target-unicore32/op_helper.c

   1 /*
   2  *  UniCore32 helper routines
   3  *
   4  * Copyright (C) 2010-2012 Guan Xuetao
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation, or (at your option) any
   9  * later version. See the COPYING file in the top-level directory.
  10  */
  11 #include "cpu.h"
  12 #include "helper.h"
  13
  14 #define SIGNBIT (uint32_t)0x80000000
  15 #define SIGNBIT64 ((uint64_t)1 << 63)
  16
  17 void HELPER(exception)(CPUUniCore32State *env, uint32_t excp)
  18 {
  19     CPUState *cs = CPU(uc32_env_get_cpu(env));
  20
  21     cs->exception_index = excp;
  22     cpu_loop_exit(cs);
  23 }
  24
  25 static target_ulong asr_read(CPUUniCore32State *env)
  26 {
  27     int ZF;
  28     ZF = (env->ZF == 0);
  29     return env->uncached_asr | (env->NF & 0x80000000) | (ZF << 30) |
  30         (env->CF << 29) | ((env->VF & 0x80000000) >> 3);
  31 }
  32
  33 target_ulong cpu_asr_read(CPUUniCore32State *env)
  34 {
  35     return asr_read(env);
  36 }
  37
  38 target_ulong HELPER(asr_read)(CPUUniCore32State *env)
  39 {
  40     return asr_read(env);
  41 }
  42
  43 static void asr_write(CPUUniCore32State *env, target_ulong val,
  44                       target_ulong mask)
  45 {
  46     if (mask & ASR_NZCV) {
  47         env->ZF = (~val) & ASR_Z;
  48         env->NF = val;
  49         env->CF = (val >> 29) & 1;
  50         env->VF = (val << 3) & 0x80000000;
  51     }
  52
  53     if ((env->uncached_asr ^ val) & mask & ASR_M) {
  54         switch_mode(env, val & ASR_M);
  55     }
  56     mask &= ~ASR_NZCV;
  57     env->uncached_asr = (env->uncached_asr & ~mask) | (val & mask);
  58 }
  59
  60 void cpu_asr_write(CPUUniCore32State *env, target_ulong val, target_ulong mask)
  61 {
  62     asr_write(env, val, mask);
  63 }
  64
  65 void HELPER(asr_write)(CPUUniCore32State *env, target_ulong val,
  66                        target_ulong mask)
  67 {
  68     asr_write(env, val, mask);
  69 }
  70
  71 /* Access to user mode registers from privileged modes.  */
  72 uint32_t HELPER(get_user_reg)(CPUUniCore32State *env, uint32_t regno)
  73 {
  74     uint32_t val;
  75
  76     if (regno == 29) {
  77         val = env->banked_r29[0];
  78     } else if (regno == 30) {
  79         val = env->banked_r30[0];
  80     } else {
  81         val = env->regs[regno];
  82     }
  83     return val;
  84 }
  85
  86 void HELPER(set_user_reg)(CPUUniCore32State *env, uint32_t regno, uint32_t val)
  87 {
  88     if (regno == 29) {
  89         env->banked_r29[0] = val;
  90     } else if (regno == 30) {
  91         env->banked_r30[0] = val;
  92     } else {
  93         env->regs[regno] = val;
  94     }
  95 }
  96
  97 /* ??? Flag setting arithmetic is awkward because we need to do comparisons.
