patches/glibc/ports-2.10.1/120-i386-x86_64-revert-clone-cfi.patch
author Michael Hope <michael.hope@linaro.org>
Wed Oct 19 15:27:32 2011 +1300 (2011-10-19)
changeset 2739 f320e22f2cba
permissions -rw-r--r--
arch: add softfp support

Some architectures support a mixed hard/soft floating point, where
the compiler emits hardware floating point instructions, but passes
the operands in core (aka integer) registers.

For example, ARM supports this mode (to come in the next changeset).

Add support for softfp cross compilers to the GCC and GLIBC
configuration. Needed for Ubuntu and other distros that are softfp.

Signed-off-by: Michael Hope <michael.hope@linaro.org>
[yann.morin.1998@anciens.enib.fr: split the original patch]
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))