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qemu/target-s390x/misc_helper.c
Aurelien Jarno f0e0d817c2 target-s390x: PER instruction-fetch event support 
For the PER instruction-fetch, we can't use the QEMU breakpoint
infrastructure as it triggers for a single address and not a full
address range, and as it actually stop before the instruction and
not before.

We therefore call an helper with the just fetched instruction address,
which check if the address is within the PER address range. If it is
the case, an event is recorded and will be signaled through an
exception.

Note that we implement here the PER-3 behaviour, that is an invalid
opcode is not considered as an instruction fetch. Without PER-3 this
behavious is undefined.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
2015-06-17 12:40:52 +02:00

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/*
* S/390 misc helper routines
*
* Copyright (c) 2009 Ulrich Hecht
* Copyright (c) 2009 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 "cpu.h"
#include "exec/memory.h"
#include "qemu/host-utils.h"
#include "exec/helper-proto.h"
#include <string.h>
#include "sysemu/kvm.h"
#include "qemu/timer.h"
#include "exec/address-spaces.h"
#ifdef CONFIG_KVM
#include <linux/kvm.h>
#endif
#include "exec/cpu_ldst.h"
#include "hw/watchdog/wdt_diag288.h"
#if !defined(CONFIG_USER_ONLY)
#include "sysemu/cpus.h"
#include "sysemu/sysemu.h"
#include "hw/s390x/ebcdic.h"
#include "hw/s390x/ipl.h"
#endif
/* #define DEBUG_HELPER */
#ifdef DEBUG_HELPER
#define HELPER_LOG(x...) qemu_log(x)
#else
#define HELPER_LOG(x...)
#endif
/* Raise an exception dynamically from a helper function. */
void QEMU_NORETURN runtime_exception(CPUS390XState *env, int excp,
uintptr_t retaddr)
{
CPUState *cs = CPU(s390_env_get_cpu(env));
int t;
cs->exception_index = EXCP_PGM;
env->int_pgm_code = excp;
/* Use the (ultimate) callers address to find the insn that trapped. */
cpu_restore_state(cs, retaddr);
/* Advance past the insn. */
t = cpu_ldub_code(env, env->psw.addr);
env->int_pgm_ilen = t = get_ilen(t);
env->psw.addr += t;
cpu_loop_exit(cs);
}
/* Raise an exception statically from a TB. */
void HELPER(exception)(CPUS390XState *env, uint32_t excp)
{
CPUState *cs = CPU(s390_env_get_cpu(env));
HELPER_LOG("%s: exception %d\n", __func__, excp);
cs->exception_index = excp;
cpu_loop_exit(cs);
}
#ifndef CONFIG_USER_ONLY
void program_interrupt(CPUS390XState *env, uint32_t code, int ilen)
{
S390CPU *cpu = s390_env_get_cpu(env);
qemu_log_mask(CPU_LOG_INT, "program interrupt at %#" PRIx64 "\n",
env->psw.addr);
if (kvm_enabled()) {
#ifdef CONFIG_KVM
struct kvm_s390_irq irq = {
.type = KVM_S390_PROGRAM_INT,
.u.pgm.code = code,
};
kvm_s390_vcpu_interrupt(cpu, &irq);
#endif
} else {
CPUState *cs = CPU(cpu);
env->int_pgm_code = code;
env->int_pgm_ilen = ilen;
cs->exception_index = EXCP_PGM;
cpu_loop_exit(cs);
}
}
/* SCLP service call */
