target/lm32/helper.c

   1 /*
   2  *  LatticeMico32 helper routines.
   3  *
   4  *  Copyright (c) 2010-2014 Michael Walle <michael@walle.cc>
   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 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 <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "cpu.h"
  22 #include "exec/exec-all.h"
  23 #include "qemu/host-utils.h"
  24 #include "sysemu/sysemu.h"
  25 #include "exec/semihost.h"
  26 #include "exec/log.h"
  27
  28 int lm32_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
  29                               int mmu_idx)
  30 {
  31     LM32CPU *cpu = LM32_CPU(cs);
  32     CPULM32State *env = &cpu->env;
  33     int prot;
  34
  35     address &= TARGET_PAGE_MASK;
  36     prot = PAGE_BITS;
  37     if (env->flags & LM32_FLAG_IGNORE_MSB) {
  38         tlb_set_page(cs, address, address & 0x7fffffff, prot, mmu_idx,
  39                      TARGET_PAGE_SIZE);
  40     } else {
  41         tlb_set_page(cs, address, address, prot, mmu_idx, TARGET_PAGE_SIZE);
  42     }
  43
  44     return 0;
  45 }
  46
  47 hwaddr lm32_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
  48 {
  49     LM32CPU *cpu = LM32_CPU(cs);
  50
  51     addr &= TARGET_PAGE_MASK;
  52     if (cpu->env.flags & LM32_FLAG_IGNORE_MSB) {
  53         return addr & 0x7fffffff;
  54     } else {
  55         return addr;
  56     }
  57 }
  58
  59 void lm32_breakpoint_insert(CPULM32State *env, int idx, target_ulong address)
  60 {
  61     LM32CPU *cpu = lm32_env_get_cpu(env);
  62
  63     cpu_breakpoint_insert(CPU(cpu), address, BP_CPU,
  64                           &env->cpu_breakpoint[idx]);
  65 }
  66
  67 void lm32_breakpoint_remove(CPULM32State *env, int idx)
  68 {
  69     LM32CPU *cpu = lm32_env_get_cpu(env);
  70
  71     if (!env->cpu_breakpoint[idx]) {
  72         return;
  73     }
  74
  75     cpu_breakpoint_remove_by_ref(CPU(cpu), env->cpu_breakpoint[idx]);
  76     env->cpu_breakpoint[idx] = NULL;
  77 }
  78
  79 void lm32_watchpoint_insert(CPULM32State *env, int idx, target_ulong address,
  80                             lm32_wp_t wp_type)
  81 {
  82     LM32CPU *cpu = lm32_env_get_cpu(env);
  83     int flags = 0;
  84
  85     switch (wp_type) {
  86     case LM32_WP_DISABLED:
  87         /* nothing to do */
  88         break;
  89     case LM32_WP_READ:
  90         flags = BP_CPU | BP_STOP_BEFORE_ACCESS | BP_MEM_READ;
  91         break;
  92     case LM32_WP_WRITE:
  93         flags = BP_CPU | BP_STOP_BEFORE_ACCESS | BP_MEM_WRITE;
  94         break;
  95     case LM32_WP_READ_WRITE:
  96         flags = BP_CPU | BP_STOP_BEFORE_ACCESS | BP_MEM_ACCESS;
  97         break;
  98     }
  99
 100     if (flags != 0) {
 101         cpu_watchpoint_insert(CPU(cpu), address, 1, flags,
 102                 &env->cpu_watchpoint[idx]);
 103     }
 104 }
 105
 106 void lm32_watchpoint_remove(CPULM32State *env, int idx)
 107 {
 108     LM32CPU *cpu = lm32_env_get_cpu(env);
 109
 110     if (!env->cpu_watchpoint[idx]) {
 111         return;
 112     }
 113
 114     cpu_watchpoint_remove_by_ref(CPU(cpu), env->cpu_watchpoint[idx]);
 115     env->cpu_watchpoint[idx] = NULL;
 116 }
 117
 118 static bool check_watchpoints(CPULM32State *env)
 119 {
 120     LM32CPU *cpu = lm32_env_get_cpu(env);
 121     int i;
 122
 123     for (i = 0; i < cpu->num_watchpoints; i++) {
 124         if (env->cpu_watchpoint[i] &&
 125                 env->cpu_watchpoint[i]->flags & BP_WATCHPOINT_HIT) {
 126             return true;
 127         }
 128     }
