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| author | Paul Mackerras <paulus@samba.org> | 2005-11-14 21:55:15 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2005-11-15 11:11:32 +1100 |
| commit | cc657f53928997c65bf2409c45166c6ceee8d306 (patch) | |
| tree | 247e16076381a947b4305bb6467acde1189f3918 /arch/powerpc/kernel/signal_64.c | |
| parent | 493f25ef4087395891c99fcfe2c72e62e293e89f (diff) | |
| download | lwn-cc657f53928997c65bf2409c45166c6ceee8d306.tar.gz lwn-cc657f53928997c65bf2409c45166c6ceee8d306.zip | |
powerpc: Fix clearing of the FPSCR when invoking a signal handler
As pointed out by Gary Byers, we were clearing the image of the FPSCR
(floating point status and control register) in the thread_struct before
copying it to the user stack when invoking a signal. Thus the task
would see its FPSCR getting cleared when it took a signal.
While fixing it I noticed that our swapcontext system call was also
clearing FPSCR. It shouldn't, so I fixed that too.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/signal_64.c')
| -rw-r--r-- | arch/powerpc/kernel/signal_64.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c index 58194e150711..1decf2785530 100644 --- a/arch/powerpc/kernel/signal_64.c +++ b/arch/powerpc/kernel/signal_64.c @@ -131,9 +131,6 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, flush_fp_to_thread(current); - /* Make sure signal doesn't get spurrious FP exceptions */ - current->thread.fpscr.val = 0; - #ifdef CONFIG_ALTIVEC err |= __put_user(v_regs, &sc->v_regs); @@ -423,6 +420,9 @@ static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info, if (err) goto badframe; + /* Make sure signal handler doesn't get spurious FP exceptions */ + current->thread.fpscr.val = 0; + /* Set up to return from userspace. */ if (vdso64_rt_sigtramp && current->thread.vdso_base) { regs->link = current->thread.vdso_base + vdso64_rt_sigtramp; |