memset: fix crash with linaro 4.9.1 toolchain

Squashed commit of the following:

commit cc8a8772c8d439e377f94ac33d70d33dd6517f5b
Author: Nicolas Pitre <nicolas.pitre@linaro.org>
Date:   Tue Mar 12 13:00:42 2013 +0100

    ARM: 7670/1: fix the memset fix

    Commit 455bd4c430b0 ("ARM: 7668/1: fix memset-related crashes caused by
    recent GCC (4.7.2) optimizations") attempted to fix a compliance issue
    with the memset return value.  However the memset itself became broken
    by that patch for misaligned pointers.

    This fixes the above by branching over the entry code from the
    misaligned fixup code to avoid reloading the original pointer.

    Also, because the function entry alignment is wrong in the Thumb mode
    compilation, that fixup code is moved to the end.

    While at it, the entry instructions are slightly reworked to help dual
    issue pipelines.

    Signed-off-by: Nicolas Pitre <nico@linaro.org>
    Tested-by: Alexander Holler <holler@ahsoftware.de>
    Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

commit 3e410cd159a2107ccf5be41d54b4d0634f6d9254
Author: Ivan Djelic <ivan.djelic@parrot.com>
Date:   Wed Mar 6 20:09:27 2013 +0100

    ARM: 7668/1: fix memset-related crashes caused by recent GCC (4.7.2) optimizations

    Recent GCC versions (e.g. GCC-4.7.2) perform optimizations based on
    assumptions about the implementation of memset and similar functions.
    The current ARM optimized memset code does not return the value of
    its first argument, as is usually expected from standard implementations.

    For instance in the following function:

    void debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter)
    {
    	memset(waiter, MUTEX_DEBUG_INIT, sizeof(*waiter));
    	waiter->magic = waiter;
    	INIT_LIST_HEAD(&waiter->list);
    }

    compiled as:

    800554d0 <debug_mutex_lock_common>:
    800554d0:       e92d4008        push    {r3, lr}
    800554d4:       e1a00001        mov     r0, r1
    800554d8:       e3a02010        mov     r2, #16 ; 0x10
    800554dc:       e3a01011        mov     r1, #17 ; 0x11
    800554e0:       eb04426e        bl      80165ea0 <memset>
    800554e4:       e1a03000        mov     r3, r0
    800554e8:       e583000c        str     r0, [r3, #12]
    800554ec:       e5830000        str     r0, [r3]
    800554f0:       e5830004        str     r0, [r3, #4]
    800554f4:       e8bd8008        pop     {r3, pc}

    GCC assumes memset returns the value of pointer 'waiter' in register r0; causing
    register/memory corruptions.

    This patch fixes the return value of the assembly version of memset.
    It adds a 'mov' instruction and merges an additional load+store into
    existing load/store instructions.
    For ease of review, here is a breakdown of the patch into 4 simple steps:

    Step 1
    ======
    Perform the following substitutions:
    ip -> r8, then
    r0 -> ip,
    and insert 'mov ip, r0' as the first statement of the function.
    At this point, we have a memset() implementation returning the proper result,
    but corrupting r8 on some paths (the ones that were using ip).

    Step 2
    ======
    Make sure r8 is saved and restored when (! CALGN(1)+0) == 1:

    save r8:
    -       str     lr, [sp, #-4]!
    +       stmfd   sp!, {r8, lr}

    and restore r8 on both exit paths:
    -       ldmeqfd sp!, {pc}               @ Now <64 bytes to go.
    +       ldmeqfd sp!, {r8, pc}           @ Now <64 bytes to go.
    (...)
            tst     r2, #16
            stmneia ip!, {r1, r3, r8, lr}
    -       ldr     lr, [sp], #4
    +       ldmfd   sp!, {r8, lr}

    Step 3
    ======
    Make sure r8 is saved and restored when (! CALGN(1)+0) == 0:

    save r8:
    -       stmfd   sp!, {r4-r7, lr}
    +       stmfd   sp!, {r4-r8, lr}

    and restore r8 on both exit paths:
            bgt     3b
    -       ldmeqfd sp!, {r4-r7, pc}
    +       ldmeqfd sp!, {r4-r8, pc}
    (...)
            tst     r2, #16
            stmneia ip!, {r4-r7}
    -       ldmfd   sp!, {r4-r7, lr}
    +       ldmfd   sp!, {r4-r8, lr}

    Step 4
    ======
    Rewrite register list "r4-r7, r8" as "r4-r8".

    Signed-off-by: Ivan Djelic <ivan.djelic@parrot.com>
    Reviewed-by: Nicolas Pitre <nico@linaro.org>
    Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
    Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

Signed-off-by: Shubhang <shubhang92@gmail.com>