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-rw-r--r--common/cmd_elf.c322
1 files changed, 322 insertions, 0 deletions
diff --git a/common/cmd_elf.c b/common/cmd_elf.c
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+++ b/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 <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 */
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