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@430: #include "eventq.h"
nkeynes@430: #include "syscall.h"
nkeynes@586: #include "clock.h"
nkeynes@669: #include "dreamcast.h"
nkeynes@430: #include "sh4/sh4core.h"
nkeynes@430: #include "sh4/sh4trans.h"
nkeynes@430: #include "sh4/xltcache.h"
nkeynes@359: 
nkeynes@586: 
nkeynes@359: /**
nkeynes@359:  * Execute a timeslice using translated code only (ie translate/execute loop)
nkeynes@359:  */
nkeynes@740: uint32_t sh4_translate_run_slice( uint32_t nanosecs ) 
nkeynes@359: {
nkeynes@408:     void * (*code)() = NULL;
nkeynes@368:     while( sh4r.slice_cycle < nanosecs ) {
nkeynes@736:         if( sh4r.event_pending <= sh4r.slice_cycle ) {
nkeynes@736:             if( sh4r.event_types & PENDING_EVENT ) {
nkeynes@736:                 event_execute();
nkeynes@736:             }
nkeynes@736:             /* Eventq execute may (quite likely) deliver an immediate IRQ */
nkeynes@736:             if( sh4r.event_types & PENDING_IRQ ) {
nkeynes@736:                 sh4_accept_interrupt();
nkeynes@736:                 code = NULL;
nkeynes@736:             }
nkeynes@736:         }
nkeynes@359: 
nkeynes@736:         if( code == NULL ) {
nkeynes@736:             if( sh4r.pc > 0xFFFFFF00 ) {
nkeynes@736:                 syscall_invoke( sh4r.pc );
nkeynes@736:                 sh4r.in_delay_slot = 0;
nkeynes@736:                 sh4r.pc = sh4r.pr;
nkeynes@736:             }
nkeynes@736: 
nkeynes@736:             code = xlat_get_code_by_vma( sh4r.pc );
nkeynes@736:             if( code == NULL ) {
nkeynes@736:                 code = sh4_translate_basic_block( sh4r.pc );
nkeynes@736:             }
nkeynes@736:         }
nkeynes@736:         code = code();
nkeynes@359:     }
nkeynes@359:     return nanosecs;
nkeynes@359: }
nkeynes@359: 
nkeynes@359: uint8_t *xlat_output;
nkeynes@596: xlat_cache_block_t xlat_current_block;
nkeynes@586: struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
nkeynes@586: uint32_t xlat_recovery_posn;
nkeynes@359: 
nkeynes@596: void sh4_translate_add_recovery( uint32_t icount )
nkeynes@596: {
nkeynes@596:     xlat_recovery[xlat_recovery_posn].xlat_offset = 
nkeynes@736:         ((uintptr_t)xlat_output) - ((uintptr_t)xlat_current_block->code);
nkeynes@596:     xlat_recovery[xlat_recovery_posn].sh4_icount = icount;
nkeynes@596:     xlat_recovery_posn++;
nkeynes@596: }
nkeynes@596: 
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@596:     xlat_current_block = xlat_start_block( start );
nkeynes@596:     xlat_output = (uint8_t *)xlat_current_block->code;
nkeynes@586:     xlat_recovery_posn = 0;
nkeynes@596:     uint8_t *eob = xlat_output + xlat_current_block->size;
nkeynes@588: 
nkeynes@588:     if( GET_ICACHE_END() < lastpc ) {
nkeynes@711:         lastpc = GET_ICACHE_END();
nkeynes@588:     }
nkeynes@588: 
nkeynes@408:     sh4_translate_begin_block(pc);
nkeynes@359: 
nkeynes@408:     do {
nkeynes@711:         /* check for breakpoints at this pc */
nkeynes@711:         for( i=0; i<sh4_breakpoint_count; i++ ) {
nkeynes@711:             if( sh4_breakpoints[i].address == pc ) {
nkeynes@711:                 sh4_translate_emit_breakpoint(pc);
nkeynes@711:                 break;
nkeynes@711:             }
nkeynes@711:         }
nkeynes@711:         if( eob - xlat_output < MAX_INSTRUCTION_SIZE ) {
nkeynes@711:             uint8_t *oldstart = xlat_current_block->code;
nkeynes@711:             xlat_current_block = xlat_extend_block( xlat_output - oldstart + MAX_INSTRUCTION_SIZE );
nkeynes@711:             xlat_output = xlat_current_block->code + (xlat_output - oldstart);
nkeynes@711:             eob = xlat_current_block->code + xlat_current_block->size;
nkeynes@711:         }
nkeynes@711:         done = sh4_translate_instruction( pc ); 
nkeynes@711:         assert( xlat_output <= eob );
nkeynes@711:         pc += 2;
nkeynes@711:         if ( pc >= lastpc ) {
nkeynes@711:             done = 2;
nkeynes@711:         }
nkeynes@408:     } while( !done );
nkeynes@408:     pc += (done - 2);
nkeynes@617: 
nkeynes@617:     // Add end-of-block recovery for post-instruction checks
nkeynes@617:     sh4_translate_add_recovery( (pc - start)>>1 ); 
nkeynes@617: 
nkeynes@593:     int epilogue_size = sh4_translate_end_block_size();
nkeynes@593:     uint32_t recovery_size = sizeof(struct xlat_recovery_record)*xlat_recovery_posn;
nkeynes@711:     uint32_t finalsize = (xlat_output - xlat_current_block->code) + epilogue_size + recovery_size;
nkeynes@711:     if( xlat_current_block->size < finalsize ) {
nkeynes@711:         uint8_t *oldstart = xlat_current_block->code;
nkeynes@711:         xlat_current_block = xlat_extend_block( finalsize );
nkeynes@711:         xlat_output = xlat_current_block->code + (xlat_output - oldstart);
nkeynes@410:     }	
nkeynes@368:     sh4_translate_end_block(pc);
nkeynes@711:     assert( xlat_output <= (xlat_current_block->code + xlat_current_block->size - recovery_size) );
nkeynes@736: 
nkeynes@586:     /* Write the recovery records onto the end of the code block */
nkeynes@586:     memcpy( xlat_output, xlat_recovery, recovery_size);
nkeynes@596:     xlat_current_block->recover_table_offset = xlat_output - (uint8_t *)xlat_current_block->code;
nkeynes@596:     xlat_current_block->recover_table_size = xlat_recovery_posn;
nkeynes@586:     xlat_commit_block( finalsize, pc-start );
nkeynes@596:     return xlat_current_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@740: void sh4_translate_exit_recover( )
nkeynes@586: {
nkeynes@586:     void *pc = xlat_get_native_pc();
nkeynes@586:     if( pc != NULL ) {
nkeynes@736:         // could be null if we're not actually running inside the translator
nkeynes@736:         void *code = xlat_get_code( sh4r.pc );
nkeynes@809:         xlat_recovery_record_t recover = xlat_get_post_recovery(code, pc, TRUE);
nkeynes@736:         if( recover != NULL ) {
nkeynes@736:             // Can be null if there is no recovery necessary
nkeynes@736:             sh4_translate_run_recovery(recover);
nkeynes@736:         }
nkeynes@398:     }
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@736:         return;
nkeynes@591:     }
nkeynes@740:     sh4_core_exit( CORE_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@740: gboolean 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@809:     xlat_recovery_record_t recover = xlat_get_post_recovery(code, pc, FALSE);
nkeynes@586:     if( recover != NULL ) {
nkeynes@736:         // Can be null if there is no recovery necessary
nkeynes@736:         sh4_translate_run_recovery(recover);
nkeynes@736:         xlat_flush_cache();
nkeynes@740:         return TRUE;
nkeynes@586:     } else {
nkeynes@736:         xlat_flush_cache();
nkeynes@740:         return FALSE;
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@736:         return xlat_get_code( GET_ICACHE_PHYS(vma) );
nkeynes@586:     }
nkeynes@586: 
nkeynes@588:     if( vma > 0xFFFFFF00 ) {
nkeynes@736:         // lxdream hook
nkeynes@736:         return NULL;
nkeynes@588:     }
nkeynes@588: 
nkeynes@588:     if( !mmu_update_icache(vma) ) {
nkeynes@736:         // fault - off to the fault handler
nkeynes@736:         if( !mmu_update_icache(sh4r.pc) ) {
nkeynes@736:             // double fault - halt
nkeynes@736:             ERROR( "Double fault - halting" );
nkeynes@740:             sh4_core_exit(CORE_EXIT_HALT);
nkeynes@736:             return NULL;
nkeynes@736:         }
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: