diff options
Diffstat (limited to 'loader.c')
| -rw-r--r-- | loader.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/loader.c b/loader.c new file mode 100644 index 0000000000..c4bde55c13 --- /dev/null +++ b/loader.c @@ -0,0 +1,234 @@ +/* + * QEMU Executable loader + * + * Copyright (c) 2006 Fabrice Bellard + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ +#include "vl.h" +#include "disas.h" + +/* return the size or -1 if error */ +int get_image_size(const char *filename) +{ + int fd, size; + fd = open(filename, O_RDONLY | O_BINARY); + if (fd < 0) + return -1; + size = lseek(fd, 0, SEEK_END); + close(fd); + return size; +} + +/* return the size or -1 if error */ +int load_image(const char *filename, uint8_t *addr) +{ + int fd, size; + fd = open(filename, O_RDONLY | O_BINARY); + if (fd < 0) + return -1; + size = lseek(fd, 0, SEEK_END); + lseek(fd, 0, SEEK_SET); + if (read(fd, addr, size) != size) { + close(fd); + return -1; + } + close(fd); + return size; +} + +/* A.OUT loader */ + +struct exec +{ + uint32_t a_info; /* Use macros N_MAGIC, etc for access */ + uint32_t a_text; /* length of text, in bytes */ + uint32_t a_data; /* length of data, in bytes */ + uint32_t a_bss; /* length of uninitialized data area, in bytes */ + uint32_t a_syms; /* length of symbol table data in file, in bytes */ + uint32_t a_entry; /* start address */ + uint32_t a_trsize; /* length of relocation info for text, in bytes */ + uint32_t a_drsize; /* length of relocation info for data, in bytes */ +}; + +#ifdef BSWAP_NEEDED +static void bswap_ahdr(struct exec *e) +{ + bswap32s(&e->a_info); + bswap32s(&e->a_text); + bswap32s(&e->a_data); + bswap32s(&e->a_bss); + bswap32s(&e->a_syms); + bswap32s(&e->a_entry); + bswap32s(&e->a_trsize); + bswap32s(&e->a_drsize); +} +#else +#define bswap_ahdr(x) do { } while (0) +#endif + +#define N_MAGIC(exec) ((exec).a_info & 0xffff) +#define OMAGIC 0407 +#define NMAGIC 0410 +#define ZMAGIC 0413 +#define QMAGIC 0314 +#define _N_HDROFF(x) (1024 - sizeof (struct exec)) +#define N_TXTOFF(x) \ + (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) : \ + (N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec))) +#define N_TXTADDR(x) (N_MAGIC(x) == QMAGIC ? TARGET_PAGE_SIZE : 0) +#define N_DATOFF(x) (N_TXTOFF(x) + (x).a_text) +#define _N_SEGMENT_ROUND(x) (((x) + TARGET_PAGE_SIZE - 1) & ~(TARGET_PAGE_SIZE - 1)) + +#define _N_TXTENDADDR(x) (N_TXTADDR(x)+(x).a_text) + +#define N_DATADDR(x) \ + (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x)) \ + : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x)))) + + +int load_aout(const char *filename, uint8_t *addr) +{ + int fd, size, ret; + struct exec e; + uint32_t magic; + + fd = open(filename, O_RDONLY | O_BINARY); + if (fd < 0) + return -1; + + size = read(fd, &e, sizeof(e)); + if (size < 0) + goto fail; + + bswap_ahdr(&e); + + magic = N_MAGIC(e); + switch (magic) { + case ZMAGIC: + case QMAGIC: + case OMAGIC: + lseek(fd, N_TXTOFF(e), SEEK_SET); + size = read(fd, addr, e.a_text + e.a_data); + if (size < 0) + goto fail; + break; + case NMAGIC: + lseek(fd, N_TXTOFF(e), SEEK_SET); + size = read(fd, addr, e.a_text); + if (size < 0) + goto fail; + ret = read(fd, addr + N_DATADDR(e), e.a_data); + if (ret < 0) + goto fail; + size += ret; + break; + default: + goto fail; + } + close(fd); + return size; + fail: + close(fd); + return -1; +} + +/* ELF loader */ + +static void *load_at(int fd, int offset, int size) +{ + void *ptr; + if (lseek(fd, offset, SEEK_SET) < 0) + return NULL; + ptr = qemu_malloc(size); + if (!ptr) + return NULL; + if (read(fd, ptr, size) != size) { + qemu_free(ptr); + return NULL; + } + return ptr; +} + + +#define ELF_CLASS ELFCLASS32 +#include "elf.h" + +#define SZ 32 +#define elf_word uint32_t +#define bswapSZs bswap32s +#include "elf_ops.h" + +#undef elfhdr +#undef elf_phdr +#undef elf_shdr +#undef elf_sym +#undef elf_note +#undef elf_word +#undef bswapSZs +#undef SZ +#define elfhdr elf64_hdr +#define elf_phdr elf64_phdr +#define elf_note elf64_note +#define elf_shdr elf64_shdr +#define elf_sym elf64_sym +#define elf_word uint64_t +#define bswapSZs bswap64s +#define SZ 64 +#include "elf_ops.h" + +/* return < 0 if error, otherwise the number of bytes loaded in memory */ +int load_elf(const char *filename, int64_t virt_to_phys_addend) +{ + int fd, data_order, must_swab, ret; + uint8_t e_ident[EI_NIDENT]; + + fd = open(filename, O_RDONLY); + if (fd < 0) { + perror(filename); + return -1; + } + if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident)) + goto fail; + if (e_ident[0] != ELFMAG0 || + e_ident[1] != ELFMAG1 || + e_ident[2] != ELFMAG2 || + e_ident[3] != ELFMAG3) + goto fail; +#ifdef WORDS_BIGENDIAN + data_order = ELFDATA2MSB; +#else + data_order = ELFDATA2LSB; +#endif + must_swab = data_order != e_ident[EI_DATA]; + + lseek(fd, 0, SEEK_SET); + if (e_ident[EI_CLASS] == ELFCLASS64) { + ret = load_elf64(fd, virt_to_phys_addend, must_swab); + } else { + ret = load_elf32(fd, virt_to_phys_addend, must_swab); + } + + close(fd); + return ret; + + fail: + close(fd); + return -1; +} |