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* dcrt0.cc (dll_crt0_1): Add a symbol denoting return from call to main().

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* exceptions.cc (stack_info::walk): Stop walking the stack when we hit
_cygwin_exit_return rather than just blindly stopping when PC becomes zero.
This commit is contained in:
Christopher Faylor
2008-08-01 19:12:49 +00:00
parent 3462d736b6
commit b23b171641
3 changed files with 18 additions and 3 deletions
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8
winsup/cygwin/ChangeLog
View File

@@ -1,3 +1,11 @@
2008-08-01 Christopher Faylor <me+cygwin@cgf.cx>
* dcrt0.cc (dll_crt0_1): Add a symbol denoting return from call to
main().
* exceptions.cc (stack_info::walk): Stop walking the stack when we
hit _cygwin_exit_return rather than just blindly stopping when PC
becomes zero.
2008-07-31 Corinna Vinschen <corinna@vinschen.de>
* path.cc (symlink_info::check): Handle (and explain) a special case

4
winsup/cygwin/dcrt0.cc
View File

@@ -933,6 +933,10 @@ dll_crt0_1 (void *)
ld_preload ();
if (user_data->main)
cygwin_exit (user_data->main (__argc, __argv, *user_data->envptr));
__asm__ (" \n\
.global __cygwin_exit_return \n\
__cygwin_exit_return: \n\
");
}
extern "C" void __stdcall

9
winsup/cygwin/exceptions.cc
View File

@@ -243,21 +243,24 @@ stack_info::init (DWORD ebp, bool wantargs, bool goodframe)
# undef debp
}
extern "C" void _cygwin_exit_return ();
/* Walk the stack by looking at successive stored 'bp' frames.
This is not foolproof. */
int
stack_info::walk ()
{
char **ebp;
if ((void (*) ()) sf.AddrPC.Offset == _cygwin_exit_return)
return 0; /* stack frames are exhausted */
if (((ebp = (char **) next_offset ()) == NULL) || (ebp >= (char **) cygwin_hmodule))
return 0;
sf.AddrFrame.Offset = (DWORD) ebp;
sf.AddrPC.Offset = sf.AddrReturn.Offset;
if (!sf.AddrPC.Offset)
return 0; /* stack frames are exhausted */
/* The return address always follows the stack pointer */
sf.AddrReturn.Offset = (DWORD) *++ebp;