68300

Roy,
We had a similar problem in the past.  Here is a snippet of code which will
save all the pertinent information on the stack so that you can look at it
with the debugger after an error occurs.

Good luck,
Cathy

************************************************************************

C file

   tULONG bus_error_pc_return;
   tULONG bus_error_fault_address;
   tULONG bus_error_pc_current;

ASM File


    XDEF _bus_error_pc_return
    XDEF _bus_error_fault_address
    XDEF _bus_error_pc_current

;********************************************************************
; BUS ERROR IRQ    Gets BERR frame off stack  See CPU32 manual 6-29
;********************************************************************

BUS_ERROR_IRQ:

    LINK A6,#0            ;get SP into A6
    MOVE.L (+$06,A6), _bus_error_pc_return      ;put SP+2 in A0  return PC
    MOVE.L (+$0C,A6), _bus_error_fault_address  ;put SP+8 in A1  faulted
address
    MOVE.L (+$14,A6), _bus_error_pc_current     ;put SP+10 in A2 current PC

    JMP _bus_error_handler
    RTE

;********************************************************************
; ADDRESS ERROR IRQ    Gets BERR frame off stack  See CPU32 manual 6-29
;********************************************************************

ADDRESS_ERROR_IRQ:

    LINK A6,#0            ;get SP into A6
    MOVE.L (+$06,A6), _bus_error_pc_return      ;put SP+2 in A0  return PC
    MOVE.L (+$0C,A6), _bus_error_fault_address  ;put SP+8 in A1  faulted
address
    MOVE.L (+$14,A6), _bus_error_pc_current     ;put SP+10 in A2 current PC

    JMP _address_error_handler
    RTE




                                                                                                                                       
                      Roy                                                                                                              
                      <spectric@yahoo.c        To:       68300@yahoogroups.com                                                         
                      om>                      cc:                                                                                     
                                               Subject:  [68300] stack frames                                                          
                      05/15/02 07:46 AM                                                                                                
                      Please respond to                                                                                                
                      68300                                                                                                            
                                                                                                                                       
                                                                                                                                       




Hi all

I am having problems trying to find the source of an
address error that causes an exception.

The SSP contains the address of the stack frame, the
format code should tell me the stack frame size, 4, 6
or BERR frame.  From this I should beable to locate
the address of the offending code that causes the
error but am not having much success, can anyone
provide more info or advice.

               thanks Roy

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