Archipelago » qemu

/*

 * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *     * Redistributions of source code must retain the above copyright

 *       notice, this list of conditions and the following disclaimer.

 *     * Redistributions in binary form must reproduce the above copyright

 *       notice, this list of conditions and the following disclaimer in the

 *       documentation and/or other materials provided with the distribution.

 *     * Neither the name of the Open Source and Linux Lab nor the

 *       names of its contributors may be used to endorse or promote products

 *       derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY

 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "cpu.h"

#include "dyngen-exec.h"

#include "helpers.h"

#include "host-utils.h"

static void do_unaligned_access(target_ulong addr, int is_write, int is_user,

        void *retaddr);

#define ALIGNED_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"

static void do_restore_state(void *pc_ptr)

{

    TranslationBlock *tb;

    uint32_t pc = (uint32_t)(intptr_t)pc_ptr;

    tb = tb_find_pc(pc);

    if (tb) {

        cpu_restore_state(tb, env, pc);

    }

}

static void do_unaligned_access(target_ulong addr, int is_write, int is_user,

        void *retaddr)

{

    if (xtensa_option_enabled(env->config, XTENSA_OPTION_UNALIGNED_EXCEPTION) &&

            !xtensa_option_enabled(env->config, XTENSA_OPTION_HW_ALIGNMENT)) {

        do_restore_state(retaddr);

        HELPER(exception_cause_vaddr)(

                env->pc, LOAD_STORE_ALIGNMENT_CAUSE, addr);

    }

}

void tlb_fill(target_ulong vaddr, int is_write, int mmu_idx, void *retaddr)

{

    CPUState *saved_env = env;

    env = cpu_single_env;

    {

        uint32_t paddr;

        uint32_t page_size;

        unsigned access;

        int ret = xtensa_get_physical_addr(env, vaddr, is_write, mmu_idx,

                &paddr, &page_size, &access);

        qemu_log("%s(%08x, %d, %d) -> %08x, ret = %d\n", __func__,

                vaddr, is_write, mmu_idx, paddr, ret);

        if (ret == 0) {

            tlb_set_page(env,

                    vaddr & TARGET_PAGE_MASK,

                    paddr & TARGET_PAGE_MASK,

                    access, mmu_idx, page_size);

        } else {

            do_restore_state(retaddr);

            HELPER(exception_cause_vaddr)(env->pc, ret, vaddr);

        }

    }

    env = saved_env;

}

void HELPER(exception)(uint32_t excp)

{

    env->exception_index = excp;

    cpu_loop_exit(env);

}

void HELPER(exception_cause)(uint32_t pc, uint32_t cause)

{

    uint32_t vector;

    env->pc = pc;

    if (env->sregs[PS] & PS_EXCM) {

        if (env->config->ndepc) {

            env->sregs[DEPC] = pc;

        } else {

            env->sregs[EPC1] = pc;

        }

        vector = EXC_DOUBLE;

    } else {

        env->sregs[EPC1] = pc;

        vector = (env->sregs[PS] & PS_UM) ? EXC_USER : EXC_KERNEL;

    }

    env->sregs[EXCCAUSE] = cause;

    env->sregs[PS] |= PS_EXCM;

    HELPER(exception)(vector);

}

void HELPER(exception_cause_vaddr)(uint32_t pc, uint32_t cause, uint32_t vaddr)

{

    env->sregs[EXCVADDR] = vaddr;

    HELPER(exception_cause)(pc, cause);

}

uint32_t HELPER(nsa)(uint32_t v)

{

    if (v & 0x80000000) {

        v = ~v;

    }

    return v ? clz32(v) - 1 : 31;

}

uint32_t HELPER(nsau)(uint32_t v)

{

    return v ? clz32(v) : 32;

}

static void copy_window_from_phys(CPUState *env,

        uint32_t window, uint32_t phys, uint32_t n)

{

    assert(phys < env->config->nareg);

    if (phys + n <= env->config->nareg) {

        memcpy(env->regs + window, env->phys_regs + phys,

                n * sizeof(uint32_t));

    } else {

        uint32_t n1 = env->config->nareg - phys;

        memcpy(env->regs + window, env->phys_regs + phys,

                n1 * sizeof(uint32_t));

        memcpy(env->regs + window + n1, env->phys_regs,

                (n - n1) * sizeof(uint32_t));

