linux-imx

/*

 * Remote Processor Framework Elf loader

 *

 * Copyright (C) 2011 Texas Instruments, Inc.

 * Copyright (C) 2011 Google, Inc.

 *

 * Ohad Ben-Cohen <ohad@wizery.com>

 * Brian Swetland <swetland@google.com>

 * Mark Grosen <mgrosen@ti.com>

 * Fernando Guzman Lugo <fernando.lugo@ti.com>

 * Suman Anna <s-anna@ti.com>

 * Robert Tivy <rtivy@ti.com>

 * Armando Uribe De Leon <x0095078@ti.com>

 * Sjur Brændeland <sjur.brandeland@stericsson.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

​

#define pr_fmt(fmt)    "%s: " fmt, __func__

​

#include <linux/module.h>

#include <linux/firmware.h>

#include <linux/remoteproc.h>

#include <linux/elf.h>

​

#include "remoteproc_internal.h"

​

/**

 * rproc_elf_sanity_check() - Sanity Check ELF firmware image

 * @rproc: the remote processor handle

 * @fw: the ELF firmware image

 *

 * Make sure this fw image is sane.

 */

int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw)

{

    const char *name = rproc->firmware;

    struct device *dev = &rproc->dev;

    struct elf32_hdr *ehdr;

    char class;

​

    if (!fw) {

        dev_err(dev, "failed to load %s\n", name);

        return -EINVAL;

    }

​

    if (fw->size < sizeof(struct elf32_hdr)) {

        dev_err(dev, "Image is too small\n");

        return -EINVAL;

    }

​

    ehdr = (struct elf32_hdr *)fw->data;

​

    /* We only support ELF32 at this point */

    class = ehdr->e_ident[EI_CLASS];

    if (class != ELFCLASS32) {

        dev_err(dev, "Unsupported class: %d\n", class);

        return -EINVAL;

    }

​

    /* We assume the firmware has the same endianness as the host */

# ifdef __LITTLE_ENDIAN

    if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {

# else /* BIG ENDIAN */

    if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB) {

# endif

        dev_err(dev, "Unsupported firmware endianness\n");

        return -EINVAL;

    }

​

    if (fw->size < ehdr->e_shoff + sizeof(struct elf32_shdr)) {

        dev_err(dev, "Image is too small\n");

        return -EINVAL;

    }

​

    if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) {

        dev_err(dev, "Image is corrupted (bad magic)\n");

        return -EINVAL;

    }

​

    if (ehdr->e_phnum == 0) {

        dev_err(dev, "No loadable segments\n");

        return -EINVAL;

    }

​