  98    The only way to do that in TCG is a conditional branch, which clobbers
  99    all our temporaries.  For now implement these as helper functions.  */
 100
 101 uint32_t HELPER(add_cc)(CPUUniCore32State *env, uint32_t a, uint32_t b)
 102 {
 103     uint32_t result;
 104     result = a + b;
 105     env->NF = env->ZF = result;
 106     env->CF = result < a;
 107     env->VF = (a ^ b ^ -1) & (a ^ result);
 108     return result;
 109 }
 110
 111 uint32_t HELPER(adc_cc)(CPUUniCore32State *env, uint32_t a, uint32_t b)
 112 {
 113     uint32_t result;
 114     if (!env->CF) {
 115         result = a + b;
 116         env->CF = result < a;
 117     } else {
 118         result = a + b + 1;
 119         env->CF = result <= a;
 120     }
 121     env->VF = (a ^ b ^ -1) & (a ^ result);
 122     env->NF = env->ZF = result;
 123     return result;
 124 }
 125
 126 uint32_t HELPER(sub_cc)(CPUUniCore32State *env, uint32_t a, uint32_t b)
 127 {
 128     uint32_t result;
 129     result = a - b;
 130     env->NF = env->ZF = result;
 131     env->CF = a >= b;
 132     env->VF = (a ^ b) & (a ^ result);
 133     return result;
 134 }
 135
 136 uint32_t HELPER(sbc_cc)(CPUUniCore32State *env, uint32_t a, uint32_t b)
 137 {
 138     uint32_t result;
 139     if (!env->CF) {
 140         result = a - b - 1;
 141         env->CF = a > b;
 142     } else {
 143         result = a - b;
 144         env->CF = a >= b;
 145     }
 146     env->VF = (a ^ b) & (a ^ result);
 147     env->NF = env->ZF = result;
 148     return result;
 149 }
 150
 151 /* Similarly for variable shift instructions.  */
 152
 153 uint32_t HELPER(shl)(uint32_t x, uint32_t i)
 154 {
 155     int shift = i & 0xff;
 156     if (shift >= 32) {
 157         return 0;
 158     }
 159     return x << shift;
 160 }
 161
 162 uint32_t HELPER(shr)(uint32_t x, uint32_t i)
 163 {
 164     int shift = i & 0xff;
 165     if (shift >= 32) {
 166         return 0;
 167     }
 168     return (uint32_t)x >> shift;
 169 }
 170
 171 uint32_t HELPER(sar)(uint32_t x, uint32_t i)
 172 {
 173     int shift = i & 0xff;
 174     if (shift >= 32) {
 175         shift = 31;
 176     }
 177     return (int32_t)x >> shift;
 178 }
 179
 180 uint32_t HELPER(shl_cc)(CPUUniCore32State *env, uint32_t x, uint32_t i)
 181 {
 182     int shift = i & 0xff;
 183     if (shift >= 32) {
 184         if (shift == 32) {
 185             env->CF = x & 1;
 186         } else {
 187             env->CF = 0;
 188         }
 189         return 0;
 190     } else if (shift != 0) {
 191         env->CF = (x >> (32 - shift)) & 1;
 192         return x << shift;
 193     }
 194     return x;
 195 }
 196
 197 uint32_t HELPER(shr_cc)(CPUUniCore32State *env, uint32_t x, uint32_t i)
 198 {
 199     int shift = i & 0xff;
 200     if (shift >= 32) {
 201         if (shift == 32) {
 202             env->CF = (x >> 31) & 1;
 203         } else {
 204             env->CF = 0;
 205         }
 206         return 0;
 207     } else if (shift != 0) {
 208         env->CF = (x >> (shift - 1)) & 1;
 209         return x >> shift;
 210     }
 211     return x;
 212 }
 213
 214 uint32_t HELPER(sar_cc)(CPUUniCore32State *env, uint32_t x, uint32_t i)
 215 {
 216     int shift = i & 0xff;
 217     if (shift >= 32) {
 218         env->CF = (x >> 31) & 1;
 219         return (int32_t)x >> 31;
 220     } else if (shift != 0) {
 221         env->CF = (x >> (shift - 1)) & 1;
 222         return (int32_t)x >> shift;
 223     }
 224     return x;
 225 }
 226
 227 uint32_t HELPER(ror_cc)(CPUUniCore32State *env, uint32_t x, uint32_t i)
 228 {
 229     int shift1, shift;
 230     shift1 = i & 0xff;
 231     shift = shift1 & 0x1f;
 232     if (shift == 0) {
 233         if (shift1 != 0) {
 234             env->CF = (x >> 31) & 1;
 235         }
 236         return x;
 237     } else {
 238         env->CF = (x >> (shift - 1)) & 1;
 239         return ((uint32_t)x >> shift) | (x << (32 - shift));
 240     }
 241 }
 242
 243 #ifndef CONFIG_USER_ONLY
 244 #include "exec/softmmu_exec.h"
 245
 246 #define MMUSUFFIX _mmu
 247
 248 #define SHIFT 0
 249 #include "exec/softmmu_template.h"
 250
 251 #define SHIFT 1
 252 #include "exec/softmmu_template.h"
 253
 254 #define SHIFT 2
 255 #include "exec/softmmu_template.h"
 256
 257 #define SHIFT 3
 258 #include "exec/softmmu_template.h"
 259
 260 void tlb_fill(CPUState *cs, target_ulong addr, int is_write,
 261               int mmu_idx, uintptr_t retaddr)
 262 {
 263     int ret;
 264
 265     ret = uc32_cpu_handle_mmu_fault(cs, addr, is_write, mmu_idx);
 266     if (unlikely(ret)) {
 267         if (retaddr) {
 268             /* now we have a real cpu fault */
 269             cpu_restore_state(cs, retaddr);
 270         }
 271         cpu_loop_exit(cs);
 272     }
 273 }
 274 #endif