target/s390x/helper.c

   1 /*
   2  *  S/390 helpers - sysemu only
   3  *
   4  *  Copyright (c) 2009 Ulrich Hecht
   5  *  Copyright (c) 2011 Alexander Graf
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "cpu.h"
  23 #include "s390x-internal.h"
  24 #include "gdbstub/helpers.h"
  25 #include "qemu/timer.h"
  26 #include "hw/s390x/ioinst.h"
  27 #include "target/s390x/kvm/pv.h"
  28 #include "sysemu/hw_accel.h"
  29 #include "sysemu/runstate.h"
  30
  31 void s390x_tod_timer(void *opaque)
  32 {
  33     cpu_inject_clock_comparator((S390CPU *) opaque);
  34 }
  35
  36 void s390x_cpu_timer(void *opaque)
  37 {
  38     cpu_inject_cpu_timer((S390CPU *) opaque);
  39 }
  40
  41 hwaddr s390_cpu_get_phys_page_debug(CPUState *cs, vaddr vaddr)
  42 {
  43     S390CPU *cpu = S390_CPU(cs);
  44     CPUS390XState *env = &cpu->env;
  45     target_ulong raddr;
  46     int prot;
  47     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
  48     uint64_t tec;
  49
  50     /* 31-Bit mode */
  51     if (!(env->psw.mask & PSW_MASK_64)) {
  52         vaddr &= 0x7fffffff;
  53     }
  54
  55     /* We want to read the code (e.g., see what we are single-stepping).*/
  56     if (asc != PSW_ASC_HOME) {
  57         asc = PSW_ASC_PRIMARY;
  58     }
  59
  60     /*
  61      * We want to read code even if IEP is active. Use MMU_DATA_LOAD instead
  62      * of MMU_INST_FETCH.
  63      */
  64     if (mmu_translate(env, vaddr, MMU_DATA_LOAD, asc, &raddr, &prot, &tec)) {
  65         return -1;
  66     }
  67     return raddr;
  68 }
  69
  70 hwaddr s390_cpu_get_phys_addr_debug(CPUState *cs, vaddr vaddr)
  71 {
  72     hwaddr phys_addr;
  73     target_ulong page;
  74
  75     page = vaddr & TARGET_PAGE_MASK;
  76     phys_addr = cpu_get_phys_page_debug(cs, page);
  77     phys_addr += (vaddr & ~TARGET_PAGE_MASK);
  78
  79     return phys_addr;
  80 }
  81
  82 static inline bool is_special_wait_psw(uint64_t psw_addr)
  83 {
  84     /* signal quiesce */
  85     return (psw_addr & 0xfffUL) == 0xfffUL;
  86 }
  87
  88 void s390_handle_wait(S390CPU *cpu)
  89 {
  90     CPUState *cs = CPU(cpu);
  91
  92     if (s390_cpu_halt(cpu) == 0) {
  93         if (is_special_wait_psw(cpu->env.psw.addr)) {
  94             qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
  95         } else {
  96             cpu->env.crash_reason = S390_CRASH_REASON_DISABLED_WAIT;
  97             qemu_system_guest_panicked(cpu_get_crash_info(cs));
  98         }
  99     }
 100 }
 101
 102 LowCore *cpu_map_lowcore(CPUS390XState *env)
 103 {
 104     LowCore *lowcore;
 105     hwaddr len = sizeof(LowCore);
 106
 107     lowcore = cpu_physical_memory_map(env->psa, &len, true);
 108
 109     if (len < sizeof(LowCore)) {
 110         cpu_abort(env_cpu(env), "Could not map lowcore\n");
 111     }
 112
 113     return lowcore;
 114 }
 115
 116 void cpu_unmap_lowcore(LowCore *lowcore)
 117 {
 118     cpu_physical_memory_unmap(lowcore, sizeof(LowCore), 1, sizeof(LowCore));
 119 }
 120
 121 void do_restart_interrupt(CPUS390XState *env)
 122 {
