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 <sys/mman.h>
  29 #include <sys/ipc.h>
  30 #include <errno.h>
  31 #include <unistd.h>
  32
  33 #include "cpu.h"
  34
  35 #if defined(__i386__) && !defined(CONFIG_SOFTMMU) && !defined(CONFIG_USER_ONLY)
  36
  37 /* When not using soft mmu, libc independant functions are needed for
  38    the CPU core because it needs to use alternates stacks and
  39    libc/thread incompatibles settings */
  40
  41 #include <linux/unistd.h>
  42
  43 #define QEMU_SYSCALL0(name) \
  44 { \
  45 long __res; \
  46 __asm__ volatile ("int $0x80" \
  47         : "=a" (__res) \
  48         : "0" (__NR_##name)); \
  49 return __res; \
  50 }
  51
  52 #define QEMU_SYSCALL1(name,arg1) \
  53 { \
  54 long __res; \
  55 __asm__ volatile ("int $0x80" \
  56         : "=a" (__res) \
  57         : "0" (__NR_##name),"b" ((long)(arg1))); \
  58 return __res; \
  59 }
  60
  61 #define QEMU_SYSCALL2(name,arg1,arg2) \
  62 { \
  63 long __res; \
  64 __asm__ volatile ("int $0x80" \
  65         : "=a" (__res) \
  66         : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2))); \
  67 return __res; \
  68 }
  69
  70 #define QEMU_SYSCALL3(name,arg1,arg2,arg3) \
  71 { \
  72 long __res; \
  73 __asm__ volatile ("int $0x80" \
  74         : "=a" (__res) \
  75         : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
  76                   "d" ((long)(arg3))); \
  77 return __res; \
  78 }
  79
  80 #define QEMU_SYSCALL4(name,arg1,arg2,arg3,arg4) \
  81 { \
  82 long __res; \
  83 __asm__ volatile ("int $0x80" \
  84         : "=a" (__res) \
  85         : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
  86           "d" ((long)(arg3)),"S" ((long)(arg4))); \
  87 return __res; \
  88 }
  89
  90 #define QEMU_SYSCALL5(name,arg1,arg2,arg3,arg4,arg5) \
  91 { \
  92 long __res; \
  93 __asm__ volatile ("int $0x80" \
  94         : "=a" (__res) \
  95         : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
  96           "d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5))); \
  97 return __res; \
  98 }
  99
 100 #define QEMU_SYSCALL6(name,arg1,arg2,arg3,arg4,arg5,arg6) \
 101 { \
 102 long __res; \
 103 __asm__ volatile ("push %%ebp ; movl %%eax,%%ebp ; movl %1,%%eax ; int $0x80 ; pop %%ebp" \
 104         : "=a" (__res) \
 105         : "i" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
 106           "d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5)), \
 107           "0" ((long)(arg6))); \
 108 return __res; \
 109 }
 110
 111 int qemu_write(int fd, const void *buf, size_t n)
 112 {
 113     QEMU_SYSCALL3(write, fd, buf, n);
 114 }
 115
 116
 117
 118 /****************************************************************/
 119 /* shmat replacement */
 120
 121 int qemu_ipc(int call, unsigned long first,
 122             unsigned long second, unsigned long third,
 123             void *ptr, unsigned long fifth)
 124 {
 125     QEMU_SYSCALL6(ipc, call, first, second, third, ptr, fifth);
 126 }
 127
 128 #define SHMAT 21
 129
 130 /* we must define shmat so that a specific address will be used when
 131    mapping the X11 ximage */
 132 void *shmat(int shmid, const void *shmaddr, int shmflg)
 133 {
 134     void *ptr;
 135     int ret;
 136     /* we give an address in the right memory area */
 137     if (!shmaddr)
 138         shmaddr = get_mmap_addr(8192 * 1024);
 139     ret = qemu_ipc(SHMAT, shmid, shmflg, (unsigned long)&ptr, (void *)shmaddr, 0);
 140     if (ret < 0)
 141         return NULL;
 142     return ptr;
 143 }
 144
 145 /****************************************************************/
 146 /* memory allocation */
 147
 148 //#define DEBUG_MALLOC
 149
 150 #define MALLOC_BASE       0xab000000
 151 #define PHYS_RAM_BASE     0xac000000
 152
 153 #define MALLOC_ALIGN      16
 154 #define BLOCK_HEADER_SIZE 16
 155
 156 typedef struct MemoryBlock {
 157     struct MemoryBlock *next;
 158     unsigned long size; /* size of block, including header */
 159 } MemoryBlock;
 160
 161 static MemoryBlock *first_free_block;
 162 static unsigned long malloc_addr = MALLOC_BASE;
 163
