u-boot/common/cmd_elf.c

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/*
* Copyright (c) 2001 William L. Pitts
* All rights reserved.
*
* Redistribution and use in source and binary forms are freely
* permitted provided that the above copyright notice and this
* paragraph and the following disclaimer are duplicated in all
* such forms.
*
* This software is provided "AS IS" and without any express or
* implied warranties, including, without limitation, the implied
* warranties of merchantability and fitness for a particular
* purpose.
*/
#include <common.h>
#include <command.h>
#include <linux/ctype.h>
#include <net.h>
#include <elf.h>
#include <vxworks.h>
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#if defined(CONFIG_WALNUT) || defined(CONFIG_SYS_VXWORKS_MAC_PTR)
DECLARE_GLOBAL_DATA_PTR;
#endif
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static unsigned long load_elf_image_phdr(unsigned long addr);
static unsigned long load_elf_image_shdr(unsigned long addr);
/* Allow ports to override the default behavior */
__attribute__((weak))
unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]),
int argc, char * const argv[])
{
unsigned long ret;
/*
* QNX images require the data cache is disabled.
* Data cache is already flushed, so just turn it off.
*/
int dcache = dcache_status();
if (dcache)
dcache_disable();
/*
* pass address parameter as argv[0] (aka command name),
* and all remaining args
*/
ret = entry(argc, argv);
if (dcache)
dcache_enable();
return ret;
}
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/* ======================================================================
* Determine if a valid ELF image exists at the given memory location.
* First looks at the ELF header magic field, the makes sure that it is
* executable and makes sure that it is for a PowerPC.
* ====================================================================== */
int valid_elf_image(unsigned long addr)
{
Elf32_Ehdr *ehdr; /* Elf header structure pointer */
/* -------------------------------------------------- */
ehdr = (Elf32_Ehdr *) addr;
if (!IS_ELF(*ehdr)) {
printf("## No elf image at address 0x%08lx\n", addr);
return 0;
}
if (ehdr->e_type != ET_EXEC) {
printf("## Not a 32-bit elf image at address 0x%08lx\n", addr);
return 0;
}
#if 0
if (ehdr->e_machine != EM_PPC) {
printf("## Not a PowerPC elf image at address 0x%08lx\n", addr);
return 0;
}
#endif
return 1;
}
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/* ======================================================================
* Interpreter command to boot an arbitrary ELF image from memory.
* ====================================================================== */
int do_bootelf(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
unsigned long addr; /* Address of the ELF image */
unsigned long rc; /* Return value from user code */
char *sload, *saddr;
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/* -------------------------------------------------- */
int rcode = 0;
sload = saddr = NULL;
if (argc == 3) {
sload = argv[1];
saddr = argv[2];
} else if (argc == 2) {
if (argv[1][0] == '-')
sload = argv[1];
else
saddr = argv[1];
}
if (saddr)
addr = simple_strtoul(saddr, NULL, 16);
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else
addr = load_addr;
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if (!valid_elf_image(addr))
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return 1;
if (sload && sload[1] == 'p')
addr = load_elf_image_phdr(addr);
else
addr = load_elf_image_shdr(addr);
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printf("## Starting application at 0x%08lx ...\n", addr);
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/*
* pass address parameter as argv[0] (aka command name),
* and all remaining args
*/
rc = do_bootelf_exec((void *)addr, argc - 1, argv + 1);
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if (rc != 0)
rcode = 1;
printf("## Application terminated, rc = 0x%lx\n", rc);
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return rcode;
}
/* ======================================================================
* Interpreter command to boot VxWorks from a memory image. The image can
* be either an ELF image or a raw binary. Will attempt to setup the
* bootline and other parameters correctly.
* ====================================================================== */
int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
unsigned long addr; /* Address of image */
unsigned long bootaddr; /* Address to put the bootline */
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char *bootline; /* Text of the bootline */
char *tmp; /* Temporary char pointer */
char build_buf[128]; /* Buffer for building the bootline */
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/* ---------------------------------------------------
*
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* Check the loadaddr variable.
* If we don't know where the image is then we're done.
*/
if (argc < 2)
addr = load_addr;
else
addr = simple_strtoul(argv[1], NULL, 16);
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#if defined(CONFIG_CMD_NET)
/*
* Check to see if we need to tftp the image ourselves before starting
*/
if ((argc == 2) && (strcmp(argv[1], "tftp") == 0)) {
if (NetLoop(TFTPGET) <= 0)
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return 1;
printf("Automatic boot of VxWorks image at address 0x%08lx ...\n",
addr);
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}
#endif
/* This should equate
* to NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET
* from the VxWorks BSP header files.
