[mirror_qemu.git] / target-unicore32 / softmmu.c

/*
 * Softmmu related functions
 *
 * Copyright (C) 2010-2012 Guan Xuetao
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation, or any later version.
 * See the COPYING file in the top-level directory.
 */
#ifdef CONFIG_USER_ONLY
#error This file only exist under softmmu circumstance
#endif

#include <cpu.h>

#undef DEBUG_UC32

#ifdef DEBUG_UC32
#define DPRINTF(fmt, ...) printf("%s: " fmt , __func__, ## __VA_ARGS__)
#else
#define DPRINTF(fmt, ...) do {} while (0)
#endif

#define SUPERPAGE_SIZE             (1 << 22)
#define UC32_PAGETABLE_READ        (1 << 8)
#define UC32_PAGETABLE_WRITE       (1 << 7)
#define UC32_PAGETABLE_EXEC        (1 << 6)
#define UC32_PAGETABLE_EXIST       (1 << 2)
#define PAGETABLE_TYPE(x)          ((x) & 3)


/* Map CPU modes onto saved register banks.  */
static inline int bank_number(CPUUniCore32State *env, int mode)
{
    UniCore32CPU *cpu = uc32_env_get_cpu(env);

    switch (mode) {
    case ASR_MODE_USER:
    case ASR_MODE_SUSR:
        return 0;
    case ASR_MODE_PRIV:
        return 1;
    case ASR_MODE_TRAP:
        return 2;
    case ASR_MODE_EXTN:
        return 3;
    case ASR_MODE_INTR:
        return 4;
    }
    cpu_abort(CPU(cpu), "Bad mode %x\n", mode);
    return -1;
}

void switch_mode(CPUUniCore32State *env, int mode)
{
    int old_mode;
    int i;

    old_mode = env->uncached_asr & ASR_M;
    if (mode == old_mode) {
        return;
    }

    i = bank_number(env, old_mode);
    env->banked_r29[i] = env->regs[29];
    env->banked_r30[i] = env->regs[30];
    env->banked_bsr[i] = env->bsr;

    i = bank_number(env, mode);
    env->regs[29] = env->banked_r29[i];
    env->regs[30] = env->banked_r30[i];
    env->bsr = env->banked_bsr[i];
}

/* Handle a CPU exception.  */
void uc32_cpu_do_interrupt(CPUState *cs)
{
    UniCore32CPU *cpu = UNICORE32_CPU(cs);
    CPUUniCore32State *env = &cpu->env;
    uint32_t addr;
    int new_mode;

    switch (cs->exception_index) {
    case UC32_EXCP_PRIV:
        new_mode = ASR_MODE_PRIV;
        addr = 0x08;
        break;
    case UC32_EXCP_ITRAP:
        DPRINTF("itrap happened at %x\n", env->regs[31]);
        new_mode = ASR_MODE_TRAP;
        addr = 0x0c;
        break;
    case UC32_EXCP_DTRAP:
        DPRINTF("dtrap happened at %x\n", env->regs[31]);
        new_mode = ASR_MODE_TRAP;
        addr = 0x10;
        break;
    case UC32_EXCP_INTR:
        new_mode = ASR_MODE_INTR;
        addr = 0x18;
        break;
    default:
        cpu_abort(cs, "Unhandled exception 0x%x\n", cs->exception_index);
        return;
    }
    /* High vectors.  */
    if (env->cp0.c1_sys & (1 << 13)) {
        addr += 0xffff0000;
    }

    switch_mode(env, new_mode);
    env->bsr = cpu_asr_read(env);
    env->uncached_asr = (env->uncached_asr & ~ASR_M) | new_mode;
    env->uncached_asr |= ASR_I;
    /* The PC already points to the proper instruction.  */
    env->regs[30] = env->regs[31];
    env->regs[31] = addr;
    cs->interrupt_request |= CPU_INTERRUPT_EXITTB;
}

static int get_phys_addr_ucv2(CPUUniCore32State *env, uint32_t address,
        int access_type, int is_user, uint32_t *phys_ptr, int *prot,
        target_ulong *page_size)
{
    UniCore32CPU *cpu = uc32_env_get_cpu(env);
    CPUState *cs = CPU(cpu);
    int code;
    uint32_t table;
    uint32_t desc;
    uint32_t phys_addr;

