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/include/asm-powerpc/ptrace.h b/include/asm-powerpc/ptrace.h
index 38d87e5..3d6e310 100644
--- a/include/asm-powerpc/ptrace.h
+++ b/include/asm-powerpc/ptrace.h
@@ -224,6 +224,14 @@
#define PT_VRSAVE_32 (PT_VR0 + 33*4)
#endif
+/*
+ * Only store first 32 VSRs here. The second 32 VSRs in VR0-31
+ */
+#define PT_VSR0 150 /* each VSR reg occupies 2 slots in 64-bit */
+#define PT_VSR31 (PT_VSR0 + 2*31)
+#ifdef __KERNEL__
+#define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */
+#endif
#endif /* __powerpc64__ */
/*
@@ -246,6 +254,10 @@
#define PTRACE_GETEVRREGS 20
#define PTRACE_SETEVRREGS 21
+/* Get the first 32 128bit VSX registers */
+#define PTRACE_GETVSRREGS 27
+#define PTRACE_SETVSRREGS 28
+
/*
* Get or set a debug register. The first 16 are DABR registers and the
* second 16 are IABR registers.