root / hw / magic-load.c @ 8d5f07fa
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#include "vl.h" |
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#include "disas.h" |
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#define ELF_CLASS ELFCLASS32
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#define ELF_DATA ELFDATA2MSB
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#define ELF_ARCH EM_SPARC
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#include "elf.h" |
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#ifdef BSWAP_NEEDED
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static void bswap_ehdr(Elf32_Ehdr *ehdr) |
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{ |
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bswap16s(&ehdr->e_type); /* Object file type */
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bswap16s(&ehdr->e_machine); /* Architecture */
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bswap32s(&ehdr->e_version); /* Object file version */
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bswap32s(&ehdr->e_entry); /* Entry point virtual address */
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bswap32s(&ehdr->e_phoff); /* Program header table file offset */
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bswap32s(&ehdr->e_shoff); /* Section header table file offset */
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bswap32s(&ehdr->e_flags); /* Processor-specific flags */
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bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
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bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
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bswap16s(&ehdr->e_phnum); /* Program header table entry count */
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bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
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bswap16s(&ehdr->e_shnum); /* Section header table entry count */
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bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
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} |
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static void bswap_phdr(Elf32_Phdr *phdr) |
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{ |
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bswap32s(&phdr->p_type); /* Segment type */
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bswap32s(&phdr->p_offset); /* Segment file offset */
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bswap32s(&phdr->p_vaddr); /* Segment virtual address */
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bswap32s(&phdr->p_paddr); /* Segment physical address */
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bswap32s(&phdr->p_filesz); /* Segment size in file */
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bswap32s(&phdr->p_memsz); /* Segment size in memory */
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bswap32s(&phdr->p_flags); /* Segment flags */
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bswap32s(&phdr->p_align); /* Segment alignment */
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} |
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static void bswap_shdr(Elf32_Shdr *shdr) |
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{ |
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bswap32s(&shdr->sh_name); |
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bswap32s(&shdr->sh_type); |
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bswap32s(&shdr->sh_flags); |
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bswap32s(&shdr->sh_addr); |
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bswap32s(&shdr->sh_offset); |
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bswap32s(&shdr->sh_size); |
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bswap32s(&shdr->sh_link); |
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bswap32s(&shdr->sh_info); |
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bswap32s(&shdr->sh_addralign); |
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bswap32s(&shdr->sh_entsize); |
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} |
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static void bswap_sym(Elf32_Sym *sym) |
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{ |
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bswap32s(&sym->st_name); |
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bswap32s(&sym->st_value); |
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bswap32s(&sym->st_size); |
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bswap16s(&sym->st_shndx); |
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} |
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#else
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#define bswap_ehdr(e) do { } while (0) |
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#define bswap_phdr(e) do { } while (0) |
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#define bswap_shdr(e) do { } while (0) |
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#define bswap_sym(e) do { } while (0) |
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#endif
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static int find_phdr(struct elfhdr *ehdr, int fd, struct elf_phdr *phdr, uint32_t type) |
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{ |
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int i, retval;
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retval = lseek(fd, ehdr->e_phoff, SEEK_SET); |
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if (retval < 0) |
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return -1; |
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for (i = 0; i < ehdr->e_phnum; i++) { |
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retval = read(fd, phdr, sizeof(*phdr));
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if (retval < 0) |
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return -1; |
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bswap_phdr(phdr); |
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if (phdr->p_type == type)
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return 0; |
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} |
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return -1; |
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} |
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static void *find_shdr(struct elfhdr *ehdr, int fd, struct elf_shdr *shdr, uint32_t type) |
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{ |
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int i, retval;
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retval = lseek(fd, ehdr->e_shoff, SEEK_SET); |
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if (retval < 0) |
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return NULL; |
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for (i = 0; i < ehdr->e_shnum; i++) { |
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retval = read(fd, shdr, sizeof(*shdr));
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if (retval < 0) |
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return NULL; |
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bswap_shdr(shdr); |
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if (shdr->sh_type == type)
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return qemu_malloc(shdr->sh_size);
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} |
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return NULL; |
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} |
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static int find_strtab(struct elfhdr *ehdr, int fd, struct elf_shdr *shdr, struct elf_shdr *symtab) |
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{ |
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int retval;
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retval = lseek(fd, ehdr->e_shoff + sizeof(struct elf_shdr) * symtab->sh_link, SEEK_SET); |
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if (retval < 0) |
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return -1; |
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retval = read(fd, shdr, sizeof(*shdr));
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if (retval < 0) |
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return -1; |
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bswap_shdr(shdr); |
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if (shdr->sh_type == SHT_STRTAB)
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return qemu_malloc(shdr->sh_size);;
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return 0; |
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} |
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static int read_program(int fd, struct elf_phdr *phdr, void *dst) |
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{ |
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int retval;
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retval = lseek(fd, 0x4000, SEEK_SET);
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if (retval < 0) |
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return -1; |
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return read(fd, dst, phdr->p_filesz);
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} |
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static int read_section(int fd, struct elf_shdr *s, void *dst) |
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{ |
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int retval;
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retval = lseek(fd, s->sh_offset, SEEK_SET); |
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if (retval < 0) |
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return -1; |
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retval = read(fd, dst, s->sh_size); |
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if (retval < 0) |
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return -1; |
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return 0; |
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} |
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static void *process_section(struct elfhdr *ehdr, int fd, struct elf_shdr *shdr, uint32_t type) |
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{ |
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void *dst;
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dst = find_shdr(ehdr, fd, shdr, type); |
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if (!dst)
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goto error;
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if (read_section(fd, shdr, dst))
