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 /* memory allocation */
 148
 149 //#define DEBUG_MALLOC
 150
 151 #define MALLOC_BASE       0xab000000
 152 #define PHYS_RAM_BASE     0xac000000
 153
 154 #define MALLOC_ALIGN      16
 155 #define BLOCK_HEADER_SIZE 16
 156
 157 typedef struct MemoryBlock {
 158     struct MemoryBlock *next;
 159     unsigned long size; /* size of block, including header */
 160 } MemoryBlock;
 161
 162 static MemoryBlock *first_free_block;
 163 static unsigned long malloc_addr = MALLOC_BASE;
 164
 165 static void *malloc_get_space(size_t size)
 166 {
 167     void *ptr;
 168     size = TARGET_PAGE_ALIGN(size);
 169     ptr = mmap((void *)malloc_addr, size,
 170                PROT_WRITE | PROT_READ,
 171                MAP_PRIVATE | MAP_FIXED | MAP_ANON, -1, 0);
 172     if (ptr == MAP_FAILED)
 173         return NULL;
 174     malloc_addr += size;
 175     return ptr;
 176 }
 177
 178 void *qemu_malloc(size_t size)
 179 {
 180     MemoryBlock *mb, *mb1, **pmb;
 181     void *ptr;
 182     size_t size1, area_size;
 183
 184     if (size == 0)
 185         return NULL;
 186
 187     size = (size + BLOCK_HEADER_SIZE + MALLOC_ALIGN - 1) & ~(MALLOC_ALIGN - 1);
 188     pmb = &first_free_block;
 189     for(;;) {
 190         mb = *pmb;
 191         if (mb == NULL)
 192             break;
 193         if (size <= mb->size)
 194             goto found;
 195         pmb = &mb->next;
 196     }
 197     /* no big enough blocks found: get new space */
 198     area_size = TARGET_PAGE_ALIGN(size);
 199     mb = malloc_get_space(area_size);
 200     if (!mb)
 201         return NULL;
 202     size1 = area_size - size;
 203     if (size1 > 0) {
 204         /* create a new free block */
 205         mb1 = (MemoryBlock *)((uint8_t *)mb + size);
 206         mb1->next = NULL;
 207         mb1->size = size1;
 208         *pmb = mb1;
 209     }
 210     goto the_end;
 211  found:
 212     /* a free block was found: use it */
 213     size1 = mb->size - size;
 214     if (size1 > 0) {
 215         /* create a new free block */
 216         mb1 = (MemoryBlock *)((uint8_t *)mb + size);
 217         mb1->next = mb->next;
 218         mb1->size = size1;
 219         *pmb = mb1;
 220     } else {
 221         /* suppress the first block */
 222         *pmb = mb->next;
 223     }
 224  the_end:
 225     mb->size = size;
 226     mb->next = NULL;
 227     ptr = ((uint8_t *)mb + BLOCK_HEADER_SIZE);
 228 #ifdef DEBUG_MALLOC
 229     qemu_printf("malloc: size=0x%x ptr=0x%lx\n", size, (unsigned long)ptr);
 230 #endif
 231     return ptr;
 232 }
 233
 234 void qemu_free(void *ptr)
 235 {
 236     MemoryBlock *mb;
 237
 238     if (!ptr)
 239         return;
 240     mb = (MemoryBlock *)((uint8_t *)ptr - BLOCK_HEADER_SIZE);
 241     mb->next = first_free_block;
 242     first_free_block = mb;
 243 }
 244
 245 /****************************************************************/
 246 /* virtual memory allocation */
 247
 248 unsigned long mmap_addr = PHYS_RAM_BASE;
 249
 250 void *get_mmap_addr(unsigned long size)
 251 {
 252     unsigned long addr;
 253     addr = mmap_addr;
 254     mmap_addr += ((size + 4095) & ~4095) + 4096;
 255     return (void *)addr;
 256 }
 257
 258 #else
 259
 260 int qemu_write(int fd, const void *buf, size_t n)
 261 {
 262     int ret;
 263     ret = write(fd, buf, n);
 264     if (ret < 0)
 265         return -errno;
 266     else
 267         return ret;
 268 }
 269
 270 void *get_mmap_addr(unsigned long size)
 271 {
 272     return NULL;
 273 }
 274
 275 void qemu_free(void *ptr)
 276 {
 277     free(ptr);
 278 }
 279
 280 void *qemu_malloc(size_t size)
 281 {
 282     return malloc(size);
 283 }
 284
 285 #endif
 286
 287 void *qemu_mallocz(size_t size)
 288 {
 289     void *ptr;
 290     ptr = qemu_malloc(size);
 291     if (!ptr)
 292         return NULL;
 293     memset(ptr, 0, size);
 294     return ptr;
 295 }
 296
 297 /****************************************************************/
 298 /* printf support */
 299
 300 static inline int qemu_isdigit(int c)
 301 {
 302     return c >= '0' && c <= '9';
 303 }
 304
 305 #define OUTCHAR(c)      (buflen > 0? (--buflen, *buf++ = (c)): 0)
 306
 307 /* from BSD ppp sources */
 308 int qemu_vsnprintf(char *buf, int buflen, const char *fmt, va_list args)
 309 {
 310     int c, i, n;
 311     int width, prec, fillch;
 312     int base, len, neg;
 313     unsigned long val = 0;
 314     const char *f;
 315     char *str, *buf0;
 316     char num[32];
