463 lines
9.3 KiB
C
463 lines
9.3 KiB
C
/*
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* CRIS helper routines
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*
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* Copyright (c) 2007 AXIS Communications
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* Written by Edgar E. Iglesias
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <assert.h>
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#include "exec.h"
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#include "mmu.h"
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#define MMUSUFFIX _mmu
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#ifdef __s390__
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# define GETPC() ((void*)((unsigned long)__builtin_return_address(0) & 0x7fffffffUL))
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#else
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# define GETPC() (__builtin_return_address(0))
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#endif
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#define SHIFT 0
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#include "softmmu_template.h"
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#define SHIFT 1
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#include "softmmu_template.h"
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#define SHIFT 2
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#include "softmmu_template.h"
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#define SHIFT 3
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#include "softmmu_template.h"
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#define D(x)
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/* Try to fill the TLB and return an exception if error. If retaddr is
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NULL, it means that the function was called in C code (i.e. not
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from generated code or from helper.c) */
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/* XXX: fix it to restore all registers */
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void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr)
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{
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TranslationBlock *tb;
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CPUState *saved_env;
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unsigned long pc;
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int ret;
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/* XXX: hack to restore env in all cases, even if not called from
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generated code */
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saved_env = env;
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env = cpu_single_env;
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D(fprintf(logfile, "%s pc=%x tpc=%x ra=%x\n", __func__,
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env->pc, env->debug1, retaddr));
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ret = cpu_cris_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
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if (__builtin_expect(ret, 0)) {
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if (retaddr) {
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/* now we have a real cpu fault */
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pc = (unsigned long)retaddr;
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tb = tb_find_pc(pc);
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if (tb) {
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/* the PC is inside the translated code. It means that we have
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a virtual CPU fault */
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cpu_restore_state(tb, env, pc, NULL);
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}
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}
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cpu_loop_exit();
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}
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env = saved_env;
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}
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void helper_tlb_update(uint32_t T0)
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{
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#if !defined(CONFIG_USER_ONLY)
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uint32_t vaddr;
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uint32_t srs = env->pregs[PR_SRS];
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if (srs != 1 && srs != 2)
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return;
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vaddr = cris_mmu_tlb_latest_update(env, T0);
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D(fprintf(logfile, "flush old_vaddr=%x vaddr=%x T0=%x\n", vaddr,
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env->sregs[SFR_R_MM_CAUSE] & TARGET_PAGE_MASK, T0));
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tlb_flush_page(env, vaddr);
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#endif
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}
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void helper_tlb_flush(void)
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{
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tlb_flush(env, 1);
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}
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void helper_dump(uint32_t a0, uint32_t a1)
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{
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(fprintf(logfile, "%s: a0=%x a1=%x\n", __func__, a0, a1));
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}
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void helper_dummy(void)
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{
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}
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/* Only used for debugging at the moment. */
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void helper_rfe(void)
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{
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D(fprintf(logfile, "rfe: erp=%x pid=%x ccs=%x btarget=%x\n",
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env->pregs[PR_ERP], env->pregs[PR_PID],
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env->pregs[PR_CCS],
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env->btarget));
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}
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void helper_store(uint32_t a0)
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{
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if (env->pregs[PR_CCS] & P_FLAG )
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{
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cpu_abort(env, "cond_store_failed! pc=%x a0=%x\n",
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env->pc, a0);
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}
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}
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void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,
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int is_asi)
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{
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D(printf("%s addr=%x w=%d ex=%d asi=%d\n",
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__func__, addr, is_write, is_exec, is_asi));
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}
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static void evaluate_flags_writeback(uint32_t flags)
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{
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int x;
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/* Extended arithmetics, leave the z flag alone. */
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env->debug3 = env->pregs[PR_CCS];
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if (env->cc_x_live)
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x = env->cc_x;
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else
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x = env->pregs[PR_CCS] & X_FLAG;
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if ((x || env->cc_op == CC_OP_ADDC)
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&& flags & Z_FLAG)
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env->cc_mask &= ~Z_FLAG;
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/* all insn clear the x-flag except setf or clrf. */
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env->pregs[PR_CCS] &= ~(env->cc_mask | X_FLAG);
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flags &= env->cc_mask;
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env->pregs[PR_CCS] |= flags;
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RETURN();
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}
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void helper_evaluate_flags_muls(void)
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{
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uint32_t src;
