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patches/glibc/2.9/530-powerpc-8xx-CPU15-errata.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun Jan 17 23:06:02 2010 +0100 (2010-01-17)
changeset 1740 c57458bb354d
parent 1016 a059741f7bd4
permissions -rw-r--r--
configure: do not require hg when configuring in an hg clone

When configuring in an hg clone, we need hg to compute the version string.
It can happen that users do not have Mercurial (eg. if they got a snapshot
rather that they did a full clone). In this case, we can still run, of
course, so simply fill the version string with a sufficiently explicit
value, that does not require hg. The date is a good candidate. 
     1 Fix memset on PowerPC 8xx, by Nye Liu:

     2 http://sourceware.org/ml/crossgcc/2008-10/msg00067.html

     3 

     4 Quote:

     5  I am working on a powerpc 860 toolchain, but I am having problems  

     6  convincing glibc to not emit code that uses the dcbz instruction (CPU15  

     7  dcbX bug). The source of the problem is sysdeps/powerpc/power3/memset.S

     8 

     9 --- glibc-2.7/sysdeps/powerpc/powerpc32/memset.S	2007-03-26 13:09:07.000000000 -0700

    10 +++ glibc-2.7/sysdeps/powerpc/powerpc32/memset.S.new	2008-10-23 20:28:52.000000000 -0700

    11 @@ -112,11 +112,13 @@

    12  	clrrwi.	rALIGN, rLEN, 5

    13  	mtcrf	0x01, rLEN	/* 40th instruction from .align */

    14  

    15 +#ifndef BROKEN_PPC_8xx_CPU15

    16  /* Check if we can use the special case for clearing memory using dcbz.

    17     This requires that we know the correct cache line size for this

    18     processor.  Getting the __cache_line_size may require establishing GOT

    19     addressability, so branch out of line to set this up.  */

    20  	beq	cr1, L(checklinesize)

    21 +#endif

    22  

    23  /* Store blocks of 32-bytes (256-bits) starting on a 32-byte boundary.

    24     Can't assume that rCHR is zero or that the cache line size is either

    25 @@ -158,6 +160,7 @@

    26  	add	rMEMP, rMEMP, rALIGN

    27  	b	L(medium_tail2)	/* 72nd instruction from .align */

    28  

    29 +#ifndef BROKEN_PPC_8xx_CPU15

    30  	.align	5

    31  	nop

    32  /* Clear cache lines of memory in 128-byte chunks.

    33 @@ -191,6 +194,7 @@

    34  	bdnz	L(zloop)

    35  	beqlr	cr5

    36  	b	L(medium_tail2)

    37 +#endif /* ! BROKEN_PPC_8xx_CPU15 */

    38  

    39  	.align	5

    40  L(small):

    41 @@ -248,6 +252,7 @@

    42  	stw	rCHR, -8(rMEMP)

    43  	blr

    44  

    45 +#ifndef BROKEN_PPC_8xx_CPU15

    46  L(checklinesize):

    47  #ifdef SHARED

    48  	mflr	rTMP

    49 @@ -329,6 +334,7 @@

    50  L(handletail32):

    51  	clrrwi.	rALIGN, rLEN, 5

    52  	b	L(nondcbz)

    53 +#endif /* ! BROKEN_PPC_8xx_CPU15 */

    54  

    55  END (BP_SYM (memset))

    56  libc_hidden_builtin_def (memset)
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