nkeynes@359: /**
nkeynes@368:  * $Id: sh4trans.c,v 1.2 2007-09-04 08:40:23 nkeynes Exp $
nkeynes@359:  * 
nkeynes@359:  * SH4 translation core module. This part handles the non-target-specific
nkeynes@359:  * section of the translation.
nkeynes@359:  *
nkeynes@359:  * Copyright (c) 2005 Nathan Keynes.
nkeynes@359:  *
nkeynes@359:  * This program is free software; you can redistribute it and/or modify
nkeynes@359:  * it under the terms of the GNU General Public License as published by
nkeynes@359:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@359:  * (at your option) any later version.
nkeynes@359:  *
nkeynes@359:  * This program is distributed in the hope that it will be useful,
nkeynes@359:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@359:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@359:  * GNU General Public License for more details.
nkeynes@359:  */
nkeynes@359: 
nkeynes@359: #include "sh4core.h"
nkeynes@359: #include "sh4trans.h"
nkeynes@359: #include "xltcache.h"
nkeynes@359: 
nkeynes@359: /**
nkeynes@359:  * Execute a timeslice using translated code only (ie translate/execute loop)
nkeynes@359:  * Note this version does not support breakpoints
nkeynes@359:  */
nkeynes@359: uint32_t sh4_xlat_run_slice( uint32_t nanosecs ) 
nkeynes@359: {
nkeynes@368:     int i;
nkeynes@359:     sh4r.slice_cycle = 0;
nkeynes@359: 
nkeynes@359:     if( sh4r.sh4_state != SH4_STATE_RUNNING ) {
nkeynes@359: 	if( sh4r.event_pending < nanosecs ) {
nkeynes@359: 	    sh4r.sh4_state = SH4_STATE_RUNNING;
nkeynes@359: 	    sh4r.slice_cycle = sh4r.event_pending;
nkeynes@359: 	}
nkeynes@359:     }
nkeynes@359: 
nkeynes@368:     while( sh4r.slice_cycle < nanosecs ) {
nkeynes@359: 	if( SH4_EVENT_PENDING() ) {
nkeynes@359: 	    if( sh4r.event_types & PENDING_EVENT ) {
nkeynes@359: 		event_execute();
nkeynes@359: 	    }
nkeynes@359: 	    /* Eventq execute may (quite likely) deliver an immediate IRQ */
nkeynes@359: 	    if( sh4r.event_types & PENDING_IRQ ) {
nkeynes@359: 		sh4_accept_interrupt();
nkeynes@359: 	    }
nkeynes@359: 	}
nkeynes@359: 
nkeynes@368: 	gboolean (*code)() = xlat_get_code(sh4r.pc);
nkeynes@359: 	if( code == NULL ) {
nkeynes@359: 	    code = sh4_translate_basic_block( sh4r.pc );
nkeynes@359: 	}
nkeynes@368: 	if( !code() )
nkeynes@368: 	    break;
nkeynes@359:     }
nkeynes@359: 
nkeynes@359:     /* If we aborted early, but the cpu is still technically running,
nkeynes@359:      * we're doing a hard abort - cut the timeslice back to what we
nkeynes@359:      * actually executed
nkeynes@359:      */
nkeynes@359:     if( sh4r.slice_cycle < nanosecs && sh4r.sh4_state == SH4_STATE_RUNNING ) {
nkeynes@359: 	nanosecs = sh4r.slice_cycle;
nkeynes@359:     }
nkeynes@359:     if( sh4r.sh4_state != SH4_STATE_STANDBY ) {
nkeynes@359: 	TMU_run_slice( nanosecs );
nkeynes@359: 	SCIF_run_slice( nanosecs );
nkeynes@359:     }
nkeynes@359:     return nanosecs;
nkeynes@359: }
nkeynes@359: 
nkeynes@359: uint8_t *xlat_output;
nkeynes@359: 
nkeynes@359: /**
nkeynes@359:  * Translate a linear basic block, ie all instructions from the start address
nkeynes@359:  * (inclusive) until the next branch/jump instruction or the end of the page
nkeynes@359:  * is reached.
nkeynes@359:  * @return the address of the translated block
nkeynes@359:  * eg due to lack of buffer space.
nkeynes@359:  */
nkeynes@359: void * sh4_translate_basic_block( sh4addr_t start )
nkeynes@359: {
nkeynes@359:     uint32_t pc = start;
nkeynes@359:     int done;
nkeynes@359:     xlat_cache_block_t block = xlat_start_block( start );
nkeynes@359:     xlat_output = (uint8_t *)block->code;
nkeynes@359:     uint8_t *eob = xlat_output + block->size;
nkeynes@359:     sh4_translate_begin_block();
nkeynes@359: 
nkeynes@359:     while( (done = sh4_x86_translate_instruction( pc )) == 0 ) {
nkeynes@359: 	if( eob - xlat_output < MAX_INSTRUCTION_SIZE ) {
nkeynes@359: 	    uint8_t *oldstart = block->code;
nkeynes@359: 	    block = xlat_extend_block();
nkeynes@359: 	    xlat_output = block->code + (xlat_output - oldstart);
nkeynes@359: 	    eob = block->code + block->size;
nkeynes@359: 	}
nkeynes@359: 	pc += 2;
nkeynes@359:     }
nkeynes@368:     sh4_translate_end_block(pc);
nkeynes@368:     xlat_commit_block( xlat_output - block->code, pc-start );
nkeynes@359:     return block->code;
nkeynes@359: }
nkeynes@359: 
nkeynes@359: