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qemu-e2k/target/s390x/helper.c
David Hildenbrand b3a184f51f s390x: load_psw() should only exchange the PSW for KVM 
Let's simplify it a bit. On some weird circumstances we would have
tried to recompute watchpoints when running under KVM. load_psw() is
called from do_restart_interrupt() during a SIGP RESTART if the target
CPU is STOPPED. Let's touch watchpoints only in the TCG case - where
they are used for PER emulation.

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180409113019.14568-3-david@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
2018-04-09 13:59:06 +02:00

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/*
* S/390 helpers
*
* Copyright (c) 2009 Ulrich Hecht
* Copyright (c) 2011 Alexander Graf
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "internal.h"
#include "exec/gdbstub.h"
#include "qemu/timer.h"
#include "exec/exec-all.h"
#include "hw/s390x/ioinst.h"
#include "sysemu/hw_accel.h"
#ifndef CONFIG_USER_ONLY
#include "sysemu/sysemu.h"
#endif
#ifndef CONFIG_USER_ONLY
void s390x_tod_timer(void *opaque)
{
cpu_inject_clock_comparator((S390CPU *) opaque);
}
void s390x_cpu_timer(void *opaque)
{
cpu_inject_cpu_timer((S390CPU *) opaque);
}
#endif
#ifndef CONFIG_USER_ONLY
hwaddr s390_cpu_get_phys_page_debug(CPUState *cs, vaddr vaddr)
{
S390CPU *cpu = S390_CPU(cs);
CPUS390XState *env = &cpu->env;
target_ulong raddr;
int prot;
uint64_t asc = env->psw.mask & PSW_MASK_ASC;
/* 31-Bit mode */
if (!(env->psw.mask & PSW_MASK_64)) {
vaddr &= 0x7fffffff;
}
if (mmu_translate(env, vaddr, MMU_INST_FETCH, asc, &raddr, &prot, false)) {
return -1;
}
return raddr;
}
hwaddr s390_cpu_get_phys_addr_debug(CPUState *cs, vaddr vaddr)
{
hwaddr phys_addr;
target_ulong page;
page = vaddr & TARGET_PAGE_MASK;
phys_addr = cpu_get_phys_page_debug(cs, page);
phys_addr += (vaddr & ~TARGET_PAGE_MASK);
return phys_addr;
}
static inline bool is_special_wait_psw(uint64_t psw_addr)
{
/* signal quiesce */
return psw_addr == 0xfffUL;
}
void s390_handle_wait(S390CPU *cpu)
{
CPUState *cs = CPU(cpu);
if (s390_cpu_halt(cpu) == 0) {
#ifndef CONFIG_USER_ONLY
if (is_special_wait_psw(cpu->env.psw.addr)) {
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
} else {
cpu->env.crash_reason = S390_CRASH_REASON_DISABLED_WAIT;
qemu_system_guest_panicked(cpu_get_crash_info(cs));
}
#endif
}
}
void load_psw(CPUS390XState *env, uint64_t mask, uint64_t addr)
{
uint64_t old_mask = env->psw.mask;
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;