    /* Pagetable walk.  */
    /* Lookup l1 descriptor.  */
    table = env->cp0.c2_base & 0xfffff000;
    table |= (address >> 20) & 0xffc;
    desc = ldl_phys(cs->as, table);
    code = 0;
    switch (PAGETABLE_TYPE(desc)) {
    case 3:
        /* Superpage  */
        if (!(desc & UC32_PAGETABLE_EXIST)) {
            code = 0x0b; /* superpage miss */
            goto do_fault;
        }
        phys_addr = (desc & 0xffc00000) | (address & 0x003fffff);
        *page_size = SUPERPAGE_SIZE;
        break;
    case 0:
        /* Lookup l2 entry.  */
        if (is_user) {
            DPRINTF("PGD address %x, desc %x\n", table, desc);
        }
        if (!(desc & UC32_PAGETABLE_EXIST)) {
            code = 0x05; /* second pagetable miss */
            goto do_fault;
        }
        table = (desc & 0xfffff000) | ((address >> 10) & 0xffc);
        desc = ldl_phys(cs->as, table);
        /* 4k page.  */
        if (is_user) {
            DPRINTF("PTE address %x, desc %x\n", table, desc);
        }
        if (!(desc & UC32_PAGETABLE_EXIST)) {
            code = 0x08; /* page miss */
            goto do_fault;
        }
        switch (PAGETABLE_TYPE(desc)) {
        case 0:
            phys_addr = (desc & 0xfffff000) | (address & 0xfff);
            *page_size = TARGET_PAGE_SIZE;
            break;
        default:
            cpu_abort(CPU(cpu), "wrong page type!");
        }
        break;
    default:
        cpu_abort(CPU(cpu), "wrong page type!");
    }

    *phys_ptr = phys_addr;
    *prot = 0;
    /* Check access permissions.  */
    if (desc & UC32_PAGETABLE_READ) {
        *prot |= PAGE_READ;
    } else {
        if (is_user && (access_type == 0)) {
            code = 0x11; /* access unreadable area */
            goto do_fault;
        }
    }

    if (desc & UC32_PAGETABLE_WRITE) {
        *prot |= PAGE_WRITE;
    } else {
        if (is_user && (access_type == 1)) {
            code = 0x12; /* access unwritable area */
            goto do_fault;
        }
    }

    if (desc & UC32_PAGETABLE_EXEC) {
        *prot |= PAGE_EXEC;
    } else {
        if (is_user && (access_type == 2)) {
            code = 0x13; /* access unexecutable area */
            goto do_fault;
        }
    }

do_fault:
    return code;
}

int uc32_cpu_handle_mmu_fault(CPUState *cs, vaddr address,
                              int access_type, int mmu_idx)
{
    UniCore32CPU *cpu = UNICORE32_CPU(cs);
    CPUUniCore32State *env = &cpu->env;
    uint32_t phys_addr;
    target_ulong page_size;
    int prot;
    int ret, is_user;

    ret = 1;
    is_user = mmu_idx == MMU_USER_IDX;

    if ((env->cp0.c1_sys & 1) == 0) {
        /* MMU disabled.  */
        phys_addr = address;
        prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
        page_size = TARGET_PAGE_SIZE;
        ret = 0;
    } else {
        if ((address & (1 << 31)) || (is_user)) {
            ret = get_phys_addr_ucv2(env, address, access_type, is_user,
                                    &phys_addr, &prot, &page_size);
            if (is_user) {
                DPRINTF("user space access: ret %x, address %" VADDR_PRIx ", "
                        "access_type %x, phys_addr %x, prot %x\n",
                        ret, address, access_type, phys_addr, prot);
            }
        } else {
            /*IO memory */
            phys_addr = address | (1 << 31);
            prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
            page_size = TARGET_PAGE_SIZE;
            ret = 0;
        }
    }

    if (ret == 0) {
        /* Map a single page.  */
        phys_addr &= TARGET_PAGE_MASK;
        address &= TARGET_PAGE_MASK;
        tlb_set_page(cs, address, phys_addr, prot, mmu_idx, page_size);
        return 0;
    }

