target-cris/op_helper.c - qemu - Git at Google

 /*
  *  CRIS helper routines
  *
  *  Copyright (c) 2007 AXIS Communications
  *  Written by Edgar E. Iglesias
  *
  * 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 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 "cpu.h"
 #include "dyngen-exec.h"
 #include "mmu.h"
 #include "helper.h"
 #include "host-utils.h"

 //#define CRIS_OP_HELPER_DEBUG


 #ifdef CRIS_OP_HELPER_DEBUG
 #define D(x) x
 #define D_LOG(...) qemu_log(__VA__ARGS__)
 #else
 #define D(x)
 #define D_LOG(...) do { } while (0)
 #endif

 #if !defined(CONFIG_USER_ONLY)
 #include "softmmu_exec.h"

 #define MMUSUFFIX _mmu

 #define SHIFT 0
 #include "softmmu_template.h"

 #define SHIFT 1
 #include "softmmu_template.h"

 #define SHIFT 2
 #include "softmmu_template.h"

 #define SHIFT 3
 #include "softmmu_template.h"

 /* Try to fill the TLB and return an exception if error. If retaddr is
    NULL, it means that the function was called in C code (i.e. not
    from generated code or from helper.c) */
 /* XXX: fix it to restore all registers */
 void tlb_fill(CPUCRISState *env1, target_ulong addr, int is_write, int mmu_idx,
               uintptr_t retaddr)
 {
     TranslationBlock *tb;
     CPUCRISState *saved_env;
     int ret;

     saved_env = env;
     env = env1;

     D_LOG("%s pc=%x tpc=%x ra=%p\n", __func__,
           env->pc, env->debug1, (void *)retaddr);
     ret = cpu_cris_handle_mmu_fault(env, addr, is_write, mmu_idx);
     if (unlikely(ret)) {
         if (retaddr) {
             /* now we have a real cpu fault */
             tb = tb_find_pc(retaddr);
             if (tb) {
                 /* the PC is inside the translated code. It means that we have
                    a virtual CPU fault */
                 cpu_restore_state(tb, env, retaddr);

 		/* Evaluate flags after retranslation.  */
                 helper_top_evaluate_flags(env);
             }
         }
         cpu_loop_exit(env);
     }
     env = saved_env;
 }

 #endif

 void helper_raise_exception(CPUCRISState *env, uint32_t index)
 {
 	env->exception_index = index;
         cpu_loop_exit(env);
 }

 void helper_tlb_flush_pid(CPUCRISState *env, uint32_t pid)
 {
 #if !defined(CONFIG_USER_ONLY)
 	pid &= 0xff;
 	if (pid != (env->pregs[PR_PID] & 0xff))
 		cris_mmu_flush_pid(env, env->pregs[PR_PID]);
 #endif
 }

 void helper_spc_write(CPUCRISState *env, uint32_t new_spc)
 {
 #if !defined(CONFIG_USER_ONLY)
 	tlb_flush_page(env, env->pregs[PR_SPC]);
 	tlb_flush_page(env, new_spc);
 #endif
 }

 void helper_dump(uint32_t a0, uint32_t a1, uint32_t a2)
 {
 	qemu_log("%s: a0=%x a1=%x\n", __func__, a0, a1);
 }

 /* Used by the tlb decoder.  */
 #define EXTRACT_FIELD(src, start, end) \
 	    (((src) >> start) & ((1 << (end - start + 1)) - 1))

 void helper_movl_sreg_reg(CPUCRISState *env, uint32_t sreg, uint32_t reg)
 {
 	uint32_t srs;
 	srs = env->pregs[PR_SRS];
 	srs &= 3;
 	env->sregs[srs][sreg] = env->regs[reg];

 #if !defined(CONFIG_USER_ONLY)
 	if (srs == 1 || srs == 2) {
 		if (sreg == 6) {
 			/* Writes to tlb-hi write to mm_cause as a side
 			   effect.  */
 			env->sregs[SFR_RW_MM_TLB_HI] = env->regs[reg];
 			env->sregs[SFR_R_MM_CAUSE] = env->regs[reg];
 		}
 		else if (sreg == 5) {
 			uint32_t set;
 			uint32_t idx;
 			uint32_t lo, hi;
 			uint32_t vaddr;
 			int tlb_v;

 			idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
 			set >>= 4;
 			set &= 3;

 			idx &= 15;
 			/* We've just made a write to tlb_lo.  */
 			lo = env->sregs[SFR_RW_MM_TLB_LO];
 			/* Writes are done via r_mm_cause.  */
 			hi = env->sregs[SFR_R_MM_CAUSE];

 			vaddr = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].hi,
 					      13, 31);
 			vaddr <<= TARGET_PAGE_BITS;
 			tlb_v = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].lo,
 					    3, 3);
 			env->tlbsets[srs - 1][set][idx].lo = lo;
 			env->tlbsets[srs - 1][set][idx].hi = hi;

