[U-Boot] [PATCH 3/4] elf: Add a very simple elf64 loader

[Calvin Johnson <linux.cj@gmail.com>]

On Mon, Apr 09, 2018 at 11:28:30PM -0700, Bin Meng wrote:
> This adds a very simple elf64 loader via program headers, similar
> to load_elf_image_phdr() that we already have.
> 
> Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
> ---
> 
>  cmd/elf.c | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/cmd/elf.c b/cmd/elf.c
> index 501f935..91a04da 100644
> --- a/cmd/elf.c
> +++ b/cmd/elf.c
> @@ -24,6 +24,37 @@
>  #endif
>  
>  /*
> + * A very simple elf64 loader, assumes the image is valid, returns the
> + * entry point address.
> + */
> +static unsigned long load_elf64_image_phdr(unsigned long addr)
> +{
> +	Elf64_Ehdr *ehdr; /* Elf header structure pointer */
> +	Elf64_Phdr *phdr; /* Program header structure pointer */
> +	int i;
> +
> +	ehdr = (Elf64_Ehdr *)addr;
> +	phdr = (Elf64_Phdr *)(addr + (ulong)ehdr->e_phoff);
> +
> +	/* Load each program header */
> +	for (i = 0; i < ehdr->e_phnum; ++i) {
> +		void *dst = (void *)(ulong)phdr->p_paddr;
> +		void *src = (void *)addr + phdr->p_offset;
> +		debug("Loading phdr %i to 0x%p (%lu bytes)\n",
> +		      i, dst, (ulong)phdr->p_filesz);
> +		if (phdr->p_filesz)
> +			memcpy(dst, src, phdr->p_filesz);
> +		if (phdr->p_filesz != phdr->p_memsz)
> +			memset(dst + phdr->p_filesz, 0x00,
> +			       phdr->p_memsz - phdr->p_filesz);
> +		flush_cache((unsigned long)dst, phdr->p_filesz);
> +		++phdr;
> +	}
> +
> +	return ehdr->e_entry;
> +}
> +
> +/*
>   * A very simple elf loader, assumes the image is valid, returns the
Would it be good to modify this comment to indicate elf32 loader?
>   * entry point address.
>   */
> @@ -34,6 +65,9 @@ static unsigned long load_elf_image_phdr(unsigned long addr)
>  	int i;
>  
>  	ehdr = (Elf32_Ehdr *)addr;
> +	if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
> +		return load_elf64_image_phdr(addr);
> +
>  	phdr = (Elf32_Phdr *)(addr + ehdr->e_phoff);
>  
>  	/* Load each program header */
> -- 
> 2.7.4
> 
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