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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>
Sun Sep 12 23:38:18 2010 +0200 (2010-09-12)
changeset 2120 48de021b3a9e
permissions -rw-r--r--
arch/mips: add experimental mips64 samples

Both toolchains were tested to successfully:
- _build_ busybox, giving respectively an n32 and an n64 binary
although it has not been run-tested.
- build linux-2.6.36-rc3 for Loongson, giving an n64 vmlinux
(which is expected, due to the way the kernel is built),
and the kernel properly boots!

Credits are due to Julien MOUTHINO (julm on freenode#uClibc) for
testing that the kernel boots on his hardware! Cheers! ;-)

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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