* This will vary from board to board
*/
#if defined(CONFIG_WALNUT)
tmp = (char *) CONFIG_SYS_NVRAM_BASE_ADDR + 0x500;
eth_getenv_enetaddr("ethaddr", (uchar *)build_buf);
memcpy(tmp, &build_buf[3], 3);
#elif defined(CONFIG_SYS_VXWORKS_MAC_PTR)
tmp = (char *) CONFIG_SYS_VXWORKS_MAC_PTR;
eth_getenv_enetaddr("ethaddr", (uchar *)build_buf);
memcpy(tmp, build_buf, 6);
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#else
puts("## Ethernet MAC address not copied to NV RAM\n");
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#endif
/*
* Use bootaddr to find the location in memory that VxWorks
* will look for the bootline string. The default value for
* PowerPC is LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET which
* defaults to 0x4200
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*/
tmp = getenv("bootaddr");
if (!tmp)
bootaddr = CONFIG_SYS_VXWORKS_BOOT_ADDR;
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else
bootaddr = simple_strtoul(tmp, NULL, 16);
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/*
* Check to see if the bootline is defined in the 'bootargs'
* parameter. If it is not defined, we may be able to
* construct the info
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*/
bootline = getenv("bootargs");
if (bootline) {
memcpy((void *) bootaddr, bootline,
max(strlen(bootline), 255));
flush_cache(bootaddr, max(strlen(bootline), 255));
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} else {
sprintf(build_buf, CONFIG_SYS_VXWORKS_BOOT_DEVICE);
tmp = getenv("bootfile");
if (tmp)
sprintf(&build_buf[strlen(build_buf)],
"%s:%s ", CONFIG_SYS_VXWORKS_SERVERNAME, tmp);
else
sprintf(&build_buf[strlen(build_buf)],
"%s:file ", CONFIG_SYS_VXWORKS_SERVERNAME);
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tmp = getenv("ipaddr");
if (tmp)
sprintf(&build_buf[strlen(build_buf)], "e=%s ", tmp);
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tmp = getenv("serverip");
if (tmp)
sprintf(&build_buf[strlen(build_buf)], "h=%s ", tmp);
tmp = getenv("hostname");
if (tmp)
sprintf(&build_buf[strlen(build_buf)], "tn=%s ", tmp);
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#ifdef CONFIG_SYS_VXWORKS_ADD_PARAMS
sprintf(&build_buf[strlen(build_buf)],
CONFIG_SYS_VXWORKS_ADD_PARAMS);
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#endif
memcpy((void *) bootaddr, build_buf,
max(strlen(build_buf), 255));
flush_cache(bootaddr, max(strlen(build_buf), 255));
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}
/*
* If the data at the load address is an elf image, then
* treat it like an elf image. Otherwise, assume that it is a
* binary image
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*/
if (valid_elf_image(addr)) {
addr = load_elf_image_shdr(addr);
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} else {
puts("## Not an ELF image, assuming binary\n");
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/* leave addr as load_addr */
}
printf("## Using bootline (@ 0x%lx): %s\n", bootaddr,
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(char *) bootaddr);
printf("## Starting vxWorks at 0x%08lx ...\n", addr);
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dcache_disable();
((void (*)(int)) addr) (0);
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puts("## vxWorks terminated\n");
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return 1;
}
/* ======================================================================
* A very simple elf loader, assumes the image is valid, returns the
* entry point address.
* ====================================================================== */
static unsigned long load_elf_image_phdr(unsigned long addr)
{
Elf32_Ehdr *ehdr; /* Elf header structure pointer */
Elf32_Phdr *phdr; /* Program header structure pointer */
int i;
ehdr = (Elf32_Ehdr *) addr;
phdr = (Elf32_Phdr *) (addr + ehdr->e_phoff);
/* Load each program header */
for (i = 0; i < ehdr->e_phnum; ++i) {
void *dst = (void *)(uintptr_t) phdr->p_paddr;
void *src = (void *) addr + phdr->p_offset;
debug("Loading phdr %i to 0x%p (%i bytes)\n",
i, dst, phdr->p_filesz);
if (phdr->p_filesz)
memcpy(dst, src, phdr->p_filesz);
if (phdr->p_filesz != phdr->p_memsz)
memset(dst + phdr->p_filesz, 0x00,
phdr->p_memsz - phdr->p_filesz);
flush_cache((unsigned long)dst, phdr->p_filesz);
++phdr;
}
return ehdr->e_entry;
}
static unsigned long load_elf_image_shdr(unsigned long addr)
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{
Elf32_Ehdr *ehdr; /* Elf header structure pointer */
Elf32_Shdr *shdr; /* Section header structure pointer */
unsigned char *strtab = 0; /* String table pointer */
unsigned char *image; /* Binary image pointer */
int i; /* Loop counter */
/* -------------------------------------------------- */
ehdr = (Elf32_Ehdr *) addr;
/* Find the section header string table for output info */
shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
(ehdr->e_shstrndx * sizeof(Elf32_Shdr)));
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if (shdr->sh_type == SHT_STRTAB)
strtab = (unsigned char *) (addr + shdr->sh_offset);
/* Load each appropriate section */
for (i = 0; i < ehdr->e_shnum; ++i) {
shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
(i * sizeof(Elf32_Shdr)));
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if (!(shdr->sh_flags & SHF_ALLOC)
|| shdr->sh_addr == 0 || shdr->sh_size == 0) {
continue;
}
if (strtab) {
debug("%sing %s @ 0x%08lx (%ld bytes)\n",
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(shdr->sh_type == SHT_NOBITS) ?
"Clear" : "Load",
&strtab[shdr->sh_name],
(unsigned long) shdr->sh_addr,
(long) shdr->sh_size);
}
if (shdr->sh_type == SHT_NOBITS) {
memset((void *)(uintptr_t) shdr->sh_addr, 0,
shdr->sh_size);
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} else {
image = (unsigned char *) addr + shdr->sh_offset;
memcpy((void *)(uintptr_t) shdr->sh_addr,
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(const void *) image,
shdr->sh_size);
}
flush_cache(shdr->sh_addr, shdr->sh_size);
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}
return ehdr->e_entry;
}
/* ====================================================================== */
U_BOOT_CMD(
bootelf, 3, 0, do_bootelf,
"Boot from an ELF image in memory",
"[-p|-s] [address]\n"
"\t- load ELF image at [address] via program headers (-p)\n"
"\t or via section headers (-s)"
);
U_BOOT_CMD(
bootvx, 2, 0, do_bootvx,
"Boot vxWorks from an ELF image",
" [address] - load address of vxWorks ELF image."
);