 			D_LOG("tlb flush vaddr=%x v=%d pc=%x\n",
 				  vaddr, tlb_v, env->pc);
 			if (tlb_v) {
 				tlb_flush_page(env, vaddr);
 			}
 		}
 	}
 #endif
 }

 void helper_movl_reg_sreg(CPUCRISState *env, uint32_t reg, uint32_t sreg)
 {
 	uint32_t srs;
 	env->pregs[PR_SRS] &= 3;
 	srs = env->pregs[PR_SRS];

 #if !defined(CONFIG_USER_ONLY)
 	if (srs == 1 || srs == 2)
 	{
 		uint32_t set;
 		uint32_t idx;
 		uint32_t lo, hi;

 		idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
 		set >>= 4;
 		set &= 3;
 		idx &= 15;

 		/* Update the mirror regs.  */
 		hi = env->tlbsets[srs - 1][set][idx].hi;
 		lo = env->tlbsets[srs - 1][set][idx].lo;
 		env->sregs[SFR_RW_MM_TLB_HI] = hi;
 		env->sregs[SFR_RW_MM_TLB_LO] = lo;
 	}
 #endif
 	env->regs[reg] = env->sregs[srs][sreg];
 }

 static void cris_ccs_rshift(CPUCRISState *env)
 {
 	uint32_t ccs;

 	/* Apply the ccs shift.  */
 	ccs = env->pregs[PR_CCS];
 	ccs = (ccs & 0xc0000000) | ((ccs & 0x0fffffff) >> 10);
 	if (ccs & U_FLAG)
 	{
 		/* Enter user mode.  */
 		env->ksp = env->regs[R_SP];
 		env->regs[R_SP] = env->pregs[PR_USP];
 	}

 	env->pregs[PR_CCS] = ccs;
 }

 void helper_rfe(CPUCRISState *env)
 {
 	int rflag = env->pregs[PR_CCS] & R_FLAG;

 	D_LOG("rfe: erp=%x pid=%x ccs=%x btarget=%x\n",
 		 env->pregs[PR_ERP], env->pregs[PR_PID],
 		 env->pregs[PR_CCS],
 		 env->btarget);

 	cris_ccs_rshift(env);

 	/* RFE sets the P_FLAG only if the R_FLAG is not set.  */
 	if (!rflag)
 		env->pregs[PR_CCS] |= P_FLAG;
 }

 void helper_rfn(CPUCRISState *env)
 {
 	int rflag = env->pregs[PR_CCS] & R_FLAG;

 	D_LOG("rfn: erp=%x pid=%x ccs=%x btarget=%x\n",
 		 env->pregs[PR_ERP], env->pregs[PR_PID],
 		 env->pregs[PR_CCS],
 		 env->btarget);

 	cris_ccs_rshift(env);

 	/* Set the P_FLAG only if the R_FLAG is not set.  */
 	if (!rflag)
 		env->pregs[PR_CCS] |= P_FLAG;

 	/* Always set the M flag.  */
 	env->pregs[PR_CCS] |= M_FLAG_V32;
 }

 uint32_t helper_lz(uint32_t t0)
 {
 	return clz32(t0);
 }

 uint32_t helper_btst(CPUCRISState *env, uint32_t t0, uint32_t t1, uint32_t ccs)
 {
 	/* FIXME: clean this up.  */

 	/* des ref:
 	   The N flag is set according to the selected bit in the dest reg.
 	   The Z flag is set if the selected bit and all bits to the right are
 	   zero.
 	   The X flag is cleared.
 	   Other flags are left untouched.
 	   The destination reg is not affected.*/
 	unsigned int fz, sbit, bset, mask, masked_t0;

 	sbit = t1 & 31;
 	bset = !!(t0 & (1 << sbit));
 	mask = sbit == 31 ? -1 : (1 << (sbit + 1)) - 1;
 	masked_t0 = t0 & mask;
 	fz = !(masked_t0 | bset);

 	/* Clear the X, N and Z flags.  */
 	ccs = ccs & ~(X_FLAG | N_FLAG | Z_FLAG);
 	if (env->pregs[PR_VR] < 32)
 		ccs &= ~(V_FLAG | C_FLAG);
 	/* Set the N and Z flags accordingly.  */
 	ccs |= (bset << 3) | (fz << 2);
 	return ccs;
 }

 static inline uint32_t evaluate_flags_writeback(CPUCRISState *env,
                                                 uint32_t flags, uint32_t ccs)
 {
 	unsigned int x, z, mask;

 	/* Extended arithmetics, leave the z flag alone.  */
 	x = env->cc_x;
 	mask = env->cc_mask | X_FLAG;
         if (x) {
 		z = flags & Z_FLAG;
 		mask = mask & ~z;
 	}
 	flags &= mask;

