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Support multiple .eh_frame sections

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This patch is based on MULTIPLE_FRAME_SECTIONS and EH_FRAME_LINKONCE,
	it allows backend to enable this feature and use '--gc-sections' simply.

	* gas/dw2gencfi.h (TARGET_MULTIPLE_EH_FRAME_SECTIONS): New.
	(MULTIPLE_FRAME_SECTIONS): Add TARGET_MULTIPLE_EH_FRAME_SECTIONS.
	* gas/dw2gencfi.c (EH_FRAME_LINKONCE): Add TARGET_MULTIPLE_EH_FRAME_SECTIONS.
	(is_now_linkonce_segment): Likewise.
	(get_cfi_seg): Create relocation info between .eh_frame.* and .text.* section.

	* bfd/elf-bfd.h (elf_backend_can_make_multiple_eh_frame): New.
	* bfd/elfxx-target.h (elf_backend_can_make_multiple_eh_frame): Likewise.
	* bfd/elflink.c (_bfd_elf_default_action_discarded): Add checking for
	elf_backend_can_make_multiple_eh_frame.
This commit is contained in:
Jojo R
2022-07-14 00:28:09 +08:00
parent a494349e80
commit 853ba67882
6 changed files with 49 additions and 3 deletions
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4
gas/doc/internals.texi
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@ -1581,6 +1581,10 @@ If defined, GAS will check this macro before performing any optimizations on
the DWARF call frame debug information that is emitted. Targets which
implement link time relaxation may need to define this macro and set it to zero
if it is possible to change the size of a function's prologue.
@item TARGET_MULTIPLE_EH_FRAME_SECTIONS
If defined, GAS will create multiple .eh_frame.* sections according to
the name of owner's function sections.
@end table
@node Object format backend