[qemu.git] / target-cris / op_helper.c

/*
 *  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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 USA
 */

#include <assert.h>
#include "exec.h"
#include "mmu.h"
#include "helper.h"

#define D(x)

#if !defined(CONFIG_USER_ONLY)

#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 (target_ulong addr, int is_write, int mmu_idx, void *retaddr)
{
    TranslationBlock *tb;
    CPUState *saved_env;
    unsigned long pc;
    int ret;

    /* XXX: hack to restore env in all cases, even if not called from
       generated code */
    saved_env = env;
    env = cpu_single_env;

    D(fprintf(logfile, "%s pc=%x tpc=%x ra=%x\n", __func__, 
	     env->pc, env->debug1, retaddr));
    ret = cpu_cris_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
    if (unlikely(ret)) {
        if (retaddr) {
            /* now we have a real cpu fault */
            pc = (unsigned long)retaddr;
            tb = tb_find_pc(pc);
            if (tb) {
                /* the PC is inside the translated code. It means that we have
                   a virtual CPU fault */
                cpu_restore_state(tb, env, pc, NULL);

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

#endif

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

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

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

	D(fprintf(logfile, "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(void)
{
	int rflag = env->pregs[PR_CCS] & R_FLAG;

	D(fprintf(logfile, "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;
}

static void evaluate_flags_writeback(uint32_t flags)
{
	int x;

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

	/* all insn clear the x-flag except setf or clrf.  */
	env->pregs[PR_CCS] &= ~(env->cc_mask | X_FLAG);
	flags &= env->cc_mask;
	env->pregs[PR_CCS] |= flags;
}

void helper_evaluate_flags_muls(void)
{
	uint32_t src;
	uint32_t dst;
	uint32_t res;
	uint32_t flags = 0;
	int64_t tmp;
	int32_t mof;
	int dneg;

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

	dneg = ((int32_t)res) < 0;

	mof = env->pregs[PR_MOF];
	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;
	evaluate_flags_writeback(flags);
}

void  helper_evaluate_flags_mulu(void)
{
	uint32_t src;
	uint32_t dst;
	uint32_t res;
	uint32_t flags = 0;
	uint64_t tmp;
	uint32_t mof;

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

	mof = env->pregs[PR_MOF];
	tmp = mof;
	tmp <<= 32;
	tmp |= res;
	if (tmp == 0)
		flags |= Z_FLAG;
	else if (tmp >> 63)
		flags |= N_FLAG;
	if (mof)
		flags |= V_FLAG;

	evaluate_flags_writeback(flags);
}

void  helper_evaluate_flags_mcp(void)
{
	uint32_t src;
	uint32_t dst;
	uint32_t res;
	uint32_t flags = 0;

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

	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 |= R_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 |= R_FLAG;
	}

	evaluate_flags_writeback(flags);
}

void  helper_evaluate_flags_alu_4(void)
{
	uint32_t src;
	uint32_t dst;
	uint32_t res;
	uint32_t flags = 0;

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

	/* Reconstruct the result.  */
	switch (env->cc_op)
	{
		case CC_OP_SUB:
			res = dst - src;
			break;
		case CC_OP_ADD:
			res = dst + src;
			break;
		default:
			res = env->cc_result;
			break;
	}

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

	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;
	}

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

void  helper_evaluate_flags_move_4 (void)
{
	uint32_t res;
	uint32_t flags = 0;

	res = env->cc_result;

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

	evaluate_flags_writeback(flags);
}
void  helper_evaluate_flags_move_2 (void)
{
	uint32_t src;
	uint32_t flags = 0;
	uint16_t res;

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

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

	evaluate_flags_writeback(flags);
}

/* 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 (void)
{
	uint32_t src;
	uint32_t dst;
	uint32_t 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;
	}
	evaluate_flags_writeback(flags);
}