    env->cp0.c3_faultstatus = ret;
    env->cp0.c4_faultaddr = address;
    if (access_type == 2) {
        cs->exception_index = UC32_EXCP_ITRAP;
    } else {
        cs->exception_index = UC32_EXCP_DTRAP;
    }
    return ret;
}

hwaddr uc32_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
{
    UniCore32CPU *cpu = UNICORE32_CPU(cs);

    cpu_abort(CPU(cpu), "%s not supported yet\n", __func__);
    return addr;
}
Commit	Line	Data
4f23a1e6 GX	1	/*
	2	* Softmmu related functions
	3	*
	4	* Copyright (C) 2010-2012 Guan Xuetao
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation, or any later version.
	9	* See the COPYING file in the top-level directory.
	10	*/
	11	#ifdef CONFIG_USER_ONLY
	12	#error This file only exist under softmmu circumstance
	13	#endif
	14
	15	#include <cpu.h>
	16
f3ccc323 GX	17	#undef DEBUG_UC32
	18
	19	#ifdef DEBUG_UC32
	20	#define DPRINTF(fmt, ...) printf("%s: " fmt , __func__, ## __VA_ARGS__)
	21	#else
	22	#define DPRINTF(fmt, ...) do {} while (0)
	23	#endif
	24
	25	#define SUPERPAGE_SIZE (1 << 22)
	26	#define UC32_PAGETABLE_READ (1 << 8)
	27	#define UC32_PAGETABLE_WRITE (1 << 7)
	28	#define UC32_PAGETABLE_EXEC (1 << 6)
	29	#define UC32_PAGETABLE_EXIST (1 << 2)
	30	#define PAGETABLE_TYPE(x) ((x) & 3)
	31
	32
	33	/* Map CPU modes onto saved register banks. */
447b3b60	34	static inline int bank_number(CPUUniCore32State *env, int mode)
f3ccc323	35	{
a47dddd7 AF	36	UniCore32CPU *cpu = uc32_env_get_cpu(env);
a47dddd7 AF	37
f3ccc323 GX	38	switch (mode) {
	39	case ASR_MODE_USER:
	40	case ASR_MODE_SUSR:
	41	return 0;
	42	case ASR_MODE_PRIV:
	43	return 1;
	44	case ASR_MODE_TRAP:
	45	return 2;
	46	case ASR_MODE_EXTN:
	47	return 3;
	48	case ASR_MODE_INTR:
	49	return 4;
	50	}
a47dddd7	51	cpu_abort(CPU(cpu), "Bad mode %x\n", mode);
f3ccc323 GX	52	return -1;
	53	}
	54
4f23a1e6 GX	55	void switch_mode(CPUUniCore32State *env, int mode)
4f23a1e6 GX	56	{
f3ccc323 GX	57	int old_mode;
	58	int i;
	59
	60	old_mode = env->uncached_asr & ASR_M;
	61	if (mode == old_mode) {
	62	return;
	63	}
	64
447b3b60	65	i = bank_number(env, old_mode);
f3ccc323 GX	66	env->banked_r29[i] = env->regs[29];
	67	env->banked_r30[i] = env->regs[30];
	68	env->banked_bsr[i] = env->bsr;
	69
447b3b60	70	i = bank_number(env, mode);
f3ccc323 GX	71	env->regs[29] = env->banked_r29[i];
	72	env->regs[30] = env->banked_r30[i];
	73	env->bsr = env->banked_bsr[i];
4f23a1e6 GX	74	}
4f23a1e6 GX	75
f3ccc323	76	/* Handle a CPU exception. */
97a8ea5a	77	void uc32_cpu_do_interrupt(CPUState *cs)
4f23a1e6	78	{
97a8ea5a AF	79	UniCore32CPU *cpu = UNICORE32_CPU(cs);
97a8ea5a AF	80	CPUUniCore32State *env = &cpu->env;
f3ccc323 GX	81	uint32_t addr;
	82	int new_mode;
	83
27103424	84	switch (cs->exception_index) {
f3ccc323 GX	85	case UC32_EXCP_PRIV:
	86	new_mode = ASR_MODE_PRIV;
