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/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 70fbde8..4e203a8 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -350,6 +350,51 @@
}
#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 @@
#ifdef CONFIG_ALTIVEC
REGSET_VMX,
#endif
+#ifdef CONFIG_VSX
+ REGSET_VSX,
+#endif
#ifdef CONFIG_SPE
REGSET_SPE,
#endif
@@ -449,6 +497,13 @@
.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 @@
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. */