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 "qemu-common.h"
  25 #include "disas.h"
  26 #include "sysemu.h"
  27 #include "uboot_image.h"
  28
  29 /* return the size or -1 if error */
  30 int get_image_size(const char *filename)
  31 {
  32     int fd, size;
  33     fd = open(filename, O_RDONLY | O_BINARY);
  34     if (fd < 0)
  35         return -1;
  36     size = lseek(fd, 0, SEEK_END);
  37     close(fd);
  38     return size;
  39 }
  40
  41 /* return the size or -1 if error */
  42 int load_image(const char *filename, uint8_t *addr)
  43 {
  44     int fd, size;
  45     fd = open(filename, O_RDONLY | O_BINARY);
  46     if (fd < 0)
  47         return -1;
  48     size = lseek(fd, 0, SEEK_END);
  49     lseek(fd, 0, SEEK_SET);
  50     if (read(fd, addr, size) != size) {
  51         close(fd);
  52         return -1;
  53     }
  54     close(fd);
  55     return size;
  56 }
  57
  58 /* A.OUT loader */
  59
  60 struct exec
  61 {
  62   uint32_t a_info;   /* Use macros N_MAGIC, etc for access */
  63   uint32_t a_text;   /* length of text, in bytes */
  64   uint32_t a_data;   /* length of data, in bytes */
  65   uint32_t a_bss;    /* length of uninitialized data area, in bytes */
  66   uint32_t a_syms;   /* length of symbol table data in file, in bytes */
  67   uint32_t a_entry;  /* start address */
  68   uint32_t a_trsize; /* length of relocation info for text, in bytes */
  69   uint32_t a_drsize; /* length of relocation info for data, in bytes */
  70 };
  71
  72 #ifdef BSWAP_NEEDED
  73 static void bswap_ahdr(struct exec *e)
  74 {
  75     bswap32s(&e->a_info);
  76     bswap32s(&e->a_text);
  77     bswap32s(&e->a_data);
  78     bswap32s(&e->a_bss);
  79     bswap32s(&e->a_syms);
  80     bswap32s(&e->a_entry);
  81     bswap32s(&e->a_trsize);
  82     bswap32s(&e->a_drsize);
  83 }
  84 #else
  85 #define bswap_ahdr(x) do { } while (0)
  86 #endif
  87
  88 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
  89 #define OMAGIC 0407
  90 #define NMAGIC 0410
  91 #define ZMAGIC 0413
  92 #define QMAGIC 0314
  93 #define _N_HDROFF(x) (1024 - sizeof (struct exec))
  94 #define N_TXTOFF(x)                                                     \
  95     (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) :     \
  96      (N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec)))
  97 #define N_TXTADDR(x) (N_MAGIC(x) == QMAGIC ? TARGET_PAGE_SIZE : 0)
  98 #define N_DATOFF(x) (N_TXTOFF(x) + (x).a_text)
  99 #define _N_SEGMENT_ROUND(x) (((x) + TARGET_PAGE_SIZE - 1) & ~(TARGET_PAGE_SIZE - 1))
 100
 101 #define _N_TXTENDADDR(x) (N_TXTADDR(x)+(x).a_text)
 102
 103 #define N_DATADDR(x) \
 104     (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x)) \
 105      : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x))))
 106
 107
 108 int load_aout(const char *filename, uint8_t *addr)
 109 {
 110     int fd, size, ret;
 111     struct exec e;
 112     uint32_t magic;
 113
 114     fd = open(filename, O_RDONLY | O_BINARY);
 115     if (fd < 0)
 116         return -1;
 117
 118     size = read(fd, &e, sizeof(e));
 119     if (size < 0)
 120         goto fail;
 121
 122     bswap_ahdr(&e);
 123
 124     magic = N_MAGIC(e);
 125     switch (magic) {
 126     case ZMAGIC:
 127     case QMAGIC:
 128     case OMAGIC:
 129         lseek(fd, N_TXTOFF(e), SEEK_SET);
 130         size = read(fd, addr, e.a_text + e.a_data);
 131         if (size < 0)
 132             goto fail;
 133         break;
 134     case NMAGIC:
 135         lseek(fd, N_TXTOFF(e), SEEK_SET);
 136         size = read(fd, addr, e.a_text);
 137         if (size < 0)
 138             goto fail;
 139         ret = read(fd, addr + N_DATADDR(e), e.a_data);
 140         if (ret < 0)
 141             goto fail;
 142         size += ret;
 143         break;
 144     default:
 145         goto fail;
 146     }
 147     close(fd);
 148     return size;
 149  fail:
 150     close(fd);
 151     return -1;
 152 }
 153
 154 /* ELF loader */
 155
 156 static void *load_at(int fd, int offset, int size)
 157 {
 158     void *ptr;
 159     if (lseek(fd, offset, SEEK_SET) < 0)
 160         return NULL;
 161     ptr = qemu_malloc(size);
 162     if (!ptr)
 163         return NULL;
 164     if (read(fd, ptr, size) != size) {
 165         qemu_free(ptr);
 166         return NULL;
 167     }
 168     return ptr;
 169 }
 170
 171
 172 #define ELF_CLASS   ELFCLASS32
 173 #include "elf.h"
