osdep.c

   1 /*
   2  * QEMU low level functions
   3  *
   4  * Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <stdarg.h>
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <unistd.h>
  30
  31 #include "cpu.h"
  32
  33 #if defined(__i386__) && !defined(CONFIG_SOFTMMU) && !defined(CONFIG_USER_ONLY)
  34
  35 #include <sys/mman.h>
  36 #include <sys/ipc.h>
  37
  38 /* When not using soft mmu, libc independant functions are needed for
  39    the CPU core because it needs to use alternates stacks and
  40    libc/thread incompatibles settings */
  41
  42 #include <linux/unistd.h>
  43
  44 #define QEMU_SYSCALL0(name) \
  45 { \
  46 long __res; \
  47 __asm__ volatile ("int $0x80" \
  48         : "=a" (__res) \
  49         : "0" (__NR_##name)); \
  50 return __res; \
  51 }
  52
  53 #define QEMU_SYSCALL1(name,arg1) \
  54 { \
  55 long __res; \
  56 __asm__ volatile ("int $0x80" \
  57         : "=a" (__res) \
  58         : "0" (__NR_##name),"b" ((long)(arg1))); \
  59 return __res; \
  60 }
  61
  62 #define QEMU_SYSCALL2(name,arg1,arg2) \
  63 { \
  64 long __res; \
  65 __asm__ volatile ("int $0x80" \
  66         : "=a" (__res) \
  67         : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2))); \
  68 return __res; \
  69 }
  70
  71 #define QEMU_SYSCALL3(name,arg1,arg2,arg3) \
  72 { \
  73 long __res; \
  74 __asm__ volatile ("int $0x80" \
  75         : "=a" (__res) \
  76         : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
  77                   "d" ((long)(arg3))); \
  78 return __res; \
  79 }
  80
  81 #define QEMU_SYSCALL4(name,arg1,arg2,arg3,arg4) \
  82 { \
  83 long __res; \
  84 __asm__ volatile ("int $0x80" \
  85         : "=a" (__res) \
  86         : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
  87           "d" ((long)(arg3)),"S" ((long)(arg4))); \
  88 return __res; \
  89 }
  90
  91 #define QEMU_SYSCALL5(name,arg1,arg2,arg3,arg4,arg5) \
  92 { \
  93 long __res; \
  94 __asm__ volatile ("int $0x80" \
  95         : "=a" (__res) \
  96         : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
  97           "d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5))); \
  98 return __res; \
  99 }
 100
 101 #define QEMU_SYSCALL6(name,arg1,arg2,arg3,arg4,arg5,arg6) \
 102 { \
 103 long __res; \
 104 __asm__ volatile ("push %%ebp ; movl %%eax,%%ebp ; movl %1,%%eax ; int $0x80 ; pop %%ebp" \
 105         : "=a" (__res) \
 106         : "i" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
 107           "d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5)), \
 108           "0" ((long)(arg6))); \
 109 return __res; \
 110 }
 111
 112 int qemu_write(int fd, const void *buf, size_t n)
 113 {
 114     QEMU_SYSCALL3(write, fd, buf, n);
 115 }
 116
 117
 118
 119 /****************************************************************/
 120 /* shmat replacement */
 121
 122 int qemu_ipc(int call, unsigned long first,
 123             unsigned long second, unsigned long third,
 124             void *ptr, unsigned long fifth)
 125 {
 126     QEMU_SYSCALL6(ipc, call, first, second, third, ptr, fifth);
 127 }
 128
 129 #define SHMAT 21
 130
 131 /* we must define shmat so that a specific address will be used when
 132    mapping the X11 ximage */
 133 void *shmat(int shmid, const void *shmaddr, int shmflg)
 134 {
 135     void *ptr;
 136     int ret;
 137     /* we give an address in the right memory area */
 138     if (!shmaddr)
 139         shmaddr = get_mmap_addr(8192 * 1024);
 140     ret = qemu_ipc(SHMAT, shmid, shmflg, (unsigned long)&ptr, (void *)shmaddr, 0);
 141     if (ret < 0)
 142         return NULL;
 143     return ptr;
 144 }
 145
 146 /****************************************************************/
 147 /* sigaction bypassing the threads */
 148
 149 static int kernel_sigaction(int signum, const struct qemu_sigaction *act,
 150                             struct qemu_sigaction *oldact,
 151                             int sigsetsize)
 152 {
 153     QEMU_SYSCALL4(rt_sigaction, signum, act, oldact, sigsetsize);
 154 }
 155
 156 int qemu_sigaction(int signum, const struct qemu_sigaction *act,
