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Subject[PATCH] 2.5.38 s390 fixes: 12_inline.
Date
Inline csum_partial for s390, the only reason it was out-of-line previously
is that some older compilers could not get the inline version right.

diff -urN linux-2.5.38/arch/s390/lib/Makefile linux-2.5.38-s390/arch/s390/lib/Makefile
--- linux-2.5.38/arch/s390/lib/Makefile Sun Sep 22 06:25:00 2002
+++ linux-2.5.38-s390/arch/s390/lib/Makefile Tue Sep 24 17:42:48 2002
@@ -6,8 +6,7 @@

EXTRA_AFLAGS := -traditional

-obj-y = checksum.o delay.o memset.o misaligned.o strcmp.o strncpy.o uaccess.o
-export-objs += misaligned.o
+obj-y = delay.o memset.o strcmp.o strncpy.o uaccess.o

include $(TOPDIR)/Rules.make

diff -urN linux-2.5.38/arch/s390/lib/checksum.c linux-2.5.38-s390/arch/s390/lib/checksum.c
--- linux-2.5.38/arch/s390/lib/checksum.c Sun Sep 22 06:24:58 2002
+++ linux-2.5.38-s390/arch/s390/lib/checksum.c Thu Jan 1 01:00:00 1970
@@ -1,57 +0,0 @@
-/*
- * arch/s390/lib/checksum.c
- * S390 fast network checksum routines
- *
- * S390 version
- * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Ulrich Hild (first version),
- * Martin Schwidefsky (schwidefsky@de.ibm.com),
- * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
- *
- * This file contains network checksum routines
- */
-
-#include <linux/string.h>
-#include <linux/types.h>
-#include <asm/uaccess.h>
-#include <asm/byteorder.h>
-#include <asm/checksum.h>
-
-/*
- * computes a partial checksum, e.g. for TCP/UDP fragments
- */
-unsigned int
-csum_partial (const unsigned char *buff, int len, unsigned int sum)
-{
- register_pair rp;
- /*
- * Experiments with ethernet and slip connections show that buff
- * is aligned on either a 2-byte or 4-byte boundary.
- */
- rp.subreg.even = (unsigned long) buff;
- rp.subreg.odd = (unsigned long) len;
- __asm__ __volatile__ (
- "0: cksm %0,%1\n" /* do checksum on longs */
- " jo 0b\n"
- : "+&d" (sum), "+&a" (rp) : : "cc" );
- return sum;
-}
-
-/*
- * Fold a partial checksum without adding pseudo headers
- */
-unsigned short csum_fold(unsigned int sum)
-{
- register_pair rp;
-
- __asm__ __volatile__ (
- " slr %N1,%N1\n" /* %0 = H L */
- " lr %1,%0\n" /* %0 = H L, %1 = H L 0 0 */
- " srdl %1,16\n" /* %0 = H L, %1 = 0 H L 0 */
- " alr %1,%N1\n" /* %0 = H L, %1 = L H L 0 */
- " alr %0,%1\n" /* %0 = H+L+C L+H */
- " srl %0,16\n" /* %0 = H+L+C */
- : "+&d" (sum), "=d" (rp) : : "cc" );
- return ((unsigned short) ~sum);
-}
-
diff -urN linux-2.5.38/arch/s390/lib/misaligned.c linux-2.5.38-s390/arch/s390/lib/misaligned.c
--- linux-2.5.38/arch/s390/lib/misaligned.c Sun Sep 22 06:25:11 2002
+++ linux-2.5.38-s390/arch/s390/lib/misaligned.c Thu Jan 1 01:00:00 1970
@@ -1,29 +0,0 @@
-/*
- * arch/s390/lib/misaligned.c
- * S390 misalignment panic stubs
- *
- * S390 version
- * Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com).
- *
- * xchg wants to panic if the pointer is not aligned. To avoid multiplying
- * the panic message over and over again, the panic is done in the helper
- * functions __misaligned_u32 and __misaligned_u16.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-
-void __misaligned_u16(void)
-{
- panic("misaligned (__u16 *) in __xchg\n");
-}
-
-void __misaligned_u32(void)
-{
- panic("misaligned (__u32 *) in __xchg\n");
-}
-
-EXPORT_SYMBOL(__misaligned_u16);
-EXPORT_SYMBOL(__misaligned_u32);
-
diff -urN linux-2.5.38/arch/s390x/lib/Makefile linux-2.5.38-s390/arch/s390x/lib/Makefile
--- linux-2.5.38/arch/s390x/lib/Makefile Sun Sep 22 06:25:01 2002
+++ linux-2.5.38-s390/arch/s390x/lib/Makefile Tue Sep 24 17:42:48 2002
@@ -6,8 +6,7 @@

