Marco van de Voort wrote:

> You'll be able to return the favour, don't worry :-) 
> 
> I'll be trying to port our compiler (Free Pascal) to NetBSD/m(ac)68k, and
> only have some very basic m68k assembler skills:-)

I also only have very basic m68k skills. But if you have problems I'll
try to help.
 
> > But now I encounter another problem: gdb breakpoints don't work:
> 
> Hmm, odd. Maybe it doesn't work for entry points. 

Yes, this was it. With the following change the breakpoint works:


_start:
        nop

break_adr:
        pea     mlen


But gdb crashes later :-(

mac68k:~/nethome/devel/asm/simple/m68k-nbsd$ gdb ./ahello1 
GNU gdb 5.0nb1
Copyright 2000 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "m68k--netbsdelf"...(no debugging symbols found)...
(gdb) break break_adr
Breakpoint 1 at 0x20ae
(gdb) r
Starting program: /net/sol/home/chris/devel/asm/simple/m68k-nbsd/./ahello1 

Breakpoint 1, 0x20ae in break_adr ()
(gdb) inf reg
d0             0x0      0
d1             0x0      0
d2             0x0      0
d3             0x0      0
d4             0x0      0
d5             0x0      0
d6             0x0      0
d7             0x0      0
a0             0x0      0x0
a1             0x0      0x0
a2             0xffffcff0       0xffffcff0
a3             0x0      0x0
a4             0x0      0x0
a5             0x0      0x0
fp             0x0      0x0
sp             0xffffcb38       0xffffcb38
ps             0x0      0x0
pc             0x20ae   0x20ae
Segmentation fault (core dumped)

regards,
chris