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0c3c25fcda
The CPU object's start-powered-off property is currently only settable before the CPU object is realized. For arm machines this is awkward, because we would like to decide whether the CPU should be powered-off based on how we are booting the guest code, which is something done in the machine model code and in common code called by the machine model, which runs much later and in completely different parts of the codebase from the SoC object code that is responsible for creating and realizing the CPU objects. Allow start-powered-off to be set after realize. Since this isn't something that's supported by the DEFINE_PROP_* macros, we have to switch the property definition to use the object_class_property_add_bool() function. Note that it doesn't conceptually make sense to change the setting of the property after the machine has been completely initialized, beacuse this would mean that the behaviour of the machine when first started would differ from its behaviour when the system is subsequently reset. (It would also require the underlying state to be migrated, which we don't do.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Tested-by: Cédric Le Goater <clg@kaod.org> Message-id: 20220127154639.2090164-3-peter.maydell@linaro.org
480 lines
12 KiB
C
480 lines
12 KiB
C
/*
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* Target-specific parts of the CPU object
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*
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* Copyright (c) 2003 Fabrice Bellard
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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 "qemu-common.h"
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#include "qapi/error.h"
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#include "exec/target_page.h"
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#include "hw/qdev-core.h"
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#include "hw/qdev-properties.h"
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#include "qemu/error-report.h"
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#include "migration/vmstate.h"
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#ifdef CONFIG_USER_ONLY
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#include "qemu.h"
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#else
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#include "hw/core/sysemu-cpu-ops.h"
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#include "exec/address-spaces.h"
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#endif
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#include "sysemu/tcg.h"
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#include "sysemu/kvm.h"
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#include "sysemu/replay.h"
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#include "exec/translate-all.h"
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#include "exec/log.h"
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#include "hw/core/accel-cpu.h"
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#include "trace/trace-root.h"
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uintptr_t qemu_host_page_size;
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intptr_t qemu_host_page_mask;
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#ifndef CONFIG_USER_ONLY
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static int cpu_common_post_load(void *opaque, int version_id)
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{
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CPUState *cpu = opaque;
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/* 0x01 was CPU_INTERRUPT_EXIT. This line can be removed when the
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version_id is increased. */
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cpu->interrupt_request &= ~0x01;
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tlb_flush(cpu);
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/* loadvm has just updated the content of RAM, bypassing the
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* usual mechanisms that ensure we flush TBs for writes to
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* memory we've translated code from. So we must flush all TBs,
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* which will now be stale.
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*/
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tb_flush(cpu);
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return 0;
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}
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static int cpu_common_pre_load(void *opaque)
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{
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CPUState *cpu = opaque;
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cpu->exception_index = -1;
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return 0;
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}
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static bool cpu_common_exception_index_needed(void *opaque)
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{
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CPUState *cpu = opaque;
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return tcg_enabled() && cpu->exception_index != -1;
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}
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static const VMStateDescription vmstate_cpu_common_exception_index = {
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.name = "cpu_common/exception_index",
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.version_id = 1,
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.minimum_version_id = 1,
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.needed = cpu_common_exception_index_needed,
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.fields = (VMStateField[]) {
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VMSTATE_INT32(exception_index, CPUState),
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VMSTATE_END_OF_LIST()
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}
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};
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static bool cpu_common_crash_occurred_needed(void *opaque)
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{
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CPUState *cpu = opaque;
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return cpu->crash_occurred;
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}
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static const VMStateDescription vmstate_cpu_common_crash_occurred = {
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.name = "cpu_common/crash_occurred",
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.version_id = 1,
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.minimum_version_id = 1,
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.needed = cpu_common_crash_occurred_needed,
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.fields = (VMStateField[]) {
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VMSTATE_BOOL(crash_occurred, CPUState),
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VMSTATE_END_OF_LIST()
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}
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};
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const VMStateDescription vmstate_cpu_common = {
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.name = "cpu_common",
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.version_id = 1,
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.minimum_version_id = 1,
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.pre_load = cpu_common_pre_load,
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.post_load = cpu_common_post_load,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(halted, CPUState),
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VMSTATE_UINT32(interrupt_request, CPUState),
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VMSTATE_END_OF_LIST()
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},
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.subsections = (const VMStateDescription*[]) {
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&vmstate_cpu_common_exception_index,
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&vmstate_cpu_common_crash_occurred,
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NULL
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}
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};
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#endif
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void cpu_exec_realizefn(CPUState *cpu, Error **errp)
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{
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#ifndef CONFIG_USER_ONLY
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CPUClass *cc = CPU_GET_CLASS(cpu);
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#endif
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cpu_list_add(cpu);
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if (!accel_cpu_realizefn(cpu, errp)) {
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return;
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}
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/* NB: errp parameter is unused currently */
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if (tcg_enabled()) {
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tcg_exec_realizefn(cpu, errp);
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}
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#ifdef CONFIG_USER_ONLY
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assert(qdev_get_vmsd(DEVICE(cpu)) == NULL ||
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qdev_get_vmsd(DEVICE(cpu))->unmigratable);
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#else
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if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
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vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu);
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}
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if (cc->sysemu_ops->legacy_vmsd != NULL) {
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vmstate_register(NULL, cpu->cpu_index, cc->sysemu_ops->legacy_vmsd, cpu);
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}
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#endif /* CONFIG_USER_ONLY */
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}
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void cpu_exec_unrealizefn(CPUState *cpu)
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{
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#ifndef CONFIG_USER_ONLY
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CPUClass *cc = CPU_GET_CLASS(cpu);
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if (cc->sysemu_ops->legacy_vmsd != NULL) {
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vmstate_unregister(NULL, cc->sysemu_ops->legacy_vmsd, cpu);
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}
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if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
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vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
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}
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#endif
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if (tcg_enabled()) {
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tcg_exec_unrealizefn(cpu);
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}
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cpu_list_remove(cpu);
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}
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/*
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* This can't go in hw/core/cpu.c because that file is compiled only
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* once for both user-mode and system builds.
