On Wed, Apr 11, 2018 at 3:04 AM, Calvin Johnson <linux...@gmail.com> wrote:
> 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...@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?
Will add some more comments in v2.
Regards,
Bin
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