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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 593:6c710c7c6835
prev591:7b9612fd2395
next604:1024c3a9cb88
author nkeynes
date Thu Jan 17 21:26:58 2008 +0000 (11 years ago)
permissions -rw-r--r--
last change Fix block overruns from long epilogues
file annotate diff log raw
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/**
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 * $Id$
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 * 
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 * SH4->x86 translation module
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 *
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 * Copyright (c) 2005 Nathan Keynes.
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 */
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#include "sh4/xltcache.h"
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#include "dream.h"
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#include "mem.h"
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/** Maximum size of a translated instruction, in bytes. This includes potentially
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 * writing the entire epilogue
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 */
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#define MAX_INSTRUCTION_SIZE 256
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/** Maximum size of the translation epilogue (current real size is 116 bytes, so
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 * allows a little room
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 */
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#define EPILOGUE_SIZE 128
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/** Maximum number of recovery records for a translated block (2048 based on
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 * 1 record per SH4 instruction in a 4K page).
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 */
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#define MAX_RECOVERY_SIZE 2048
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/**
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 * Translation flag - exit the current block but continue (eg exception handling)
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 */
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#define XLAT_EXIT_CONTINUE 1
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/**
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 * Translation flag - exit the current block and halt immediately (eg fatal error)
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 */
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#define XLAT_EXIT_HALT 2
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/**
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 * Translation flag - exit the current block and halt immediately for a system
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 * breakpoint.
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 */
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#define XLAT_EXIT_BREAKPOINT 3
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/**
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 * Translation flag - exit the current block and continue after performing a full
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 * system reset (dreamcast_reset())
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 */
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#define XLAT_EXIT_SYSRESET 4
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/**
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 */
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uint32_t sh4_xlat_run_slice( uint32_t nanosecs );
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/**
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 * Return true if translated code is currently running
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 */
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gboolean sh4_xlat_is_running();
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/**
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 * Translate the specified block of code starting from the specified start
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 * address until the first branch/jump instruction.
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 */
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void *sh4_translate_basic_block( sh4addr_t start );
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extern uint8_t *xlat_output;
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extern struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
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extern uint32_t xlat_recovery_posn;
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/******************************************************************************
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 * Code generation - these methods must be provided by the
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 * actual code gen (eg sh4x86.c) 
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 ******************************************************************************/
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#define TARGET_X86 1
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#define TARGET_X86_64 2
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void sh4_translate_begin_block( sh4addr_t pc );
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uint32_t sh4_translate_instruction( sh4addr_t pc );
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void sh4_translate_end_block( sh4addr_t pc );
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uint32_t sh4_translate_end_block_size();
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typedef void (*unwind_thunk_t)(void);
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/**
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 * From within the translator, (typically called from MMU exception handling routines)
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 * immediately exit the current translation block (performing cleanup as necessary) and
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 * return to sh4_xlat_run_slice(). Effectively a fast longjmp w/ xlat recovery.
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 *
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 * Note: The correct working of this method depends on the translator anticipating the
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 * exception and generating the appropriate recovery block(s) - currently this means 
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 * that it should ONLY be called from within the context of a memory read or write.
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 *
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 * @param is_completion If TRUE, exit after completing the current instruction (effectively),
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 *   otherwise abort the current instruction with no effect. 
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 * @param thunk A function to execute after perform xlat recovery, but before returning
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 * to run_slice. If NULL, control returns directly.
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 * @return This method never returns. 
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 */
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void sh4_translate_unwind_stack( gboolean is_completion, unwind_thunk_t thunk );
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/**
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 * From within the translator, immediately exit the current translation block with
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 * the specified exit code (one of the XLAT_EXIT_* values).
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 */
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void sh4_translate_exit( int exit_code );
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/**
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 * Support function called from the translator when a breakpoint is hit.
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 * Either returns immediately (to skip the breakpoint), or aborts the current
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 * cycle and never returns.
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 */
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void sh4_translate_breakpoint_hit( sh4vma_t pc );
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