target/sparc/int64_helper.c

   1 /*
   2  * Sparc64 interrupt helpers
   3  *
   4  *  Copyright (c) 2003-2005 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "qemu/main-loop.h"
  22 #include "cpu.h"
  23 #include "exec/helper-proto.h"
  24 #include "exec/log.h"
  25 #include "trace.h"
  26
  27 #define DEBUG_PCALL
  28
  29 #ifdef DEBUG_PCALL
  30 static const char * const excp_names[0x80] = {
  31     [TT_TFAULT] = "Instruction Access Fault",
  32     [TT_TMISS] = "Instruction Access MMU Miss",
  33     [TT_CODE_ACCESS] = "Instruction Access Error",
  34     [TT_ILL_INSN] = "Illegal Instruction",
  35     [TT_PRIV_INSN] = "Privileged Instruction",
  36     [TT_NFPU_INSN] = "FPU Disabled",
  37     [TT_FP_EXCP] = "FPU Exception",
  38     [TT_TOVF] = "Tag Overflow",
  39     [TT_CLRWIN] = "Clean Windows",
  40     [TT_DIV_ZERO] = "Division By Zero",
  41     [TT_DFAULT] = "Data Access Fault",
  42     [TT_DMISS] = "Data Access MMU Miss",
  43     [TT_DATA_ACCESS] = "Data Access Error",
  44     [TT_DPROT] = "Data Protection Error",
  45     [TT_UNALIGNED] = "Unaligned Memory Access",
  46     [TT_PRIV_ACT] = "Privileged Action",
  47     [TT_EXTINT | 0x1] = "External Interrupt 1",
  48     [TT_EXTINT | 0x2] = "External Interrupt 2",
  49     [TT_EXTINT | 0x3] = "External Interrupt 3",
  50     [TT_EXTINT | 0x4] = "External Interrupt 4",
  51     [TT_EXTINT | 0x5] = "External Interrupt 5",
  52     [TT_EXTINT | 0x6] = "External Interrupt 6",
  53     [TT_EXTINT | 0x7] = "External Interrupt 7",
  54     [TT_EXTINT | 0x8] = "External Interrupt 8",
  55     [TT_EXTINT | 0x9] = "External Interrupt 9",
  56     [TT_EXTINT | 0xa] = "External Interrupt 10",
  57     [TT_EXTINT | 0xb] = "External Interrupt 11",
  58     [TT_EXTINT | 0xc] = "External Interrupt 12",
  59     [TT_EXTINT | 0xd] = "External Interrupt 13",
  60     [TT_EXTINT | 0xe] = "External Interrupt 14",
  61     [TT_EXTINT | 0xf] = "External Interrupt 15",
  62 };
  63 #endif
  64
  65 void cpu_check_irqs(CPUSPARCState *env)
  66 {
  67     CPUState *cs;
  68     uint32_t pil = env->pil_in |
  69                   (env->softint & ~(SOFTINT_TIMER | SOFTINT_STIMER));
  70
  71     /* We should be holding the BQL before we mess with IRQs */
  72     g_assert(qemu_mutex_iothread_locked());
  73
  74     /* TT_IVEC has a higher priority (16) than TT_EXTINT (31..17) */
  75     if (env->ivec_status & 0x20) {
  76         return;
  77     }
  78     cs = env_cpu(env);
  79     /*
  80      * check if TM or SM in SOFTINT are set
  81      * setting these also causes interrupt 14
  82      */
  83     if (env->softint & (SOFTINT_TIMER | SOFTINT_STIMER)) {
  84         pil |= 1 << 14;
  85     }
  86
  87     /*
  88      * The bit corresponding to psrpil is (1<< psrpil),
  89      * the next bit is (2 << psrpil).
