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.text
#; func_locvars
#; - function with a space on the stack
#; allocated for local variables
func_locvars:
.cfi_startproc
#; alocate space for local vars
sub $0x1234,%rsp
.cfi_adjust_cfa_offset 0x1234
#; dummy body
movl $1,%eax
#; release space of local vars and return
add $0x1234,%rsp
.cfi_adjust_cfa_offset -0x1234
ret
.cfi_endproc
#; func_prologue
#; - functions that begins with standard
#; prologue: "pushq %rbp; movq %rsp,%rbp"
func_prologue:
.cfi_startproc
#; prologue, CFI is valid after
#; each instruction.
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset %rbp, -16
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
#; function body
call func_locvars
addl $3, %eax
#; epilogue with valid CFI
#; (we're better than gcc :-)
leaveq
.cfi_def_cfa %rsp, 8
ret
.cfi_endproc
#; func_otherreg
#; - function that moves frame pointer to
#; another register (r12) and then allocates
#; a space for local variables
func_otherreg:
.cfi_startproc
#; save frame pointer to r8
movq %rsp,%r8
.cfi_def_cfa_register r8
#; alocate space for local vars
#; (no .cfi_{def,adjust}_cfa_offset here,
#; because CFA is computed from r8!)
sub $100,%rsp
#; function body
call func_prologue
addl $2, %eax
#; restore frame pointer from r8
movq %r8,%rsp
.cfi_def_cfa_register rsp
ret
.cfi_endproc
#; main
#; - typical 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
.globl _start
_start:
.cfi_startproc
call main
movq %rax,%rdi
movq $0x3c,%rax
syscall
hlt
.cfi_endproc
#; func_alldirectives
#; - test for all .cfi directives.
#; This function is never called and the CFI info doesn't make sense.
func_alldirectives:
.cfi_startproc simple
.cfi_def_cfa rsp,8
nop
.cfi_def_cfa_offset 16
nop
.cfi_def_cfa_register r8
nop
.cfi_adjust_cfa_offset 0x1234
nop
.cfi_offset %rsi, 0x10
nop
.cfi_register %r8, %r9
nop
.cfi_remember_state
nop
.cfi_restore %rbp
nop
.cfi_undefined %rip
nop
.cfi_same_value rbx
nop
.cfi_restore_state
ret
.cfi_endproc
#; func_all_registers
#; - test for all .cfi register numbers.
#; This function is never called and the CFI info doesn't make sense.
func_all_registers:
.cfi_startproc simple
.cfi_undefined rip ; nop
.cfi_undefined rax ; nop
.cfi_undefined rcx ; nop
.cfi_undefined rdx ; nop
.cfi_undefined rbx ; nop
.cfi_undefined rsp ; nop
.cfi_undefined rbp ; nop
.cfi_undefined rsi ; nop
.cfi_undefined rdi ; nop
.cfi_undefined r8 ; nop
.cfi_undefined r9 ; nop
.cfi_undefined r10 ; nop
.cfi_undefined r11 ; nop
.cfi_undefined r12 ; nop
.cfi_undefined r13 ; nop
.cfi_undefined r14 ; nop
.cfi_undefined r15 ; nop
.cfi_undefined rflags ; 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 fs.base ; nop
.cfi_undefined gs.base ; 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 xmm8 ; nop
.cfi_undefined xmm9 ; nop
.cfi_undefined xmm10 ; nop
.cfi_undefined xmm11 ; nop
.cfi_undefined xmm12 ; nop
.cfi_undefined xmm13 ; nop
.cfi_undefined xmm14 ; nop
.cfi_undefined xmm15 ; 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 xmm16 ; nop
.cfi_undefined xmm17 ; nop
.cfi_undefined xmm18 ; nop
.cfi_undefined xmm19 ; nop
.cfi_undefined xmm20 ; nop
.cfi_undefined xmm21 ; nop
.cfi_undefined xmm22 ; nop
.cfi_undefined xmm23 ; nop
.cfi_undefined xmm24 ; nop
.cfi_undefined xmm25 ; nop
.cfi_undefined xmm26 ; nop
.cfi_undefined xmm27 ; nop
.cfi_undefined xmm28 ; nop
.cfi_undefined xmm29 ; nop
.cfi_undefined xmm30 ; nop
.cfi_undefined xmm31 ; nop
.cfi_undefined k0 ; nop
.cfi_undefined k1 ; nop
.cfi_undefined k2 ; nop
.cfi_undefined k3 ; nop
.cfi_undefined k4 ; nop
.cfi_undefined k5 ; nop
.cfi_undefined k6 ; nop
.cfi_undefined k7 ; nop
.cfi_endproc
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