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![Bin Meng](/assets/img/avatar_default.png)
VxWorks on x86 uses stack to pass parameters. Reported-by: Jian Luo <jian.luo4@boschrexroth.de> Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Acked-by: Simon Glass <sjg@chromium.org>
408 lines
10 KiB
C
408 lines
10 KiB
C
/*
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* Copyright (c) 2001 William L. Pitts
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are freely
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* permitted provided that the above copyright notice and this
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* paragraph and the following disclaimer are duplicated in all
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* such forms.
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*
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* This software is provided "AS IS" and without any express or
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* implied warranties, including, without limitation, the implied
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* warranties of merchantability and fitness for a particular
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* purpose.
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*/
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#include <common.h>
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#include <command.h>
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#include <elf.h>
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#include <net.h>
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#include <vxworks.h>
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#ifdef CONFIG_X86
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#include <asm/e820.h>
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#include <linux/linkage.h>
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#endif
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/*
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* A very simple elf loader, assumes the image is valid, returns the
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* entry point address.
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*/
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static unsigned long load_elf_image_phdr(unsigned long addr)
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{
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Elf32_Ehdr *ehdr; /* Elf header structure pointer */
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Elf32_Phdr *phdr; /* Program header structure pointer */
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int i;
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ehdr = (Elf32_Ehdr *)addr;
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phdr = (Elf32_Phdr *)(addr + ehdr->e_phoff);
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/* Load each program header */
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for (i = 0; i < ehdr->e_phnum; ++i) {
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void *dst = (void *)(uintptr_t)phdr->p_paddr;
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void *src = (void *)addr + phdr->p_offset;
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debug("Loading phdr %i to 0x%p (%i bytes)\n",
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i, dst, phdr->p_filesz);
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if (phdr->p_filesz)
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memcpy(dst, src, phdr->p_filesz);
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if (phdr->p_filesz != phdr->p_memsz)
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memset(dst + phdr->p_filesz, 0x00,
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phdr->p_memsz - phdr->p_filesz);
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flush_cache((unsigned long)dst, phdr->p_filesz);
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++phdr;
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}
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return ehdr->e_entry;
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}
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static unsigned long load_elf_image_shdr(unsigned long addr)
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{
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Elf32_Ehdr *ehdr; /* Elf header structure pointer */
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Elf32_Shdr *shdr; /* Section header structure pointer */
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unsigned char *strtab = 0; /* String table pointer */
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unsigned char *image; /* Binary image pointer */
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int i; /* Loop counter */
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ehdr = (Elf32_Ehdr *)addr;
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/* Find the section header string table for output info */
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shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
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(ehdr->e_shstrndx * sizeof(Elf32_Shdr)));
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if (shdr->sh_type == SHT_STRTAB)
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strtab = (unsigned char *)(addr + shdr->sh_offset);
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/* Load each appropriate section */
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for (i = 0; i < ehdr->e_shnum; ++i) {
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shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
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(i * sizeof(Elf32_Shdr)));
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if (!(shdr->sh_flags & SHF_ALLOC) ||
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shdr->sh_addr == 0 || shdr->sh_size == 0) {
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continue;
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}
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if (strtab) {
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debug("%sing %s @ 0x%08lx (%ld bytes)\n",
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(shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
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&strtab[shdr->sh_name],
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(unsigned long)shdr->sh_addr,
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(long)shdr->sh_size);
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}
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if (shdr->sh_type == SHT_NOBITS) {
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memset((void *)(uintptr_t)shdr->sh_addr, 0,
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shdr->sh_size);
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} else {
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image = (unsigned char *)addr + shdr->sh_offset;
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memcpy((void *)(uintptr_t)shdr->sh_addr,
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(const void *)image, shdr->sh_size);
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}
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flush_cache(shdr->sh_addr, shdr->sh_size);
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}
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return ehdr->e_entry;
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}
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/* Allow ports to override the default behavior */
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static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]),
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int argc, char * const argv[])
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{
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unsigned long ret;
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/*
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* QNX images require the data cache is disabled.
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* Data cache is already flushed, so just turn it off.
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*/
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int dcache = dcache_status();
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if (dcache)
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dcache_disable();
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/*
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* pass address parameter as argv[0] (aka command name),
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* and all remaining args
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*/
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ret = entry(argc, argv);
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if (dcache)
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dcache_enable();
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return ret;
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}
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/*
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* Determine if a valid ELF image exists at the given memory location.