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uint32_t dst;
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uint32_t res;
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uint32_t flags = 0;
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/* were gonna have to redo the muls. */
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int64_t tmp, t0 ,t1;
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int32_t mof;
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int dneg;
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src = env->cc_src;
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dst = env->cc_dest;
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res = env->cc_result;
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/* cast into signed values to make GCC sign extend. */
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t0 = (int32_t)src;
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t1 = (int32_t)dst;
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dneg = ((int32_t)res) < 0;
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tmp = t0 * t1;
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mof = tmp >> 32;
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if (tmp == 0)
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flags |= Z_FLAG;
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else if (tmp < 0)
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flags |= N_FLAG;
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if ((dneg && mof != -1)
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|| (!dneg && mof != 0))
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flags |= V_FLAG;
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evaluate_flags_writeback(flags);
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}
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void helper_evaluate_flags_mulu(void)
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{
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uint32_t src;
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uint32_t dst;
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uint32_t res;
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uint32_t flags = 0;
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/* were gonna have to redo the muls. */
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uint64_t tmp, t0 ,t1;
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uint32_t mof;
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src = env->cc_src;
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dst = env->cc_dest;
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res = env->cc_result;
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/* cast into signed values to make GCC sign extend. */
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t0 = src;
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t1 = dst;
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tmp = t0 * t1;
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mof = tmp >> 32;
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if (tmp == 0)
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flags |= Z_FLAG;
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else if (tmp >> 63)
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flags |= N_FLAG;
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if (mof)
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flags |= V_FLAG;
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evaluate_flags_writeback(flags);
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}
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void helper_evaluate_flags_mcp(void)
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{
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uint32_t src;
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uint32_t dst;
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uint32_t res;
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uint32_t flags = 0;
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src = env->cc_src;
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dst = env->cc_dest;
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res = env->cc_result;
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if ((res & 0x80000000L) != 0L)
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{
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flags |= N_FLAG;
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if (((src & 0x80000000L) == 0L)
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&& ((dst & 0x80000000L) == 0L))
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{
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flags |= V_FLAG;
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}
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else if (((src & 0x80000000L) != 0L) &&
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((dst & 0x80000000L) != 0L))
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{
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flags |= R_FLAG;
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}
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}
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else
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{
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if (res == 0L)
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flags |= Z_FLAG;
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if (((src & 0x80000000L) != 0L)
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&& ((dst & 0x80000000L) != 0L))
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flags |= V_FLAG;
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if ((dst & 0x80000000L) != 0L
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|| (src & 0x80000000L) != 0L)
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flags |= R_FLAG;
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}
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evaluate_flags_writeback(flags);
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}
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void helper_evaluate_flags_alu_4(void)
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{
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uint32_t src;
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uint32_t dst;
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uint32_t res;
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uint32_t flags = 0;
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src = env->cc_src;
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dst = env->cc_dest;
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res = env->cc_result;
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if ((res & 0x80000000L) != 0L)
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{
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flags |= N_FLAG;
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if (((src & 0x80000000L) == 0L)
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&& ((dst & 0x80000000L) == 0L))
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{
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flags |= V_FLAG;
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}
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else if (((src & 0x80000000L) != 0L) &&
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((dst & 0x80000000L) != 0L))
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{
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flags |= C_FLAG;
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}
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}
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else
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{
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if (res == 0L)
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flags |= Z_FLAG;
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if (((src & 0x80000000L) != 0L)
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&& ((dst & 0x80000000L) != 0L))
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flags |= V_FLAG;
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if ((dst & 0x80000000L) != 0L
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|| (src & 0x80000000L) != 0L)
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flags |= C_FLAG;
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}
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if (env->cc_op == CC_OP_SUB
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|| env->cc_op == CC_OP_CMP) {
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flags ^= C_FLAG;
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}
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evaluate_flags_writeback(flags);
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}
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void helper_evaluate_flags_move_4 (void)
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{
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uint32_t src;
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uint32_t res;
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uint32_t flags = 0;
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src = env->cc_src;
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res = env->cc_result;
