include/exec/softmmu_template.h

   1 /*
   2  *  Software MMU support
   3  *
   4  * Generate helpers used by TCG for qemu_ld/st ops and code load
   5  * functions.
   6  *
   7  * Included from target op helpers and exec.c.
   8  *
   9  *  Copyright (c) 2003 Fabrice Bellard
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; either
  14  * version 2 of the License, or (at your option) any later version.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  23  */
  24 #include "qemu/timer.h"
  25 #include "exec/memory.h"
  26
  27 #define DATA_SIZE (1 << SHIFT)
  28
  29 #if DATA_SIZE == 8
  30 #define SUFFIX q
  31 #define USUFFIX q
  32 #define DATA_TYPE uint64_t
  33 #elif DATA_SIZE == 4
  34 #define SUFFIX l
  35 #define USUFFIX l
  36 #define DATA_TYPE uint32_t
  37 #elif DATA_SIZE == 2
  38 #define SUFFIX w
  39 #define USUFFIX uw
  40 #define DATA_TYPE uint16_t
  41 #elif DATA_SIZE == 1
  42 #define SUFFIX b
  43 #define USUFFIX ub
  44 #define DATA_TYPE uint8_t
  45 #else
  46 #error unsupported data size
  47 #endif
  48
  49 #ifdef SOFTMMU_CODE_ACCESS
  50 #define READ_ACCESS_TYPE 2
  51 #define ADDR_READ addr_code
  52 #else
  53 #define READ_ACCESS_TYPE 0
  54 #define ADDR_READ addr_read
  55 #endif
  56
  57 static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(CPUArchState *env,
  58                                                         target_ulong addr,
  59                                                         int mmu_idx,
  60                                                         uintptr_t retaddr);
  61 static inline DATA_TYPE glue(io_read, SUFFIX)(CPUArchState *env,
  62                                               hwaddr physaddr,
  63                                               target_ulong addr,
  64                                               uintptr_t retaddr)
  65 {
  66     DATA_TYPE res;
  67     MemoryRegion *mr = iotlb_to_region(physaddr);
  68
  69     physaddr = (physaddr & TARGET_PAGE_MASK) + addr;
  70     env->mem_io_pc = retaddr;
  71     if (mr != &io_mem_ram && mr != &io_mem_rom
  72         && mr != &io_mem_unassigned
  73         && mr != &io_mem_notdirty
  74             && !can_do_io(env)) {
  75         cpu_io_recompile(env, retaddr);
  76     }
  77
  78     env->mem_io_vaddr = addr;
  79 #if SHIFT <= 2
  80     res = io_mem_read(mr, physaddr, 1 << SHIFT);
  81 #else
  82 #ifdef TARGET_WORDS_BIGENDIAN
  83     res = io_mem_read(mr, physaddr, 4) << 32;
  84     res |= io_mem_read(mr, physaddr + 4, 4);
  85 #else
  86     res = io_mem_read(mr, physaddr, 4);
  87     res |= io_mem_read(mr, physaddr + 4, 4) << 32;
  88 #endif
  89 #endif /* SHIFT > 2 */
  90     return res;
  91 }
  92
  93 /* handle all cases except unaligned access which span two pages */
  94 DATA_TYPE
  95 glue(glue(helper_ld, SUFFIX), MMUSUFFIX)(CPUArchState *env, target_ulong addr,
  96                                          int mmu_idx)
  97 {
  98     DATA_TYPE res;
  99     int index;
 100     target_ulong tlb_addr;
 101     hwaddr ioaddr;
 102     uintptr_t retaddr;
 103
 104     /* test if there is match for unaligned or IO access */
 105     /* XXX: could done more in memory macro in a non portable way */
 106     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 107  redo:
 108     tlb_addr = env->tlb_table[mmu_idx][index].ADDR_READ;
 109     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 110         if (tlb_addr & ~TARGET_PAGE_MASK) {
 111             /* IO access */
 112             if ((addr & (DATA_SIZE - 1)) != 0)
 113                 goto do_unaligned_access;
 114             retaddr = GETPC_EXT();
 115             ioaddr = env->iotlb[mmu_idx][index];
 116             res = glue(io_read, SUFFIX)(env, ioaddr, addr, retaddr);
 117         } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 118             /* slow unaligned access (it spans two pages or IO) */
 119         do_unaligned_access:
 120             retaddr = GETPC_EXT();
 121 #ifdef ALIGNED_ONLY
 122             do_unaligned_access(env, addr, READ_ACCESS_TYPE, mmu_idx, retaddr);
 123 #endif
 124             res = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(env, addr,
 125                                                          mmu_idx, retaddr);
 126         } else {
 127             /* unaligned/aligned access in the same page */
 128             uintptr_t addend;
 129 #ifdef ALIGNED_ONLY
 130             if ((addr & (DATA_SIZE - 1)) != 0) {
 131                 retaddr = GETPC_EXT();
 132                 do_unaligned_access(env, addr, READ_ACCESS_TYPE, mmu_idx, retaddr);
 133             }
 134 #endif
 135             addend = env->tlb_table[mmu_idx][index].addend;
