| /* |
| * S/390 helpers |
| * |
| * Copyright (c) 2009 Ulrich Hecht |
| * Copyright (c) 2011 Alexander Graf |
| * |
| * 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 "cpu.h" |
| #include "exec/gdbstub.h" |
| #include "qemu/timer.h" |
| #ifndef CONFIG_USER_ONLY |
| #include "sysemu/sysemu.h" |
| #endif |
| |
| //#define DEBUG_S390 |
| //#define DEBUG_S390_PTE |
| //#define DEBUG_S390_STDOUT |
| |
| #ifdef DEBUG_S390 |
| #ifdef DEBUG_S390_STDOUT |
| #define DPRINTF(fmt, ...) \ |
| do { fprintf(stderr, fmt, ## __VA_ARGS__); \ |
| qemu_log(fmt, ##__VA_ARGS__); } while (0) |
| #else |
| #define DPRINTF(fmt, ...) \ |
| do { qemu_log(fmt, ## __VA_ARGS__); } while (0) |
| #endif |
| #else |
| #define DPRINTF(fmt, ...) \ |
| do { } while (0) |
| #endif |
| |
| #ifdef DEBUG_S390_PTE |
| #define PTE_DPRINTF DPRINTF |
| #else |
| #define PTE_DPRINTF(fmt, ...) \ |
| do { } while (0) |
| #endif |
| |
| #ifndef CONFIG_USER_ONLY |
| void s390x_tod_timer(void *opaque) |
| { |
| S390CPU *cpu = opaque; |
| CPUS390XState *env = &cpu->env; |
| |
| env->pending_int |= INTERRUPT_TOD; |
| cpu_interrupt(env, CPU_INTERRUPT_HARD); |
| } |
| |
| void s390x_cpu_timer(void *opaque) |
| { |
| S390CPU *cpu = opaque; |
| CPUS390XState *env = &cpu->env; |
| |
| env->pending_int |= INTERRUPT_CPUTIMER; |
| cpu_interrupt(env, CPU_INTERRUPT_HARD); |
| } |
| #endif |
| |
| S390CPU *cpu_s390x_init(const char *cpu_model) |
| { |
| S390CPU *cpu; |
| CPUS390XState *env; |
| static int inited; |
| |
| cpu = S390_CPU(object_new(TYPE_S390_CPU)); |
| env = &cpu->env; |
| |
| if (tcg_enabled() && !inited) { |
| inited = 1; |
| s390x_translate_init(); |
| } |
| |
| env->cpu_model_str = cpu_model; |
| qemu_init_vcpu(env); |
| return cpu; |
| } |
| |
| #if defined(CONFIG_USER_ONLY) |
| |
| void do_interrupt(CPUS390XState *env) |
| { |
| env->exception_index = -1; |
| } |
| |
| int cpu_s390x_handle_mmu_fault(CPUS390XState *env, target_ulong address, |
| int rw, int mmu_idx) |
| { |
| /* fprintf(stderr, "%s: address 0x%lx rw %d mmu_idx %d\n", |
| __func__, address, rw, mmu_idx); */ |
| env->exception_index = EXCP_ADDR; |
| /* FIXME: find out how this works on a real machine */ |
| env->__excp_addr = address; |
| return 1; |
| } |
| |
| #else /* !CONFIG_USER_ONLY */ |
| |
| /* Ensure to exit the TB after this call! */ |
| static void trigger_pgm_exception(CPUS390XState *env, uint32_t code, |
| uint32_t ilc) |
| { |
| env->exception_index = EXCP_PGM; |
| env->int_pgm_code = code; |
| env->int_pgm_ilc = ilc; |
| } |
| |
| static int trans_bits(CPUS390XState *env, uint64_t mode) |
| { |
| int bits = 0; |
| |
| switch (mode) { |
| case PSW_ASC_PRIMARY: |
| bits = 1; |
| break; |
| case PSW_ASC_SECONDARY: |
| bits = 2; |
| break; |
| case PSW_ASC_HOME: |
| bits = 3; |
| break; |
| default: |
| cpu_abort(env, "unknown asc mode\n"); |
| break; |
| } |
| |
| return bits; |
| } |
| |
| static void trigger_prot_fault(CPUS390XState *env, target_ulong vaddr, |
| uint64_t mode) |
| { |
| int ilc = ILC_LATER_INC_2; |
| int bits = trans_bits(env, mode) | 4; |
| |
| DPRINTF("%s: vaddr=%016" PRIx64 " bits=%d\n", __func__, vaddr, bits); |
| |
| stq_phys(env->psa + offsetof(LowCore, trans_exc_code), vaddr | bits); |