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if ((int32_t)res < 0)
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flags |= N_FLAG;
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else if (res == 0L)
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flags |= Z_FLAG;
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evaluate_flags_writeback(flags);
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}
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void helper_evaluate_flags_move_2 (void)
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{
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uint32_t src;
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uint32_t flags = 0;
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uint16_t res;
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src = env->cc_src;
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res = env->cc_result;
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if ((int16_t)res < 0L)
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flags |= N_FLAG;
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else if (res == 0)
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flags |= Z_FLAG;
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evaluate_flags_writeback(flags);
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}
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/* TODO: This is expensive. We could split things up and only evaluate part of
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CCR on a need to know basis. For now, we simply re-evaluate everything. */
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void helper_evaluate_flags (void)
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{
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uint32_t src;
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uint32_t dst;
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uint32_t res;
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uint32_t flags = 0;
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src = env->cc_src;
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dst = env->cc_dest;
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res = env->cc_result;
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/* Now, evaluate the flags. This stuff is based on
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Per Zander's CRISv10 simulator. */
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switch (env->cc_size)
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{
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case 1:
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if ((res & 0x80L) != 0L)
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{
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flags |= N_FLAG;
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if (((src & 0x80L) == 0L)
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&& ((dst & 0x80L) == 0L))
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{
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flags |= V_FLAG;
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}
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else if (((src & 0x80L) != 0L)
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&& ((dst & 0x80L) != 0L))
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{
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flags |= C_FLAG;
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}
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}
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else
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{
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if ((res & 0xFFL) == 0L)
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{
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flags |= Z_FLAG;
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}
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if (((src & 0x80L) != 0L)
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&& ((dst & 0x80L) != 0L))
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{
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flags |= V_FLAG;
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}
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if ((dst & 0x80L) != 0L
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|| (src & 0x80L) != 0L)
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{
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flags |= C_FLAG;
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}
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}
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break;
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case 2:
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if ((res & 0x8000L) != 0L)
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{
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flags |= N_FLAG;
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if (((src & 0x8000L) == 0L)
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&& ((dst & 0x8000L) == 0L))
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{
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flags |= V_FLAG;
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}
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else if (((src & 0x8000L) != 0L)
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&& ((dst & 0x8000L) != 0L))
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{
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flags |= C_FLAG;
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}
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}
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else
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{
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if ((res & 0xFFFFL) == 0L)
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{
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flags |= Z_FLAG;
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}
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if (((src & 0x8000L) != 0L)
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&& ((dst & 0x8000L) != 0L))
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{
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flags |= V_FLAG;
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}
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if ((dst & 0x8000L) != 0L
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|| (src & 0x8000L) != 0L)
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{
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flags |= C_FLAG;
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}
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}
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break;
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case 4:
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if ((res & 0x80000000L) != 0L)
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{
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flags |= N_FLAG;
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if (((src & 0x80000000L) == 0L)
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&& ((dst & 0x80000000L) == 0L))
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{
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flags |= V_FLAG;
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}
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else if (((src & 0x80000000L) != 0L) &&
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((dst & 0x80000000L) != 0L))
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{
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flags |= C_FLAG;
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}
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}
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else
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{
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if (res == 0L)
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flags |= Z_FLAG;
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if (((src & 0x80000000L) != 0L)
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&& ((dst & 0x80000000L) != 0L))
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flags |= V_FLAG;
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if ((dst & 0x80000000L) != 0L
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|| (src & 0x80000000L) != 0L)
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flags |= C_FLAG;
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}
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break;
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default:
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break;
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}
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if (env->cc_op == CC_OP_SUB
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|| env->cc_op == CC_OP_CMP) {
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flags ^= C_FLAG;
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}
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evaluate_flags_writeback(flags);
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}
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