MIPS: asm: asmmacro: Replace "add" instructions with "addu"

The "add" instruction is actually a macro in binutils and depending on
the size of the immediate it can expand to an "addi" instruction.
However, the "addi" instruction traps on overflows which is not
something we want on address calculation.

Link: http://www.linux-mips.org/archives/linux-mips/2015-01/msg00121.html
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: <stable@vger.kernel.org> # v3.15+
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>

diff --git a/arch/mips/include/asm/asmmacro.h b/arch/mips/include/asm/asmmacro.h
index b6540cfcc97bb96744c4d57c0a8c570e8db14141..0af29ce84e0b9520612586fb8aceadec2abe9be9 100644 (file)
--- a/arch/mips/include/asm/asmmacro.h
+++ b/arch/mips/include/asm/asmmacro.h
@@ -304,7 +304,7 @@
        .set    push
        .set    noat
        SET_HARDFLOAT
-       add     $1, \base, \off
+       addu    $1, \base, \off
        .word   LDD_MSA_INSN | (\wd << 6)
        .set    pop
        .endm
@@ -313,7 +313,7 @@
        .set    push
        .set    noat
        SET_HARDFLOAT
-       add     $1, \base, \off
+       addu    $1, \base, \off
        .word   STD_MSA_INSN | (\wd << 6)
        .set    pop
        .endm