if ((old_mask ^ mask) & PSW_MASK_PER) {
s390_cpu_recompute_watchpoints(CPU(s390_env_get_cpu(env)));
}
if (mask & PSW_MASK_WAIT) {
s390_handle_wait(s390_env_get_cpu(env));
}
}
uint64_t get_psw_mask(CPUS390XState *env)
{
uint64_t r = env->psw.mask;
if (tcg_enabled()) {
env->cc_op = calc_cc(env, env->cc_op, env->cc_src, env->cc_dst,
env->cc_vr);
r &= ~PSW_MASK_CC;
assert(!(env->cc_op & ~3));
r |= (uint64_t)env->cc_op << 44;
}
return r;
}
LowCore *cpu_map_lowcore(CPUS390XState *env)
{
S390CPU *cpu = s390_env_get_cpu(env);
LowCore *lowcore;
hwaddr len = sizeof(LowCore);
lowcore = cpu_physical_memory_map(env->psa, &len, 1);
if (len < sizeof(LowCore)) {
cpu_abort(CPU(cpu), "Could not map lowcore\n");
}
return lowcore;
}
void cpu_unmap_lowcore(LowCore *lowcore)
{
cpu_physical_memory_unmap(lowcore, sizeof(LowCore), 1, sizeof(LowCore));
}
void do_restart_interrupt(CPUS390XState *env)
{
uint64_t mask, addr;
LowCore *lowcore;
lowcore = cpu_map_lowcore(env);
lowcore->restart_old_psw.mask = cpu_to_be64(get_psw_mask(env));
lowcore->restart_old_psw.addr = cpu_to_be64(env->psw.addr);
mask = be64_to_cpu(lowcore->restart_new_psw.mask);
addr = be64_to_cpu(lowcore->restart_new_psw.addr);
cpu_unmap_lowcore(lowcore);
env->pending_int &= ~INTERRUPT_RESTART;
load_psw(env, mask, addr);
}
void s390_cpu_recompute_watchpoints(CPUState *cs)
{
const int wp_flags = BP_CPU | BP_MEM_WRITE | BP_STOP_BEFORE_ACCESS;
S390CPU *cpu = S390_CPU(cs);
CPUS390XState *env = &cpu->env;
/* We are called when the watchpoints have changed. First
remove them all. */
cpu_watchpoint_remove_all(cs, BP_CPU);
/* Return if PER is not enabled */
if (!(env->psw.mask & PSW_MASK_PER)) {
return;
}
/* Return if storage-alteration event is not enabled. */
if (!(env->cregs[9] & PER_CR9_EVENT_STORE)) {
return;
}
if (env->cregs[10] == 0 && env->cregs[11] == -1LL) {
/* We can't create a watchoint spanning the whole memory range, so
split it in two parts. */
cpu_watchpoint_insert(cs, 0, 1ULL << 63, wp_flags, NULL);
cpu_watchpoint_insert(cs, 1ULL << 63, 1ULL << 63, wp_flags, NULL);
} else if (env->cregs[10] > env->cregs[11]) {
/* The address range loops, create two watchpoints. */
cpu_watchpoint_insert(cs, env->cregs[10], -env->cregs[10],
wp_flags, NULL);
cpu_watchpoint_insert(cs, 0, env->cregs[11] + 1, wp_flags, NULL);
} else {
/* Default case, create a single watchpoint. */
cpu_watchpoint_insert(cs, env->cregs[10],
env->cregs[11] - env->cregs[10] + 1,
wp_flags, NULL);
}
}
struct sigp_save_area {
uint64_t fprs[16]; /* 0x0000 */
uint64_t grs[16]; /* 0x0080 */
PSW psw; /* 0x0100 */
