target/arm: Move pmsav7_use_background_region to ptw.c

[qemu.git] / target / arm / ptw.c

/*
 * ARM page table walking.
 *
 * This code is licensed under the GNU GPL v2 or later.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/range.h"
#include "cpu.h"
#include "internals.h"
#include "ptw.h"


static bool get_phys_addr_v5(CPUARMState *env, uint32_t address,
                             MMUAccessType access_type, ARMMMUIdx mmu_idx,
                             hwaddr *phys_ptr, int *prot,
                             target_ulong *page_size,
                             ARMMMUFaultInfo *fi)
{
    CPUState *cs = env_cpu(env);
    int level = 1;
    uint32_t table;
    uint32_t desc;
    int type;
    int ap;
    int domain = 0;
    int domain_prot;
    hwaddr phys_addr;
    uint32_t dacr;

    /* Pagetable walk.  */
    /* Lookup l1 descriptor.  */
    if (!get_level1_table_address(env, mmu_idx, &table, address)) {
        /* Section translation fault if page walk is disabled by PD0 or PD1 */
        fi->type = ARMFault_Translation;
        goto do_fault;
    }
    desc = arm_ldl_ptw(cs, table, regime_is_secure(env, mmu_idx),
                       mmu_idx, fi);
    if (fi->type != ARMFault_None) {
        goto do_fault;
    }
    type = (desc & 3);
    domain = (desc >> 5) & 0x0f;
    if (regime_el(env, mmu_idx) == 1) {
        dacr = env->cp15.dacr_ns;
    } else {
        dacr = env->cp15.dacr_s;
    }
    domain_prot = (dacr >> (domain * 2)) & 3;
    if (type == 0) {
        /* Section translation fault.  */
        fi->type = ARMFault_Translation;
        goto do_fault;
    }
    if (type != 2) {
        level = 2;
    }
    if (domain_prot == 0 || domain_prot == 2) {
        fi->type = ARMFault_Domain;
        goto do_fault;
    }
    if (type == 2) {
        /* 1Mb section.  */
        phys_addr = (desc & 0xfff00000) | (address & 0x000fffff);
        ap = (desc >> 10) & 3;
        *page_size = 1024 * 1024;
    } else {
        /* Lookup l2 entry.  */
        if (type == 1) {
            /* Coarse pagetable.  */
            table = (desc & 0xfffffc00) | ((address >> 10) & 0x3fc);
        } else {
            /* Fine pagetable.  */
            table = (desc & 0xfffff000) | ((address >> 8) & 0xffc);
        }
        desc = arm_ldl_ptw(cs, table, regime_is_secure(env, mmu_idx),
                           mmu_idx, fi);
        if (fi->type != ARMFault_None) {
            goto do_fault;
        }
        switch (desc & 3) {
        case 0: /* Page translation fault.  */
            fi->type = ARMFault_Translation;
            goto do_fault;
        case 1: /* 64k page.  */
            phys_addr = (desc & 0xffff0000) | (address & 0xffff);
            ap = (desc >> (4 + ((address >> 13) & 6))) & 3;
            *page_size = 0x10000;
            break;
        case 2: /* 4k page.  */
            phys_addr = (desc & 0xfffff000) | (address & 0xfff);
            ap = (desc >> (4 + ((address >> 9) & 6))) & 3;
            *page_size = 0x1000;
            break;
        case 3: /* 1k page, or ARMv6/XScale "extended small (4k) page" */
            if (type == 1) {
                /* ARMv6/XScale extended small page format */
                if (arm_feature(env, ARM_FEATURE_XSCALE)
                    || arm_feature(env, ARM_FEATURE_V6)) {
                    phys_addr = (desc & 0xfffff000) | (address & 0xfff);
                    *page_size = 0x1000;
                } else {
                    /*
                     * UNPREDICTABLE in ARMv5; we choose to take a
                     * page translation fault.
                     */
                    fi->type = ARMFault_Translation;
                    goto do_fault;
                }
            } else {
                phys_addr = (desc & 0xfffffc00) | (address & 0x3ff);
                *page_size = 0x400;
            }
            ap = (desc >> 4) & 3;
            break;
        default:
            /* Never happens, but compiler isn't smart enough to tell.  */
            g_assert_not_reached();
        }
    }
    *prot = ap_to_rw_prot(env, mmu_idx, ap, domain_prot);
    *prot |= *prot ? PAGE_EXEC : 0;
    if (!(*prot & (1 << access_type))) {
        /* Access permission fault.  */
        fi->type = ARMFault_Permission;
        goto do_fault;
    }
    *phys_ptr = phys_addr;
    return false;
do_fault:
    fi->domain = domain;
    fi->level = level;
    return true;
}

static bool get_phys_addr_v6(CPUARMState *env, uint32_t address,
                             MMUAccessType access_type, ARMMMUIdx mmu_idx,
                             hwaddr *phys_ptr, MemTxAttrs *attrs, int *prot,
                             target_ulong *page_size, ARMMMUFaultInfo *fi)
{
    CPUState *cs = env_cpu(env);
    ARMCPU *cpu = env_archcpu(env);
    int level = 1;
    uint32_t table;
    uint32_t desc;
    uint32_t xn;
    uint32_t pxn = 0;
    int type;
    int ap;
    int domain = 0;
    int domain_prot;
    hwaddr phys_addr;
    uint32_t dacr;
    bool ns;

