loader.c

   1 /*
   2  * QEMU Executable loader
   3  *
   4  * Copyright (c) 2006 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 "vl.h"
  25 #include "disas.h"
  26 #include "uboot_image.h"
  27
  28 /* return the size or -1 if error */
  29 int get_image_size(const char *filename)
  30 {
  31     int fd, size;
  32     fd = open(filename, O_RDONLY | O_BINARY);
  33     if (fd < 0)
  34         return -1;
  35     size = lseek(fd, 0, SEEK_END);
  36     close(fd);
  37     return size;
  38 }
  39
  40 /* return the size or -1 if error */
  41 int load_image(const char *filename, uint8_t *addr)
  42 {
  43     int fd, size;
  44     fd = open(filename, O_RDONLY | O_BINARY);
  45     if (fd < 0)
  46         return -1;
  47     size = lseek(fd, 0, SEEK_END);
  48     lseek(fd, 0, SEEK_SET);
  49     if (read(fd, addr, size) != size) {
  50         close(fd);
  51         return -1;
  52     }
  53     close(fd);
  54     return size;
  55 }
  56
  57 /* A.OUT loader */
  58
  59 struct exec
  60 {
  61   uint32_t a_info;   /* Use macros N_MAGIC, etc for access */
  62   uint32_t a_text;   /* length of text, in bytes */
  63   uint32_t a_data;   /* length of data, in bytes */
  64   uint32_t a_bss;    /* length of uninitialized data area, in bytes */
  65   uint32_t a_syms;   /* length of symbol table data in file, in bytes */
  66   uint32_t a_entry;  /* start address */
  67   uint32_t a_trsize; /* length of relocation info for text, in bytes */
  68   uint32_t a_drsize; /* length of relocation info for data, in bytes */
  69 };
  70
  71 #ifdef BSWAP_NEEDED
  72 static void bswap_ahdr(struct exec *e)
  73 {
  74     bswap32s(&e->a_info);
  75     bswap32s(&e->a_text);
  76     bswap32s(&e->a_data);
  77     bswap32s(&e->a_bss);
  78     bswap32s(&e->a_syms);
  79     bswap32s(&e->a_entry);
  80     bswap32s(&e->a_trsize);
  81     bswap32s(&e->a_drsize);
  82 }
  83 #else
  84 #define bswap_ahdr(x) do { } while (0)
  85 #endif
  86
  87 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
  88 #define OMAGIC 0407
  89 #define NMAGIC 0410
  90 #define ZMAGIC 0413
  91 #define QMAGIC 0314
  92 #define _N_HDROFF(x) (1024 - sizeof (struct exec))
  93 #define N_TXTOFF(x)                                                     \
  94     (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) :     \
  95      (N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec)))
  96 #define N_TXTADDR(x) (N_MAGIC(x) == QMAGIC ? TARGET_PAGE_SIZE : 0)
  97 #define N_DATOFF(x) (N_TXTOFF(x) + (x).a_text)
  98 #define _N_SEGMENT_ROUND(x) (((x) + TARGET_PAGE_SIZE - 1) & ~(TARGET_PAGE_SIZE - 1))
  99
 100 #define _N_TXTENDADDR(x) (N_TXTADDR(x)+(x).a_text)
 101
 102 #define N_DATADDR(x) \
 103     (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x)) \
 104      : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x))))
 105
 106
 107 int load_aout(const char *filename, uint8_t *addr)
 108 {
 109     int fd, size, ret;
 110     struct exec e;
 111     uint32_t magic;
 112
 113     fd = open(filename, O_RDONLY | O_BINARY);
 114     if (fd < 0)
 115         return -1;
 116
 117     size = read(fd, &e, sizeof(e));
 118     if (size < 0)
 119         goto fail;
 120
 121     bswap_ahdr(&e);
 122
 123     magic = N_MAGIC(e);
 124     switch (magic) {
 125     case ZMAGIC:
 126     case QMAGIC:
 127     case OMAGIC:
 128         lseek(fd, N_TXTOFF(e), SEEK_SET);
 129         size = read(fd, addr, e.a_text + e.a_data);
 130         if (size < 0)
 131             goto fail;
 132         break;
 133     case NMAGIC:
 134         lseek(fd, N_TXTOFF(e), SEEK_SET);
 135         size = read(fd, addr, e.a_text);
 136         if (size < 0)
 137             goto fail;
 138         ret = read(fd, addr + N_DATADDR(e), e.a_data);
 139         if (ret < 0)
 140             goto fail;
 141         size += ret;
 142         break;
 143     default:
 144         goto fail;
 145     }
 146     close(fd);
 147     return size;
 148  fail:
 149     close(fd);
 150     return -1;
 151 }
 152
 153 /* ELF loader */
 154
 155 static void *load_at(int fd, int offset, int size)
 156 {
 157     void *ptr;
 158     if (lseek(fd, offset, SEEK_SET) < 0)
 159         return NULL;
 160     ptr = qemu_malloc(size);
 161     if (!ptr)
 162         return NULL;
 163     if (read(fd, ptr, size) != size) {
 164         qemu_free(ptr);
 165         return NULL;
 166     }
 167     return ptr;