void helper_top_evaluate_flags(void)
{
	switch (env->cc_op)
	{
		case CC_OP_MCP:
			helper_evaluate_flags_mcp();
			break;
		case CC_OP_MULS:
			helper_evaluate_flags_muls();
			break;
		case CC_OP_MULU:
			helper_evaluate_flags_mulu();
			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:
					helper_evaluate_flags_move_4();
					break;
				case 2:
					helper_evaluate_flags_move_2();
					break;
				default:
					helper_evaluate_flags();
					break;
			}
			break;
		case CC_OP_FLAGS:
			/* live.  */
			break;
		default:
		{
			switch (env->cc_size)
			{
				case 4:
					helper_evaluate_flags_alu_4();
					break;
				default:
					helper_evaluate_flags();
					break;
			}
		}
		break;
	}
}
Commit	Line	Data
81fdc5f8 TS	1	/*
	2	* CRIS helper routines
	3	*
	4	* Copyright (c) 2007 AXIS Communications
	5	* Written by Edgar E. Iglesias
	6	*
	7	* This library is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2 of the License, or (at your option) any later version.
	11	*
	12	* This library is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with this library; if not, write to the Free Software
fad6cb1a	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA
81fdc5f8 TS	20	*/
	21
	22	#include <assert.h>
	23	#include "exec.h"
786c02f1	24	#include "mmu.h"
30abcfc7	25	#include "helper.h"
81fdc5f8	26
e2eef170 PB	27	#define D(x)
	28
	29	#if !defined(CONFIG_USER_ONLY)
	30
81fdc5f8	31	#define MMUSUFFIX _mmu
81fdc5f8 TS	32
	33	#define SHIFT 0
	34	#include "softmmu_template.h"
	35
	36	#define SHIFT 1
	37	#include "softmmu_template.h"
	38
	39	#define SHIFT 2
	40	#include "softmmu_template.h"
	41
	42	#define SHIFT 3
	43	#include "softmmu_template.h"
	44
	45	/* Try to fill the TLB and return an exception if error. If retaddr is
	46	NULL, it means that the function was called in C code (i.e. not
	47	from generated code or from helper.c) */
	48	/* XXX: fix it to restore all registers */
6ebbf390	49	void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr)
81fdc5f8 TS	50	{
	51	TranslationBlock *tb;
	52	CPUState *saved_env;
44f8625d	53	unsigned long pc;
81fdc5f8 TS	54	int ret;
	55
	56	/* XXX: hack to restore env in all cases, even if not called from
	57	generated code */
	58	saved_env = env;
	59	env = cpu_single_env;
b41f7df0	60
ef29a70d EI	61	D(fprintf(logfile, "%s pc=%x tpc=%x ra=%x\n", __func__,
ef29a70d EI	62	env->pc, env->debug1, retaddr));
6ebbf390	63	ret = cpu_cris_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
551bd27f	64	if (unlikely(ret)) {
81fdc5f8 TS	65	if (retaddr) {
81fdc5f8 TS	66	/* now we have a real cpu fault */
44f8625d	67	pc = (unsigned long)retaddr;
81fdc5f8 TS	68	tb = tb_find_pc(pc);
	69	if (tb) {
	70	/* the PC is inside the translated code. It means that we have
	71	a virtual CPU fault */
	72	cpu_restore_state(tb, env, pc, NULL);
30abcfc7 EI	73
	74	/* Evaluate flags after retranslation. */
	75	helper_top_evaluate_flags();
81fdc5f8 TS	76	}
	77	}
	78	cpu_loop_exit();
	79	}
	80	env = saved_env;
	81	}
	82
e2eef170 PB	83	#endif
e2eef170 PB	84
dceaf394	85	void helper_raise_exception(uint32_t index)
786c02f1	86	{
