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dd09c36159
POWER ISA 3.0 adds CA32 and OV32 status in 64-bit mode. Add the flags
and corresponding defines.
Moreover, CA32 is updated when CA is updated and OV32 is updated when OV
is updated.
Arithmetic instructions:
* Addition and Substractions:
addic, addic., subfic, addc, subfc, adde, subfe, addme, subfme,
addze, and subfze always updates CA and CA32.
=> CA reflects the carry out of bit 0 in 64-bit mode and out of
bit 32 in 32-bit mode.
=> CA32 reflects the carry out of bit 32 independent of the
mode.
=> SO and OV reflects overflow of the 64-bit result in 64-bit
mode and overflow of the low-order 32-bit result in 32-bit
mode
=> OV32 reflects overflow of the low-order 32-bit independent of
the mode
* Multiply Low and Divide:
For mulld, divd, divde, divdu and divdeu: SO, OV, and OV32 bits
reflects overflow of the 64-bit result
For mullw, divw, divwe, divwu and divweu: SO, OV, and OV32 bits
reflects overflow of the 32-bit result
* Negate with OE=1 (nego)
For 64-bit mode if the register RA contains
0x8000_0000_0000_0000, OV and OV32 are set to 1.
For 32-bit mode if the register RA contains 0x8000_0000, OV and
OV32 are set to 1.
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
/*
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* PowerPC CPU routines for qemu.
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*
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* Copyright (c) 2017 Nikunj A Dadhania, IBM Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "cpu-models.h"
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target_ulong cpu_read_xer(CPUPPCState *env)
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{
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if (is_isa300(env)) {
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return env->xer | (env->so << XER_SO) |
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(env->ov << XER_OV) | (env->ca << XER_CA) |
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(env->ov32 << XER_OV32) | (env->ca32 << XER_CA32);
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}
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return env->xer | (env->so << XER_SO) | (env->ov << XER_OV) |
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(env->ca << XER_CA);
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}
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void cpu_write_xer(CPUPPCState *env, target_ulong xer)
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{
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env->so = (xer >> XER_SO) & 1;
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env->ov = (xer >> XER_OV) & 1;
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env->ca = (xer >> XER_CA) & 1;
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/* write all the flags, while reading back check of isa300 */
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env->ov32 = (xer >> XER_OV32) & 1;
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env->ca32 = (xer >> XER_CA32) & 1;
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env->xer = xer & ~((1ul << XER_SO) |
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(1ul << XER_OV) | (1ul << XER_CA) |
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(1ul << XER_OV32) | (1ul << XER_CA32));
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}
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