glibc-2.2.5-ppc405erratum77.patch

linux下编译交叉工具链的工具源码

# see http://bugs.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=4155
# and http://www.kegel.com/xgcc3/ppc405erratum77.html
# See also matching patch for linuxthreads

diff -aur glibc-2.2.5.orig/sysdeps/powerpc/atomicity.h glibc-2.2.5/sysdeps/powerpc/atomicity.h
--- glibc-2.2.5.orig/sysdeps/powerpc/atomicity.h	Thu Jul  5 21:56:01 2001
+++ glibc-2.2.5/sysdeps/powerpc/atomicity.h	Tue Jul 23 05:39:38 2002
@@ -28,6 +28,17 @@
 # define __ATOMICITY_INLINE inline
 #endif
 
+#ifdef __PPC405__
+/* workaround for PPC405 erratum #77 - Mark Hatle, dank.  References:
+   http://www-3.ibm.com/chips/techlib/techlib.nsf/techdocs/89DED00DEBFF54BF87256A8000491BA2/$file/405CR_C_errata_1_2.pdf
+   http://ppc.bkbits.net:8080/linuxppc_2_4_devel/cset@1.489
+   http://www.kegel.com/xgcc3/ppc405erratum77.html
+   FIXME: using dbct instead of sync would be faster  */
+#define __LIBC_PPC405_ERR77_SYNC   "sync \n\t"
+#else
+#define __LIBC_PPC405_ERR77_SYNC
+#endif
+
 static __ATOMICITY_INLINE int
 __attribute__ ((unused))
 exchange_and_add (volatile uint32_t *mem, int val)
@@ -36,6 +47,7 @@
   __asm__ ("\n\
 0:	lwarx	%0,0,%2	\n\
 	add%I3	%1,%0,%3	\n\
+	" __LIBC_PPC405_ERR77_SYNC "\n\
 	stwcx.	%1,0,%2	\n\
 	bne-	0b	\n\
 " : "=&b"(result), "=&r"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory");
@@ -50,6 +62,7 @@
   __asm__ ("\n\
 0:	lwarx	%0,0,%1	\n\
 	add%I2	%0,%0,%2	\n\
+	" __LIBC_PPC405_ERR77_SYNC "\n\
 	stwcx.	%0,0,%1	\n\
 	bne-	0b	\n\
 " : "=&b"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory");
@@ -65,6 +78,7 @@
 	sub%I2c.	%0,%0,%2	\n\
 	cntlzw	%0,%0	\n\
 	bne-	1f	\n\
+	" __LIBC_PPC405_ERR77_SYNC "\n\
 	stwcx.	%3,0,%1	\n\
 	bne-	0b	\n\
 1:	\n\
@@ -79,6 +93,7 @@
   long int result;
   __asm__ ("\n\
 0:	lwarx	%0,0,%1	\n\
+	" __LIBC_PPC405_ERR77_SYNC "\n\
 	stwcx.	%2,0,%1	\n\
 	bne-	0b	\n\
 " : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory");
@@ -94,6 +109,7 @@
 0:	lwarx	%0,0,%1	\n\
 	cmpwi	%0,0	\n\
 	bne-	1f	\n\
+	" __LIBC_PPC405_ERR77_SYNC "\n\
 	stwcx.	%2,0,%1	\n\
 	bne-	0b	\n\
 1:	\n\