dceaf394 EI	87	env->exception_index = index;
dceaf394 EI	88	cpu_loop_exit();
786c02f1 EI	89	}
786c02f1 EI	90
cf1d97f0 EI	91	void helper_tlb_flush_pid(uint32_t pid)
	92	{
	93	#if !defined(CONFIG_USER_ONLY)
28de16da EI	94	pid &= 0xff;
	95	if (pid != (env->pregs[PR_PID] & 0xff))
	96	cris_mmu_flush_pid(env, env->pregs[PR_PID]);
cf1d97f0 EI	97	#endif
	98	}
	99
a1aebcb8 EI	100	void helper_spc_write(uint32_t new_spc)
	101	{
	102	#if !defined(CONFIG_USER_ONLY)
	103	tlb_flush_page(env, env->pregs[PR_SPC]);
	104	tlb_flush_page(env, new_spc);
	105	#endif
	106	}
	107
30abcfc7	108	void helper_dump(uint32_t a0, uint32_t a1, uint32_t a2)
b41f7df0 EI	109	{
	110	(fprintf(logfile, "%s: a0=%x a1=%x\n", __func__, a0, a1));
	111	}
	112
cf1d97f0 EI	113	/* Used by the tlb decoder. */
	114	#define EXTRACT_FIELD(src, start, end) \
	115	(((src) >> start) & ((1 << (end - start + 1)) - 1))
	116
dceaf394 EI	117	void helper_movl_sreg_reg (uint32_t sreg, uint32_t reg)
	118	{
	119	uint32_t srs;
	120	srs = env->pregs[PR_SRS];
	121	srs &= 3;
	122	env->sregs[srs][sreg] = env->regs[reg];
	123
	124	#if !defined(CONFIG_USER_ONLY)
	125	if (srs == 1 \|\| srs == 2) {
	126	if (sreg == 6) {
	127	/* Writes to tlb-hi write to mm_cause as a side
	128	effect. */
6913ba56 EI	129	env->sregs[SFR_RW_MM_TLB_HI] = env->regs[reg];
6913ba56 EI	130	env->sregs[SFR_R_MM_CAUSE] = env->regs[reg];
dceaf394 EI	131	}
	132	else if (sreg == 5) {
	133	uint32_t set;
	134	uint32_t idx;
	135	uint32_t lo, hi;
	136	uint32_t vaddr;
cf1d97f0	137	int tlb_v;
dceaf394 EI	138
	139	idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
	140	set >>= 4;
	141	set &= 3;
	142
	143	idx &= 15;
	144	/* We've just made a write to tlb_lo. */
	145	lo = env->sregs[SFR_RW_MM_TLB_LO];
	146	/* Writes are done via r_mm_cause. */
	147	hi = env->sregs[SFR_R_MM_CAUSE];
cf1d97f0 EI	148
	149	vaddr = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].hi,
	150	13, 31);
	151	vaddr <<= TARGET_PAGE_BITS;
	152	tlb_v = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].lo,
	153	3, 3);
dceaf394 EI	154	env->tlbsets[srs - 1][set][idx].lo = lo;
dceaf394 EI	155	env->tlbsets[srs - 1][set][idx].hi = hi;
cf1d97f0 EI	156
	157	D(fprintf(logfile,
	158	"tlb flush vaddr=%x v=%d pc=%x\n",
	159	vaddr, tlb_v, env->pc));
	160	tlb_flush_page(env, vaddr);
dceaf394 EI	161	}
	162	}
	163	#endif
	164	}
	165
	166	void helper_movl_reg_sreg (uint32_t reg, uint32_t sreg)
	167	{
	168	uint32_t srs;
	169	env->pregs[PR_SRS] &= 3;
	170	srs = env->pregs[PR_SRS];
	171
	172	#if !defined(CONFIG_USER_ONLY)
	173	if (srs == 1 \|\| srs == 2)
	174	{
	175	uint32_t set;
	176	uint32_t idx;
	177	uint32_t lo, hi;
	178
	179	idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
	180	set >>= 4;
	181	set &= 3;
	182	idx &= 15;
	183
	184	/* Update the mirror regs. */
	185	hi = env->tlbsets[srs - 1][set][idx].hi;
	186	lo = env->tlbsets[srs - 1][set][idx].lo;
	187	env->sregs[SFR_RW_MM_TLB_HI] = hi;
	188	env->sregs[SFR_RW_MM_TLB_LO] = lo;
	189	}
	190	#endif
	191	env->regs[reg] = env->sregs[srs][sreg];
dceaf394 EI	192	}
	193
	194	static void cris_ccs_rshift(CPUState *env)
	195	{
