gdb and binutils branch master updated. b4ab4364239efcf0cec74e89a85d844d628138c0

[amodra@sourceware.org]

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=b4ab4364239efcf0cec74e89a85d844d628138c0

commit b4ab4364239efcf0cec74e89a85d844d628138c0
Author: Alan Modra <amodra@gmail.com>
Date:   Sat Apr 5 17:55:13 2014 +1030

    ppc476 icache workaround fix for bctr
    
    I got the ppc476 workaround wrong.  bctr (and bctrl) as the last
    instruction in a page can hit the icache bug if the preceding mtctr
    insn is close by, and the destination is in the first few instructions
    on the next page.  This scenario can occur with code generated by gcc
    to implement switch statements, or in code generated to call by
    function pointer.
    
    To prevent the bctr problem it is also necessary to remove other
    instructions that otherwise would be safe.
    
    bfd/
    	* elf32-ppc.c (ppc_elf_relocate_section): Remove bctr from list
    	of safe ppc476 insns at end of page.  Also remove non-branch insns.
    	Expand comments.
    ld/
    	* emultempl/ppc32elf.em (no_zero_padding, ppc_finish): New functions.
    	(LDEMUL_FINISH): Define.

-----------------------------------------------------------------------

Summary of changes:
 bfd/ChangeLog            |    6 ++++
 bfd/elf32-ppc.c          |   67 +++++++++++++++++++++++++++++++++-------------
 ld/ChangeLog             |    5 +++
 ld/emultempl/ppc32elf.em |   41 ++++++++++++++++++++++++++++
 4 files changed, 100 insertions(+), 19 deletions(-)


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