uint32_t HELPER(servc)(CPUS390XState *env, uint64_t r1, uint64_t r2)
{
int r = sclp_service_call(env, r1, r2);
if (r < 0) {
program_interrupt(env, -r, 4);
return 0;
}
return r;
}
#ifndef CONFIG_USER_ONLY
static int modified_clear_reset(S390CPU *cpu)
{
S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
CPUState *t;
pause_all_vcpus();
cpu_synchronize_all_states();
CPU_FOREACH(t) {
run_on_cpu(t, s390_do_cpu_full_reset, t);
}
cmma_reset(cpu);
io_subsystem_reset();
scc->load_normal(CPU(cpu));
cpu_synchronize_all_post_reset();
resume_all_vcpus();
return 0;
}
static int load_normal_reset(S390CPU *cpu)
{
S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
CPUState *t;
pause_all_vcpus();
cpu_synchronize_all_states();
CPU_FOREACH(t) {
run_on_cpu(t, s390_do_cpu_reset, t);
}
cmma_reset(cpu);
io_subsystem_reset();
scc->initial_cpu_reset(CPU(cpu));
scc->load_normal(CPU(cpu));
cpu_synchronize_all_post_reset();
resume_all_vcpus();
return 0;
}
int handle_diag_288(CPUS390XState *env, uint64_t r1, uint64_t r3)
{
uint64_t func = env->regs[r1];
uint64_t timeout = env->regs[r1 + 1];
uint64_t action = env->regs[r3];
Object *obj;
DIAG288State *diag288;
DIAG288Class *diag288_class;
if (r1 % 2 || action != 0) {
return -1;
}
/* Timeout must be more than 15 seconds except for timer deletion */
if (func != WDT_DIAG288_CANCEL && timeout < 15) {
return -1;
}
obj = object_resolve_path_type("", TYPE_WDT_DIAG288, NULL);
if (!obj) {
return -1;
}
diag288 = DIAG288(obj);
diag288_class = DIAG288_GET_CLASS(diag288);
return diag288_class->handle_timer(diag288, func, timeout);
}
#define DIAG_308_RC_OK 0x0001
#define DIAG_308_RC_NO_CONF 0x0102
#define DIAG_308_RC_INVALID 0x0402
void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3)
{
uint64_t addr = env->regs[r1];
uint64_t subcode = env->regs[r3];
IplParameterBlock *iplb;
if (env->psw.mask & PSW_MASK_PSTATE) {
program_interrupt(env, PGM_PRIVILEGED, ILEN_LATER_INC);
return;
}
if ((subcode & ~0x0ffffULL) || (subcode > 6)) {
program_interrupt(env, PGM_SPECIFICATION, ILEN_LATER_INC);
return;
}
switch (subcode) {
case 0:
modified_clear_reset(s390_env_get_cpu(env));
if (tcg_enabled()) {
cpu_loop_exit(CPU(s390_env_get_cpu(env)));
}
break;
case 1:
load_normal_reset(s390_env_get_cpu(env));
if (tcg_enabled()) {
cpu_loop_exit(CPU(s390_env_get_cpu(env)));
}
break;
case 3:
s390_reipl_request();
if (tcg_enabled()) {
cpu_loop_exit(CPU(s390_env_get_cpu(env)));
}
break;
case 5:
if ((r1 & 1) || (addr & 0x0fffULL)) {
program_interrupt(env, PGM_SPECIFICATION, ILEN_LATER_INC);
return;
}
if (!address_space_access_valid(&address_space_memory, addr,
sizeof(IplParameterBlock), false)) {
program_interrupt(env, PGM_ADDRESSING, ILEN_LATER_INC);
return;
}
iplb = g_malloc0(sizeof(struct IplParameterBlock));
cpu_physical_memory_read(addr, iplb, sizeof(struct IplParameterBlock));
if (!s390_ipl_update_diag308(iplb)) {
env->regs[r1 + 1] = DIAG_308_RC_OK;
} else {