	196	uint32_t ccs;
	197
	198	/* Apply the ccs shift. */
	199	ccs = env->pregs[PR_CCS];
	200	ccs = (ccs & 0xc0000000) \| ((ccs & 0x0fffffff) >> 10);
	201	if (ccs & U_FLAG)
	202	{
	203	/* Enter user mode. */
	204	env->ksp = env->regs[R_SP];
	205	env->regs[R_SP] = env->pregs[PR_USP];
	206	}
	207
	208	env->pregs[PR_CCS] = ccs;
	209	}
	210
b41f7df0 EI	211	void helper_rfe(void)
b41f7df0 EI	212	{
bf443337 EI	213	int rflag = env->pregs[PR_CCS] & R_FLAG;
bf443337 EI	214
b41f7df0 EI	215	D(fprintf(logfile, "rfe: erp=%x pid=%x ccs=%x btarget=%x\n",
	216	env->pregs[PR_ERP], env->pregs[PR_PID],
	217	env->pregs[PR_CCS],
	218	env->btarget));
dceaf394 EI	219
	220	cris_ccs_rshift(env);
	221
	222	/* RFE sets the P_FLAG only if the R_FLAG is not set. */
bf443337	223	if (!rflag)
dceaf394	224	env->pregs[PR_CCS] \|= P_FLAG;
b41f7df0 EI	225	}
b41f7df0 EI	226
5bf8f1ab EI	227	void helper_rfn(void)
	228	{
	229	int rflag = env->pregs[PR_CCS] & R_FLAG;
	230
	231	D(fprintf(logfile, "rfn: erp=%x pid=%x ccs=%x btarget=%x\n",
	232	env->pregs[PR_ERP], env->pregs[PR_PID],
	233	env->pregs[PR_CCS],
	234	env->btarget));
	235
	236	cris_ccs_rshift(env);
	237
	238	/* Set the P_FLAG only if the R_FLAG is not set. */
	239	if (!rflag)
	240	env->pregs[PR_CCS] \|= P_FLAG;
	241
	242	/* Always set the M flag. */
	243	env->pregs[PR_CCS] \|= M_FLAG;
	244	}
	245
b41f7df0 EI	246	static void evaluate_flags_writeback(uint32_t flags)
	247	{
	248	int x;
	249
	250	/* Extended arithmetics, leave the z flag alone. */
30abcfc7	251	x = env->cc_x;
b41f7df0 EI	252	if ((x \|\| env->cc_op == CC_OP_ADDC)
	253	&& flags & Z_FLAG)
	254	env->cc_mask &= ~Z_FLAG;
	255
	256	/* all insn clear the x-flag except setf or clrf. */
	257	env->pregs[PR_CCS] &= ~(env->cc_mask \| X_FLAG);
	258	flags &= env->cc_mask;
	259	env->pregs[PR_CCS] \|= flags;
b41f7df0 EI	260	}
	261
	262	void helper_evaluate_flags_muls(void)
	263	{
	264	uint32_t src;
	265	uint32_t dst;
	266	uint32_t res;
	267	uint32_t flags = 0;
dceaf394	268	int64_t tmp;
b41f7df0 EI	269	int32_t mof;
	270	int dneg;
	271
	272	src = env->cc_src;
	273	dst = env->cc_dest;
	274	res = env->cc_result;
	275
b41f7df0 EI	276	dneg = ((int32_t)res) < 0;
b41f7df0 EI	277
dceaf394 EI	278	mof = env->pregs[PR_MOF];
	279	tmp = mof;
	280	tmp <<= 32;
	281	tmp \|= res;
b41f7df0 EI	282	if (tmp == 0)
	283	flags \|= Z_FLAG;
	284	else if (tmp < 0)
	285	flags \|= N_FLAG;
	286	if ((dneg && mof != -1)
	287	\|\| (!dneg && mof != 0))
	288	flags \|= V_FLAG;
	289	evaluate_flags_writeback(flags);
	290	}
	291
	292	void helper_evaluate_flags_mulu(void)
	293	{
	294	uint32_t src;
	295	uint32_t dst;
	296	uint32_t res;
	297	uint32_t flags = 0;
dceaf394	298	uint64_t tmp;
b41f7df0 EI	299	uint32_t mof;
	300
	301	src = env->cc_src;
	302	dst = env->cc_dest;
	303	res = env->cc_result;
	304
dceaf394 EI	305	mof = env->pregs[PR_MOF];
	306	tmp = mof;
	307	tmp <<= 32;
	308	tmp \|= res;
b41f7df0 EI	309	if (tmp == 0)
	310	flags \|= Z_FLAG;
	311	else if (tmp >> 63)
	312	flags \|= N_FLAG;
	313	if (mof)
	314	flags \|= V_FLAG;
	315
	316	evaluate_flags_writeback(flags);
	317	}
	318
	319	void helper_evaluate_flags_mcp(void)
