Re[2]: elf "note" section for win32-style thread context

[Egor Duda <deo@logos-m.ru>]

Hi!

May 10 1999 Ian Lance Taylor <ian@airs.com> wrote :

>>    I've got an intention to add core dumping functionality to cygwin
>>    library, so that cygwin application would write elf core file. As a
>>    part of it, there should be "note" sections to store contexts of all
>>    running threads. I see two possible ways to do it. I can either
>>    emulate through one of existing structures (prstatus_t, lwpstatus_t,
>>    etc.) or add new special note type for cygwin to bfd. Which way should
>>    i choose?

ILT> The real point of storing thread information in a core file is so that
ILT> you can examine the thread state using gdb.  So you should probably
ILT> make your decision based on what fits more naturally into the gdb
ILT> code.

Of  course.  Actually, I've tried a second way (the simple one) and it
appears  that it works perfectly without changing a single line in gdb
sources. The only code  i  need  to  add  is  function in bfd/elf.c to
recognize   this   particular  NT_WIN32CONTEXT  note type (yet another
elfcore_grok_ function). But i wasn't sure that simplest solution is a
best one :)

ILT> The prstatus_t stuff is all ELF specific, so you would have to copy it
ILT> anyhow for the PE-based cygwin code. The current implementation is
ILT> actually not quite right in that it relies on host header files, and
ILT> even if the right header files are available can not be built
ILT> correctly for a cross toolchain.

i'm  not sure why? you mean that my changes will make cygwin depend on
bfd?

Egor.            mailto:deo@logos-m.ru ICQ 5165414 FidoNet 2:5020/496.19