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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 707:fb7c8fe2f61c
prev675:b97020f9af1c
next733:633ee022f52e
author nkeynes
date Wed Jun 25 10:04:14 2008 +0000 (11 years ago)
permissions -rw-r--r--
last change Increase maximum instruction size - was exceeded in some corner cases
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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. Current worst case seems
    24  * to be a BF/S followed by one of the long FMOVs.
    25  */
    26 #define MAX_INSTRUCTION_SIZE 384
    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  * Translation flag - exit the current block and continue after the next IRQ.
    61  */
    62 #define XLAT_EXIT_SLEEP 5
    64 /**
    65  */
    66 uint32_t sh4_xlat_run_slice( uint32_t nanosecs );
    68 /**
    69  * Return true if translated code is currently running
    70  */
    71 gboolean sh4_xlat_is_running();
    73 /**
    74  * Initialize the translation engine (if required). Note xlat cache
    75  * must already be initialized.
    76  */
    77 void sh4_xlat_init();
    79 /**
    80  * Translate the specified block of code starting from the specified start
    81  * address until the first branch/jump instruction.
    82  */
    83 void *sh4_translate_basic_block( sh4addr_t start );
    85 /**
    86  * Add a recovery record for the current code generation position, with the
    87  * specified instruction count
    88  */
    89 void sh4_translate_add_recovery( uint32_t icount );
    91 extern uint8_t *xlat_output;
    92 extern struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
    93 extern xlat_cache_block_t xlat_current_block;
    94 extern uint32_t xlat_recovery_posn;
    96 /******************************************************************************
    97  * Code generation - these methods must be provided by the
    98  * actual code gen (eg sh4x86.c) 
    99  ******************************************************************************/
   101 #define TARGET_X86 1
   103 void sh4_translate_init( void );
   104 void sh4_translate_begin_block( sh4addr_t pc );
   105 uint32_t sh4_translate_instruction( sh4addr_t pc );
   106 void sh4_translate_end_block( sh4addr_t pc );
   107 uint32_t sh4_translate_end_block_size();
   108 void sh4_translate_emit_breakpoint( sh4vma_t pc );
   110 typedef void (*unwind_thunk_t)(void);
   112 /**
   113  * From within the translator, (typically called from MMU exception handling routines)
   114  * immediately exit the current translation block (performing cleanup as necessary) and
   115  * return to sh4_xlat_run_slice(). Effectively a fast longjmp w/ xlat recovery.
   116  *
   117  * Note: The correct working of this method depends on the translator anticipating the
   118  * exception and generating the appropriate recovery block(s) - currently this means 
   119  * that it should ONLY be called from within the context of a memory read or write.
   120  *
   121  * @param is_completion If TRUE, exit after completing the current instruction (effectively),
   122  *   otherwise abort the current instruction with no effect. 
   123  * @param thunk A function to execute after perform xlat recovery, but before returning
   124  * to run_slice. If NULL, control returns directly.
   125  * @return This method never returns. 
   126  */
   127 void sh4_translate_unwind_stack( gboolean is_completion, unwind_thunk_t thunk );
   129 /**
   130  * From within the translator, immediately exit the current translation block with
   131  * the specified exit code (one of the XLAT_EXIT_* values).
   132  */
   133 void sh4_translate_exit( int exit_code );
   135 /**
   136  * From within the translator, exit the current block at the end of the 
   137  * current instruction, flush the translation cache (completely) and return
   138  * control to sh4_xlat_run_slice.
   139  */
   140 void sh4_translate_flush_cache( void );
   142 /**
   143  * Support function called from the translator when a breakpoint is hit.
   144  * Either returns immediately (to skip the breakpoint), or aborts the current
   145  * cycle and never returns.
   146  */
   147 void sh4_translate_breakpoint_hit( sh4vma_t pc );
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