target/xtensa/exc_helper.c

   1 /*
   2  * Copyright (c) 2011 - 2019, Max Filippov, Open Source and Linux Lab.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *     * Redistributions of source code must retain the above copyright
   8  *       notice, this list of conditions and the following disclaimer.
   9  *     * Redistributions in binary form must reproduce the above copyright
  10  *       notice, this list of conditions and the following disclaimer in the
  11  *       documentation and/or other materials provided with the distribution.
  12  *     * Neither the name of the Open Source and Linux Lab nor the
  13  *       names of its contributors may be used to endorse or promote products
  14  *       derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  25  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "qemu/log.h"
  30 #include "qemu/main-loop.h"
  31 #include "cpu.h"
  32 #include "exec/helper-proto.h"
  33 #include "qemu/host-utils.h"
  34 #include "exec/exec-all.h"
  35
  36 void HELPER(exception)(CPUXtensaState *env, uint32_t excp)
  37 {
  38     CPUState *cs = env_cpu(env);
  39
  40     cs->exception_index = excp;
  41     if (excp == EXCP_YIELD) {
  42         env->yield_needed = 0;
  43     }
  44     cpu_loop_exit(cs);
  45 }
  46
  47 void HELPER(exception_cause)(CPUXtensaState *env, uint32_t pc, uint32_t cause)
  48 {
  49     uint32_t vector;
  50
  51     env->pc = pc;
  52     if (env->sregs[PS] & PS_EXCM) {
  53         if (env->config->ndepc) {
  54             env->sregs[DEPC] = pc;
  55         } else {
  56             env->sregs[EPC1] = pc;
  57         }
  58         vector = EXC_DOUBLE;
  59     } else {
  60         env->sregs[EPC1] = pc;
  61         vector = (env->sregs[PS] & PS_UM) ? EXC_USER : EXC_KERNEL;
  62     }
  63
  64     env->sregs[EXCCAUSE] = cause;
  65     env->sregs[PS] |= PS_EXCM;
  66
  67     HELPER(exception)(env, vector);
  68 }
  69
  70 void HELPER(exception_cause_vaddr)(CPUXtensaState *env,
  71                                    uint32_t pc, uint32_t cause, uint32_t vaddr)
  72 {
  73     env->sregs[EXCVADDR] = vaddr;
  74     HELPER(exception_cause)(env, pc, cause);
  75 }
  76
  77 void debug_exception_env(CPUXtensaState *env, uint32_t cause)
  78 {
  79     if (xtensa_get_cintlevel(env) < env->config->debug_level) {
  80         HELPER(debug_exception)(env, env->pc, cause);
  81     }
  82 }
  83
  84 void HELPER(debug_exception)(CPUXtensaState *env, uint32_t pc, uint32_t cause)
  85 {
  86     unsigned level = env->config->debug_level;
  87
  88     env->pc = pc;
  89     env->sregs[DEBUGCAUSE] = cause;
  90     env->sregs[EPC1 + level - 1] = pc;
  91     env->sregs[EPS2 + level - 2] = env->sregs[PS];
  92     env->sregs[PS] = (env->sregs[PS] & ~PS_INTLEVEL) | PS_EXCM |
  93         (level << PS_INTLEVEL_SHIFT);
  94     HELPER(exception)(env, EXC_DEBUG);
  95 }
  96
  97 #ifndef CONFIG_USER_ONLY
  98
  99 void HELPER(waiti)(CPUXtensaState *env, uint32_t pc, uint32_t intlevel)
 100 {
 101     CPUState *cpu = env_cpu(env);
 102
 103     env->pc = pc;
 104     env->sregs[PS] = (env->sregs[PS] & ~PS_INTLEVEL) |
 105         (intlevel << PS_INTLEVEL_SHIFT);
 106
 107     qemu_mutex_lock_iothread();
 108     check_interrupts(env);
 109     qemu_mutex_unlock_iothread();
 110
 111     if (env->pending_irq_level) {
 112         cpu_loop_exit(cpu);
 113         return;
 114     }
 115
 116     cpu->halted = 1;
 117     HELPER(exception)(env, EXCP_HLT);
 118 }
 119
 120 void HELPER(check_interrupts)(CPUXtensaState *env)
 121 {
 122     qemu_mutex_lock_iothread();
 123     check_interrupts(env);
 124     qemu_mutex_unlock_iothread();
 125 }
 126
 127 void HELPER(intset)(CPUXtensaState *env, uint32_t v)
 128 {
 129     qatomic_or(&env->sregs[INTSET],
 130               v & env->config->inttype_mask[INTTYPE_SOFTWARE]);
 131 }
 132
 133 static void intclear(CPUXtensaState *env, uint32_t v)
 134 {
 135     qatomic_and(&env->sregs[INTSET], ~v);
 136 }
 137
 138 void HELPER(intclear)(CPUXtensaState *env, uint32_t v)
 139 {
 140     intclear(env, v & (env->config->inttype_mask[INTTYPE_SOFTWARE] |
 141                        env->config->inttype_mask[INTTYPE_EDGE]));
 142 }
 143
 144 static uint32_t relocated_vector(CPUXtensaState *env, uint32_t vector)
 145 {
 146     if (xtensa_option_enabled(env->config,
 147                               XTENSA_OPTION_RELOCATABLE_VECTOR)) {
 148         return vector - env->config->vecbase + env->sregs[VECBASE];
 149     } else {
 150         return vector;
 151     }
 152 }
 153
 154 /*!
