call frames

[Michal Ludvig]

Hi all,
I met a following problem while fixing gdb to pass gdb.asm testsuite on 
x86-64: When building a backtrace I depend on Dwarf-2 informations from 
.debug_frame or .eh_frame. Unfortunately hand-written assembler sources 
usually don't provide these sections and thus I can't do backtrace the 
standard way. Now what to do?

Should I have a fall-back FDE for functions that don't provide their own 
one and try to use it, assuming the function has a valid prologue (eg. 
push %rbp; mov %rbp,%rsp)? This seems to be quite a reasonable solution.

Another way would be disabling these tests in testsuite/gdb.asm for 
x86-64 paltform ;-)

Comments?

Michal Ludvig
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