target/rx/helper.c

   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     RXCPU *cpu = RX_CPU(cs);
  49     CPURXState *env = &cpu->env;
  50     int do_irq = cs->interrupt_request & INT_FLAGS;
  51     uint32_t save_psw;
  52
  53     env->in_sleep = 0;
  54
  55     if (env->psw_u) {
  56         env->usp = env->regs[0];
  57     } else {
  58         env->isp = env->regs[0];
  59     }
  60     save_psw = rx_cpu_pack_psw(env);
  61     env->psw_pm = env->psw_i = env->psw_u = 0;
  62
  63     if (do_irq) {
  64         if (do_irq & CPU_INTERRUPT_FIR) {
  65             env->bpc = env->pc;
  66             env->bpsw = save_psw;
  67             env->pc = env->fintv;
  68             env->psw_ipl = 15;
  69             cs->interrupt_request &= ~CPU_INTERRUPT_FIR;
  70             qemu_set_irq(env->ack, env->ack_irq);
  71             qemu_log_mask(CPU_LOG_INT, "fast interrupt raised\n");
  72         } else if (do_irq & CPU_INTERRUPT_HARD) {
  73             env->isp -= 4;
  74             cpu_stl_data(env, env->isp, save_psw);
  75             env->isp -= 4;
  76             cpu_stl_data(env, env->isp, env->pc);
  77             env->pc = cpu_ldl_data(env, env->intb + env->ack_irq * 4);
  78             env->psw_ipl = env->ack_ipl;
  79             cs->interrupt_request &= ~CPU_INTERRUPT_HARD;
  80             qemu_set_irq(env->ack, env->ack_irq);
  81             qemu_log_mask(CPU_LOG_INT,
  82                           "interrupt 0x%02x raised\n", env->ack_irq);
  83         }
  84     } else {
  85         uint32_t vec = cs->exception_index;
  86         const char *expname = "unknown exception";
  87
  88         env->isp -= 4;
  89         cpu_stl_data(env, env->isp, save_psw);
  90         env->isp -= 4;
  91         cpu_stl_data(env, env->isp, env->pc);
  92
  93         if (vec < 0x100) {
  94             env->pc = cpu_ldl_data(env, 0xffffffc0 + vec * 4);
  95         } else {
  96             env->pc = cpu_ldl_data(env, env->intb + (vec & 0xff) * 4);
  97         }
  98         switch (vec) {
  99         case 20:
 100             expname = "privilege violation";
 101             break;
 102         case 21:
 103             expname = "access exception";
 104             break;
 105         case 23:
 106             expname = "illegal instruction";
 107             break;
 108         case 25:
 109             expname = "fpu exception";
 110             break;
 111         case 30:
 112             expname = "non-maskable interrupt";
 113             break;
 114         case 0x100 ... 0x1ff:
 115             expname = "unconditional trap";
 116         }
 117         qemu_log_mask(CPU_LOG_INT, "exception 0x%02x [%s] raised\n",
 118                       (vec & 0xff), expname);
 119     }
 120     env->regs[0] = env->isp;
 121 }
 122
 123 bool rx_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 124 {
 125     RXCPU *cpu = RX_CPU(cs);
 126     CPURXState *env = &cpu->env;
 127     int accept = 0;
 128     /* hardware interrupt (Normal) */
 129     if ((interrupt_request & CPU_INTERRUPT_HARD) &&
 130         env->psw_i && (env->psw_ipl < env->req_ipl)) {
 131         env->ack_irq = env->req_irq;
 132         env->ack_ipl = env->req_ipl;
 133         accept = 1;
 134     }
 135     /* hardware interrupt (FIR) */
 136     if ((interrupt_request & CPU_INTERRUPT_FIR) &&
 137         env->psw_i && (env->psw_ipl < 15)) {
 138         accept = 1;
 139     }
 140     if (accept) {
 141         rx_cpu_do_interrupt(cs);
 142         return true;
 143     }
 144     return false;
 145 }
 146
 147 hwaddr rx_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
 148 {
 149     return addr;
 150 }
 151
 152 #endif /* !CONFIG_USER_ONLY */