All of lore.kernel.org
 help / color / mirror / Atom feed
From: Christoph Hellwig <hch@lst.de>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-arch@vger.kernel.org
Subject: [PATCH 6/8] riscv: refactor __get_user and __put_user
Date: Mon,  7 Sep 2020 07:58:23 +0200	[thread overview]
Message-ID: <20200907055825.1917151-7-hch@lst.de> (raw)
In-Reply-To: <20200907055825.1917151-1-hch@lst.de>

Add new __get_user_nocheck and __put_user_nocheck that switch on the size
and call the actual inline assembly helpers, and move the uaccess enable
/ disable into the actual __get_user and __put_user.  This prepares for
natively implementing __get_kernel_nofault and __put_kernel_nofault.

Also don't bother with the deprecated register keyword for the error
return.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/riscv/include/asm/uaccess.h | 94 ++++++++++++++++++--------------
 1 file changed, 52 insertions(+), 42 deletions(-)

diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h
index e8eedf22e90747..b67d1c616ec348 100644
--- a/arch/riscv/include/asm/uaccess.h
+++ b/arch/riscv/include/asm/uaccess.h
@@ -107,7 +107,6 @@ static inline int __access_ok(unsigned long addr, unsigned long size)
 do {								\
 	uintptr_t __tmp;					\
 	__typeof__(x) __x;					\
-	__enable_user_access();					\
 	__asm__ __volatile__ (					\
 		"1:\n"						\
 		"	" insn " %1, %3\n"			\
@@ -125,7 +124,6 @@ do {								\
 		"	.previous"				\
 		: "+r" (err), "=&r" (__x), "=r" (__tmp)		\
 		: "m" (*(ptr)), "i" (-EFAULT));			\
-	__disable_user_access();				\
 	(x) = __x;						\
 } while (0)
 
@@ -138,7 +136,6 @@ do {								\
 	u32 __user *__ptr = (u32 __user *)(ptr);		\
 	u32 __lo, __hi;						\
 	uintptr_t __tmp;					\
-	__enable_user_access();					\
 	__asm__ __volatile__ (					\
 		"1:\n"						\
 		"	lw %1, %4\n"				\
@@ -162,12 +159,30 @@ do {								\
 			"=r" (__tmp)				\
 		: "m" (__ptr[__LSW]), "m" (__ptr[__MSW]),	\
 			"i" (-EFAULT));				\
-	__disable_user_access();				\
 	(x) = (__typeof__(x))((__typeof__((x)-(x)))(		\
 		(((u64)__hi << 32) | __lo)));			\
 } while (0)
 #endif /* CONFIG_64BIT */
 
+#define __get_user_nocheck(x, __gu_ptr, __gu_err)		\
+do {								\
+	switch (sizeof(*__gu_ptr)) {				\
+	case 1:							\
+		__get_user_asm("lb", (x), __gu_ptr, __gu_err);	\
+		break;						\
+	case 2:							\
+		__get_user_asm("lh", (x), __gu_ptr, __gu_err);	\
+		break;						\
+	case 4:							\
+		__get_user_asm("lw", (x), __gu_ptr, __gu_err);	\
+		break;						\
+	case 8:							\
+		__get_user_8((x), __gu_ptr, __gu_err);	\
+		break;						\
+	default:						\
+		BUILD_BUG();					\
+	}							\
+} while (0)
 
 /**
  * __get_user: - Get a simple variable from user space, with less checking.
@@ -191,25 +206,15 @@ do {								\
  */
 #define __get_user(x, ptr)					\
 ({								\
-	register long __gu_err = 0;				\
 	const __typeof__(*(ptr)) __user *__gu_ptr = (ptr);	\
+	long __gu_err = 0;					\
+								\
 	__chk_user_ptr(__gu_ptr);				\
-	switch (sizeof(*__gu_ptr)) {				\
-	case 1:							\
-		__get_user_asm("lb", (x), __gu_ptr, __gu_err);	\
-		break;						\
-	case 2:							\
-		__get_user_asm("lh", (x), __gu_ptr, __gu_err);	\
-		break;						\
-	case 4:							\
-		__get_user_asm("lw", (x), __gu_ptr, __gu_err);	\
-		break;						\
-	case 8:							\
-		__get_user_8((x), __gu_ptr, __gu_err);	\
-		break;						\
-	default:						\
-		BUILD_BUG();					\
-	}							\
+								\
+	__enable_user_access();					\
+	__get_user_nocheck(x, __gu_ptr, __gu_err);		\
+	__disable_user_access();				\
+								\
 	__gu_err;						\
 })
 
