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>

1 files changed, 70 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 70fbde84b83f..4e203a89e189 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -350,6 +350,51 @@ static int vr_set(struct task_struct *target, const struct user_regset *regset,
 }
 #endif /* CONFIG_ALTIVEC */
 
+#ifdef CONFIG_VSX
+/*
+ * Currently to set and and get all the vsx state, you need to call
+ * the fp and VMX calls aswell.  This only get/sets the lower 32
+ * 128bit VSX registers.
+ */
+
+static int vsr_active(struct task_struct *target,
+                      const struct user_regset *regset)
+{
+        flush_vsx_to_thread(target);
+        return target->thread.used_vsr ? regset->n : 0;
+}
+
+static int vsr_get(struct task_struct *target, const struct user_regset *regset,
+                   unsigned int pos, unsigned int count,
+                   void *kbuf, void __user *ubuf)
+{
+        int ret;
+
+        flush_vsx_to_thread(target);
+
+        ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                  target->thread.fpr, 0,
+                                  32 * sizeof(vector128));
+
+        return ret;
+}
+
+static int vsr_set(struct task_struct *target, const struct user_regset *regset,
+                   unsigned int pos, unsigned int count,
+                   const void *kbuf, const void __user *ubuf)
+{
+        int ret;
+
+        flush_vsx_to_thread(target);
+
+        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                 target->thread.fpr, 0,
+                                 32 * sizeof(vector128));
+
+        return ret;
+}
+#endif /* CONFIG_VSX */
+
 #ifdef CONFIG_SPE
 
 /*
@@ -426,6 +471,9 @@ enum powerpc_regset {
 #ifdef CONFIG_ALTIVEC
         REGSET_VMX,
 #endif
+#ifdef CONFIG_VSX
+        REGSET_VSX,
+#endif
 #ifdef CONFIG_SPE
         REGSET_SPE,
 #endif
@@ -449,6 +497,13 @@ static const struct user_regset native_regsets[] = {
                 .active = vr_active, .get = vr_get, .set = vr_set
         },
 #endif
+#ifdef CONFIG_VSX
+        [REGSET_VSX] = {
+                .n = 32,
+                .size = sizeof(vector128), .align = sizeof(vector128),
+                .active = vsr_active, .get = vsr_get, .set = vsr_set
+        },
+#endif
 #ifdef CONFIG_SPE
         [REGSET_SPE] = {
                 .n = 35,
@@ -849,6 +904,21 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                                                  sizeof(u32)),
                                              (const void __user *) data);
 #endif
+#ifdef CONFIG_VSX
+        case PTRACE_GETVSRREGS:
+                return copy_regset_to_user(child, &user_ppc_native_view,
+                                           REGSET_VSX,
+                                           0, (32 * sizeof(vector128) +
+                                               sizeof(u32)),
+                                           (void __user *) data);
+
+        case PTRACE_SETVSRREGS:
+                return copy_regset_from_user(child, &user_ppc_native_view,
+                                             REGSET_VSX,
+                                             0, (32 * sizeof(vector128) +
+                                                 sizeof(u32)),
+                                             (const void __user *) data);
+#endif
 #ifdef CONFIG_SPE
         case PTRACE_GETEVRREGS:
                 /* Get the child spe register state. */