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lxdream.org :: lxdream/src/sh4/sh4trans.c
lxdream 0.9.1
released Jun 29
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filename src/sh4/sh4trans.c
changeset 430:467519b050f4
prev417:bd927df302a9
next527:14c9489f647e
author nkeynes
date Mon Oct 08 12:09:06 2007 +0000 (14 years ago)
permissions -rw-r--r--
last change Fix compilation warnings
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     1 /**
     2  * $Id: sh4trans.c,v 1.8 2007-10-08 12:06:01 nkeynes Exp $
     3  * 
     4  * SH4 translation core module. This part handles the non-target-specific
     5  * section of the translation.
     6  *
     7  * Copyright (c) 2005 Nathan Keynes.
     8  *
     9  * This program is free software; you can redistribute it and/or modify
    10  * it under the terms of the GNU General Public License as published by
    11  * the Free Software Foundation; either version 2 of the License, or
    12  * (at your option) any later version.
    13  *
    14  * This program is distributed in the hope that it will be useful,
    15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    17  * GNU General Public License for more details.
    18  */
    19 #include <assert.h>
    20 #include "eventq.h"
    21 #include "syscall.h"
    22 #include "sh4/sh4core.h"
    23 #include "sh4/sh4trans.h"
    24 #include "sh4/xltcache.h"
    26 /**
    27  * Execute a timeslice using translated code only (ie translate/execute loop)
    28  * Note this version does not support breakpoints
    29  */
    30 uint32_t sh4_xlat_run_slice( uint32_t nanosecs ) 
    31 {
    32     sh4r.slice_cycle = 0;
    34     if( sh4r.sh4_state != SH4_STATE_RUNNING ) {
    35 	if( sh4r.event_pending < nanosecs ) {
    36 	    sh4r.sh4_state = SH4_STATE_RUNNING;
    37 	    sh4r.slice_cycle = sh4r.event_pending;
    38 	}
    39     }
    41     void * (*code)() = NULL;
    42     while( sh4r.slice_cycle < nanosecs ) {
    43 	if( sh4r.event_pending <= sh4r.slice_cycle ) {
    44 	    if( sh4r.event_types & PENDING_EVENT ) {
    45 		event_execute();
    46 	    }
    47 	    /* Eventq execute may (quite likely) deliver an immediate IRQ */
    48 	    if( sh4r.event_types & PENDING_IRQ ) {
    49 		sh4_accept_interrupt();
    50 		code = NULL;
    51 	    }
    52 	}
    54 	if( code == NULL ) {
    55 	    if( sh4r.pc > 0xFFFFFF00 ) {
    56 		syscall_invoke( sh4r.pc );
    57 		sh4r.in_delay_slot = 0;
    58 		sh4r.pc = sh4r.pr;
    59 	    }
    61 	    code = xlat_get_code(sh4r.pc);
    62 	    if( code == NULL ) {
    63 		code = sh4_translate_basic_block( sh4r.pc );
    64 	    }
    65 	}
    66 	code = code();
    67     }
    69     if( sh4r.sh4_state != SH4_STATE_STANDBY ) {
    70 	TMU_run_slice( nanosecs );
    71 	SCIF_run_slice( nanosecs );
    72     }
    73     return nanosecs;
    74 }
    76 uint8_t *xlat_output;
    78 /**
    79  * Translate a linear basic block, ie all instructions from the start address
    80  * (inclusive) until the next branch/jump instruction or the end of the page
    81  * is reached.
    82  * @return the address of the translated block
    83  * eg due to lack of buffer space.
    84  */
    85 void * sh4_translate_basic_block( sh4addr_t start )
    86 {
    87     sh4addr_t pc = start;
    88     sh4addr_t lastpc = (pc&0xFFFFF000)+0x1000;
    89     int done;
    90     xlat_cache_block_t block = xlat_start_block( start );
    91     xlat_output = (uint8_t *)block->code;
    92     uint8_t *eob = xlat_output + block->size;
    93     sh4_translate_begin_block(pc);
    95     do {
    96 	if( eob - xlat_output < MAX_INSTRUCTION_SIZE ) {
    97 	    uint8_t *oldstart = block->code;
    98 	    block = xlat_extend_block( xlat_output - oldstart + MAX_INSTRUCTION_SIZE );
    99 	    xlat_output = block->code + (xlat_output - oldstart);
   100 	    eob = block->code + block->size;
   101 	}
   102 	done = sh4_x86_translate_instruction( pc ); 
   103 	assert( xlat_output <= eob );
   104 	pc += 2;
   105 	if ( pc >= lastpc ) {
   106 	    done = 2;
   107 	}
   108     } while( !done );
   109     pc += (done - 2);
   110     if( eob - xlat_output < EPILOGUE_SIZE ) {
   111 	uint8_t *oldstart = block->code;
   112 	block = xlat_extend_block( xlat_output - oldstart + EPILOGUE_SIZE );
   113 	xlat_output = block->code + (xlat_output - oldstart);
   114     }	
   115     sh4_translate_end_block(pc);
   116     xlat_commit_block( xlat_output - block->code, pc-start );
   117     return block->code;
   118 }
   120 /**
   121  * Translate a linear basic block to a temporary buffer, execute it, and return
   122  * the result of the execution. The translation is discarded.
   123  */
   124 void *sh4_translate_and_run( sh4addr_t start )
   125 {
   126     unsigned char buf[65536];
   128     sh4addr_t pc = start;
   129     int done;
   130     xlat_output = buf;
   131     uint8_t *eob = xlat_output + sizeof(buf);
   133     sh4_translate_begin_block(pc);
   135     while( (done = sh4_x86_translate_instruction( pc )) == 0 ) {
   136 	assert( (eob - xlat_output) >= MAX_INSTRUCTION_SIZE );
   137 	pc += 2;
   138     }
   139     pc+=2;
   140     sh4_translate_end_block(pc);
   142     void * (*code)() = (void *)buf;
   143     return code();
   144 }
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