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patches/glibc/ports-2.10.1/120-i386-x86_64-revert-clone-cfi.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Wed Dec 30 15:36:22 2009 +0100 (2009-12-30)
changeset 1669 61edd9d19e3c
permissions -rw-r--r--
scripts/functions: add aria2, a powerfull downloader

aria2 is a powerfull downloader that is capable of chunking and
parallel retrieval.

Due to li;itations in crosstool-NG retrieval facilities, it's not possible
to take fully advantage of aria2. It might happen that, in the future,
those limitations get lifted away, so we can take use features such as
parallel downloading from more than one server at the same time. For now,
it should still speed up downloads thanks to parallel downloading of chunks. 
     1 revert cfi additions to clone on i386/x86_64 to workaround problems in

     2 gcc's unwinder code.  this is not a bug in glibc, it triggers problems

     3 elsewhere.  this cfi code does not gain us a whole lot anyways.

     4 

     5 http://gcc.gnu.org/ml/gcc/2006-12/msg00293.html

     6 

     7 Index: sysdeps/unix/sysv/linux/i386/clone.S

     8 ===================================================================

     9 RCS file: /cvs/glibc/libc/sysdeps/unix/sysv/linux/i386/clone.S,v

    10 retrieving revision 1.27

    11 retrieving revision 1.26

    12 diff -u -p -r1.27 -r1.26

    13 

    14 diff -durN glibc-2.10.1.orig/sysdeps/unix/sysv/linux/i386/clone.S glibc-2.10.1/sysdeps/unix/sysv/linux/i386/clone.S

    15 --- glibc-2.10.1.orig/sysdeps/unix/sysv/linux/i386/clone.S	2006-12-04 00:12:36.000000000 +0100

    16 +++ glibc-2.10.1/sysdeps/unix/sysv/linux/i386/clone.S	2009-11-13 00:49:45.000000000 +0100

    17 @@ -120,9 +120,6 @@

    18  	ret

    19  

    20  L(thread_start):

    21 -	cfi_startproc;

    22 -	/* Clearing frame pointer is insufficient, use CFI.  */

    23 -	cfi_undefined (eip);

    24  	/* Note: %esi is zero.  */

    25  	movl	%esi,%ebp	/* terminate the stack frame */

    26  #ifdef RESET_PID

    27 @@ -155,7 +152,6 @@

    28  	jmp	L(haspid)

    29  	.previous

    30  #endif

    31 -	cfi_endproc;

    32  

    33  	cfi_startproc

    34  PSEUDO_END (BP_SYM (__clone))

    35 diff -durN glibc-2.10.1.orig/sysdeps/unix/sysv/linux/x86_64/clone.S glibc-2.10.1/sysdeps/unix/sysv/linux/x86_64/clone.S

    36 --- glibc-2.10.1.orig/sysdeps/unix/sysv/linux/x86_64/clone.S	2006-12-04 00:12:36.000000000 +0100

    37 +++ glibc-2.10.1/sysdeps/unix/sysv/linux/x86_64/clone.S	2009-11-13 00:49:45.000000000 +0100

    38 @@ -89,9 +89,6 @@

    39  	ret

    40  

    41  L(thread_start):

    42 -	cfi_startproc;

    43 -	/* Clearing frame pointer is insufficient, use CFI.  */

    44 -	cfi_undefined (rip);

    45  	/* Clear the frame pointer.  The ABI suggests this be done, to mark

    46  	   the outermost frame obviously.  */

    47  	xorl	%ebp, %ebp

    48 @@ -116,7 +113,6 @@

    49  	/* Call exit with return value from function call. */

    50  	movq	%rax, %rdi

    51  	call	HIDDEN_JUMPTARGET (_exit)

    52 -	cfi_endproc;

    53  

    54  	cfi_startproc;

    55  PSEUDO_END (BP_SYM (__clone))
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