From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Markos Chandras , linux-mips@linux-mips.org, Ralf Baechle Subject: [PATCH 4.1 010/159] MIPS: math-emu: Emulate missing BC1{EQ,NE}Z instructions Date: Sat, 26 Sep 2015 13:54:16 -0700 Message-Id: <20150926205313.980749749@linuxfoundation.org> In-Reply-To: <20150926205313.363686083@linuxfoundation.org> References: <20150926205313.363686083@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Markos Chandras 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 Fixes: c8a34581ec09 ("MIPS: Emulate the BC1{EQ,NE}Z FPU instructions") Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/10738/ Signed-off-by: Ralf Baechle Signed-off-by: Greg Kroah-Hartman --- 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) { /*