| trigger_pgm_exception(env, PGM_PROTECTION, ilc); |
| } |
| |
| static void trigger_page_fault(CPUS390XState *env, target_ulong vaddr, |
| uint32_t type, uint64_t asc, int rw) |
| { |
| int ilc = ILC_LATER; |
| int bits = trans_bits(env, asc); |
| |
| if (rw == 2) { |
| /* code has is undefined ilc */ |
| ilc = 2; |
| } |
| |
| DPRINTF("%s: vaddr=%016" PRIx64 " bits=%d\n", __func__, vaddr, bits); |
| |
| stq_phys(env->psa + offsetof(LowCore, trans_exc_code), vaddr | bits); |
| trigger_pgm_exception(env, type, ilc); |
| } |
| |
| static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr, |
| uint64_t asc, uint64_t asce, int level, |
| target_ulong *raddr, int *flags, int rw) |
| { |
| uint64_t offs = 0; |
| uint64_t origin; |
| uint64_t new_asce; |
| |
| PTE_DPRINTF("%s: 0x%" PRIx64 "\n", __func__, asce); |
| |
| if (((level != _ASCE_TYPE_SEGMENT) && (asce & _REGION_ENTRY_INV)) || |
| ((level == _ASCE_TYPE_SEGMENT) && (asce & _SEGMENT_ENTRY_INV))) { |
| /* XXX different regions have different faults */ |
| DPRINTF("%s: invalid region\n", __func__); |
| trigger_page_fault(env, vaddr, PGM_SEGMENT_TRANS, asc, rw); |
| return -1; |
| } |
| |
| if ((level <= _ASCE_TYPE_MASK) && ((asce & _ASCE_TYPE_MASK) != level)) { |
| trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw); |
| return -1; |
| } |
| |
| if (asce & _ASCE_REAL_SPACE) { |
| /* direct mapping */ |
| |
| *raddr = vaddr; |
| return 0; |
| } |
| |
| origin = asce & _ASCE_ORIGIN; |
| |
| switch (level) { |
| case _ASCE_TYPE_REGION1 + 4: |
| offs = (vaddr >> 50) & 0x3ff8; |
| break; |
| case _ASCE_TYPE_REGION1: |
| offs = (vaddr >> 39) & 0x3ff8; |
| break; |
| case _ASCE_TYPE_REGION2: |
| offs = (vaddr >> 28) & 0x3ff8; |
| break; |
| case _ASCE_TYPE_REGION3: |
| offs = (vaddr >> 17) & 0x3ff8; |
| break; |
| case _ASCE_TYPE_SEGMENT: |
| offs = (vaddr >> 9) & 0x07f8; |
| origin = asce & _SEGMENT_ENTRY_ORIGIN; |
| break; |
| } |
| |
| /* XXX region protection flags */ |
| /* *flags &= ~PAGE_WRITE */ |
| |
| new_asce = ldq_phys(origin + offs); |
| PTE_DPRINTF("%s: 0x%" PRIx64 " + 0x%" PRIx64 " => 0x%016" PRIx64 "\n", |
| __func__, origin, offs, new_asce); |
| |
| if (level != _ASCE_TYPE_SEGMENT) { |
| /* yet another region */ |
| return mmu_translate_asce(env, vaddr, asc, new_asce, level - 4, raddr, |
| flags, rw); |
| } |
| |
| /* PTE */ |
| if (new_asce & _PAGE_INVALID) { |
| DPRINTF("%s: PTE=0x%" PRIx64 " invalid\n", __func__, new_asce); |
| trigger_page_fault(env, vaddr, PGM_PAGE_TRANS, asc, rw); |
| return -1; |
| } |
| |
| if (new_asce & _PAGE_RO) { |
| *flags &= ~PAGE_WRITE; |
| } |
| |
| *raddr = new_asce & _ASCE_ORIGIN; |
| |
| PTE_DPRINTF("%s: PTE=0x%" PRIx64 "\n", __func__, new_asce); |
| |
| return 0; |
| } |
| |
| static int mmu_translate_asc(CPUS390XState *env, target_ulong vaddr, |
| uint64_t asc, target_ulong *raddr, int *flags, |
| int rw) |
| { |
| uint64_t asce = 0; |
| int level, new_level; |
| int r; |
| |
| switch (asc) { |
| case PSW_ASC_PRIMARY: |
| PTE_DPRINTF("%s: asc=primary\n", __func__); |
| asce = env->cregs[1]; |
| break; |
| case PSW_ASC_SECONDARY: |
| PTE_DPRINTF("%s: asc=secondary\n", __func__); |
| asce = env->cregs[7]; |
| break; |
