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