gdb and binutils branch master updated. 5446cbdf82892a800ed7eef563a795e75223ec52

[amodra at sourceware dot org]

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=5446cbdf82892a800ed7eef563a795e75223ec52

commit 5446cbdf82892a800ed7eef563a795e75223ec52
Author: Alan Modra <amodra@gmail.com>
Date:   Thu Jan 30 08:26:02 2014 +1030

    ppc476 icache bug workaround
    
    This implements a work-around for an icache bug on 476 that can cause
    execution of stale instructions when control falls through from one
    page to the next.  The idea is to prevent such fall-through by
    replacing the last instruction on a page with a branch to a patch
    area containing the instruction, then branch to the next page.
    
    The patch also fixes a number of bugs in the existing support for long
    branch trampolines.
    
    bfd/
    	* elf32-ppc.c (struct ppc_elf_link_hash_table): Add params.
    	Delete emit_stub_syms, no_tls_get_addr_opt.  Update all uses.
    	(ppc_elf_link_params): New function.
    	(ppc_elf_create_glink): Align .glink to 64 bytes for ppc476
    	workaround.
    	(ppc_elf_select_plt_layout): Remove plt_style and emit_stub_syms
    	parameters.  Use htab->params instead.
    	(ppc_elf_tls_setup): Remove no_tls_get_addr_opt parameter.
    	(ppc_elf_size_dynamic_sections): Align __glink_PLTresolve to
    	64 bytes for ppc476 workaround.
    	(struct ppc_elf_relax_info): New.
    	(ppc_elf_relax_section): Exclude linker created sections and
    	those too small to hold one instruction.  Don't add another
    	branch 	around trampolines on later relax passes.  Don't
    	generate trampolines for undefined symbols when !relocatable,
    	nor for plugin symbols.  Allocate space for ppc476 workaround
    	patch area.  Free fixups on error return path.
    	(ppc_elf_relocate_section): Handle ppc476 workaround patching.
    	* elf32-ppc.h (struct ppc_elf_params): New.
    	(ppc_elf_select_plt_layout, ppc_elf_tls_setup): Update prototype.
    	(ppc_elf_link_params): Declare.
    	* section.c (SEC_INFO_TYPE_TARGET): Define.
    	* bfd-in2.h: Regenerate.
    ld/
    	* emultempl/ppc32elf.em (no_tls_get_addr_opt, emit_stub_syms)
    	plt_style): Delete.  Adjust all refs to instead use..
    	(params): ..this.  New variable.
    	(ppc_after_open_output): New function.  Tweak params and pass to
    	ppc_elf_link_params.
    	(ppc_after_open): Adjust ppc_elf_select_plt_layout call.
    	(ppc_before_allocation): Adjust ppc_elf_tls_setup call.  Enable
    	relaxation for ppc476 workaround.
    	(PARSE_AND_LIST_*): Add --{no-,}ppc476-workaround support.
    	(LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS): Define.

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

Summary of changes:
 bfd/ChangeLog            |   26 ++
 bfd/bfd-in2.h            |    1 +
 bfd/elf32-ppc.c          |  884 +++++++++++++++++++++++++++++-----------------
 bfd/elf32-ppc.h          |   26 ++-
 bfd/section.c            |    1 +
 ld/ChangeLog             |   13 +
 ld/emultempl/ppc32elf.em |   78 +++--
 7 files changed, 681 insertions(+), 348 deletions(-)


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