EXTRA_AFLAGS := -traditional

-obj-y = checksum.o delay.o memset.o misaligned.o strcmp.o strncpy.o uaccess.o
-export-objs += misaligned.o
+obj-y = delay.o memset.o strcmp.o strncpy.o uaccess.o

include $(TOPDIR)/Rules.make

diff -urN linux-2.5.38/arch/s390x/lib/checksum.c linux-2.5.38-s390/arch/s390x/lib/checksum.c
--- linux-2.5.38/arch/s390x/lib/checksum.c Sun Sep 22 06:25:11 2002
+++ linux-2.5.38-s390/arch/s390x/lib/checksum.c Thu Jan 1 01:00:00 1970
@@ -1,40 +0,0 @@
-/*
- * arch/s390/lib/checksum.c
- * S390 fast network checksum routines
- *
- * S390 version
- * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Ulrich Hild (first version),
- * Martin Schwidefsky (schwidefsky@de.ibm.com),
- * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
- *
- * This file contains network checksum routines
- */
-
-#include <linux/string.h>
-#include <linux/types.h>
-#include <asm/uaccess.h>
-#include <asm/byteorder.h>
-#include <asm/checksum.h>
-
-/*
- * computes a partial checksum, e.g. for TCP/UDP fragments
- */
-unsigned int
-csum_partial (const unsigned char *buff, int len, unsigned int sum)
-{
- /*
- * Experiments with ethernet and slip connections show that buff
- * is aligned on either a 2-byte or 4-byte boundary.
- */
- __asm__ __volatile__ (
- " lgr 2,%1\n" /* address in gpr 2 */
- " lgfr 3,%2\n" /* length in gpr 3 */
- "0: cksm %0,2\n" /* do checksum on longs */
- " jo 0b\n"
- : "+&d" (sum)
- : "d" (buff), "d" (len)
- : "cc", "2", "3" );
- return sum;
-}
-
diff -urN linux-2.5.38/arch/s390x/lib/misaligned.c linux-2.5.38-s390/arch/s390x/lib/misaligned.c
--- linux-2.5.38/arch/s390x/lib/misaligned.c Sun Sep 22 06:25:16 2002
+++ linux-2.5.38-s390/arch/s390x/lib/misaligned.c Thu Jan 1 01:00:00 1970
@@ -1,34 +0,0 @@
-/*
- * arch/s390/lib/misaligned.c
- * S390 misalignment panic stubs
- *
- * S390 version
- * Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com).
- *
- * xchg wants to panic if the pointer is not aligned. To avoid multiplying
- * the panic message over and over again, the panic is done in the helper
- * functions __misaligned_u64, __misaligned_u32 and __misaligned_u16.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-
-void __misaligned_u16(void)
-{
- panic("misaligned (__u16 *) in __xchg\n");
-}
-
-void __misaligned_u32(void)
-{
- panic("misaligned (__u32 *) in __xchg\n");
-}
-
-void __misaligned_u64(void)
-{
- panic("misaligned (__u64 *) in __xchg\n");
-}
-
-EXPORT_SYMBOL(__misaligned_u16);
-EXPORT_SYMBOL(__misaligned_u32);
-EXPORT_SYMBOL(__misaligned_u64);
diff -urN linux-2.5.38/include/asm-s390/checksum.h linux-2.5.38-s390/include/asm-s390/checksum.h
--- linux-2.5.38/include/asm-s390/checksum.h Sun Sep 22 06:24:58 2002
+++ linux-2.5.38-s390/include/asm-s390/checksum.h Tue Sep 24 17:42:48 2002
@@ -27,13 +27,27 @@
*
* it's best to have buff aligned on a 32-bit boundary
*/
-unsigned int
-csum_partial(const unsigned char * buff, int len, unsigned int sum);
+static inline unsigned int
+csum_partial(const unsigned char * buff, int len, unsigned int sum)
+{
+ register_pair rp;
+ /*
+ * Experiments with ethernet and slip connections show that buf
+ * is aligned on either a 2-byte or 4-byte boundary.
+ */
+ rp.subreg.even = (unsigned long) buff;
+ rp.subreg.odd = (unsigned long) len;
+ __asm__ __volatile__ (
+ "0: cksm %0,%1\n" /* do checksum on longs */
+ " jo 0b\n"
+ : "+&d" (sum), "+&a" (rp) : : "cc" );
+ return sum;
+}