 157                    struct qemu_sigaction *oldact)
 158 {
 159     return kernel_sigaction(signum, act, oldact, 8);
 160 }
 161
 162 /****************************************************************/
 163 /* memory allocation */
 164
 165 //#define DEBUG_MALLOC
 166
 167 #define MALLOC_BASE       0xab000000
 168 #define PHYS_RAM_BASE     0xac000000
 169
 170 #define MALLOC_ALIGN      16
 171 #define BLOCK_HEADER_SIZE 16
 172
 173 typedef struct MemoryBlock {
 174     struct MemoryBlock *next;
 175     unsigned long size; /* size of block, including header */
 176 } MemoryBlock;
 177
 178 static MemoryBlock *first_free_block;
 179 static unsigned long malloc_addr = MALLOC_BASE;
 180
 181 static void *malloc_get_space(size_t size)
 182 {
 183     void *ptr;
 184     size = TARGET_PAGE_ALIGN(size);
 185     ptr = mmap((void *)malloc_addr, size,
 186                PROT_WRITE | PROT_READ,
 187                MAP_PRIVATE | MAP_FIXED | MAP_ANON, -1, 0);
 188     if (ptr == MAP_FAILED)
 189         return NULL;
 190     malloc_addr += size;
 191     return ptr;
 192 }
 193
 194 void *qemu_malloc(size_t size)
 195 {
 196     MemoryBlock *mb, *mb1, **pmb;
 197     void *ptr;
 198     size_t size1, area_size;
 199
 200     if (size == 0)
 201         return NULL;
 202
 203     size = (size + BLOCK_HEADER_SIZE + MALLOC_ALIGN - 1) & ~(MALLOC_ALIGN - 1);
 204     pmb = &first_free_block;
 205     for(;;) {
 206         mb = *pmb;
 207         if (mb == NULL)
 208             break;
 209         if (size <= mb->size)
 210             goto found;
 211         pmb = &mb->next;
 212     }
 213     /* no big enough blocks found: get new space */
 214     area_size = TARGET_PAGE_ALIGN(size);
 215     mb = malloc_get_space(area_size);
 216     if (!mb)
 217         return NULL;
 218     size1 = area_size - size;
 219     if (size1 > 0) {
 220         /* create a new free block */
 221         mb1 = (MemoryBlock *)((uint8_t *)mb + size);
 222         mb1->next = NULL;
 223         mb1->size = size1;
 224         *pmb = mb1;
 225     }
 226     goto the_end;
 227  found:
 228     /* a free block was found: use it */
 229     size1 = mb->size - size;
 230     if (size1 > 0) {
 231         /* create a new free block */
 232         mb1 = (MemoryBlock *)((uint8_t *)mb + size);
 233         mb1->next = mb->next;
 234         mb1->size = size1;
 235         *pmb = mb1;
 236     } else {
 237         /* suppress the first block */
 238         *pmb = mb->next;
 239     }
 240  the_end:
 241     mb->size = size;
 242     mb->next = NULL;
 243     ptr = ((uint8_t *)mb + BLOCK_HEADER_SIZE);
 244 #ifdef DEBUG_MALLOC
 245     qemu_printf("malloc: size=0x%x ptr=0x%lx\n", size, (unsigned long)ptr);
 246 #endif
 247     return ptr;
 248 }
 249
 250 void qemu_free(void *ptr)
 251 {
 252     MemoryBlock *mb;
 253
 254     if (!ptr)
 255         return;
 256     mb = (MemoryBlock *)((uint8_t *)ptr - BLOCK_HEADER_SIZE);
 257     mb->next = first_free_block;
 258     first_free_block = mb;
 259 }
 260
 261 /****************************************************************/
 262 /* virtual memory allocation */
 263
 264 unsigned long mmap_addr = PHYS_RAM_BASE;
 265
 266 void *get_mmap_addr(unsigned long size)
 267 {
 268     unsigned long addr;
 269     addr = mmap_addr;
 270     mmap_addr += ((size + 4095) & ~4095) + 4096;
 271     return (void *)addr;
 272 }
 273
 274 #else
 275
 276 #ifdef _WIN32
 277 #include <windows.h>
 278 #elif defined(_BSD)
 279 #include <stdlib.h>
 280 #else
 281 #include <malloc.h>
 282 #endif
 283
 284 int qemu_write(int fd, const void *buf, size_t n)
 285 {
 286     int ret;
 287     ret = write(fd, buf, n);
 288     if (ret < 0)
 289         return -errno;
 290     else
 291         return ret;
 292 }
 293
 294 void *get_mmap_addr(unsigned long size)
 295 {
 296     return NULL;
 297 }
 298
 299 void qemu_free(void *ptr)
 300 {
 301     free(ptr);
 302 }
 303
 304 void *qemu_malloc(size_t size)
 305 {
 306     return malloc(size);
 307 }
 308
 309 #if defined(_WIN32)
 310
 311 void *qemu_vmalloc(size_t size)
 312 {
 313     /* FIXME: this is not exactly optimal solution since VirtualAlloc
