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lxdream.org :: lxdream/src/sh4/sh4trans.h
lxdream 0.9.1
released Jun 29
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filename src/sh4/sh4trans.h
changeset 586:2a3ba82cf243
prev527:14c9489f647e
next591:7b9612fd2395
author nkeynes
date Tue Jan 15 20:50:23 2008 +0000 (11 years ago)
permissions -rw-r--r--
last change Merged lxdream-mmu r570:596 to trunk
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     1 /**
     2  * $Id$
     3  * 
     4  * SH4->x86 translation module
     5  *
     6  * Copyright (c) 2005 Nathan Keynes.
     7  *
     8  * This program is free software; you can redistribute it and/or modify
     9  * it under the terms of the GNU General Public License as published by
    10  * the Free Software Foundation; either version 2 of the License, or
    11  * (at your option) any later version.
    12  *
    13  * This program is distributed in the hope that it will be useful,
    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    16  * GNU General Public License for more details.
    17  */
    19 #include "sh4/xltcache.h"
    20 #include "dream.h"
    21 #include "mem.h"
    23 /** Maximum size of a translated instruction, in bytes. This includes potentially
    24  * writing the entire epilogue
    25  */
    26 #define MAX_INSTRUCTION_SIZE 256
    27 /** Maximum size of the translation epilogue (current real size is 116 bytes, so
    28  * allows a little room
    29  */
    30 #define EPILOGUE_SIZE 128
    32 /** Maximum number of recovery records for a translated block (2048 based on
    33  * 1 record per SH4 instruction in a 4K page).
    34  */
    35 #define MAX_RECOVERY_SIZE 2048
    37 /**
    38  * Translation flag - exit the current block but continue (eg exception handling)
    39  */
    40 #define XLAT_EXIT_CONTINUE 1
    42 /**
    43  * Translation flag - exit the current block and halt immediately (eg fatal error)
    44  */
    45 #define XLAT_EXIT_HALT 2
    47 /**
    48  * Translation flag - exit the current block and halt immediately for a system
    49  * breakpoint.
    50  */
    51 #define XLAT_EXIT_BREAKPOINT 3
    53 /**
    54  * Translation flag - exit the current block and continue after performing a full
    55  * system reset (dreamcast_reset())
    56  */
    57 #define XLAT_EXIT_SYSRESET 4
    59 /**
    60  */
    61 uint32_t sh4_xlat_run_slice( uint32_t nanosecs );
    63 /**
    64  * Return true if translated code is currently running
    65  */
    66 gboolean sh4_xlat_is_running();
    68 /**
    69  * Translate the specified block of code starting from the specified start
    70  * address until the first branch/jump instruction.
    71  */
    72 void *sh4_translate_basic_block( sh4addr_t start );
    75 extern uint8_t *xlat_output;
    76 extern struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
    77 extern uint32_t xlat_recovery_posn;
    79 /******************************************************************************
    80  * Code generation - these methods must be provided by the
    81  * actual code gen (eg sh4x86.c) 
    82  ******************************************************************************/
    84 #define TARGET_X86 1
    85 #define TARGET_X86_64 2
    87 void sh4_translate_begin_block( sh4addr_t pc );
    88 uint32_t sh4_translate_instruction( sh4addr_t pc );
    89 void sh4_translate_end_block( sh4addr_t pc );
    91 typedef void (*unwind_thunk_t)(void);
    93 /**
    94  * From within the translator, (typically called from MMU exception handling routines)
    95  * immediately exit the current translation block (performing cleanup as necessary) and
    96  * return to sh4_xlat_run_slice(). Effectively a fast longjmp w/ xlat recovery.
    97  *
    98  * Note: The correct working of this method depends on the translator anticipating the
    99  * exception and generating the appropriate recovery block(s) - currently this means 
   100  * that it should ONLY be called from within the context of a memory read or write.
   101  *
   102  * @param is_completion If TRUE, exit after completing the current instruction (effectively),
   103  *   otherwise abort the current instruction with no effect. 
   104  * @param thunk A function to execute after perform xlat recovery, but before returning
   105  * to run_slice. If NULL, control returns directly.
   106  * @return This method never returns. 
   107  */
   108 void sh4_translate_unwind_stack( gboolean is_completion, unwind_thunk_t thunk );
   110 /**
   111  * From within the translator, immediately exit the current translation block with
   112  * the specified exit code (one of the XLAT_EXIT_* values).
   113  */
   114 void sh4_translate_exit( int exit_code );
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