@@ -243,7 +248,6 @@ do {								\
 do {								\
 	uintptr_t __tmp;					\
 	__typeof__(*(ptr)) __x = x;				\
-	__enable_user_access();					\
 	__asm__ __volatile__ (					\
 		"1:\n"						\
 		"	" insn " %z3, %2\n"			\
@@ -260,7 +264,6 @@ do {								\
 		"	.previous"				\
 		: "+r" (err), "=r" (__tmp), "=m" (*(ptr))	\
 		: "rJ" (__x), "i" (-EFAULT));			\
-	__disable_user_access();				\
 } while (0)
 
 #ifdef CONFIG_64BIT
@@ -272,7 +275,6 @@ do {								\
 	u32 __user *__ptr = (u32 __user *)(ptr);		\
 	u64 __x = (__typeof__((x)-(x)))(x);			\
 	uintptr_t __tmp;					\
-	__enable_user_access();					\
 	__asm__ __volatile__ (					\
 		"1:\n"						\
 		"	sw %z4, %2\n"				\
@@ -294,10 +296,28 @@ do {								\
 			"=m" (__ptr[__LSW]),			\
 			"=m" (__ptr[__MSW])			\
 		: "rJ" (__x), "rJ" (__x >> 32), "i" (-EFAULT));	\
-	__disable_user_access();				\
 } while (0)
 #endif /* CONFIG_64BIT */
 
+#define __put_user_nocheck(x, __gu_ptr, __pu_err)					\
+do {								\
+	switch (sizeof(*__gu_ptr)) {				\
+	case 1:							\
+		__put_user_asm("sb", (x), __gu_ptr, __pu_err);	\
+		break;						\
+	case 2:							\
+		__put_user_asm("sh", (x), __gu_ptr, __pu_err);	\
+		break;						\
+	case 4:							\
+		__put_user_asm("sw", (x), __gu_ptr, __pu_err);	\
+		break;						\
+	case 8:							\
+		__put_user_8((x), __gu_ptr, __pu_err);	\
+		break;						\
+	default:						\
+		BUILD_BUG();					\
+	}							\
+} while (0)
 
 /**
  * __put_user: - Write a simple value into user space, with less checking.
@@ -320,25 +340,15 @@ do {								\
  */
 #define __put_user(x, ptr)					\
 ({								\
-	register long __pu_err = 0;				\
 	__typeof__(*(ptr)) __user *__gu_ptr = (ptr);		\
+	long __pu_err = 0;					\
+								\
 	__chk_user_ptr(__gu_ptr);				\
-	switch (sizeof(*__gu_ptr)) {				\
-	case 1:							\
-		__put_user_asm("sb", (x), __gu_ptr, __pu_err);	\
-		break;						\
-	case 2:							\
-		__put_user_asm("sh", (x), __gu_ptr, __pu_err);	\
-		break;						\
-	case 4:							\
-		__put_user_asm("sw", (x), __gu_ptr, __pu_err);	\
-		break;						\
-	case 8:							\
-		__put_user_8((x), __gu_ptr, __pu_err);	\
-		break;						\
-	default:						\
-		BUILD_BUG();					\
-	}							\
+								\
+	__enable_user_access();					\
+	__put_user_nocheck(x, __gu_ptr, __pu_err);		\
+	__disable_user_access();				\
+								\
 	__pu_err;						\
 })
 
-- 
2.28.0


WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-arch@vger.kernel.org, linux-riscv@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 6/8] riscv: refactor __get_user and __put_user
Date: Mon,  7 Sep 2020 07:58:23 +0200	[thread overview]
Message-ID: <20200907055825.1917151-7-hch@lst.de> (raw)
In-Reply-To: <20200907055825.1917151-1-hch@lst.de>

Add new __get_user_nocheck and __put_user_nocheck that switch on the size
and call the actual inline assembly helpers, and move the uaccess enable
/ disable into the actual __get_user and __put_user.  This prepares for
natively implementing __get_kernel_nofault and __put_kernel_nofault.

