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/* debugger.c: Fuse's monitor/debugger
Copyright (c) 2002-2008 Philip Kendall
$Id: debugger.c 3686 2008-06-21 14:33:22Z pak21 $
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Author contact information:
E-mail: philip-fuse@shadowmagic.org.uk
*/
#include <config.h>
#include "debugger.h"
#include "debugger_internals.h"
#include "event.h"
#include "fuse.h"
#include "memory.h"
#include "mempool.h"
#include "periph.h"
#include "ui/ui.h"
#include "z80/z80.h"
#include "z80/z80_macros.h"
/* The current activity state of the debugger */
enum debugger_mode_t debugger_mode;
/* Which base should we display things in */
int debugger_output_base;
/* Memory pool used by the lexer and parser */
int debugger_memory_pool;
/* The event type used for time breakpoints */
int debugger_breakpoint_event;
int
debugger_init( void )
{
int error;
debugger_breakpoints = NULL;
debugger_output_base = 16;
debugger_memory_pool = mempool_register_pool();
if( debugger_memory_pool == -1 ) return 1;
debugger_breakpoint_event = event_register( debugger_breakpoint_time_fn, "Breakpoint" );
if( debugger_breakpoint_event == -1 ) return 1;
error = debugger_event_init();
if( error ) return error;
error = debugger_variable_init();
if( error ) return error;
error = debugger_reset();
if( error ) return error;
return 0;
}
int
debugger_reset( void )
{
debugger_breakpoint_remove_all();
debugger_mode = DEBUGGER_MODE_INACTIVE;
return 0;
}
int
debugger_end( void )
{
debugger_breakpoint_remove_all();
return 0;
}
/* Activate the debugger */
int
debugger_trap( void )
{
return ui_debugger_activate();
}
/* Step one instruction */
int
debugger_step( void )
{
debugger_mode = DEBUGGER_MODE_HALTED;
ui_debugger_deactivate( 0 );
return 0;
}
/* Step to the next instruction, ignoring CALLs etc */
int
debugger_next( void )
{
size_t length;
/* Find out how long the current instruction is */
debugger_disassemble( NULL, 0, &length, PC );
/* And add a breakpoint after that */
debugger_breakpoint_add_address( DEBUGGER_BREAKPOINT_TYPE_EXECUTE, -1,
PC + length, 0,
DEBUGGER_BREAKPOINT_LIFE_ONESHOT, NULL );
debugger_run();
return 0;
}
/* Set debugger_mode so that emulation will occur */
int
debugger_run( void )
{
debugger_mode = debugger_breakpoints ?
DEBUGGER_MODE_ACTIVE :
DEBUGGER_MODE_INACTIVE;
ui_debugger_deactivate( 1 );
return 0;
}
/* Exit from the last CALL etc by setting a oneshot breakpoint at
(SP) and then starting emulation */
int
debugger_breakpoint_exit( void )
{
libspectrum_word target;
target = readbyte_internal( SP ) + 0x100 * readbyte_internal( SP+1 );
if( debugger_breakpoint_add_address(
DEBUGGER_BREAKPOINT_TYPE_EXECUTE, -1, target, 0,
DEBUGGER_BREAKPOINT_LIFE_ONESHOT, NULL
)
)
return 1;
if( debugger_run() ) return 1;
return 0;
}
/* Poke a value into RAM */
int
debugger_poke( libspectrum_word address, libspectrum_byte value )
{
writebyte_internal( address, value );
return 0;
}
/* Write a value to a port */
int
debugger_port_write( libspectrum_word port, libspectrum_byte value )
{
writeport_internal( port, value );
return 0;
}
/* Exit the emulator */
void
debugger_exit_emulator( void )
{
fuse_exiting = 1;
/* Ensure we break out of the main Z80 loop immediately */
event_add( 0, event_type_null );
debugger_run();
}
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