 136             res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)(intptr_t)
 137                                                 (addr + addend));
 138         }
 139     } else {
 140         /* the page is not in the TLB : fill it */
 141         retaddr = GETPC_EXT();
 142 #ifdef ALIGNED_ONLY
 143         if ((addr & (DATA_SIZE - 1)) != 0)
 144             do_unaligned_access(env, addr, READ_ACCESS_TYPE, mmu_idx, retaddr);
 145 #endif
 146         tlb_fill(env, addr, READ_ACCESS_TYPE, mmu_idx, retaddr);
 147         goto redo;
 148     }
 149     return res;
 150 }
 151
 152 /* handle all unaligned cases */
 153 static DATA_TYPE
 154 glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(CPUArchState *env,
 155                                        target_ulong addr,
 156                                        int mmu_idx,
 157                                        uintptr_t retaddr)
 158 {
 159     DATA_TYPE res, res1, res2;
 160     int index, shift;
 161     hwaddr ioaddr;
 162     target_ulong tlb_addr, addr1, addr2;
 163
 164     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 165  redo:
 166     tlb_addr = env->tlb_table[mmu_idx][index].ADDR_READ;
 167     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 168         if (tlb_addr & ~TARGET_PAGE_MASK) {
 169             /* IO access */
 170             if ((addr & (DATA_SIZE - 1)) != 0)
 171                 goto do_unaligned_access;
 172             ioaddr = env->iotlb[mmu_idx][index];
 173             res = glue(io_read, SUFFIX)(env, ioaddr, addr, retaddr);
 174         } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 175         do_unaligned_access:
 176             /* slow unaligned access (it spans two pages) */
 177             addr1 = addr & ~(DATA_SIZE - 1);
 178             addr2 = addr1 + DATA_SIZE;
 179             res1 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(env, addr1,
 180                                                           mmu_idx, retaddr);
 181             res2 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(env, addr2,
 182                                                           mmu_idx, retaddr);
 183             shift = (addr & (DATA_SIZE - 1)) * 8;
 184 #ifdef TARGET_WORDS_BIGENDIAN
 185             res = (res1 << shift) | (res2 >> ((DATA_SIZE * 8) - shift));
 186 #else
 187             res = (res1 >> shift) | (res2 << ((DATA_SIZE * 8) - shift));
 188 #endif
 189             res = (DATA_TYPE)res;
 190         } else {
 191             /* unaligned/aligned access in the same page */
 192             uintptr_t addend = env->tlb_table[mmu_idx][index].addend;
 193             res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)(intptr_t)
 194                                                 (addr + addend));
 195         }
 196     } else {
 197         /* the page is not in the TLB : fill it */
 198         tlb_fill(env, addr, READ_ACCESS_TYPE, mmu_idx, retaddr);
 199         goto redo;
 200     }
 201     return res;
 202 }
 203
 204 #ifndef SOFTMMU_CODE_ACCESS
 205
 206 static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(CPUArchState *env,
 207                                                    target_ulong addr,
 208                                                    DATA_TYPE val,
 209                                                    int mmu_idx,
 210                                                    uintptr_t retaddr);
 211
 212 static inline void glue(io_write, SUFFIX)(CPUArchState *env,
 213                                           hwaddr physaddr,
 214                                           DATA_TYPE val,
 215                                           target_ulong addr,
 216                                           uintptr_t retaddr)
 217 {
 218     MemoryRegion *mr = iotlb_to_region(physaddr);
 219
 220     physaddr = (physaddr & TARGET_PAGE_MASK) + addr;
 221     if (mr != &io_mem_ram && mr != &io_mem_rom
 222         && mr != &io_mem_unassigned
 223         && mr != &io_mem_notdirty
 224             && !can_do_io(env)) {
 225         cpu_io_recompile(env, retaddr);
 226     }
 227
 228     env->mem_io_vaddr = addr;
 229     env->mem_io_pc = retaddr;
 230 #if SHIFT <= 2
 231     io_mem_write(mr, physaddr, val, 1 << SHIFT);
 232 #else
 233 #ifdef TARGET_WORDS_BIGENDIAN
 234     io_mem_write(mr, physaddr, (val >> 32), 4);
 235     io_mem_write(mr, physaddr + 4, (uint32_t)val, 4);
 236 #else
 237     io_mem_write(mr, physaddr, (uint32_t)val, 4);
 238     io_mem_write(mr, physaddr + 4, val >> 32, 4);
 239 #endif
 240 #endif /* SHIFT > 2 */
 241 }
 242
 243 void glue(glue(helper_st, SUFFIX), MMUSUFFIX)(CPUArchState *env,