Also don't bother with the deprecated register keyword for the error
return.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/riscv/include/asm/uaccess.h | 94 ++++++++++++++++++--------------
 1 file changed, 52 insertions(+), 42 deletions(-)

diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h
index e8eedf22e90747..b67d1c616ec348 100644
--- a/arch/riscv/include/asm/uaccess.h
+++ b/arch/riscv/include/asm/uaccess.h
@@ -107,7 +107,6 @@ static inline int __access_ok(unsigned long addr, unsigned long size)
 do {								\
 	uintptr_t __tmp;					\
 	__typeof__(x) __x;					\
-	__enable_user_access();					\
 	__asm__ __volatile__ (					\
 		"1:\n"						\
 		"	" insn " %1, %3\n"			\
@@ -125,7 +124,6 @@ do {								\
 		"	.previous"				\
 		: "+r" (err), "=&r" (__x), "=r" (__tmp)		\
 		: "m" (*(ptr)), "i" (-EFAULT));			\
-	__disable_user_access();				\
 	(x) = __x;						\
 } while (0)
 
@@ -138,7 +136,6 @@ do {								\
 	u32 __user *__ptr = (u32 __user *)(ptr);		\
 	u32 __lo, __hi;						\
 	uintptr_t __tmp;					\
-	__enable_user_access();					\
 	__asm__ __volatile__ (					\
 		"1:\n"						\
 		"	lw %1, %4\n"				\
@@ -162,12 +159,30 @@ do {								\
 			"=r" (__tmp)				\
 		: "m" (__ptr[__LSW]), "m" (__ptr[__MSW]),	\
 			"i" (-EFAULT));				\
-	__disable_user_access();				\
 	(x) = (__typeof__(x))((__typeof__((x)-(x)))(		\
 		(((u64)__hi << 32) | __lo)));			\
 } while (0)
 #endif /* CONFIG_64BIT */
 
+#define __get_user_nocheck(x, __gu_ptr, __gu_err)		\
+do {								\
+	switch (sizeof(*__gu_ptr)) {				\
+	case 1:							\
+		__get_user_asm("lb", (x), __gu_ptr, __gu_err);	\
+		break;						\
+	case 2:							\
+		__get_user_asm("lh", (x), __gu_ptr, __gu_err);	\
+		break;						\
+	case 4:							\
+		__get_user_asm("lw", (x), __gu_ptr, __gu_err);	\
+		break;						\
+	case 8:							\
+		__get_user_8((x), __gu_ptr, __gu_err);	\
+		break;						\
+	default:						\
+		BUILD_BUG();					\
+	}							\
+} while (0)
 
 /**
  * __get_user: - Get a simple variable from user space, with less checking.
@@ -191,25 +206,15 @@ do {								\
  */
 #define __get_user(x, ptr)					\
 ({								\
-	register long __gu_err = 0;				\
 	const __typeof__(*(ptr)) __user *__gu_ptr = (ptr);	\
+	long __gu_err = 0;					\
+								\
 	__chk_user_ptr(__gu_ptr);				\
-	switch (sizeof(*__gu_ptr)) {				\
-	case 1:							\
-		__get_user_asm("lb", (x), __gu_ptr, __gu_err);	\
-		break;						\
-	case 2:							\
-		__get_user_asm("lh", (x), __gu_ptr, __gu_err);	\
-		break;						\
-	case 4:							\
-		__get_user_asm("lw", (x), __gu_ptr, __gu_err);	\
-		break;						\
-	case 8:							\
-		__get_user_8((x), __gu_ptr, __gu_err);	\
-		break;						\
-	default:						\
-		BUILD_BUG();					\
-	}							\
+								\
+	__enable_user_access();					\
+	__get_user_nocheck(x, __gu_ptr, __gu_err);		\
+	__disable_user_access();				\
+								\
 	__gu_err;						\
 })
 
