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- -----------------------------------------------------------------------------
-
-
- SIMBug
-
- Preliminary S.I.M. Debug Server
- Version 0.61
-
- Copyright © 1990-1993 by Stefan Walter
- ALL RIGHTS RESERVED
-
- -----------------------------------------------------------------------------
-
-
-
-
-
- Documentation
-
-
- last edited on: 13.03.93
-
-
-
-
-
- =============================================================================
- 1. Introduction
- =============================================================================
-
-
- SIMBug provides an easy way to use SIM as debugger for different kinds of
- programs: Executables, bootblocks, files, tasks and programs that are
- already in memory.
-
- Support of multiple task debugging is still only not available. You also
- should not run two copies of SIMBug because they both share the same copy of
- SIM.
-
- This version is still only preliminary and not quite comfortable.
-
-
-
-
- =============================================================================
- 2. Startup
- =============================================================================
-
-
- SIMBug can only be started from CLI, not from Workbench. When started, SIM
- looks for the system symbols definition file which, if available, is loaded
- and compiled to a symbol list. If no SIM is in memory yet, SIMBug
- automatically enters the SIM load menu.
-
-
-
-
- =============================================================================
- 3. Commands
- =============================================================================
-
-
- The following case unsensitive commands are known by SIMBug:
-
-
- Quits SIMBug.
-
-
- Lists all commands.
-
-
- k Removes a previously installed copy of SIM and frees the
- memory if it was allocated. This command needs to be called
- when you need to load a fresh copy of SIM.
-
-
- s Loads SIM. SIMBug first determines a suitable location for
- SIM, display and backup. SIM is searched in the current
- directory, 'C:', 'DH0:', 'C+:' and 'DF0:'. Then you are
- asked the address for SIM, display and backup. By entering
- nothing, the computed default values printed in brackets are
- used.
-
- You can then either allocate memory for SIM or not, default
- is to do so. Finally you need to confirm if all entered
- addresses are right.
-
-
- e Simply enters SIM through the JSR entrance. The PC then
- points somewhere in SIMBug. This function is mainly
- supported for short calls to SIM. You should not change the
- PC or stack.
-
-
- l Debugs an executable. You are asked for the name of the
- program and a command line which is then passed to the
- program in a0/d0.
-
- After sucessfully loading the executable, SIMBug scans the
- hunk structure for symbol hunks. If it encounters any, a
- symbol list is created.
-
- After the program terminates, SIMBug waits for you to press
- <CR> once more before it frees symbol lists and unloads the
- program. Useful if the program detaches from CLI.
-
-
- b Debugs a bootblock. You are asked for the drive number from
- which to load the bootblock. Only DF0:-DF3: are allowed.
- The bootblock of that drive is loaded to an allocated block
- of chip memory.
-
-
- f Debugs a file. You are asked for the file name and the
- address to which it shall be loaded. If no address is
- specified, the default address is used. Memory is allocated,
- if it can't, the command fails.
-
- The PC is set to the start of the file in memory.
-
-
- m Debugs a program already in memory. You are asked for the
- address to be used as PC.
-
-
- t Debugs an existing task. You are asked for the task control
- blocks address of the task to intercept. If interception was
- successful, the task enters SIM when it becomes the running
- task again.
-
-
- w Lists all tasks.
-
-
- n Creates a new CLI.
-
-
-
-
- =============================================================================
- 4. BTW
- =============================================================================
-
-
- A loaded copy of SIM is kept resident in memory. Some virus protection
- programs may complain about the resident structure SIMBug creates for that
- purpose.
-
- When debugging anything except tasks, the processing power of the CLI process
- of SIMBug is used.
-
-
-
-
- =============================================================================
- 5. The Quit Feature
- =============================================================================
-
- SIMBug uses the debug server entrance of SIM when debugging executables,
- files, bootblocks and programs in memory, thus enabling aborting the program.
-
- By leaving SIM with one of the quit commands or shortcuts, SIMBug is called
- again. You can then either continue debugging or abort the program. If you
- abort, the program is unloaded but resources allocated by the program are not
- freed. The continue function is useful if you need to suspend debugging and
- temporarily work on something else.
-
- The quit feature only works if the running task is the CLI process of SIMBug.
- If you quit SIM from the wrong process, a requester pops up. You can then
- choose to either continue or to suspend the process.
-
-
-
-
- =============================================================================
- 6. Bugs
- =============================================================================
-
-
- If you find any bugs in SIMBug, the system symbol definition files or SIM,
- you are kindly asked to report these to me in order to get them fixed.
- Please look at the end of the documentation of SIM for both my physical or
- e-mail address.
-
-
-
- Happy bug-hunting! :)
-
-