undefined fsw      ; nop

        .cfi_undefined st       ; nop

        .cfi_undefined st(1)    ; nop

        .cfi_undefined st(2)    ; nop

        .cfi_undefined st(3)    ; nop

        .cfi_undefined st(4)    ; nop

        .cfi_undefined st(5)    ; nop

        .cfi_undefined st(6)    ; nop

        .cfi_undefined st(7)    ; nop

        .cfi_undefined mm0      ; nop

        .cfi_undefined mm1      ; nop

        .cfi_undefined mm2      ; nop

        .cfi_undefined mm3      ; nop

        .cfi_undefined mm4      ; nop

        .cfi_undefined mm5      ; nop

        .cfi_undefined mm6      ; nop

        .cfi_undefined mm7      ; nop

        .cfi_undefined ymm0     ; nop

        .cfi_undefined ymm1     ; nop

        .cfi_undefined ymm2     ; nop

        .cfi_undefined ymm3     ; nop

        .cfi_undefined ymm4     ; nop

        .cfi_undefined ymm5     ; nop

        .cfi_undefined ymm6     ; nop

        .cfi_undefined ymm7     ; nop

        .cfi_endproc