@@ -243,7 +248,6 @@ do {								\
 do {								\
 	uintptr_t __tmp;					\
 	__typeof__(*(ptr)) __x = x;				\
-	__enable_user_access();					\
 	__asm__ __volatile__ (					\
 		"1:\n"						\
 		"	" insn " %z3, %2\n"			\
@@ -260,7 +264,6 @@ do {								\
 		"	.previous"				\
 		: "+r" (err), "=r" (__tmp), "=m" (*(ptr))	\
 		: "rJ" (__x), "i" (-EFAULT));			\
-	__disable_user_access();				\
 } while (0)
 
 #ifdef CONFIG_64BIT
@@ -272,7 +275,6 @@ do {								\
 	u32 __user *__ptr = (u32 __user *)(ptr);		\
 	u64 __x = (__typeof__((x)-(x)))(x);			\
 	uintptr_t __tmp;					\
-	__enable_user_access();					\
 	__asm__ __volatile__ (					\
 		"1:\n"						\
 		"	sw %z4, %2\n"				\
@@ -294,10 +296,28 @@ do {								\
 			"=m" (__ptr[__LSW]),			\
 			"=m" (__ptr[__MSW])			\
 		: "rJ" (__x), "rJ" (__x >> 32), "i" (-EFAULT));	\
-	__disable_user_access();				\
 } while (0)
 #endif /* CONFIG_64BIT */
 
+#define __put_user_nocheck(x, __gu_ptr, __pu_err)					\
+do {								\
+	switch (sizeof(*__gu_ptr)) {				\
+	case 1:							\
+		__put_user_asm("sb", (x), __gu_ptr, __pu_err);	\
+		break;						\
+	case 2:							\
+		__put_user_asm("sh", (x), __gu_ptr, __pu_err);	\
+		break;						\
+	case 4:							\
+		__put_user_asm("sw", (x), __gu_ptr, __pu_err);	\
+		break;						\
+	case 8:							\
+		__put_user_8((x), __gu_ptr, __pu_err);	\
+		break;						\
+	default:						\
+		BUILD_BUG();					\
+	}							\
+} while (0)
 
 /**
  * __put_user: - Write a simple value into user space, with less checking.
@@ -320,25 +340,15 @@ do {								\
  */
 #define __put_user(x, ptr)					\
 ({								\
-	register long __pu_err = 0;				\
 	__typeof__(*(ptr)) __user *__gu_ptr = (ptr);		\
+	long __pu_err = 0;					\
+								\
 	__chk_user_ptr(__gu_ptr);				\
-	switch (sizeof(*__gu_ptr)) {				\
-	case 1:							\
-		__put_user_asm("sb", (x), __gu_ptr, __pu_err);	\
-		break;						\
-	case 2:							\
-		__put_user_asm("sh", (x), __gu_ptr, __pu_err);	\
-		break;						\
-	case 4:							\
-		__put_user_asm("sw", (x), __gu_ptr, __pu_err);	\
-		break;						\
-	case 8:							\
-		__put_user_8((x), __gu_ptr, __pu_err);	\
-		break;						\
-	default:						\
-		BUILD_BUG();					\
-	}							\
+								\
+	__enable_user_access();					\
+	__put_user_nocheck(x, __gu_ptr, __pu_err);		\
+	__disable_user_access();				\
+								\
 	__pu_err;						\
 })
 
