Archipelago » qemu

VL_OBJS=vl.o osdep.o block.o readline.o monitor.o pci.o console.o loader.o

VL_OBJS+= sun4m.o tcx.o lance.o iommu.o m48t59.o slavio_intctl.o

loader.o: loader.c elf_ops.h

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)

{

    struct elfhdr ehdr;

    struct elf_phdr *phdr = NULL, *ph;

    int size, i, total_size;

    elf_word mem_size, addr;

    uint8_t *data;

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

        goto fail;

    if (must_swab) {

        glue(bswap_ehdr, SZ)(&ehdr);

    }

    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) {

                lseek(fd, ph->p_offset, SEEK_SET);

                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;

            qemu_free(data);

        }

    }

    return total_size;

 fail:

    qemu_free(phdr);

    return -1;

}

/*

 * 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;

}

/* loader.c */

int get_image_size(const char *filename);

int load_image(const char *filename, uint8_t *addr);

int load_elf(const char *filename, int64_t virt_to_phys_addend);