This is a note to let you know that I've just added the patch titled MIPS: math-emu: Emulate missing BC1{EQ,NE}Z instructions to the 4.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mips-math-emu-emulate-missing-bc1-eq-ne-z-instructions.patch and it can be found in the queue-4.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From c909ca718e8f50cf484ef06a8dd935e738e8e53d Mon Sep 17 00:00:00 2001 From: Markos Chandras <markos.chandras@xxxxxxxxxx> Date: Fri, 17 Jul 2015 10:38:32 +0100 Subject: MIPS: math-emu: Emulate missing BC1{EQ,NE}Z instructions From: Markos Chandras <markos.chandras@xxxxxxxxxx> commit c909ca718e8f50cf484ef06a8dd935e738e8e53d upstream. Commit c8a34581ec09 ("MIPS: Emulate the BC1{EQ,NE}Z FPU instructions") added support for emulating the new R6 BC1{EQ,NE}Z branches but it missed the case where the instruction that caused the exception was not on a DS. Signed-off-by: Markos Chandras <markos.chandras@xxxxxxxxxx> Fixes: c8a34581ec09 ("MIPS: Emulate the BC1{EQ,NE}Z FPU instructions") Cc: linux-mips@xxxxxxxxxxxxxx Patchwork: https://patchwork.linux-mips.org/patch/10738/ Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/mips/math-emu/cp1emu.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) --- a/arch/mips/math-emu/cp1emu.c +++ b/arch/mips/math-emu/cp1emu.c @@ -1181,6 +1181,24 @@ emul: } break; + case bc1eqz_op: + case bc1nez_op: + if (!cpu_has_mips_r6 || delay_slot(xcp)) + return SIGILL; + + cond = likely = 0; + switch (MIPSInst_RS(ir)) { + case bc1eqz_op: + if (get_fpr32(¤t->thread.fpu.fpr[MIPSInst_RT(ir)], 0) & 0x1) + cond = 1; + break; + case bc1nez_op: + if (!(get_fpr32(¤t->thread.fpu.fpr[MIPSInst_RT(ir)], 0) & 0x1)) + cond = 1; + break; + } + goto branch_common; + case bc_op: if (delay_slot(xcp)) return SIGILL; @@ -1207,7 +1225,7 @@ emul: case bct_op: break; } - +branch_common: set_delay_slot(xcp); if (cond) { /* Patches currently in stable-queue which might be from markos.chandras@xxxxxxxxxx are queue-4.1/mips-math-emu-allow-m-f-t-hc-emulation-on-mips-r6.patch queue-4.1/mips-math-emu-emulate-missing-bc1-eq-ne-z-instructions.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html