 	/* all insn clear the x-flag except setf or clrf.  */
 	ccs &= ~mask;
 	ccs |= flags;
 	return ccs;
 }

 uint32_t helper_evaluate_flags_muls(CPUCRISState *env,
                                     uint32_t ccs, uint32_t res, uint32_t mof)
 {
 	uint32_t flags = 0;
 	int64_t tmp;
 	int dneg;

 	dneg = ((int32_t)res) < 0;

 	tmp = mof;
 	tmp <<= 32;
 	tmp |= res;
 	if (tmp == 0)
 		flags |= Z_FLAG;
 	else if (tmp < 0)
 		flags |= N_FLAG;
 	if ((dneg && mof != -1)
 	    || (!dneg && mof != 0))
 		flags |= V_FLAG;
         return evaluate_flags_writeback(env, flags, ccs);
 }

 uint32_t helper_evaluate_flags_mulu(CPUCRISState *env,
                                     uint32_t ccs, uint32_t res, uint32_t mof)
 {
 	uint32_t flags = 0;
 	uint64_t tmp;

 	tmp = mof;
 	tmp <<= 32;
 	tmp |= res;
 	if (tmp == 0)
 		flags |= Z_FLAG;
 	else if (tmp >> 63)
 		flags |= N_FLAG;
 	if (mof)
 		flags |= V_FLAG;

         return evaluate_flags_writeback(env, flags, ccs);
 }

 uint32_t helper_evaluate_flags_mcp(CPUCRISState *env, uint32_t ccs,
 				   uint32_t src, uint32_t dst, uint32_t res)
 {
 	uint32_t flags = 0;

 	src = src & 0x80000000;
 	dst = dst & 0x80000000;

 	if ((res & 0x80000000L) != 0L)
 	{
 		flags |= N_FLAG;
 		if (!src && !dst)
 			flags |= V_FLAG;
 		else if (src & dst)
 			flags |= R_FLAG;
 	}
 	else
 	{
 		if (res == 0L)
 			flags |= Z_FLAG;
 		if (src & dst)
 			flags |= V_FLAG;
 		if (dst | src)
 			flags |= R_FLAG;
 	}

         return evaluate_flags_writeback(env, flags, ccs);
 }

 uint32_t helper_evaluate_flags_alu_4(CPUCRISState *env, uint32_t ccs,
 				     uint32_t src, uint32_t dst, uint32_t res)
 {
 	uint32_t flags = 0;

 	src = src & 0x80000000;
 	dst = dst & 0x80000000;

 	if ((res & 0x80000000L) != 0L)
 	{
 		flags |= N_FLAG;
 		if (!src && !dst)
 			flags |= V_FLAG;
 		else if (src & dst)
 			flags |= C_FLAG;
 	}
 	else
 	{
 		if (res == 0L)
 			flags |= Z_FLAG;
 		if (src & dst)
 			flags |= V_FLAG;
 		if (dst | src)
 			flags |= C_FLAG;
 	}

         return evaluate_flags_writeback(env, flags, ccs);
 }

 uint32_t helper_evaluate_flags_sub_4(CPUCRISState *env, uint32_t ccs,
 				     uint32_t src, uint32_t dst, uint32_t res)
 {
 	uint32_t flags = 0;

 	src = (~src) & 0x80000000;
 	dst = dst & 0x80000000;

 	if ((res & 0x80000000L) != 0L)
 	{
 		flags |= N_FLAG;
 		if (!src && !dst)
 			flags |= V_FLAG;
 		else if (src & dst)
 			flags |= C_FLAG;
 	}
 	else
 	{
 		if (res == 0L)
 			flags |= Z_FLAG;
 		if (src & dst)
 			flags |= V_FLAG;
 		if (dst | src)
 			flags |= C_FLAG;
 	}

 	flags ^= C_FLAG;
         return evaluate_flags_writeback(env, flags, ccs);
 }

 uint32_t helper_evaluate_flags_move_4(CPUCRISState *env,
                                       uint32_t ccs, uint32_t res)
 {
 	uint32_t flags = 0;

 	if ((int32_t)res < 0)
 		flags |= N_FLAG;
 	else if (res == 0L)
 		flags |= Z_FLAG;

         return evaluate_flags_writeback(env, flags, ccs);
 }
 uint32_t helper_evaluate_flags_move_2(CPUCRISState *env,
                                       uint32_t ccs, uint32_t res)
 {
 	uint32_t flags = 0;

 	if ((int16_t)res < 0L)
 		flags |= N_FLAG;
 	else if (res == 0)
 		flags |= Z_FLAG;

         return evaluate_flags_writeback(env, flags, ccs);
 }

 /* TODO: This is expensive. We could split things up and only evaluate part of
    CCR on a need to know basis. For now, we simply re-evaluate everything.  */
 void helper_evaluate_flags(CPUCRISState *env)
 {
 	uint32_t src, dst, res;
 	uint32_t flags = 0;

 	src = env->cc_src;
 	dst = env->cc_dest;
 	res = env->cc_result;

 	if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
 		src = ~src;

