target/s390x/cpu.c - qemu - Git at Google

 /*
  * QEMU S/390 CPU
  *
  * Copyright (c) 2009 Ulrich Hecht
  * Copyright (c) 2011 Alexander Graf
  * Copyright (c) 2012 SUSE LINUX Products GmbH
  * Copyright (c) 2012 IBM Corp.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */

 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "cpu.h"
 #include "s390x-internal.h"
 #include "kvm/kvm_s390x.h"
 #include "sysemu/kvm.h"
 #include "sysemu/reset.h"
 #include "qemu/module.h"
 #include "trace.h"
 #include "qapi/qapi-types-machine.h"
 #include "sysemu/hw_accel.h"
 #include "hw/qdev-properties.h"
 #include "fpu/softfloat-helpers.h"
 #include "disas/capstone.h"
 #include "sysemu/tcg.h"

 #define CR0_RESET       0xE0UL
 #define CR14_RESET      0xC2000000UL;

 void s390_cpu_set_psw(CPUS390XState *env, uint64_t mask, uint64_t addr)
 {
 #ifndef CONFIG_USER_ONLY
     uint64_t old_mask = env->psw.mask;
 #endif

     env->psw.addr = addr;
     env->psw.mask = mask;

     /* KVM will handle all WAITs and trigger a WAIT exit on disabled_wait */
     if (!tcg_enabled()) {
         return;
     }
     env->cc_op = (mask >> 44) & 3;

 #ifndef CONFIG_USER_ONLY
     if ((old_mask ^ mask) & PSW_MASK_PER) {
         s390_cpu_recompute_watchpoints(env_cpu(env));
     }

     if (mask & PSW_MASK_WAIT) {
         s390_handle_wait(env_archcpu(env));
     }
 #endif
 }

 uint64_t s390_cpu_get_psw_mask(CPUS390XState *env)
 {
     uint64_t r = env->psw.mask;

     if (tcg_enabled()) {
         uint64_t cc = calc_cc(env, env->cc_op, env->cc_src,
                               env->cc_dst, env->cc_vr);

         assert(cc <= 3);
         r &= ~PSW_MASK_CC;
         r |= cc << 44;
     }

     return r;
 }

 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
 {
     S390CPU *cpu = S390_CPU(cs);

     cpu->env.psw.addr = value;
 }

 static bool s390_cpu_has_work(CPUState *cs)
 {
     S390CPU *cpu = S390_CPU(cs);

     /* STOPPED cpus can never wake up */
     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD &&
         s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
         return false;
     }

     if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
         return false;
     }

     return s390_cpu_has_int(cpu);
 }

 /* S390CPUClass::reset() */
 static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
 {
     S390CPU *cpu = S390_CPU(s);
     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
     CPUS390XState *env = &cpu->env;
     DeviceState *dev = DEVICE(s);

     scc->parent_reset(dev);
     cpu->env.sigp_order = 0;
     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);

     switch (type) {
     case S390_CPU_RESET_CLEAR:
         memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
         /* fall through */
     case S390_CPU_RESET_INITIAL:
         /* initial reset does not clear everything! */
         memset(&env->start_initial_reset_fields, 0,
                offsetof(CPUS390XState, start_normal_reset_fields) -
                offsetof(CPUS390XState, start_initial_reset_fields));

         /* architectured initial value for Breaking-Event-Address register */
         env->gbea = 1;

         /* architectured initial values for CR 0 and 14 */
         env->cregs[0] = CR0_RESET;
         env->cregs[14] = CR14_RESET;

 #if defined(CONFIG_USER_ONLY)
         /* user mode should always be allowed to use the full FPU */
         env->cregs[0] |= CR0_AFP;
         if (s390_has_feat(S390_FEAT_VECTOR)) {
             env->cregs[0] |= CR0_VECTOR;
         }
 #endif

         /* tininess for underflow is detected before rounding */
         set_float_detect_tininess(float_tininess_before_rounding,
                                   &env->fpu_status);
        /* fall through */
     case S390_CPU_RESET_NORMAL:
         env->psw.mask &= ~PSW_MASK_RI;
         memset(&env->start_normal_reset_fields, 0,
                offsetof(CPUS390XState, end_reset_fields) -
                offsetof(CPUS390XState, start_normal_reset_fields));

         env->pfault_token = -1UL;
         env->bpbc = false;
         break;
     default:
         g_assert_not_reached();
     }

     /* Reset state inside the kernel that we cannot access yet from QEMU. */
     if (kvm_enabled()) {
         switch (type) {
         case S390_CPU_RESET_CLEAR:
             kvm_s390_reset_vcpu_clear(cpu);
             break;
         case S390_CPU_RESET_INITIAL:
             kvm_s390_reset_vcpu_initial(cpu);
             break;
         case S390_CPU_RESET_NORMAL:
             kvm_s390_reset_vcpu_normal(cpu);
             break;
         }
     }
 }

 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 {
     info->mach = bfd_mach_s390_64;
     info->print_insn = print_insn_s390;
     info->cap_arch = CS_ARCH_SYSZ;
     info->cap_insn_unit = 2;
     info->cap_insn_split = 6;
 }

 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 {
     CPUState *cs = CPU(dev);
     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
     Error *err = NULL;

     /* the model has to be realized before qemu_init_vcpu() due to kvm */
     s390_realize_cpu_model(cs, &err);
     if (err) {
         goto out;
     }

 #if !defined(CONFIG_USER_ONLY)
     if (!s390_cpu_realize_sysemu(dev, &err)) {
         goto out;
     }
 #endif

     cpu_exec_realizefn(cs, &err);
     if (err != NULL) {
         goto out;
     }

 #if !defined(CONFIG_USER_ONLY)
     qemu_register_reset(s390_cpu_machine_reset_cb, S390_CPU(dev));
 #endif
     s390_cpu_gdb_init(cs);
     qemu_init_vcpu(cs);

     /*
      * KVM requires the initial CPU reset ioctl to be executed on the target
      * CPU thread. CPU hotplug under single-threaded TCG will not work with
      * run_on_cpu(), as run_on_cpu() will not work properly if called while
      * the main thread is already running but the CPU hasn't been realized.
      */
     if (kvm_enabled()) {
         run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
     } else {
         cpu_reset(cs);
     }

     scc->parent_realize(dev, &err);
 out:
     error_propagate(errp, err);
 }

 static void s390_cpu_initfn(Object *obj)
 {
     CPUState *cs = CPU(obj);
     S390CPU *cpu = S390_CPU(obj);

     cpu_set_cpustate_pointers(cpu);
     cs->exception_index = EXCP_HLT;

 #if !defined(CONFIG_USER_ONLY)
     s390_cpu_init_sysemu(obj);
 #endif
 }

 static gchar *s390_gdb_arch_name(CPUState *cs)
 {
     return g_strdup("s390:64-bit");
 }

 static Property s390x_cpu_properties[] = {
 #if !defined(CONFIG_USER_ONLY)
     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 #endif
     DEFINE_PROP_END_OF_LIST()
 };

 static void s390_cpu_reset_full(DeviceState *dev)
 {
     CPUState *s = CPU(dev);
     return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
 }

 #ifdef CONFIG_TCG
 #include "hw/core/tcg-cpu-ops.h"

 static const struct TCGCPUOps s390_tcg_ops = {
     .initialize = s390x_translate_init,

 #ifdef CONFIG_USER_ONLY
     .record_sigsegv = s390_cpu_record_sigsegv,
     .record_sigbus = s390_cpu_record_sigbus,
 #else
     .tlb_fill = s390_cpu_tlb_fill,
     .cpu_exec_interrupt = s390_cpu_exec_interrupt,
     .do_interrupt = s390_cpu_do_interrupt,
     .debug_excp_handler = s390x_cpu_debug_excp_handler,
     .do_unaligned_access = s390x_cpu_do_unaligned_access,
 #endif /* !CONFIG_USER_ONLY */
 };
 #endif /* CONFIG_TCG */

 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 {
     S390CPUClass *scc = S390_CPU_CLASS(oc);
     CPUClass *cc = CPU_CLASS(scc);
     DeviceClass *dc = DEVICE_CLASS(oc);

     device_class_set_parent_realize(dc, s390_cpu_realizefn,
                                     &scc->parent_realize);
     device_class_set_props(dc, s390x_cpu_properties);
     dc->user_creatable = true;

     device_class_set_parent_reset(dc, s390_cpu_reset_full, &scc->parent_reset);

     scc->reset = s390_cpu_reset;
     cc->class_by_name = s390_cpu_class_by_name,
     cc->has_work = s390_cpu_has_work;
     cc->dump_state = s390_cpu_dump_state;
     cc->set_pc = s390_cpu_set_pc;
     cc->gdb_read_register = s390_cpu_gdb_read_register;
     cc->gdb_write_register = s390_cpu_gdb_write_register;
 #ifndef CONFIG_USER_ONLY
     s390_cpu_class_init_sysemu(cc);
 #endif
     cc->disas_set_info = s390_cpu_disas_set_info;
     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
     cc->gdb_core_xml_file = "s390x-core64.xml";
     cc->gdb_arch_name = s390_gdb_arch_name;

     s390_cpu_model_class_register_props(oc);

 #ifdef CONFIG_TCG
     cc->tcg_ops = &s390_tcg_ops;
 #endif /* CONFIG_TCG */
 }

 static const TypeInfo s390_cpu_type_info = {
     .name = TYPE_S390_CPU,
     .parent = TYPE_CPU,
     .instance_size = sizeof(S390CPU),
     .instance_align = __alignof__(S390CPU),
     .instance_init = s390_cpu_initfn,

 #ifndef CONFIG_USER_ONLY
     .instance_finalize = s390_cpu_finalize,
 #endif /* !CONFIG_USER_ONLY */

     .abstract = true,
     .class_size = sizeof(S390CPUClass),
     .class_init = s390_cpu_class_init,
 };

 static void s390_cpu_register_types(void)
 {
     type_register_static(&s390_cpu_type_info);
 }

 type_init(s390_cpu_register_types)
	/*
	* QEMU S/390 CPU
	*
	* Copyright (c) 2009 Ulrich Hecht
	* Copyright (c) 2011 Alexander Graf
	* Copyright (c) 2012 SUSE LINUX Products GmbH
	* Copyright (c) 2012 IBM Corp.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	*/

	#include "qemu/osdep.h"
	#include "qapi/error.h"
	#include "cpu.h"
	#include "s390x-internal.h"
	#include "kvm/kvm_s390x.h"
	#include "sysemu/kvm.h"
	#include "sysemu/reset.h"
	#include "qemu/module.h"
	#include "trace.h"
	#include "qapi/qapi-types-machine.h"
	#include "sysemu/hw_accel.h"
	#include "hw/qdev-properties.h"
	#include "fpu/softfloat-helpers.h"
	#include "disas/capstone.h"
	#include "sysemu/tcg.h"

	#define CR0_RESET 0xE0UL
	#define CR14_RESET 0xC2000000UL;

	void s390_cpu_set_psw(CPUS390XState *env, uint64_t mask, uint64_t addr)
	{
	#ifndef CONFIG_USER_ONLY
	uint64_t old_mask = env->psw.mask;
	#endif

	env->psw.addr = addr;
	env->psw.mask = mask;

	/* KVM will handle all WAITs and trigger a WAIT exit on disabled_wait */
	if (!tcg_enabled()) {
	return;
	}
	env->cc_op = (mask >> 44) & 3;

	#ifndef CONFIG_USER_ONLY
	if ((old_mask ^ mask) & PSW_MASK_PER) {
	s390_cpu_recompute_watchpoints(env_cpu(env));
	}

	if (mask & PSW_MASK_WAIT) {
	s390_handle_wait(env_archcpu(env));
	}
	#endif
	}

	uint64_t s390_cpu_get_psw_mask(CPUS390XState *env)
	{
	uint64_t r = env->psw.mask;

	if (tcg_enabled()) {
	uint64_t cc = calc_cc(env, env->cc_op, env->cc_src,
	env->cc_dst, env->cc_vr);

	assert(cc <= 3);
	r &= ~PSW_MASK_CC;
	r \|= cc << 44;
	}

	return r;
	}

	static void s390_cpu_set_pc(CPUState *cs, vaddr value)
	{
	S390CPU *cpu = S390_CPU(cs);

	cpu->env.psw.addr = value;
	}

	static bool s390_cpu_has_work(CPUState *cs)
	{
	S390CPU *cpu = S390_CPU(cs);