/*
* csum_partial as an inline function
*/
-extern inline unsigned int
+static inline unsigned int
csum_partial_inline(const unsigned char * buff, int len, unsigned int sum)
{
register_pair rp;
@@ -55,7 +69,7 @@
* better 64-bit) boundary
*/

-extern inline unsigned int
+static inline unsigned int
csum_partial_copy(const char *src, char *dst, int len,unsigned int sum)
{
memcpy(dst,src,len);
@@ -71,7 +85,7 @@
* Copy from userspace and compute checksum. If we catch an exception
* then zero the rest of the buffer.
*/
-extern inline unsigned int
+static inline unsigned int
csum_partial_copy_from_user (const char *src, char *dst,
int len, unsigned int sum,
int *err_ptr)
@@ -88,7 +102,7 @@
}


-extern inline unsigned int
+static inline unsigned int
csum_partial_copy_nocheck (const char *src, char *dst, int len, unsigned int sum)
{
memcpy(dst,src,len);
@@ -98,10 +112,7 @@
/*
* Fold a partial checksum without adding pseudo headers
*/
-#if 1
-unsigned short csum_fold(unsigned int sum);
-#else
-extern inline unsigned short
+static inline unsigned short
csum_fold(unsigned int sum)
{
register_pair rp;
@@ -116,14 +127,13 @@
: "+&d" (sum), "=d" (rp) : : "cc" );
return ((unsigned short) ~sum);
}
-#endif

/*
* This is a version of ip_compute_csum() optimized for IP headers,
* which always checksum on 4 octet boundaries.
*
*/
-extern inline unsigned short
+static inline unsigned short
ip_fast_csum(unsigned char *iph, unsigned int ihl)
{
register_pair rp;
@@ -143,7 +153,7 @@
* computes the checksum of the TCP/UDP pseudo-header
* returns a 32-bit checksum
*/
-extern inline unsigned int
+static inline unsigned int
csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
unsigned short len, unsigned short proto,
unsigned int sum)
@@ -176,7 +186,7 @@
* returns a 16-bit checksum, already complemented
*/

-extern inline unsigned short int
+static inline unsigned short int
csum_tcpudp_magic(unsigned long saddr, unsigned long daddr,
unsigned short len, unsigned short proto,
unsigned int sum)
@@ -189,7 +199,7 @@
* in icmp.c
*/

-extern inline unsigned short
+static inline unsigned short
ip_compute_csum(unsigned char * buff, int len)
{
return csum_fold(csum_partial(buff, len, 0));
diff -urN linux-2.5.38/include/asm-s390/system.h linux-2.5.38-s390/include/asm-s390/system.h
--- linux-2.5.38/include/asm-s390/system.h Tue Sep 24 17:41:38 2002
+++ linux-2.5.38-s390/include/asm-s390/system.h Tue Sep 24 17:42:48 2002
@@ -30,73 +30,56 @@

#define nop() __asm__ __volatile__ ("nop")

