Archipelago » qemu

static void glue(bswap_ehdr, SZ)(struct elfhdr *ehdr)

{

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

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

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

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

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

    bswapSZs(&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 glue(bswap_phdr, SZ)(struct elf_phdr *phdr)

{

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

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

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

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

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

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

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

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

}

static void glue(bswap_shdr, SZ)(struct elf_shdr *shdr)

{

    bswap32s(&shdr->sh_name);

    bswap32s(&shdr->sh_type);

    bswapSZs(&shdr->sh_flags);

    bswapSZs(&shdr->sh_addr);

    bswapSZs(&shdr->sh_offset);

    bswapSZs(&shdr->sh_size);

    bswap32s(&shdr->sh_link);

    bswap32s(&shdr->sh_info);

    bswapSZs(&shdr->sh_addralign);

    bswapSZs(&shdr->sh_entsize);

}

static void glue(bswap_sym, SZ)(struct elf_sym *sym)

{

    bswap32s(&sym->st_name);

    bswapSZs(&sym->st_value);

    bswapSZs(&sym->st_size);

    bswap16s(&sym->st_shndx);

}

static struct elf_shdr *glue(find_section, SZ)(struct elf_shdr *shdr_table,

                                               int n, int type)

{

    int i;

    for(i=0;i<n;i++) {

        if (shdr_table[i].sh_type == type)

            return shdr_table + i;

    }

    return NULL;

}

static int glue(load_symbols, SZ)(struct elfhdr *ehdr, int fd, int must_swab)

{

    struct elf_shdr *symtab, *strtab, *shdr_table = NULL;

    struct elf_sym *syms = NULL;

#if (SZ == 64)

    struct elf32_sym *syms32 = NULL;

#endif

    struct syminfo *s;

    int nsyms, i;

    char *str = NULL;

    shdr_table = load_at(fd, ehdr->e_shoff,

                         sizeof(struct elf_shdr) * ehdr->e_shnum);

    if (!shdr_table)

        return -1;

    if (must_swab) {

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

            glue(bswap_shdr, SZ)(shdr_table + i);

        }

    }

    symtab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_SYMTAB);

    if (!symtab)

        goto fail;

    syms = load_at(fd, symtab->sh_offset, symtab->sh_size);

    if (!syms)

        goto fail;

    nsyms = symtab->sh_size / sizeof(struct elf_sym);

#if (SZ == 64)

    syms32 = qemu_mallocz(nsyms * sizeof(struct elf32_sym));

#endif

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

        if (must_swab)

            glue(bswap_sym, SZ)(&syms[i]);

#if (SZ == 64)

        syms32[i].st_name = syms[i].st_name;

        syms32[i].st_info = syms[i].st_info;

        syms32[i].st_other = syms[i].st_other;

        syms32[i].st_shndx = syms[i].st_shndx;

        syms32[i].st_value = syms[i].st_value & 0xffffffff;

        syms32[i].st_size = syms[i].st_size & 0xffffffff;

#endif

    }

    /* String table */

    if (symtab->sh_link >= ehdr->e_shnum)

        goto fail;

    strtab = &shdr_table[symtab->sh_link];

    str = load_at(fd, strtab->sh_offset, strtab->sh_size);

    if (!str)

        goto fail;

    /* Commit */

    s = qemu_mallocz(sizeof(*s));

#if (SZ == 64)

    s->disas_symtab = syms32;

    qemu_free(syms);

#else

    s->disas_symtab = syms;

#endif

    s->disas_num_syms = nsyms;

    s->disas_strtab = str;

    s->next = syminfos;

    syminfos = s;

    qemu_free(shdr_table);

    return 0;

 fail:

#if (SZ == 64)

    qemu_free(syms32);

#endif

    qemu_free(syms);

    qemu_free(str);

    qemu_free(shdr_table);

    return -1;

}

int glue(load_elf, SZ)(int fd, int64_t virt_to_phys_addend,

                       int must_swab, uint64_t *pentry,

                       uint64_t *lowaddr, uint64_t *highaddr)

{

    struct elfhdr ehdr;

    struct elf_phdr *phdr = NULL, *ph;

    int size, i, total_size;

    elf_word mem_size;

    uint64_t addr, low = 0, high = 0;

    uint8_t *data = NULL;

    if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))

        goto fail;

    if (must_swab) {

        glue(bswap_ehdr, SZ)(&ehdr);

    }

    if (ELF_MACHINE != ehdr.e_machine)

        goto fail;

    if (pentry)

           *pentry = (uint64_t)(elf_sword)ehdr.e_entry;

    glue(load_symbols, SZ)(&ehdr, fd, must_swab);

    size = ehdr.e_phnum * sizeof(phdr[0]);

    lseek(fd, ehdr.e_phoff, SEEK_SET);

    phdr = qemu_mallocz(size);

    if (!phdr)

        goto fail;

    if (read(fd, phdr, size) != size)

        goto fail;

    if (must_swab) {

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

            ph = &phdr[i];

            glue(bswap_phdr, SZ)(ph);

        }

    }

    total_size = 0;

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

        ph = &phdr[i];

        if (ph->p_type == PT_LOAD) {

            mem_size = ph->p_memsz;

            /* XXX: avoid allocating */

            data = qemu_mallocz(mem_size);

            if (ph->p_filesz > 0) {

                if (lseek(fd, ph->p_offset, SEEK_SET) < 0)

                    goto fail;

                if (read(fd, data, ph->p_filesz) != ph->p_filesz)

                    goto fail;

            }

            addr = ph->p_vaddr + virt_to_phys_addend;

            cpu_physical_memory_write_rom(addr, data, mem_size);

            total_size += mem_size;

            if (!low || addr < low)

                low = addr;

            if (!high || (addr + mem_size) > high)

                high = addr + mem_size;

            qemu_free(data);

            data = NULL;

        }

    }

    qemu_free(phdr);

    if (lowaddr)

        *lowaddr = (uint64_t)(elf_sword)low;

    if (highaddr)

        *highaddr = (uint64_t)(elf_sword)high;

    return total_size;

 fail:

    qemu_free(data);

    qemu_free(phdr);

    return -1;

}