ae52bd96ce
This patch corrects several misbehaviors during an interrupt process. Most of the time the pc is already correct and therefore no special treatment of the exceptions is necessary. Tested by checking crashing programs which otherwise work in or1ksim. Signed-off-by: Sebastian Macke <sebastian@macke.de> Reviewed-by: Jia Liu <proljc@gmail.com> Signed-off-by: Jia Liu <proljc@gmail.com>
66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
/*
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* OpenRISC interrupt.
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*
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* Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "cpu.h"
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#include "qemu-common.h"
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#include "exec/gdbstub.h"
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#include "qemu/host-utils.h"
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#ifndef CONFIG_USER_ONLY
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#include "hw/loader.h"
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#endif
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void openrisc_cpu_do_interrupt(CPUState *cs)
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{
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OpenRISCCPU *cpu = OPENRISC_CPU(cs);
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CPUOpenRISCState *env = &cpu->env;
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#ifndef CONFIG_USER_ONLY
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env->epcr = env->pc;
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if (env->flags & D_FLAG) {
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env->flags &= ~D_FLAG;
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env->sr |= SR_DSX;
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env->epcr -= 4;
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}
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if (env->exception_index == EXCP_SYSCALL) {
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env->epcr += 4;
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}
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/* For machine-state changed between user-mode and supervisor mode,
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we need flush TLB when we enter&exit EXCP. */
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tlb_flush(env, 1);
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env->esr = env->sr;
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env->sr &= ~SR_DME;
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env->sr &= ~SR_IME;
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env->sr |= SR_SM;
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env->sr &= ~SR_IEE;
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env->sr &= ~SR_TEE;
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env->tlb->cpu_openrisc_map_address_data = &cpu_openrisc_get_phys_nommu;
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env->tlb->cpu_openrisc_map_address_code = &cpu_openrisc_get_phys_nommu;
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if (env->exception_index > 0 && env->exception_index < EXCP_NR) {
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env->pc = (env->exception_index << 8);
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} else {
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cpu_abort(env, "Unhandled exception 0x%x\n", env->exception_index);
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}
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#endif
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env->exception_index = -1;
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}
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