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 glibc
yann@1: 
yann@1: diff -aur glibc-2.2.5.orig/linuxthreads/sysdeps/powerpc/pt-machine.h glibc-2.2.5/linuxthreads/sysdeps/powerpc/pt-machine.h
yann@1: --- glibc-2.2.5.orig/linuxthreads/sysdeps/powerpc/pt-machine.h	Thu May 17 12:47:46 2001
yann@1: +++ glibc-2.2.5/linuxthreads/sysdeps/powerpc/pt-machine.h	Tue Jul 23 05:38:24 2002
yann@1: @@ -41,6 +41,17 @@
yann@1:  #define HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS
yann@1:  #define IMPLEMENT_TAS_WITH_CAS
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 __LINUXTHREADS_PPC405_ERR77_SYNC   "sync \n\t"
yann@1: +#else
yann@1: +#define __LINUXTHREADS_PPC405_ERR77_SYNC
yann@1: +#endif
yann@1: +
yann@1:  PT_EI int
yann@1:  __compare_and_swap (long int *p, long int oldval, long int newval)
yann@1:  {
yann@1: @@ -50,6 +61,7 @@
yann@1:  	   "0:    lwarx %0,0,%1 ;"
yann@1:  	   "      xor. %0,%3,%0;"
yann@1:  	   "      bne 1f;"
yann@1: +	   __LINUXTHREADS_PPC405_ERR77_SYNC
yann@1:  	   "      stwcx. %2,0,%1;"
yann@1:  	   "      bne- 0b;"
yann@1:  	   "1:    "
yann@1: