nkeynes@359: /**
nkeynes@586:  * $Id$
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@398: #include <assert.h>
nkeynes@586: #include <setjmp.h>
nkeynes@430: #include "eventq.h"
nkeynes@430: #include "syscall.h"
nkeynes@586: #include "clock.h"
nkeynes@430: #include "sh4/sh4core.h"
nkeynes@430: #include "sh4/sh4trans.h"
nkeynes@430: #include "sh4/xltcache.h"
nkeynes@359: 
nkeynes@586: 
nkeynes@586: static jmp_buf xlat_jmp_buf;
nkeynes@586: static gboolean xlat_running = FALSE;
nkeynes@586: 
nkeynes@586: gboolean sh4_xlat_is_running()
nkeynes@586: {
nkeynes@586:     return xlat_running;
nkeynes@586: }
nkeynes@586: 
nkeynes@359: /**
nkeynes@359:  * Execute a timeslice using translated code only (ie translate/execute loop)
nkeynes@359:  */
nkeynes@359: uint32_t sh4_xlat_run_slice( uint32_t nanosecs ) 
nkeynes@359: {
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@586:     switch( setjmp(xlat_jmp_buf) ) {
nkeynes@586:     case XLAT_EXIT_BREAKPOINT:
nkeynes@586: 	sh4_clear_breakpoint( sh4r.pc, BREAK_ONESHOT );
nkeynes@586: 	/* fallthrough */
nkeynes@586:     case XLAT_EXIT_HALT:
nkeynes@586: 	if( sh4r.sh4_state != SH4_STATE_STANDBY ) {
nkeynes@586: 	    TMU_run_slice( sh4r.slice_cycle );
nkeynes@586: 	    SCIF_run_slice( sh4r.slice_cycle );
nkeynes@586: 	    dreamcast_stop();
nkeynes@586: 	    return sh4r.slice_cycle;
nkeynes@586: 	}
nkeynes@586:     case XLAT_EXIT_SYSRESET:
nkeynes@586: 	dreamcast_reset();
nkeynes@586: 	break;
nkeynes@586:     }
nkeynes@586:     
nkeynes@586:     xlat_running = TRUE;
nkeynes@408:     void * (*code)() = NULL;
nkeynes@368:     while( sh4r.slice_cycle < nanosecs ) {
nkeynes@408: 	if( sh4r.event_pending <= sh4r.slice_cycle ) {
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@408: 		code = NULL;
nkeynes@359: 	    }
nkeynes@359: 	}
nkeynes@408: 	
nkeynes@417: 	if( code == NULL ) {
nkeynes@408: 	    if( sh4r.pc > 0xFFFFFF00 ) {
nkeynes@408: 		syscall_invoke( sh4r.pc );
nkeynes@408: 		sh4r.in_delay_slot = 0;
nkeynes@408: 		sh4r.pc = sh4r.pr;
nkeynes@408: 	    }
nkeynes@359: 
nkeynes@586: 	    code = xlat_get_code_by_vma( sh4r.pc );
nkeynes@408: 	    if( code == NULL ) {
nkeynes@408: 		code = sh4_translate_basic_block( sh4r.pc );
nkeynes@408: 	    }
nkeynes@390: 	}
nkeynes@417: 	code = code();
nkeynes@359:     }
nkeynes@359: 
nkeynes@586:     xlat_running = FALSE;
nkeynes@591:     sh4_starting = FALSE;
nkeynes@586: 
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@586: struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
nkeynes@586: uint32_t xlat_recovery_posn;
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@408:     sh4addr_t pc = start;
nkeynes@410:     sh4addr_t lastpc = (pc&0xFFFFF000)+0x1000;
nkeynes@586:     int done, i;
nkeynes@359:     xlat_cache_block_t block = xlat_start_block( start );
nkeynes@359:     xlat_output = (uint8_t *)block->code;
nkeynes@586:     xlat_recovery_posn = 0;
nkeynes@359:     uint8_t *eob = xlat_output + block->size;
nkeynes@588: 
nkeynes@588:     if( GET_ICACHE_END() < lastpc ) {
nkeynes@588: 	lastpc = GET_ICACHE_END();
nkeynes@588:     }
nkeynes@588: 
nkeynes@408:     sh4_translate_begin_block(pc);
nkeynes@359: 
nkeynes@408:     do {
nkeynes@586: 	/* check for breakpoints at this pc */
nkeynes@586: 	for( i=0; i<sh4_breakpoint_count; i++ ) {
nkeynes@586: 	    if( sh4_breakpoints[i].address == pc ) {
nkeynes@586: 		sh4_translate_emit_breakpoint(pc);
nkeynes@586: 		break;
nkeynes@586: 	    }
nkeynes@586: 	}
nkeynes@359: 	if( eob - xlat_output < MAX_INSTRUCTION_SIZE ) {
nkeynes@359: 	    uint8_t *oldstart = block->code;
nkeynes@410: 	    block = xlat_extend_block( xlat_output - oldstart + MAX_INSTRUCTION_SIZE );
nkeynes@359: 	    xlat_output = block->code + (xlat_output - oldstart);
nkeynes@359: 	    eob = block->code + block->size;
nkeynes@359: 	}
nkeynes@527: 	done = sh4_translate_instruction( pc ); 
nkeynes@410: 	assert( xlat_output <= eob );
nkeynes@359: 	pc += 2;
nkeynes@410: 	if ( pc >= lastpc ) {
nkeynes@410: 	    done = 2;
nkeynes@410: 	}
nkeynes@408:     } while( !done );
nkeynes@408:     pc += (done - 2);
nkeynes@410:     if( eob - xlat_output < EPILOGUE_SIZE ) {
nkeynes@410: 	uint8_t *oldstart = block->code;
nkeynes@410: 	block = xlat_extend_block( xlat_output - oldstart + EPILOGUE_SIZE );
nkeynes@410: 	xlat_output = block->code + (xlat_output - oldstart);
nkeynes@410:     }	
nkeynes@368:     sh4_translate_end_block(pc);
nkeynes@586: 
nkeynes@586:     /* Write the recovery records onto the end of the code block */
nkeynes@586:     uint32_t recovery_size = sizeof(struct xlat_recovery_record)*xlat_recovery_posn;
nkeynes@586:     uint32_t finalsize = xlat_output - block->code + recovery_size;
nkeynes@586:     if( finalsize > block->size ) {
nkeynes@586: 	uint8_t *oldstart = block->code;
nkeynes@586: 	block = xlat_extend_block( finalsize );
nkeynes@586: 	xlat_output = block->code + (xlat_output - oldstart);
nkeynes@586:     }
nkeynes@586:     memcpy( xlat_output, xlat_recovery, recovery_size);
nkeynes@586:     block->recover_table = (xlat_recovery_record_t)xlat_output;
nkeynes@586:     block->recover_table_size = xlat_recovery_posn;
nkeynes@586:     xlat_commit_block( finalsize, pc-start );
nkeynes@359:     return block->code;
nkeynes@359: }
nkeynes@359: 
nkeynes@398: /**
nkeynes@586:  * "Execute" the supplied recovery record. Currently this only updates
nkeynes@586:  * sh4r.pc and sh4r.slice_cycle according to the currently executing
nkeynes@586:  * instruction. In future this may be more sophisticated (ie will
nkeynes@586:  * call into generated code).
nkeynes@398:  */
nkeynes@586: void sh4_translate_run_recovery( xlat_recovery_record_t recovery )
nkeynes@398: {
nkeynes@586:     sh4r.slice_cycle += (recovery->sh4_icount * sh4_cpu_period);
nkeynes@586:     sh4r.pc += (recovery->sh4_icount<<1);
nkeynes@586: }
nkeynes@359: 
nkeynes@586: void sh4_translate_unwind_stack( gboolean abort_after, unwind_thunk_t thunk )
nkeynes@586: {
nkeynes@586:     void *pc = xlat_get_native_pc();
nkeynes@398: 
nkeynes@586:     assert( pc != NULL );
nkeynes@586:     void *code = xlat_get_code( sh4r.pc );
nkeynes@586:     xlat_recovery_record_t recover = xlat_get_recovery(code, pc, TRUE);
nkeynes@586:     if( recover != NULL ) {
nkeynes@586: 	// Can be null if there is no recovery necessary
nkeynes@586: 	sh4_translate_run_recovery(recover);
nkeynes@586:     }
nkeynes@586:     if( thunk != NULL ) {
nkeynes@586: 	thunk();
nkeynes@586:     }
nkeynes@586:     // finally longjmp back into sh4_xlat_run_slice
nkeynes@586:     xlat_running = FALSE;
nkeynes@586:     longjmp(xlat_jmp_buf, XLAT_EXIT_CONTINUE);
nkeynes@586: } 
nkeynes@398: 