 123     uint64_t mask, addr;
 124     LowCore *lowcore;
 125
 126     lowcore = cpu_map_lowcore(env);
 127
 128     lowcore->restart_old_psw.mask = cpu_to_be64(s390_cpu_get_psw_mask(env));
 129     lowcore->restart_old_psw.addr = cpu_to_be64(env->psw.addr);
 130     mask = be64_to_cpu(lowcore->restart_new_psw.mask);
 131     addr = be64_to_cpu(lowcore->restart_new_psw.addr);
 132
 133     cpu_unmap_lowcore(lowcore);
 134     env->pending_int &= ~INTERRUPT_RESTART;
 135
 136     s390_cpu_set_psw(env, mask, addr);
 137 }
 138
 139 void s390_cpu_recompute_watchpoints(CPUState *cs)
 140 {
 141     const int wp_flags = BP_CPU | BP_MEM_WRITE | BP_STOP_BEFORE_ACCESS;
 142     S390CPU *cpu = S390_CPU(cs);
 143     CPUS390XState *env = &cpu->env;
 144
 145     /* We are called when the watchpoints have changed. First
 146        remove them all.  */
 147     cpu_watchpoint_remove_all(cs, BP_CPU);
 148
 149     /* Return if PER is not enabled */
 150     if (!(env->psw.mask & PSW_MASK_PER)) {
 151         return;
 152     }
 153
 154     /* Return if storage-alteration event is not enabled.  */
 155     if (!(env->cregs[9] & PER_CR9_EVENT_STORE)) {
 156         return;
 157     }
 158
 159     if (env->cregs[10] == 0 && env->cregs[11] == -1LL) {
 160         /* We can't create a watchoint spanning the whole memory range, so
 161            split it in two parts.   */
 162         cpu_watchpoint_insert(cs, 0, 1ULL << 63, wp_flags, NULL);
 163         cpu_watchpoint_insert(cs, 1ULL << 63, 1ULL << 63, wp_flags, NULL);
 164     } else if (env->cregs[10] > env->cregs[11]) {
 165         /* The address range loops, create two watchpoints.  */
 166         cpu_watchpoint_insert(cs, env->cregs[10], -env->cregs[10],
 167                               wp_flags, NULL);
 168         cpu_watchpoint_insert(cs, 0, env->cregs[11] + 1, wp_flags, NULL);
 169
 170     } else {
 171         /* Default case, create a single watchpoint.  */
 172         cpu_watchpoint_insert(cs, env->cregs[10],
 173                               env->cregs[11] - env->cregs[10] + 1,
 174                               wp_flags, NULL);
 175     }
 176 }
 177
 178 typedef struct SigpSaveArea {
 179     uint64_t    fprs[16];                       /* 0x0000 */
 180     uint64_t    grs[16];                        /* 0x0080 */
 181     PSW         psw;                            /* 0x0100 */
 182     uint8_t     pad_0x0110[0x0118 - 0x0110];    /* 0x0110 */
 183     uint32_t    prefix;                         /* 0x0118 */
 184     uint32_t    fpc;                            /* 0x011c */
 185     uint8_t     pad_0x0120[0x0124 - 0x0120];    /* 0x0120 */
 186     uint32_t    todpr;                          /* 0x0124 */
 187     uint64_t    cputm;                          /* 0x0128 */
 188     uint64_t    ckc;                            /* 0x0130 */
 189     uint8_t     pad_0x0138[0x0140 - 0x0138];    /* 0x0138 */
 190     uint32_t    ars[16];                        /* 0x0140 */
 191     uint64_t    crs[16];                        /* 0x0384 */
 192 } SigpSaveArea;
