diff options
| author | Anton Blanchard <anton@samba.org> | 2017-06-15 09:46:39 +1000 |
|---|---|---|
| committer | Sasha Levin <alexander.levin@verizon.com> | 2017-09-10 10:59:15 -0400 |
| commit | 726f177c91c5185155e5c5cd79cab05bc247a6fd (patch) | |
| tree | 0b647aebcc11bcb9b7a34d83e2aea294b8bae638 /arch/powerpc | |
| parent | fb556d250a6ee8d4a55ee3c4f3a3527487f85472 (diff) | |
powerpc: Fix emulation of mfocrf in emulate_step()
[ Upstream commit 64e756c55aa46fc18fd53e8f3598b73b528d8637 ]
From POWER4 onwards, mfocrf() only places the specified CR field into
the destination GPR, and the rest of it is set to 0. The PowerPC AS
from version 3.0 now requires this behaviour.
The emulation code currently puts the entire CR into the destination GPR.
Fix it.
Fixes: 6888199f7fe5 ("[POWERPC] Emulate more instructions in software")
Cc: stable@vger.kernel.org # v2.6.22+
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/lib/sstep.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index 8bf5c0bf9795..e37162d356d8 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -969,6 +969,19 @@ int __kprobes analyse_instr(struct instruction_op *op, struct pt_regs *regs, #endif case 19: /* mfcr */ + if ((instr >> 20) & 1) { + imm = 0xf0000000UL; + for (sh = 0; sh < 8; ++sh) { + if (instr & (0x80000 >> sh)) { + regs->gpr[rd] = regs->ccr & imm; + break; + } + imm >>= 4; + } + + goto instr_done; + } + regs->gpr[rd] = regs->ccr; regs->gpr[rd] &= 0xffffffffUL; goto instr_done; |