org.handhelds.familiar/packages/glibc/glibc-2.2.5/linuxthreads-2.2.5-ppc405erratum77.patch

   1 # see http://bugs.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=4155
   2 # and http://www.kegel.com/xgcc3/ppc405erratum77.html
   3 # See also matching patch for glibc
   4
   5 diff -aur glibc-2.2.5.orig/linuxthreads/sysdeps/powerpc/pt-machine.h glibc-2.2.5/linuxthreads/sysdeps/powerpc/pt-machine.h
   6 --- glibc-2.2.5.orig/linuxthreads/sysdeps/powerpc/pt-machine.h  Thu May 17 12:47:46 2001
   7 +++ glibc-2.2.5/linuxthreads/sysdeps/powerpc/pt-machine.h       Tue Jul 23 05:38:24 2002
   8 @@ -41,6 +41,17 @@
   9  #define HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS
  10  #define IMPLEMENT_TAS_WITH_CAS
  11
  12 +#ifdef __PPC405__
  13 +/* workaround for PPC405 erratum #77 - Mark Hatle, dank.  References:
  14 +   http://www-3.ibm.com/chips/techlib/techlib.nsf/techdocs/89DED00DEBFF54BF87256A8000491BA2/$file/405CR_C_errata_1_2.pdf
  15 +   http://ppc.bkbits.net:8080/linuxppc_2_4_devel/cset@1.489
  16 +   http://www.kegel.com/xgcc3/ppc405erratum77.html
  17 +   FIXME: using dbct instead of sync would be faster  */
  18 +#define __LINUXTHREADS_PPC405_ERR77_SYNC   "sync \n\t"
  19 +#else
  20 +#define __LINUXTHREADS_PPC405_ERR77_SYNC
  21 +#endif
  22 +
  23  PT_EI int
  24  __compare_and_swap (long int *p, long int oldval, long int newval)
  25  {
  26 @@ -50,6 +61,7 @@
  27            "0:    lwarx %0,0,%1 ;"
  28            "      xor. %0,%3,%0;"
  29            "      bne 1f;"
  30 +          __LINUXTHREADS_PPC405_ERR77_SYNC
  31            "      stwcx. %2,0,%1;"
  32            "      bne- 0b;"
  33            "1:    "
  34