🚀 go-pugleaf

I.G.Batten@fulcrum.bt.co.uk (Ian G Batten) (me) writes:
> 
> I'm tidying up a port of gdb 3.5 to the local System V.3 680[23]0
> machines.  I have two outstanding problems

> (2) The V.3 machines are compiled entirely with gcc 1.35.  Therefore
> small structures are returned in a set of registers.  If a function is
> written which returns a structure, executing it from a print or set
> (again!) errors as the structure doesn't seem to be where it's expected.
> Moreover, I can't see any code to do this right.  Anyone have any ideas?

There is code to do this, but it doesn't work quite right.

Firstly, the gcc_compile_flag in the block structure needs to be driven
to 1.  I can't see a way to look at COFF stuff and see which compiler
was used, so since the machine only has gcc I've simply set this flag to
one.

This made one word structures work, and 3 word structures worked OK, but
failed for two.  I believe this problem is generic; I suggest that the
line

      if (!(BLOCK_GCC_COMPILED (b) && TYPE_LENGTH (value_type) < 8))

at line 976 in values.c should be

      if (!(BLOCK_GCC_COMPILED (b) && TYPE_LENGTH (value_type) <= 8))

to handle the case of two word structures being returned in registers
(in my case d0 and d1).

ian

-- 
Ian G Batten, BT Fulcrum - igb@fulcrum.bt.co.uk - ...!uunet!ukc!fulcrum!igb