[ECOS] Re: powerpc-eabi-gdb woes [Followup]

Jamie Guinan guinan@bluebutton.com
Thu Oct 28 17:26:00 GMT 1999


On Tue, 26 Oct 1999, Jamie Guinan wrote:
> 
> Hi all,
> 
> I'm working with an MBX board, MPC821 @ 40Mhz.
> 
> I've run into a few problems with powerpc-eabi-gdb, and
> I wanted to see if anyone else has seen similar problems.
> 
> 1) GDB prints insane values for local variables.  I found
> this while debugging a simple program without eCos (GDB is
> using the GDB stub in ROM in this case), and without
> optimization.
> 
> Test case:
> http://www.bluebutton.com/ecos-discuss/10-26-1999/test5/Makefile
> http://www.bluebutton.com/ecos-discuss/10-26-1999/test5/test5.c
> 
> Test session:
> $ powerpc-eabi-gdb -b 38400 test5
> (gdb) target remote /dev/ttyS0
> (gdb) load
> ...
> (gdb) b main
> (gdb) cont
> ...
> Breakpoint 1, main () at test5.c:21
> 21	  i=90;
> (gdb) n
> 22	  j=99;
> (gdb) p i
> $1 = 2087191462
> ^^^^^^^^^^^^^^^

For future readers of the ecos-discuss mail archives, the
GDB insane values problem has a simple fix.  After running
pkgconf.tcl, edit pkgconf/hal.h and set the following,

#undef  CYGDBG_HAL_COMMON_INTERRUPTS_SAVE_MINIMUM_CONTEXT
#undef  CYGDBG_HAL_COMMON_CONTEXT_SAVE_MINIMUM 

-Jamie




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