[patch ld bfd gas]: Handle linkonce for cfi generated debug_frame and eh_frame data

[Kai Tietz]

2011/4/18 Kai Tietz <ktietz70@googlemail.com>:
> 2011/4/18 H.J. Lu <hjl.tools@gmail.com>:
>> On Mon, Apr 18, 2011 at 2:33 AM, Kai Tietz <ktietz70@googlemail.com> wrote:
>>> Hello,
>>>
>>> The recent patch about this subject I withdraw and replace it by the
>>> more enhanced version.  I noticed that a bit more checkings and a
>>> different approach on writing eh_frame/debug_frame sections out, was
>>> necessary.  Additionally this patch allows for PE-COFF targets, that
>>> debugging sections can have link-once flags active.
>>>
>>>
>>> ChangeLog bfd/
>>>
>>> 2011-04-18  Kai Tietz
>>>
>>>        * coffcode.h (sec_to_styp_flags): Allow linkonce for
>>>        debugging sections.
>>>
>>> ChangeLog gas/
>>>
>>> 2011-04-18  Kai Tietz
>>>
>>>       * dw2gencfi.c (dwcfi_seg_list): New struct.
>>>       (dwcfi_hash): New static hash variable.
>>>       (get_debugseg_name): New.
>>>       (alloc_debugseg_item): New.
>>>       (make_debug_seg): New.
>>>       (dwcfi_hash_insert): New.
>>>       (dwcfi_hash_find): New.
>>>       (dwcfi_hash_find_or_make): New.
>>>       (cfi_insn_data): New member cur_seg.
>>>       (cie_entry): Likewise.
>>>       (fde_entry): New cseg and handled members.
>>>       (alloc_fde_entry): Initialize cseg member.
>>>       (alloc_cfi_insn_data): Initialize cur_seg member.
>>>       (dot_cfi_sections): Compare for beginning of
>>>       section names via strncmp.
>>>       (get_cfi_seg): New.
>>>       (cfi_finish): Treat link-once sections.
>>>       (is_now_linkonce_segment): New local helper.
>>>       (output_cie): Ignore cie entries not member of current
>>>       segment.
>>>       (output_fde): Likewise.
>>>       (select_cie_for_fde): Likewise.
>>>       (cfi_change_reg_numbers): Add new argument for current segment
>>>       and ignore insn elements, if not part of current segment.
>>>       * ehopt.c (get_cie_info): Use strncmp for
>>>       section name matching.
>>>       (heck_eh_frame): Likewise.
>>>
>>> ChangeLog ld/
>>>
>>> 2011-04-18  Kai Tietz
>>>
>>>       * scripttempl/alphavms.sc: Handle .eh_frame($|.)* sections.
>>>       * scripttempl/armbpabi.sc: Likewise.
>>>       * scripttempl/avr.sc: Likewise.
>>>       * scripttempl/crisaout.sc: Likewise.
>>>       * scripttempl/elf.sc: Likewise.
>>>       * scripttempl/elf32cr16.sc: Likewise.
>>>       * scripttempl/elf32crx.sc: Likewise.
>>>       * scripttempl/elf32msp430.sc: Likewise.
>>>       * scripttempl/elf32msp430_3.sc: Likewise.
>>>       * scripttempl/elf32sh-symbian.sc: Likewise.
>>>       * scripttempl/elf64hppa.sc: Likewise.
>>>       * scripttempl/elf_chaos.sc: Likewise.
>>>       * scripttempl/elfd10v.sc: Likewise.
>>>       * scripttempl/elfd30v.sc: Likewise.
>>>       * scripttempl/elfi370.sc: Likewise.
>>>       * scripttempl/elfm68hc11.sc: Likewise.
>>>       * scripttempl/elfm68hc12.sc: Likewise.
>>>       * scripttempl/elfmicroblaze.sc: Likewise.
>>>       * scripttempl/elfxtensa.sc: Likewise.
>>>       * scripttempl/epocpe.sc: Likewise.
>>>       * scripttempl/i386beos.sc: Likewise.
>>>       * scripttempl/i386go32.sc: Likewise.
>>>       * scripttempl/ip2k.sc: Likewise.
>>>       * scripttempl/iq2000.sc: Likewise.
>>>       * scripttempl/mcorepe.sc: Likewise.
>>>       * scripttempl/mep.sc: Likewise.
>>>       * scripttempl/mmo.sc: Likewise.
>>>       * scripttempl/pe.sc: Likewise.
>>>       * scripttempl/pep.sc: Likewise.
>>>       * scripttempl/v850.sc: Likewise.
>>>       * scripttempl/xstormy16.sc: Likewise.
>>>
>>> Tested for x86_64-w64-mingw32, i686-w64-mingw32, and i686-pc-cygwin.
>>> Ok for apply?
>>
>> 2 comments:
>>
>> 1. You should test Linux/x86 since you change ELF targets.
>> 2. You should add some testcases to show gas/ld work correctly.
>>
>>
>> --
>> H.J.
>>
>
> I tested things for x86_64-pc-linux-gnu and found that the linkonce
> code collides with eh_frame_hdr code in bfd. So I removed complete ELF
> handling here and just enable cfi linkonce handling for PE-COFF
> targets.
>
> ChangeLog bfd/
>
> 2011-04-18  Kai Tietz
>
>        * coffcode.h (sec_to_styp_flags): Allow linkonce for
>        debugging sections.
>
> ChangeLog gas/
>
> 2011-04-18  Kai Tietz
>
>       * dw2gencfi.c (dwcfi_seg_list): New struct.
>       (dwcfi_hash): New static hash variable.
>       (get_debugseg_name): New.
>       (alloc_debugseg_item): New.
>       (make_debug_seg): New.
>       (dwcfi_hash_insert): New.
>       (dwcfi_hash_find): New.
>       (dwcfi_hash_find_or_make): New.
>       (cfi_insn_data): New member cur_seg.
>       (cie_entry): Likewise.
>       (fde_entry): New cseg and handled members.
>       (alloc_fde_entry): Initialize cseg member.
>       (alloc_cfi_insn_data): Initialize cur_seg member.
>       (dot_cfi_sections): Compare for beginning of
>       section names via strncmp.
>       (get_cfi_seg): New.
>       (cfi_finish): Treat link-once sections.
>       (is_now_linkonce_segment): New local helper.
>       (output_cie): Ignore cie entries not member of current
>       segment.
>       (output_fde): Likewise.
>       (select_cie_for_fde): Likewise.
>       (cfi_change_reg_numbers): Add new argument for current segment
>       and ignore insn elements, if not part of current segment.
>       * ehopt.c (get_cie_info): Use strncmp for
>       section name matching.
>       (heck_eh_frame): Likewise.
>
> ChangeLog ld/
>
> 2011-04-18  Kai Tietz
>
>       * scripttempl/pe.sc: Likewise.
>       * scripttempl/pep.sc: Likewise.
>
> ChangeLog ld/testsuite/
>
> 2011-04-18  Kai Tietz
>
>        * ld-pe/pe.exp: Add cfi/cfi32 tests.
>        * ld-pe/cfi.d: New.
>        * ld-pe/cfi32.d: New.
>        * ld-pe/cfia.s: New.
>        * ld-pe/cfib.s: New.
>
> I added a testcase for pe and pe+ and regression tested it for
> i686-w64-mingw32, i686-pc-cygwin, x86_64-w64-mingw32, and
> x86_64-pc-linux-gnu. Ok for apply?
>
> Regards,
> Kai
>

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