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* First look at the ELF header magic field, then make sure that it is
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* executable.
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*/
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int valid_elf_image(unsigned long addr)
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{
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Elf32_Ehdr *ehdr; /* Elf header structure pointer */
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ehdr = (Elf32_Ehdr *)addr;
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if (!IS_ELF(*ehdr)) {
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printf("## No elf image at address 0x%08lx\n", addr);
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return 0;
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}
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if (ehdr->e_type != ET_EXEC) {
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printf("## Not a 32-bit elf image at address 0x%08lx\n", addr);
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return 0;
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}
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return 1;
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}
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/* Interpreter command to boot an arbitrary ELF image from memory */
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int do_bootelf(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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unsigned long addr; /* Address of the ELF image */
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unsigned long rc; /* Return value from user code */
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char *sload, *saddr;
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const char *ep = getenv("autostart");
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int rcode = 0;
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sload = saddr = NULL;
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if (argc == 3) {
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sload = argv[1];
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saddr = argv[2];
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} else if (argc == 2) {
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if (argv[1][0] == '-')
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sload = argv[1];
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else
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saddr = argv[1];
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}
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if (saddr)
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addr = simple_strtoul(saddr, NULL, 16);
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else
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addr = load_addr;
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if (!valid_elf_image(addr))
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return 1;
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if (sload && sload[1] == 'p')
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addr = load_elf_image_phdr(addr);
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else
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addr = load_elf_image_shdr(addr);
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if (ep && !strcmp(ep, "no"))
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return rcode;
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printf("## Starting application at 0x%08lx ...\n", addr);
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/*
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* pass address parameter as argv[0] (aka command name),
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* and all remaining args
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*/
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rc = do_bootelf_exec((void *)addr, argc - 1, argv + 1);
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if (rc != 0)
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rcode = 1;
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printf("## Application terminated, rc = 0x%lx\n", rc);
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return rcode;
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}
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/*
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* Interpreter command to boot VxWorks from a memory image. The image can
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* be either an ELF image or a raw binary. Will attempt to setup the
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* bootline and other parameters correctly.
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*/
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int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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unsigned long addr; /* Address of image */
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unsigned long bootaddr; /* Address to put the bootline */
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char *bootline; /* Text of the bootline */
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char *tmp; /* Temporary char pointer */
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char build_buf[128]; /* Buffer for building the bootline */
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int ptr = 0;
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#ifdef CONFIG_X86
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struct e820info *info;
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struct e820entry *data;
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#endif
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/*
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* Check the loadaddr variable.
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* If we don't know where the image is then we're done.
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*/
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if (argc < 2)
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addr = load_addr;
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else
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addr = simple_strtoul(argv[1], NULL, 16);
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#if defined(CONFIG_CMD_NET)
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/*
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* Check to see if we need to tftp the image ourselves
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* before starting
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*/
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if ((argc == 2) && (strcmp(argv[1], "tftp") == 0)) {
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if (net_loop(TFTPGET) <= 0)
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return 1;
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printf("Automatic boot of VxWorks image at address 0x%08lx ...\n",
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addr);
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}
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#endif
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/*
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* This should equate to
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* NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET
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* from the VxWorks BSP header files.
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* This will vary from board to board
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*/
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#if defined(CONFIG_WALNUT)
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tmp = (char *)CONFIG_SYS_NVRAM_BASE_ADDR + 0x500;
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eth_getenv_enetaddr("ethaddr", (uchar *)build_buf);
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memcpy(tmp, &build_buf[3], 3);
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#elif defined(CONFIG_SYS_VXWORKS_MAC_PTR)
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tmp = (char *)CONFIG_SYS_VXWORKS_MAC_PTR;
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eth_getenv_enetaddr("ethaddr", (uchar *)build_buf);
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memcpy(tmp, build_buf, 6);
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#else
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puts("## Ethernet MAC address not copied to NV RAM\n");
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#endif
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/*
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* Use bootaddr to find the location in memory that VxWorks
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* will look for the bootline string. The default value is
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* (LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET) as defined by
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* VxWorks BSP. For example, on PowerPC it defaults to 0x4200.