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*/
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static Property cpu_common_props[] = {
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#ifdef CONFIG_USER_ONLY
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/*
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* Create a property for the user-only object, so users can
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* adjust prctl(PR_SET_UNALIGN) from the command-line.
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* Has no effect if the target does not support the feature.
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*/
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DEFINE_PROP_BOOL("prctl-unalign-sigbus", CPUState,
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prctl_unalign_sigbus, false),
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#else
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/*
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* Create a memory property for softmmu CPU object, so users can
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* wire up its memory. The default if no link is set up is to use
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* the system address space.
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*/
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DEFINE_PROP_LINK("memory", CPUState, memory, TYPE_MEMORY_REGION,
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MemoryRegion *),
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#endif
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DEFINE_PROP_END_OF_LIST(),
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};
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static bool cpu_get_start_powered_off(Object *obj, Error **errp)
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{
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CPUState *cpu = CPU(obj);
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return cpu->start_powered_off;
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}
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static void cpu_set_start_powered_off(Object *obj, bool value, Error **errp)
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{
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CPUState *cpu = CPU(obj);
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cpu->start_powered_off = value;
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}
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void cpu_class_init_props(DeviceClass *dc)
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{
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ObjectClass *oc = OBJECT_CLASS(dc);
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device_class_set_props(dc, cpu_common_props);
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/*
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* We can't use DEFINE_PROP_BOOL in the Property array for this
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* property, because we want this to be settable after realize.
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*/
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object_class_property_add_bool(oc, "start-powered-off",
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cpu_get_start_powered_off,
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cpu_set_start_powered_off);
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}
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void cpu_exec_initfn(CPUState *cpu)
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{
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cpu->as = NULL;
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cpu->num_ases = 0;
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#ifndef CONFIG_USER_ONLY
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cpu->thread_id = qemu_get_thread_id();
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cpu->memory = get_system_memory();
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object_ref(OBJECT(cpu->memory));
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#endif
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}
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const char *parse_cpu_option(const char *cpu_option)
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{
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ObjectClass *oc;
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CPUClass *cc;
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gchar **model_pieces;
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const char *cpu_type;
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model_pieces = g_strsplit(cpu_option, ",", 2);
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if (!model_pieces[0]) {
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error_report("-cpu option cannot be empty");
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exit(1);
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}
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oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]);
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if (oc == NULL) {
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error_report("unable to find CPU model '%s'", model_pieces[0]);
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g_strfreev(model_pieces);
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exit(EXIT_FAILURE);
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}
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cpu_type = object_class_get_name(oc);
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cc = CPU_CLASS(oc);
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cc->parse_features(cpu_type, model_pieces[1], &error_fatal);
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g_strfreev(model_pieces);
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return cpu_type;
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}
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#if defined(CONFIG_USER_ONLY)
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void tb_invalidate_phys_addr(target_ulong addr)
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{
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mmap_lock();
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tb_invalidate_phys_page_range(addr, addr + 1);
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mmap_unlock();
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}
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#else
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void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs)
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{
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ram_addr_t ram_addr;
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MemoryRegion *mr;
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hwaddr l = 1;
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if (!tcg_enabled()) {
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return;
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}
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RCU_READ_LOCK_GUARD();
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mr = address_space_translate(as, addr, &addr, &l, false, attrs);
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if (!(memory_region_is_ram(mr)
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|| memory_region_is_romd(mr))) {
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return;
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}
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ram_addr = memory_region_get_ram_addr(mr) + addr;
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tb_invalidate_phys_page_range(ram_addr, ram_addr + 1);
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}
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#endif
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/* Add a breakpoint. */
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int cpu_breakpoint_insert(CPUState *cpu, vaddr pc, int flags,
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CPUBreakpoint **breakpoint)
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{
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CPUClass *cc = CPU_GET_CLASS(cpu);
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CPUBreakpoint *bp;
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if (cc->gdb_adjust_breakpoint) {
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pc = cc->gdb_adjust_breakpoint(cpu, pc);
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}
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bp = g_malloc(sizeof(*bp));
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bp->pc = pc;
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bp->flags = flags;
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/* keep all GDB-injected breakpoints in front */
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if (flags & BP_GDB) {
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QTAILQ_INSERT_HEAD(&cpu->breakpoints, bp, entry);
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} else {
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QTAILQ_INSERT_TAIL(&cpu->breakpoints, bp, entry);
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}
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if (breakpoint) {
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*breakpoint = bp;
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}
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trace_breakpoint_insert(cpu->cpu_index, pc, flags);
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return 0;
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}
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/* Remove a specific breakpoint. */
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int cpu_breakpoint_remove(CPUState *cpu, vaddr pc, int flags)
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{
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CPUClass *cc = CPU_GET_CLASS(cpu);