env->regs[r1 + 1] = DIAG_308_RC_INVALID;
}
g_free(iplb);
return;
case 6:
if ((r1 & 1) || (addr & 0x0fffULL)) {
program_interrupt(env, PGM_SPECIFICATION, ILEN_LATER_INC);
return;
}
if (!address_space_access_valid(&address_space_memory, addr,
sizeof(IplParameterBlock), true)) {
program_interrupt(env, PGM_ADDRESSING, ILEN_LATER_INC);
return;
}
iplb = s390_ipl_get_iplb();
if (iplb) {
cpu_physical_memory_write(addr, iplb,
sizeof(struct IplParameterBlock));
env->regs[r1 + 1] = DIAG_308_RC_OK;
} else {
env->regs[r1 + 1] = DIAG_308_RC_NO_CONF;
}
return;
default:
hw_error("Unhandled diag308 subcode %" PRIx64, subcode);
break;
}
}
#endif
void HELPER(diag)(CPUS390XState *env, uint32_t r1, uint32_t r3, uint32_t num)
{
uint64_t r;
switch (num) {
case 0x500:
/* KVM hypercall */
r = s390_virtio_hypercall(env);
break;
case 0x44:
/* yield */
r = 0;
break;
case 0x308:
/* ipl */
handle_diag_308(env, r1, r3);
r = 0;
break;
default:
r = -1;
break;
}
if (r) {
program_interrupt(env, PGM_OPERATION, ILEN_LATER_INC);
}
}
/* Set Prefix */
void HELPER(spx)(CPUS390XState *env, uint64_t a1)
{
CPUState *cs = CPU(s390_env_get_cpu(env));
uint32_t prefix = a1 & 0x7fffe000;
env->psa = prefix;
qemu_log("prefix: %#x\n", prefix);
tlb_flush_page(cs, 0);
tlb_flush_page(cs, TARGET_PAGE_SIZE);
}
/* Store Clock */
uint64_t HELPER(stck)(CPUS390XState *env)
{
uint64_t time;
time = env->tod_offset +
time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - env->tod_basetime);
return time;
}
/* Set Clock Comparator */
void HELPER(sckc)(CPUS390XState *env, uint64_t time)
{
if (time == -1ULL) {
return;
}
env->ckc = time;
/* difference between origins */
time -= env->tod_offset;
/* nanoseconds */
time = tod2time(time);
timer_mod(env->tod_timer, env->tod_basetime + time);
}
/* Store Clock Comparator */
uint64_t HELPER(stckc)(CPUS390XState *env)
{
return env->ckc;
}
/* Set CPU Timer */
void HELPER(spt)(CPUS390XState *env, uint64_t time)
{
if (time == -1ULL) {
return;
}
/* nanoseconds */
time = tod2time(time);
env->cputm = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + time;
timer_mod(env->cpu_timer, env->cputm);
}
/* Store CPU Timer */
uint64_t HELPER(stpt)(CPUS390XState *env)
{
return time2tod(env->cputm - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
}
/* Store System Information */
uint32_t HELPER(stsi)(CPUS390XState *env, uint64_t a0,
uint64_t r0, uint64_t r1)
{
int cc = 0;
int sel1, sel2;
if ((r0 & STSI_LEVEL_MASK) <= STSI_LEVEL_3 &&
((r0 & STSI_R0_RESERVED_MASK) || (r1 & STSI_R1_RESERVED_MASK))) {
/* valid function code, invalid reserved bits */
program_interrupt(env, PGM_SPECIFICATION, 2);
}
sel1 = r0 & STSI_R0_SEL1_MASK;
sel2 = r1 & STSI_R1_SEL2_MASK;
/* XXX: spec exception if sysib is not 4k-aligned */
switch (r0 & STSI_LEVEL_MASK) {
case STSI_LEVEL_1:
if ((sel1 == 1) && (sel2 == 1)) {
/* Basic Machine Configuration */
struct sysib_111 sysib;
memset(&sysib, 0, sizeof(sysib));
ebcdic_put(sysib.manuf, "QEMU ", 16);
