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/*
* OpenRISC interrupt.
*
* Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "exec/gdbstub.h"
#include "qemu/host-utils.h"
#ifndef CONFIG_USER_ONLY
#include "hw/loader.h"
#endif
void openrisc_cpu_do_interrupt(CPUState *cs)
{
OpenRISCCPU *cpu = OPENRISC_CPU(cs);
CPUOpenRISCState *env = &cpu->env;
int exception = cs->exception_index;
env->epcr = env->pc;
if (exception == EXCP_SYSCALL) {
env->epcr += 4;
}
/* When we have an illegal instruction the error effective address
shall be set to the illegal instruction address. */
if (exception == EXCP_ILLEGAL) {
env->eear = env->pc;
}
/* During exceptions esr is populared with the pre-exception sr. */
env->esr = cpu_get_sr(env);
/* In parallel sr is updated to disable mmu, interrupts, timers and
set the delay slot exception flag. */
env->sr &= ~SR_DME;
env->sr &= ~SR_IME;
env->sr |= SR_SM;
env->sr &= ~SR_IEE;
env->sr &= ~SR_TEE;
env->pmr &= ~PMR_DME;
env->pmr &= ~PMR_SME;
env->lock_addr = -1;
/* Set/clear dsx to indicate if we are in a delay slot exception. */
if (env->dflag) {
env->dflag = 0;
env->sr |= SR_DSX;
env->epcr -= 4;
} else {
env->sr &= ~SR_DSX;
}
if (exception > 0 && exception < EXCP_NR) {
static const char * const int_name[EXCP_NR] = {
[EXCP_RESET] = "RESET",
[EXCP_BUSERR] = "BUSERR (bus error)",
[EXCP_DPF] = "DFP (data protection fault)",
[EXCP_IPF] = "IPF (code protection fault)",
[EXCP_TICK] = "TICK (timer interrupt)",
[EXCP_ALIGN] = "ALIGN",
[EXCP_ILLEGAL] = "ILLEGAL",
[EXCP_INT] = "INT (device interrupt)",
[EXCP_DTLBMISS] = "DTLBMISS (data tlb miss)",
[EXCP_ITLBMISS] = "ITLBMISS (code tlb miss)",
[EXCP_RANGE] = "RANGE",
[EXCP_SYSCALL] = "SYSCALL",
[EXCP_FPE] = "FPE",
[EXCP_TRAP] = "TRAP",
};
qemu_log_mask(CPU_LOG_INT, "INT: %s\n", int_name[exception]);
hwaddr vect_pc = exception << 8;
if (env->cpucfgr & CPUCFGR_EVBARP) {
vect_pc |= env->evbar;
}
if (env->sr & SR_EPH) {
vect_pc |= 0xf0000000;
}
env->pc = vect_pc;
} else {
cpu_abort(cs, "Unhandled exception 0x%x\n", exception);
}
cs->exception_index = -1;
}
bool openrisc_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
{
OpenRISCCPU *cpu = OPENRISC_CPU(cs);
CPUOpenRISCState *env = &cpu->env;
int idx = -1;
if ((interrupt_request & CPU_INTERRUPT_HARD) && (env->sr & SR_IEE)) {
idx = EXCP_INT;
}
if ((interrupt_request & CPU_INTERRUPT_TIMER) && (env->sr & SR_TEE)) {
idx = EXCP_TICK;
}
if (idx >= 0) {
cs->exception_index = idx;
openrisc_cpu_do_interrupt(cs);
return true;
}
return false;
}
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