    }

}

static void copy_phys_from_window(CPUState *env,

        uint32_t phys, uint32_t window, uint32_t n)

{

    assert(phys < env->config->nareg);

    if (phys + n <= env->config->nareg) {

        memcpy(env->phys_regs + phys, env->regs + window,

                n * sizeof(uint32_t));

    } else {

        uint32_t n1 = env->config->nareg - phys;

        memcpy(env->phys_regs + phys, env->regs + window,

                n1 * sizeof(uint32_t));

        memcpy(env->phys_regs, env->regs + window + n1,

                (n - n1) * sizeof(uint32_t));

    }

}

static inline unsigned windowbase_bound(unsigned a, const CPUState *env)

{

    return a & (env->config->nareg / 4 - 1);

}

static inline unsigned windowstart_bit(unsigned a, const CPUState *env)

{

    return 1 << windowbase_bound(a, env);

}

void xtensa_sync_window_from_phys(CPUState *env)

{

    copy_window_from_phys(env, 0, env->sregs[WINDOW_BASE] * 4, 16);

}

void xtensa_sync_phys_from_window(CPUState *env)

{

    copy_phys_from_window(env, env->sregs[WINDOW_BASE] * 4, 0, 16);

}

static void rotate_window_abs(uint32_t position)

{

    xtensa_sync_phys_from_window(env);

    env->sregs[WINDOW_BASE] = windowbase_bound(position, env);

    xtensa_sync_window_from_phys(env);

}

static void rotate_window(uint32_t delta)

{

    rotate_window_abs(env->sregs[WINDOW_BASE] + delta);

}

void HELPER(wsr_windowbase)(uint32_t v)

{

    rotate_window_abs(v);

}

void HELPER(entry)(uint32_t pc, uint32_t s, uint32_t imm)

{

    int callinc = (env->sregs[PS] & PS_CALLINC) >> PS_CALLINC_SHIFT;

    if (s > 3 || ((env->sregs[PS] & (PS_WOE | PS_EXCM)) ^ PS_WOE) != 0) {

        qemu_log("Illegal entry instruction(pc = %08x), PS = %08x\n",

                pc, env->sregs[PS]);

        HELPER(exception_cause)(pc, ILLEGAL_INSTRUCTION_CAUSE);

    } else {

        env->regs[(callinc << 2) | (s & 3)] = env->regs[s] - (imm << 3);

        rotate_window(callinc);

        env->sregs[WINDOW_START] |=

            windowstart_bit(env->sregs[WINDOW_BASE], env);

    }

}

void HELPER(window_check)(uint32_t pc, uint32_t w)

{

    uint32_t windowbase = windowbase_bound(env->sregs[WINDOW_BASE], env);

    uint32_t windowstart = env->sregs[WINDOW_START];

    uint32_t m, n;

    if ((env->sregs[PS] & (PS_WOE | PS_EXCM)) ^ PS_WOE) {

        return;

    }

    for (n = 1; ; ++n) {

        if (n > w) {

            return;

        }

        if (windowstart & windowstart_bit(windowbase + n, env)) {

            break;

        }

    }

    m = windowbase_bound(windowbase + n, env);

    rotate_window(n);

    env->sregs[PS] = (env->sregs[PS] & ~PS_OWB) |

        (windowbase << PS_OWB_SHIFT) | PS_EXCM;

    env->sregs[EPC1] = env->pc = pc;

    if (windowstart & windowstart_bit(m + 1, env)) {

        HELPER(exception)(EXC_WINDOW_OVERFLOW4);

    } else if (windowstart & windowstart_bit(m + 2, env)) {

        HELPER(exception)(EXC_WINDOW_OVERFLOW8);

    } else {

        HELPER(exception)(EXC_WINDOW_OVERFLOW12);

    }

}

uint32_t HELPER(retw)(uint32_t pc)

{

    int n = (env->regs[0] >> 30) & 0x3;

    int m = 0;

    uint32_t windowbase = windowbase_bound(env->sregs[WINDOW_BASE], env);

    uint32_t windowstart = env->sregs[WINDOW_START];

    uint32_t ret_pc = 0;

    if (windowstart & windowstart_bit(windowbase - 1, env)) {

        m = 1;

    } else if (windowstart & windowstart_bit(windowbase - 2, env)) {

        m = 2;

    } else if (windowstart & windowstart_bit(windowbase - 3, env)) {

        m = 3;

    }

    if (n == 0 || (m != 0 && m != n) ||

            ((env->sregs[PS] & (PS_WOE | PS_EXCM)) ^ PS_WOE) != 0) {

        qemu_log("Illegal retw instruction(pc = %08x), "

                "PS = %08x, m = %d, n = %d\n",

                pc, env->sregs[PS], m, n);

        HELPER(exception_cause)(pc, ILLEGAL_INSTRUCTION_CAUSE);

    } else {

        int owb = windowbase;

        ret_pc = (pc & 0xc0000000) | (env->regs[0] & 0x3fffffff);

        rotate_window(-n);

        if (windowstart & windowstart_bit(env->sregs[WINDOW_BASE], env)) {

            env->sregs[WINDOW_START] &= ~windowstart_bit(owb, env);

        } else {

            /* window underflow */

            env->sregs[PS] = (env->sregs[PS] & ~PS_OWB) |

                (windowbase << PS_OWB_SHIFT) | PS_EXCM;

            env->sregs[EPC1] = env->pc = pc;

            if (n == 1) {

                HELPER(exception)(EXC_WINDOW_UNDERFLOW4);

            } else if (n == 2) {

                HELPER(exception)(EXC_WINDOW_UNDERFLOW8);

            } else if (n == 3) {

                HELPER(exception)(EXC_WINDOW_UNDERFLOW12);

            }

        }

    }

    return ret_pc;

}

void HELPER(rotw)(uint32_t imm4)

{

    rotate_window(imm4);

}

void HELPER(restore_owb)(void)

{

    rotate_window_abs((env->sregs[PS] & PS_OWB) >> PS_OWB_SHIFT);

}

void HELPER(movsp)(uint32_t pc)

{

    if ((env->sregs[WINDOW_START] &

            (windowstart_bit(env->sregs[WINDOW_BASE] - 3, env) |

             windowstart_bit(env->sregs[WINDOW_BASE] - 2, env) |

             windowstart_bit(env->sregs[WINDOW_BASE] - 1, env))) == 0) {

        HELPER(exception_cause)(pc, ALLOCA_CAUSE);

    }

}

void HELPER(wsr_lbeg)(uint32_t v)

{

    if (env->sregs[LBEG] != v) {

        tb_invalidate_phys_page_range(

                env->sregs[LEND] - 1, env->sregs[LEND], 0);

        env->sregs[LBEG] = v;

    }

}

void HELPER(wsr_lend)(uint32_t v)

{

    if (env->sregs[LEND] != v) {

        tb_invalidate_phys_page_range(

                env->sregs[LEND] - 1, env->sregs[LEND], 0);

        env->sregs[LEND] = v;

        tb_invalidate_phys_page_range(

                env->sregs[LEND] - 1, env->sregs[LEND], 0);

    }

}

void HELPER(dump_state)(void)

{

    cpu_dump_state(env, stderr, fprintf, 0);

}

void HELPER(waiti)(uint32_t pc, uint32_t intlevel)

{

    env->pc = pc;

    env->sregs[PS] = (env->sregs[PS] & ~PS_INTLEVEL) |

        (intlevel << PS_INTLEVEL_SHIFT);

    check_interrupts(env);

    if (env->pending_irq_level) {

        cpu_loop_exit(env);

        return;

    }

    if (xtensa_option_enabled(env->config, XTENSA_OPTION_TIMER_INTERRUPT)) {

        int i;

        uint32_t wake_ccount = env->sregs[CCOUNT] - 1;

        for (i = 0; i < env->config->nccompare; ++i) {

            if (env->sregs[CCOMPARE + i] - env->sregs[CCOUNT] <

                    wake_ccount - env->sregs[CCOUNT]) {

                wake_ccount = env->sregs[CCOMPARE + i];

            }

        }

        env->wake_ccount = wake_ccount;

        qemu_mod_timer(env->ccompare_timer, qemu_get_clock_ns(vm_clock) +

                muldiv64(wake_ccount - env->sregs[CCOUNT],

                    1000000, env->config->clock_freq_khz));

    }

    env->halt_clock = qemu_get_clock_ns(vm_clock);

    env->halted = 1;

    HELPER(exception)(EXCP_HLT);

}

void HELPER(timer_irq)(uint32_t id, uint32_t active)

{

    xtensa_timer_irq(env, id, active);

}

void HELPER(advance_ccount)(uint32_t d)

{

    xtensa_advance_ccount(env, d);

}

void HELPER(check_interrupts)(CPUState *env)

{

    check_interrupts(env);

}

void HELPER(wsr_rasid)(uint32_t v)

{

    v = (v & 0xffffff00) | 0x1;

    if (v != env->sregs[RASID]) {

        env->sregs[RASID] = v;

        tlb_flush(env, 1);

    }

}

static uint32_t get_page_size(const CPUState *env, bool dtlb, uint32_t way)

{

    uint32_t tlbcfg = env->sregs[dtlb ? DTLBCFG : ITLBCFG];

    switch (way) {

    case 4:

        return (tlbcfg >> 16) & 0x3;

    case 5:

        return (tlbcfg >> 20) & 0x1;

    case 6:

        return (tlbcfg >> 24) & 0x1;

    default:

        return 0;

    }

}

/*!

 * Get bit mask for the virtual address bits translated by the TLB way

 */

uint32_t xtensa_tlb_get_addr_mask(const CPUState *env, bool dtlb, uint32_t way)

{

    if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {

        bool varway56 = dtlb ?

            env->config->dtlb.varway56 :

            env->config->itlb.varway56;

        switch (way) {

        case 4:

            return 0xfff00000 << get_page_size(env, dtlb, way) * 2;

        case 5:

            if (varway56) {

                return 0xf8000000 << get_page_size(env, dtlb, way);

            } else {

                return 0xf8000000;

            }

        case 6:

            if (varway56) {

                return 0xf0000000 << (1 - get_page_size(env, dtlb, way));

            } else {

                return 0xf0000000;

            }

        default:

            return 0xfffff000;

        }

    } else {

        return REGION_PAGE_MASK;

    }

}

/*!

 * Get bit mask for the 'VPN without index' field.

 * See ISA, 4.6.5.6, data format for RxTLB0

 */

static uint32_t get_vpn_mask(const CPUState *env, bool dtlb, uint32_t way)

{

    if (way < 4) {

        bool is32 = (dtlb ?

                env->config->dtlb.nrefillentries :

                env->config->itlb.nrefillentries) == 32;

        return is32 ? 0xffff8000 : 0xffffc000;

    } else if (way == 4) {

        return xtensa_tlb_get_addr_mask(env, dtlb, way) << 2;

    } else if (way <= 6) {

        uint32_t mask = xtensa_tlb_get_addr_mask(env, dtlb, way);

        bool varway56 = dtlb ?

            env->config->dtlb.varway56 :

            env->config->itlb.varway56;

        if (varway56) {

            return mask << (way == 5 ? 2 : 3);

        } else {

            return mask << 1;

        }

    } else {

        return 0xfffff000;

    }

}

/*!

 * Split virtual address into VPN (with index) and entry index

 * for the given TLB way

 */

void split_tlb_entry_spec_way(const CPUState *env, uint32_t v, bool dtlb,

        uint32_t *vpn, uint32_t wi, uint32_t *ei)

{

    bool varway56 = dtlb ?

        env->config->dtlb.varway56 :

        env->config->itlb.varway56;

    if (!dtlb) {

        wi &= 7;

    }

    if (wi < 4) {

        bool is32 = (dtlb ?

                env->config->dtlb.nrefillentries :

                env->config->itlb.nrefillentries) == 32;

        *ei = (v >> 12) & (is32 ? 0x7 : 0x3);

    } else {

        switch (wi) {

        case 4:

            {

                uint32_t eibase = 20 + get_page_size(env, dtlb, wi) * 2;

                *ei = (v >> eibase) & 0x3;

            }

            break;

        case 5:

            if (varway56) {

                uint32_t eibase = 27 + get_page_size(env, dtlb, wi);

                *ei = (v >> eibase) & 0x3;

            } else {

                *ei = (v >> 27) & 0x1;

            }

            break;

        case 6:

            if (varway56) {

                uint32_t eibase = 29 - get_page_size(env, dtlb, wi);

                *ei = (v >> eibase) & 0x7;

            } else {

                *ei = (v >> 28) & 0x1;

            }

            break;

        default:

            *ei = 0;

            break;

        }

    }

    *vpn = v & xtensa_tlb_get_addr_mask(env, dtlb, wi);

}

/*!

 * Split TLB address into TLB way, entry index and VPN (with index).

 * See ISA, 4.6.5.5 - 4.6.5.8 for the TLB addressing format

 */

static void split_tlb_entry_spec(uint32_t v, bool dtlb,

        uint32_t *vpn, uint32_t *wi, uint32_t *ei)

{

    if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {

        *wi = v & (dtlb ? 0xf : 0x7);

        split_tlb_entry_spec_way(env, v, dtlb, vpn, *wi, ei);

    } else {

        *vpn = v & REGION_PAGE_MASK;

        *wi = 0;

        *ei = (v >> 29) & 0x7;

    }

}

static xtensa_tlb_entry *get_tlb_entry(uint32_t v, bool dtlb, uint32_t *pwi)

{

    uint32_t vpn;

    uint32_t wi;

    uint32_t ei;

    split_tlb_entry_spec(v, dtlb, &vpn, &wi, &ei);

    if (pwi) {

        *pwi = wi;

    }

    return xtensa_tlb_get_entry(env, dtlb, wi, ei);

}

uint32_t HELPER(rtlb0)(uint32_t v, uint32_t dtlb)

{

    if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {

        uint32_t wi;

        const xtensa_tlb_entry *entry = get_tlb_entry(v, dtlb, &wi);

        return (entry->vaddr & get_vpn_mask(env, dtlb, wi)) | entry->asid;

    } else {

        return v & REGION_PAGE_MASK;

    }

}

uint32_t HELPER(rtlb1)(uint32_t v, uint32_t dtlb)

{

    const xtensa_tlb_entry *entry = get_tlb_entry(v, dtlb, NULL);

    return entry->paddr | entry->attr;

}

void HELPER(itlb)(uint32_t v, uint32_t dtlb)

{

    if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {

        uint32_t wi;

        xtensa_tlb_entry *entry = get_tlb_entry(v, dtlb, &wi);

        if (entry->variable && entry->asid) {

            tlb_flush_page(env, entry->vaddr);

            entry->asid = 0;

        }

    }

}

uint32_t HELPER(ptlb)(uint32_t v, uint32_t dtlb)

{

    if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {

        uint32_t wi;

        uint32_t ei;

        uint8_t ring;

        int res = xtensa_tlb_lookup(env, v, dtlb, &wi, &ei, &ring);

        switch (res) {

        case 0:

            if (ring >= xtensa_get_ring(env)) {

                return (v & 0xfffff000) | wi | (dtlb ? 0x10 : 0x8);

            }

            break;

        case INST_TLB_MULTI_HIT_CAUSE:

        case LOAD_STORE_TLB_MULTI_HIT_CAUSE:

            HELPER(exception_cause_vaddr)(env->pc, res, v);

            break;

        }

        return 0;

    } else {

        return (v & REGION_PAGE_MASK) | 0x1;

    }

}

void xtensa_tlb_set_entry(CPUState *env, bool dtlb,

        unsigned wi, unsigned ei, uint32_t vpn, uint32_t pte)

{

    xtensa_tlb_entry *entry = xtensa_tlb_get_entry(env, dtlb, wi, ei);

    if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {

        if (entry->variable) {

            if (entry->asid) {

                tlb_flush_page(env, entry->vaddr);

            }

            entry->vaddr = vpn;

            entry->paddr = pte & xtensa_tlb_get_addr_mask(env, dtlb, wi);

            entry->asid = (env->sregs[RASID] >> ((pte >> 1) & 0x18)) & 0xff;

            entry->attr = pte & 0xf;

        } else {

            qemu_log("%s %d, %d, %d trying to set immutable entry\n",

                    __func__, dtlb, wi, ei);

        }

    } else {

        tlb_flush_page(env, entry->vaddr);

        if (xtensa_option_enabled(env->config,

                    XTENSA_OPTION_REGION_TRANSLATION)) {

            entry->paddr = pte & REGION_PAGE_MASK;

        }

        entry->attr = pte & 0xf;

    }

}

void HELPER(wtlb)(uint32_t p, uint32_t v, uint32_t dtlb)

{

    uint32_t vpn;

    uint32_t wi;

    uint32_t ei;

    split_tlb_entry_spec(v, dtlb, &vpn, &wi, &ei);

    xtensa_tlb_set_entry(env, dtlb, wi, ei, vpn, p);

}