/* same as machine type number in STORE CPU ID */
ebcdic_put(sysib.type, "QEMU", 4);
/* same as model number in STORE CPU ID */
ebcdic_put(sysib.model, "QEMU ", 16);
ebcdic_put(sysib.sequence, "QEMU ", 16);
ebcdic_put(sysib.plant, "QEMU", 4);
cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
} else if ((sel1 == 2) && (sel2 == 1)) {
/* Basic Machine CPU */
struct sysib_121 sysib;
memset(&sysib, 0, sizeof(sysib));
/* XXX make different for different CPUs? */
ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
ebcdic_put(sysib.plant, "QEMU", 4);
stw_p(&sysib.cpu_addr, env->cpu_num);
cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
} else if ((sel1 == 2) && (sel2 == 2)) {
/* Basic Machine CPUs */
struct sysib_122 sysib;
memset(&sysib, 0, sizeof(sysib));
stl_p(&sysib.capability, 0x443afc29);
/* XXX change when SMP comes */
stw_p(&sysib.total_cpus, 1);
stw_p(&sysib.active_cpus, 1);
stw_p(&sysib.standby_cpus, 0);
stw_p(&sysib.reserved_cpus, 0);
cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
} else {
cc = 3;
}
break;
case STSI_LEVEL_2:
{
if ((sel1 == 2) && (sel2 == 1)) {
/* LPAR CPU */
struct sysib_221 sysib;
memset(&sysib, 0, sizeof(sysib));
/* XXX make different for different CPUs? */
ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
ebcdic_put(sysib.plant, "QEMU", 4);
stw_p(&sysib.cpu_addr, env->cpu_num);
stw_p(&sysib.cpu_id, 0);
cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
} else if ((sel1 == 2) && (sel2 == 2)) {
/* LPAR CPUs */
struct sysib_222 sysib;
memset(&sysib, 0, sizeof(sysib));
stw_p(&sysib.lpar_num, 0);
sysib.lcpuc = 0;
/* XXX change when SMP comes */
stw_p(&sysib.total_cpus, 1);
stw_p(&sysib.conf_cpus, 1);
stw_p(&sysib.standby_cpus, 0);
stw_p(&sysib.reserved_cpus, 0);
ebcdic_put(sysib.name, "QEMU ", 8);
stl_p(&sysib.caf, 1000);
stw_p(&sysib.dedicated_cpus, 0);
stw_p(&sysib.shared_cpus, 0);
cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
} else {
cc = 3;
}
break;
}
case STSI_LEVEL_3:
{
if ((sel1 == 2) && (sel2 == 2)) {
/* VM CPUs */
struct sysib_322 sysib;
memset(&sysib, 0, sizeof(sysib));
sysib.count = 1;
/* XXX change when SMP comes */
stw_p(&sysib.vm[0].total_cpus, 1);
stw_p(&sysib.vm[0].conf_cpus, 1);
stw_p(&sysib.vm[0].standby_cpus, 0);
stw_p(&sysib.vm[0].reserved_cpus, 0);
ebcdic_put(sysib.vm[0].name, "KVMguest", 8);
stl_p(&sysib.vm[0].caf, 1000);
ebcdic_put(sysib.vm[0].cpi, "KVM/Linux ", 16);
cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
} else {
cc = 3;
}
break;
}
case STSI_LEVEL_CURRENT:
env->regs[0] = STSI_LEVEL_3;
break;
default:
cc = 3;
break;
}
return cc;
}
uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1,
uint64_t cpu_addr)
{
int cc = SIGP_CC_ORDER_CODE_ACCEPTED;
HELPER_LOG("%s: %016" PRIx64 " %08x %016" PRIx64 "\n",
__func__, order_code, r1, cpu_addr);
/* Remember: Use "R1 or R1 + 1, whichever is the odd-numbered register"
as parameter (input). Status (output) is always R1. */
