powerpc/signal: Add unsafe_copy_{vsx, fpr}_from_user()

Reuse the "safe" implementation from signal.c but call unsafe_get_user()
directly in a loop to avoid the intermediate copy into a local buffer.

Signed-off-by: Christopher M. Riedl <cmr@codefail.de>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210227011259.11992-3-cmr@codefail.de

diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h
index 2559a681536eaa2a4bb739ab42a5bc45e9e3abb4..d8dd76b1dc9404a401749ba4b0e205d3154396fc 100644 (file)
--- a/arch/powerpc/kernel/signal.h
+++ b/arch/powerpc/kernel/signal.h
@@ -53,6 +53,26 @@ unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from);
                                &buf[i], label);\
 } while (0)
 
+#define unsafe_copy_fpr_from_user(task, from, label)   do {            \
+       struct task_struct *__t = task;                                 \
+       u64 __user *buf = (u64 __user *)from;                           \
+       int i;                                                          \
+                                                                       \
+       for (i = 0; i < ELF_NFPREG - 1; i++)                            \
+               unsafe_get_user(__t->thread.TS_FPR(i), &buf[i], label); \
+       unsafe_get_user(__t->thread.fp_state.fpscr, &buf[i], label);    \
+} while (0)
+
+#define unsafe_copy_vsx_from_user(task, from, label)   do {            \
+       struct task_struct *__t = task;                                 \
+       u64 __user *buf = (u64 __user *)from;                           \
+       int i;                                                          \
+                                                                       \
+       for (i = 0; i < ELF_NVSRHALFREG ; i++)                          \
+               unsafe_get_user(__t->thread.fp_state.fpr[i][TS_VSRLOWOFFSET], \
+                               &buf[i], label);                        \
+} while (0)
+
 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 #define unsafe_copy_ckfpr_to_user(to, task, label)     do {            \
        struct task_struct *__t = task;                                 \
@@ -80,6 +100,10 @@ unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from);
        unsafe_copy_to_user(to, (task)->thread.fp_state.fpr,    \
                            ELF_NFPREG * sizeof(double), label)
 
+#define unsafe_copy_fpr_from_user(task, from, label)                   \
+       unsafe_copy_from_user((task)->thread.fp_state.fpr, from,        \
+                           ELF_NFPREG * sizeof(double), label)
+
 static inline unsigned long
 copy_fpr_to_user(void __user *to, struct task_struct *task)
 {
@@ -115,6 +139,8 @@ copy_ckfpr_from_user(struct task_struct *task, void __user *from)
 #else
 #define unsafe_copy_fpr_to_user(to, task, label) do { } while (0)
 
+#define unsafe_copy_fpr_from_user(task, from, label) do { } while (0)
+
 static inline unsigned long
 copy_fpr_to_user(void __user *to, struct task_struct *task)
 {