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patches/eglibc/2_9/100-powerpc-8xx-CPU15-errata.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Tue Dec 13 23:32:39 2011 +0100 (2011-12-13)
changeset 2807 4193d6e6a174
permissions -rw-r--r--
scripts: fix dumping execution backtrace

Dumping the backtrace has been broken since changeset #652e56d6d35a:
scripts: execute each steps in a subshell

We can spawn sub-sub-shells in some cases.

The way the fault handler works is to dump the backtrace, but to avoid
printing it once for every sub-shell (which could get quite confusing),
it simply exits when it detects that it is being run in a sub-shell,
leaving to the top-level shell the work to dump the backtrace.

Because each step is executed in its own sub-shell, the variable arrays
that contain the step name, the source file and line number, are lost
when exiting the per-step sub-shell.

Hence, the backtrace is currently limited to printing only the top-level
main procedure of the shell.

Fix this thus:
- when dumping the bckatraces for the steps & the functions, remember
it was dumped, and only dump it if it was not already dumped
- at the top-level shell, print the hints

Also, rename the top-level step label.

Reported-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> 
     1 diff -ru eglibc-2_9_orig/sysdeps/powerpc/powerpc32/memset.S eglibc-2_9/sysdeps/powerpc/powerpc32/memset.S

     2 --- eglibc-2_9_orig/sysdeps/powerpc/powerpc32/memset.S	2007-04-13 08:35:45.000000000 -0700

     3 +++ eglibc-2_9/sysdeps/powerpc/powerpc32/memset.S	2009-05-06 16:52:04.000000000 -0700

     4 @@ -112,11 +112,13 @@

     5  	clrrwi.	rALIGN, rLEN, 5

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

     7  

     8 +#ifndef BROKEN_PPC_8xx_CPU15

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

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

    11     processor.  Getting the __cache_line_size may require establishing GOT

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

    13  	beq	cr1, L(checklinesize)

    14 +#endif

    15  

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

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

    18 @@ -158,6 +160,7 @@

    19  	add	rMEMP, rMEMP, rALIGN

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

    21  

    22 +#ifndef BROKEN_PPC_8xx_CPU15

    23  	.align	5

    24  	nop

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

    26 @@ -191,6 +194,7 @@

    27  	bdnz	L(zloop)

    28  	beqlr	cr5

    29  	b	L(medium_tail2)

    30 +#endif /* ! BROKEN_PPC_8xx_CPU15 */

    31  

    32  	.align	5

    33  L(small):

    34 @@ -248,6 +252,7 @@

    35  	stw	rCHR, -8(rMEMP)

    36  	blr

    37  

    38 +#ifndef BROKEN_PPC_8xx_CPU15

    39  L(checklinesize):

    40  #ifdef SHARED

    41  	mflr	rTMP

    42 @@ -329,6 +334,7 @@

    43  L(handletail32):

    44  	clrrwi.	rALIGN, rLEN, 5

    45  	b	L(nondcbz)

    46 +#endif /* ! BROKEN_PPC_8xx_CPU15 */

    47  

    48  END (BP_SYM (memset))

    49  libc_hidden_builtin_def (memset)
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