Commit 0a5eae45 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: [optim] uaccess __{get,put}_user() optimised 



Override asm-generic implementations. We basically gain on 2 fronts

* checks for alignment no longer needed as we are only doing "unit"
  sized copies.

  (Careful observer could argue that While the kernel buffers are aligned,
   the user buffer in theory might not be - however in that case the
   user space is already broken when it tries to deref a hword/word
   straddling word boundary - so we are not making it any worse).

* __copy_{to,from}_user( ) returns bytes that couldn't be copied,
  whereas get_user() returns 0 for success or -EFAULT (not size). Thus
  the code to do leftover bytes calculation can be avoided as well.

The savings were significant: ~17k of code.

bloat-o-meter vmlinux_uaccess_pre vmlinux_uaccess_post
add/remove: 0/4 grow/shrink: 8/118 up/down: 1262/-18758 (-17496)
							^^^^^^^^^
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 05d88a49

arch/arc/include/asm/uaccess.h

+105 −0
Original line number Diff line number Diff line
@@ -57,6 +57,111 @@ 
#define __access_ok(addr, sz)	(unlikely(__kernel_ok) || \

				 likely(__user_ok((addr), (sz))))



/*********** Single byte/hword/word copies ******************/



#define __get_user_fn(sz, u, k)					\

({								\

	long __ret = 0;	/* success by default */	\

	switch (sz) {						\

	case 1: __arc_get_user_one(*(k), u, "ldb", __ret); break;	\

	case 2: __arc_get_user_one(*(k), u, "ldw", __ret); break;	\

	case 4: __arc_get_user_one(*(k), u, "ld", __ret);  break;	\

	case 8: __arc_get_user_one_64(*(k), u, __ret);     break;	\

	}							\

	__ret;							\

})



/*

 * Returns 0 on success, -EFAULT if not.

 * @ret already contains 0 - given that errors will be less likely

 * (hence +r asm constraint below).

 * In case of error, fixup code will make it -EFAULT

 */

#define __arc_get_user_one(dst, src, op, ret)	\

	__asm__ __volatile__(                   \

	"1:	"op"    %1,[%2]\n"		\

	"2:	;nop\n"				\

	"	.section .fixup, \"ax\"\n"	\

	"	.align 4\n"			\

	"3:	mov %0, %3\n"			\

	"	j   2b\n"			\

	"	.previous\n"			\

	"	.section __ex_table, \"a\"\n"	\

	"	.align 4\n"			\

	"	.word 1b,3b\n"			\

	"	.previous\n"			\

						\

	: "+r" (ret), "=r" (dst)		\

	: "r" (src), "ir" (-EFAULT))



#define __arc_get_user_one_64(dst, src, ret)	\

	__asm__ __volatile__(                   \

	"1:	ld   %1,[%2]\n"			\

	"4:	ld  %R1,[%2, 4]\n"		\

	"2:	;nop\n"				\

	"	.section .fixup, \"ax\"\n"	\

	"	.align 4\n"			\

	"3:	mov %0, %3\n"			\

	"	j   2b\n"			\

	"	.previous\n"			\

	"	.section __ex_table, \"a\"\n"	\

	"	.align 4\n"			\

	"	.word 1b,3b\n"			\

	"	.word 4b,3b\n"			\

	"	.previous\n"			\

						\

	: "+r" (ret), "=r" (dst)		\

	: "r" (src), "ir" (-EFAULT))



#define __put_user_fn(sz, u, k)					\

({								\

	long __ret = 0;	/* success by default */	\

	switch (sz) {						\

	case 1: __arc_put_user_one(*(k), u, "stb", __ret); break;	\

	case 2: __arc_put_user_one(*(k), u, "stw", __ret); break;	\

	case 4: __arc_put_user_one(*(k), u, "st", __ret);  break;	\

	case 8: __arc_put_user_one_64(*(k), u, __ret);     break;	\

	}							\

	__ret;							\

})



#define __arc_put_user_one(src, dst, op, ret)	\

	__asm__ __volatile__(                   \

	"1:	"op"    %1,[%2]\n"		\

	"2:	;nop\n"				\

	"	.section .fixup, \"ax\"\n"	\

	"	.align 4\n"			\

	"3:	mov %0, %3\n"			\

	"	j   2b\n"			\

	"	.previous\n"			\

	"	.section __ex_table, \"a\"\n"	\

	"	.align 4\n"			\

	"	.word 1b,3b\n"			\

	"	.previous\n"			\

						\

	: "+r" (ret)				\

	: "r" (src), "r" (dst), "ir" (-EFAULT))



#define __arc_put_user_one_64(src, dst, ret)	\

	__asm__ __volatile__(                   \

	"1:	st   %1,[%2]\n"			\

	"4:	st  %R1,[%2, 4]\n"		\

	"2:	;nop\n"				\

	"	.section .fixup, \"ax\"\n"	\

	"	.align 4\n"			\

	"3:	mov %0, %3\n"			\

	"	j   2b\n"			\

	"	.previous\n"			\

	"	.section __ex_table, \"a\"\n"	\

	"	.align 4\n"			\

	"	.word 1b,3b\n"			\

	"	.word 4b,3b\n"			\

	"	.previous\n"			\

						\

	: "+r" (ret)				\

	: "r" (src), "r" (dst), "ir" (-EFAULT))





static inline unsigned long

__arc_copy_from_user(void *to, const void __user *from, unsigned long n)

{

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