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

/*
 *  Microblaze helper routines.
 *
 *  Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>.
 *
 * 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 <assert.h>
#include "exec.h"
#include "helper.h"
#include "host-utils.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;

    ret = cpu_mb_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);
            }
        }
        cpu_loop_exit();
    }
    env = saved_env;
}
#endif

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

void helper_debug(void)
{
    int i;

    qemu_log("PC=%8.8x\n", env->sregs[SR_PC]);
    qemu_log("rmsr=%x resr=%x rear=%x debug[%x] imm=%x iflags=%x\n",
             env->sregs[SR_MSR], env->sregs[SR_ESR], env->sregs[SR_EAR],
             env->debug, env->imm, env->iflags);
    qemu_log("btaken=%d btarget=%x mode=%s(saved=%s) eip=%d ie=%d\n",
             env->btaken, env->btarget,
             (env->sregs[SR_MSR] & MSR_UM) ? "user" : "kernel",
             (env->sregs[SR_MSR] & MSR_UMS) ? "user" : "kernel",
             (env->sregs[SR_MSR] & MSR_EIP),
             (env->sregs[SR_MSR] & MSR_IE));
    for (i = 0; i < 32; i++) {
        qemu_log("r%2.2d=%8.8x ", i, env->regs[i]);
        if ((i + 1) % 4 == 0)
            qemu_log("\n");
    }
    qemu_log("\n\n");
}

static inline uint32_t compute_carry(uint32_t a, uint32_t b, uint32_t cin)
{
    uint32_t cout = 0;

    if ((b == ~0) && cin)
        cout = 1;
    else if ((~0 - a) < (b + cin))
        cout = 1;
    return cout;
}

uint32_t helper_cmp(uint32_t a, uint32_t b)
{
    uint32_t t;

    t = b + ~a + 1;
    if ((b & 0x80000000) ^ (a & 0x80000000))
        t = (t & 0x7fffffff) | (b & 0x80000000);
    return t;
}

uint32_t helper_cmpu(uint32_t a, uint32_t b)
{
    uint32_t t;

    t = b + ~a + 1;
    if ((b & 0x80000000) ^ (a & 0x80000000))
        t = (t & 0x7fffffff) | (a & 0x80000000);
    return t;
}

uint32_t helper_addkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c)
{
    uint32_t d, cf = 0, ncf;

    if (c)
        cf = env->sregs[SR_MSR] >> 31;
    assert(cf == 0 || cf == 1);
    d = a + b + cf;

    if (!k) {
        ncf = compute_carry(a, b, cf);
        assert(ncf == 0 || ncf == 1);
        if (ncf)
            env->sregs[SR_MSR] |= MSR_C | MSR_CC;
        else
            env->sregs[SR_MSR] &= ~(MSR_C | MSR_CC);
    }
    D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n",
               d, a, b, cf, ncf, k, c));
    return d;
}

uint32_t helper_subkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c)
{
    uint32_t d, cf = 1, ncf;

    if (c)
        cf = env->sregs[SR_MSR] >> 31; 
    assert(cf == 0 || cf == 1);
    d = b + ~a + cf;

    if (!k) {
        ncf = compute_carry(b, ~a, cf);
        assert(ncf == 0 || ncf == 1);
        if (ncf)
            env->sregs[SR_MSR] |= MSR_C | MSR_CC;
        else
            env->sregs[SR_MSR] &= ~(MSR_C | MSR_CC);
    }
    D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n",
               d, a, b, cf, ncf, k, c));
    return d;
}

static inline int div_prepare(uint32_t a, uint32_t b)
{
    if (b == 0) {
        env->sregs[SR_MSR] |= MSR_DZ;

        if ((env->sregs[SR_MSR] & MSR_EE)
            && !(env->pvr.regs[2] & PVR2_DIV_ZERO_EXC_MASK)) {
            env->sregs[SR_ESR] = ESR_EC_DIVZERO;
            helper_raise_exception(EXCP_HW_EXCP);
        }
        return 0;
    }
    env->sregs[SR_MSR] &= ~MSR_DZ;
    return 1;
}

uint32_t helper_divs(uint32_t a, uint32_t b)
{
    if (!div_prepare(a, b))
        return 0;
    return (int32_t)a / (int32_t)b;
}

uint32_t helper_divu(uint32_t a, uint32_t b)
{
    if (!div_prepare(a, b))
        return 0;
    return a / b;
}

uint32_t helper_pcmpbf(uint32_t a, uint32_t b)
{
    unsigned int i;
    uint32_t mask = 0xff000000;

    for (i = 0; i < 4; i++) {
        if ((a & mask) == (b & mask))
            return i + 1;
        mask >>= 8;
    }
    return 0;
}

void helper_memalign(uint32_t addr, uint32_t dr, uint32_t wr, uint32_t mask)
{
    if (addr & mask) {
            qemu_log_mask(CPU_LOG_INT,
                          "unaligned access addr=%x mask=%x, wr=%d dr=r%d\n",
                          addr, mask, wr, dr);
            env->sregs[SR_EAR] = addr;
            env->sregs[SR_ESR] = ESR_EC_UNALIGNED_DATA | (wr << 10) \
                                 | (dr & 31) << 5;
            if (mask == 3) {
                env->sregs[SR_ESR] |= 1 << 11;
            }
            if (!(env->sregs[SR_MSR] & MSR_EE)) {
                return;
            }
            helper_raise_exception(EXCP_HW_EXCP);
    }
}

#if !defined(CONFIG_USER_ONLY)
/* Writes/reads to the MMU's special regs end up here.  */
uint32_t helper_mmu_read(uint32_t rn)
{
    return mmu_read(env, rn);
}

void helper_mmu_write(uint32_t rn, uint32_t v)
{
    mmu_write(env, rn, v);
}

void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,
                          int is_asi, int size)
{
    CPUState *saved_env;

    if (!cpu_single_env) {
        /* XXX: ???   */
        return;
    }

    /* XXX: hack to restore env in all cases, even if not called from
       generated code */
    saved_env = env;
    env = cpu_single_env;
    qemu_log_mask(CPU_LOG_INT, "Unassigned " TARGET_FMT_plx " wr=%d exe=%d\n",
             addr, is_write, is_exec);
    if (!(env->sregs[SR_MSR] & MSR_EE)) {
        env = saved_env;
        return;
    }

    env->sregs[SR_EAR] = addr;
    if (is_exec) {
        if ((env->pvr.regs[2] & PVR2_IOPB_BUS_EXC_MASK)) {
            env->sregs[SR_ESR] = ESR_EC_INSN_BUS;
            helper_raise_exception(EXCP_HW_EXCP);
        }
    } else {
        if ((env->pvr.regs[2] & PVR2_DOPB_BUS_EXC_MASK)) {
            env->sregs[SR_ESR] = ESR_EC_DATA_BUS;
            helper_raise_exception(EXCP_HW_EXCP);
        }
    }
    env = saved_env;
}
#endif
Commit	Line	Data
4acb54ba EI	1	/*
	2	* Microblaze helper routines.
	3	*
	4	* Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>.
	5	*
	6	* This library is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2 of the License, or (at your option) any later version.
	10	*
	11	* This library is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
8167ee88	17	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
4acb54ba EI	18	*/
	19
	20	#include <assert.h>
	21	#include "exec.h"
	22	#include "helper.h"
	23	#include "host-utils.h"
	24
	25	#define D(x)
	26
	27	#if !defined(CONFIG_USER_ONLY)
	28	#define MMUSUFFIX _mmu
	29	#define SHIFT 0
	30	#include "softmmu_template.h"
	31	#define SHIFT 1
	32	#include "softmmu_template.h"
	33	#define SHIFT 2
	34	#include "softmmu_template.h"
	35	#define SHIFT 3
	36	#include "softmmu_template.h"
	37
	38	/* Try to fill the TLB and return an exception if error. If retaddr is
	39	NULL, it means that the function was called in C code (i.e. not
	40	from generated code or from helper.c) */
	41	/* XXX: fix it to restore all registers */
	42	void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr)
	43	{
	44	TranslationBlock *tb;
	45	CPUState *saved_env;
	46	unsigned long pc;
	47	int ret;
	48
	49	/* XXX: hack to restore env in all cases, even if not called from
	50	generated code */
	51	saved_env = env;
	52	env = cpu_single_env;
	53
	54	ret = cpu_mb_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
	55	if (unlikely(ret)) {
	56	if (retaddr) {
	57	/* now we have a real cpu fault */
	58	pc = (unsigned long)retaddr;
	59	tb = tb_find_pc(pc);
	60	if (tb) {
	61	/* the PC is inside the translated code. It means that we have
	62	a virtual CPU fault */
	63	cpu_restore_state(tb, env, pc, NULL);
	64	}
	65	}
	66	cpu_loop_exit();
	67	}
	68	env = saved_env;
	69	}
	70	#endif
	71
	72	void helper_raise_exception(uint32_t index)
	73	{
	74	env->exception_index = index;
	75	cpu_loop_exit();
	76	}
	77
	78	void helper_debug(void)
	79	{
	80	int i;
	81
82	qemu_log("PC=%8.8x\n", env->sregs[SR_PC]);
4c24aa0a MS	83	qemu_log("rmsr=%x resr=%x rear=%x debug[%x] imm=%x iflags=%x\n",
4c24aa0a MS	84	env->sregs[SR_MSR], env->sregs[SR_ESR], env->sregs[SR_EAR],
17c52a43 EI	85	env->debug, env->imm, env->iflags);
	86	qemu_log("btaken=%d btarget=%x mode=%s(saved=%s) eip=%d ie=%d\n",
	87	env->btaken, env->btarget,
	88	(env->sregs[SR_MSR] & MSR_UM) ? "user" : "kernel",
	89	(env->sregs[SR_MSR] & MSR_UMS) ? "user" : "kernel",
	90	(env->sregs[SR_MSR] & MSR_EIP),
	91	(env->sregs[SR_MSR] & MSR_IE));
4acb54ba EI	92	for (i = 0; i < 32; i++) {
	93	qemu_log("r%2.2d=%8.8x ", i, env->regs[i]);
	94	if ((i + 1) % 4 == 0)
	95	qemu_log("\n");
	96	}
	97	qemu_log("\n\n");
	98	}
	99
	100	static inline uint32_t compute_carry(uint32_t a, uint32_t b, uint32_t cin)
	101	{
	102	uint32_t cout = 0;
	103
	104	if ((b == ~0) && cin)
	105	cout = 1;
	106	else if ((~0 - a) < (b + cin))
	107	cout = 1;
	108	return cout;
	109	}
	110
	111	uint32_t helper_cmp(uint32_t a, uint32_t b)
	112	{
	113	uint32_t t;
	114
	115	t = b + ~a + 1;
	116	if ((b & 0x80000000) ^ (a & 0x80000000))
	117	t = (t & 0x7fffffff) \| (b & 0x80000000);
	118	return t;
	119	}
	120
	121	uint32_t helper_cmpu(uint32_t a, uint32_t b)
	122	{
	123	uint32_t t;
	124
	125	t = b + ~a + 1;
	126	if ((b & 0x80000000) ^ (a & 0x80000000))
	127	t = (t & 0x7fffffff) \| (a & 0x80000000);
	128	return t;
	129	}
	130
	131	uint32_t helper_addkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c)
	132	{
	133	uint32_t d, cf = 0, ncf;
	134
	135	if (c)
	136	cf = env->sregs[SR_MSR] >> 31;
	137	assert(cf == 0 \|\| cf == 1);
	138	d = a + b + cf;
	139
	140	if (!k) {
	141	ncf = compute_carry(a, b, cf);
	142	assert(ncf == 0 \|\| ncf == 1);
	143	if (ncf)
	144	env->sregs[SR_MSR] \|= MSR_C \| MSR_CC;
	145	else
	146	env->sregs[SR_MSR] &= ~(MSR_C \| MSR_CC);
	147	}
	148	D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n",
	149	d, a, b, cf, ncf, k, c));
	150	return d;
	151	}
	152
	153	uint32_t helper_subkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c)
	154	{
	155	uint32_t d, cf = 1, ncf;
156
157	if (c)
158	cf = env->sregs[SR_MSR] >> 31;
159	assert(cf == 0 \|\| cf == 1);
160	d = b + ~a + cf;
161
162	if (!k) {
163	ncf = compute_carry(b, ~a, cf);
164	assert(ncf == 0 \|\| ncf == 1);
165	if (ncf)
166	env->sregs[SR_MSR] \|= MSR_C \| MSR_CC;
167	else
168	env->sregs[SR_MSR] &= ~(MSR_C \| MSR_CC);
169	}
170	D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n",
171	d, a, b, cf, ncf, k, c));
172	return d;
173	}
174
175	static inline int div_prepare(uint32_t a, uint32_t b)
176	{
177	if (b == 0) {
178	env->sregs[SR_MSR] \|= MSR_DZ;
821ebb33 EI	179
	180	if ((env->sregs[SR_MSR] & MSR_EE)
	181	&& !(env->pvr.regs[2] & PVR2_DIV_ZERO_EXC_MASK)) {
	182	env->sregs[SR_ESR] = ESR_EC_DIVZERO;
	183	helper_raise_exception(EXCP_HW_EXCP);
	184	}
4acb54ba EI	185	return 0;
	186	}
	187	env->sregs[SR_MSR] &= ~MSR_DZ;
	188	return 1;
	189	}
	190
	191	uint32_t helper_divs(uint32_t a, uint32_t b)
	192	{
	193	if (!div_prepare(a, b))
	194	return 0;
	195	return (int32_t)a / (int32_t)b;
	196	}
	197
	198	uint32_t helper_divu(uint32_t a, uint32_t b)
	199	{
	200	if (!div_prepare(a, b))
	201	return 0;
	202	return a / b;
	203	}
	204
	205	uint32_t helper_pcmpbf(uint32_t a, uint32_t b)
	206	{
	207	unsigned int i;
	208	uint32_t mask = 0xff000000;
	209
	210	for (i = 0; i < 4; i++) {
	211	if ((a & mask) == (b & mask))
	212	return i + 1;
	213	mask >>= 8;
	214	}
	215	return 0;
	216	}
	217
3aa80988	218	void helper_memalign(uint32_t addr, uint32_t dr, uint32_t wr, uint32_t mask)
968a40f6	219	{
968a40f6	220	if (addr & mask) {
97f90cbf EI	221	qemu_log_mask(CPU_LOG_INT,
	222	"unaligned access addr=%x mask=%x, wr=%d dr=r%d\n",
	223	addr, mask, wr, dr);
	224	env->sregs[SR_EAR] = addr;
968a40f6 EI	225	env->sregs[SR_ESR] = ESR_EC_UNALIGNED_DATA \| (wr << 10) \
968a40f6 EI	226	\| (dr & 31) << 5;
3aa80988	227	if (mask == 3) {
968a40f6 EI	228	env->sregs[SR_ESR] \|= 1 << 11;
968a40f6 EI	229	}
97f90cbf EI	230	if (!(env->sregs[SR_MSR] & MSR_EE)) {
	231	return;
	232	}
968a40f6 EI	233	helper_raise_exception(EXCP_HW_EXCP);
	234	}
	235	}
	236
4acb54ba EI	237	#if !defined(CONFIG_USER_ONLY)
	238	/* Writes/reads to the MMU's special regs end up here. */
	239	uint32_t helper_mmu_read(uint32_t rn)
	240	{
	241	return mmu_read(env, rn);
	242	}
	243
	244	void helper_mmu_write(uint32_t rn, uint32_t v)
	245	{
	246	mmu_write(env, rn, v);
	247	}
faed1c2a	248
c227f099	249	void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,
faed1c2a EI	250	int is_asi, int size)
	251	{
	252	CPUState *saved_env;
e1aa3254 EI	253
	254	if (!cpu_single_env) {
	255	/* XXX: ??? */
	256	return;
	257	}
	258
faed1c2a EI	259	/* XXX: hack to restore env in all cases, even if not called from
	260	generated code */
	261	saved_env = env;
	262	env = cpu_single_env;
97f90cbf	263	qemu_log_mask(CPU_LOG_INT, "Unassigned " TARGET_FMT_plx " wr=%d exe=%d\n",
faed1c2a EI	264	addr, is_write, is_exec);
faed1c2a EI	265	if (!(env->sregs[SR_MSR] & MSR_EE)) {
95b279de	266	env = saved_env;
faed1c2a EI	267	return;
	268	}
	269
97f90cbf	270	env->sregs[SR_EAR] = addr;
faed1c2a	271	if (is_exec) {
97f90cbf	272	if ((env->pvr.regs[2] & PVR2_IOPB_BUS_EXC_MASK)) {
faed1c2a EI	273	env->sregs[SR_ESR] = ESR_EC_INSN_BUS;
	274	helper_raise_exception(EXCP_HW_EXCP);
	275	}
	276	} else {
97f90cbf	277	if ((env->pvr.regs[2] & PVR2_DOPB_BUS_EXC_MASK)) {
faed1c2a EI	278	env->sregs[SR_ESR] = ESR_EC_DATA_BUS;
	279	helper_raise_exception(EXCP_HW_EXCP);
	280	}
	281	}
95b279de	282	env = saved_env;
faed1c2a	283	}
3c7b48b7	284	#endif