nkeynes@586: void sh4_translate_exit( int exit_code )
nkeynes@586: {
nkeynes@586:     void *pc = xlat_get_native_pc();
nkeynes@586:     if( pc != NULL ) {
nkeynes@586: 	// could be null if we're not actually running inside the translator
nkeynes@586: 	void *code = xlat_get_code( sh4r.pc );
nkeynes@586: 	xlat_recovery_record_t recover = xlat_get_recovery(code, pc, TRUE);
nkeynes@586: 	if( recover != NULL ) {
nkeynes@586: 	    // Can be null if there is no recovery necessary
nkeynes@586: 	    sh4_translate_run_recovery(recover);
nkeynes@586: 	}
nkeynes@398:     }
nkeynes@586:     // finally longjmp back into sh4_xlat_run_slice
nkeynes@586:     xlat_running = FALSE;
nkeynes@586:     longjmp(xlat_jmp_buf, exit_code);
nkeynes@586: }
nkeynes@398: 
nkeynes@591: void sh4_translate_breakpoint_hit(uint32_t pc)
nkeynes@591: {
nkeynes@591:     if( sh4_starting && sh4r.slice_cycle == 0 && pc == sh4r.pc ) {
nkeynes@591: 	return;
nkeynes@591:     }
nkeynes@591:     sh4_translate_exit( XLAT_EXIT_BREAKPOINT );
nkeynes@591: }
nkeynes@591: 
nkeynes@586: /**
nkeynes@586:  * Exit the current block at the end of the current instruction, flush the
nkeynes@586:  * translation cache (completely) and return control to sh4_xlat_run_slice.
nkeynes@586:  *
nkeynes@586:  * As a special case, if the current instruction is actually the last 
nkeynes@586:  * instruction in the block (ie it's in a delay slot), this function 
nkeynes@586:  * returns to allow normal completion of the translation block. Otherwise
nkeynes@586:  * this function never returns.
nkeynes@586:  *
nkeynes@586:  * Must only be invoked (indirectly) from within translated code.
nkeynes@586:  */
nkeynes@586: void sh4_translate_flush_cache()
nkeynes@586: {
nkeynes@586:     void *pc = xlat_get_native_pc();
nkeynes@586:     assert( pc != NULL );
nkeynes@586: 
nkeynes@586:     void *code = xlat_get_code( sh4r.pc );
nkeynes@586:     xlat_recovery_record_t recover = xlat_get_recovery(code, pc, TRUE);
nkeynes@586:     if( recover != NULL ) {
nkeynes@586: 	// Can be null if there is no recovery necessary
nkeynes@586: 	sh4_translate_run_recovery(recover);
nkeynes@586: 	xlat_flush_cache();
nkeynes@586: 	xlat_running = FALSE;
nkeynes@586: 	longjmp(xlat_jmp_buf, XLAT_EXIT_CONTINUE);
nkeynes@586:     } else {
nkeynes@586: 	xlat_flush_cache();
nkeynes@586: 	return;
nkeynes@586:     }
nkeynes@398: }
nkeynes@586: 
nkeynes@586: void *xlat_get_code_by_vma( sh4vma_t vma )
nkeynes@586: {
nkeynes@586:     void *result = NULL;
nkeynes@586: 
nkeynes@588:     if( IS_IN_ICACHE(vma) ) {
nkeynes@586: 	result = xlat_get_code( GET_ICACHE_PHYS(vma) );
nkeynes@586:     }
nkeynes@586: 
nkeynes@588:     if( vma > 0xFFFFFF00 ) {
nkeynes@588: 	// lxdream hook
nkeynes@588: 	return NULL;
nkeynes@588:     }
nkeynes@588: 
nkeynes@588:     if( !mmu_update_icache(vma) ) {
nkeynes@588: 	// fault - off to the fault handler
nkeynes@588: 	if( !mmu_update_icache(sh4r.pc) ) {
nkeynes@588: 	    // double fault - halt
nkeynes@588: 	    ERROR( "Double fault - halting" );
nkeynes@588: 	    dreamcast_stop();
nkeynes@588: 	    return NULL;
nkeynes@588: 	}
nkeynes@588:     }
nkeynes@588: 
nkeynes@588:     assert( IS_IN_ICACHE(sh4r.pc) );
nkeynes@588:     result = xlat_get_code( GET_ICACHE_PHYS(sh4r.pc) );
nkeynes@586:     return result;
nkeynes@586: }
nkeynes@586: