Commit b7121395 authored by Al Viro's avatar Al Viro
Browse files

alpha: propagate the calling convention changes down to csum_partial_copy.c helpers 



get rid of set_fs() in csum_partial_copy_nocheck(), while we are at it -
just take the part of csum_and_copy_from_user() sans the access_ok() check
into a helper function and have csum_partial_copy_nocheck() call that.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent c693cc46

arch/alpha/lib/csum_partial_copy.c

+69 −88
Original line number Diff line number Diff line
@@ -39,12 +39,11 @@ __asm__ __volatile__("insql %1,%2,%0":"=r" (z):"r" (x),"r" (y)) 
#define insqh(x,y,z) \

__asm__ __volatile__("insqh %1,%2,%0":"=r" (z):"r" (x),"r" (y))





#define __get_user_u(x,ptr)				\

#define __get_word(insn,x,ptr)				\

({							\

	long __guu_err;					\

	__asm__ __volatile__(				\

	"1:	ldq_u %0,%2\n"				\

	"1:	"#insn" %0,%2\n"			\

	"2:\n"						\

	EXC(1b,2b,%0,%1)				\

		: "=r"(x), "=r"(__guu_err)		\
@@ -52,19 +51,6 @@ __asm__ __volatile__("insqh %1,%2,%0":"=r" (z):"r" (x),"r" (y)) 
	__guu_err;					\

})



#define __put_user_u(x,ptr)				\

({							\

	long __puu_err;					\

	__asm__ __volatile__(				\

	"1:	stq_u %2,%1\n"				\

	"2:\n"						\

	EXC(1b,2b,$31,%0)				\

		: "=r"(__puu_err)			\

		: "m"(__m(addr)), "rJ"(x), "0"(0));	\

	__puu_err;					\

})





static inline unsigned short from64to16(unsigned long x)

{

	/* Using extract instructions is a bit more efficient
@@ -95,15 +81,15 @@ static inline unsigned short from64to16(unsigned long x) 
 */

static inline unsigned long

csum_partial_cfu_aligned(const unsigned long __user *src, unsigned long *dst,

			 long len, unsigned long checksum,

			 int *errp)

			 long len)

{

	unsigned long checksum = ~0U;

	unsigned long carry = 0;

	int err = 0;



	while (len >= 0) {

		unsigned long word;

		err |= __get_user(word, src);

		if (__get_word(ldq, word, src))

			return 0;

		checksum += carry;

		src++;

		checksum += word;
@@ -116,7 +102,8 @@ csum_partial_cfu_aligned(const unsigned long __user *src, unsigned long *dst, 
	checksum += carry;

	if (len) {

		unsigned long word, tmp;

		err |= __get_user(word, src);

		if (__get_word(ldq, word, src))

			return 0;

		tmp = *dst;

		mskql(word, len, word);

		checksum += word;
@@ -125,7 +112,6 @@ csum_partial_cfu_aligned(const unsigned long __user *src, unsigned long *dst, 
		*dst = word | tmp;

		checksum += carry;

	}

	if (err && errp) *errp = err;

	return checksum;

}
@@ -137,20 +123,21 @@ static inline unsigned long 
csum_partial_cfu_dest_aligned(const unsigned long __user *src,

			      unsigned long *dst,

			      unsigned long soff,

			      long len, unsigned long checksum,

			      int *errp)

			      long len)

{

	unsigned long first;

	unsigned long word, carry;

	unsigned long lastsrc = 7+len+(unsigned long)src;

	int err = 0;

	unsigned long checksum = ~0U;



	err |= __get_user_u(first,src);

	if (__get_word(ldq_u, first,src))

		return 0;

	carry = 0;

	while (len >= 0) {

		unsigned long second;



		err |= __get_user_u(second, src+1);

		if (__get_word(ldq_u, second, src+1))

			return 0;

		extql(first, soff, word);

		len -= 8;

		src++;
@@ -168,7 +155,8 @@ csum_partial_cfu_dest_aligned(const unsigned long __user *src, 
	if (len) {

		unsigned long tmp;

		unsigned long second;

		err |= __get_user_u(second, lastsrc);

		if (__get_word(ldq_u, second, lastsrc))

			return 0;

		tmp = *dst;

		extql(first, soff, word);

		extqh(second, soff, first);
@@ -180,7 +168,6 @@ csum_partial_cfu_dest_aligned(const unsigned long __user *src, 
		*dst = word | tmp;

		checksum += carry;

	}

	if (err && errp) *errp = err;

	return checksum;

}
@@ -191,18 +178,18 @@ static inline unsigned long 
csum_partial_cfu_src_aligned(const unsigned long __user *src,

			     unsigned long *dst,

			     unsigned long doff,

			     long len, unsigned long checksum,

			     unsigned long partial_dest,

			     int *errp)

			     long len,

			     unsigned long partial_dest)

{

	unsigned long carry = 0;

	unsigned long word;

	unsigned long second_dest;

	int err = 0;

	unsigned long checksum = ~0U;



	mskql(partial_dest, doff, partial_dest);

	while (len >= 0) {

		err |= __get_user(word, src);

		if (__get_word(ldq, word, src))

			return 0;

		len -= 8;

		insql(word, doff, second_dest);

		checksum += carry;
@@ -216,7 +203,8 @@ csum_partial_cfu_src_aligned(const unsigned long __user *src, 
	len += 8;

	if (len) {

		checksum += carry;

		err |= __get_user(word, src);

		if (__get_word(ldq, word, src))

			return 0;

		mskql(word, len, word);

		len -= 8;

		checksum += word;
@@ -237,7 +225,6 @@ csum_partial_cfu_src_aligned(const unsigned long __user *src, 
	stq_u(partial_dest | second_dest, dst);

out:

	checksum += carry;

	if (err && errp) *errp = err;

	return checksum;

}
@@ -249,23 +236,23 @@ static inline unsigned long 
csum_partial_cfu_unaligned(const unsigned long __user * src,

			   unsigned long * dst,

			   unsigned long soff, unsigned long doff,

			   long len, unsigned long checksum,

			   unsigned long partial_dest,

			   int *errp)

			   long len, unsigned long partial_dest)

{

	unsigned long carry = 0;

	unsigned long first;

	unsigned long lastsrc;

	int err = 0;

	unsigned long checksum = ~0U;



	err |= __get_user_u(first, src);

	if (__get_word(ldq_u, first, src))

		return 0;

	lastsrc = 7+len+(unsigned long)src;

	mskql(partial_dest, doff, partial_dest);

	while (len >= 0) {

		unsigned long second, word;

		unsigned long second_dest;



		err |= __get_user_u(second, src+1);

		if (__get_word(ldq_u, second, src+1))

			return 0;

		extql(first, soff, word);

		checksum += carry;

		len -= 8;
@@ -286,7 +273,8 @@ csum_partial_cfu_unaligned(const unsigned long __user * src, 
		unsigned long second, word;

		unsigned long second_dest;



		err |= __get_user_u(second, lastsrc);

		if (__get_word(ldq_u, second, lastsrc))

			return 0;

		extql(first, soff, word);

		extqh(second, soff, first);

		word |= first;
@@ -307,7 +295,8 @@ csum_partial_cfu_unaligned(const unsigned long __user * src, 
		unsigned long second, word;

		unsigned long second_dest;



		err |= __get_user_u(second, lastsrc);

		if (__get_word(ldq_u, second, lastsrc))

			return 0;

		extql(first, soff, word);

		extqh(second, soff, first);

		word |= first;
@@ -320,32 +309,25 @@ csum_partial_cfu_unaligned(const unsigned long __user * src, 
		stq_u(partial_dest | word | second_dest, dst);

		checksum += carry;

	}

	if (err && errp) *errp = err;

	return checksum;

}



__wsum

csum_and_copy_from_user(const void __user *src, void *dst, int len)

static __wsum __csum_and_copy(const void __user *src, void *dst, int len)

{

	unsigned long checksum = ~0U;

	unsigned long soff = 7 & (unsigned long) src;

	unsigned long doff = 7 & (unsigned long) dst;

	int err = 0;

	unsigned long checksum;



	if (len) {

		if (!access_ok(src, len))

			return 0;

	if (!doff) {

		if (!soff)

			checksum = csum_partial_cfu_aligned(

				(const unsigned long __user *) src,

					(unsigned long *) dst,

					len-8, checksum, &err);

				(unsigned long *) dst, len-8);

		else

			checksum = csum_partial_cfu_dest_aligned(

				(const unsigned long __user *) src,

				(unsigned long *) dst,

					soff, len-8, checksum, &err);

				soff, len-8);

	} else {

		unsigned long partial_dest;

		ldq_u(partial_dest, dst);
@@ -353,30 +335,29 @@ csum_and_copy_from_user(const void __user *src, void *dst, int len) 
			checksum = csum_partial_cfu_src_aligned(

				(const unsigned long __user *) src,

				(unsigned long *) dst,

					doff, len-8, checksum,

					partial_dest, &err);

				doff, len-8, partial_dest);

		else

			checksum = csum_partial_cfu_unaligned(

				(const unsigned long __user *) src,

				(unsigned long *) dst,

					soff, doff, len-8, checksum,

					partial_dest, &err);

				soff, doff, len-8, partial_dest);

	}

		checksum = err ? 0 : from64to16 (checksum);

	return (__force __wsum)from64to16 (checksum);

}

	return (__force __wsum)checksum;



__wsum

csum_and_copy_from_user(const void __user *src, void *dst, int len)

{

	if (!access_ok(src, len))

		return 0;

	return __csum_and_copy(src, dst, len);

}

EXPORT_SYMBOL(csum_and_copy_from_user);



__wsum

csum_partial_copy_nocheck(const void *src, void *dst, int len)

{

	__wsum checksum;

	mm_segment_t oldfs = get_fs();

	set_fs(KERNEL_DS);

	checksum = csum_and_copy_from_user((__force const void __user *)src,

	return __csum_and_copy((__force const void __user *)src,

						dst, len);

	set_fs(oldfs);

	return checksum;

}

EXPORT_SYMBOL(csum_partial_copy_nocheck);