 244                                               target_ulong addr, DATA_TYPE val,
 245                                               int mmu_idx)
 246 {
 247     hwaddr ioaddr;
 248     target_ulong tlb_addr;
 249     uintptr_t retaddr;
 250     int index;
 251
 252     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 253  redo:
 254     tlb_addr = env->tlb_table[mmu_idx][index].addr_write;
 255     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 256         if (tlb_addr & ~TARGET_PAGE_MASK) {
 257             /* IO access */
 258             if ((addr & (DATA_SIZE - 1)) != 0)
 259                 goto do_unaligned_access;
 260             retaddr = GETPC_EXT();
 261             ioaddr = env->iotlb[mmu_idx][index];
 262             glue(io_write, SUFFIX)(env, ioaddr, val, addr, retaddr);
 263         } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 264         do_unaligned_access:
 265             retaddr = GETPC_EXT();
 266 #ifdef ALIGNED_ONLY
 267             do_unaligned_access(env, addr, 1, mmu_idx, retaddr);
 268 #endif
 269             glue(glue(slow_st, SUFFIX), MMUSUFFIX)(env, addr, val,
 270                                                    mmu_idx, retaddr);
 271         } else {
 272             /* aligned/unaligned access in the same page */
 273             uintptr_t addend;
 274 #ifdef ALIGNED_ONLY
 275             if ((addr & (DATA_SIZE - 1)) != 0) {
 276                 retaddr = GETPC_EXT();
 277                 do_unaligned_access(env, addr, 1, mmu_idx, retaddr);
 278             }
 279 #endif
 280             addend = env->tlb_table[mmu_idx][index].addend;
 281             glue(glue(st, SUFFIX), _raw)((uint8_t *)(intptr_t)
 282                                          (addr + addend), val);
 283         }
 284     } else {
 285         /* the page is not in the TLB : fill it */
 286         retaddr = GETPC_EXT();
 287 #ifdef ALIGNED_ONLY
 288         if ((addr & (DATA_SIZE - 1)) != 0)
 289             do_unaligned_access(env, addr, 1, mmu_idx, retaddr);
 290 #endif
 291         tlb_fill(env, addr, 1, mmu_idx, retaddr);
 292         goto redo;
 293     }
 294 }
 295
 296 /* handles all unaligned cases */
 297 static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(CPUArchState *env,
 298                                                    target_ulong addr,
 299                                                    DATA_TYPE val,
 300                                                    int mmu_idx,
 301                                                    uintptr_t retaddr)
 302 {
 303     hwaddr ioaddr;
 304     target_ulong tlb_addr;
 305     int index, i;
 306
 307     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 308  redo:
 309     tlb_addr = env->tlb_table[mmu_idx][index].addr_write;
 310     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 311         if (tlb_addr & ~TARGET_PAGE_MASK) {
 312             /* IO access */
 313             if ((addr & (DATA_SIZE - 1)) != 0)
 314                 goto do_unaligned_access;
 315             ioaddr = env->iotlb[mmu_idx][index];
 316             glue(io_write, SUFFIX)(env, ioaddr, val, addr, retaddr);
 317         } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 318         do_unaligned_access:
 319             /* XXX: not efficient, but simple */
 320             /* Note: relies on the fact that tlb_fill() does not remove the
 321              * previous page from the TLB cache.  */
 322             for(i = DATA_SIZE - 1; i >= 0; i--) {
 323 #ifdef TARGET_WORDS_BIGENDIAN
 324                 glue(slow_stb, MMUSUFFIX)(env, addr + i,
 325                                           val >> (((DATA_SIZE - 1) * 8) - (i * 8)),
 326                                           mmu_idx, retaddr);
 327 #else
 328                 glue(slow_stb, MMUSUFFIX)(env, addr + i,
 329                                           val >> (i * 8),
 330                                           mmu_idx, retaddr);
 331 #endif
 332             }
 333         } else {
 334             /* aligned/unaligned access in the same page */
 335             uintptr_t addend = env->tlb_table[mmu_idx][index].addend;
 336             glue(glue(st, SUFFIX), _raw)((uint8_t *)(intptr_t)
 337                                          (addr + addend), val);
 338         }
 339     } else {
 340         /* the page is not in the TLB : fill it */
 341         tlb_fill(env, addr, 1, mmu_idx, retaddr);
 342         goto redo;
 343     }
 344 }
 345
 346 #endif /* !defined(SOFTMMU_CODE_ACCESS) */
 347
 348 #undef READ_ACCESS_TYPE
 349 #undef SHIFT
 350 #undef DATA_TYPE
 351 #undef SUFFIX
 352 #undef USUFFIX
 353 #undef DATA_SIZE
 354 #undef ADDR_READ