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 "cpu.h"
  21 #include "exec/helper-proto.h"
  22 #include "exec/cpu_ldst.h"
  23
  24 /* Softmmu support */
  25 #ifndef CONFIG_USER_ONLY
  26
  27 uint64_t helper_ldl_phys(CPUAlphaState *env, uint64_t p)
  28 {
  29     CPUState *cs = CPU(alpha_env_get_cpu(env));
  30     return (int32_t)ldl_phys(cs->as, p);
  31 }
  32
  33 uint64_t helper_ldq_phys(CPUAlphaState *env, uint64_t p)
  34 {
  35     CPUState *cs = CPU(alpha_env_get_cpu(env));
  36     return ldq_phys(cs->as, p);
  37 }
  38
  39 uint64_t helper_ldl_l_phys(CPUAlphaState *env, uint64_t p)
  40 {
  41     CPUState *cs = CPU(alpha_env_get_cpu(env));
  42     env->lock_addr = p;
  43     return env->lock_value = (int32_t)ldl_phys(cs->as, p);
  44 }
  45
  46 uint64_t helper_ldq_l_phys(CPUAlphaState *env, uint64_t p)
  47 {
  48     CPUState *cs = CPU(alpha_env_get_cpu(env));
  49     env->lock_addr = p;
  50     return env->lock_value = ldq_phys(cs->as, p);
  51 }
  52
  53 void helper_stl_phys(CPUAlphaState *env, uint64_t p, uint64_t v)
  54 {
  55     CPUState *cs = CPU(alpha_env_get_cpu(env));
  56     stl_phys(cs->as, p, v);
  57 }
  58
  59 void helper_stq_phys(CPUAlphaState *env, uint64_t p, uint64_t v)
  60 {
  61     CPUState *cs = CPU(alpha_env_get_cpu(env));
  62     stq_phys(cs->as, p, v);
  63 }
  64
  65 uint64_t helper_stl_c_phys(CPUAlphaState *env, uint64_t p, uint64_t v)
  66 {
  67     CPUState *cs = CPU(alpha_env_get_cpu(env));
  68     uint64_t ret = 0;
  69
  70     if (p == env->lock_addr) {
  71         int32_t old = ldl_phys(cs->as, p);
  72         if (old == (int32_t)env->lock_value) {
  73             stl_phys(cs->as, p, v);
  74             ret = 1;
  75         }
  76     }
  77     env->lock_addr = -1;
  78
  79     return ret;
  80 }
  81
  82 uint64_t helper_stq_c_phys(CPUAlphaState *env, uint64_t p, uint64_t v)
  83 {
  84     CPUState *cs = CPU(alpha_env_get_cpu(env));
  85     uint64_t ret = 0;
  86
  87     if (p == env->lock_addr) {
  88         uint64_t old = ldq_phys(cs->as, p);
  89         if (old == env->lock_value) {
  90             stq_phys(cs->as, p, v);
  91             ret = 1;
  92         }
  93     }
  94     env->lock_addr = -1;
  95
  96     return ret;
  97 }
  98
  99 void alpha_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
 100                                    int is_write, int is_user, uintptr_t retaddr)
 101 {
 102     AlphaCPU *cpu = ALPHA_CPU(cs);
 103     CPUAlphaState *env = &cpu->env;
 104     uint64_t pc;
 105     uint32_t insn;
 106
 107     if (retaddr) {
 108         cpu_restore_state(cs, retaddr);
 109     }
 110
 111     pc = env->pc;
 112     insn = cpu_ldl_code(env, pc);
 113
 114     env->trap_arg0 = addr;
 115     env->trap_arg1 = insn >> 26;                /* opcode */
 116     env->trap_arg2 = (insn >> 21) & 31;         /* dest regno */
 117     cs->exception_index = EXCP_UNALIGN;
 118     env->error_code = 0;
 119     cpu_loop_exit(cs);
 120 }
 121
 122 void alpha_cpu_unassigned_access(CPUState *cs, hwaddr addr,
 123                                  bool is_write, bool is_exec, int unused,
 124                                  unsigned size)
 125 {
 126     AlphaCPU *cpu = ALPHA_CPU(cs);
 127     CPUAlphaState *env = &cpu->env;
 128
 129     env->trap_arg0 = addr;
 130     env->trap_arg1 = is_write ? 1 : 0;
 131     cs->exception_index = EXCP_MCHK;
 132     env->error_code = 0;
 133
 134     /* ??? We should cpu_restore_state to the faulting insn, but this hook
 135        does not have access to the retaddr value from the orignal helper.
 136        It's all moot until the QEMU PALcode grows an MCHK handler.  */
 137
 138     cpu_loop_exit(cs);
 139 }
 140
 141 /* try to fill the TLB and return an exception if error. If retaddr is
 142    NULL, it means that the function was called in C code (i.e. not
 143    from generated code or from helper.c) */
 144 /* XXX: fix it to restore all registers */
 145 void tlb_fill(CPUState *cs, target_ulong addr, int is_write,
 146               int mmu_idx, uintptr_t retaddr)
 147 {
 148     int ret;
 149
 150     ret = alpha_cpu_handle_mmu_fault(cs, addr, is_write, mmu_idx);
 151     if (unlikely(ret != 0)) {
 152         if (retaddr) {
 153             cpu_restore_state(cs, retaddr);
 154         }
 155         /* Exception index and error code are already set */
 156         cpu_loop_exit(cs);
 157     }
 158 }
 159 #endif /* CONFIG_USER_ONLY */