 164 static void *malloc_get_space(size_t size)
 165 {
 166     void *ptr;
 167     size = TARGET_PAGE_ALIGN(size);
 168     ptr = mmap((void *)malloc_addr, size,
 169                PROT_WRITE | PROT_READ,
 170                MAP_PRIVATE | MAP_FIXED | MAP_ANON, -1, 0);
 171     if (ptr == MAP_FAILED)
 172         return NULL;
 173     malloc_addr += size;
 174     return ptr;
 175 }
 176
 177 void *qemu_malloc(size_t size)
 178 {
 179     MemoryBlock *mb, *mb1, **pmb;
 180     void *ptr;
 181     size_t size1, area_size;
 182
 183     if (size == 0)
 184         return NULL;
 185
 186     size = (size + BLOCK_HEADER_SIZE + MALLOC_ALIGN - 1) & ~(MALLOC_ALIGN - 1);
 187     pmb = &first_free_block;
 188     for(;;) {
 189         mb = *pmb;
 190         if (mb == NULL)
 191             break;
 192         if (size <= mb->size)
 193             goto found;
 194         pmb = &mb->next;
 195     }
 196     /* no big enough blocks found: get new space */
 197     area_size = TARGET_PAGE_ALIGN(size);
 198     mb = malloc_get_space(area_size);
 199     if (!mb)
 200         return NULL;
 201     size1 = area_size - size;
 202     if (size1 > 0) {
 203         /* create a new free block */
 204         mb1 = (MemoryBlock *)((uint8_t *)mb + size);
 205         mb1->next = NULL;
 206         mb1->size = size1;
 207         *pmb = mb1;
 208     }
 209     goto the_end;
 210  found:
 211     /* a free block was found: use it */
 212     size1 = mb->size - size;
 213     if (size1 > 0) {
 214         /* create a new free block */
 215         mb1 = (MemoryBlock *)((uint8_t *)mb + size);
 216         mb1->next = mb->next;
 217         mb1->size = size1;
 218         *pmb = mb1;
 219     } else {
 220         /* suppress the first block */
 221         *pmb = mb->next;
 222     }
 223  the_end:
 224     mb->size = size;
 225     mb->next = NULL;
 226     ptr = ((uint8_t *)mb + BLOCK_HEADER_SIZE);
 227 #ifdef DEBUG_MALLOC
 228     qemu_printf("malloc: size=0x%x ptr=0x%lx\n", size, (unsigned long)ptr);
 229 #endif
 230     return ptr;
 231 }
 232
 233 void qemu_free(void *ptr)
 234 {
 235     MemoryBlock *mb;
 236
 237     mb = (MemoryBlock *)((uint8_t *)ptr - BLOCK_HEADER_SIZE);
 238     mb->next = first_free_block;
 239     first_free_block = mb;
 240 }
 241
 242 /****************************************************************/
 243 /* virtual memory allocation */
 244
 245 unsigned long mmap_addr = PHYS_RAM_BASE;
 246
 247 void *get_mmap_addr(unsigned long size)
 248 {
 249     unsigned long addr;
 250     addr = mmap_addr;
 251     mmap_addr += ((size + 4095) & ~4095) + 4096;
 252     return (void *)addr;
 253 }
 254
 255 #else
 256
 257 int qemu_write(int fd, const void *buf, size_t n)
 258 {
 259     int ret;
 260     ret = write(fd, buf, n);
 261     if (ret < 0)
 262         return -errno;
 263     else
 264         return ret;
 265 }
 266
 267 void *get_mmap_addr(unsigned long size)
 268 {
 269     return NULL;
 270 }
 271
 272 void qemu_free(void *ptr)
 273 {
 274     free(ptr);
 275 }
 276
 277 void *qemu_malloc(size_t size)
 278 {
 279     return malloc(size);
 280 }
 281
 282 #endif
 283
 284 /****************************************************************/
 285 /* printf support */
 286
 287 static inline int qemu_isdigit(int c)
 288 {
 289     return c >= '0' && c <= '9';
 290 }
 291
 292 #define OUTCHAR(c)      (buflen > 0? (--buflen, *buf++ = (c)): 0)
 293
 294 /* from BSD ppp sources */
 295 int qemu_vsnprintf(char *buf, int buflen, const char *fmt, va_list args)
 296 {
 297     int c, i, n;
 298     int width, prec, fillch;
 299     int base, len, neg;
 300     unsigned long val = 0;
 301     const char *f;
 302     char *str, *buf0;
 303     char num[32];
 304     static const char hexchars[] = "0123456789abcdef";
 305
 306     buf0 = buf;
 307     --buflen;
 308     while (buflen > 0) {
 309         for (f = fmt; *f != '%' && *f != 0; ++f)
 310             ;
 311         if (f > fmt) {
 312             len = f - fmt;
 313             if (len > buflen)
 314                 len = buflen;
 315             memcpy(buf, fmt, len);
 316             buf += len;