uint8_t pad_0x0110[0x0118 - 0x0110]; /* 0x0110 */
uint32_t prefix; /* 0x0118 */
uint32_t fpc; /* 0x011c */
uint8_t pad_0x0120[0x0124 - 0x0120]; /* 0x0120 */
uint32_t todpr; /* 0x0124 */
uint64_t cputm; /* 0x0128 */
uint64_t ckc; /* 0x0130 */
uint8_t pad_0x0138[0x0140 - 0x0138]; /* 0x0138 */
uint32_t ars[16]; /* 0x0140 */
uint64_t crs[16]; /* 0x0384 */
};
QEMU_BUILD_BUG_ON(sizeof(struct sigp_save_area) != 512);
int s390_store_status(S390CPU *cpu, hwaddr addr, bool store_arch)
{
static const uint8_t ar_id = 1;
struct sigp_save_area *sa;
hwaddr len = sizeof(*sa);
int i;
sa = cpu_physical_memory_map(addr, &len, 1);
if (!sa) {
return -EFAULT;
}
if (len != sizeof(*sa)) {
cpu_physical_memory_unmap(sa, len, 1, 0);
return -EFAULT;
}
if (store_arch) {
cpu_physical_memory_write(offsetof(LowCore, ar_access_id), &ar_id, 1);
}
for (i = 0; i < 16; ++i) {
sa->fprs[i] = cpu_to_be64(get_freg(&cpu->env, i)->ll);
}
for (i = 0; i < 16; ++i) {
sa->grs[i] = cpu_to_be64(cpu->env.regs[i]);
}
sa->psw.addr = cpu_to_be64(cpu->env.psw.addr);
sa->psw.mask = cpu_to_be64(get_psw_mask(&cpu->env));
sa->prefix = cpu_to_be32(cpu->env.psa);
sa->fpc = cpu_to_be32(cpu->env.fpc);
sa->todpr = cpu_to_be32(cpu->env.todpr);
sa->cputm = cpu_to_be64(cpu->env.cputm);
sa->ckc = cpu_to_be64(cpu->env.ckc >> 8);
for (i = 0; i < 16; ++i) {
sa->ars[i] = cpu_to_be32(cpu->env.aregs[i]);
}
for (i = 0; i < 16; ++i) {
sa->crs[i] = cpu_to_be64(cpu->env.cregs[i]);
}
cpu_physical_memory_unmap(sa, len, 1, len);
return 0;
}
#define ADTL_GS_OFFSET 1024 /* offset of GS data in adtl save area */
#define ADTL_GS_MIN_SIZE 2048 /* minimal size of adtl save area for GS */
int s390_store_adtl_status(S390CPU *cpu, hwaddr addr, hwaddr len)
{
hwaddr save = len;
void *mem;
mem = cpu_physical_memory_map(addr, &save, 1);
if (!mem) {
return -EFAULT;
}
if (save != len) {
cpu_physical_memory_unmap(mem, len, 1, 0);
return -EFAULT;
}
/* FIXME: as soon as TCG supports these features, convert cpu->be */
if (s390_has_feat(S390_FEAT_VECTOR)) {
memcpy(mem, &cpu->env.vregs, 512);
}
if (s390_has_feat(S390_FEAT_GUARDED_STORAGE) && len >= ADTL_GS_MIN_SIZE) {
memcpy(mem + ADTL_GS_OFFSET, &cpu->env.gscb, 32);
}
cpu_physical_memory_unmap(mem, len, 1, len);
return 0;
}
#endif /* CONFIG_USER_ONLY */
void s390_cpu_dump_state(CPUState *cs, FILE *f, fprintf_function cpu_fprintf,
int flags)
{
S390CPU *cpu = S390_CPU(cs);
CPUS390XState *env = &cpu->env;
int i;
if (env->cc_op > 3) {
cpu_fprintf(f, "PSW=mask %016" PRIx64 " addr %016" PRIx64 " cc %15s\n",
env->psw.mask, env->psw.addr, cc_name(env->cc_op));
} else {
cpu_fprintf(f, "PSW=mask %016" PRIx64 " addr %016" PRIx64 " cc %02x\n",
env->psw.mask, env->psw.addr, env->cc_op);
}
for (i = 0; i < 16; i++) {
cpu_fprintf(f, "R%02d=%016" PRIx64, i, env->regs[i]);
if ((i % 4) == 3) {
cpu_fprintf(f, "\n");
} else {
cpu_fprintf(f, " ");
}
}
for (i = 0; i < 16; i++) {
cpu_fprintf(f, "F%02d=%016" PRIx64, i, get_freg(env, i)->ll);
if ((i % 4) == 3) {
cpu_fprintf(f, "\n");
} else {
cpu_fprintf(f, " ");
}
}
for (i = 0; i < 32; i++) {
cpu_fprintf(f, "V%02d=%016" PRIx64 "%016" PRIx64, i,
env->vregs[i][0].ll, env->vregs[i][1].ll);
cpu_fprintf(f, (i % 2) ? "\n" : " ");
}
#ifndef CONFIG_USER_ONLY
for (i = 0; i < 16; i++) {
cpu_fprintf(f, "C%02d=%016" PRIx64, i, env->cregs[i]);
if ((i % 4) == 3) {
cpu_fprintf(f, "\n");
} else {
cpu_fprintf(f, " ");
}
}
#endif
#ifdef DEBUG_INLINE_BRANCHES
for (i = 0; i < CC_OP_MAX; i++) {
cpu_fprintf(f, " %15s = %10ld\t%10ld\n", cc_name(i),
inline_branch_miss[i], inline_branch_hit[i]);
}
#endif
cpu_fprintf(f, "\n");
}
const char *cc_name(enum cc_op cc_op)
{
static const char * const cc_names[] = {
[CC_OP_CONST0] = "CC_OP_CONST0",
[CC_OP_CONST1] = "CC_OP_CONST1",
[CC_OP_CONST2] = "CC_OP_CONST2",
[CC_OP_CONST3] = "CC_OP_CONST3",
[CC_OP_DYNAMIC] = "CC_OP_DYNAMIC",
[CC_OP_STATIC] = "CC_OP_STATIC",
[CC_OP_NZ] = "CC_OP_NZ",
[CC_OP_LTGT_32] = "CC_OP_LTGT_32",
[CC_OP_LTGT_64] = "CC_OP_LTGT_64",
[CC_OP_LTUGTU_32] = "CC_OP_LTUGTU_32",
[CC_OP_LTUGTU_64] = "CC_OP_LTUGTU_64",
[CC_OP_LTGT0_32] = "CC_OP_LTGT0_32",
[CC_OP_LTGT0_64] = "CC_OP_LTGT0_64",
[CC_OP_ADD_64] = "CC_OP_ADD_64",
[CC_OP_ADDU_64] = "CC_OP_ADDU_64",
[CC_OP_ADDC_64] = "CC_OP_ADDC_64",
[CC_OP_SUB_64] = "CC_OP_SUB_64",
[CC_OP_SUBU_64] = "CC_OP_SUBU_64",
[CC_OP_SUBB_64] = "CC_OP_SUBB_64",
[CC_OP_ABS_64] = "CC_OP_ABS_64",
[CC_OP_NABS_64] = "CC_OP_NABS_64",
[CC_OP_ADD_32] = "CC_OP_ADD_32",
[CC_OP_ADDU_32] = "CC_OP_ADDU_32",
[CC_OP_ADDC_32] = "CC_OP_ADDC_32",
[CC_OP_SUB_32] = "CC_OP_SUB_32",
[CC_OP_SUBU_32] = "CC_OP_SUBU_32",
[CC_OP_SUBB_32] = "CC_OP_SUBB_32",
[CC_OP_ABS_32] = "CC_OP_ABS_32",
[CC_OP_NABS_32] = "CC_OP_NABS_32",
[CC_OP_COMP_32] = "CC_OP_COMP_32",
[CC_OP_COMP_64] = "CC_OP_COMP_64",
[CC_OP_TM_32] = "CC_OP_TM_32",
[CC_OP_TM_64] = "CC_OP_TM_64",
[CC_OP_NZ_F32] = "CC_OP_NZ_F32",
[CC_OP_NZ_F64] = "CC_OP_NZ_F64",
[CC_OP_NZ_F128] = "CC_OP_NZ_F128",
[CC_OP_ICM] = "CC_OP_ICM",
[CC_OP_SLA_32] = "CC_OP_SLA_32",
[CC_OP_SLA_64] = "CC_OP_SLA_64",
[CC_OP_FLOGR] = "CC_OP_FLOGR",
};
return cc_names[cc_op];
}
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