1 /* 2 * RX emulation 3 * 4 * Copyright (c) 2019 Yoshinori Sato 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2 or later, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 * You should have received a copy of the GNU General Public License along with 16 * this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include "qemu/osdep.h" 20 #include "qemu/bitops.h" 21 #include "cpu.h" 22 #include "exec/log.h" 23 #include "exec/cpu_ldst.h" 24 #include "hw/irq.h" 25 26 void rx_cpu_unpack_psw(CPURXState *env, uint32_t psw, int rte) 27 { 28 if (env->psw_pm == 0) { 29 env->psw_ipl = FIELD_EX32(psw, PSW, IPL); 30 if (rte) { 31 /* PSW.PM can write RTE and RTFI */ 32 env->psw_pm = FIELD_EX32(psw, PSW, PM); 33 } 34 env->psw_u = FIELD_EX32(psw, PSW, U); 35 env->psw_i = FIELD_EX32(psw, PSW, I); 36 } 37 env->psw_o = FIELD_EX32(psw, PSW, O) << 31; 38 env->psw_s = FIELD_EX32(psw, PSW, S) << 31; 39 env->psw_z = 1 - FIELD_EX32(psw, PSW, Z); 40 env->psw_c = FIELD_EX32(psw, PSW, C); 41 } 42 43 #ifndef CONFIG_USER_ONLY 44 45 #define INT_FLAGS (CPU_INTERRUPT_HARD | CPU_INTERRUPT_FIR) 46 void rx_cpu_do_interrupt(CPUState *cs) 47 { 48 CPURXState *env = cpu_env(cs); 49 int do_irq = cs->interrupt_request & INT_FLAGS; 50 uint32_t save_psw; 51 52 env->in_sleep = 0; 53 54 if (env->psw_u) { 55 env->usp = env->regs[0]; 56 } else { 57 env->isp = env->regs[0]; 58 } 59 save_psw = rx_cpu_pack_psw(env); 60 env->psw_pm = env->psw_i = env->psw_u = 0; 61 62 if (do_irq) { 63 if (do_irq & CPU_INTERRUPT_FIR) { 64 env->bpc = env->pc; 65 env->bpsw = save_psw; 66 env->pc = env->fintv; 67 env->psw_ipl = 15; 68 cs->interrupt_request &= ~CPU_INTERRUPT_FIR; 69 qemu_set_irq(env->ack, env->ack_irq); 70 qemu_log_mask(CPU_LOG_INT, "fast interrupt raised\n"); 71 } else if (do_irq & CPU_INTERRUPT_HARD) { 72 env->isp -= 4; 73 cpu_stl_data(env, env->isp, save_psw); 74 env->isp -= 4; 75 cpu_stl_data(env, env->isp, env->pc); 76 env->pc = cpu_ldl_data(env, env->intb + env->ack_irq * 4); 77 env->psw_ipl = env->ack_ipl; 78 cs->interrupt_request &= ~CPU_INTERRUPT_HARD; 79 qemu_set_irq(env->ack, env->ack_irq); 80 qemu_log_mask(CPU_LOG_INT, 81 "interrupt 0x%02x raised\n", env->ack_irq); 82 } 83 } else { 84 uint32_t vec = cs->exception_index; 85 const char *expname = "unknown exception"; 86 87 env->isp -= 4; 88 cpu_stl_data(env, env->isp, save_psw); 89 env->isp -= 4; 90 cpu_stl_data(env, env->isp, env->pc); 91 92 if (vec < 0x100) { 93 env->pc = cpu_ldl_data(env, 0xffffffc0 + vec * 4); 94 } else { 95 env->pc = cpu_ldl_data(env, env->intb + (vec & 0xff) * 4); 96 } 97 switch (vec) { 98 case 20: 99 expname = "privilege violation"; 100 break; 101 case 21: 102 expname = "access exception"; 103 break; 104 case 23: 105 expname = "illegal instruction"; 106 break; 107 case 25: 108 expname = "fpu exception"; 109 break; 110 case 30: 111 expname = "non-maskable interrupt"; 112 break; 113 case 0x100 ... 0x1ff: 114 expname = "unconditional trap"; 115 } 116 qemu_log_mask(CPU_LOG_INT, "exception 0x%02x [%s] raised\n", 117 (vec & 0xff), expname); 118 } 119 env->regs[0] = env->isp; 120 } 121 122 bool rx_cpu_exec_interrupt(CPUState *cs, int interrupt_request) 123 { 124 CPURXState *env = cpu_env(cs); 125 int accept = 0; 126 /* hardware interrupt (Normal) */ 127 if ((interrupt_request & CPU_INTERRUPT_HARD) && 128 env->psw_i && (env->psw_ipl < env->req_ipl)) { 129 env->ack_irq = env->req_irq; 130 env->ack_ipl = env->req_ipl; 131 accept = 1; 132 } 133 /* hardware interrupt (FIR) */ 134 if ((interrupt_request & CPU_INTERRUPT_FIR) && 135 env->psw_i && (env->psw_ipl < 15)) { 136 accept = 1; 137 } 138 if (accept) { 139 rx_cpu_do_interrupt(cs); 140 return true; 141 } 142 return false; 143 } 144 145 hwaddr rx_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) 146 { 147 return addr; 148 } 149 150 #endif /* !CONFIG_USER_ONLY */ 151