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MIPS: R2-on-R6 MULTU/MADDU/MSUBU emulation bugfix

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commit d65e5677ad upstream.

MIPS instructions MULTU, MADDU and MSUBU emulation requires registers HI/LO
to be converted to signed 32bits before 64bit sign extension on MIPS64.

Bug was found on running MIPS32 R2 test application on MIPS64 R6 kernel.

Fixes: b0a668fb20 ("MIPS: kernel: mips-r2-to-r6-emul: Add R2 emulator for MIPS R6")
Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Reported-by: Nikola.Veljkovic@imgtec.com
Cc: paul.burton@imgtec.com
Cc: yamada.masahiro@socionext.com
Cc: akpm@linux-foundation.org
Cc: andrea.gelmini@gelma.net
Cc: macro@imgtec.com
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14043/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Leonid Yegoshin
2016-08-25 10:37:38 -07:00
committed by Greg Kroah-Hartman
parent 304b69247e
commit 0112db0b9a
1 changed files with 6 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
arch/mips/kernel/mips-r2-to-r6-emul.c
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@@ -434,8 +434,8 @@ static int multu_func(struct pt_regs *regs, u32 ir)
rs = regs->regs[MIPSInst_RS(ir)];
res = (u64)rt * (u64)rs;
rt = res;
regs->lo = (s64)rt;
regs->hi = (s64)(res >> 32);
regs->lo = (s64)(s32)rt;
regs->hi = (s64)(s32)(res >> 32);
MIPS_R2_STATS(muls);
@@ -671,9 +671,9 @@ static int maddu_func(struct pt_regs *regs, u32 ir)
res += ((((s64)rt) << 32) | (u32)rs);
rt = res;
regs->lo = (s64)rt;
regs->lo = (s64)(s32)rt;
rs = res >> 32;
regs->hi = (s64)rs;
regs->hi = (s64)(s32)rs;
MIPS_R2_STATS(dsps);
@@ -729,9 +729,9 @@ static int msubu_func(struct pt_regs *regs, u32 ir)
res = ((((s64)rt) << 32) | (u32)rs) - res;
rt = res;
regs->lo = (s64)rt;
regs->lo = (s64)(s32)rt;
rs = res >> 32;
regs->hi = (s64)rs;
regs->hi = (s64)(s32)rs;
MIPS_R2_STATS(dsps);