 	/* Now, evaluate the flags. This stuff is based on
 	   Per Zander's CRISv10 simulator.  */
 	switch (env->cc_size)
 	{
 		case 1:
 			if ((res & 0x80L) != 0L)
 			{
 				flags |= N_FLAG;
 				if (((src & 0x80L) == 0L)
 				    && ((dst & 0x80L) == 0L))
 				{
 					flags |= V_FLAG;
 				}
 				else if (((src & 0x80L) != 0L)
 					 && ((dst & 0x80L) != 0L))
 				{
 					flags |= C_FLAG;
 				}
 			}
 			else
 			{
 				if ((res & 0xFFL) == 0L)
 				{
 					flags |= Z_FLAG;
 				}
 				if (((src & 0x80L) != 0L)
 				    && ((dst & 0x80L) != 0L))
 				{
 					flags |= V_FLAG;
 				}
 				if ((dst & 0x80L) != 0L
 				    || (src & 0x80L) != 0L)
 				{
 					flags |= C_FLAG;
 				}
 			}
 			break;
 		case 2:
 			if ((res & 0x8000L) != 0L)
 			{
 				flags |= N_FLAG;
 				if (((src & 0x8000L) == 0L)
 				    && ((dst & 0x8000L) == 0L))
 				{
 					flags |= V_FLAG;
 				}
 				else if (((src & 0x8000L) != 0L)
 					 && ((dst & 0x8000L) != 0L))
 				{
 					flags |= C_FLAG;
 				}
 			}
 			else
 			{
 				if ((res & 0xFFFFL) == 0L)
 				{
 					flags |= Z_FLAG;
 				}
 				if (((src & 0x8000L) != 0L)
 				    && ((dst & 0x8000L) != 0L))
 				{
 					flags |= V_FLAG;
 				}
 				if ((dst & 0x8000L) != 0L
 				    || (src & 0x8000L) != 0L)
 				{
 					flags |= C_FLAG;
 				}
 			}
 			break;
 		case 4:
 			if ((res & 0x80000000L) != 0L)
 			{
 				flags |= N_FLAG;
 				if (((src & 0x80000000L) == 0L)
 				    && ((dst & 0x80000000L) == 0L))
 				{
 					flags |= V_FLAG;
 				}
 				else if (((src & 0x80000000L) != 0L) &&
 					 ((dst & 0x80000000L) != 0L))
 				{
 					flags |= C_FLAG;
 				}
 			}
 			else
 			{
 				if (res == 0L)
 					flags |= Z_FLAG;
 				if (((src & 0x80000000L) != 0L)
 				    && ((dst & 0x80000000L) != 0L))
 					flags |= V_FLAG;
 				if ((dst & 0x80000000L) != 0L
 				    || (src & 0x80000000L) != 0L)
 					flags |= C_FLAG;
 			}
 			break;
 		default:
 			break;
 	}

 	if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
 		flags ^= C_FLAG;

         env->pregs[PR_CCS] = evaluate_flags_writeback(env, flags,
                                                       env->pregs[PR_CCS]);
 }

 void helper_top_evaluate_flags(CPUCRISState *env)
 {
 	switch (env->cc_op)
 	{
 		case CC_OP_MCP:
                         env->pregs[PR_CCS] = helper_evaluate_flags_mcp(env,
 					env->pregs[PR_CCS], env->cc_src,
 					env->cc_dest, env->cc_result);
 			break;
 		case CC_OP_MULS:
                         env->pregs[PR_CCS] = helper_evaluate_flags_muls(env,
 					env->pregs[PR_CCS], env->cc_result,
 					env->pregs[PR_MOF]);
 			break;
 		case CC_OP_MULU:
                         env->pregs[PR_CCS] = helper_evaluate_flags_mulu(env,
 					env->pregs[PR_CCS], env->cc_result,
 					env->pregs[PR_MOF]);
 			break;
 		case CC_OP_MOVE:
 		case CC_OP_AND:
 		case CC_OP_OR:
 		case CC_OP_XOR:
 		case CC_OP_ASR:
 		case CC_OP_LSR:
 		case CC_OP_LSL:
 		switch (env->cc_size)
 		{
 			case 4:
 				env->pregs[PR_CCS] =
                                         helper_evaluate_flags_move_4(env,
 							env->pregs[PR_CCS],
 							env->cc_result);
 				break;
 			case 2:
 				env->pregs[PR_CCS] =
                                         helper_evaluate_flags_move_2(env,
 							env->pregs[PR_CCS],
 							env->cc_result);
 				break;
 			default:
                                 helper_evaluate_flags(env);
 				break;
 		}
 		break;
 		case CC_OP_FLAGS:
 			/* live.  */
 			break;
 		case CC_OP_SUB:
 		case CC_OP_CMP:
 			if (env->cc_size == 4)
 				env->pregs[PR_CCS] =
                                         helper_evaluate_flags_sub_4(env,
 						env->pregs[PR_CCS],
 						env->cc_src, env->cc_dest,
 						env->cc_result);
 			else
                                 helper_evaluate_flags(env);
 			break;
 		default:
 		{
 			switch (env->cc_size)
 			{
 			case 4:
 				env->pregs[PR_CCS] =
                                         helper_evaluate_flags_alu_4(env,
 						env->pregs[PR_CCS],
 						env->cc_src, env->cc_dest,
 						env->cc_result);
 				break;
 			default:
                                 helper_evaluate_flags(env);
 				break;
 			}
 		}
 		break;
 	}
 }
	/*
	* CRIS helper routines
	*
	* Copyright (c) 2007 AXIS Communications
	* Written by Edgar E. Iglesias
	*
	* 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 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 "cpu.h"
	#include "dyngen-exec.h"
	#include "mmu.h"
	#include "helper.h"
	#include "host-utils.h"