| case PSW_ASC_HOME: |
| PTE_DPRINTF("%s: asc=home\n", __func__); |
| asce = env->cregs[13]; |
| break; |
| } |
| |
| switch (asce & _ASCE_TYPE_MASK) { |
| case _ASCE_TYPE_REGION1: |
| break; |
| case _ASCE_TYPE_REGION2: |
| if (vaddr & 0xffe0000000000000ULL) { |
| DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64 |
| " 0xffe0000000000000ULL\n", __func__, vaddr); |
| trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw); |
| return -1; |
| } |
| break; |
| case _ASCE_TYPE_REGION3: |
| if (vaddr & 0xfffffc0000000000ULL) { |
| DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64 |
| " 0xfffffc0000000000ULL\n", __func__, vaddr); |
| trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw); |
| return -1; |
| } |
| break; |
| case _ASCE_TYPE_SEGMENT: |
| if (vaddr & 0xffffffff80000000ULL) { |
| DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64 |
| " 0xffffffff80000000ULL\n", __func__, vaddr); |
| trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw); |
| return -1; |
| } |
| break; |
| } |
| |
| /* fake level above current */ |
| level = asce & _ASCE_TYPE_MASK; |
| new_level = level + 4; |
| asce = (asce & ~_ASCE_TYPE_MASK) | (new_level & _ASCE_TYPE_MASK); |
| |
| r = mmu_translate_asce(env, vaddr, asc, asce, new_level, raddr, flags, rw); |
| |
| if ((rw == 1) && !(*flags & PAGE_WRITE)) { |
| trigger_prot_fault(env, vaddr, asc); |
| return -1; |
| } |
| |
| return r; |
| } |
| |
| int mmu_translate(CPUS390XState *env, target_ulong vaddr, int rw, uint64_t asc, |
| target_ulong *raddr, int *flags) |
| { |
| int r = -1; |
| uint8_t *sk; |
| |
| *flags = PAGE_READ | PAGE_WRITE | PAGE_EXEC; |
| vaddr &= TARGET_PAGE_MASK; |
| |
| if (!(env->psw.mask & PSW_MASK_DAT)) { |
| *raddr = vaddr; |
| r = 0; |
| goto out; |
| } |
| |
| switch (asc) { |
| case PSW_ASC_PRIMARY: |
| case PSW_ASC_HOME: |
| r = mmu_translate_asc(env, vaddr, asc, raddr, flags, rw); |
| break; |
| case PSW_ASC_SECONDARY: |
| /* |
| * Instruction: Primary |
| * Data: Secondary |
| */ |
| if (rw == 2) { |
| r = mmu_translate_asc(env, vaddr, PSW_ASC_PRIMARY, raddr, flags, |
| rw); |
| *flags &= ~(PAGE_READ | PAGE_WRITE); |
| } else { |
| r = mmu_translate_asc(env, vaddr, PSW_ASC_SECONDARY, raddr, flags, |
| rw); |
| *flags &= ~(PAGE_EXEC); |
| } |
| break; |
| case PSW_ASC_ACCREG: |
| default: |
| hw_error("guest switched to unknown asc mode\n"); |
| break; |
| } |
| |
| out: |
| /* Convert real address -> absolute address */ |
| if (*raddr < 0x2000) { |
| *raddr = *raddr + env->psa; |
| } |
| |
| if (*raddr <= ram_size) { |
| sk = &env->storage_keys[*raddr / TARGET_PAGE_SIZE]; |
| if (*flags & PAGE_READ) { |
| *sk |= SK_R; |
| } |
| |
| if (*flags & PAGE_WRITE) { |
| *sk |= SK_C; |
| } |
| } |
| |
| return r; |
| } |
| |
| int cpu_s390x_handle_mmu_fault(CPUS390XState *env, target_ulong orig_vaddr, |
| int rw, int mmu_idx) |
| { |
| uint64_t asc = env->psw.mask & PSW_MASK_ASC; |
| target_ulong vaddr, raddr; |
| int prot; |
| |
| DPRINTF("%s: address 0x%" PRIx64 " rw %d mmu_idx %d\n", |
| __func__, _vaddr, rw, mmu_idx); |
| |
| orig_vaddr &= TARGET_PAGE_MASK; |
| vaddr = orig_vaddr; |
| |
| /* 31-Bit mode */ |
| if (!(env->psw.mask & PSW_MASK_64)) { |
| vaddr &= 0x7fffffff; |
