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cbfstool: add ELF header initialization helper

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In order for one to extract ELF files from cbfs it's
helpful to have common code which creates a default
executable ELF header for the provided constraints.

BUG=None
TEST=With follow up patch am able to extract out romstage
     as an ELF file.

Change-Id: Ib8f2456f41b79c6c0430861e33e8b909725013f1
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/12218
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
This commit is contained in:
Aaron Durbin
2015-10-27 16:21:55 -05:00
parent 1762502929
commit 4f930c9649
2 changed files with 35 additions and 0 deletions
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24
util/cbfstool/elfheaders.c
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@@ -635,6 +635,30 @@ elf_headers(const struct buffer *pinput,
* +------------------+
*/
void elf_init_eheader(Elf64_Ehdr *ehdr, int machine, int nbits, int endian)
{
memset(ehdr, 0, sizeof(*ehdr));
ehdr->e_ident[EI_MAG0] = ELFMAG0;
ehdr->e_ident[EI_MAG1] = ELFMAG1;
ehdr->e_ident[EI_MAG2] = ELFMAG2;
ehdr->e_ident[EI_MAG3] = ELFMAG3;
ehdr->e_ident[EI_CLASS] = nbits;
ehdr->e_ident[EI_DATA] = endian;
ehdr->e_ident[EI_VERSION] = EV_CURRENT;
ehdr->e_type = ET_EXEC;
ehdr->e_machine = machine;
ehdr->e_version = EV_CURRENT;
if (nbits == ELFCLASS64) {
ehdr->e_ehsize = sizeof(Elf64_Ehdr);
ehdr->e_phentsize = sizeof(Elf64_Phdr);
ehdr->e_shentsize = sizeof(Elf64_Shdr);
} else {
ehdr->e_ehsize = sizeof(Elf32_Ehdr);
ehdr->e_phentsize = sizeof(Elf32_Phdr);
ehdr->e_shentsize = sizeof(Elf32_Shdr);
}
}
/* Arbitray maximum number of sections. */
#define MAX_SECTIONS 16
struct elf_writer_section {