	320	{
	321	uint32_t src;
	322	uint32_t dst;
	323	uint32_t res;
	324	uint32_t flags = 0;
	325
	326	src = env->cc_src;
	327	dst = env->cc_dest;
	328	res = env->cc_result;
	329
	330	if ((res & 0x80000000L) != 0L)
	331	{
	332	flags \|= N_FLAG;
	333	if (((src & 0x80000000L) == 0L)
	334	&& ((dst & 0x80000000L) == 0L))
	335	{
	336	flags \|= V_FLAG;
	337	}
	338	else if (((src & 0x80000000L) != 0L) &&
	339	((dst & 0x80000000L) != 0L))
	340	{
	341	flags \|= R_FLAG;
	342	}
	343	}
	344	else
	345	{
	346	if (res == 0L)
	347	flags \|= Z_FLAG;
	348	if (((src & 0x80000000L) != 0L)
	349	&& ((dst & 0x80000000L) != 0L))
	350	flags \|= V_FLAG;
	351	if ((dst & 0x80000000L) != 0L
	352	\|\| (src & 0x80000000L) != 0L)
	353	flags \|= R_FLAG;
	354	}
	355
	356	evaluate_flags_writeback(flags);
	357	}
	358
	359	void helper_evaluate_flags_alu_4(void)
	360	{
	361	uint32_t src;
	362	uint32_t dst;
	363	uint32_t res;
	364	uint32_t flags = 0;
	365
	366	src = env->cc_src;
	367	dst = env->cc_dest;
30abcfc7 EI	368
	369	/* Reconstruct the result. */
	370	switch (env->cc_op)
	371	{
	372	case CC_OP_SUB:
	373	res = dst - src;
	374	break;
	375	case CC_OP_ADD:
	376	res = dst + src;
	377	break;
	378	default:
	379	res = env->cc_result;
	380	break;
	381	}
	382
	383	if (env->cc_op == CC_OP_SUB \|\| env->cc_op == CC_OP_CMP)
	384	src = ~src;
b41f7df0 EI	385
	386	if ((res & 0x80000000L) != 0L)
	387	{
	388	flags \|= N_FLAG;
	389	if (((src & 0x80000000L) == 0L)
	390	&& ((dst & 0x80000000L) == 0L))
	391	{
	392	flags \|= V_FLAG;
	393	}
	394	else if (((src & 0x80000000L) != 0L) &&
	395	((dst & 0x80000000L) != 0L))
	396	{
	397	flags \|= C_FLAG;
	398	}
	399	}
	400	else
	401	{
	402	if (res == 0L)
	403	flags \|= Z_FLAG;
	404	if (((src & 0x80000000L) != 0L)
	405	&& ((dst & 0x80000000L) != 0L))
	406	flags \|= V_FLAG;
	407	if ((dst & 0x80000000L) != 0L
	408	\|\| (src & 0x80000000L) != 0L)
	409	flags \|= C_FLAG;
	410	}
	411
	412	if (env->cc_op == CC_OP_SUB
	413	\|\| env->cc_op == CC_OP_CMP) {
	414	flags ^= C_FLAG;
	415	}
	416	evaluate_flags_writeback(flags);
	417	}
	418
	419	void helper_evaluate_flags_move_4 (void)
	420	{
b41f7df0 EI	421	uint32_t res;
	422	uint32_t flags = 0;
	423
b41f7df0 EI	424	res = env->cc_result;
	425
	426	if ((int32_t)res < 0)
	427	flags \|= N_FLAG;
	428	else if (res == 0L)
	429	flags \|= Z_FLAG;
	430
	431	evaluate_flags_writeback(flags);
	432	}
	433	void helper_evaluate_flags_move_2 (void)
	434	{
	435	uint32_t src;
	436	uint32_t flags = 0;
	437	uint16_t res;
	438
	439	src = env->cc_src;
	440	res = env->cc_result;
	441
	442	if ((int16_t)res < 0L)
	443	flags \|= N_FLAG;
	444	else if (res == 0)
	445	flags \|= Z_FLAG;
	446
	447	evaluate_flags_writeback(flags);
	448	}
	449
	450	/* TODO: This is expensive. We could split things up and only evaluate part of
	451	CCR on a need to know basis. For now, we simply re-evaluate everything. */
	452	void helper_evaluate_flags (void)
	453	{
	454	uint32_t src;
	455	uint32_t dst;
	456	uint32_t res;
	457	uint32_t flags = 0;
	458
	459	src = env->cc_src;
	460	dst = env->cc_dest;
	461	res = env->cc_result;
	462
