yann@1: # see http://bugs.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=4155
yann@1: # and http://www.kegel.com/xgcc3/ppc405erratum77.html
yann@1: # See also matching patch for linuxthreads
yann@1: 
yann@1: diff -aur glibc-2.2.5.orig/sysdeps/powerpc/atomicity.h glibc-2.2.5/sysdeps/powerpc/atomicity.h
yann@1: --- glibc-2.2.5.orig/sysdeps/powerpc/atomicity.h	Thu Jul  5 21:56:01 2001
yann@1: +++ glibc-2.2.5/sysdeps/powerpc/atomicity.h	Tue Jul 23 05:39:38 2002
yann@1: @@ -28,6 +28,17 @@
yann@1:  # define __ATOMICITY_INLINE inline
yann@1:  #endif
yann@1:  
yann@1: +#ifdef __PPC405__
yann@1: +/* workaround for PPC405 erratum #77 - Mark Hatle, dank.  References:
yann@1: +   http://www-3.ibm.com/chips/techlib/techlib.nsf/techdocs/89DED00DEBFF54BF87256A8000491BA2/$file/405CR_C_errata_1_2.pdf
yann@1: +   http://ppc.bkbits.net:8080/linuxppc_2_4_devel/cset@1.489
yann@1: +   http://www.kegel.com/xgcc3/ppc405erratum77.html
yann@1: +   FIXME: using dbct instead of sync would be faster  */
yann@1: +#define __LIBC_PPC405_ERR77_SYNC   "sync \n\t"
yann@1: +#else
yann@1: +#define __LIBC_PPC405_ERR77_SYNC
yann@1: +#endif
yann@1: +
yann@1:  static __ATOMICITY_INLINE int
yann@1:  __attribute__ ((unused))
yann@1:  exchange_and_add (volatile uint32_t *mem, int val)
yann@1: @@ -36,6 +47,7 @@
yann@1:    __asm__ ("\n\
yann@1:  0:	lwarx	%0,0,%2	\n\
yann@1:  	add%I3	%1,%0,%3	\n\
yann@1: +	" __LIBC_PPC405_ERR77_SYNC "\n\
yann@1:  	stwcx.	%1,0,%2	\n\
yann@1:  	bne-	0b	\n\
yann@1:  " : "=&b"(result), "=&r"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory");
yann@1: @@ -50,6 +62,7 @@
yann@1:    __asm__ ("\n\
yann@1:  0:	lwarx	%0,0,%1	\n\
yann@1:  	add%I2	%0,%0,%2	\n\
yann@1: +	" __LIBC_PPC405_ERR77_SYNC "\n\
yann@1:  	stwcx.	%0,0,%1	\n\
yann@1:  	bne-	0b	\n\
yann@1:  " : "=&b"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory");
yann@1: @@ -65,6 +78,7 @@
yann@1:  	sub%I2c.	%0,%0,%2	\n\
yann@1:  	cntlzw	%0,%0	\n\
yann@1:  	bne-	1f	\n\
yann@1: +	" __LIBC_PPC405_ERR77_SYNC "\n\
yann@1:  	stwcx.	%3,0,%1	\n\
yann@1:  	bne-	0b	\n\
yann@1:  1:	\n\
yann@1: @@ -79,6 +93,7 @@
yann@1:    long int result;
yann@1:    __asm__ ("\n\
yann@1:  0:	lwarx	%0,0,%1	\n\
yann@1: +	" __LIBC_PPC405_ERR77_SYNC "\n\
yann@1:  	stwcx.	%2,0,%1	\n\
yann@1:  	bne-	0b	\n\
yann@1:  " : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory");
yann@1: @@ -94,6 +109,7 @@
yann@1:  0:	lwarx	%0,0,%1	\n\
yann@1:  	cmpwi	%0,0	\n\
yann@1:  	bne-	1f	\n\
yann@1: +	" __LIBC_PPC405_ERR77_SYNC "\n\
yann@1:  	stwcx.	%2,0,%1	\n\
yann@1:  	bne-	0b	\n\
yann@1:  1:	\n\