path: root/arch/powerpc/kernel/traps.c
diff options
authorMichael Neuling <mikey@neuling.org>2008-06-25 14:07:18 +1000
committerPaul Mackerras <paulus@samba.org>2008-07-01 11:28:50 +1000
commitce48b2100785e5ca629fb3aa8e3b50aca808f692 (patch)
tree63532ff7cc68b18ca4902bd10e03fcbaaf01cade /arch/powerpc/kernel/traps.c
parent72ffff5b1792b0fa4d40a8e2f3276fff999820ec (diff)
powerpc: Add VSX context save/restore, ptrace and signal support
This patch extends the floating point save and restore code to use the VSX load/stores when VSX is available. This will make FP context save/restore marginally slower on FP only code, when VSX is available, as it has to load/store 128bits rather than just 64bits. Mixing FP, VMX and VSX code will get constant architected state. The signals interface is extended to enable access to VSR 0-31 doubleword 1 after discussions with tool chain maintainers. Backward compatibility is maintained. The ptrace interface is also extended to allow access to VSR 0-31 full registers. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/traps.c')
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index b463d48145a..878fbddb6ae 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -967,6 +967,20 @@ void altivec_unavailable_exception(struct pt_regs *regs)
die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);
+void vsx_unavailable_exception(struct pt_regs *regs)
+ if (user_mode(regs)) {
+ /* A user program has executed an vsx instruction,
+ but this kernel doesn't support vsx. */
+ _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
+ return;
+ }
+ printk(KERN_EMERG "Unrecoverable VSX Unavailable Exception "
+ "%lx at %lx\n", regs->trap, regs->nip);
+ die("Unrecoverable VSX Unavailable Exception", regs, SIGABRT);
void performance_monitor_exception(struct pt_regs *regs)
@@ -1099,6 +1113,21 @@ void altivec_assist_exception(struct pt_regs *regs)
#endif /* CONFIG_ALTIVEC */
+#ifdef CONFIG_VSX
+void vsx_assist_exception(struct pt_regs *regs)
+ if (!user_mode(regs)) {
+ printk(KERN_EMERG "VSX assist exception in kernel mode"
+ " at %lx\n", regs->nip);
+ die("Kernel VSX assist exception", regs, SIGILL);
+ }
+ flush_vsx_to_thread(current);
+ printk(KERN_INFO "VSX assist not supported at %lx\n", regs->nip);
+ _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
+#endif /* CONFIG_VSX */
void CacheLockingException(struct pt_regs *regs, unsigned long address,
unsigned long error_code)