 174
 175 #define SZ              32
 176 #define elf_word        uint32_t
 177 #define elf_sword        int32_t
 178 #define bswapSZs        bswap32s
 179 #include "elf_ops.h"
 180
 181 #undef elfhdr
 182 #undef elf_phdr
 183 #undef elf_shdr
 184 #undef elf_sym
 185 #undef elf_note
 186 #undef elf_word
 187 #undef elf_sword
 188 #undef bswapSZs
 189 #undef SZ
 190 #define elfhdr          elf64_hdr
 191 #define elf_phdr        elf64_phdr
 192 #define elf_note        elf64_note
 193 #define elf_shdr        elf64_shdr
 194 #define elf_sym         elf64_sym
 195 #define elf_word        uint64_t
 196 #define elf_sword        int64_t
 197 #define bswapSZs        bswap64s
 198 #define SZ              64
 199 #include "elf_ops.h"
 200
 201 /* return < 0 if error, otherwise the number of bytes loaded in memory */
 202 int load_elf(const char *filename, int64_t virt_to_phys_addend,
 203              uint64_t *pentry, uint64_t *lowaddr, uint64_t *highaddr)
 204 {
 205     int fd, data_order, host_data_order, must_swab, ret;
 206     uint8_t e_ident[EI_NIDENT];
 207
 208     fd = open(filename, O_RDONLY | O_BINARY);
 209     if (fd < 0) {
 210         perror(filename);
 211         return -1;
 212     }
 213     if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
 214         goto fail;
 215     if (e_ident[0] != ELFMAG0 ||
 216         e_ident[1] != ELFMAG1 ||
 217         e_ident[2] != ELFMAG2 ||
 218         e_ident[3] != ELFMAG3)
 219         goto fail;
 220 #ifdef WORDS_BIGENDIAN
 221     data_order = ELFDATA2MSB;
 222 #else
 223     data_order = ELFDATA2LSB;
 224 #endif
 225     must_swab = data_order != e_ident[EI_DATA];
 226
 227 #ifdef TARGET_WORDS_BIGENDIAN
 228     host_data_order = ELFDATA2MSB;
 229 #else
 230     host_data_order = ELFDATA2LSB;
 231 #endif
 232     if (host_data_order != e_ident[EI_DATA])
 233         return -1;
 234
 235     lseek(fd, 0, SEEK_SET);
 236     if (e_ident[EI_CLASS] == ELFCLASS64) {
 237         ret = load_elf64(fd, virt_to_phys_addend, must_swab, pentry,
 238                          lowaddr, highaddr);
 239     } else {
 240         ret = load_elf32(fd, virt_to_phys_addend, must_swab, pentry,
 241                          lowaddr, highaddr);
 242     }
 243
 244     close(fd);
 245     return ret;
 246
 247  fail:
 248     close(fd);
 249     return -1;
 250 }
 251
 252 static void bswap_uboot_header(uboot_image_header_t *hdr)
 253 {
 254 #ifndef WORDS_BIGENDIAN
 255     bswap32s(&hdr->ih_magic);
 256     bswap32s(&hdr->ih_hcrc);
 257     bswap32s(&hdr->ih_time);
 258     bswap32s(&hdr->ih_size);
 259     bswap32s(&hdr->ih_load);
 260     bswap32s(&hdr->ih_ep);
 261     bswap32s(&hdr->ih_dcrc);
 262 #endif
 263 }
 264
 265 /* Load a U-Boot image.  */
 266 int load_uboot(const char *filename, target_ulong *ep, int *is_linux)
 267 {
 268
 269     int fd;
 270     int size;
 271     uboot_image_header_t h;
 272     uboot_image_header_t *hdr = &h;
 273     uint8_t *data = NULL;
 274
 275     fd = open(filename, O_RDONLY | O_BINARY);
 276     if (fd < 0)
 277         return -1;
 278
 279     size = read(fd, hdr, sizeof(uboot_image_header_t));
 280     if (size < 0)
 281         goto fail;
 282
 283     bswap_uboot_header(hdr);
 284
 285     if (hdr->ih_magic != IH_MAGIC)
 286         goto fail;
 287
 288     /* TODO: Implement Multi-File images.  */
 289     if (hdr->ih_type == IH_TYPE_MULTI) {
 290         fprintf(stderr, "Unable to load multi-file u-boot images\n");
 291         goto fail;
 292     }
 293
 294     /* TODO: Implement compressed images.  */
 295     if (hdr->ih_comp != IH_COMP_NONE) {
 296         fprintf(stderr, "Unable to load compressed u-boot images\n");
 297         goto fail;
 298     }
 299
 300     /* TODO: Check CPU type.  */
 301     if (is_linux) {
 302         if (hdr->ih_type == IH_TYPE_KERNEL && hdr->ih_os == IH_OS_LINUX)
 303             *is_linux = 1;
 304         else
 305             *is_linux = 0;
 306     }
 307
 308     *ep = hdr->ih_ep;
 309     data = qemu_malloc(hdr->ih_size);
 310     if (!data)
 311         goto fail;
 312
 313     if (read(fd, data, hdr->ih_size) != hdr->ih_size) {
 314         fprintf(stderr, "Error reading file\n");
 315         goto fail;
 316     }
 317
 318     cpu_physical_memory_write_rom(hdr->ih_load, data, hdr->ih_size);
 319
 320     return hdr->ih_size;
 321
 322 fail:
 323     if (data)
 324         qemu_free(data);
 325     close(fd);
 326     return -1;
 327 }