 155  * Handle penging IRQ.
 156  * For the high priority interrupt jump to the corresponding interrupt vector.
 157  * For the level-1 interrupt convert it to either user, kernel or double
 158  * exception with the 'level-1 interrupt' exception cause.
 159  */
 160 static void handle_interrupt(CPUXtensaState *env)
 161 {
 162     int level = env->pending_irq_level;
 163
 164     if ((level > xtensa_get_cintlevel(env) &&
 165          level <= env->config->nlevel &&
 166          (env->config->level_mask[level] &
 167           env->sregs[INTSET] & env->sregs[INTENABLE])) ||
 168         level == env->config->nmi_level) {
 169         CPUState *cs = env_cpu(env);
 170
 171         if (level > 1) {
 172             /* env->config->nlevel check should have ensured this */
 173             assert(level < sizeof(env->config->interrupt_vector));
 174
 175             env->sregs[EPC1 + level - 1] = env->pc;
 176             env->sregs[EPS2 + level - 2] = env->sregs[PS];
 177             env->sregs[PS] =
 178                 (env->sregs[PS] & ~PS_INTLEVEL) | level | PS_EXCM;
 179             env->pc = relocated_vector(env,
 180                                        env->config->interrupt_vector[level]);
 181             if (level == env->config->nmi_level) {
 182                 intclear(env, env->config->inttype_mask[INTTYPE_NMI]);
 183             }
 184         } else {
 185             env->sregs[EXCCAUSE] = LEVEL1_INTERRUPT_CAUSE;
 186
 187             if (env->sregs[PS] & PS_EXCM) {
 188                 if (env->config->ndepc) {
 189                     env->sregs[DEPC] = env->pc;
 190                 } else {
 191                     env->sregs[EPC1] = env->pc;
 192                 }
 193                 cs->exception_index = EXC_DOUBLE;
 194             } else {
 195                 env->sregs[EPC1] = env->pc;
 196                 cs->exception_index =
 197                     (env->sregs[PS] & PS_UM) ? EXC_USER : EXC_KERNEL;
 198             }
 199             env->sregs[PS] |= PS_EXCM;
 200         }
 201     }
 202 }
 203
 204 /* Called from cpu_handle_interrupt with BQL held */
 205 void xtensa_cpu_do_interrupt(CPUState *cs)
 206 {
 207     XtensaCPU *cpu = XTENSA_CPU(cs);
 208     CPUXtensaState *env = &cpu->env;
 209
 210     if (cs->exception_index == EXC_IRQ) {
 211         qemu_log_mask(CPU_LOG_INT,
 212                       "%s(EXC_IRQ) level = %d, cintlevel = %d, "
 213                       "pc = %08x, a0 = %08x, ps = %08x, "
 214                       "intset = %08x, intenable = %08x, "
 215                       "ccount = %08x\n",
 216                       __func__, env->pending_irq_level,
 217                       xtensa_get_cintlevel(env),
 218                       env->pc, env->regs[0], env->sregs[PS],
 219                       env->sregs[INTSET], env->sregs[INTENABLE],
 220                       env->sregs[CCOUNT]);
 221         handle_interrupt(env);
 222     }
 223
 224     switch (cs->exception_index) {
 225     case EXC_WINDOW_OVERFLOW4:
 226     case EXC_WINDOW_UNDERFLOW4:
 227     case EXC_WINDOW_OVERFLOW8:
 228     case EXC_WINDOW_UNDERFLOW8:
 229     case EXC_WINDOW_OVERFLOW12:
 230     case EXC_WINDOW_UNDERFLOW12:
 231     case EXC_KERNEL:
 232     case EXC_USER:
 233     case EXC_DOUBLE:
 234     case EXC_DEBUG:
 235         qemu_log_mask(CPU_LOG_INT, "%s(%d) "
 236                       "pc = %08x, a0 = %08x, ps = %08x, ccount = %08x\n",
 237                       __func__, cs->exception_index,
 238                       env->pc, env->regs[0], env->sregs[PS],
 239                       env->sregs[CCOUNT]);
 240         if (env->config->exception_vector[cs->exception_index]) {
 241             uint32_t vector;
 242
 243             vector = env->config->exception_vector[cs->exception_index];
 244             env->pc = relocated_vector(env, vector);
 245         } else {
 246             qemu_log_mask(CPU_LOG_INT,
 247                           "%s(pc = %08x) bad exception_index: %d\n",
 248                           __func__, env->pc, cs->exception_index);
 249         }
 250         break;
 251
 252     case EXC_IRQ:
 253         break;
 254
 255     default:
 256         qemu_log("%s(pc = %08x) unknown exception_index: %d\n",
 257                  __func__, env->pc, cs->exception_index);
 258         break;
 259     }
 260     check_interrupts(env);
 261 }
 262
 263 bool xtensa_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 264 {
 265     if (interrupt_request & CPU_INTERRUPT_HARD) {
 266         cs->exception_index = EXC_IRQ;
 267         xtensa_cpu_do_interrupt(cs);
 268         return true;
 269     }
 270     return false;
 271 }
 272
 273 #endif /* !CONFIG_USER_ONLY */