diff options
Diffstat (limited to 'common/cmd_elf.c')
| -rw-r--r-- | common/cmd_elf.c | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/common/cmd_elf.c b/common/cmd_elf.c new file mode 100644 index 0000000..88744b4 --- /dev/null +++ b/common/cmd_elf.c @@ -0,0 +1,322 @@ +/* + * 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 <cmd_elf.h> +#include <elf.h> + + +#if (CONFIG_COMMANDS & CFG_CMD_ELF) + +#ifndef MAX +#define MAX(a,b) ((a) > (b) ? (a) : (b)) +#endif + + +/* ====================================================================== + * Interpreter command to boot an arbitrary ELF image from memory. + * ====================================================================== */ +int do_bootelf (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +{ + unsigned long addr; /* Address of the ELF image */ + unsigned long rc; /* Return value from user code */ + + /* -------------------------------------------------- */ + int rcode = 0; + + if (argc < 2) + addr = load_addr; + else + addr = simple_strtoul (argv[1], NULL, 16); + + if (!valid_elf_image (addr)) + return 1; + + addr = load_elf_image (addr); + + printf ("## Starting application at 0x%08lx ...\n", addr); + + /* + * QNX images require the data cache is disabled. + * Data cache is already flushed, so just turn it off. + */ + if (dcache_status ()) + dcache_disable (); + + /* + * pass address parameter as argv[0] (aka command name), + * and all remaining args + */ + rc = ((ulong (*)(int, char *[])) addr) (--argc, &argv[1]); + if (rc != 0) + rcode = 1; + + printf ("## Application terminated, rc = 0x%lx\n", rc); + 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 *argv[]) +{ +#if defined(CONFIG_WALNUT405) || \ + defined(CONFIG_CPCI405) || \ + defined(CONFIG_OCRTC) || \ + defined(CONFIG_ORSG) + DECLARE_GLOBAL_DATA_PTR; +#endif + + unsigned long addr; /* Address of image */ + unsigned long bootaddr; /* Address to put the bootline */ + char *bootline; /* Text of the bootline */ + char *tmp; /* Temporary char pointer */ + +#if defined(CONFIG_4xx) || defined(CONFIG_IOP480) + char build_buf[80]; /* Buffer for building the bootline */ +#endif + /* -------------------------------------------------- */ + + /* + * Check the loadaddr variable. + * If we don't know where the image is then we're done. + */ + + if ((tmp = getenv ("loadaddr")) != NULL) { + addr = simple_strtoul (tmp, NULL, 16); + } else { + printf ("No load address provided\n"); + return 1; + } + +#if (CONFIG_COMMANDS & CFG_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 (TFTP) == 0) + return 1; + printf ("Automatic boot of VxWorks image at address 0x%08lx ... \n", addr); + } +#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_WALNUT405) + tmp = (char *) CFG_NVRAM_BASE_ADDR + 0x500; + memcpy ((char *) tmp, (char *) &gd->bd->bi_enetaddr[3], 3); +#elif defined(CONFIG_CPCI405) + tmp = (char *) CFG_NVRAM_BASE_ADDR + CFG_NVRAM_VXWORKS_OFFS; + memcpy ((char *) tmp, (char *) &gd->bd->bi_enetaddr[0], 6); +#elif defined(CONFIG_OCRTC) || defined(CONFIG_ORSG) + tmp = (char *) CFG_ETHERNET_MAC_ADDR; + memcpy ((char *) tmp, (char *) &gd->bd->bi_enetaddr[0], 6); +#else + printf ("## Ethernet MAC address not copied to NV RAM\n"); +#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 + */ + + if ((tmp = getenv ("bootaddr")) == NULL) + bootaddr = 0x4200; + else + bootaddr = simple_strtoul (tmp, NULL, 16); + + /* + * 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 + */ + + if ((bootline = getenv ("bootargs")) != NULL) { + memcpy ((void *) bootaddr, bootline, MAX(strlen(bootline), 255)); + flush_cache (bootaddr, MAX(strlen(bootline), 255)); + } else { +#if defined(CONFIG_4xx) + sprintf (build_buf, "ibmEmac(0,0)"); + + if ((tmp = getenv ("hostname")) != NULL) { + sprintf (&build_buf[strlen (build_buf - 1)], + "host:%s ", tmp); + } else { + sprintf (&build_buf[strlen (build_buf - 1)], + ": "); + } + + if ((tmp = getenv ("ipaddr")) != NULL) { + sprintf (&build_buf[strlen (build_buf - 1)], + "e=%s ", tmp); + } + memcpy ((void *)bootaddr, build_buf, MAX(strlen(build_buf), 255)); + flush_cache (bootaddr, MAX(strlen(build_buf), 255)); +#elif defined(CONFIG_IOP480) + sprintf (build_buf, "dc(0,0)"); + + if ((tmp = getenv ("hostname")) != NULL) { + sprintf (&build_buf[strlen (build_buf - 1)], + "host:%s ", tmp); + } else { + sprintf (&build_buf[strlen (build_buf - 1)], + ": "); + } + + if ((tmp = getenv ("ipaddr")) != NULL) { + sprintf (&build_buf[strlen (build_buf - 1)], + "e=%s ", tmp); + } + memcpy ((void *) bootaddr, build_buf, MAX(strlen(build_buf), 255)); + flush_cache (bootaddr, MAX(strlen(build_buf), 255)); +#else + + /* + * I'm not sure what the device should be for other + * PPC flavors, the hostname and ipaddr should be ok + * to just copy + */ + + printf ("No bootargs defined\n"); + return 1; +#endif + } + + /* + * 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 + */ + + if (valid_elf_image (addr)) { + addr = load_elf_image (addr); + } else { + printf ("## Not an ELF image, assuming binary\n"); + /* leave addr as load_addr */ + } + + printf ("## Using bootline (@ 0x%lx): %s\n", bootaddr, + (char *) bootaddr); + printf ("## Starting vxWorks at 0x%08lx ...\n", addr); + + ((void (*)(void)) addr) (); + + printf ("## vxWorks terminated\n"); + return 1; +} + +/* ====================================================================== + * 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 (ehdr->e_machine != EM_PPC) { + printf ("## Not a PowerPC elf image at address 0x%08lx\n", + addr); + return 0; + } + + return 1; +} + + +/* ====================================================================== + * A very simple elf loader, assumes the image is valid, returns the + * entry point address. + * ====================================================================== */ +unsigned long load_elf_image (unsigned long addr) +{ + 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))); + + 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))); + + if (!(shdr->sh_flags & SHF_ALLOC) + || shdr->sh_addr == 0 || shdr->sh_size == 0) { + continue; + } + + if (strtab) { + printf ("%sing %s @ 0x%08lx (%ld bytes)\n", + (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 *)shdr->sh_addr, 0, shdr->sh_size); + } else { + image = (unsigned char *) addr + shdr->sh_offset; + memcpy ((void *) shdr->sh_addr, + (const void *) image, + shdr->sh_size); + } + flush_cache (shdr->sh_addr, shdr->sh_size); + } + + return ehdr->e_entry; +} + +/* ====================================================================== */ +#endif /* CFG_CMD_ELF */ |