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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 408:af496b734734
prev398:16b0856ea511
next410:5f8413358e7f
author nkeynes
date Fri Sep 28 07:27:20 2007 +0000 (14 years ago)
permissions -rw-r--r--
last change Change block signature to return pointer to next block (if known)
Rewrite block-exit code
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     1 /**
     2  * $Id: sh4trans.c,v 1.5 2007-09-28 07:27:20 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 "sh4core.h"
    21 #include "sh4trans.h"
    22 #include "xltcache.h"
    24 /**
    25  * Execute a timeslice using translated code only (ie translate/execute loop)
    26  * Note this version does not support breakpoints
    27  */
    28 uint32_t sh4_xlat_run_slice( uint32_t nanosecs ) 
    29 {
    30     int i;
    31     sh4r.slice_cycle = 0;
    33     if( sh4r.sh4_state != SH4_STATE_RUNNING ) {
    34 	if( sh4r.event_pending < nanosecs ) {
    35 	    sh4r.sh4_state = SH4_STATE_RUNNING;
    36 	    sh4r.slice_cycle = sh4r.event_pending;
    37 	}
    38     }
    40     void * (*code)() = NULL;
    41     while( sh4r.slice_cycle < nanosecs ) {
    42 	if( sh4r.event_pending <= sh4r.slice_cycle ) {
    43 	    if( sh4r.event_types & PENDING_EVENT ) {
    44 		event_execute();
    45 	    }
    46 	    /* Eventq execute may (quite likely) deliver an immediate IRQ */
    47 	    if( sh4r.event_types & PENDING_IRQ ) {
    48 		sh4_accept_interrupt();
    49 		code = NULL;
    50 	    }
    51 	}
    53 	if( code ) { // fast path
    54 	    code = code();
    55 	} else {
    56 	    if( sh4r.pc > 0xFFFFFF00 ) {
    57 		syscall_invoke( sh4r.pc );
    58 		sh4r.in_delay_slot = 0;
    59 		sh4r.pc = sh4r.pr;
    60 	    }
    62 	    code = xlat_get_code(sh4r.pc);
    63 	    if( code == NULL ) {
    64 		code = sh4_translate_basic_block( sh4r.pc );
    65 	    }
    66 	    code = code();
    67 	}
    68     }
    70     if( sh4r.sh4_state != SH4_STATE_STANDBY ) {
    71 	TMU_run_slice( nanosecs );
    72 	SCIF_run_slice( nanosecs );
    73     }
    74     return nanosecs;
    75 }
    77 uint8_t *xlat_output;
    79 /**
    80  * Translate a linear basic block, ie all instructions from the start address
    81  * (inclusive) until the next branch/jump instruction or the end of the page
    82  * is reached.
    83  * @return the address of the translated block
    84  * eg due to lack of buffer space.
    85  */
    86 void * sh4_translate_basic_block( sh4addr_t start )
    87 {
    88     sh4addr_t pc = start;
    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();
    99 	    xlat_output = block->code + (xlat_output - oldstart);
   100 	    eob = block->code + block->size;
   101 	}
   102 	done = sh4_x86_translate_instruction( pc ); 
   103 	pc += 2;
   104     } while( !done );
   105     pc += (done - 2);
   106     sh4_translate_end_block(pc);
   107     xlat_commit_block( xlat_output - block->code, pc-start );
   108     return block->code;
   109 }
   111 /**
   112  * Translate a linear basic block to a temporary buffer, execute it, and return
   113  * the result of the execution. The translation is discarded.
   114  */
   115 void *sh4_translate_and_run( sh4addr_t start )
   116 {
   117     char buf[65536];
   119     uint32_t pc = start;
   120     int done;
   121     xlat_output = buf;
   122     uint8_t *eob = xlat_output + sizeof(buf);
   124     sh4_translate_begin_block(pc);
   126     while( (done = sh4_x86_translate_instruction( pc )) == 0 ) {
   127 	assert( (eob - xlat_output) >= MAX_INSTRUCTION_SIZE );
   128 	pc += 2;
   129     }
   130     pc+=2;
   131     sh4_translate_end_block(pc);
   133     void * (*code)() = (void *)buf;
   134     return code();
   135 }
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