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bfd: linker: merge .sframe sections

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The linker merges all the input .sframe sections.  When merging, the
linker verifies that all the input .sframe sections have the same
abi/arch.

The linker uses libsframe library to perform key actions on the
.sframe sections - decode, read, and create output data.  This
implies buildsystem changes to make and install libsframe before
libbfd.

The linker places the output .sframe section in a new segment of its
own: PT_GNU_SFRAME.  A new segment is not added, however, if the
generated .sframe section is empty.

When a section is discarded from the final link, the corresponding
entries in the .sframe section for those functions are also deleted.

The linker sorts the SFrame FDEs on start address by default and sets
the SFRAME_F_FDE_SORTED flag in the .sframe section.

This patch also adds support for generation of SFrame unwind
information for the .plt* sections on x86_64.  SFrame unwind info is
generated for IBT enabled PLT, lazy/non-lazy PLT.

The existing linker option --no-ld-generated-unwind-info has been
adapted to include the control of whether .sframe unwind information
will be generated for the linker generated sections like PLT.

Changes to the linker script have been made as necessary.

ChangeLog:

	* Makefile.def: Add install dependency on libsframe for libbfd.
	* Makefile.in: Regenerated.
This commit is contained in:
Indu Bhagat 2022-11-15 15:07:04 -08:00 • committed by Arsen Arsenović
parent dc17ceb305
commit dab58c9363
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2 changed files with 15 additions and 0 deletions
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4
Makefile.def
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@ -459,11 +459,14 @@ dependencies = { module=all-gdbsupport; on=all-gnulib; };
dependencies = { module=all-gdbsupport; on=all-intl; };
// Host modules specific to binutils.
// build libsframe before bfd for encoder/decoder support for linking
// SFrame sections
dependencies = { module=configure-bfd; on=configure-libiberty; hard=true; };
dependencies = { module=configure-bfd; on=configure-intl; };
dependencies = { module=all-bfd; on=all-libiberty; };
dependencies = { module=all-bfd; on=all-intl; };
dependencies = { module=all-bfd; on=all-zlib; };
dependencies = { module=all-bfd; on=all-libsframe; };
dependencies = { module=configure-opcodes; on=configure-libiberty; hard=true; };
dependencies = { module=all-opcodes; on=all-libiberty; };
@ -489,6 +492,7 @@ dependencies = { module=install-binutils; on=install-opcodes; };
dependencies = { module=install-strip-binutils; on=install-strip-opcodes; };
// Likewise for ld, libctf, and bfd.
dependencies = { module=install-bfd; on=install-libsframe; };
dependencies = { module=install-libctf; on=install-bfd; };
dependencies = { module=install-ld; on=install-bfd; };
dependencies = { module=install-ld; on=install-libctf; };

11
Makefile.in
View file

@ -66354,6 +66354,16 @@ all-stagetrain-bfd: maybe-all-stagetrain-zlib
all-stagefeedback-bfd: maybe-all-stagefeedback-zlib
all-stageautoprofile-bfd: maybe-all-stageautoprofile-zlib
all-stageautofeedback-bfd: maybe-all-stageautofeedback-zlib
all-bfd: maybe-all-libsframe
all-stage1-bfd: maybe-all-stage1-libsframe
all-stage2-bfd: maybe-all-stage2-libsframe
all-stage3-bfd: maybe-all-stage3-libsframe
all-stage4-bfd: maybe-all-stage4-libsframe
all-stageprofile-bfd: maybe-all-stageprofile-libsframe
all-stagetrain-bfd: maybe-all-stagetrain-libsframe
all-stagefeedback-bfd: maybe-all-stagefeedback-libsframe
all-stageautoprofile-bfd: maybe-all-stageautoprofile-libsframe
all-stageautofeedback-bfd: maybe-all-stageautofeedback-libsframe
configure-opcodes: configure-libiberty
configure-stage1-opcodes: configure-stage1-libiberty
configure-stage2-opcodes: configure-stage2-libiberty
@ -66486,6 +66496,7 @@ all-stageautoprofile-binutils: maybe-all-stageautoprofile-libsframe
all-stageautofeedback-binutils: maybe-all-stageautofeedback-libsframe
install-binutils: maybe-install-opcodes
install-strip-binutils: maybe-install-strip-opcodes
install-bfd: maybe-install-libsframe
install-libctf: maybe-install-bfd
install-ld: maybe-install-bfd
install-ld: maybe-install-libctf