Archipelago » qemu

#ifdef BSWAP_NEEDED

static void bswap_ehdr(Elf32_Ehdr *ehdr)

{

    bswap16s(&ehdr->e_type);			/* Object file type */

    bswap16s(&ehdr->e_machine);		/* Architecture */

    bswap32s(&ehdr->e_version);		/* Object file version */

    bswap32s(&ehdr->e_entry);		/* Entry point virtual address */

    bswap32s(&ehdr->e_phoff);		/* Program header table file offset */

    bswap32s(&ehdr->e_shoff);		/* Section header table file offset */

    bswap32s(&ehdr->e_flags);		/* Processor-specific flags */

    bswap16s(&ehdr->e_ehsize);		/* ELF header size in bytes */

    bswap16s(&ehdr->e_phentsize);		/* Program header table entry size */

    bswap16s(&ehdr->e_phnum);		/* Program header table entry count */

    bswap16s(&ehdr->e_shentsize);		/* Section header table entry size */

    bswap16s(&ehdr->e_shnum);		/* Section header table entry count */

    bswap16s(&ehdr->e_shstrndx);		/* Section header string table index */

}

static void bswap_phdr(Elf32_Phdr *phdr)

{

    bswap32s(&phdr->p_type);			/* Segment type */

    bswap32s(&phdr->p_offset);		/* Segment file offset */

    bswap32s(&phdr->p_vaddr);		/* Segment virtual address */

    bswap32s(&phdr->p_paddr);		/* Segment physical address */

    bswap32s(&phdr->p_filesz);		/* Segment size in file */

    bswap32s(&phdr->p_memsz);		/* Segment size in memory */

    bswap32s(&phdr->p_flags);		/* Segment flags */

    bswap32s(&phdr->p_align);		/* Segment alignment */

}

static void bswap_shdr(Elf32_Shdr *shdr)

{

    bswap32s(&shdr->sh_name);

    bswap32s(&shdr->sh_type);

    bswap32s(&shdr->sh_flags);

    bswap32s(&shdr->sh_addr);

    bswap32s(&shdr->sh_offset);

    bswap32s(&shdr->sh_size);

    bswap32s(&shdr->sh_link);

    bswap32s(&shdr->sh_info);

    bswap32s(&shdr->sh_addralign);

    bswap32s(&shdr->sh_entsize);

}

static void bswap_sym(Elf32_Sym *sym)

{

    bswap32s(&sym->st_name);

    bswap32s(&sym->st_value);

    bswap32s(&sym->st_size);

    bswap16s(&sym->st_shndx);

}

#else

#define bswap_ehdr(e) do { } while (0)

#define bswap_phdr(e) do { } while (0)

#define bswap_shdr(e) do { } while (0)

#define bswap_sym(e) do { } while (0)

static int find_phdr(struct elfhdr *ehdr, int fd, struct elf_phdr *phdr, uint32_t type)

{

    int i, retval;

    retval = lseek(fd, ehdr->e_phoff, SEEK_SET);

    if (retval < 0)

	return -1;

    for (i = 0; i < ehdr->e_phnum; i++) {

	retval = read(fd, phdr, sizeof(*phdr));

	if (retval < 0)

	    return -1;

	bswap_phdr(phdr);

	if (phdr->p_type == type)

	    return 0;

    }

    return -1;

}

static void *find_shdr(struct elfhdr *ehdr, int fd, struct elf_shdr *shdr, uint32_t type)

{

    int i, retval;

    retval = lseek(fd, ehdr->e_shoff, SEEK_SET);

    if (retval < 0)

	return NULL;

    for (i = 0; i < ehdr->e_shnum; i++) {

	retval = read(fd, shdr, sizeof(*shdr));

	if (retval < 0)

	    return NULL;

	bswap_shdr(shdr);

	if (shdr->sh_type == type)

	    return qemu_malloc(shdr->sh_size);

    }

    return NULL;

}

static void *find_strtab(struct elfhdr *ehdr, int fd, struct elf_shdr *shdr, struct elf_shdr *symtab)

{

    int retval;

    retval = lseek(fd, ehdr->e_shoff + sizeof(struct elf_shdr) * symtab->sh_link, SEEK_SET);

    if (retval < 0)

	return NULL;

    retval = read(fd, shdr, sizeof(*shdr));

    if (retval < 0)

	return NULL;

    bswap_shdr(shdr);

    if (shdr->sh_type == SHT_STRTAB)

	return qemu_malloc(shdr->sh_size);;

    return NULL;

}

static int read_program(int fd, struct elf_phdr *phdr, void *dst, uint32_t entry)

{

    int retval;

    retval = lseek(fd, phdr->p_offset + entry - phdr->p_vaddr, SEEK_SET);

    if (retval < 0)

	return -1;

    return read(fd, dst, phdr->p_filesz);

}

static int read_section(int fd, struct elf_shdr *s, void *dst)

{

    int retval;

    retval = lseek(fd, s->sh_offset, SEEK_SET);

    if (retval < 0)

	return -1;

    retval = read(fd, dst, s->sh_size);

    if (retval < 0)

	return -1;

    return 0;

}

static void *process_section(struct elfhdr *ehdr, int fd, struct elf_shdr *shdr, uint32_t type)

{

    void *dst;

    dst = find_shdr(ehdr, fd, shdr, type);

    if (!dst)

	goto error;

    if (read_section(fd, shdr, dst))

	goto error;

    return dst;

 error:

    qemu_free(dst);

    return NULL;

}

static void *process_strtab(struct elfhdr *ehdr, int fd, struct elf_shdr *shdr, struct elf_shdr *symtab)

{

    void *dst;

    dst = find_strtab(ehdr, fd, shdr, symtab);

    if (!dst)

	goto error;

    if (read_section(fd, shdr, dst))

	goto error;

    return dst;

 error:

    qemu_free(dst);

    return NULL;

}

static void load_symbols(struct elfhdr *ehdr, int fd)

{

    struct elf_shdr symtab, strtab;

    struct elf_sym *syms;

    struct syminfo *s;

    int nsyms, i;

    char *str;

    /* Symbol table */

    syms = process_section(ehdr, fd, &symtab, SHT_SYMTAB);

    if (!syms)

	return;

    nsyms = symtab.sh_size / sizeof(struct elf_sym);

    for (i = 0; i < nsyms; i++)

	bswap_sym(&syms[i]);

    /* String table */

    str = process_strtab(ehdr, fd, &strtab, &symtab);

    if (!str)

	goto error_freesyms;

    /* Commit */

    s = qemu_mallocz(sizeof(*s));

    s->disas_symtab = syms;

    s->disas_num_syms = nsyms;

    s->disas_strtab = str;

    s->next = syminfos;

    syminfos = s;

    return;

 error_freesyms:

    qemu_free(syms);

    return;

}

    struct elfhdr ehdr;

    struct elf_phdr phdr;

    bswap_ehdr(&ehdr);

	|| ehdr.e_ident[2] != 'L' || ehdr.e_ident[3] != 'F'

	|| (ehdr.e_machine != EM_SPARC

	    && ehdr.e_machine != EM_SPARC32PLUS))

    if (find_phdr(&ehdr, fd, &phdr, PT_LOAD))

	goto error;

    retval = read_program(fd, &phdr, addr, ehdr.e_entry);

    if (retval < 0)

	goto error;

    load_symbols(&ehdr, fd);