CVS commit: src/tests/kernel

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

Module Name:    src
Committed By:   riastradh
Date:           Thu Apr 24 17:00:25 UTC 2025

Modified Files:
        src/tests/kernel: t_signal_and_sp.c

Log Message:
t_signal_and_sp: contextsplink test may not be broken on n64.

n32 and n64 have the same stack alignment requirement (16-byte), so
if there were a problem it would probably manifest on n32 too.  But
the only things that __resumecontext does with a misaligned sp are:

1. syscall getcontext (not even via the syscall stub, but via the
   syscall instruction directly), which is unlikely to care; and

2. tail-call setcontext, which does a syscall (again, unlikely to
   care) that will discard the caller's sp and replace it altogether.

So I'm not sure we can even test potential adverse consequences of
misalignment inside __resumecontext, short of interposing our own
setcontext symbol to artificially verify its stack alignment before
passing on to the syscall -- which, while feasible, is maybe not
worth the effort.

PR kern/59327: user stack pointer is not aligned properly


To generate a diff of this commit:
cvs rdiff -u -r1.11 -r1.12 src/tests/kernel/t_signal_and_sp.c

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