nkeynes@359: /**
nkeynes@561:  * $Id$
nkeynes@359:  * 
nkeynes@359:  * SH4->x86 translation module
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@359: 
nkeynes@571: #include "sh4/xltcache.h"
nkeynes@359: #include "dream.h"
nkeynes@359: #include "mem.h"
nkeynes@359: 
nkeynes@359: /** Maximum size of a translated instruction, in bytes. This includes potentially
nkeynes@359:  * writing the entire epilogue
nkeynes@359:  */
nkeynes@389: #define MAX_INSTRUCTION_SIZE 256
nkeynes@410: /** Maximum size of the translation epilogue (current real size is 116 bytes, so
nkeynes@410:  * allows a little room
nkeynes@410:  */
nkeynes@410: #define EPILOGUE_SIZE 128
nkeynes@571: 
nkeynes@571: /** Maximum number of recovery records for a translated block (2048 based on
nkeynes@571:  * 1 record per SH4 instruction in a 4K page).
nkeynes@571:  */
nkeynes@571: #define MAX_RECOVERY_SIZE 2048
nkeynes@571: 
nkeynes@359: /**
nkeynes@359:  */
nkeynes@359: uint32_t sh4_xlat_run_slice( uint32_t nanosecs );
nkeynes@359: 
nkeynes@359: /**
nkeynes@359:  * Translate the specified block of code starting from the specified start
nkeynes@359:  * address until the first branch/jump instruction.
nkeynes@359:  */
nkeynes@359: void *sh4_translate_basic_block( sh4addr_t start );
nkeynes@359: 
nkeynes@571: 
nkeynes@359: extern uint8_t *xlat_output;
nkeynes@571: extern struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
nkeynes@571: extern uint32_t xlat_recovery_posn;
nkeynes@359: 
nkeynes@526: /******************************************************************************
nkeynes@526:  * Code generation - these methods must be provided by the
nkeynes@526:  * actual code gen (eg sh4x86.c) 
nkeynes@526:  ******************************************************************************/
nkeynes@359: 
nkeynes@527: #define TARGET_X86 1
nkeynes@527: #define TARGET_X86_64 2
nkeynes@527: 
nkeynes@408: void sh4_translate_begin_block( sh4addr_t pc );
nkeynes@526: uint32_t sh4_translate_instruction( sh4addr_t pc );
nkeynes@359: void sh4_translate_end_block( sh4addr_t pc );
nkeynes@571: 
nkeynes@571: typedef void (*unwind_thunk_t)(void);
nkeynes@571: 
nkeynes@571: /**
nkeynes@571:  * From within the translator, (typically called from MMU exception handling routines)
nkeynes@571:  * immediately exit the current translation block (performing cleanup as necessary) and
nkeynes@571:  * return to sh4_xlat_run_slice(). Effectively a fast longjmp w/ xlat recovery.
nkeynes@571:  *
nkeynes@571:  * Note: The correct working of this method depends on the translator anticipating the
nkeynes@571:  * exception and generating the appropriate recovery block(s) - currently this means 
nkeynes@571:  * that it should ONLY be called from within the context of a memory read or write.
nkeynes@571:  *
nkeynes@571:  * @param is_completion If TRUE, exit after completing the current instruction (effectively),
nkeynes@571:  *   otherwise abort the current instruction with no effect. 
nkeynes@571:  * @param thunk A function to execute after perform xlat recovery, but before returning
nkeynes@571:  * to run_slice. If NULL, control returns directly.
nkeynes@571:  * @return This method never returns. 
nkeynes@571:  */
nkeynes@571: void sh4_translate_unwind_stack( gboolean is_completion, unwind_thunk_t thunk );