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 */ 274