    /* Pagetable walk.  */
    /* Lookup l1 descriptor.  */
    if (!get_level1_table_address(env, mmu_idx, &table, address)) {
        /* Section translation fault if page walk is disabled by PD0 or PD1 */
        fi->type = ARMFault_Translation;
        goto do_fault;
    }
    desc = arm_ldl_ptw(cs, table, regime_is_secure(env, mmu_idx),
                       mmu_idx, fi);
    if (fi->type != ARMFault_None) {
        goto do_fault;
    }
    type = (desc & 3);
    if (type == 0 || (type == 3 && !cpu_isar_feature(aa32_pxn, cpu))) {
        /* Section translation fault, or attempt to use the encoding
         * which is Reserved on implementations without PXN.
         */
        fi->type = ARMFault_Translation;
        goto do_fault;
    }
    if ((type == 1) || !(desc & (1 << 18))) {
        /* Page or Section.  */
        domain = (desc >> 5) & 0x0f;
    }
    if (regime_el(env, mmu_idx) == 1) {
        dacr = env->cp15.dacr_ns;
    } else {
        dacr = env->cp15.dacr_s;
    }
    if (type == 1) {
        level = 2;
    }
    domain_prot = (dacr >> (domain * 2)) & 3;
    if (domain_prot == 0 || domain_prot == 2) {
        /* Section or Page domain fault */
        fi->type = ARMFault_Domain;
        goto do_fault;
    }
    if (type != 1) {
        if (desc & (1 << 18)) {
            /* Supersection.  */
            phys_addr = (desc & 0xff000000) | (address & 0x00ffffff);
            phys_addr |= (uint64_t)extract32(desc, 20, 4) << 32;
            phys_addr |= (uint64_t)extract32(desc, 5, 4) << 36;
            *page_size = 0x1000000;
        } else {
            /* Section.  */
            phys_addr = (desc & 0xfff00000) | (address & 0x000fffff);
            *page_size = 0x100000;
        }
        ap = ((desc >> 10) & 3) | ((desc >> 13) & 4);
        xn = desc & (1 << 4);
        pxn = desc & 1;
        ns = extract32(desc, 19, 1);
    } else {
        if (cpu_isar_feature(aa32_pxn, cpu)) {
            pxn = (desc >> 2) & 1;
        }
        ns = extract32(desc, 3, 1);
        /* Lookup l2 entry.  */
        table = (desc & 0xfffffc00) | ((address >> 10) & 0x3fc);
        desc = arm_ldl_ptw(cs, table, regime_is_secure(env, mmu_idx),
                           mmu_idx, fi);
        if (fi->type != ARMFault_None) {
            goto do_fault;
        }
        ap = ((desc >> 4) & 3) | ((desc >> 7) & 4);
        switch (desc & 3) {
        case 0: /* Page translation fault.  */
            fi->type = ARMFault_Translation;
            goto do_fault;
        case 1: /* 64k page.  */
            phys_addr = (desc & 0xffff0000) | (address & 0xffff);
            xn = desc & (1 << 15);
            *page_size = 0x10000;
            break;
        case 2: case 3: /* 4k page.  */
            phys_addr = (desc & 0xfffff000) | (address & 0xfff);
            xn = desc & 1;
            *page_size = 0x1000;
            break;
        default:
            /* Never happens, but compiler isn't smart enough to tell.  */
            g_assert_not_reached();
        }
    }
    if (domain_prot == 3) {
        *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
    } else {
        if (pxn && !regime_is_user(env, mmu_idx)) {
            xn = 1;
        }
        if (xn && access_type == MMU_INST_FETCH) {
            fi->type = ARMFault_Permission;
            goto do_fault;
        }

        if (arm_feature(env, ARM_FEATURE_V6K) &&
                (regime_sctlr(env, mmu_idx) & SCTLR_AFE)) {
            /* The simplified model uses AP[0] as an access control bit.  */
            if ((ap & 1) == 0) {
                /* Access flag fault.  */
                fi->type = ARMFault_AccessFlag;
                goto do_fault;
            }
            *prot = simple_ap_to_rw_prot(env, mmu_idx, ap >> 1);
        } else {
            *prot = ap_to_rw_prot(env, mmu_idx, ap, domain_prot);
        }
        if (*prot && !xn) {
            *prot |= PAGE_EXEC;
        }
        if (!(*prot & (1 << access_type))) {
            /* Access permission fault.  */
            fi->type = ARMFault_Permission;
            goto do_fault;
        }
    }
    if (ns) {
        /* The NS bit will (as required by the architecture) have no effect if
         * the CPU doesn't support TZ or this is a non-secure translation
         * regime, because the attribute will already be non-secure.
         */
        attrs->secure = false;
    }
    *phys_ptr = phys_addr;
    return false;
do_fault:
    fi->domain = domain;
    fi->level = level;
    return true;
}