| } |
| |
| if (mmu_translate(env, vaddr, rw, asc, &raddr, &prot)) { |
| /* Translation ended in exception */ |
| return 1; |
| } |
| |
| /* check out of RAM access */ |
| if (raddr > (ram_size + virtio_size)) { |
| DPRINTF("%s: aaddr %" PRIx64 " > ram_size %" PRIx64 "\n", __func__, |
| (uint64_t)aaddr, (uint64_t)ram_size); |
| trigger_pgm_exception(env, PGM_ADDRESSING, ILC_LATER); |
| return 1; |
| } |
| |
| DPRINTF("%s: set tlb %" PRIx64 " -> %" PRIx64 " (%x)\n", __func__, |
| (uint64_t)vaddr, (uint64_t)raddr, prot); |
| |
| tlb_set_page(env, orig_vaddr, raddr, prot, |
| mmu_idx, TARGET_PAGE_SIZE); |
| |
| return 0; |
| } |
| |
| hwaddr cpu_get_phys_page_debug(CPUS390XState *env, |
| target_ulong vaddr) |
| { |
| target_ulong raddr; |
| int prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; |
| int old_exc = env->exception_index; |
| uint64_t asc = env->psw.mask & PSW_MASK_ASC; |
| |
| /* 31-Bit mode */ |
| if (!(env->psw.mask & PSW_MASK_64)) { |
| vaddr &= 0x7fffffff; |
| } |
| |
| mmu_translate(env, vaddr, 2, asc, &raddr, &prot); |
| env->exception_index = old_exc; |
| |
| return raddr; |
| } |
| |
| void load_psw(CPUS390XState *env, uint64_t mask, uint64_t addr) |
| { |
| if (mask & PSW_MASK_WAIT) { |
| if (!(mask & (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK))) { |
| if (s390_del_running_cpu(env) == 0) { |
| #ifndef CONFIG_USER_ONLY |
| qemu_system_shutdown_request(); |
| #endif |
| } |
| } |
| env->halted = 1; |
| env->exception_index = EXCP_HLT; |
| } |
| |
| env->psw.addr = addr; |
| env->psw.mask = mask; |
| env->cc_op = (mask >> 13) & 3; |
| } |
| |
| static uint64_t get_psw_mask(CPUS390XState *env) |
| { |
| uint64_t r = env->psw.mask; |
| |
| env->cc_op = calc_cc(env, env->cc_op, env->cc_src, env->cc_dst, env->cc_vr); |
| |
| r &= ~(3ULL << 13); |
| assert(!(env->cc_op & ~3)); |
| r |= env->cc_op << 13; |
| |
| return r; |
| } |
| |
| static void do_svc_interrupt(CPUS390XState *env) |
| { |
| uint64_t mask, addr; |
| LowCore *lowcore; |
| hwaddr len = TARGET_PAGE_SIZE; |
| |
| lowcore = cpu_physical_memory_map(env->psa, &len, 1); |
| |
| lowcore->svc_code = cpu_to_be16(env->int_svc_code); |
| lowcore->svc_ilc = cpu_to_be16(env->int_svc_ilc); |
| lowcore->svc_old_psw.mask = cpu_to_be64(get_psw_mask(env)); |
| lowcore->svc_old_psw.addr = cpu_to_be64(env->psw.addr + (env->int_svc_ilc)); |
| mask = be64_to_cpu(lowcore->svc_new_psw.mask); |
| addr = be64_to_cpu(lowcore->svc_new_psw.addr); |
| |
| cpu_physical_memory_unmap(lowcore, len, 1, len); |
| |
| load_psw(env, mask, addr); |
| } |
| |
| static void do_program_interrupt(CPUS390XState *env) |
| { |
| uint64_t mask, addr; |
| LowCore *lowcore; |
| hwaddr len = TARGET_PAGE_SIZE; |
| int ilc = env->int_pgm_ilc; |
| |
| switch (ilc) { |
| case ILC_LATER: |
| ilc = get_ilc(cpu_ldub_code(env, env->psw.addr)); |
| break; |
| case ILC_LATER_INC: |
| ilc = get_ilc(cpu_ldub_code(env, env->psw.addr)); |
| env->psw.addr += ilc * 2; |
| break; |
| case ILC_LATER_INC_2: |
| ilc = get_ilc(cpu_ldub_code(env, env->psw.addr)) * 2; |
| env->psw.addr += ilc; |
| break; |
| } |
| |
| qemu_log_mask(CPU_LOG_INT, "%s: code=0x%x ilc=%d\n", |
| __func__, env->int_pgm_code, ilc); |
| |
| lowcore = cpu_physical_memory_map(env->psa, &len, 1); |
| |
| lowcore->pgm_ilc = cpu_to_be16(ilc); |
| lowcore->pgm_code = cpu_to_be16(env->int_pgm_code); |
| lowcore->program_old_psw.mask = cpu_to_be64(get_psw_mask(env)); |
| lowcore->program_old_psw.addr = cpu_to_be64(env->psw.addr); |
| mask = be64_to_cpu(lowcore->program_new_psw.mask); |
| addr = be64_to_cpu(lowcore->program_new_psw.addr); |
| |
| cpu_physical_memory_unmap(lowcore, len, 1, len); |
| |
| DPRINTF("%s: %x %x %" PRIx64 " %" PRIx64 "\n", __func__, |
| env->int_pgm_code, ilc, env->psw.mask, |
| env->psw.addr); |
| |
| load_psw(env, mask, addr); |
| } |
| |
| #define VIRTIO_SUBCODE_64 0x0D00 |
| |
| static void do_ext_interrupt(CPUS390XState *env) |
| { |
| uint64_t mask, addr; |
| LowCore *lowcore; |
| hwaddr len = TARGET_PAGE_SIZE; |
| ExtQueue *q; |
| |
| if (!(env->psw.mask & PSW_MASK_EXT)) { |
| cpu_abort(env, "Ext int w/o ext mask\n"); |
| } |
| |
| if (env->ext_index < 0 || env->ext_index > MAX_EXT_QUEUE) { |
| cpu_abort(env, "Ext queue overrun: %d\n", env->ext_index); |
| } |
| |
| q = &env->ext_queue[env->ext_index]; |
| lowcore = cpu_physical_memory_map(env->psa, &len, 1); |
| |
| lowcore->ext_int_code = cpu_to_be16(q->code); |
| lowcore->ext_params = cpu_to_be32(q->param); |
| lowcore->ext_params2 = cpu_to_be64(q->param64); |
| lowcore->external_old_psw.mask = cpu_to_be64(get_psw_mask(env)); |
| lowcore->external_old_psw.addr = cpu_to_be64(env->psw.addr); |
| lowcore->cpu_addr = cpu_to_be16(env->cpu_num | VIRTIO_SUBCODE_64); |
| mask = be64_to_cpu(lowcore->external_new_psw.mask); |
| addr = be64_to_cpu(lowcore->external_new_psw.addr); |
| |
| cpu_physical_memory_unmap(lowcore, len, 1, len); |
| |
| env->ext_index--; |
| if (env->ext_index == -1) { |
| env->pending_int &= ~INTERRUPT_EXT; |
| } |
| |
| DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__, |
| env->psw.mask, env->psw.addr); |
| |
| load_psw(env, mask, addr); |
| } |
| |
| void do_interrupt(CPUS390XState *env) |
| { |
| qemu_log_mask(CPU_LOG_INT, "%s: %d at pc=%" PRIx64 "\n", |
| __func__, env->exception_index, env->psw.addr); |
| |
| s390_add_running_cpu(env); |
| /* handle external interrupts */ |
| if ((env->psw.mask & PSW_MASK_EXT) && |
| env->exception_index == -1) { |
| if (env->pending_int & INTERRUPT_EXT) { |
| /* code is already in env */ |
| env->exception_index = EXCP_EXT; |
| } else if (env->pending_int & INTERRUPT_TOD) { |
| cpu_inject_ext(env, 0x1004, 0, 0); |
| env->exception_index = EXCP_EXT; |
| env->pending_int &= ~INTERRUPT_EXT; |
| env->pending_int &= ~INTERRUPT_TOD; |
| } else if (env->pending_int & INTERRUPT_CPUTIMER) { |
| cpu_inject_ext(env, 0x1005, 0, 0); |
| env->exception_index = EXCP_EXT; |
| env->pending_int &= ~INTERRUPT_EXT; |
| env->pending_int &= ~INTERRUPT_TOD; |
| } |
| } |
| |
| switch (env->exception_index) { |
| case EXCP_PGM: |
| do_program_interrupt(env); |
| break; |
| case EXCP_SVC: |
| do_svc_interrupt(env); |
| break; |
| case EXCP_EXT: |
| do_ext_interrupt(env); |
| break; |
| } |
| env->exception_index = -1; |
| |
| if (!env->pending_int) { |
| env->interrupt_request &= ~CPU_INTERRUPT_HARD; |
| } |
| } |
| |
| #endif /* CONFIG_USER_ONLY */ |
