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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>
Mon Aug 23 23:18:49 2010 +0200 (2010-08-23)
changeset 2099 1bb063c8a0ca
permissions -rw-r--r--
complibs: noone is using companion libs on the target; nuke them

As there's no longer any user of the companion libraries on the
target, nuke the build for the target.

Well, at least, there's libelf that's still needed by ltrace, so
we keep it.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> 
     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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