 317             buflen -= len;
 318             fmt = f;
 319         }
 320         if (*fmt == 0)
 321             break;
 322         c = *++fmt;
 323         width = prec = 0;
 324         fillch = ' ';
 325         if (c == '0') {
 326             fillch = '0';
 327             c = *++fmt;
 328         }
 329         if (c == '*') {
 330             width = va_arg(args, int);
 331             c = *++fmt;
 332         } else {
 333             while (qemu_isdigit(c)) {
 334                 width = width * 10 + c - '0';
 335                 c = *++fmt;
 336             }
 337         }
 338         if (c == '.') {
 339             c = *++fmt;
 340             if (c == '*') {
 341                 prec = va_arg(args, int);
 342                 c = *++fmt;
 343             } else {
 344                 while (qemu_isdigit(c)) {
 345                     prec = prec * 10 + c - '0';
 346                     c = *++fmt;
 347                 }
 348             }
 349         }
 350         /* modifiers */
 351         switch(c) {
 352         case 'l':
 353             c = *++fmt;
 354             break;
 355         default:
 356             break;
 357         }
 358         str = 0;
 359         base = 0;
 360         neg = 0;
 361         ++fmt;
 362         switch (c) {
 363         case 'd':
 364             i = va_arg(args, int);
 365             if (i < 0) {
 366                 neg = 1;
 367                 val = -i;
 368             } else
 369                 val = i;
 370             base = 10;
 371             break;
 372         case 'o':
 373             val = va_arg(args, unsigned int);
 374             base = 8;
 375             break;
 376         case 'x':
 377         case 'X':
 378             val = va_arg(args, unsigned int);
 379             base = 16;
 380             break;
 381         case 'p':
 382             val = (unsigned long) va_arg(args, void *);
 383             base = 16;
 384             neg = 2;
 385             break;
 386         case 's':
 387             str = va_arg(args, char *);
 388             break;
 389         case 'c':
 390             num[0] = va_arg(args, int);
 391             num[1] = 0;
 392             str = num;
 393             break;
 394         default:
 395             *buf++ = '%';
 396             if (c != '%')
 397                 --fmt;          /* so %z outputs %z etc. */
 398             --buflen;
 399             continue;
 400         }
 401         if (base != 0) {
 402             str = num + sizeof(num);
 403             *--str = 0;
 404             while (str > num + neg) {
 405                 *--str = hexchars[val % base];
 406                 val = val / base;
 407                 if (--prec <= 0 && val == 0)
 408                     break;
 409             }
 410             switch (neg) {
 411             case 1:
 412                 *--str = '-';
 413                 break;
 414             case 2:
 415                 *--str = 'x';
 416                 *--str = '0';
 417                 break;
 418             }
 419             len = num + sizeof(num) - 1 - str;
 420         } else {
 421             len = strlen(str);
 422             if (prec > 0 && len > prec)
 423                 len = prec;
 424         }
 425         if (width > 0) {
 426             if (width > buflen)
 427                 width = buflen;
 428             if ((n = width - len) > 0) {
 429                 buflen -= n;
 430                 for (; n > 0; --n)
 431                     *buf++ = fillch;
 432             }
 433         }
 434         if (len > buflen)
 435             len = buflen;
 436         memcpy(buf, str, len);
 437         buf += len;
 438         buflen -= len;
 439     }
 440     *buf = 0;
 441     return buf - buf0;
 442 }
 443
 444 void qemu_vprintf(const char *fmt, va_list ap)
 445 {
 446     char buf[1024];
 447     int len;
 448
 449     len = qemu_vsnprintf(buf, sizeof(buf), fmt, ap);
 450     qemu_write(1, buf, len);
 451 }
 452
 453 void qemu_printf(const char *fmt, ...)
 454 {
 455     va_list ap;
 456     va_start(ap, fmt);
 457     qemu_vprintf(fmt, ap);
 458     va_end(ap);
 459 }
 460