crosstool-ng: patches/glibc/2.7/290-powerpc-8xx-CPU15-errata.patch@b6eec1274efb

     1 Fix memset on PowerPC 8xx, by Nye Liu:

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

     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

     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 12:20:04.000000000 -0700

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

    12  	clrrwi.	rALIGN, rLEN, 5

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

    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

    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 @@ -248,6 +250,7 @@

    26  	stw	rCHR, -8(rMEMP)

    27  	blr

    29 +#ifndef BROKEN_PPC_8xx_CPU15

    30  L(checklinesize):

    31  #ifdef SHARED

    32  	mflr	rTMP

    33 @@ -329,6 +332,7 @@

    34  L(handletail32):

    35  	clrrwi.	rALIGN, rLEN, 5

    36  	b	L(nondcbz)

    37 +#endif /* ! BROKEN_PPC_8xx_CPU15 */

    39  END (BP_SYM (memset))

    40  libc_hidden_builtin_def (memset)

author	"Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
	Thu Oct 23 21:12:29 2008 +0000 (2008-10-23)
changeset 966	b6eec1274efb
child 1016	a059741f7bd4
permissions	-rw-r--r--