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bfd_set_section_contents
.
Any program that creates or combines sections (e.g., the assembler
and linker) must use the asection
fields output_section
and
output_offset
to indicate the file sections to which each
section must be written. (If the section is being created from
scratch, output_section
should probably point to the section
itself and output_offset
should probably be zero.)
The data to be written comes from input sections attached
(via output_section
pointers) to
the output sections. The output section structure can be
considered a filter for the input section: the output section
determines the vma of the output data and the name, but the
input section determines the offset into the output section of
the data to be written.
E.g., to create a section "O", starting at 0x100, 0x123 long,
containing two subsections, "A" at offset 0x0 (i.e., at vma
0x100) and "B" at offset 0x20 (i.e., at vma 0x120) the asection
structures would look like:
section name "A" output_offset 0x00 size 0x20 output_section -----------> section name "O" | vma 0x100 section name "B" | size 0x123 output_offset 0x20 | size 0x103 | output_section --------| |