switch (order_code) {
case SIGP_SET_ARCH:
/* switch arch */
break;
case SIGP_SENSE:
/* enumerate CPU status */
if (cpu_addr) {
/* XXX implement when SMP comes */
return 3;
}
env->regs[r1] &= 0xffffffff00000000ULL;
cc = 1;
break;
#if !defined(CONFIG_USER_ONLY)
case SIGP_RESTART:
qemu_system_reset_request();
cpu_loop_exit(CPU(s390_env_get_cpu(env)));
break;
case SIGP_STOP:
qemu_system_shutdown_request();
cpu_loop_exit(CPU(s390_env_get_cpu(env)));
break;
#endif
default:
/* unknown sigp */
fprintf(stderr, "XXX unknown sigp: 0x%" PRIx64 "\n", order_code);
cc = SIGP_CC_NOT_OPERATIONAL;
}
return cc;
}
#endif
#ifndef CONFIG_USER_ONLY
void HELPER(xsch)(CPUS390XState *env, uint64_t r1)
{
S390CPU *cpu = s390_env_get_cpu(env);
ioinst_handle_xsch(cpu, r1);
}
void HELPER(csch)(CPUS390XState *env, uint64_t r1)
{
S390CPU *cpu = s390_env_get_cpu(env);
ioinst_handle_csch(cpu, r1);
}
void HELPER(hsch)(CPUS390XState *env, uint64_t r1)
{
S390CPU *cpu = s390_env_get_cpu(env);
ioinst_handle_hsch(cpu, r1);
}
void HELPER(msch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
{
S390CPU *cpu = s390_env_get_cpu(env);
ioinst_handle_msch(cpu, r1, inst >> 16);
}
void HELPER(rchp)(CPUS390XState *env, uint64_t r1)
{
S390CPU *cpu = s390_env_get_cpu(env);
ioinst_handle_rchp(cpu, r1);
}
void HELPER(rsch)(CPUS390XState *env, uint64_t r1)
{
S390CPU *cpu = s390_env_get_cpu(env);
ioinst_handle_rsch(cpu, r1);
}
void HELPER(ssch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
{
S390CPU *cpu = s390_env_get_cpu(env);
ioinst_handle_ssch(cpu, r1, inst >> 16);
}
void HELPER(stsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
{
S390CPU *cpu = s390_env_get_cpu(env);
ioinst_handle_stsch(cpu, r1, inst >> 16);
}
void HELPER(tsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
{
S390CPU *cpu = s390_env_get_cpu(env);
ioinst_handle_tsch(cpu, r1, inst >> 16);
}
void HELPER(chsc)(CPUS390XState *env, uint64_t inst)
{
S390CPU *cpu = s390_env_get_cpu(env);
ioinst_handle_chsc(cpu, inst >> 16);
}
#endif
#ifndef CONFIG_USER_ONLY
void HELPER(per_check_exception)(CPUS390XState *env)
{
CPUState *cs = CPU(s390_env_get_cpu(env));
if (env->per_perc_atmid) {
env->int_pgm_code = PGM_PER;
env->int_pgm_ilen = get_ilen(cpu_ldub_code(env, env->per_address));
cs->exception_index = EXCP_PGM;
cpu_loop_exit(cs);
}
}
void HELPER(per_branch)(CPUS390XState *env, uint64_t from, uint64_t to)
{
if ((env->cregs[9] & PER_CR9_EVENT_BRANCH)) {
if (!(env->cregs[9] & PER_CR9_CONTROL_BRANCH_ADDRESS)
|| get_per_in_range(env, to)) {
env->per_address = from;
env->per_perc_atmid = PER_CODE_EVENT_BRANCH | get_per_atmid(env);
}
}
}
void HELPER(per_ifetch)(CPUS390XState *env, uint64_t addr)
{
if ((env->cregs[9] & PER_CR9_EVENT_IFETCH) && get_per_in_range(env, addr)) {
env->per_address = addr;
env->per_perc_atmid = PER_CODE_EVENT_IFETCH | get_per_atmid(env);
}
}
#endif
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