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3a03087019
Implement these out of line, so that tcg global temps (aka the architectural registers) are synced back to tcg storage as required. This makes sure that we get the proper results when status.PRS == status.CRS. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220421151735.31996-55-richard.henderson@linaro.org>
102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
/*
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* Altera Nios II helper routines.
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*
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* Copyright (C) 2012 Chris Wulff <crwulff@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 2.1 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
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* <http://www.gnu.org/licenses/lgpl-2.1.html>
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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/helper-proto.h"
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#include "exec/exec-all.h"
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#include "qemu/main-loop.h"
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void helper_raise_exception(CPUNios2State *env, uint32_t index)
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{
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CPUState *cs = env_cpu(env);
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cs->exception_index = index;
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cpu_loop_exit(cs);
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}
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static void maybe_raise_div(CPUNios2State *env, uintptr_t ra)
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{
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Nios2CPU *cpu = env_archcpu(env);
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CPUState *cs = env_cpu(env);
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if (cpu->diverr_present) {
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cs->exception_index = EXCP_DIV;
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cpu_loop_exit_restore(cs, ra);
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}
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}
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int32_t helper_divs(CPUNios2State *env, int32_t num, int32_t den)
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{
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if (unlikely(den == 0) || unlikely(den == -1 && num == INT32_MIN)) {
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maybe_raise_div(env, GETPC());
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return num; /* undefined */
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}
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return num / den;
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}
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uint32_t helper_divu(CPUNios2State *env, uint32_t num, uint32_t den)
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{
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if (unlikely(den == 0)) {
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maybe_raise_div(env, GETPC());
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return num; /* undefined */
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}
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return num / den;
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}
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#ifndef CONFIG_USER_ONLY
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void helper_eret(CPUNios2State *env, uint32_t new_status, uint32_t new_pc)
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{
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Nios2CPU *cpu = env_archcpu(env);
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CPUState *cs = env_cpu(env);
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if (unlikely(new_pc & 3)) {
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env->ctrl[CR_BADADDR] = new_pc;
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cs->exception_index = EXCP_UNALIGND;
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cpu_loop_exit_restore(cs, GETPC());
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}
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/*
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* Both estatus and bstatus have no constraints on write;
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* do not allow reserved fields in status to be set.
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* TODO: more than this is required for shadow registers.
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*/
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new_status &= cpu->cr_state[CR_STATUS].writable;
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env->ctrl[CR_STATUS] = new_status;
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env->pc = new_pc;
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cpu_loop_exit(cs);
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}
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/*
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* RDPRS and WRPRS are implemented out of line so that if PRS == CRS,
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* all of the tcg global temporaries are synced back to ENV.
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*/
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uint32_t helper_rdprs(CPUNios2State *env, uint32_t regno)
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{
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unsigned prs = FIELD_EX32(env->ctrl[CR_STATUS], CR_STATUS, PRS);
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return env->shadow_regs[prs][regno];
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}
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void helper_wrprs(CPUNios2State *env, uint32_t regno, uint32_t val)
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{
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unsigned prs = FIELD_EX32(env->ctrl[CR_STATUS], CR_STATUS, PRS);
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env->shadow_regs[prs][regno] = val;
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}
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#endif /* !CONFIG_USER_ONLY */
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