	//#define CRIS_OP_HELPER_DEBUG


	#ifdef CRIS_OP_HELPER_DEBUG
	#define D(x) x
	#define D_LOG(...) qemu_log(__VA__ARGS__)
	#else
	#define D(x)
	#define D_LOG(...) do { } while (0)
	#endif

	#if !defined(CONFIG_USER_ONLY)
	#include "softmmu_exec.h"

	#define MMUSUFFIX _mmu

	#define SHIFT 0
	#include "softmmu_template.h"

	#define SHIFT 1
	#include "softmmu_template.h"

	#define SHIFT 2
	#include "softmmu_template.h"

	#define SHIFT 3
	#include "softmmu_template.h"

	/* Try to fill the TLB and return an exception if error. If retaddr is
	NULL, it means that the function was called in C code (i.e. not
	from generated code or from helper.c) */
	/* XXX: fix it to restore all registers */
	void tlb_fill(CPUCRISState *env1, target_ulong addr, int is_write, int mmu_idx,
	uintptr_t retaddr)
	{
	TranslationBlock *tb;
	CPUCRISState *saved_env;
	int ret;

	saved_env = env;
	env = env1;

	D_LOG("%s pc=%x tpc=%x ra=%p\n", __func__,
	env->pc, env->debug1, (void *)retaddr);
	ret = cpu_cris_handle_mmu_fault(env, addr, is_write, mmu_idx);
	if (unlikely(ret)) {
	if (retaddr) {
	/* now we have a real cpu fault */
	tb = tb_find_pc(retaddr);
	if (tb) {
	/* the PC is inside the translated code. It means that we have
	a virtual CPU fault */
	cpu_restore_state(tb, env, retaddr);

	/* Evaluate flags after retranslation. */
	helper_top_evaluate_flags(env);
	}
	}
	cpu_loop_exit(env);
	}
	env = saved_env;
	}

	#endif

	void helper_raise_exception(CPUCRISState *env, uint32_t index)
	{
	env->exception_index = index;
	cpu_loop_exit(env);
	}

	void helper_tlb_flush_pid(CPUCRISState *env, uint32_t pid)
	{
	#if !defined(CONFIG_USER_ONLY)
	pid &= 0xff;
	if (pid != (env->pregs[PR_PID] & 0xff))
	cris_mmu_flush_pid(env, env->pregs[PR_PID]);
	#endif
	}

	void helper_spc_write(CPUCRISState *env, uint32_t new_spc)
	{
	#if !defined(CONFIG_USER_ONLY)
	tlb_flush_page(env, env->pregs[PR_SPC]);
	tlb_flush_page(env, new_spc);
	#endif
	}

	void helper_dump(uint32_t a0, uint32_t a1, uint32_t a2)
	{
	qemu_log("%s: a0=%x a1=%x\n", __func__, a0, a1);
	}

	/* Used by the tlb decoder. */
	#define EXTRACT_FIELD(src, start, end) \
	(((src) >> start) & ((1 << (end - start + 1)) - 1))

	void helper_movl_sreg_reg(CPUCRISState *env, uint32_t sreg, uint32_t reg)
	{
	uint32_t srs;
	srs = env->pregs[PR_SRS];
	srs &= 3;
	env->sregs[srs][sreg] = env->regs[reg];

	#if !defined(CONFIG_USER_ONLY)
	if (srs == 1 \|\| srs == 2) {
	if (sreg == 6) {
	/* Writes to tlb-hi write to mm_cause as a side
	effect. */
	env->sregs[SFR_RW_MM_TLB_HI] = env->regs[reg];
	env->sregs[SFR_R_MM_CAUSE] = env->regs[reg];
	}
	else if (sreg == 5) {
	uint32_t set;
	uint32_t idx;
	uint32_t lo, hi;
	uint32_t vaddr;
	int tlb_v;

	idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
	set >>= 4;
	set &= 3;

	idx &= 15;
	/* We've just made a write to tlb_lo. */
	lo = env->sregs[SFR_RW_MM_TLB_LO];
	/* Writes are done via r_mm_cause. */
	hi = env->sregs[SFR_R_MM_CAUSE];

	vaddr = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].hi,
	13, 31);
	vaddr <<= TARGET_PAGE_BITS;
	tlb_v = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].lo,
	3, 3);
	env->tlbsets[srs - 1][set][idx].lo = lo;
	env->tlbsets[srs - 1][set][idx].hi = hi;

	D_LOG("tlb flush vaddr=%x v=%d pc=%x\n",
	vaddr, tlb_v, env->pc);
	if (tlb_v) {
	tlb_flush_page(env, vaddr);
	}
	}
	}
	#endif
	}

	void helper_movl_reg_sreg(CPUCRISState *env, uint32_t reg, uint32_t sreg)
	{
	uint32_t srs;
	env->pregs[PR_SRS] &= 3;
	srs = env->pregs[PR_SRS];

	#if !defined(CONFIG_USER_ONLY)
	if (srs == 1 \|\| srs == 2)
	{
	uint32_t set;
	uint32_t idx;
	uint32_t lo, hi;

	idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
	set >>= 4;
	set &= 3;
	idx &= 15;

	/* Update the mirror regs. */
	hi = env->tlbsets[srs - 1][set][idx].hi;
	lo = env->tlbsets[srs - 1][set][idx].lo;
	env->sregs[SFR_RW_MM_TLB_HI] = hi;
	env->sregs[SFR_RW_MM_TLB_LO] = lo;
	}
	#endif
	env->regs[reg] = env->sregs[srs][sreg];
	}

	static void cris_ccs_rshift(CPUCRISState *env)
	{
	uint32_t ccs;

	/* Apply the ccs shift. */
	ccs = env->pregs[PR_CCS];
	ccs = (ccs & 0xc0000000) \| ((ccs & 0x0fffffff) >> 10);
	if (ccs & U_FLAG)
	{
	/* Enter user mode. */
	env->ksp = env->regs[R_SP];
	env->regs[R_SP] = env->pregs[PR_USP];
	}

	env->pregs[PR_CCS] = ccs;
	}

	void helper_rfe(CPUCRISState *env)
	{
	int rflag = env->pregs[PR_CCS] & R_FLAG;

	D_LOG("rfe: erp=%x pid=%x ccs=%x btarget=%x\n",
	env->pregs[PR_ERP], env->pregs[PR_PID],
	env->pregs[PR_CCS],
	env->btarget);

	cris_ccs_rshift(env);

	/* RFE sets the P_FLAG only if the R_FLAG is not set. */
	if (!rflag)
	env->pregs[PR_CCS] \|= P_FLAG;
	}

	void helper_rfn(CPUCRISState *env)
	{
	int rflag = env->pregs[PR_CCS] & R_FLAG;

	D_LOG("rfn: erp=%x pid=%x ccs=%x btarget=%x\n",
	env->pregs[PR_ERP], env->pregs[PR_PID],
	env->pregs[PR_CCS],
	env->btarget);

	cris_ccs_rshift(env);

	/* Set the P_FLAG only if the R_FLAG is not set. */
	if (!rflag)
	env->pregs[PR_CCS] \|= P_FLAG;

	/* Always set the M flag. */
	env->pregs[PR_CCS] \|= M_FLAG_V32;
	}

	uint32_t helper_lz(uint32_t t0)
	{
	return clz32(t0);
	}

	uint32_t helper_btst(CPUCRISState *env, uint32_t t0, uint32_t t1, uint32_t ccs)
	{
	/* FIXME: clean this up. */

	/* des ref:
	The N flag is set according to the selected bit in the dest reg.
	The Z flag is set if the selected bit and all bits to the right are
	zero.
	The X flag is cleared.
	Other flags are left untouched.
	The destination reg is not affected.*/
	unsigned int fz, sbit, bset, mask, masked_t0;

	sbit = t1 & 31;
	bset = !!(t0 & (1 << sbit));
	mask = sbit == 31 ? -1 : (1 << (sbit + 1)) - 1;
	masked_t0 = t0 & mask;
	fz = !(masked_t0 \| bset);

	/* Clear the X, N and Z flags. */
	ccs = ccs & ~(X_FLAG \| N_FLAG \| Z_FLAG);
	if (env->pregs[PR_VR] < 32)
	ccs &= ~(V_FLAG \| C_FLAG);
	/* Set the N and Z flags accordingly. */
	ccs \|= (bset << 3) \| (fz << 2);
	return ccs;
	}

	static inline uint32_t evaluate_flags_writeback(CPUCRISState *env,
	uint32_t flags, uint32_t ccs)
	{
	unsigned int x, z, mask;

	/* Extended arithmetics, leave the z flag alone. */
	x = env->cc_x;
	mask = env->cc_mask \| X_FLAG;
	if (x) {
	z = flags & Z_FLAG;
	mask = mask & ~z;
	}
	flags &= mask;

	/* all insn clear the x-flag except setf or clrf. */
	ccs &= ~mask;
	ccs \|= flags;
	return ccs;
	}

	uint32_t helper_evaluate_flags_muls(CPUCRISState *env,
	uint32_t ccs, uint32_t res, uint32_t mof)
	{
	uint32_t flags = 0;
	int64_t tmp;
	int dneg;

	dneg = ((int32_t)res) < 0;

	tmp = mof;
	tmp <<= 32;
	tmp \|= res;
	if (tmp == 0)
	flags \|= Z_FLAG;
	else if (tmp < 0)
	flags \|= N_FLAG;
	if ((dneg && mof != -1)
	\|\| (!dneg && mof != 0))
	flags \|= V_FLAG;
	return evaluate_flags_writeback(env, flags, ccs);
	}

	uint32_t helper_evaluate_flags_mulu(CPUCRISState *env,
	uint32_t ccs, uint32_t res, uint32_t mof)
	{
	uint32_t flags = 0;
	uint64_t tmp;

	tmp = mof;
	tmp <<= 32;
	tmp \|= res;
	if (tmp == 0)
	flags \|= Z_FLAG;
	else if (tmp >> 63)
	flags \|= N_FLAG;
	if (mof)
	flags \|= V_FLAG;

	return evaluate_flags_writeback(env, flags, ccs);
	}

	uint32_t helper_evaluate_flags_mcp(CPUCRISState *env, uint32_t ccs,
	uint32_t src, uint32_t dst, uint32_t res)
	{
	uint32_t flags = 0;

	src = src & 0x80000000;
	dst = dst & 0x80000000;

	if ((res & 0x80000000L) != 0L)
	{
	flags \|= N_FLAG;
	if (!src && !dst)
	flags \|= V_FLAG;
	else if (src & dst)
	flags \|= R_FLAG;
	}
	else
	{
	if (res == 0L)
	flags \|= Z_FLAG;
	if (src & dst)
	flags \|= V_FLAG;
	if (dst \| src)
	flags \|= R_FLAG;
	}

	return evaluate_flags_writeback(env, flags, ccs);
	}

	uint32_t helper_evaluate_flags_alu_4(CPUCRISState *env, uint32_t ccs,
	uint32_t src, uint32_t dst, uint32_t res)
	{
	uint32_t flags = 0;

	src = src & 0x80000000;
	dst = dst & 0x80000000;

	if ((res & 0x80000000L) != 0L)
	{
	flags \|= N_FLAG;
	if (!src && !dst)
	flags \|= V_FLAG;
	else if (src & dst)
	flags \|= C_FLAG;
	}
	else
	{
	if (res == 0L)
	flags \|= Z_FLAG;
	if (src & dst)
	flags \|= V_FLAG;
	if (dst \| src)
	flags \|= C_FLAG;
	}

	return evaluate_flags_writeback(env, flags, ccs);
	}

	uint32_t helper_evaluate_flags_sub_4(CPUCRISState *env, uint32_t ccs,
	uint32_t src, uint32_t dst, uint32_t res)
	{
	uint32_t flags = 0;

	src = (~src) & 0x80000000;
	dst = dst & 0x80000000;

	if ((res & 0x80000000L) != 0L)
	{
	flags \|= N_FLAG;
	if (!src && !dst)
	flags \|= V_FLAG;
	else if (src & dst)
	flags \|= C_FLAG;
	}
	else
	{
	if (res == 0L)
	flags \|= Z_FLAG;
	if (src & dst)
	flags \|= V_FLAG;
	if (dst \| src)
	flags \|= C_FLAG;
	}

	flags ^= C_FLAG;
	return evaluate_flags_writeback(env, flags, ccs);
	}

	uint32_t helper_evaluate_flags_move_4(CPUCRISState *env,
	uint32_t ccs, uint32_t res)
	{
	uint32_t flags = 0;

	if ((int32_t)res < 0)
	flags \|= N_FLAG;
	else if (res == 0L)
	flags \|= Z_FLAG;

	return evaluate_flags_writeback(env, flags, ccs);
	}
	uint32_t helper_evaluate_flags_move_2(CPUCRISState *env,
	uint32_t ccs, uint32_t res)
	{
	uint32_t flags = 0;

	if ((int16_t)res < 0L)
	flags \|= N_FLAG;
	else if (res == 0)
	flags \|= Z_FLAG;

	return evaluate_flags_writeback(env, flags, ccs);
	}

	/* TODO: This is expensive. We could split things up and only evaluate part of
	CCR on a need to know basis. For now, we simply re-evaluate everything. */
	void helper_evaluate_flags(CPUCRISState *env)
	{
	uint32_t src, dst, res;
	uint32_t flags = 0;

	src = env->cc_src;
	dst = env->cc_dest;
	res = env->cc_result;

	if (env->cc_op == CC_OP_SUB \|\| env->cc_op == CC_OP_CMP)
	src = ~src;

	/* Now, evaluate the flags. This stuff is based on
	Per Zander's CRISv10 simulator. */
	switch (env->cc_size)
	{
	case 1:
	if ((res & 0x80L) != 0L)
	{
	flags \|= N_FLAG;
	if (((src & 0x80L) == 0L)
	&& ((dst & 0x80L) == 0L))
	{
	flags \|= V_FLAG;
	}
	else if (((src & 0x80L) != 0L)
	&& ((dst & 0x80L) != 0L))
	{
	flags \|= C_FLAG;
	}
	}
	else
	{
	if ((res & 0xFFL) == 0L)
	{
	flags \|= Z_FLAG;
	}
	if (((src & 0x80L) != 0L)
	&& ((dst & 0x80L) != 0L))
	{
	flags \|= V_FLAG;
	}
	if ((dst & 0x80L) != 0L
	\|\| (src & 0x80L) != 0L)
	{
	flags \|= C_FLAG;
	}
	}
	break;
	case 2:
	if ((res & 0x8000L) != 0L)
	{
	flags \|= N_FLAG;
	if (((src & 0x8000L) == 0L)
	&& ((dst & 0x8000L) == 0L))
	{
	flags \|= V_FLAG;
	}
	else if (((src & 0x8000L) != 0L)
	&& ((dst & 0x8000L) != 0L))
	{
	flags \|= C_FLAG;
	}
	}
	else
	{
	if ((res & 0xFFFFL) == 0L)
	{
	flags \|= Z_FLAG;
	}
	if (((src & 0x8000L) != 0L)
	&& ((dst & 0x8000L) != 0L))
	{
	flags \|= V_FLAG;
	}
	if ((dst & 0x8000L) != 0L
	\|\| (src & 0x8000L) != 0L)
	{
	flags \|= C_FLAG;
	}
	}
	break;
	case 4:
	if ((res & 0x80000000L) != 0L)
	{
	flags \|= N_FLAG;
	if (((src & 0x80000000L) == 0L)
	&& ((dst & 0x80000000L) == 0L))
	{
	flags \|= V_FLAG;
	}
	else if (((src & 0x80000000L) != 0L) &&
	((dst & 0x80000000L) != 0L))
	{
	flags \|= C_FLAG;
	}
	}
	else
	{
	if (res == 0L)
	flags \|= Z_FLAG;
	if (((src & 0x80000000L) != 0L)
	&& ((dst & 0x80000000L) != 0L))
	flags \|= V_FLAG;
	if ((dst & 0x80000000L) != 0L
	\|\| (src & 0x80000000L) != 0L)
	flags \|= C_FLAG;
	}
	break;
	default:
	break;
	}

	if (env->cc_op == CC_OP_SUB \|\| env->cc_op == CC_OP_CMP)
	flags ^= C_FLAG;

	env->pregs[PR_CCS] = evaluate_flags_writeback(env, flags,
	env->pregs[PR_CCS]);
	}

	void helper_top_evaluate_flags(CPUCRISState *env)
	{
	switch (env->cc_op)
	{
	case CC_OP_MCP:
	env->pregs[PR_CCS] = helper_evaluate_flags_mcp(env,
	env->pregs[PR_CCS], env->cc_src,
	env->cc_dest, env->cc_result);
	break;
	case CC_OP_MULS:
	env->pregs[PR_CCS] = helper_evaluate_flags_muls(env,
	env->pregs[PR_CCS], env->cc_result,
	env->pregs[PR_MOF]);
	break;
	case CC_OP_MULU:
	env->pregs[PR_CCS] = helper_evaluate_flags_mulu(env,
	env->pregs[PR_CCS], env->cc_result,
	env->pregs[PR_MOF]);
	break;
	case CC_OP_MOVE:
	case CC_OP_AND:
	case CC_OP_OR:
	case CC_OP_XOR:
	case CC_OP_ASR:
	case CC_OP_LSR:
	case CC_OP_LSL:
	switch (env->cc_size)
	{
	case 4:
	env->pregs[PR_CCS] =
	helper_evaluate_flags_move_4(env,
	env->pregs[PR_CCS],
	env->cc_result);
	break;
	case 2:
	env->pregs[PR_CCS] =
	helper_evaluate_flags_move_2(env,
	env->pregs[PR_CCS],
	env->cc_result);
	break;
	default:
	helper_evaluate_flags(env);
	break;
	}
	break;
	case CC_OP_FLAGS:
	/* live. */
	break;
	case CC_OP_SUB:
	case CC_OP_CMP:
	if (env->cc_size == 4)
	env->pregs[PR_CCS] =
	helper_evaluate_flags_sub_4(env,
	env->pregs[PR_CCS],
	env->cc_src, env->cc_dest,
	env->cc_result);
	else
	helper_evaluate_flags(env);
	break;
	default:
	{
	switch (env->cc_size)
	{
	case 4:
	env->pregs[PR_CCS] =
	helper_evaluate_flags_alu_4(env,
	env->pregs[PR_CCS],
	env->cc_src, env->cc_dest,
	env->cc_result);
	break;
	default:
	helper_evaluate_flags(env);
	break;
	}
	}
	break;
	}
	}