30abcfc7 EI	463	if (env->cc_op == CC_OP_SUB \|\| env->cc_op == CC_OP_CMP)
30abcfc7 EI	464	src = ~src;
b41f7df0 EI	465
	466	/* Now, evaluate the flags. This stuff is based on
	467	Per Zander's CRISv10 simulator. */
	468	switch (env->cc_size)
	469	{
	470	case 1:
	471	if ((res & 0x80L) != 0L)
	472	{
	473	flags \|= N_FLAG;
	474	if (((src & 0x80L) == 0L)
	475	&& ((dst & 0x80L) == 0L))
	476	{
	477	flags \|= V_FLAG;
	478	}
	479	else if (((src & 0x80L) != 0L)
	480	&& ((dst & 0x80L) != 0L))
	481	{
	482	flags \|= C_FLAG;
	483	}
	484	}
	485	else
	486	{
	487	if ((res & 0xFFL) == 0L)
	488	{
	489	flags \|= Z_FLAG;
	490	}
	491	if (((src & 0x80L) != 0L)
	492	&& ((dst & 0x80L) != 0L))
	493	{
	494	flags \|= V_FLAG;
	495	}
	496	if ((dst & 0x80L) != 0L
	497	\|\| (src & 0x80L) != 0L)
	498	{
	499	flags \|= C_FLAG;
	500	}
	501	}
	502	break;
	503	case 2:
	504	if ((res & 0x8000L) != 0L)
	505	{
	506	flags \|= N_FLAG;
	507	if (((src & 0x8000L) == 0L)
	508	&& ((dst & 0x8000L) == 0L))
	509	{
	510	flags \|= V_FLAG;
	511	}
	512	else if (((src & 0x8000L) != 0L)
	513	&& ((dst & 0x8000L) != 0L))
	514	{
	515	flags \|= C_FLAG;
	516	}
	517	}
	518	else
	519	{
	520	if ((res & 0xFFFFL) == 0L)
	521	{
	522	flags \|= Z_FLAG;
	523	}
	524	if (((src & 0x8000L) != 0L)
	525	&& ((dst & 0x8000L) != 0L))
	526	{
	527	flags \|= V_FLAG;
	528	}
529	if ((dst & 0x8000L) != 0L
530	\|\| (src & 0x8000L) != 0L)
531	{
532	flags \|= C_FLAG;
533	}
534	}
535	break;
536	case 4:
537	if ((res & 0x80000000L) != 0L)
538	{
539	flags \|= N_FLAG;
540	if (((src & 0x80000000L) == 0L)
541	&& ((dst & 0x80000000L) == 0L))
542	{
543	flags \|= V_FLAG;
544	}
545	else if (((src & 0x80000000L) != 0L) &&
546	((dst & 0x80000000L) != 0L))
547	{
548	flags \|= C_FLAG;
549	}
550	}
551	else
552	{
553	if (res == 0L)
554	flags \|= Z_FLAG;
555	if (((src & 0x80000000L) != 0L)
556	&& ((dst & 0x80000000L) != 0L))
557	flags \|= V_FLAG;
558	if ((dst & 0x80000000L) != 0L
559	\|\| (src & 0x80000000L) != 0L)
560	flags \|= C_FLAG;
561	}
562	break;
563	default:
564	break;
565	}
566
567	if (env->cc_op == CC_OP_SUB
568	\|\| env->cc_op == CC_OP_CMP) {
569	flags ^= C_FLAG;
570	}
571	evaluate_flags_writeback(flags);
572	}
30abcfc7 EI	573
	574	void helper_top_evaluate_flags(void)
	575	{
	576	switch (env->cc_op)
	577	{
	578	case CC_OP_MCP:
	579	helper_evaluate_flags_mcp();
	580	break;
	581	case CC_OP_MULS:
	582	helper_evaluate_flags_muls();
	583	break;
	584	case CC_OP_MULU:
	585	helper_evaluate_flags_mulu();
	586	break;
	587	case CC_OP_MOVE:
	588	case CC_OP_AND:
	589	case CC_OP_OR:
	590	case CC_OP_XOR:
	591	case CC_OP_ASR:
	592	case CC_OP_LSR:
	593	case CC_OP_LSL:
	594	switch (env->cc_size)
	595	{
	596	case 4:
	597	helper_evaluate_flags_move_4();
	598	break;
	599	case 2:
	600	helper_evaluate_flags_move_2();
	601	break;
	602	default:
	603	helper_evaluate_flags();
	604	break;
	605	}
	606	break;
	607	case CC_OP_FLAGS:
	608	/* live. */
	609	break;
	610	default:
	611	{
	612	switch (env->cc_size)
	613	{
	614	case 4:
	615	helper_evaluate_flags_alu_4();
	616	break;
	617	default:
	618	helper_evaluate_flags();
	619	break;
	620	}
	621	}
	622	break;
	623	}
	624	}