cbfstool: add ELF header initialization helper
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>
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@@ -635,6 +635,30 @@ elf_headers(const struct buffer *pinput,
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* +------------------+
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*/
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void elf_init_eheader(Elf64_Ehdr *ehdr, int machine, int nbits, int endian)
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{
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memset(ehdr, 0, sizeof(*ehdr));
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ehdr->e_ident[EI_MAG0] = ELFMAG0;
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ehdr->e_ident[EI_MAG1] = ELFMAG1;
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ehdr->e_ident[EI_MAG2] = ELFMAG2;
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ehdr->e_ident[EI_MAG3] = ELFMAG3;
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ehdr->e_ident[EI_CLASS] = nbits;
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ehdr->e_ident[EI_DATA] = endian;
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ehdr->e_ident[EI_VERSION] = EV_CURRENT;
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ehdr->e_type = ET_EXEC;
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ehdr->e_machine = machine;
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ehdr->e_version = EV_CURRENT;
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if (nbits == ELFCLASS64) {
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ehdr->e_ehsize = sizeof(Elf64_Ehdr);
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ehdr->e_phentsize = sizeof(Elf64_Phdr);
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ehdr->e_shentsize = sizeof(Elf64_Shdr);
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} else {
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ehdr->e_ehsize = sizeof(Elf32_Ehdr);
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ehdr->e_phentsize = sizeof(Elf32_Phdr);
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ehdr->e_shentsize = sizeof(Elf32_Shdr);
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}
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}
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/* Arbitray maximum number of sections. */
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#define MAX_SECTIONS 16
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struct elf_writer_section {
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