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/*
* RX emulation
*
* Copyright (c) 2019 Yoshinori Sato
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/bitops.h"
#include "cpu.h"
#include "exec/log.h"
#include "exec/cpu_ldst.h"
#include "sysemu/sysemu.h"
#include "hw/irq.h"
void rx_cpu_unpack_psw(CPURXState *env, uint32_t psw, int rte)
{
if (env->psw_pm == 0) {
env->psw_ipl = FIELD_EX32(psw, PSW, IPL);
if (rte) {
/* PSW.PM can write RTE and RTFI */
env->psw_pm = FIELD_EX32(psw, PSW, PM);
}
env->psw_u = FIELD_EX32(psw, PSW, U);
env->psw_i = FIELD_EX32(psw, PSW, I);
}
env->psw_o = FIELD_EX32(psw, PSW, O) << 31;
env->psw_s = FIELD_EX32(psw, PSW, S) << 31;
env->psw_z = 1 - FIELD_EX32(psw, PSW, Z);
env->psw_c = FIELD_EX32(psw, PSW, C);
}
#define INT_FLAGS (CPU_INTERRUPT_HARD | CPU_INTERRUPT_FIR)
void rx_cpu_do_interrupt(CPUState *cs)
{
RXCPU *cpu = RX_CPU(cs);
CPURXState *env = &cpu->env;
int do_irq = cs->interrupt_request & INT_FLAGS;
uint32_t save_psw;
env->in_sleep = 0;
if (env->psw_u) {
env->usp = env->regs[0];
} else {
env->isp = env->regs[0];
}
save_psw = rx_cpu_pack_psw(env);
env->psw_pm = env->psw_i = env->psw_u = 0;
if (do_irq) {
if (do_irq & CPU_INTERRUPT_FIR) {
env->bpc = env->pc;
env->bpsw = save_psw;
env->pc = env->fintv;
env->psw_ipl = 15;
cs->interrupt_request &= ~CPU_INTERRUPT_FIR;
qemu_set_irq(env->ack, env->ack_irq);
qemu_log_mask(CPU_LOG_INT, "fast interrupt raised\n");
} else if (do_irq & CPU_INTERRUPT_HARD) {
env->isp -= 4;
cpu_stl_data(env, env->isp, save_psw);
env->isp -= 4;
cpu_stl_data(env, env->isp, env->pc);
env->pc = cpu_ldl_data(env, env->intb + env->ack_irq * 4);
env->psw_ipl = env->ack_ipl;
cs->interrupt_request &= ~CPU_INTERRUPT_HARD;
qemu_set_irq(env->ack, env->ack_irq);
qemu_log_mask(CPU_LOG_INT,
"interrupt 0x%02x raised\n", env->ack_irq);
}
} else {
uint32_t vec = cs->exception_index;
const char *expname = "unknown exception";
env->isp -= 4;
cpu_stl_data(env, env->isp, save_psw);
env->isp -= 4;
cpu_stl_data(env, env->isp, env->pc);
if (vec < 0x100) {
env->pc = cpu_ldl_data(env, 0xffffffc0 + vec * 4);
} else {
env->pc = cpu_ldl_data(env, env->intb + (vec & 0xff) * 4);
}
switch (vec) {
case 20:
expname = "privilege violation";
break;
case 21:
expname = "access exception";
break;
case 23:
expname = "illegal instruction";
break;
case 25:
expname = "fpu exception";
break;
case 30:
expname = "non-maskable interrupt";
break;
case 0x100 ... 0x1ff:
expname = "unconditional trap";
}
qemu_log_mask(CPU_LOG_INT, "exception 0x%02x [%s] raised\n",
(vec & 0xff), expname);
}
env->regs[0] = env->isp;
}
bool rx_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
{
RXCPU *cpu = RX_CPU(cs);
CPURXState *env = &cpu->env;
int accept = 0;
/* hardware interrupt (Normal) */
if ((interrupt_request & CPU_INTERRUPT_HARD) &&
env->psw_i && (env->psw_ipl < env->req_ipl)) {
env->ack_irq = env->req_irq;
env->ack_ipl = env->req_ipl;
accept = 1;
}
/* hardware interrupt (FIR) */
if ((interrupt_request & CPU_INTERRUPT_FIR) &&
env->psw_i && (env->psw_ipl < 15)) {
accept = 1;
}
if (accept) {
rx_cpu_do_interrupt(cs);
return true;
}
return false;
}
hwaddr rx_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
{
return addr;
}
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