accel/tcg/tcg-accel-ops.c

   1 /*
   2  * QEMU TCG vCPU common functionality
   3  *
   4  * Functionality common to all TCG vCPU variants: mttcg, rr and icount.
   5  *
   6  * Copyright (c) 2003-2008 Fabrice Bellard
   7  * Copyright (c) 2014 Red Hat Inc.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "sysemu/tcg.h"
  30 #include "sysemu/replay.h"
  31 #include "sysemu/cpu-timers.h"
  32 #include "qemu/main-loop.h"
  33 #include "qemu/guest-random.h"
  34 #include "qemu/timer.h"
  35 #include "exec/exec-all.h"
  36 #include "exec/hwaddr.h"
  37 #include "exec/gdbstub.h"
  38
  39 #include "tcg-accel-ops.h"
  40 #include "tcg-accel-ops-mttcg.h"
  41 #include "tcg-accel-ops-rr.h"
  42 #include "tcg-accel-ops-icount.h"
  43
  44 /* common functionality among all TCG variants */
  45
  46 void tcg_cpu_init_cflags(CPUState *cpu, bool parallel)
  47 {
  48     uint32_t cflags;
  49
  50     /*
  51      * Include the cluster number in the hash we use to look up TBs.
  52      * This is important because a TB that is valid for one cluster at
  53      * a given physical address and set of CPU flags is not necessarily
  54      * valid for another:
  55      * the two clusters may have different views of physical memory, or
  56      * may have different CPU features (eg FPU present or absent).
  57      */
  58     cflags = cpu->cluster_index << CF_CLUSTER_SHIFT;
  59
  60     cflags |= parallel ? CF_PARALLEL : 0;
  61     cflags |= icount_enabled() ? CF_USE_ICOUNT : 0;
  62     cpu->tcg_cflags |= cflags;
  63 }
  64
  65 void tcg_cpus_destroy(CPUState *cpu)
  66 {
  67     cpu_thread_signal_destroyed(cpu);
  68 }
  69
  70 int tcg_cpus_exec(CPUState *cpu)
  71 {
  72     int ret;
  73 #ifdef CONFIG_PROFILER
  74     int64_t ti;
  75 #endif
  76     assert(tcg_enabled());
  77 #ifdef CONFIG_PROFILER
  78     ti = profile_getclock();
  79 #endif
  80     cpu_exec_start(cpu);
  81     ret = cpu_exec(cpu);
  82     cpu_exec_end(cpu);
  83 #ifdef CONFIG_PROFILER
  84     qatomic_set(&tcg_ctx->prof.cpu_exec_time,
  85                 tcg_ctx->prof.cpu_exec_time + profile_getclock() - ti);
  86 #endif
  87     return ret;
  88 }
  89
  90 /* mask must never be zero, except for A20 change call */
  91 void tcg_handle_interrupt(CPUState *cpu, int mask)
  92 {
  93     g_assert(qemu_mutex_iothread_locked());
  94
  95     cpu->interrupt_request |= mask;
  96
  97     /*
  98      * If called from iothread context, wake the target cpu in
  99      * case its halted.
 100      */
 101     if (!qemu_cpu_is_self(cpu)) {
 102         qemu_cpu_kick(cpu);
 103     } else {
 104         qatomic_set(&cpu_neg(cpu)->icount_decr.u16.high, -1);
 105     }
 106 }
 107
 108 static bool tcg_supports_guest_debug(void)
 109 {
 110     return true;
 111 }
 112
 113 /* Translate GDB watchpoint type to a flags value for cpu_watchpoint_* */
 114 static inline int xlat_gdb_type(CPUState *cpu, int gdbtype)
 115 {
 116     static const int xlat[] = {
 117         [GDB_WATCHPOINT_WRITE]  = BP_GDB | BP_MEM_WRITE,
 118         [GDB_WATCHPOINT_READ]   = BP_GDB | BP_MEM_READ,
 119         [GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS,
 120     };
 121
 122     CPUClass *cc = CPU_GET_CLASS(cpu);
 123     int cputype = xlat[gdbtype];
 124
 125     if (cc->gdb_stop_before_watchpoint) {
 126         cputype |= BP_STOP_BEFORE_ACCESS;
 127     }
 128     return cputype;
 129 }
 130
 131 static int tcg_insert_breakpoint(CPUState *cs, int type, vaddr addr, vaddr len)
 132 {
 133     CPUState *cpu;
 134     int err = 0;
 135
 136     switch (type) {
 137     case GDB_BREAKPOINT_SW:
 138     case GDB_BREAKPOINT_HW:
 139         CPU_FOREACH(cpu) {
 140             err = cpu_breakpoint_insert(cpu, addr, BP_GDB, NULL);
 141             if (err) {
 142                 break;
 143             }
 144         }
 145         return err;
 146     case GDB_WATCHPOINT_WRITE:
 147     case GDB_WATCHPOINT_READ:
 148     case GDB_WATCHPOINT_ACCESS:
 149         CPU_FOREACH(cpu) {
 150             err = cpu_watchpoint_insert(cpu, addr, len,
 151                                         xlat_gdb_type(cpu, type), NULL);
 152             if (err) {
 153                 break;
 154             }
 155         }
 156         return err;
 157     default:
 158         return -ENOSYS;
 159     }
 160 }
 161
 162 static int tcg_remove_breakpoint(CPUState *cs, int type, vaddr addr, vaddr len)
 163 {
 164     CPUState *cpu;
 165     int err = 0;
 166
 167     switch (type) {
 168     case GDB_BREAKPOINT_SW:
 169     case GDB_BREAKPOINT_HW:
 170         CPU_FOREACH(cpu) {
 171             err = cpu_breakpoint_remove(cpu, addr, BP_GDB);
 172             if (err) {
 173                 break;
 174             }
 175         }
 176         return err;
 177     case GDB_WATCHPOINT_WRITE:
 178     case GDB_WATCHPOINT_READ:
 179     case GDB_WATCHPOINT_ACCESS:
 180         CPU_FOREACH(cpu) {
 181             err = cpu_watchpoint_remove(cpu, addr, len,
 182                                         xlat_gdb_type(cpu, type));
 183             if (err) {
 184                 break;
 185             }
 186         }
 187         return err;
 188     default:
 189         return -ENOSYS;
 190     }
 191 }
 192
 193 static inline void tcg_remove_all_breakpoints(CPUState *cpu)
 194 {
 195     cpu_breakpoint_remove_all(cpu, BP_GDB);
 196     cpu_watchpoint_remove_all(cpu, BP_GDB);
 197 }
 198
 199 static void tcg_accel_ops_init(AccelOpsClass *ops)
 200 {
 201     if (qemu_tcg_mttcg_enabled()) {
 202         ops->create_vcpu_thread = mttcg_start_vcpu_thread;
 203         ops->kick_vcpu_thread = mttcg_kick_vcpu_thread;
 204         ops->handle_interrupt = tcg_handle_interrupt;
 205     } else {
 206         ops->create_vcpu_thread = rr_start_vcpu_thread;
 207         ops->kick_vcpu_thread = rr_kick_vcpu_thread;
 208
 209         if (icount_enabled()) {
 210             ops->handle_interrupt = icount_handle_interrupt;
 211             ops->get_virtual_clock = icount_get;
 212             ops->get_elapsed_ticks = icount_get;
 213         } else {
 214             ops->handle_interrupt = tcg_handle_interrupt;
 215         }
 216     }
 217
 218     ops->supports_guest_debug = tcg_supports_guest_debug;
 219     ops->insert_breakpoint = tcg_insert_breakpoint;
 220     ops->remove_breakpoint = tcg_remove_breakpoint;
 221     ops->remove_all_breakpoints = tcg_remove_all_breakpoints;
 222 }
 223
 224 static void tcg_accel_ops_class_init(ObjectClass *oc, void *data)
 225 {
 226     AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
 227
 228     ops->ops_init = tcg_accel_ops_init;
 229 }
 230
 231 static const TypeInfo tcg_accel_ops_type = {
 232     .name = ACCEL_OPS_NAME("tcg"),
 233
 234     .parent = TYPE_ACCEL_OPS,
 235     .class_init = tcg_accel_ops_class_init,
 236     .abstract = true,
 237 };
 238 module_obj(ACCEL_OPS_NAME("tcg"));
 239
 240 static void tcg_accel_ops_register_types(void)
 241 {
 242     type_register_static(&tcg_accel_ops_type);
 243 }
 244 type_init(tcg_accel_ops_register_types);