CVS commit: src

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Thu Apr  4 00:46:42 UTC 2024

Modified Files:
        src/lib/libc/arch/i386/gen: setjmp.S sigsetjmp.S
        src/tests/lib/libc/setjmp: t_sigstack.c

Log Message:
i386 longjmp: Restore stack first, then signal mask.

Otherwise, a pending signal may be delivered on the wrong stack when
we restore the signal mask.

While here:

- Tidy the code a little bit.
- Sprinkle comments to explain what's going on.
- Use forward branches for statically predicted not-taken.
  => val==0 is unlikely in longjmp

PR lib/57946


To generate a diff of this commit:
cvs rdiff -u -r1.17 -r1.18 src/lib/libc/arch/i386/gen/setjmp.S
cvs rdiff -u -r1.18 -r1.19 src/lib/libc/arch/i386/gen/sigsetjmp.S
cvs rdiff -u -r1.8 -r1.9 src/tests/lib/libc/setjmp/t_sigstack.c

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