 129     return false;
 130 }
 131
 132 void lm32_debug_excp_handler(CPUState *cs)
 133 {
 134     LM32CPU *cpu = LM32_CPU(cs);
 135     CPULM32State *env = &cpu->env;
 136     CPUBreakpoint *bp;
 137
 138     if (cs->watchpoint_hit) {
 139         if (cs->watchpoint_hit->flags & BP_CPU) {
 140             cs->watchpoint_hit = NULL;
 141             if (check_watchpoints(env)) {
 142                 raise_exception(env, EXCP_WATCHPOINT);
 143             } else {
 144                 cpu_loop_exit_noexc(cs);
 145             }
 146         }
 147     } else {
 148         QTAILQ_FOREACH(bp, &cs->breakpoints, entry) {
 149             if (bp->pc == env->pc) {
 150                 if (bp->flags & BP_CPU) {
 151                     raise_exception(env, EXCP_BREAKPOINT);
 152                 }
 153                 break;
 154             }
 155         }
 156     }
 157 }
 158
 159 void lm32_cpu_do_interrupt(CPUState *cs)
 160 {
 161     LM32CPU *cpu = LM32_CPU(cs);
 162     CPULM32State *env = &cpu->env;
 163
 164     qemu_log_mask(CPU_LOG_INT,
 165             "exception at pc=%x type=%x\n", env->pc, cs->exception_index);
 166
 167     switch (cs->exception_index) {
 168     case EXCP_SYSTEMCALL:
 169         if (unlikely(semihosting_enabled())) {
 170             /* do_semicall() returns true if call was handled. Otherwise
 171              * do the normal exception handling. */
 172             if (lm32_cpu_do_semihosting(cs)) {
 173                 env->pc += 4;
 174                 break;
 175             }
 176         }
 177         /* fall through */
 178     case EXCP_INSN_BUS_ERROR:
 179     case EXCP_DATA_BUS_ERROR:
 180     case EXCP_DIVIDE_BY_ZERO:
 181     case EXCP_IRQ:
 182         /* non-debug exceptions */
 183         env->regs[R_EA] = env->pc;
 184         env->ie |= (env->ie & IE_IE) ? IE_EIE : 0;
 185         env->ie &= ~IE_IE;
 186         if (env->dc & DC_RE) {
 187             env->pc = env->deba + (cs->exception_index * 32);
 188         } else {
 189             env->pc = env->eba + (cs->exception_index * 32);
 190         }
 191         log_cpu_state_mask(CPU_LOG_INT, cs, 0);
 192         break;
 193     case EXCP_BREAKPOINT:
 194     case EXCP_WATCHPOINT:
 195         /* debug exceptions */
 196         env->regs[R_BA] = env->pc;
 197         env->ie |= (env->ie & IE_IE) ? IE_BIE : 0;
 198         env->ie &= ~IE_IE;
 199         env->pc = env->deba + (cs->exception_index * 32);
 200         log_cpu_state_mask(CPU_LOG_INT, cs, 0);
 201         break;
 202     default:
 203         cpu_abort(cs, "unhandled exception type=%d\n",
 204                   cs->exception_index);
 205         break;
 206     }
 207 }
 208
 209 bool lm32_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 210 {
 211     LM32CPU *cpu = LM32_CPU(cs);
 212     CPULM32State *env = &cpu->env;
 213
 214     if ((interrupt_request & CPU_INTERRUPT_HARD) && (env->ie & IE_IE)) {
 215         cs->exception_index = EXCP_IRQ;
 216         lm32_cpu_do_interrupt(cs);
 217         return true;
 218     }
 219     return false;
 220 }
 221
 222 /* Some soc ignores the MSB on the address bus. Thus creating a shadow memory
 223  * area. As a general rule, 0x00000000-0x7fffffff is cached, whereas
 224  * 0x80000000-0xffffffff is not cached and used to access IO devices. */
 225 void cpu_lm32_set_phys_msb_ignore(CPULM32State *env, int value)
 226 {
 227     if (value) {
 228         env->flags |= LM32_FLAG_IGNORE_MSB;
 229     } else {
 230         env->flags &= ~LM32_FLAG_IGNORE_MSB;
 231     }
 232 }