-#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
-
-extern void __misaligned_u16(void);
-extern void __misaligned_u32(void);
+#define xchg(ptr,x) \
+ ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))

static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
{
+ unsigned long addr, old;
+ int shift;
+
switch (size) {
- case 1:
- asm volatile (
- " lhi 1,3\n"
- " nr 1,%0\n" /* isolate last 2 bits */
- " xr %0,1\n" /* align ptr */
- " bras 2,0f\n"
- " icm 1,8,3(%1)\n" /* for ptr&3 == 0 */
- " stcm 0,8,3(%1)\n"
- " icm 1,4,3(%1)\n" /* for ptr&3 == 1 */
- " stcm 0,4,3(%1)\n"
- " icm 1,2,3(%1)\n" /* for ptr&3 == 2 */
- " stcm 0,2,3(%1)\n"
- " icm 1,1,3(%1)\n" /* for ptr&3 == 3 */
- " stcm 0,1,3(%1)\n"
- "0: sll 1,3\n"
- " la 2,0(1,2)\n" /* r2 points to an icm */
- " l 0,0(%0)\n" /* get fullword */
- "1: lr 1,0\n" /* cs loop */
- " ex 0,0(2)\n" /* insert x */
- " cs 0,1,0(%0)\n"
- " jl 1b\n"
- " ex 0,4(2)" /* store *ptr to x */
- : "+a&" (ptr) : "a" (&x)
- : "memory", "cc", "0", "1", "2");
- break;
- case 2:
- if(((__u32)ptr)&1)
- __misaligned_u16();
- asm volatile (
- " lhi 1,2\n"
- " nr 1,%0\n" /* isolate bit 2^1 */
- " xr %0,1\n" /* align ptr */
- " bras 2,0f\n"
- " icm 1,12,2(%1)\n" /* for ptr&2 == 0 */
- " stcm 0,12,2(%1)\n"
- " icm 1,3,2(%1)\n" /* for ptr&2 == 1 */
- " stcm 0,3,2(%1)\n"
- "0: sll 1,2\n"
- " la 2,0(1,2)\n" /* r2 points to an icm */
- " l 0,0(%0)\n" /* get fullword */
- "1: lr 1,0\n" /* cs loop */
- " ex 0,0(2)\n" /* insert x */
- " cs 0,1,0(%0)\n"
- " jl 1b\n"
- " ex 0,4(2)" /* store *ptr to x */
- : "+a&" (ptr) : "a" (&x)
- : "memory", "cc", "0", "1", "2");
- break;
- case 4:
- if(((__u32)ptr)&3)
- __misaligned_u32();
- asm volatile (
- " l 0,0(%1)\n"
- "0: cs 0,%0,0(%1)\n"
- " jl 0b\n"
- " lr %0,0\n"
- : "+d&" (x) : "a" (ptr)
- : "memory", "cc", "0" );
- break;
+ case 1:
+ addr = (unsigned long) ptr;
+ shift = (3 ^ (addr & 3)) << 3;
+ addr ^= addr & 3;
+ asm volatile(
+ " l %0,0(%3)\n"
+ "0: lr 0,%0\n"
+ " nr 0,%2\n"
+ " or 0,%1\n"
+ " cs %0,0,0(%3)\n"
+ " jl 0b\n"
+ : "=&d" (old)
+ : "d" (x << shift), "d" (~(255 << shift)), "a" (addr)
+ : "memory", "cc", "0" );
+ x = old >> shift;
+ break;
+ case 2:
+ addr = (unsigned long) ptr;
+ shift = (2 ^ (addr & 2)) << 3;
+ addr ^= addr & 2;
+ asm volatile(
+ " l %0,0(%3)\n"
+ "0: lr 0,%0\n"
+ " nr 0,%2\n"
+ " or 0,%1\n"
+ " cs %0,0,0(%3)\n"
+ " jl 0b\n"
+ : "=&d" (old)
+ : "d" (x << shift), "d" (~(65535 << shift)), "a" (addr)
+ : "memory", "cc", "0" );
+ x = old >> shift;
+ break;
+ case 4:
+ asm volatile (
+ " l %0,0(%2)\n"
+ "0: cs %0,%1,0(%2)\n"
+ " jl 0b\n"
+ : "=&d" (old) : "d" (x), "a" (ptr)
+ : "memory", "cc", "0" );
+ x = old;
+ break;
}
return x;
}
diff -urN linux-2.5.38/include/asm-s390x/checksum.h linux-2.5.38-s390/include/asm-s390x/checksum.h
--- linux-2.5.38/include/asm-s390x/checksum.h Sun Sep 22 06:25:18 2002
+++ linux-2.5.38-s390/include/asm-s390x/checksum.h Tue Sep 24 17:42:48 2002
@@ -27,13 +27,29 @@
*
* it's best to have buff aligned on a 32-bit boundary
*/
-unsigned int
-csum_partial(const unsigned char * buff, int len, unsigned int sum);
+static inline unsigned int
+csum_partial(const unsigned char * buff, int len, unsigned int sum)
+{
+ /*
+ * Experiments with ethernet and slip connections show that buff
+ * is aligned on either a 2-byte or 4-byte boundary.
+ */
+ __asm__ __volatile__ (
+ " lgr 2,%1\n" /* address in gpr 2 */
+ " lgfr 3,%2\n" /* length in gpr 3 */
+ "0: cksm %0,2\n" /* do checksum on longs */
+ " jo 0b\n"
+ : "+&d" (sum)
+ : "d" (buff), "d" (len)
+ : "cc", "2", "3" );
+ return sum;
+
+}