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*/
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tmp = getenv("bootaddr");
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if (!tmp) {
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printf("## VxWorks bootline address not specified\n");
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} else {
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bootaddr = simple_strtoul(tmp, NULL, 16);
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/*
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* Check to see if the bootline is defined in the 'bootargs'
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* parameter. If it is not defined, we may be able to
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* construct the info.
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*/
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bootline = getenv("bootargs");
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if (bootline) {
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memcpy((void *)bootaddr, bootline,
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max(strlen(bootline), (size_t)255));
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flush_cache(bootaddr, max(strlen(bootline),
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(size_t)255));
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} else {
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tmp = getenv("bootdev");
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if (tmp)
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ptr = sprintf(build_buf, tmp);
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else
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printf("## VxWorks boot device not specified\n");
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tmp = getenv("bootfile");
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if (tmp)
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ptr += sprintf(build_buf + ptr,
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"host:%s ", tmp);
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else
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ptr += sprintf(build_buf + ptr,
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"host:vxWorks ");
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/*
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* The following parameters are only needed if 'bootdev'
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* is an ethernet device, otherwise they are optional.
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*/
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tmp = getenv("ipaddr");
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if (tmp) {
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ptr += sprintf(build_buf + ptr, "e=%s", tmp);
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tmp = getenv("netmask");
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if (tmp) {
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u32 mask = getenv_ip("netmask").s_addr;
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ptr += sprintf(build_buf + ptr,
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":%08x ", ntohl(mask));
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} else {
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ptr += sprintf(build_buf + ptr, " ");
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}
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}
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tmp = getenv("serverip");
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if (tmp)
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ptr += sprintf(build_buf + ptr, "h=%s ", tmp);
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tmp = getenv("gatewayip");
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if (tmp)
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ptr += sprintf(build_buf + ptr, "g=%s ", tmp);
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tmp = getenv("hostname");
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if (tmp)
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ptr += sprintf(build_buf + ptr, "tn=%s ", tmp);
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tmp = getenv("othbootargs");
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if (tmp)
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ptr += sprintf(build_buf + ptr, tmp);
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memcpy((void *)bootaddr, build_buf,
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max(strlen(build_buf), (size_t)255));
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flush_cache(bootaddr, max(strlen(build_buf),
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(size_t)255));
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}
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printf("## Using bootline (@ 0x%lx): %s\n", bootaddr,
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(char *)bootaddr);
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}
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#ifdef CONFIG_X86
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/*
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* Since E820 information is critical to the kernel, if we don't
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* specify these in the environments, use a default one.
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*/
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tmp = getenv("e820data");
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if (tmp)
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data = (struct e820entry *)simple_strtoul(tmp, NULL, 16);
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else
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data = (struct e820entry *)VXWORKS_E820_DATA_ADDR;
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tmp = getenv("e820info");
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if (tmp)
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info = (struct e820info *)simple_strtoul(tmp, NULL, 16);
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else
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info = (struct e820info *)VXWORKS_E820_INFO_ADDR;
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memset(info, 0, sizeof(struct e820info));
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info->sign = E820_SIGNATURE;
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info->entries = install_e820_map(E820MAX, data);
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info->addr = (info->entries - 1) * sizeof(struct e820entry) +
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VXWORKS_E820_DATA_ADDR;
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#endif
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/*
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* If the data at the load address is an elf image, then
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* treat it like an elf image. Otherwise, assume that it is a
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* binary image.
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*/
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if (valid_elf_image(addr))
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addr = load_elf_image_shdr(addr);
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else
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puts("## Not an ELF image, assuming binary\n");
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printf("## Starting vxWorks at 0x%08lx ...\n", addr);
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dcache_disable();
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#ifdef CONFIG_X86
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/* VxWorks on x86 uses stack to pass parameters */
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((asmlinkage void (*)(int))addr)(0);
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#else
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((void (*)(int))addr)(0);
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#endif
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puts("## vxWorks terminated\n");
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return 1;
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}
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U_BOOT_CMD(
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bootelf, 3, 0, do_bootelf,
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"Boot from an ELF image in memory",
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"[-p|-s] [address]\n"
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"\t- load ELF image at [address] via program headers (-p)\n"
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"\t or via section headers (-s)"
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);
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U_BOOT_CMD(
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bootvx, 2, 0, do_bootvx,
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"Boot vxWorks from an ELF image",
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" [address] - load address of vxWorks ELF image."
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);
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