On 12/20/2011 03:07 PM, Ian Lance Taylor wrote: > __morestack_non_split: > + .cfi_startproc > > #ifndef __x86_64__ > - addl $0x4000,4(%esp) > + > + # See below for an extended explanation of the CFI instructions. > + .cfi_offset 8, 8 # New PC stored at CFA + 8 > + .cfi_escape 0x15, 4, 0x7d # DW_CFA_val_offset_sf, %esp, 12/-4 > + # i.e., next %esp is CFA + 12 > + > + pushl %eax # Save %eax in case it is a parameter. > + > + .cfi_def_cfa %esp,8 # Account for pushed register. > + > + movl %esp,%eax # Current stack,
You'd be better off leaving the CFA where it belongs, at the desired location of esp after unwind, i.e. esp+12. That way you don't need to adjust the default location of the return register, nor use a .cfi_escape. Begin with ".cfi_def_cfa esp, 12" and that's about it. Except for the fact you need to alter your push/pop adjustments. Those almost certainly should use .cfi_adjust_cfa_offset instead of explicit absolute adjustments. r~