	/* STOPPED cpus can never wake up */
	if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD &&
	s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
	return false;
	}

	if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
	return false;
	}

	return s390_cpu_has_int(cpu);
	}

	/* S390CPUClass::reset() */
	static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
	{
	S390CPU *cpu = S390_CPU(s);
	S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
	CPUS390XState *env = &cpu->env;
	DeviceState *dev = DEVICE(s);

	scc->parent_reset(dev);
	cpu->env.sigp_order = 0;
	s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);

	switch (type) {
	case S390_CPU_RESET_CLEAR:
	memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
	/* fall through */
	case S390_CPU_RESET_INITIAL:
	/* initial reset does not clear everything! */
	memset(&env->start_initial_reset_fields, 0,
	offsetof(CPUS390XState, start_normal_reset_fields) -
	offsetof(CPUS390XState, start_initial_reset_fields));

	/* architectured initial value for Breaking-Event-Address register */
	env->gbea = 1;

	/* architectured initial values for CR 0 and 14 */
	env->cregs[0] = CR0_RESET;
	env->cregs[14] = CR14_RESET;

	#if defined(CONFIG_USER_ONLY)
	/* user mode should always be allowed to use the full FPU */
	env->cregs[0] \|= CR0_AFP;
	if (s390_has_feat(S390_FEAT_VECTOR)) {
	env->cregs[0] \|= CR0_VECTOR;
	}
	#endif

	/* tininess for underflow is detected before rounding */
	set_float_detect_tininess(float_tininess_before_rounding,
	&env->fpu_status);
	/* fall through */
	case S390_CPU_RESET_NORMAL:
	env->psw.mask &= ~PSW_MASK_RI;
	memset(&env->start_normal_reset_fields, 0,
	offsetof(CPUS390XState, end_reset_fields) -
	offsetof(CPUS390XState, start_normal_reset_fields));

	env->pfault_token = -1UL;
	env->bpbc = false;
	break;
	default:
	g_assert_not_reached();
	}

	/* Reset state inside the kernel that we cannot access yet from QEMU. */
	if (kvm_enabled()) {
	switch (type) {
	case S390_CPU_RESET_CLEAR:
	kvm_s390_reset_vcpu_clear(cpu);
	break;
	case S390_CPU_RESET_INITIAL:
	kvm_s390_reset_vcpu_initial(cpu);
	break;
	case S390_CPU_RESET_NORMAL:
	kvm_s390_reset_vcpu_normal(cpu);
	break;
	}
	}
	}

	static void s390_cpu_disas_set_info(CPUState cpu, disassemble_info info)
	{
	info->mach = bfd_mach_s390_64;
	info->print_insn = print_insn_s390;
	info->cap_arch = CS_ARCH_SYSZ;
	info->cap_insn_unit = 2;
	info->cap_insn_split = 6;
	}

	static void s390_cpu_realizefn(DeviceState dev, Error *errp)
	{
	CPUState *cs = CPU(dev);
	S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
	Error *err = NULL;

	/* the model has to be realized before qemu_init_vcpu() due to kvm */
	s390_realize_cpu_model(cs, &err);
	if (err) {
	goto out;
	}

	#if !defined(CONFIG_USER_ONLY)
	if (!s390_cpu_realize_sysemu(dev, &err)) {
	goto out;
	}
	#endif

	cpu_exec_realizefn(cs, &err);
	if (err != NULL) {
	goto out;
	}

	#if !defined(CONFIG_USER_ONLY)
	qemu_register_reset(s390_cpu_machine_reset_cb, S390_CPU(dev));
	#endif
	s390_cpu_gdb_init(cs);
	qemu_init_vcpu(cs);

	/*
	* KVM requires the initial CPU reset ioctl to be executed on the target
	* CPU thread. CPU hotplug under single-threaded TCG will not work with
	* run_on_cpu(), as run_on_cpu() will not work properly if called while
	* the main thread is already running but the CPU hasn't been realized.
	*/
	if (kvm_enabled()) {
	run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
	} else {
	cpu_reset(cs);
	}

	scc->parent_realize(dev, &err);
	out:
	error_propagate(errp, err);
	}

	static void s390_cpu_initfn(Object *obj)
	{
	CPUState *cs = CPU(obj);
	S390CPU *cpu = S390_CPU(obj);

	cpu_set_cpustate_pointers(cpu);
	cs->exception_index = EXCP_HLT;

	#if !defined(CONFIG_USER_ONLY)
	s390_cpu_init_sysemu(obj);
	#endif
	}

	static gchar s390_gdb_arch_name(CPUState cs)
	{
	return g_strdup("s390:64-bit");
	}

	static Property s390x_cpu_properties[] = {
	#if !defined(CONFIG_USER_ONLY)
	DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
	#endif
	DEFINE_PROP_END_OF_LIST()
	};

	static void s390_cpu_reset_full(DeviceState *dev)
	{
	CPUState *s = CPU(dev);
	return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
	}

	#ifdef CONFIG_TCG
	#include "hw/core/tcg-cpu-ops.h"

	static const struct TCGCPUOps s390_tcg_ops = {
	.initialize = s390x_translate_init,

	#ifdef CONFIG_USER_ONLY
	.record_sigsegv = s390_cpu_record_sigsegv,
	.record_sigbus = s390_cpu_record_sigbus,
	#else
	.tlb_fill = s390_cpu_tlb_fill,
	.cpu_exec_interrupt = s390_cpu_exec_interrupt,
	.do_interrupt = s390_cpu_do_interrupt,
	.debug_excp_handler = s390x_cpu_debug_excp_handler,
	.do_unaligned_access = s390x_cpu_do_unaligned_access,
	#endif /* !CONFIG_USER_ONLY */
	};
	#endif /* CONFIG_TCG */

	static void s390_cpu_class_init(ObjectClass oc, void data)
	{
	S390CPUClass *scc = S390_CPU_CLASS(oc);
	CPUClass *cc = CPU_CLASS(scc);
	DeviceClass *dc = DEVICE_CLASS(oc);

	device_class_set_parent_realize(dc, s390_cpu_realizefn,
	&scc->parent_realize);
	device_class_set_props(dc, s390x_cpu_properties);
	dc->user_creatable = true;

	device_class_set_parent_reset(dc, s390_cpu_reset_full, &scc->parent_reset);

	scc->reset = s390_cpu_reset;
	cc->class_by_name = s390_cpu_class_by_name,
	cc->has_work = s390_cpu_has_work;
	cc->dump_state = s390_cpu_dump_state;
	cc->set_pc = s390_cpu_set_pc;
	cc->gdb_read_register = s390_cpu_gdb_read_register;
	cc->gdb_write_register = s390_cpu_gdb_write_register;
	#ifndef CONFIG_USER_ONLY
	s390_cpu_class_init_sysemu(cc);
	#endif
	cc->disas_set_info = s390_cpu_disas_set_info;
	cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
	cc->gdb_core_xml_file = "s390x-core64.xml";
	cc->gdb_arch_name = s390_gdb_arch_name;

	s390_cpu_model_class_register_props(oc);

	#ifdef CONFIG_TCG
	cc->tcg_ops = &s390_tcg_ops;
	#endif /* CONFIG_TCG */
	}

	static const TypeInfo s390_cpu_type_info = {
	.name = TYPE_S390_CPU,
	.parent = TYPE_CPU,
	.instance_size = sizeof(S390CPU),
	.instance_align = __alignof__(S390CPU),
	.instance_init = s390_cpu_initfn,

	#ifndef CONFIG_USER_ONLY
	.instance_finalize = s390_cpu_finalize,
	#endif /* !CONFIG_USER_ONLY */

	.abstract = true,
	.class_size = sizeof(S390CPUClass),
	.class_init = s390_cpu_class_init,
	};

	static void s390_cpu_register_types(void)
	{
	type_register_static(&s390_cpu_type_info);
	}

	type_init(s390_cpu_register_types)