source: rtems/bsps/m68k/mcf52235/gdb-init

#
# Show the exception stack frame.
#
define show-exception-sframe
 set $frsr = *(unsigned short *)((unsigned long)$sp + 2)
 set $frpc = *(unsigned long *)((unsigned long)$sp + 4)
 set $frfvo = *(unsigned short *)((unsigned long)$sp + 0)
 set $frcode = $frfvo >> 12
 set $frvect = ($frfvo & 0xFFF) >> 2
 set $frstatus = ((($frfvo >> 10) & 3) << 2) | ($frfvo & 3)
 printf "EXCEPTION -- SR:0x%X  PC:0x%X  FRAME:0x%x  VECTOR:%d  STATUS:%d\n", $frsr, $frpc, $frcode, $frvect, $frstatus
 if $frstatus == 4
  printf " Fault Type: Error on instruction fetch"
 end
 if $frstatus == 8
  printf " Fault Type: Error on operand write"
 end
 if $frstatus == 12
  printf " Fault Type: Error on operand read"
 end
 if $frstatus == 9
  printf " Fault Type: Attempted write to write-protected space"
 end
end

# Add -v and -d flags for bdm info
# Add -B flags to utilize hardware breakpoints when they are availiable

#target remote | m68k-bdm-gdbserver pipe /dev/bdmcf0
target remote | m68k-bdm-gdbserver pipe /dev/tblcf2 -B
#monitor set remote-debug 1

monitor bdm-reset

# Set VBR to the beginning of what will be SRAM
monitor bdm-ctl-set 0x0801 0x20000000

# Set RAMBAR1
monitor bdm-ctl-set 0x0C05 0x20000021

# Set FLASHBAR
monitor bdm-ctl-set 0x0C04 0x00000061

# Enable PST[3:0] signals
set *((char*) 0x40100074) = 0x0F

# Add the load when debugging from ram which won't happen with rtems!
#load