/*
* csum_partial as an inline function
*/
-extern inline unsigned int
+static inline unsigned int
csum_partial_inline(const unsigned char * buff, int len, unsigned int sum)
{
__asm__ __volatile__ (
@@ -55,7 +71,7 @@
* better 64-bit) boundary
*/

-extern inline unsigned int
+static inline unsigned int
csum_partial_copy(const char *src, char *dst, int len,unsigned int sum)
{
memcpy(dst,src,len);
@@ -71,7 +87,7 @@
* Copy from userspace and compute checksum. If we catch an exception
* then zero the rest of the buffer.
*/
-extern inline unsigned int
+static inline unsigned int
csum_partial_copy_from_user (const char *src, char *dst,
int len, unsigned int sum,
int *err_ptr)
@@ -87,7 +103,7 @@
return csum_partial(dst, len, sum);
}

-extern inline unsigned int
+static inline unsigned int
csum_partial_copy_nocheck (const char *src, char *dst, int len, unsigned int sum)
{
memcpy(dst,src,len);
@@ -97,7 +113,7 @@
/*
* Fold a partial checksum without adding pseudo headers
*/
-extern inline unsigned short
+static inline unsigned short
csum_fold(unsigned int sum)
{
__asm__ __volatile__ (
@@ -116,7 +132,7 @@
* which always checksum on 4 octet boundaries.
*
*/
-extern inline unsigned short
+static inline unsigned short
ip_fast_csum(unsigned char *iph, unsigned int ihl)
{
unsigned long sum;
@@ -137,7 +153,7 @@
* computes the checksum of the TCP/UDP pseudo-header
* returns a 32-bit checksum
*/
-extern inline unsigned int
+static inline unsigned int
csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
unsigned short len, unsigned short proto,
unsigned int sum)
@@ -170,7 +186,7 @@
* returns a 16-bit checksum, already complemented
*/

-extern inline unsigned short int
+static inline unsigned short int
csum_tcpudp_magic(unsigned long saddr, unsigned long daddr,
unsigned short len, unsigned short proto,
unsigned int sum)
@@ -183,7 +199,7 @@
* in icmp.c
*/

-extern inline unsigned short
+static inline unsigned short
ip_compute_csum(unsigned char * buff, int len)
{
return csum_fold(csum_partial_inline(buff, len, 0));
diff -urN linux-2.5.38/include/asm-s390x/system.h linux-2.5.38-s390/include/asm-s390x/system.h
--- linux-2.5.38/include/asm-s390x/system.h Tue Sep 24 17:41:38 2002
+++ linux-2.5.38-s390/include/asm-s390x/system.h Tue Sep 24 17:42:48 2002
@@ -39,77 +39,60 @@

static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
{
+ unsigned long addr, old;
+ int shift;
+
switch (size) {
- case 1:
- asm volatile (
- " lghi 1,3\n"
- " nr 1,%0\n" /* isolate last 2 bits */
- " xr %0,1\n" /* align ptr */
- " bras 2,0f\n"
- " icm 1,8,7(%1)\n" /* for ptr&3 == 0 */
- " stcm 0,8,7(%1)\n"
- " icm 1,4,7(%1)\n" /* for ptr&3 == 1 */
- " stcm 0,4,7(%1)\n"
- " icm 1,2,7(%1)\n" /* for ptr&3 == 2 */
- " stcm 0,2,7(%1)\n"
- " icm 1,1,7(%1)\n" /* for ptr&3 == 3 */
- " stcm 0,1,7(%1)\n"
- "0: sll 1,3\n"
- " la 2,0(1,2)\n" /* r2 points to an icm */
- " l 0,0(%0)\n" /* get fullword */
- "1: lr 1,0\n" /* cs loop */
- " ex 0,0(2)\n" /* insert x */
- " cs 0,1,0(%0)\n"
- " jl 1b\n"
- " ex 0,4(2)" /* store *ptr to x */
- : "+&a" (ptr) : "a" (&x)
- : "memory", "cc", "0", "1", "2");
- break;
- case 2:
- if(((addr_t)ptr)&1)
- __misaligned_u16();
- asm volatile (
- " lghi 1,2\n"
- " nr 1,%0\n" /* isolate bit 2^1 */
- " xr %0,1\n" /* align ptr */
- " bras 2,0f\n"
- " icm 1,12,6(%1)\n" /* for ptr&2 == 0 */
- " stcm 0,12,6(%1)\n"
- " icm 1,3,2(%1)\n" /* for ptr&2 == 1 */
- " stcm 0,3,2(%1)\n"
- "0: sll 1,2\n"
- " la 2,0(1,2)\n" /* r2 points to an icm */
- " l 0,0(%0)\n" /* get fullword */
- "1: lr 1,0\n" /* cs loop */
- " ex 0,0(2)\n" /* insert x */
- " cs 0,1,0(%0)\n"
- " jl 1b\n"
- " ex 0,4(2)" /* store *ptr to x */
- : "+&a" (ptr) : "a" (&x)
- : "memory", "cc", "0", "1", "2");
- break;
- case 4:
- if(((addr_t)ptr)&3)
- __misaligned_u32();
- asm volatile (
- " l 0,0(%1)\n"
- "0: cs 0,%0,0(%1)\n"
- " jl 0b\n"
- " lgfr %0,0\n"
- : "+d" (x) : "a" (ptr)
- : "memory", "cc", "0" );
- break;
- case 8:
- if(((addr_t)ptr)&7)
- __misaligned_u64();
- asm volatile (
- " lg 0,0(%1)\n"
- "0: csg 0,%0,0(%1)\n"
- " jl 0b\n"
- " lgr %0,0\n"
- : "+d" (x) : "a" (ptr)
- : "memory", "cc", "0" );
- break;
+ case 1:
+ addr = (unsigned long) ptr;
+ shift = (3 ^ (addr & 3)) << 3;
+ addr ^= addr & 3;
+ asm volatile(
+ " l %0,0(%3)\n"
+ "0: lr 0,%0\n"
+ " nr 0,%2\n"
+ " or 0,%1\n"
+ " cs %0,0,0(%3)\n"
+ " jl 0b\n"
+ : "=&d" (old)
+ : "d" (x << shift), "d" (~(255 << shift)), "a" (addr)
+ : "memory", "cc", "0" );
+ x = old >> shift;
+ break;
+ case 2:
+ addr = (unsigned long) ptr;
+ shift = (2 ^ (addr & 2)) << 3;
+ addr ^= addr & 2;
+ asm volatile(
+ " l %0,0(%3)\n"
+ "0: lr 0,%0\n"
+ " nr 0,%2\n"
+ " or 0,%1\n"
+ " cs %0,0,0(%3)\n"
+ " jl 0b\n"
+ : "=&d" (old)
+ : "d" (x << shift), "d" (~(65535 << shift)), "a" (addr)
+ : "memory", "cc", "0" );
+ x = old >> shift;
+ break;
+ case 4:
+ asm volatile (
+ " l %0,0(%2)\n"
+ "0: cs %0,%1,0(%2)\n"
+ " jl 0b\n"
+ : "=&d" (old) : "d" (x), "a" (ptr)
+ : "memory", "cc", "0" );
+ x = old;
+ break;
+ case 8:
+ asm volatile (
+ " lg %0,0(%2)\n"
+ "0: csg %0,%1,0(%2)\n"
+ " jl 0b\n"
+ : "=&d" (old) : "d" (x), "a" (ptr)
+ : "memory", "cc", "0" );
+ x = old;
+ break;
}
return x;
}
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