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 b6540cf..0af29ce 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