Module Name: src
Committed By: riastradh
Date: Fri Feb 28 16:08:19 UTC 2025
Modified Files:
src/tests/kernel: Makefile t_execregs.c
src/tests/kernel/arch/hppa: execregs.c execregs.h h_execregs.S
Log Message:
t_execregs: Test some more registers on hppa.
Looks like we're missing zeroing of floating-point registers too, as
well as the carry/borrow and divide step correction bits in the
semi-secret PSW register.
Unfortunately, while investigating this, I discovered that qemu's
hppa implementation doesn't implement fpu traps even if the fpu is
disabled (relevant bits of CR 10 `CCR', Coprocessor Control Register,
are cleared), which breaks fpu switching on NetBSD. So I can't test
properly this myself. We should maybe just change NetBSD from lazy
fpu switching to eager fpu switching anyway to thwart Spectre-class
attacks if there's any hppa hardware out there that does speculative
execution.
PR kern/59084: exec/spawn leaks register content
To generate a diff of this commit:
cvs rdiff -u -r1.85 -r1.86 src/tests/kernel/Makefile
cvs rdiff -u -r1.1 -r1.2 src/tests/kernel/t_execregs.c
cvs rdiff -u -r1.1 -r1.2 src/tests/kernel/arch/hppa/execregs.c \
src/tests/kernel/arch/hppa/execregs.h \
src/tests/kernel/arch/hppa/h_execregs.S
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