 314        has 64Kb granularity, but at least it guarantees us that the
 315        memory is page aligned. */
 316     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
 317 }
 318
 319 void qemu_vfree(void *ptr)
 320 {
 321     VirtualFree(ptr, 0, MEM_RELEASE);
 322 }
 323
 324 #elif defined(USE_KQEMU)
 325
 326 #include <sys/mman.h>
 327 #include <fcntl.h>
 328
 329 void *qemu_vmalloc(size_t size)
 330 {
 331     static int phys_ram_fd = -1;
 332     static int phys_ram_size = 0;
 333     const char *tmpdir;
 334     char phys_ram_file[1024];
 335     void *ptr;
 336
 337     if (phys_ram_fd < 0) {
 338         tmpdir = getenv("QEMU_TMPDIR");
 339         if (!tmpdir)
 340             tmpdir = "/dev/shm";
 341         snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 342                  tmpdir);
 343         if (mkstemp(phys_ram_file) < 0) {
 344             fprintf(stderr,
 345                     "warning: could not create temporary file in '%s'.\n"
 346                     "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
 347                     "Using '/tmp' as fallback.\n",
 348                     tmpdir);
 349             snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 350                      "/tmp");
 351             if (mkstemp(phys_ram_file) < 0) {
 352                 fprintf(stderr, "Could not create temporary memory file '%s'\n",
 353                         phys_ram_file);
 354                 exit(1);
 355             }
 356         }
 357         phys_ram_fd = open(phys_ram_file, O_CREAT | O_TRUNC | O_RDWR, 0600);
 358         if (phys_ram_fd < 0) {
 359             fprintf(stderr, "Could not open temporary memory file '%s'\n",
 360                     phys_ram_file);
 361             exit(1);
 362         }
 363         unlink(phys_ram_file);
 364     }
 365     size = (size + 4095) & ~4095;
 366     ftruncate(phys_ram_fd, phys_ram_size + size);
 367     ptr = mmap(NULL,
 368                size,
 369                PROT_WRITE | PROT_READ, MAP_SHARED,
 370                phys_ram_fd, phys_ram_size);
 371     if (ptr == MAP_FAILED) {
 372         fprintf(stderr, "Could not map physical memory\n");
 373         exit(1);
 374     }
 375     phys_ram_size += size;
 376     return ptr;
 377 }
 378
 379 void qemu_vfree(void *ptr)
 380 {
 381     /* may be useful some day, but currently we do not need to free */
 382 }
 383
 384 #else
 385
 386 /* alloc shared memory pages */
 387 void *qemu_vmalloc(size_t size)
 388 {
 389 #ifdef _BSD
 390     return valloc(size);
 391 #else
 392     return memalign(4096, size);
 393 #endif
 394 }
 395
 396 void qemu_vfree(void *ptr)
 397 {
 398     free(ptr);
 399 }
 400
 401 #endif
 402
 403 #endif
 404
 405 void *qemu_mallocz(size_t size)
 406 {
 407     void *ptr;
 408     ptr = qemu_malloc(size);
 409     if (!ptr)
 410         return NULL;
 411     memset(ptr, 0, size);
 412     return ptr;
 413 }
 414
 415 char *qemu_strdup(const char *str)
 416 {
 417     char *ptr;
 418     ptr = qemu_malloc(strlen(str) + 1);
 419     if (!ptr)
 420         return NULL;
 421     strcpy(ptr, str);
 422     return ptr;
 423 }
 424
 425 /****************************************************************/
 426 /* printf support */
 427
 428 static inline int qemu_isdigit(int c)
 429 {
 430     return c >= '0' && c <= '9';
 431 }
 432
 433 #define OUTCHAR(c)      (buflen > 0? (--buflen, *buf++ = (c)): 0)
 434
 435 /* from BSD ppp sources */
 436 int qemu_vsnprintf(char *buf, int buflen, const char *fmt, va_list args)
 437 {
 438     int c, i, n;
 439     int width, prec, fillch;
 440     int base, len, neg;
 441     unsigned long val = 0;
 442     const char *f;
 443     char *str, *buf0;
 444     char num[32];
 445     static const char hexchars[] = "0123456789abcdef";
 446
 447     buf0 = buf;
 448     --buflen;
 449     while (buflen > 0) {
 450         for (f = fmt; *f != '%' && *f != 0; ++f)
 451             ;
 452         if (f > fmt) {
 453             len = f - fmt;
 454             if (len > buflen)
 455                 len = buflen;
 456             memcpy(buf, fmt, len);
 457             buf += len;
 458             buflen -= len;
 459             fmt = f;
 460         }
 461         if (*fmt == 0)
 462             break;
 463         c = *++fmt;
 464         width = prec = 0;
 465         fillch = ' ';
 466         if (c == '0') {
 467             fillch = '0';
 468             c = *++fmt;
 469         }
 470         if (c == '*') {
 471             width = va_arg(args, int);
 472             c = *++fmt;
 473         } else {
 474             while (qemu_isdigit(c)) {
 475                 width = width * 10 + c - '0';
 476                 c = *++fmt;
 477             }
 478         }
 479         if (c == '.') {
 480             c = *++fmt;
 481             if (c == '*') {
 482                 prec = va_arg(args, int);
 483                 c = *++fmt;
 484             } else {
 485                 while (qemu_isdigit(c)) {
 486                     prec = prec * 10 + c - '0';
 487                     c = *++fmt;
 488                 }
 489             }
 490         }
 491         /* modifiers */
 492         switch(c) {
 493         case 'l':
 494             c = *++fmt;
 495             break;
 496         default:
 497             break;
 498         }
 499         str = 0;
 500         base = 0;
 501         neg = 0;
 502         ++fmt;
 503         switch (c) {
 504         case 'd':
 505             i = va_arg(args, int);
 506             if (i < 0) {
 507                 neg = 1;
 508                 val = -i;
 509             } else
 510                 val = i;
 511             base = 10;
 512             break;
 513         case 'o':
 514             val = va_arg(args, unsigned int);
 515             base = 8;
 516             break;
 517         case 'x':
 518         case 'X':
 519             val = va_arg(args, unsigned int);
 520             base = 16;
 521             break;
 522         case 'p':
 523             val = (unsigned long) va_arg(args, void *);
 524             base = 16;
 525             neg = 2;
 526             break;
 527         case 's':
 528             str = va_arg(args, char *);
 529             break;
 530         case 'c':
 531             num[0] = va_arg(args, int);
 532             num[1] = 0;
 533             str = num;
 534             break;
 535         default:
 536             *buf++ = '%';
 537             if (c != '%')
 538                 --fmt;          /* so %z outputs %z etc. */
 539             --buflen;
 540             continue;
 541         }
 542         if (base != 0) {
 543             str = num + sizeof(num);
 544             *--str = 0;
 545             while (str > num + neg) {
 546                 *--str = hexchars[val % base];
 547                 val = val / base;
 548                 if (--prec <= 0 && val == 0)
 549                     break;
 550             }
 551             switch (neg) {
 552             case 1:
 553                 *--str = '-';
 554                 break;
 555             case 2:
 556                 *--str = 'x';
 557                 *--str = '0';
 558                 break;
 559             }
 560             len = num + sizeof(num) - 1 - str;
 561         } else {
 562             len = strlen(str);
 563             if (prec > 0 && len > prec)
 564                 len = prec;
 565         }
 566         if (width > 0) {
 567             if (width > buflen)
 568                 width = buflen;
 569             if ((n = width - len) > 0) {
 570                 buflen -= n;
 571                 for (; n > 0; --n)
 572                     *buf++ = fillch;
 573             }
 574         }
 575         if (len > buflen)
 576             len = buflen;
 577         memcpy(buf, str, len);
 578         buf += len;
 579         buflen -= len;
 580     }
 581     *buf = 0;
 582     return buf - buf0;
 583 }
 584
 585 void qemu_vprintf(const char *fmt, va_list ap)
 586 {
 587     char buf[1024];
 588     int len;
 589
 590     len = qemu_vsnprintf(buf, sizeof(buf), fmt, ap);
 591     qemu_write(1, buf, len);
 592 }
 593
 594 void qemu_printf(const char *fmt, ...)
 595 {
 596     va_list ap;
 597     va_start(ap, fmt);
 598     qemu_vprintf(fmt, ap);
 599     va_end(ap);
 600 }
 601