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CPUBreakpoint *bp;
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if (cc->gdb_adjust_breakpoint) {
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pc = cc->gdb_adjust_breakpoint(cpu, pc);
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}
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QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
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if (bp->pc == pc && bp->flags == flags) {
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cpu_breakpoint_remove_by_ref(cpu, bp);
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return 0;
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}
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}
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return -ENOENT;
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}
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/* Remove a specific breakpoint by reference. */
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void cpu_breakpoint_remove_by_ref(CPUState *cpu, CPUBreakpoint *bp)
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{
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QTAILQ_REMOVE(&cpu->breakpoints, bp, entry);
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trace_breakpoint_remove(cpu->cpu_index, bp->pc, bp->flags);
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g_free(bp);
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}
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/* Remove all matching breakpoints. */
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void cpu_breakpoint_remove_all(CPUState *cpu, int mask)
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{
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CPUBreakpoint *bp, *next;
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QTAILQ_FOREACH_SAFE(bp, &cpu->breakpoints, entry, next) {
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if (bp->flags & mask) {
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cpu_breakpoint_remove_by_ref(cpu, bp);
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}
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}
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}
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/* enable or disable single step mode. EXCP_DEBUG is returned by the
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CPU loop after each instruction */
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void cpu_single_step(CPUState *cpu, int enabled)
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{
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if (cpu->singlestep_enabled != enabled) {
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cpu->singlestep_enabled = enabled;
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if (kvm_enabled()) {
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kvm_update_guest_debug(cpu, 0);
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}
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trace_breakpoint_singlestep(cpu->cpu_index, enabled);
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}
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}
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void cpu_abort(CPUState *cpu, const char *fmt, ...)
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{
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va_list ap;
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va_list ap2;
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va_start(ap, fmt);
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va_copy(ap2, ap);
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fprintf(stderr, "qemu: fatal: ");
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\n");
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cpu_dump_state(cpu, stderr, CPU_DUMP_FPU | CPU_DUMP_CCOP);
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if (qemu_log_separate()) {
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FILE *logfile = qemu_log_lock();
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qemu_log("qemu: fatal: ");
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qemu_log_vprintf(fmt, ap2);
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qemu_log("\n");
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log_cpu_state(cpu, CPU_DUMP_FPU | CPU_DUMP_CCOP);
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qemu_log_flush();
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qemu_log_unlock(logfile);
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qemu_log_close();
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}
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va_end(ap2);
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va_end(ap);
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replay_finish();
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#if defined(CONFIG_USER_ONLY)
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{
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struct sigaction act;
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sigfillset(&act.sa_mask);
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act.sa_handler = SIG_DFL;
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act.sa_flags = 0;
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sigaction(SIGABRT, &act, NULL);
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}
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#endif
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abort();
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}
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/* physical memory access (slow version, mainly for debug) */
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#if defined(CONFIG_USER_ONLY)
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int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
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void *ptr, target_ulong len, bool is_write)
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{
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int flags;
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target_ulong l, page;
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void * p;
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uint8_t *buf = ptr;
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while (len > 0) {
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page = addr & TARGET_PAGE_MASK;
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l = (page + TARGET_PAGE_SIZE) - addr;
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if (l > len)
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l = len;
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flags = page_get_flags(page);
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if (!(flags & PAGE_VALID))
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return -1;
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if (is_write) {
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if (!(flags & PAGE_WRITE))
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return -1;
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/* XXX: this code should not depend on lock_user */
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if (!(p = lock_user(VERIFY_WRITE, addr, l, 0)))
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return -1;
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memcpy(p, buf, l);
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unlock_user(p, addr, l);
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} else {
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if (!(flags & PAGE_READ))
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return -1;
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/* XXX: this code should not depend on lock_user */
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if (!(p = lock_user(VERIFY_READ, addr, l, 1)))
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return -1;
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memcpy(buf, p, l);
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unlock_user(p, addr, 0);
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}
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len -= l;
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buf += l;
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addr += l;
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}
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return 0;
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}
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#endif
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bool target_words_bigendian(void)
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{
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#if defined(TARGET_WORDS_BIGENDIAN)
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return true;
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#else
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return false;
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#endif
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}
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void page_size_init(void)
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{
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/* NOTE: we can always suppose that qemu_host_page_size >=
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TARGET_PAGE_SIZE */
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if (qemu_host_page_size == 0) {
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qemu_host_page_size = qemu_real_host_page_size;
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}
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if (qemu_host_page_size < TARGET_PAGE_SIZE) {
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qemu_host_page_size = TARGET_PAGE_SIZE;
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}
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qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
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}
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