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>
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index b463d48..878fbdd 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -967,6 +967,20 @@
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)
{
perf_irq(regs);
@@ -1099,6 +1113,21 @@
}
#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 */
+
#ifdef CONFIG_FSL_BOOKE
void CacheLockingException(struct pt_regs *regs, unsigned long address,
unsigned long error_code)