-- 
2.28.0


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

  parent reply	other threads:[~2020-09-07  5:58 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-07  5:58 remove set_fs for riscv v2 Christoph Hellwig
2020-09-07  5:58 ` Christoph Hellwig
2020-09-07  5:58 ` [PATCH 1/8] uaccess: provide a generic TASK_SIZE_MAX definition Christoph Hellwig
2020-09-07  5:58   ` Christoph Hellwig
2020-09-07  5:58 ` [PATCH 2/8] asm-generic: improve the nommu {get,put}_user handling Christoph Hellwig
2020-09-07  5:58   ` Christoph Hellwig
2020-09-07  5:58 ` [PATCH 3/8] asm-generic: add nommu implementations of __{get,put}_kernel_nofault Christoph Hellwig
2020-09-07  5:58   ` [PATCH 3/8] asm-generic: add nommu implementations of __{get, put}_kernel_nofault Christoph Hellwig
2020-09-07  5:58 ` [PATCH 4/8] asm-generic: make the set_fs implementation optional Christoph Hellwig
2020-09-07  5:58   ` Christoph Hellwig
2020-09-07  5:58 ` [PATCH 5/8] riscv: use memcpy based uaccess for nommu again Christoph Hellwig
2020-09-07  5:58   ` Christoph Hellwig
2020-09-09  4:59   ` Palmer Dabbelt
2020-09-09  4:59     ` Palmer Dabbelt
2020-09-07  5:58 ` Christoph Hellwig [this message]
2020-09-07  5:58   ` [PATCH 6/8] riscv: refactor __get_user and __put_user Christoph Hellwig
2020-09-09  4:59   ` Palmer Dabbelt
2020-09-09  4:59     ` Palmer Dabbelt
2020-09-07  5:58 ` [PATCH 7/8] riscv: implement __get_kernel_nofault and __put_user_nofault Christoph Hellwig
2020-09-07  5:58   ` Christoph Hellwig
2020-09-09  4:59   ` Palmer Dabbelt
2020-09-09  4:59     ` Palmer Dabbelt
2020-09-07  5:58 ` [PATCH 8/8] riscv: remove address space overrides using set_fs() Christoph Hellwig
2020-09-07  5:58   ` Christoph Hellwig
2020-09-09  4:59   ` Palmer Dabbelt
2020-09-09  4:59     ` Palmer Dabbelt
2020-09-09  4:59 ` remove set_fs for riscv v2 Palmer Dabbelt
2020-09-09  4:59   ` Palmer Dabbelt
2020-09-09  6:55   ` Christoph Hellwig
2020-09-09  6:55     ` Christoph Hellwig
2020-09-09 20:38     ` Palmer Dabbelt
2020-09-09 20:38       ` Palmer Dabbelt
2020-09-22  4:37     ` Christoph Hellwig
2020-09-22  4:37       ` Christoph Hellwig
2020-09-26 17:50       ` Palmer Dabbelt
2020-09-26 17:50         ` Palmer Dabbelt
2020-09-26 19:13         ` Arnd Bergmann
2020-09-26 19:13           ` Arnd Bergmann
2020-10-04 17:27           ` Palmer Dabbelt
2020-10-04 17:27             ` Palmer Dabbelt
2020-09-28 12:49         ` Christoph Hellwig
2020-09-28 12:49           ` Christoph Hellwig
2020-09-28 16:45           ` Palmer Dabbelt
2020-09-28 16:45             ` Palmer Dabbelt
2020-09-29 18:03             ` Christoph Hellwig
2020-09-29 18:03               ` Christoph Hellwig
2020-09-26  6:58 ` Christoph Hellwig
2020-09-26  6:58   ` Christoph Hellwig
  -- strict thread matches above, loose matches on Subject: below --
2020-09-04 16:52 remove set_fs for riscv Christoph Hellwig
2020-09-04 16:52 ` [PATCH 6/8] riscv: refactor __get_user and __put_user Christoph Hellwig
2020-09-04 16:52   ` Christoph Hellwig

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200907055825.1917151-7-hch@lst.de \
    --to=hch@lst.de \
    --cc=arnd@arndb.de \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-riscv@lists.infradead.org \
    --cc=palmer@dabbelt.com \
    --cc=paul.walmsley@sifive.com \
    --cc=viro@zeniv.linux.org.uk \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.