6597c28d61
The HW does not special-case r0, but the ABI specifies that r0 should contain 0. If we expose this fact to the optimizer, we can simplify a lot of the generated code. We must of course verify that r0==0, but that is trivial to do with a TB flag. Signed-off-by: Richard Henderson <rth@twiddle.net>
63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
/*
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* OpenRISC exception helper routines
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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 "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/exec-all.h"
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#include "exec/helper-proto.h"
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#include "exec/exec-all.h"
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#include "exception.h"
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void HELPER(exception)(CPUOpenRISCState *env, uint32_t excp)
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{
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OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
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raise_exception(cpu, excp);
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}
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static void QEMU_NORETURN do_range(CPUOpenRISCState *env, uintptr_t pc)
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{
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OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
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CPUState *cs = CPU(cpu);
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cs->exception_index = EXCP_RANGE;
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cpu_loop_exit_restore(cs, pc);
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}
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void HELPER(ove_cy)(CPUOpenRISCState *env)
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{
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if (env->sr_cy) {
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do_range(env, GETPC());
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}
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}
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void HELPER(ove_ov)(CPUOpenRISCState *env)
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{
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if (env->sr_ov < 0) {
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do_range(env, GETPC());
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}
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}
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void HELPER(ove_cyov)(CPUOpenRISCState *env)
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{
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if (env->sr_cy || env->sr_ov < 0) {
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do_range(env, GETPC());
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}
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}
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