You asked:

How do we make sure in file
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/i86pc/unix/Makefile
that the embedded 32-bit code remains within the 1st 8K of the
elf64 image?

The mapfiles used to link unix specifically put the dboot PT_LOAD
section first. Look at usr/src/uts/i86pc/conf/Mapfile[.amd64]
Sections are put into the ELF file in the order they appear in the
mapfile.
 
 
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