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goto error;
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return dst;
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error:
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qemu_free(dst); |
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return NULL; |
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} |
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static void *process_strtab(struct elfhdr *ehdr, int fd, struct elf_shdr *shdr, struct elf_shdr *symtab) |
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{ |
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void *dst;
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dst = find_strtab(ehdr, fd, shdr, symtab); |
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if (!dst)
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goto error;
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if (read_section(fd, shdr, dst))
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goto error;
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return dst;
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error:
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qemu_free(dst); |
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return NULL; |
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} |
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static void load_symbols(struct elfhdr *ehdr, int fd) |
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{ |
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struct elf_shdr symtab, strtab;
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struct elf_sym *syms;
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int nsyms, i;
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char *str;
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/* Symbol table */
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syms = process_section(ehdr, fd, &symtab, SHT_SYMTAB); |
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if (!syms)
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return;
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nsyms = symtab.sh_size / sizeof(struct elf_sym); |
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for (i = 0; i < nsyms; i++) |
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bswap_sym(&syms[i]); |
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/* String table */
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str = process_strtab(ehdr, fd, &strtab, &symtab); |
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if (!str)
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goto error_freesyms;
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/* Commit */
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if (disas_symtab)
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qemu_free(disas_symtab); /* XXX Merge with old symbols? */
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if (disas_strtab)
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qemu_free(disas_strtab); |
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disas_symtab = syms; |
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disas_num_syms = nsyms; |
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disas_strtab = str; |
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return;
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error_freesyms:
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qemu_free(syms); |
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return;
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} |
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int load_elf(const char * filename, uint8_t *addr) |
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{ |
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struct elfhdr ehdr;
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struct elf_phdr phdr;
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int retval, fd;
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fd = open(filename, O_RDONLY | O_BINARY); |
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if (fd < 0) |
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goto error;
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retval = read(fd, &ehdr, sizeof(ehdr));
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if (retval < 0) |
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goto error;
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bswap_ehdr(&ehdr); |
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if (ehdr.e_ident[0] != 0x7f || ehdr.e_ident[1] != 'E' |
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|| ehdr.e_ident[2] != 'L' || ehdr.e_ident[3] != 'F' |
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|| ehdr.e_machine != EM_SPARC) |
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goto error;
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if (find_phdr(&ehdr, fd, &phdr, PT_LOAD))
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goto error;
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retval = read_program(fd, &phdr, addr); |
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if (retval < 0) |
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goto error;
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load_symbols(&ehdr, fd); |
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close(fd); |
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return retval;
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error:
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close(fd); |
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return -1; |
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} |
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int load_kernel(const char *filename, uint8_t *addr) |
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{ |
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int fd, size;
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fd = open(filename, O_RDONLY | O_BINARY); |
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if (fd < 0) |
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return -1; |
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/* load 32 bit code */
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size = read(fd, addr, 16 * 1024 * 1024); |
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if (size < 0) |
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goto fail;
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close(fd); |
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return size;
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fail:
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close(fd); |
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return -1; |
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} |
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typedef struct MAGICState { |
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uint32_t addr; |
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uint32_t saved_addr; |
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int magic_state;
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char saved_kfn[1024]; |
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} MAGICState; |
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static uint32_t magic_mem_readl(void *opaque, target_phys_addr_t addr) |
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{ |
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int ret;
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MAGICState *s = opaque; |
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if (s->magic_state == 0) { |
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ret = load_elf(s->saved_kfn, (uint8_t *)s->saved_addr); |
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if (ret < 0) |
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ret = load_kernel(s->saved_kfn, (uint8_t *)s->saved_addr); |
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if (ret < 0) { |
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fprintf(stderr, "qemu: could not load kernel '%s'\n",
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s->saved_kfn); |
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} |
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s->magic_state = 1; /* No more magic */ |
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tb_flush(); |
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return bswap32(ret);
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} |
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return 0; |
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} |
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static void magic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val) |
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{ |
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} |
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static CPUReadMemoryFunc *magic_mem_read[3] = { |
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magic_mem_readl, |
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magic_mem_readl, |
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magic_mem_readl, |
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}; |
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static CPUWriteMemoryFunc *magic_mem_write[3] = { |
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magic_mem_writel, |
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magic_mem_writel, |
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magic_mem_writel, |
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}; |
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void magic_init(const char *kfn, int kloadaddr, uint32_t addr) |
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{ |
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int magic_io_memory;
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MAGICState *s; |
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s = qemu_mallocz(sizeof(MAGICState));
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if (!s)
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return;
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strcpy(s->saved_kfn, kfn); |
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s->saved_addr = kloadaddr; |
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s->magic_state = 0;
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s->addr = addr; |
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magic_io_memory = cpu_register_io_memory(0, magic_mem_read, magic_mem_write, s);
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cpu_register_physical_memory(addr, 4, magic_io_memory);
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} |
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