diff options
author | Blue Swirl <blauwirbel@gmail.com> | 2009-09-20 14:58:02 +0000 |
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committer | Blue Swirl <blauwirbel@gmail.com> | 2009-09-20 14:58:02 +0000 |
commit | ca20cf32ab3d945155141ef737f5d08ebb373e1d (patch) | |
tree | 45515350fdf7b5322658095beec591565a78506d /hw/loader.c | |
parent | a333cd7166d12397635e16dcade28da5ba8ec7b3 (diff) |
Compile loader only once
Callers must pass ELF machine, byte swapping and symbol LSB clearing
information to ELF loader. A.out loader needs page size information, pass
that too as a parameter.
Extract prototypes to a separate file. Move loader.[ch] and elf_ops.h under hw.
Adjust callers. Also use target_phys_addr_t instead of target_ulong for
addresses: loader addresses aren't virtual.
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Diffstat (limited to 'hw/loader.c')
-rw-r--r-- | hw/loader.c | 546 |
1 files changed, 546 insertions, 0 deletions
diff --git a/hw/loader.c b/hw/loader.c new file mode 100644 index 0000000000..5d83a66041 --- /dev/null +++ b/hw/loader.c @@ -0,0 +1,546 @@ +/* + * 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. + * + * Gunzip functionality in this file is derived from u-boot: + * + * (C) Copyright 2008 Semihalf + * + * (C) Copyright 2000-2005 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "hw.h" +#include "disas.h" +#include "sysemu.h" +#include "uboot_image.h" +#include "loader.h" + +#include <zlib.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 */ +/* deprecated, because caller does not specify buffer size! */ +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; +} + +/* return the amount read, just like fread. 0 may mean error or eof */ +int fread_targphys(target_phys_addr_t dst_addr, size_t nbytes, FILE *f) +{ + uint8_t buf[4096]; + target_phys_addr_t dst_begin = dst_addr; + size_t want, did; + + while (nbytes) { + want = nbytes > sizeof(buf) ? sizeof(buf) : nbytes; + did = fread(buf, 1, want, f); + + cpu_physical_memory_write_rom(dst_addr, buf, did); + dst_addr += did; + nbytes -= did; + if (did != want) + break; + } + return dst_addr - dst_begin; +} + +/* returns 0 on error, 1 if ok */ +int fread_targphys_ok(target_phys_addr_t dst_addr, size_t nbytes, FILE *f) +{ + return fread_targphys(dst_addr, nbytes, f) == nbytes; +} + +/* read()-like version */ +int read_targphys(int fd, target_phys_addr_t dst_addr, size_t nbytes) +{ + uint8_t buf[4096]; + target_phys_addr_t dst_begin = dst_addr; + size_t want, did; + + while (nbytes) { + want = nbytes > sizeof(buf) ? sizeof(buf) : nbytes; + did = read(fd, buf, want); + if (did != want) break; + + cpu_physical_memory_write_rom(dst_addr, buf, did); + dst_addr += did; + nbytes -= did; + } + return dst_addr - dst_begin; +} + +/* return the size or -1 if error */ +int load_image_targphys(const char *filename, + target_phys_addr_t addr, int max_sz) +{ + FILE *f; + size_t got; + + f = fopen(filename, "rb"); + if (!f) return -1; + + got = fread_targphys(addr, max_sz, f); + if (ferror(f)) { fclose(f); return -1; } + fclose(f); + + return got; +} + +void pstrcpy_targphys(target_phys_addr_t dest, int buf_size, + const char *source) +{ + static const uint8_t nul_byte = 0; + const char *nulp; + + if (buf_size <= 0) return; + nulp = memchr(source, 0, buf_size); + if (nulp) { + cpu_physical_memory_write_rom(dest, (uint8_t *)source, + (nulp - source) + 1); + } else { + cpu_physical_memory_write_rom(dest, (uint8_t *)source, buf_size - 1); + cpu_physical_memory_write_rom(dest, &nul_byte, 1); + } +} + +/* 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 */ +}; + +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); +} + +#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, target_page_size) (N_MAGIC(x) == QMAGIC ? target_page_size : 0) +#define _N_SEGMENT_ROUND(x, target_page_size) (((x) + target_page_size - 1) & ~(target_page_size - 1)) + +#define _N_TXTENDADDR(x, target_page_size) (N_TXTADDR(x, target_page_size)+(x).a_text) + +#define N_DATADDR(x, target_page_size) \ + (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x, target_page_size)) \ + : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x, target_page_size), target_page_size))) + + +int load_aout(const char *filename, target_phys_addr_t addr, int max_sz, + int bswap_needed, target_phys_addr_t target_page_size) +{ + 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; + + if (bswap_needed) { + bswap_ahdr(&e); + } + + magic = N_MAGIC(e); + switch (magic) { + case ZMAGIC: + case QMAGIC: + case OMAGIC: + if (e.a_text + e.a_data > max_sz) + goto fail; + lseek(fd, N_TXTOFF(e), SEEK_SET); + size = read_targphys(fd, addr, e.a_text + e.a_data); + if (size < 0) + goto fail; + break; + case NMAGIC: + if (N_DATADDR(e, target_page_size) + e.a_data > max_sz) + goto fail; + lseek(fd, N_TXTOFF(e), SEEK_SET); + size = read_targphys(fd, addr, e.a_text); + if (size < 0) + goto fail; + ret = read_targphys(fd, addr + N_DATADDR(e, target_page_size), + 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 (read(fd, ptr, size) != size) { + qemu_free(ptr); + return NULL; + } + return ptr; +} + +#ifdef ELF_CLASS +#undef ELF_CLASS +#endif + +#define ELF_CLASS ELFCLASS32 +#include "elf.h" + +#define SZ 32 +#define elf_word uint32_t +#define elf_sword int32_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 elf_sword +#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 elf_sword int64_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 address_offset, + uint64_t *pentry, uint64_t *lowaddr, uint64_t *highaddr, + int big_endian, int elf_machine, int clear_lsb) +{ + int fd, data_order, target_data_order, must_swab, ret; + uint8_t e_ident[EI_NIDENT]; + + fd = open(filename, O_RDONLY | O_BINARY); + 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 HOST_WORDS_BIGENDIAN + data_order = ELFDATA2MSB; +#else + data_order = ELFDATA2LSB; +#endif + must_swab = data_order != e_ident[EI_DATA]; + if (big_endian) { + target_data_order = ELFDATA2MSB; + } else { + target_data_order = ELFDATA2LSB; + } + + if (target_data_order != e_ident[EI_DATA]) + return -1; + + lseek(fd, 0, SEEK_SET); + if (e_ident[EI_CLASS] == ELFCLASS64) { + ret = load_elf64(fd, address_offset, must_swab, pentry, + lowaddr, highaddr, elf_machine, clear_lsb); + } else { + ret = load_elf32(fd, address_offset, must_swab, pentry, + lowaddr, highaddr, elf_machine, clear_lsb); + } + + close(fd); + return ret; + + fail: + close(fd); + return -1; +} + +static void bswap_uboot_header(uboot_image_header_t *hdr) +{ +#ifndef HOST_WORDS_BIGENDIAN + bswap32s(&hdr->ih_magic); + bswap32s(&hdr->ih_hcrc); + bswap32s(&hdr->ih_time); + bswap32s(&hdr->ih_size); + bswap32s(&hdr->ih_load); + bswap32s(&hdr->ih_ep); + bswap32s(&hdr->ih_dcrc); +#endif +} + + +#define ZALLOC_ALIGNMENT 16 + +static void *zalloc(void *x, unsigned items, unsigned