gdb and binutils branch binutils-2_24-branch updated. f47b0fc7eea01174073535c9ff0d1a79f045f93a

[amodra@sourceware.org]

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=f47b0fc7eea01174073535c9ff0d1a79f045f93a

commit f47b0fc7eea01174073535c9ff0d1a79f045f93a
Author: Alan Modra <amodra@gmail.com>
Date:   Fri Mar 7 10:14:30 2014 +1030

    Better overflow checking for powerpc64 relocations
    
    R_PPC64_ADDR16 is used in three contexts:
    - .short data relocation
    - 16-bit signed insn fields, eg. addi
    - 16-bit unsigned insn fields, eg. ori
    In the first case we want to allow both signed and unsigned 16-bit
    values, the latter two ought to error if the field exceeds the range
    of values allowed for 16-bit signed and unsigned integers
    respectively.  These conflicting requirements meant that ld had to
    choose the least restrictive overflow checks, and thus it is possible
    to construct testcases where an addi field overflows but is not
    reported by ld.  Many relocations dealing with 16-bit insn fields have
    this problem.  What's more, some relocations that are only ever used
    for signed fields of instructions woodenly copied the lax overflow
    checking of R_PPC64_ADDR16.
    
    bfd/
    	* elf64-ppc.c (ppc64_elf_howto_raw): Use complain_overflow_signed
    	for R_PPC64_ADDR14, R_PPC64_ADDR14_BRTAKEN, R_PPC64_ADDR14_BRNTAKEN,
    	R_PPC64_SECTOFF, R_PPC64_ADDR16_DS, R_PPC64_SECTOFF_DS,
    	R_PPC64_REL16 entries.  Use complain_overflow_dont for R_PPC64_TOC.
    	(ppc64_elf_relocate_section): Modify overflow test for 16-bit
    	fields in instructions to signed/unsigned according to whether
    	the field takes a signed or unsigned value.
    gold/
    	* powerpc.cc (Powerpc_relocate_functions::Overflow_check): Add
    	CHECK_UNSIGNED, CHECK_LOW_INSN, CHECK_HIGH_INSN.
    	(Powerpc_relocate_functions::has_overflow_unsigned): New function.
    	(Powerpc_relocate_functions::has_overflow_bitfield,
    	overflowed): Use the above.
    	(Target_powerpc::Relocate::relocate): Correct overflow checking
    	for a number of relocations.  Modify overflow test for 16-bit
    	fields in instructions to signed/unsigned according to whether
    	the field takes a signed or unsigned value.

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

Summary of changes:
 bfd/ChangeLog   |    9 ++++++
 bfd/elf64-ppc.c |   64 ++++++++++++++++++++++++++++-------------
 gold/ChangeLog  |   14 +++++++++
 gold/powerpc.cc |   84 +++++++++++++++++++++++++++++++++++++++++++------------
 4 files changed, 133 insertions(+), 38 deletions(-)


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