[Bug libc/21548] [mips] get/set/make/swap context for MIPS O32 assume wrong size for general purpose registers in mcontext_t structure

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https://sourceware.org/bugzilla/show_bug.cgi?id=21548

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b309f058cf7639951bebb86270ffbc116ea5f720

commit b309f058cf7639951bebb86270ffbc116ea5f720
Author: Gordana Cmiljanovic <Gordana.Cmiljanovic@imgtec.com>
Date:   Tue Jun 13 21:34:45 2017 +0000

    mips: Fix store/load gp registers to/from ucontext_t

    General purpose registers in mcontext_t structure
    are 8 bytes long for both MIPS32/MIPS64.

    get/set/make/swap context implementations for MIPS O32
    incorrectly assume that general purpose registers
    in this structure are 4 bytes long.

    This patch is fixing that.

    Tested for MIPS O32 LE and BE.
    Compared objdump of modified functions for mips n32 and mips n64.

        [BZ #21548]
        * sysdeps/unix/sysv/linux/mips/getcontext.S: Define MCONTEXT_SZGREG as
        8 and use it when copying general purpose registers.
        * sysdeps/unix/sysv/linux/mips/makecontext.S: Likewise.
        * sysdeps/unix/sysv/linux/mips/mips32/Makefile: Include new test for
        mips o32.
        * sysdeps/unix/sysv/linux/mips/mips32/bug-getcontext-mips-gp.c: Added
        new test for mips o32.
        * sysdeps/unix/sysv/linux/mips/setcontext.S: Define MCONTEXT_SZGREG as
        8 and use it when copying general purpose registers.
        * sysdeps/unix/sysv/linux/mips/swapcontext.S: Likewise.

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

Summary of changes:
 ChangeLog                                          |   14 ++++
 sysdeps/unix/sysv/linux/mips/getcontext.S          |   37 ++++++----
 sysdeps/unix/sysv/linux/mips/makecontext.S         |   27 +++++--
 sysdeps/unix/sysv/linux/mips/mips32/Makefile       |    4 +
 .../linux/mips/mips32/bug-getcontext-mips-gp.c     |   59 +++++++--------
 sysdeps/unix/sysv/linux/mips/setcontext.S          |   51 +++++++------
 sysdeps/unix/sysv/linux/mips/swapcontext.S         |   79 +++++++++++---------
 7 files changed, 157 insertions(+), 114 deletions(-)
 copy elf/tst-auxv.c =>
sysdeps/unix/sysv/linux/mips/mips32/bug-getcontext-mips-gp.c (51%)

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