size) +{ + void *p; + + size *= items; + size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1); + + p = qemu_malloc(size); + + return (p); +} + +static void zfree(void *x, void *addr) +{ + qemu_free(addr); +} + + +#define HEAD_CRC 2 +#define EXTRA_FIELD 4 +#define ORIG_NAME 8 +#define COMMENT 0x10 +#define RESERVED 0xe0 + +#define DEFLATED 8 + +/* This is the maximum in uboot, so if a uImage overflows this, it would + * overflow on real hardware too. */ +#define UBOOT_MAX_GUNZIP_BYTES 0x800000 + +static ssize_t gunzip(void *dst, size_t dstlen, uint8_t *src, + size_t srclen) +{ + z_stream s; + ssize_t dstbytes; + int r, i, flags; + + /* skip header */ + i = 10; + flags = src[3]; + if (src[2] != DEFLATED || (flags & RESERVED) != 0) { + puts ("Error: Bad gzipped data\n"); + return -1; + } + if ((flags & EXTRA_FIELD) != 0) + i = 12 + src[10] + (src[11] << 8); + if ((flags & ORIG_NAME) != 0) + while (src[i++] != 0) + ; + if ((flags & COMMENT) != 0) + while (src[i++] != 0) + ; + if ((flags & HEAD_CRC) != 0) + i += 2; + if (i >= srclen) { + puts ("Error: gunzip out of data in header\n"); + return -1; + } + + s.zalloc = zalloc; + s.zfree = zfree; + + r = inflateInit2(&s, -MAX_WBITS); + if (r != Z_OK) { + printf ("Error: inflateInit2() returned %d\n", r); + return (-1); + } + s.next_in = src + i; + s.avail_in = srclen - i; + s.next_out = dst; + s.avail_out = dstlen; + r = inflate(&s, Z_FINISH); + if (r != Z_OK && r != Z_STREAM_END) { + printf ("Error: inflate() returned %d\n", r); + return -1; + } + dstbytes = s.next_out - (unsigned char *) dst; + inflateEnd(&s); + + return dstbytes; +} + +/* Load a U-Boot image. */ +int load_uimage(const char *filename, target_phys_addr_t *ep, + target_phys_addr_t *loadaddr, int *is_linux) +{ + int fd; + int size; + uboot_image_header_t h; + uboot_image_header_t *hdr = &h; + uint8_t *data = NULL; + int ret = -1; + + fd = open(filename, O_RDONLY | O_BINARY); + if (fd < 0) + return -1; + + size = read(fd, hdr, sizeof(uboot_image_header_t)); + if (size < 0) + goto out; + + bswap_uboot_header(hdr); + + if (hdr->ih_magic != IH_MAGIC) + goto out; + + /* TODO: Implement other image types. */ + if (hdr->ih_type != IH_TYPE_KERNEL) { + fprintf(stderr, "Can only load u-boot image type \"kernel\"\n"); + goto out; + } + + switch (hdr->ih_comp) { + case IH_COMP_NONE: + case IH_COMP_GZIP: + break; + default: + fprintf(stderr, + "Unable to load u-boot images with compression type %d\n", + hdr->ih_comp); + goto out; + } + + /* TODO: Check CPU type. */ + if (is_linux) { + if (hdr->ih_os == IH_OS_LINUX) + *is_linux = 1; + else + *is_linux = 0; + } + + *ep = hdr->ih_ep; + data = qemu_malloc(hdr->ih_size); + + if (read(fd, data, hdr->ih_size) != hdr->ih_size) { + fprintf(stderr, "Error reading file\n"); + goto out; + } + + if (hdr->ih_comp == IH_COMP_GZIP) { + uint8_t *compressed_data; + size_t max_bytes; + ssize_t bytes; + + compressed_data = data; + max_bytes = UBOOT_MAX_GUNZIP_BYTES; + data = qemu_malloc(max_bytes); + + bytes = gunzip(data, max_bytes, compressed_data, hdr->ih_size); + qemu_free(compressed_data); + if (bytes < 0) { + fprintf(stderr, "Unable to decompress gzipped image!\n"); + goto out; + } + hdr->ih_size = bytes; + } + + cpu_physical_memory_write_rom(hdr->ih_load, data, hdr->ih_size); + + if (loadaddr) + *loadaddr = hdr->ih_load; + + ret = hdr->ih_size; + +out: + if (data) + qemu_free(data); + close(fd); + return ret; +} |