target/hppa/cpu.c

   1 /*
   2  * QEMU HPPA CPU
   3  *
   4  * Copyright (c) 2016 Richard Henderson <rth@twiddle.net>
   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 2.1 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
  17  * License along with this library; if not, see
  18  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "qapi/error.h"
  23 #include "qemu/qemu-print.h"
  24 #include "qemu/timer.h"
  25 #include "cpu.h"
  26 #include "qemu/module.h"
  27 #include "exec/exec-all.h"
  28 #include "fpu/softfloat.h"
  29 #include "tcg/tcg.h"
  30
  31 static void hppa_cpu_set_pc(CPUState *cs, vaddr value)
  32 {
  33     HPPACPU *cpu = HPPA_CPU(cs);
  34
  35     cpu->env.iaoq_f = value;
  36     cpu->env.iaoq_b = value + 4;
  37 }
  38
  39 static vaddr hppa_cpu_get_pc(CPUState *cs)
  40 {
  41     HPPACPU *cpu = HPPA_CPU(cs);
  42
  43     return cpu->env.iaoq_f;
  44 }
  45
  46 static void hppa_cpu_synchronize_from_tb(CPUState *cs,
  47                                          const TranslationBlock *tb)
  48 {
  49     HPPACPU *cpu = HPPA_CPU(cs);
  50
  51     tcg_debug_assert(!(cs->tcg_cflags & CF_PCREL));
  52
  53 #ifdef CONFIG_USER_ONLY
  54     cpu->env.iaoq_f = tb->pc;
  55     cpu->env.iaoq_b = tb->cs_base;
  56 #else
  57     /* Recover the IAOQ values from the GVA + PRIV.  */
  58     uint32_t priv = (tb->flags >> TB_FLAG_PRIV_SHIFT) & 3;
  59     target_ulong cs_base = tb->cs_base;
  60     target_ulong iasq_f = cs_base & ~0xffffffffull;
  61     int32_t diff = cs_base;
  62
  63     cpu->env.iasq_f = iasq_f;
  64     cpu->env.iaoq_f = (tb->pc & ~iasq_f) + priv;
  65     if (diff) {
  66         cpu->env.iaoq_b = cpu->env.iaoq_f + diff;
  67     }
  68 #endif
  69
  70     cpu->env.psw_n = (tb->flags & PSW_N) != 0;
  71 }
  72
  73 static void hppa_restore_state_to_opc(CPUState *cs,
  74                                       const TranslationBlock *tb,
  75                                       const uint64_t *data)
  76 {
  77     HPPACPU *cpu = HPPA_CPU(cs);
  78
  79     cpu->env.iaoq_f = data[0];
  80     if (data[1] != (target_ureg)-1) {
  81         cpu->env.iaoq_b = data[1];
  82     }
  83     /*
  84      * Since we were executing the instruction at IAOQ_F, and took some
  85      * sort of action that provoked the cpu_restore_state, we can infer
  86      * that the instruction was not nullified.
  87      */
  88     cpu->env.psw_n = 0;
  89 }
  90
  91 static bool hppa_cpu_has_work(CPUState *cs)
  92 {
  93     return cs->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_NMI);
  94 }
  95
  96 static void hppa_cpu_disas_set_info(CPUState *cs, disassemble_info *info)
  97 {
  98     info->mach = bfd_mach_hppa20;
  99     info->print_insn = print_insn_hppa;
 100 }
 101
 102 #ifndef CONFIG_USER_ONLY
 103 static G_NORETURN
 104 void hppa_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
 105                                   MMUAccessType access_type, int mmu_idx,
 106                                   uintptr_t retaddr)
 107 {
 108     HPPACPU *cpu = HPPA_CPU(cs);
 109     CPUHPPAState *env = &cpu->env;
 110
 111     cs->exception_index = EXCP_UNALIGN;
 112     if (env->psw & PSW_Q) {
 113         /* ??? Needs tweaking for hppa64.  */
 114         env->cr[CR_IOR] = addr;
 115         env->cr[CR_ISR] = addr >> 32;
 116     }
 117
 118     cpu_loop_exit_restore(cs, retaddr);
 119 }
 120 #endif /* CONFIG_USER_ONLY */
 121
 122 static void hppa_cpu_realizefn(DeviceState *dev, Error **errp)
 123 {
 124     CPUState *cs = CPU(dev);
 125     HPPACPUClass *acc = HPPA_CPU_GET_CLASS(dev);
 126     Error *local_err = NULL;
 127
 128     cpu_exec_realizefn(cs, &local_err);
 129     if (local_err != NULL) {
 130         error_propagate(errp, local_err);
 131         return;
 132     }
 133
 134     qemu_init_vcpu(cs);
 135     acc->parent_realize(dev, errp);
 136
 137 #ifndef CONFIG_USER_ONLY
 138     {
 139         HPPACPU *cpu = HPPA_CPU(cs);
 140
 141         cpu->alarm_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
 142                                         hppa_cpu_alarm_timer, cpu);
 143         hppa_ptlbe(&cpu->env);
 144     }
 145 #endif
 146 }
 147
 148 static void hppa_cpu_initfn(Object *obj)
 149 {
 150     CPUState *cs = CPU(obj);
 151     HPPACPU *cpu = HPPA_CPU(obj);
 152     CPUHPPAState *env = &cpu->env;
 153
 154     cs->exception_index = -1;
 155     cpu_hppa_loaded_fr0(env);
 156     cpu_hppa_put_psw(env, PSW_W);
 157 }
 158
 159 static ObjectClass *hppa_cpu_class_by_name(const char *cpu_model)
 160 {
 161     return object_class_by_name(TYPE_HPPA_CPU);
 162 }
 163
 164 #ifndef CONFIG_USER_ONLY
 165 #include "hw/core/sysemu-cpu-ops.h"
 166
 167 static const struct SysemuCPUOps hppa_sysemu_ops = {
 168     .get_phys_page_debug = hppa_cpu_get_phys_page_debug,
 169 };
 170 #endif
 171
 172 #include "hw/core/tcg-cpu-ops.h"
 173
 174 static const struct TCGCPUOps hppa_tcg_ops = {
 175     .initialize = hppa_translate_init,
 176     .synchronize_from_tb = hppa_cpu_synchronize_from_tb,
 177     .restore_state_to_opc = hppa_restore_state_to_opc,
 178
 179 #ifndef CONFIG_USER_ONLY
 180     .tlb_fill = hppa_cpu_tlb_fill,
 181     .cpu_exec_interrupt = hppa_cpu_exec_interrupt,
 182     .do_interrupt = hppa_cpu_do_interrupt,
 183     .do_unaligned_access = hppa_cpu_do_unaligned_access,
 184 #endif /* !CONFIG_USER_ONLY */
 185 };
 186
 187 static void hppa_cpu_class_init(ObjectClass *oc, void *data)
 188 {
 189     DeviceClass *dc = DEVICE_CLASS(oc);
 190     CPUClass *cc = CPU_CLASS(oc);
 191     HPPACPUClass *acc = HPPA_CPU_CLASS(oc);
 192
 193     device_class_set_parent_realize(dc, hppa_cpu_realizefn,
 194                                     &acc->parent_realize);
 195
 196     cc->class_by_name = hppa_cpu_class_by_name;
 197     cc->has_work = hppa_cpu_has_work;
 198     cc->dump_state = hppa_cpu_dump_state;
 199     cc->set_pc = hppa_cpu_set_pc;
 200     cc->get_pc = hppa_cpu_get_pc;
 201     cc->gdb_read_register = hppa_cpu_gdb_read_register;
 202     cc->gdb_write_register = hppa_cpu_gdb_write_register;
 203 #ifndef CONFIG_USER_ONLY
 204     dc->vmsd = &vmstate_hppa_cpu;
 205     cc->sysemu_ops = &hppa_sysemu_ops;
 206 #endif
 207     cc->disas_set_info = hppa_cpu_disas_set_info;
 208     cc->gdb_num_core_regs = 128;
 209     cc->tcg_ops = &hppa_tcg_ops;
 210 }
 211
 212 static const TypeInfo hppa_cpu_type_info = {
 213     .name = TYPE_HPPA_CPU,
 214     .parent = TYPE_CPU,
 215     .instance_size = sizeof(HPPACPU),
 216     .instance_align = __alignof(HPPACPU),
 217     .instance_init = hppa_cpu_initfn,
 218     .abstract = false,
 219     .class_size = sizeof(HPPACPUClass),
 220     .class_init = hppa_cpu_class_init,
 221 };
 222
 223 static void hppa_cpu_register_types(void)
 224 {
 225     type_register_static(&hppa_cpu_type_info);
 226 }
 227
 228 type_init(hppa_cpu_register_types)