Initial revision

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 */