 193 QEMU_BUILD_BUG_ON(sizeof(SigpSaveArea) != 512);
 194
 195 int s390_store_status(S390CPU *cpu, hwaddr addr, bool store_arch)
 196 {
 197     static const uint8_t ar_id = 1;
 198     SigpSaveArea *sa;
 199     hwaddr len = sizeof(*sa);
 200     int i;
 201
 202     /* For PVMs storing will occur when this cpu enters SIE again */
 203     if (s390_is_pv()) {
 204         return 0;
 205     }
 206
 207     sa = cpu_physical_memory_map(addr, &len, true);
 208     if (!sa) {
 209         return -EFAULT;
 210     }
 211     if (len != sizeof(*sa)) {
 212         cpu_physical_memory_unmap(sa, len, 1, 0);
 213         return -EFAULT;
 214     }
 215
 216     if (store_arch) {
 217         cpu_physical_memory_write(offsetof(LowCore, ar_access_id), &ar_id, 1);
 218     }
 219     for (i = 0; i < 16; ++i) {
 220         sa->fprs[i] = cpu_to_be64(*get_freg(&cpu->env, i));
 221     }
 222     for (i = 0; i < 16; ++i) {
 223         sa->grs[i] = cpu_to_be64(cpu->env.regs[i]);
 224     }
 225     sa->psw.addr = cpu_to_be64(cpu->env.psw.addr);
 226     sa->psw.mask = cpu_to_be64(s390_cpu_get_psw_mask(&cpu->env));
 227     sa->prefix = cpu_to_be32(cpu->env.psa);
 228     sa->fpc = cpu_to_be32(cpu->env.fpc);
 229     sa->todpr = cpu_to_be32(cpu->env.todpr);
 230     sa->cputm = cpu_to_be64(cpu->env.cputm);
 231     sa->ckc = cpu_to_be64(cpu->env.ckc >> 8);
 232     for (i = 0; i < 16; ++i) {
 233         sa->ars[i] = cpu_to_be32(cpu->env.aregs[i]);
 234     }
 235     for (i = 0; i < 16; ++i) {
 236         sa->crs[i] = cpu_to_be64(cpu->env.cregs[i]);
 237     }
 238
 239     cpu_physical_memory_unmap(sa, len, 1, len);
 240
 241     return 0;
 242 }
 243
 244 typedef struct SigpAdtlSaveArea {
 245     uint64_t    vregs[32][2];                     /* 0x0000 */
 246     uint8_t     pad_0x0200[0x0400 - 0x0200];      /* 0x0200 */
 247     uint64_t    gscb[4];                          /* 0x0400 */
 248     uint8_t     pad_0x0420[0x1000 - 0x0420];      /* 0x0420 */
 249 } SigpAdtlSaveArea;
 250 QEMU_BUILD_BUG_ON(sizeof(SigpAdtlSaveArea) != 4096);
 251
 252 #define ADTL_GS_MIN_SIZE 2048 /* minimal size of adtl save area for GS */
 253 int s390_store_adtl_status(S390CPU *cpu, hwaddr addr, hwaddr len)
 254 {
 255     SigpAdtlSaveArea *sa;
 256     hwaddr save = len;
 257     int i;
 258
 259     sa = cpu_physical_memory_map(addr, &save, true);
 260     if (!sa) {
 261         return -EFAULT;
 262     }
 263     if (save != len) {
 264         cpu_physical_memory_unmap(sa, len, 1, 0);
 265         return -EFAULT;
 266     }
 267
 268     if (s390_has_feat(S390_FEAT_VECTOR)) {
 269         for (i = 0; i < 32; i++) {
 270             sa->vregs[i][0] = cpu_to_be64(cpu->env.vregs[i][0]);
 271             sa->vregs[i][1] = cpu_to_be64(cpu->env.vregs[i][1]);
 272         }
 273     }
 274     if (s390_has_feat(S390_FEAT_GUARDED_STORAGE) && len >= ADTL_GS_MIN_SIZE) {
 275         for (i = 0; i < 4; i++) {
 276             sa->gscb[i] = cpu_to_be64(cpu->env.gscb[i]);
 277         }
 278     }
 279
 280     cpu_physical_memory_unmap(sa, len, 1, len);
 281     return 0;
 282 }