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