target/alpha/mem_helper.c

   1 /*
   2  *  Helpers for loads and stores
   3  *
   4  *  Copyright (c) 2007 Jocelyn Mayer
   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/helper-proto.h"
  23 #include "exec/exec-all.h"
  24 #include "exec/cpu_ldst.h"
  25
  26 /* Softmmu support */
  27 #ifndef CONFIG_USER_ONLY
  28 void alpha_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
  29                                    MMUAccessType access_type,
  30                                    int mmu_idx, uintptr_t retaddr)
  31 {
  32     AlphaCPU *cpu = ALPHA_CPU(cs);
  33     CPUAlphaState *env = &cpu->env;
  34     uint64_t pc;
  35     uint32_t insn;
  36
  37     if (retaddr) {
  38         cpu_restore_state(cs, retaddr);
  39     }
  40
  41     pc = env->pc;
  42     insn = cpu_ldl_code(env, pc);
  43
  44     env->trap_arg0 = addr;
  45     env->trap_arg1 = insn >> 26;                /* opcode */
  46     env->trap_arg2 = (insn >> 21) & 31;         /* dest regno */
  47     cs->exception_index = EXCP_UNALIGN;
  48     env->error_code = 0;
  49     cpu_loop_exit(cs);
  50 }
  51
  52 void alpha_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
  53                                      vaddr addr, unsigned size,
  54                                      MMUAccessType access_type,
  55                                      int mmu_idx, MemTxAttrs attrs,
  56                                      MemTxResult response, uintptr_t retaddr)
  57 {
  58     AlphaCPU *cpu = ALPHA_CPU(cs);
  59     CPUAlphaState *env = &cpu->env;
  60
  61     if (retaddr) {
  62         cpu_restore_state(cs, retaddr);
  63     }
  64
  65     env->trap_arg0 = addr;
  66     env->trap_arg1 = access_type == MMU_DATA_STORE ? 1 : 0;
  67     cs->exception_index = EXCP_MCHK;
  68     env->error_code = 0;
  69     cpu_loop_exit(cs);
  70 }
  71
  72 /* try to fill the TLB and return an exception if error. If retaddr is
  73    NULL, it means that the function was called in C code (i.e. not
  74    from generated code or from helper.c) */
  75 /* XXX: fix it to restore all registers */
  76 void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
  77               int mmu_idx, uintptr_t retaddr)
  78 {
  79     int ret;
  80
  81     ret = alpha_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx);
  82     if (unlikely(ret != 0)) {
  83         if (retaddr) {
  84             cpu_restore_state(cs, retaddr);
  85         }
  86         /* Exception index and error code are already set */
  87         cpu_loop_exit(cs);
  88     }
  89 }
  90 #endif /* CONFIG_USER_ONLY */