	87	addr = 0x08;
	88	break;
	89	case UC32_EXCP_ITRAP:
	90	DPRINTF("itrap happened at %x\n", env->regs[31]);
	91	new_mode = ASR_MODE_TRAP;
	92	addr = 0x0c;
	93	break;
	94	case UC32_EXCP_DTRAP:
	95	DPRINTF("dtrap happened at %x\n", env->regs[31]);
	96	new_mode = ASR_MODE_TRAP;
	97	addr = 0x10;
	98	break;
	99	case UC32_EXCP_INTR:
	100	new_mode = ASR_MODE_INTR;
	101	addr = 0x18;
	102	break;
	103	default:
a47dddd7	104	cpu_abort(cs, "Unhandled exception 0x%x\n", cs->exception_index);
f3ccc323 GX	105	return;
	106	}
	107	/* High vectors. */
	108	if (env->cp0.c1_sys & (1 << 13)) {
	109	addr += 0xffff0000;
	110	}
	111
	112	switch_mode(env, new_mode);
	113	env->bsr = cpu_asr_read(env);
	114	env->uncached_asr = (env->uncached_asr & ~ASR_M) \| new_mode;
	115	env->uncached_asr \|= ASR_I;
	116	/* The PC already points to the proper instruction. */
	117	env->regs[30] = env->regs[31];
	118	env->regs[31] = addr;
259186a7	119	cs->interrupt_request \|= CPU_INTERRUPT_EXITTB;
f3ccc323 GX	120	}
	121
	122	static int get_phys_addr_ucv2(CPUUniCore32State *env, uint32_t address,
	123	int access_type, int is_user, uint32_t phys_ptr, int prot,
	124	target_ulong *page_size)
	125	{
a47dddd7 AF	126	UniCore32CPU *cpu = uc32_env_get_cpu(env);
a47dddd7 AF	127	CPUState *cs = CPU(cpu);
f3ccc323 GX	128	int code;
	129	uint32_t table;
	130	uint32_t desc;
	131	uint32_t phys_addr;
	132
	133	/* Pagetable walk. */
	134	/* Lookup l1 descriptor. */
	135	table = env->cp0.c2_base & 0xfffff000;
	136	table \|= (address >> 20) & 0xffc;
fdfba1a2	137	desc = ldl_phys(cs->as, table);
f3ccc323 GX	138	code = 0;
	139	switch (PAGETABLE_TYPE(desc)) {
	140	case 3:
	141	/* Superpage */
	142	if (!(desc & UC32_PAGETABLE_EXIST)) {
	143	code = 0x0b; /* superpage miss */
	144	goto do_fault;
	145	}
	146	phys_addr = (desc & 0xffc00000) \| (address & 0x003fffff);
	147	*page_size = SUPERPAGE_SIZE;
	148	break;
	149	case 0:
	150	/* Lookup l2 entry. */
	151	if (is_user) {
	152	DPRINTF("PGD address %x, desc %x\n", table, desc);
	153	}
	154	if (!(desc & UC32_PAGETABLE_EXIST)) {
	155	code = 0x05; /* second pagetable miss */
	156	goto do_fault;
	157	}
	158	table = (desc & 0xfffff000) \| ((address >> 10) & 0xffc);
fdfba1a2	159	desc = ldl_phys(cs->as, table);
f3ccc323 GX	160	/* 4k page. */
	161	if (is_user) {
	162	DPRINTF("PTE address %x, desc %x\n", table, desc);
	163	}
	164	if (!(desc & UC32_PAGETABLE_EXIST)) {
	165	code = 0x08; /* page miss */
	166	goto do_fault;
	167	}
	168	switch (PAGETABLE_TYPE(desc)) {
	169	case 0:
	170	phys_addr = (desc & 0xfffff000) \| (address & 0xfff);
	171	*page_size = TARGET_PAGE_SIZE;
	172	break;
	173	default:
a47dddd7	174	cpu_abort(CPU(cpu), "wrong page type!");
f3ccc323 GX	175	}
	176	break;
	177	default:
a47dddd7	178	cpu_abort(CPU(cpu), "wrong page type!");
f3ccc323 GX	179	}
	180
	181	*phys_ptr = phys_addr;
	182	*prot = 0;
	183	/* Check access permissions. */
	184	if (desc & UC32_PAGETABLE_READ) {
	185	*prot \|= PAGE_READ;
	186	} else {
	187	if (is_user && (access_type == 0)) {
	188	code = 0x11; /* access unreadable area */
	189	goto do_fault;
	190	}
	191	}
	192
	193	if (desc & UC32_PAGETABLE_WRITE) {
	194	*prot \|= PAGE_WRITE;
	195	} else {
	196	if (is_user && (access_type == 1)) {
	197	code = 0x12; /* access unwritable area */
	198	goto do_fault;
	199	}
	200	}
	201
	202	if (desc & UC32_PAGETABLE_EXEC) {
	203	*prot \|= PAGE_EXEC;
	204	} else {
	205	if (is_user && (access_type == 2)) {
	206	code = 0x13; /* access unexecutable area */
	207	goto do_fault;
	208	}
	209	}
	210
	211	do_fault:
	212	return code;
4f23a1e6 GX	213	}
4f23a1e6 GX	214
7510454e	215	int uc32_cpu_handle_mmu_fault(CPUState *cs, vaddr address,
4f23a1e6 GX	216	int access_type, int mmu_idx)
4f23a1e6 GX	217	{
7510454e AF	218	UniCore32CPU *cpu = UNICORE32_CPU(cs);
7510454e AF	219	CPUUniCore32State *env = &cpu->env;
f3ccc323 GX	220	uint32_t phys_addr;
	221	target_ulong page_size;
	222	int prot;
	223	int ret, is_user;
	224
	225	ret = 1;
	226	is_user = mmu_idx == MMU_USER_IDX;
	227
	228	if ((env->cp0.c1_sys & 1) == 0) {
	229	/* MMU disabled. */
	230	phys_addr = address;
	231	prot = PAGE_READ \| PAGE_WRITE \| PAGE_EXEC;
	232	page_size = TARGET_PAGE_SIZE;
	233	ret = 0;
	234	} else {
	235	if ((address & (1 << 31)) \|\| (is_user)) {
	236	ret = get_phys_addr_ucv2(env, address, access_type, is_user,
	237	&phys_addr, &prot, &page_size);
	238	if (is_user) {
7510454e	239	DPRINTF("user space access: ret %x, address %" VADDR_PRIx ", "
f3ccc323 GX	240	"access_type %x, phys_addr %x, prot %x\n",
	241	ret, address, access_type, phys_addr, prot);
	242	}
	243	} else {
	244	/IO memory /
	245	phys_addr = address \| (1 << 31);
	246	prot = PAGE_READ \| PAGE_WRITE \| PAGE_EXEC;
	247	page_size = TARGET_PAGE_SIZE;
	248	ret = 0;
	249	}
	250	}
	251
	252	if (ret == 0) {
	253	/* Map a single page. */
	254	phys_addr &= TARGET_PAGE_MASK;
	255	address &= TARGET_PAGE_MASK;
0c591eb0	256	tlb_set_page(cs, address, phys_addr, prot, mmu_idx, page_size);
f3ccc323 GX	257	return 0;
	258	}
	259
	260	env->cp0.c3_faultstatus = ret;
	261	env->cp0.c4_faultaddr = address;
	262	if (access_type == 2) {
27103424	263	cs->exception_index = UC32_EXCP_ITRAP;
f3ccc323	264	} else {
27103424	265	cs->exception_index = UC32_EXCP_DTRAP;
f3ccc323 GX	266	}
f3ccc323 GX	267	return ret;
4f23a1e6 GX	268	}
4f23a1e6 GX	269
00b941e5	270	hwaddr uc32_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
4f23a1e6	271	{
00b941e5 AF	272	UniCore32CPU *cpu = UNICORE32_CPU(cs);
00b941e5 AF	273
a47dddd7	274	cpu_abort(CPU(cpu), "%s not supported yet\n", __func__);
4f23a1e6 GX	275	return addr;
4f23a1e6 GX	276	}