static bool get_phys_addr_pmsav5(CPUARMState *env, uint32_t address,
                                 MMUAccessType access_type, ARMMMUIdx mmu_idx,
                                 hwaddr *phys_ptr, int *prot,
                                 ARMMMUFaultInfo *fi)
{
    int n;
    uint32_t mask;
    uint32_t base;
    bool is_user = regime_is_user(env, mmu_idx);

    if (regime_translation_disabled(env, mmu_idx)) {
        /* MPU disabled.  */
        *phys_ptr = address;
        *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
        return false;
    }

    *phys_ptr = address;
    for (n = 7; n >= 0; n--) {
        base = env->cp15.c6_region[n];
        if ((base & 1) == 0) {
            continue;
        }
        mask = 1 << ((base >> 1) & 0x1f);
        /* Keep this shift separate from the above to avoid an
           (undefined) << 32.  */
        mask = (mask << 1) - 1;
        if (((base ^ address) & ~mask) == 0) {
            break;
        }
    }
    if (n < 0) {
        fi->type = ARMFault_Background;
        return true;
    }

    if (access_type == MMU_INST_FETCH) {
        mask = env->cp15.pmsav5_insn_ap;
    } else {
        mask = env->cp15.pmsav5_data_ap;
    }
    mask = (mask >> (n * 4)) & 0xf;
    switch (mask) {
    case 0:
        fi->type = ARMFault_Permission;
        fi->level = 1;
        return true;
    case 1:
        if (is_user) {
            fi->type = ARMFault_Permission;
            fi->level = 1;
            return true;
        }
        *prot = PAGE_READ | PAGE_WRITE;
        break;
    case 2:
        *prot = PAGE_READ;
        if (!is_user) {
            *prot |= PAGE_WRITE;
        }
        break;
    case 3:
        *prot = PAGE_READ | PAGE_WRITE;
        break;
    case 5:
        if (is_user) {
            fi->type = ARMFault_Permission;
            fi->level = 1;
            return true;
        }
        *prot = PAGE_READ;
        break;
    case 6:
        *prot = PAGE_READ;
        break;
    default:
        /* Bad permission.  */
        fi->type = ARMFault_Permission;
        fi->level = 1;
        return true;
    }
    *prot |= PAGE_EXEC;
    return false;
}

static void get_phys_addr_pmsav7_default(CPUARMState *env, ARMMMUIdx mmu_idx,
                                         int32_t address, int *prot)
{
    if (!arm_feature(env, ARM_FEATURE_M)) {
        *prot = PAGE_READ | PAGE_WRITE;
        switch (address) {
        case 0xF0000000 ... 0xFFFFFFFF:
            if (regime_sctlr(env, mmu_idx) & SCTLR_V) {
                /* hivecs execing is ok */
                *prot |= PAGE_EXEC;
            }
            break;
        case 0x00000000 ... 0x7FFFFFFF:
            *prot |= PAGE_EXEC;
            break;
        }
    } else {
        /* Default system address map for M profile cores.
         * The architecture specifies which regions are execute-never;
         * at the MPU level no other checks are defined.
         */
        switch (address) {
        case 0x00000000 ... 0x1fffffff: /* ROM */
        case 0x20000000 ... 0x3fffffff: /* SRAM */
        case 0x60000000 ... 0x7fffffff: /* RAM */
        case 0x80000000 ... 0x9fffffff: /* RAM */
            *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
            break;
        case 0x40000000 ... 0x5fffffff: /* Peripheral */
        case 0xa0000000 ... 0xbfffffff: /* Device */
        case 0xc0000000 ... 0xdfffffff: /* Device */
        case 0xe0000000 ... 0xffffffff: /* System */
            *prot = PAGE_READ | PAGE_WRITE;
            break;
        default:
            g_assert_not_reached();
        }
    }
}

static bool pmsav7_use_background_region(ARMCPU *cpu, ARMMMUIdx mmu_idx,
                                         bool is_user)
{
    /*
     * Return true if we should use the default memory map as a
     * "background" region if there are no hits against any MPU regions.
     */
    CPUARMState *env = &cpu->env;

    if (is_user) {
        return false;
    }

    if (arm_feature(env, ARM_FEATURE_M)) {
        return env->v7m.mpu_ctrl[regime_is_secure(env, mmu_idx)]
            & R_V7M_MPU_CTRL_PRIVDEFENA_MASK;
    } else {
        return regime_sctlr(env, mmu_idx) & SCTLR_BR;
    }
}

static bool get_phys_addr_pmsav7(CPUARMState *env, uint32_t address,
                                 MMUAccessType access_type, ARMMMUIdx mmu_idx,
                                 hwaddr *phys_ptr, int *prot,
                                 target_ulong *page_size,
                                 ARMMMUFaultInfo *fi)
{
    ARMCPU *cpu = env_archcpu(env);
    int n;
    bool is_user = regime_is_user(env, mmu_idx);

    *phys_ptr = address;
    *page_size = TARGET_PAGE_SIZE;
    *prot = 0;

    if (regime_translation_disabled(env, mmu_idx) ||
        m_is_ppb_region(env, address)) {
        /*
         * MPU disabled or M profile PPB access: use default memory map.
         * The other case which uses the default memory map in the
         * v7M ARM ARM pseudocode is exception vector reads from the vector
         * table. In QEMU those accesses are done in arm_v7m_load_vector(),
         * which always does a direct read using address_space_ldl(), rather
         * than going via this function, so we don't need to check that here.
         */
        get_phys_addr_pmsav7_default(env, mmu_idx, address, prot);
    } else { /* MPU enabled */
        for (n = (int)cpu->pmsav7_dregion - 1; n >= 0; n--) {
            /* region search */
            uint32_t base = env->pmsav7.drbar[n];
            uint32_t rsize = extract32(env->pmsav7.drsr[n], 1, 5);
            uint32_t rmask;
            bool srdis = false;

            if (!(env->pmsav7.drsr[n] & 0x1)) {
                continue;
            }

            if (!rsize) {
                qemu_log_mask(LOG_GUEST_ERROR,
                              "DRSR[%d]: Rsize field cannot be 0\n", n);
                continue;
            }
            rsize++;
            rmask = (1ull << rsize) - 1;

            if (base & rmask) {
                qemu_log_mask(LOG_GUEST_ERROR,
                              "DRBAR[%d]: 0x%" PRIx32 " misaligned "
                              "to DRSR region size, mask = 0x%" PRIx32 "\n",
                              n, base, rmask);
                continue;
            }

            if (address < base || address > base + rmask) {
                /*
                 * Address not in this region. We must check whether the
                 * region covers addresses in the same page as our address.
                 * In that case we must not report a size that covers the
                 * whole page for a subsequent hit against a different MPU
                 * region or the background region, because it would result in
                 * incorrect TLB hits for subsequent accesses to addresses that
                 * are in this MPU region.
                 */
                if (ranges_overlap(base, rmask,
                                   address & TARGET_PAGE_MASK,
                                   TARGET_PAGE_SIZE)) {
                    *page_size = 1;
                }
                continue;
            }

            /* Region matched */

            if (rsize >= 8) { /* no subregions for regions < 256 bytes */
                int i, snd;
                uint32_t srdis_mask;

                rsize -= 3; /* sub region size (power of 2) */
                snd = ((address - base) >> rsize) & 0x7;
                srdis = extract32(env->pmsav7.drsr[n], snd + 8, 1);

                srdis_mask = srdis ? 0x3 : 0x0;
                for (i = 2; i <= 8 && rsize < TARGET_PAGE_BITS; i *= 2) {
                    /*
                     * This will check in groups of 2, 4 and then 8, whether
                     * the subregion bits are consistent. rsize is incremented
                     * back up to give the region size, considering consistent
                     * adjacent subregions as one region. Stop testing if rsize
                     * is already big enough for an entire QEMU page.
                     */
                    int snd_rounded = snd & ~(i - 1);
                    uint32_t srdis_multi = extract32(env->pmsav7.drsr[n],
                                                     snd_rounded + 8, i);
                    if (srdis_mask ^ srdis_multi) {
                        break;
                    }
                    srdis_mask = (srdis_mask << i) | srdis_mask;
                    rsize++;
                }
            }
            if (srdis) {
                continue;
            }
            if (rsize < TARGET_PAGE_BITS) {
                *page_size = 1 << rsize;
            }
            break;
        }

        if (n == -1) { /* no hits */
            if (!pmsav7_use_background_region(cpu, mmu_idx, is_user)) {
                /* background fault */
                fi->type = ARMFault_Background;
                return true;
            }
            get_phys_addr_pmsav7_default(env, mmu_idx, address, prot);
        } else { /* a MPU hit! */
            uint32_t ap = extract32(env->pmsav7.dracr[n], 8, 3);
            uint32_t xn = extract32(env->pmsav7.dracr[n], 12, 1);

            if (m_is_system_region(env, address)) {
                /* System space is always execute never */
                xn = 1;
            }

            if (is_user) { /* User mode AP bit decoding */
                switch (ap) {
                case 0:
                case 1:
                case 5:
                    break; /* no access */
                case 3:
                    *prot |= PAGE_WRITE;
                    /* fall through */
                case 2:
                case 6:
                    *prot |= PAGE_READ | PAGE_EXEC;
                    break;
                case 7:
                    /* for v7M, same as 6; for R profile a reserved value */
                    if (arm_feature(env, ARM_FEATURE_M)) {
                        *prot |= PAGE_READ | PAGE_EXEC;
                        break;
                    }
                    /* fall through */
                default:
                    qemu_log_mask(LOG_GUEST_ERROR,
                                  "DRACR[%d]: Bad value for AP bits: 0x%"
                                  PRIx32 "\n", n, ap);
                }
            } else { /* Priv. mode AP bits decoding */
                switch (ap) {
                case 0:
                    break; /* no access */
                case 1:
                case 2:
                case 3:
                    *prot |= PAGE_WRITE;
                    /* fall through */
                case 5:
                case 6:
                    *prot |= PAGE_READ | PAGE_EXEC;
                    break;
                case 7:
                    /* for v7M, same as 6; for R profile a reserved value */
                    if (arm_feature(env, ARM_FEATURE_M)) {
                        *prot |= PAGE_READ | PAGE_EXEC;
                        break;
                    }
                    /* fall through */
                default:
                    qemu_log_mask(LOG_GUEST_ERROR,
                                  "DRACR[%d]: Bad value for AP bits: 0x%"
                                  PRIx32 "\n", n, ap);
                }
            }

            /* execute never */
            if (xn) {
                *prot &= ~PAGE_EXEC;
            }
        }
    }

    fi->type = ARMFault_Permission;
    fi->level = 1;
    return !(*prot & (1 << access_type));
}

bool pmsav8_mpu_lookup(CPUARMState *env, uint32_t address,
                       MMUAccessType access_type, ARMMMUIdx mmu_idx,
                       hwaddr *phys_ptr, MemTxAttrs *txattrs,
                       int *prot, bool *is_subpage,
                       ARMMMUFaultInfo *fi, uint32_t *mregion)
{
    /*
     * Perform a PMSAv8 MPU lookup (without also doing the SAU check
     * that a full phys-to-virt translation does).
     * mregion is (if not NULL) set to the region number which matched,
     * or -1 if no region number is returned (MPU off, address did not
     * hit a region, address hit in multiple regions).
     * We set is_subpage to true if the region hit doesn't cover the
     * entire TARGET_PAGE the address is within.
     */
    ARMCPU *cpu = env_archcpu(env);
    bool is_user = regime_is_user(env, mmu_idx);
    uint32_t secure = regime_is_secure(env, mmu_idx);
    int n;
    int matchregion = -1;
    bool hit = false;
    uint32_t addr_page_base = address & TARGET_PAGE_MASK;
    uint32_t addr_page_limit = addr_page_base + (TARGET_PAGE_SIZE - 1);

    *is_subpage = false;
    *phys_ptr = address;
    *prot = 0;
    if (mregion) {
        *mregion = -1;
    }

    /*
     * Unlike the ARM ARM pseudocode, we don't need to check whether this
     * was an exception vector read from the vector table (which is always
     * done using the default system address map), because those accesses
     * are done in arm_v7m_load_vector(), which always does a direct
     * read using address_space_ldl(), rather than going via this function.
     */
    if (regime_translation_disabled(env, mmu_idx)) { /* MPU disabled */
        hit = true;
    } else if (m_is_ppb_region(env, address)) {
        hit = true;
    } else {
        if (pmsav7_use_background_region(cpu, mmu_idx, is_user)) {
            hit = true;
        }

        for (n = (int)cpu->pmsav7_dregion - 1; n >= 0; n--) {
            /* region search */
            /*
             * Note that the base address is bits [31:5] from the register
             * with bits [4:0] all zeroes, but the limit address is bits
             * [31:5] from the register with bits [4:0] all ones.
             */
            uint32_t base = env->pmsav8.rbar[secure][n] & ~0x1f;
            uint32_t limit = env->pmsav8.rlar[secure][n] | 0x1f;

            if (!(env->pmsav8.rlar[secure][n] & 0x1)) {
                /* Region disabled */
                continue;
            }

            if (address < base || address > limit) {
                /*
                 * Address not in this region. We must check whether the
                 * region covers addresses in the same page as our address.
                 * In that case we must not report a size that covers the
                 * whole page for a subsequent hit against a different MPU
                 * region or the background region, because it would result in
                 * incorrect TLB hits for subsequent accesses to addresses that
                 * are in this MPU region.
                 */
                if (limit >= base &&
                    ranges_overlap(base, limit - base + 1,
                                   addr_page_base,
                                   TARGET_PAGE_SIZE)) {
                    *is_subpage = true;
                }
                continue;
            }

            if (base > addr_page_base || limit < addr_page_limit) {
                *is_subpage = true;
            }

            if (matchregion != -1) {
                /*
                 * Multiple regions match -- always a failure (unlike
                 * PMSAv7 where highest-numbered-region wins)
                 */
                fi->type = ARMFault_Permission;
                fi->level = 1;
                return true;
            }

            matchregion = n;
            hit = true;
        }
    }

    if (!hit) {
        /* background fault */
        fi->type = ARMFault_Background;
        return true;
    }

    if (matchregion == -1) {
        /* hit using the background region */
        get_phys_addr_pmsav7_default(env, mmu_idx, address, prot);
    } else {
        uint32_t ap = extract32(env->pmsav8.rbar[secure][matchregion], 1, 2);
        uint32_t xn = extract32(env->pmsav8.rbar[secure][matchregion], 0, 1);
        bool pxn = false;

        if (arm_feature(env, ARM_FEATURE_V8_1M)) {
            pxn = extract32(env->pmsav8.rlar[secure][matchregion], 4, 1);
        }

        if (m_is_system_region(env, address)) {
            /* System space is always execute never */
            xn = 1;
        }

        *prot = simple_ap_to_rw_prot(env, mmu_idx, ap);
        if (*prot && !xn && !(pxn && !is_user)) {
            *prot |= PAGE_EXEC;
        }
        /*
         * We don't need to look the attribute up in the MAIR0/MAIR1
         * registers because that only tells us about cacheability.
         */
        if (mregion) {
            *mregion = matchregion;
        }
    }

    fi->type = ARMFault_Permission;
    fi->level = 1;
    return !(*prot & (1 << access_type));
}

static bool get_phys_addr_pmsav8(CPUARMState *env, uint32_t address,
                                 MMUAccessType access_type, ARMMMUIdx mmu_idx,
                                 hwaddr *phys_ptr, MemTxAttrs *txattrs,
                                 int *prot, target_ulong *page_size,
                                 ARMMMUFaultInfo *fi)
{
    uint32_t secure = regime_is_secure(env, mmu_idx);
    V8M_SAttributes sattrs = {};
    bool ret;
    bool mpu_is_subpage;

    if (arm_feature(env, ARM_FEATURE_M_SECURITY)) {
        v8m_security_lookup(env, address, access_type, mmu_idx, &sattrs);
        if (access_type == MMU_INST_FETCH) {
            /*
             * Instruction fetches always use the MMU bank and the
             * transaction attribute determined by the fetch address,
             * regardless of CPU state. This is painful for QEMU
             * to handle, because it would mean we need to encode
             * into the mmu_idx not just the (user, negpri) information
             * for the current security state but also that for the
             * other security state, which would balloon the number
             * of mmu_idx values needed alarmingly.
             * Fortunately we can avoid this because it's not actually
             * possible to arbitrarily execute code from memory with
             * the wrong security attribute: it will always generate
             * an exception of some kind or another, apart from the
             * special case of an NS CPU executing an SG instruction
             * in S&NSC memory. So we always just fail the translation
             * here and sort things out in the exception handler
             * (including possibly emulating an SG instruction).
             */
            if (sattrs.ns != !secure) {
                if (sattrs.nsc) {
                    fi->type = ARMFault_QEMU_NSCExec;
                } else {
                    fi->type = ARMFault_QEMU_SFault;
                }
                *page_size = sattrs.subpage ? 1 : TARGET_PAGE_SIZE;
                *phys_ptr = address;
                *prot = 0;
                return true;
            }
        } else {
            /*
             * For data accesses we always use the MMU bank indicated
             * by the current CPU state, but the security attributes
             * might downgrade a secure access to nonsecure.
             */
            if (sattrs.ns) {
                txattrs->secure = false;
            } else if (!secure) {
                /*
                 * NS access to S memory must fault.
                 * Architecturally we should first check whether the
                 * MPU information for this address indicates that we
                 * are doing an unaligned access to Device memory, which
                 * should generate a UsageFault instead. QEMU does not
                 * currently check for that kind of unaligned access though.
                 * If we added it we would need to do so as a special case
                 * for M_FAKE_FSR_SFAULT in arm_v7m_cpu_do_interrupt().
                 */
                fi->type = ARMFault_QEMU_SFault;
                *page_size = sattrs.subpage ? 1 : TARGET_PAGE_SIZE;
                *phys_ptr = address;
                *prot = 0;
                return true;
            }
        }
    }

    ret = pmsav8_mpu_lookup(env, address, access_type, mmu_idx, phys_ptr,
                            txattrs, prot, &mpu_is_subpage, fi, NULL);
    *page_size = sattrs.subpage || mpu_is_subpage ? 1 : TARGET_PAGE_SIZE;
    return ret;
}

/**
 * get_phys_addr - get the physical address for this virtual address
 *
 * Find the physical address corresponding to the given virtual address,
 * by doing a translation table walk on MMU based systems or using the
 * MPU state on MPU based systems.
 *
 * Returns false if the translation was successful. Otherwise, phys_ptr, attrs,
 * prot and page_size may not be filled in, and the populated fsr value provides
 * information on why the translation aborted, in the format of a
 * DFSR/IFSR fault register, with the following caveats:
 *  * we honour the short vs long DFSR format differences.
 *  * the WnR bit is never set (the caller must do this).
 *  * for PSMAv5 based systems we don't bother to return a full FSR format
 *    value.
 *
 * @env: CPUARMState
 * @address: virtual address to get physical address for
 * @access_type: 0 for read, 1 for write, 2 for execute
 * @mmu_idx: MMU index indicating required translation regime
 * @phys_ptr: set to the physical address corresponding to the virtual address
 * @attrs: set to the memory transaction attributes to use
 * @prot: set to the permissions for the page containing phys_ptr
 * @page_size: set to the size of the page containing phys_ptr
 * @fi: set to fault info if the translation fails
 * @cacheattrs: (if non-NULL) set to the cacheability/shareability attributes
 */
bool get_phys_addr(CPUARMState *env, target_ulong address,
                   MMUAccessType access_type, ARMMMUIdx mmu_idx,
                   hwaddr *phys_ptr, MemTxAttrs *attrs, int *prot,
                   target_ulong *page_size,
                   ARMMMUFaultInfo *fi, ARMCacheAttrs *cacheattrs)
{
    ARMMMUIdx s1_mmu_idx = stage_1_mmu_idx(mmu_idx);

    if (mmu_idx != s1_mmu_idx) {
        /*
         * Call ourselves recursively to do the stage 1 and then stage 2
         * translations if mmu_idx is a two-stage regime.
         */
        if (arm_feature(env, ARM_FEATURE_EL2)) {
            hwaddr ipa;
            int s2_prot;
            int ret;
            bool ipa_secure;
            ARMCacheAttrs cacheattrs2 = {};
            ARMMMUIdx s2_mmu_idx;
            bool is_el0;

            ret = get_phys_addr(env, address, access_type, s1_mmu_idx, &ipa,
                                attrs, prot, page_size, fi, cacheattrs);

            /* If S1 fails or S2 is disabled, return early.  */
            if (ret || regime_translation_disabled(env, ARMMMUIdx_Stage2)) {
                *phys_ptr = ipa;
                return ret;
            }

            ipa_secure = attrs->secure;
            if (arm_is_secure_below_el3(env)) {
                if (ipa_secure) {
                    attrs->secure = !(env->cp15.vstcr_el2.raw_tcr & VSTCR_SW);
                } else {
                    attrs->secure = !(env->cp15.vtcr_el2.raw_tcr & VTCR_NSW);
                }
            } else {
                assert(!ipa_secure);
            }

            s2_mmu_idx = attrs->secure ? ARMMMUIdx_Stage2_S : ARMMMUIdx_Stage2;
            is_el0 = mmu_idx == ARMMMUIdx_E10_0 || mmu_idx == ARMMMUIdx_SE10_0;

            /* S1 is done. Now do S2 translation.  */
            ret = get_phys_addr_lpae(env, ipa, access_type, s2_mmu_idx, is_el0,
                                     phys_ptr, attrs, &s2_prot,
                                     page_size, fi, &cacheattrs2);
            fi->s2addr = ipa;
            /* Combine the S1 and S2 perms.  */
            *prot &= s2_prot;

            /* If S2 fails, return early.  */
            if (ret) {
                return ret;
            }

            /* Combine the S1 and S2 cache attributes. */
            if (arm_hcr_el2_eff(env) & HCR_DC) {
                /*
                 * HCR.DC forces the first stage attributes to
                 *  Normal Non-Shareable,
                 *  Inner Write-Back Read-Allocate Write-Allocate,
                 *  Outer Write-Back Read-Allocate Write-Allocate.
                 * Do not overwrite Tagged within attrs.
                 */
                if (cacheattrs->attrs != 0xf0) {
                    cacheattrs->attrs = 0xff;
                }
                cacheattrs->shareability = 0;
            }
            *cacheattrs = combine_cacheattrs(env, *cacheattrs, cacheattrs2);

            /* Check if IPA translates to secure or non-secure PA space. */
            if (arm_is_secure_below_el3(env)) {
                if (ipa_secure) {
                    attrs->secure =
                        !(env->cp15.vstcr_el2.raw_tcr & (VSTCR_SA | VSTCR_SW));
                } else {
                    attrs->secure =
                        !((env->cp15.vtcr_el2.raw_tcr & (VTCR_NSA | VTCR_NSW))
                        || (env->cp15.vstcr_el2.raw_tcr & (VSTCR_SA | VSTCR_SW)));
                }
            }
            return 0;
        } else {
            /*
             * For non-EL2 CPUs a stage1+stage2 translation is just stage 1.
             */
            mmu_idx = stage_1_mmu_idx(mmu_idx);
        }
    }

    /*
     * The page table entries may downgrade secure to non-secure, but
     * cannot upgrade an non-secure translation regime's attributes
     * to secure.
     */
    attrs->secure = regime_is_secure(env, mmu_idx);
    attrs->user = regime_is_user(env, mmu_idx);

    /*
     * Fast Context Switch Extension. This doesn't exist at all in v8.
     * In v7 and earlier it affects all stage 1 translations.
     */
    if (address < 0x02000000 && mmu_idx != ARMMMUIdx_Stage2
        && !arm_feature(env, ARM_FEATURE_V8)) {
        if (regime_el(env, mmu_idx) == 3) {
            address += env->cp15.fcseidr_s;
        } else {
            address += env->cp15.fcseidr_ns;
        }
    }

    if (arm_feature(env, ARM_FEATURE_PMSA)) {
        bool ret;
        *page_size = TARGET_PAGE_SIZE;

        if (arm_feature(env, ARM_FEATURE_V8)) {
            /* PMSAv8 */
            ret = get_phys_addr_pmsav8(env, address, access_type, mmu_idx,
                                       phys_ptr, attrs, prot, page_size, fi);
        } else if (arm_feature(env, ARM_FEATURE_V7)) {
            /* PMSAv7 */
            ret = get_phys_addr_pmsav7(env, address, access_type, mmu_idx,
                                       phys_ptr, prot, page_size, fi);
        } else {
            /* Pre-v7 MPU */
            ret = get_phys_addr_pmsav5(env, address, access_type, mmu_idx,
                                       phys_ptr, prot, fi);
        }
        qemu_log_mask(CPU_LOG_MMU, "PMSA MPU lookup for %s at 0x%08" PRIx32
                      " mmu_idx %u -> %s (prot %c%c%c)\n",
                      access_type == MMU_DATA_LOAD ? "reading" :
                      (access_type == MMU_DATA_STORE ? "writing" : "execute"),
                      (uint32_t)address, mmu_idx,
                      ret ? "Miss" : "Hit",
                      *prot & PAGE_READ ? 'r' : '-',
                      *prot & PAGE_WRITE ? 'w' : '-',
                      *prot & PAGE_EXEC ? 'x' : '-');

        return ret;
    }

    /* Definitely a real MMU, not an MPU */

    if (regime_translation_disabled(env, mmu_idx)) {
        uint64_t hcr;
        uint8_t memattr;

        /*
         * MMU disabled.  S1 addresses within aa64 translation regimes are
         * still checked for bounds -- see AArch64.TranslateAddressS1Off.
         */
        if (mmu_idx != ARMMMUIdx_Stage2 && mmu_idx != ARMMMUIdx_Stage2_S) {
            int r_el = regime_el(env, mmu_idx);
            if (arm_el_is_aa64(env, r_el)) {
                int pamax = arm_pamax(env_archcpu(env));
                uint64_t tcr = env->cp15.tcr_el[r_el].raw_tcr;
                int addrtop, tbi;

                tbi = aa64_va_parameter_tbi(tcr, mmu_idx);
                if (access_type == MMU_INST_FETCH) {
                    tbi &= ~aa64_va_parameter_tbid(tcr, mmu_idx);
                }
                tbi = (tbi >> extract64(address, 55, 1)) & 1;
                addrtop = (tbi ? 55 : 63);

                if (extract64(address, pamax, addrtop - pamax + 1) != 0) {
                    fi->type = ARMFault_AddressSize;
                    fi->level = 0;
                    fi->stage2 = false;
                    return 1;
                }

                /*
                 * When TBI is disabled, we've just validated that all of the
                 * bits above PAMax are zero, so logically we only need to
                 * clear the top byte for TBI.  But it's clearer to follow
                 * the pseudocode set of addrdesc.paddress.
                 */
                address = extract64(address, 0, 52);
            }
        }
        *phys_ptr = address;
        *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
        *page_size = TARGET_PAGE_SIZE;

        /* Fill in cacheattr a-la AArch64.TranslateAddressS1Off. */
        hcr = arm_hcr_el2_eff(env);
        cacheattrs->shareability = 0;
        cacheattrs->is_s2_format = false;
        if (hcr & HCR_DC) {
            if (hcr & HCR_DCT) {
                memattr = 0xf0;  /* Tagged, Normal, WB, RWA */
            } else {
                memattr = 0xff;  /* Normal, WB, RWA */
            }
        } else if (access_type == MMU_INST_FETCH) {
            if (regime_sctlr(env, mmu_idx) & SCTLR_I) {
                memattr = 0xee;  /* Normal, WT, RA, NT */
            } else {
                memattr = 0x44;  /* Normal, NC, No */
            }
            cacheattrs->shareability = 2; /* outer sharable */
        } else {
            memattr = 0x00;      /* Device, nGnRnE */
        }
        cacheattrs->attrs = memattr;
        return 0;
    }

    if (regime_using_lpae_format(env, mmu_idx)) {
        return get_phys_addr_lpae(env, address, access_type, mmu_idx, false,
                                  phys_ptr, attrs, prot, page_size,
                                  fi, cacheattrs);
    } else if (regime_sctlr(env, mmu_idx) & SCTLR_XP) {
        return get_phys_addr_v6(env, address, access_type, mmu_idx,
                                phys_ptr, attrs, prot, page_size, fi);
    } else {
        return get_phys_addr_v5(env, address, access_type, mmu_idx,
                                    phys_ptr, prot, page_size, fi);
    }
}