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patches/glibc/2.9/160-i386-x86_64-revert-clone-cfi.patch
author "Benoît THÉBAUDEAU" <benoit.thebaudeau@advansee.com>
Wed May 25 20:23:48 2011 +0200 (2011-05-25)
branch1.11
changeset 2552 cc285cc98e65
parent 1201 c9967a6e3b25
permissions -rw-r--r--
debug/gdb: fix runtime sysroot

This patch sets the runtime sysroot to fix the following GDB warning:
"Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code."

The sysroot can later be changed within gdb with the `set sysroot`
command if necessary.

Signed-off-by: "Benoît THÉBAUDEAU" <benoit.thebaudeau@advansee.com>
(transplanted from 7690196856ce4a4700d1887cc3adf80acc627c52) 
     1 Original patch from: gentoo/src/patchsets/glibc/2.9/0070_all_glibc-i386-x86_64-revert-clone-cfi.patch

     2 

     3 -= BEGIN original header =-

     4 revert cfi additions to clone on i386/x86_64 to workaround problems in

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

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

     7 

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

     9 

    10 -= END original header =-

    11 

    12 diff -durN glibc-2_9.orig/sysdeps/unix/sysv/linux/i386/clone.S glibc-2_9/sysdeps/unix/sysv/linux/i386/clone.S

    13 --- glibc-2_9.orig/sysdeps/unix/sysv/linux/i386/clone.S	2006-12-04 00:12:36.000000000 +0100

    14 +++ glibc-2_9/sysdeps/unix/sysv/linux/i386/clone.S	2009-02-02 22:00:45.000000000 +0100

    15 @@ -120,9 +120,6 @@

    16  	ret

    17  

    18  L(thread_start):

    19 -	cfi_startproc;

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

    21 -	cfi_undefined (eip);

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

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

    24  #ifdef RESET_PID

    25 @@ -155,7 +152,6 @@

    26  	jmp	L(haspid)

    27  	.previous

    28  #endif

    29 -	cfi_endproc;

    30  

    31  	cfi_startproc

    32  PSEUDO_END (BP_SYM (__clone))

    33 diff -durN glibc-2_9.orig/sysdeps/unix/sysv/linux/x86_64/clone.S glibc-2_9/sysdeps/unix/sysv/linux/x86_64/clone.S

    34 --- glibc-2_9.orig/sysdeps/unix/sysv/linux/x86_64/clone.S	2006-12-04 00:12:36.000000000 +0100

    35 +++ glibc-2_9/sysdeps/unix/sysv/linux/x86_64/clone.S	2009-02-02 22:00:45.000000000 +0100

    36 @@ -89,9 +89,6 @@

    37  	ret

    38  

    39  L(thread_start):

    40 -	cfi_startproc;

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

    42 -	cfi_undefined (rip);

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

    44  	   the outermost frame obviously.  */

    45  	xorl	%ebp, %ebp

    46 @@ -116,7 +113,6 @@

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

    48  	movq	%rax, %rdi

    49  	call	HIDDEN_JUMPTARGET (_exit)

    50 -	cfi_endproc;

    51  

    52  	cfi_startproc;

    53  PSEUDO_END (BP_SYM (__clone))
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