 317     static const char hexchars[] = "0123456789abcdef";
 318
 319     buf0 = buf;
 320     --buflen;
 321     while (buflen > 0) {
 322         for (f = fmt; *f != '%' && *f != 0; ++f)
 323             ;
 324         if (f > fmt) {
 325             len = f - fmt;
 326             if (len > buflen)
 327                 len = buflen;
 328             memcpy(buf, fmt, len);
 329             buf += len;
 330             buflen -= len;
 331             fmt = f;
 332         }
 333         if (*fmt == 0)
 334             break;
 335         c = *++fmt;
 336         width = prec = 0;
 337         fillch = ' ';
 338         if (c == '0') {
 339             fillch = '0';
 340             c = *++fmt;
 341         }
 342         if (c == '*') {
 343             width = va_arg(args, int);
 344             c = *++fmt;
 345         } else {
 346             while (qemu_isdigit(c)) {
 347                 width = width * 10 + c - '0';
 348                 c = *++fmt;
 349             }
 350         }
 351         if (c == '.') {
 352             c = *++fmt;
 353             if (c == '*') {
 354                 prec = va_arg(args, int);
 355                 c = *++fmt;
 356             } else {
 357                 while (qemu_isdigit(c)) {
 358                     prec = prec * 10 + c - '0';
 359                     c = *++fmt;
 360                 }
 361             }
 362         }
 363         /* modifiers */
 364         switch(c) {
 365         case 'l':
 366             c = *++fmt;
 367             break;
 368         default:
 369             break;
 370         }
 371         str = 0;
 372         base = 0;
 373         neg = 0;
 374         ++fmt;
 375         switch (c) {
 376         case 'd':
 377             i = va_arg(args, int);
 378             if (i < 0) {
 379                 neg = 1;
 380                 val = -i;
 381             } else
 382                 val = i;
 383             base = 10;
 384             break;
 385         case 'o':
 386             val = va_arg(args, unsigned int);
 387             base = 8;
 388             break;
 389         case 'x':
 390         case 'X':
 391             val = va_arg(args, unsigned int);
 392             base = 16;
 393             break;
 394         case 'p':
 395             val = (unsigned long) va_arg(args, void *);
 396             base = 16;
 397             neg = 2;
 398             break;
 399         case 's':
 400             str = va_arg(args, char *);
 401             break;
 402         case 'c':
 403             num[0] = va_arg(args, int);
 404             num[1] = 0;
 405             str = num;
 406             break;
 407         default:
 408             *buf++ = '%';
 409             if (c != '%')
 410                 --fmt;          /* so %z outputs %z etc. */
 411             --buflen;
 412             continue;
 413         }
 414         if (base != 0) {
 415             str = num + sizeof(num);
 416             *--str = 0;
 417             while (str > num + neg) {
 418                 *--str = hexchars[val % base];
 419                 val = val / base;
 420                 if (--prec <= 0 && val == 0)
 421                     break;
 422             }
 423             switch (neg) {
 424             case 1:
 425                 *--str = '-';
 426                 break;
 427             case 2:
 428                 *--str = 'x';
 429                 *--str = '0';
 430                 break;
 431             }
 432             len = num + sizeof(num) - 1 - str;
 433         } else {
 434             len = strlen(str);
 435             if (prec > 0 && len > prec)
 436                 len = prec;
 437         }
 438         if (width > 0) {
 439             if (width > buflen)
 440                 width = buflen;
 441             if ((n = width - len) > 0) {
 442                 buflen -= n;
 443                 for (; n > 0; --n)
 444                     *buf++ = fillch;
 445             }
 446         }
 447         if (len > buflen)
 448             len = buflen;
 449         memcpy(buf, str, len);
 450         buf += len;
 451         buflen -= len;
 452     }
 453     *buf = 0;
 454     return buf - buf0;
 455 }
 456
 457 void qemu_vprintf(const char *fmt, va_list ap)
 458 {
 459     char buf[1024];
 460     int len;
 461
 462     len = qemu_vsnprintf(buf, sizeof(buf), fmt, ap);
 463     qemu_write(1, buf, len);
 464 }
 465
 466 void qemu_printf(const char *fmt, ...)
 467 {
 468     va_list ap;
 469     va_start(ap, fmt);
 470     qemu_vprintf(fmt, ap);
 471     va_end(ap);
 472 }
 473