linux-kernel - [PATCH 03/10] powerpc/signal: Add unsafe_copy_ck{fpr/vsx}_from

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Message-Id: <1040687aa27553d19f749f7fb48f0c07af98ee2d.1616151715.git.christophe.leroy@csgroup.eu>
Date:   Fri, 19 Mar 2021 11:06:52 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, cmr@...efail.de
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 03/10] powerpc/signal: Add unsafe_copy_ck{fpr/vsx}_from_user

Add unsafe_copy_ckfpr_from_user() and unsafe_copy_ckvsx_from_user()

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/kernel/signal.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h
index 1393876f3814..a5152ff3c52f 100644
--- a/arch/powerpc/kernel/signal.h
+++ b/arch/powerpc/kernel/signal.h
@@ -100,6 +100,26 @@ unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from);
 		unsafe_put_user(__t->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET], \
 				&buf[i], label);\
 } while (0)
+
+#define unsafe_copy_ckfpr_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_CKFPR(i), &buf[i], label);\
+	unsafe_get_user(__t->thread.ckfp_state.fpscr, &buf[i], failed);	\
+} while (0)
+
+#define unsafe_copy_ckvsx_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.ckfp_state.fpr[i][TS_VSRLOWOFFSET], \
+				&buf[i], label);			\
+} while (0)
 #endif
 #elif defined(CONFIG_PPC_FPU_REGS)
 
-- 
2.25.0