 168 }
 169
 170
 171 #define ELF_CLASS   ELFCLASS32
 172 #include "elf.h"
 173
 174 #define SZ              32
 175 #define elf_word        uint32_t
 176 #define bswapSZs        bswap32s
 177 #include "elf_ops.h"
 178
 179 #undef elfhdr
 180 #undef elf_phdr
 181 #undef elf_shdr
 182 #undef elf_sym
 183 #undef elf_note
 184 #undef elf_word
 185 #undef bswapSZs
 186 #undef SZ
 187 #define elfhdr          elf64_hdr
 188 #define elf_phdr        elf64_phdr
 189 #define elf_note        elf64_note
 190 #define elf_shdr        elf64_shdr
 191 #define elf_sym         elf64_sym
 192 #define elf_word        uint64_t
 193 #define bswapSZs        bswap64s
 194 #define SZ              64
 195 #include "elf_ops.h"
 196
 197 /* return < 0 if error, otherwise the number of bytes loaded in memory */
 198 int load_elf(const char *filename, int64_t virt_to_phys_addend,
 199              uint64_t *pentry, uint64_t *lowaddr, uint64_t *highaddr)
 200 {
 201     int fd, data_order, host_data_order, must_swab, ret;
 202     uint8_t e_ident[EI_NIDENT];
 203
 204     fd = open(filename, O_RDONLY | O_BINARY);
 205     if (fd < 0) {
 206         perror(filename);
 207         return -1;
 208     }
 209     if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
 210         goto fail;
 211     if (e_ident[0] != ELFMAG0 ||
 212         e_ident[1] != ELFMAG1 ||
 213         e_ident[2] != ELFMAG2 ||
 214         e_ident[3] != ELFMAG3)
 215         goto fail;
 216 #ifdef WORDS_BIGENDIAN
 217     data_order = ELFDATA2MSB;
 218 #else
 219     data_order = ELFDATA2LSB;
 220 #endif
 221     must_swab = data_order != e_ident[EI_DATA];
 222
 223 #ifdef TARGET_WORDS_BIGENDIAN
 224     host_data_order = ELFDATA2MSB;
 225 #else
 226     host_data_order = ELFDATA2LSB;
 227 #endif
 228     if (host_data_order != e_ident[EI_DATA])
 229         return -1;
 230
 231     lseek(fd, 0, SEEK_SET);
 232     if (e_ident[EI_CLASS] == ELFCLASS64) {
 233         ret = load_elf64(fd, virt_to_phys_addend, must_swab, pentry,
 234                          lowaddr, highaddr);
 235     } else {
 236         ret = load_elf32(fd, virt_to_phys_addend, must_swab, pentry,
 237                          lowaddr, highaddr);
 238     }
 239
 240     close(fd);
 241     return ret;
 242
 243  fail:
 244     close(fd);
 245     return -1;
 246 }
 247
 248 static void bswap_uboot_header(uboot_image_header_t *hdr)
 249 {
 250 #ifndef WORDS_BIGENDIAN
 251     bswap32s(&hdr->ih_magic);
 252     bswap32s(&hdr->ih_hcrc);
 253     bswap32s(&hdr->ih_time);
 254     bswap32s(&hdr->ih_size);
 255     bswap32s(&hdr->ih_load);
 256     bswap32s(&hdr->ih_ep);
 257     bswap32s(&hdr->ih_dcrc);
 258 #endif
 259 }
 260
 261 /* Load a U-Boot image.  */
 262 int load_uboot(const char *filename, target_ulong *ep, int *is_linux)
 263 {
 264
 265     int fd;
 266     int size;
 267     uboot_image_header_t h;
 268     uboot_image_header_t *hdr = &h;
 269     uint8_t *data = NULL;
 270
 271     fd = open(filename, O_RDONLY | O_BINARY);
 272     if (fd < 0)
 273         return -1;
 274
 275     size = read(fd, hdr, sizeof(uboot_image_header_t));
 276     if (size < 0)
 277         goto fail;
 278
 279     bswap_uboot_header(hdr);
 280
 281     if (hdr->ih_magic != IH_MAGIC)
 282         goto fail;
 283
 284     /* TODO: Implement Multi-File images.  */
 285     if (hdr->ih_type == IH_TYPE_MULTI) {
 286         fprintf(stderr, "Unable to load multi-file u-boot images\n");
 287         goto fail;
 288     }
 289
 290     /* TODO: Implement compressed images.  */
 291     if (hdr->ih_comp != IH_COMP_NONE) {
 292         fprintf(stderr, "Unable to load compressed u-boot images\n");
 293         goto fail;
 294     }
 295
 296     /* TODO: Check CPU type.  */
 297     if (is_linux) {
 298         if (hdr->ih_type == IH_TYPE_KERNEL && hdr->ih_os == IH_OS_LINUX)
 299             *is_linux = 1;
 300         else
 301             *is_linux = 0;
 302     }
 303
 304     *ep = hdr->ih_ep;
 305     data = qemu_malloc(hdr->ih_size);
 306     if (!data)
 307         goto fail;
 308
 309     if (read(fd, data, hdr->ih_size) != hdr->ih_size) {
 310         fprintf(stderr, "Error reading file\n");
 311         goto fail;
 312     }
 313
 314     cpu_physical_memory_write_rom(hdr->ih_load, data, hdr->ih_size);
 315
 316     return hdr->ih_size;
 317
 318 fail:
 319     if (data)
 320         qemu_free(data);
 321     close(fd);
 322     return -1;
 323 }