[task #6537] Implement ddb/db_elf.c

[Andrei Barbu]

Follow-up Comment #1, task #6537 (project hurd):

Two patches that add this. The first extends symbol_values to take the symbol
table as an argument, this is required for ELF. The second adds db_elf.c as
well as a whole bunch of support files, enables ELF and adds it to model_dep.
It also sets ELF as the default type, I don't think anyone still builds Mach
as an a.out.

line_at_pc is not implemented at the moment. The above patch doesn't do any
DWARF2 lookups, just symtab. All the other features should be fine.

The ELF headers are from FreeBSD, they have a nice way of dealing with
32/64bit versions so we're 64bit compatible. 

(file #15645, file #15646)
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Additional Item Attachment:

File name: symbol_values.patch            Size:1 KB
File name: elf.patch                      Size:71 KB


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