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qemu/target/s390x/cpu.c
Richard Henderson 62613ca073 target/s390x: Record separate PER bits in TB flags 
Record successful-branching, instruction-fetching, and
store-using-real-address.  The other PER bits are not used
during translation.  Having checked these at translation time,
we can remove runtime tests from the helpers.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-ID: <20240502054417.234340-5-richard.henderson@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2024-05-29 12:41:15 +02:00

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/*
* 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 "qemu/module.h"
#include "trace.h"
#include "qapi/qapi-types-machine.h"
#include "sysemu/hw_accel.h"
#include "hw/qdev-properties.h"
#include "hw/qdev-properties-system.h"
#include "fpu/softfloat-helpers.h"
#include "disas/capstone.h"
#include "sysemu/tcg.h"
#ifndef CONFIG_USER_ONLY
#include "sysemu/reset.h"
#endif
#include "hw/s390x/cpu-topology.h"
#define CR0_RESET 0xE0UL
#define CR14_RESET 0xC2000000UL;
#ifndef CONFIG_USER_ONLY
static bool is_early_exception_psw(uint64_t mask, uint64_t addr)
{
if (mask & PSW_MASK_RESERVED) {
return true;
}
switch (mask & (PSW_MASK_32 | PSW_MASK_64)) {
case 0:
return addr & ~0xffffffULL;
case PSW_MASK_32:
return addr & ~0x7fffffffULL;
case PSW_MASK_32 | PSW_MASK_64:
return false;
default: /* PSW_MASK_64 */
return true;
}
}
#endif
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 (is_early_exception_psw(mask, addr)) {
env->int_pgm_ilen = 0;
trigger_pgm_exception(env, PGM_SPECIFICATION);
return;
}
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 vaddr s390_cpu_get_pc(CPUState *cs)
{
S390CPU *cpu = S390_CPU(cs);
return cpu->env.psw.addr;
}
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);
}
static int s390x_cpu_mmu_index(CPUState *cs, bool ifetch)
{
return s390x_env_mmu_index(cpu_env(cs), ifetch);
}
static void s390_query_cpu_fast(CPUState *cpu, CpuInfoFast *value)
{
S390CPU *s390_cpu = S390_CPU(cpu);
value->u.s390x.cpu_state = s390_cpu->env.cpu_state;
#if !defined(CONFIG_USER_ONLY)
if (s390_has_topology()) {
value->u.s390x.has_dedicated = true;
value->u.s390x.dedicated = s390_cpu->env.dedicated;
value->u.s390x.has_entitlement = true;
value->u.s390x.entitlement = s390_cpu->env.entitlement;
}
#endif
}
/* 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->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);
cs->exception_index = EXCP_HLT;
#if !defined(CONFIG_USER_ONLY)
s390_cpu_init_sysemu(obj);
#endif
}
static const gchar *s390_gdb_arch_name(CPUState *cs)
{
return "s390:64-bit";
}
static Property s390x_cpu_properties[] = {
#if !defined(CONFIG_USER_ONLY)
DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
DEFINE_PROP_INT32("socket-id", S390CPU, env.socket_id, -1),
DEFINE_PROP_INT32("book-id", S390CPU, env.book_id, -1),
DEFINE_PROP_INT32("drawer-id", S390CPU, env.drawer_id, -1),
DEFINE_PROP_BOOL("dedicated", S390CPU, env.dedicated, false),
DEFINE_PROP_CPUS390ENTITLEMENT("entitlement", S390CPU, env.entitlement,
S390_CPU_ENTITLEMENT_AUTO),
#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"
void cpu_get_tb_cpu_state(CPUS390XState *env, vaddr *pc,
uint64_t *cs_base, uint32_t *pflags)
{
uint32_t flags;
if (env->psw.addr & 1) {
/*
* Instructions must be at even addresses.
* This needs to be checked before address translation.
*/
env->int_pgm_ilen = 2; /* see s390_cpu_tlb_fill() */
tcg_s390_program_interrupt(env, PGM_SPECIFICATION, 0);
}
*pc = env->psw.addr;
*cs_base = env->ex_value;
flags = (env->psw.mask >> FLAG_MASK_PSW_SHIFT) & FLAG_MASK_PSW;
if (env->psw.mask & PSW_MASK_PER) {
flags |= env->cregs[9] & (FLAG_MASK_PER_BRANCH |
FLAG_MASK_PER_IFETCH |
FLAG_MASK_PER_IFETCH_NULLIFY);
if ((env->cregs[9] & PER_CR9_EVENT_STORE) &&
(env->cregs[9] & PER_CR9_EVENT_STORE_REAL)) {
flags |= FLAG_MASK_PER_STORE_REAL;
}
}
if (env->cregs[0] & CR0_AFP) {
flags |= FLAG_MASK_AFP;
}
if (env->cregs[0] & CR0_VECTOR) {
flags |= FLAG_MASK_VECTOR;
}
*pflags = flags;
}
static const TCGCPUOps s390_tcg_ops = {
.initialize = s390x_translate_init,
.restore_state_to_opc = s390x_restore_state_to_opc,
#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->mmu_index = s390x_cpu_mmu_index;
cc->dump_state = s390_cpu_dump_state;
cc->query_cpu_fast = s390_query_cpu_fast;
cc->set_pc = s390_cpu_set_pc;
cc->get_pc = s390_cpu_get_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_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)
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