CVS commit: src/lib/libc/arch/x86_64

["Kamil Rytarowski" <kamil%netbsd.org@localhost>]

Module Name:    src
Committed By:   kamil
Date:           Mon Oct 12 17:55:54 UTC 2020

Modified Files:
        src/lib/libc/arch/x86_64: Makefile.inc
        src/lib/libc/arch/x86_64/sys: __sigtramp2.S
Added Files:
        src/lib/libc/arch/x86_64: genassym.cf

Log Message:
Decorate the x86_64 signal trampoline with CFI attributes easing unwinding

Combine the approach provided by Nikhil Benesch and Andrew Cagney.

Now, the unwinders (in gccgo, backtrace(3), etc) can unwind properly
the stack from a signal handler.

Fixes lib/55719 by Nikhil Benesch


To generate a diff of this commit:
cvs rdiff -u -r1.6 -r1.7 src/lib/libc/arch/x86_64/Makefile.inc
cvs rdiff -u -r0 -r1.1 src/lib/libc/arch/x86_64/genassym.cf
cvs rdiff -u -r1.7 -r1.8 src/lib/libc/arch/x86_64/sys/__sigtramp2.S

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.