  90      */
  91     if (pil < (2 << env->psrpil)) {
  92         if (cs->interrupt_request & CPU_INTERRUPT_HARD) {
  93             trace_sparc64_cpu_check_irqs_reset_irq(env->interrupt_index);
  94             env->interrupt_index = 0;
  95             cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
  96         }
  97         return;
  98     }
  99
 100     if (cpu_interrupts_enabled(env)) {
 101
 102         unsigned int i;
 103
 104         for (i = 15; i > env->psrpil; i--) {
 105             if (pil & (1 << i)) {
 106                 int old_interrupt = env->interrupt_index;
 107                 int new_interrupt = TT_EXTINT | i;
 108
 109                 if (unlikely(env->tl > 0 && cpu_tsptr(env)->tt > new_interrupt
 110                   && ((cpu_tsptr(env)->tt & 0x1f0) == TT_EXTINT))) {
 111                     trace_sparc64_cpu_check_irqs_noset_irq(env->tl,
 112                                                       cpu_tsptr(env)->tt,
 113                                                       new_interrupt);
 114                 } else if (old_interrupt != new_interrupt) {
 115                     env->interrupt_index = new_interrupt;
 116                     trace_sparc64_cpu_check_irqs_set_irq(i, old_interrupt,
 117                                                          new_interrupt);
 118                     cpu_interrupt(cs, CPU_INTERRUPT_HARD);
 119                 }
 120                 break;
 121             }
 122         }
 123     } else if (cs->interrupt_request & CPU_INTERRUPT_HARD) {
 124         trace_sparc64_cpu_check_irqs_disabled(pil, env->pil_in, env->softint,
 125                                               env->interrupt_index);
 126         env->interrupt_index = 0;
 127         cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
 128     }
 129 }
 130
 131 void sparc_cpu_do_interrupt(CPUState *cs)
 132 {
 133     SPARCCPU *cpu = SPARC_CPU(cs);
 134     CPUSPARCState *env = &cpu->env;
 135     int intno = cs->exception_index;
 136     trap_state *tsptr;
 137
 138     /* Compute PSR before exposing state.  */
 139     if (env->cc_op != CC_OP_FLAGS) {
 140         cpu_get_psr(env);
 141     }
 142
 143 #ifdef DEBUG_PCALL
 144     if (qemu_loglevel_mask(CPU_LOG_INT)) {
 145         static int count;
 146         const char *name;
 147
 148         if (intno < 0 || intno >= 0x1ff) {
 149             name = "Unknown";
 150         } else if (intno >= 0x180) {
 151             name = "Hyperprivileged Trap Instruction";
 152         } else if (intno >= 0x100) {
 153             name = "Trap Instruction";
 154         } else if (intno >= 0xc0) {
 155             name = "Window Fill";
 156         } else if (intno >= 0x80) {
 157             name = "Window Spill";
 158         } else {
 159             name = excp_names[intno];
 160             if (!name) {
 161                 name = "Unknown";
 162             }
 163         }
 164
 165         qemu_log("%6d: %s (v=%04x)\n", count, name, intno);
 166         log_cpu_state(cs, 0);
 167 #if 0
 168         {
 169             int i;
 170             uint8_t *ptr;
 171
 172             qemu_log("       code=");
 173             ptr = (uint8_t *)env->pc;
 174             for (i = 0; i < 16; i++) {
 175                 qemu_log(" %02x", ldub(ptr + i));
 176             }
 177             qemu_log("\n");
 178         }
 179 #endif
 180         count++;
 181     }
 182 #endif
 183 #if !defined(CONFIG_USER_ONLY)
 184     if (env->tl >= env->maxtl) {
 185         cpu_abort(cs, "Trap 0x%04x while trap level (%d) >= MAXTL (%d),"
 186                   " Error state", cs->exception_index, env->tl, env->maxtl);
 187         return;
 188     }
 189 #endif
 190     if (env->tl < env->maxtl - 1) {
 191         env->tl++;
 192     } else {
 193         env->pstate |= PS_RED;
 194         if (env->tl < env->maxtl) {
 195             env->tl++;
 196         }
 197     }
 198     tsptr = cpu_tsptr(env);
 199
 200     tsptr->tstate = sparc64_tstate(env);
 201     tsptr->tpc = env->pc;
 202     tsptr->tnpc = env->npc;
 203     tsptr->tt = intno;
 204
 205     if (cpu_has_hypervisor(env)) {
 206         env->htstate[env->tl] = env->hpstate;
 207         /* XXX OpenSPARC T1 - UltraSPARC T3 have MAXPTL=2
 208            but this may change in the future */
 209         if (env->tl > 2) {
 210             env->hpstate |= HS_PRIV;
 211         }
 212     }
 213
 214     if (env->def.features & CPU_FEATURE_GL) {
 215         cpu_gl_switch_gregs(env, env->gl + 1);
 216         env->gl++;
 217     }
 218
 219     switch (intno) {
 220     case TT_IVEC:
 221         if (!cpu_has_hypervisor(env)) {
 222             cpu_change_pstate(env, PS_PEF | PS_PRIV | PS_IG);
 223         }
 224         break;
 225     case TT_TFAULT:
 226     case TT_DFAULT:
 227     case TT_TMISS ... TT_TMISS + 3:
 228     case TT_DMISS ... TT_DMISS + 3:
 229     case TT_DPROT ... TT_DPROT + 3:
 230         if (cpu_has_hypervisor(env)) {
 231             env->hpstate |= HS_PRIV;
 232             env->pstate = PS_PEF | PS_PRIV;
 233         } else {
 234             cpu_change_pstate(env, PS_PEF | PS_PRIV | PS_MG);
 235         }
 236         break;
 237     case TT_INSN_REAL_TRANSLATION_MISS ... TT_DATA_REAL_TRANSLATION_MISS:
 238     case TT_HTRAP ... TT_HTRAP + 127:
 239         env->hpstate |= HS_PRIV;
 240         break;
 241     default:
 242         cpu_change_pstate(env, PS_PEF | PS_PRIV | PS_AG);
 243         break;
 244     }
 245
 246     if (intno == TT_CLRWIN) {
 247         cpu_set_cwp(env, cpu_cwp_dec(env, env->cwp - 1));
 248     } else if ((intno & 0x1c0) == TT_SPILL) {
 249         cpu_set_cwp(env, cpu_cwp_dec(env, env->cwp - env->cansave - 2));
 250     } else if ((intno & 0x1c0) == TT_FILL) {
 251         cpu_set_cwp(env, cpu_cwp_inc(env, env->cwp + 1));
 252     }
 253
 254     if (cpu_hypervisor_mode(env)) {
 255         env->pc = (env->htba & ~0x3fffULL) | (intno << 5);
 256     } else {
 257         env->pc = env->tbr  & ~0x7fffULL;
 258         env->pc |= ((env->tl > 1) ? 1 << 14 : 0) | (intno << 5);
 259     }
 260     env->npc = env->pc + 4;
 261     cs->exception_index = -1;
 262 }
 263
 264 trap_state *cpu_tsptr(CPUSPARCState* env)
 265 {
 266     return &env->ts[env->tl & MAXTL_MASK];
 267 }
 268
 269 static bool do_modify_softint(CPUSPARCState *env, uint32_t value)
 270 {
 271     if (env->softint != value) {
 272         env->softint = value;
 273 #if !defined(CONFIG_USER_ONLY)
 274         if (cpu_interrupts_enabled(env)) {
 275             qemu_mutex_lock_iothread();
 276             cpu_check_irqs(env);
 277             qemu_mutex_unlock_iothread();
 278         }
 279 #endif
 280         return true;
 281     }
 282     return false;
 283 }
 284
 285 void helper_set_softint(CPUSPARCState *env, uint64_t value)
 286 {
 287     if (do_modify_softint(env, env->softint | (uint32_t)value)) {
 288         trace_int_helper_set_softint(env->softint);
 289     }
 290 }
 291
 292 void helper_clear_softint(CPUSPARCState *env, uint64_t value)
 293 {
 294     if (do_modify_softint(env, env->softint & (uint32_t)~value)) {
 295         trace_int_helper_clear_softint(env->softint);
 296     }
 297 }
 298
 299 void helper_write_softint(CPUSPARCState *env, uint64_t value)
 300 {
 301     if (do_modify_softint(env, (uint32_t)value)) {
 302         trace_int_helper_write_softint(env->softint);
 303     }
 304 }