lxdream 0.9.1| filename | src/sh4/sh4trans.h |
| changeset | 926:68f3e0fe02f1 |
| prev | 905:4c17ebd9ef5e |
| next | 941:c67574ed4355 |
| author | nkeynes |
| date | Sun Dec 14 07:50:48 2008 +0000 (14 years ago) |
| permissions | -rw-r--r-- |
| last change | Setup a 'proper' stackframe in translated blocks. This doesn't affect performance noticeably, but does ensure that a) The stack is aligned correctly on OS X with no extra effort, and b) We can't mess up the stack and crash that way anymore. Replace all PUSH/POP instructions (outside of prologue/epilogue) with ESP-rel moves to stack local variables. Finally merge ia32mac and ia32abi together, since they're pretty much the same now anyway (and thereby simplifying maintenance a good deal) |
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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 #ifndef lxdream_sh4trans_H
20 #define lxdream_sh4trans_H 1
22 #include "sh4/xltcache.h"
23 #include "dream.h"
24 #include "mem.h"
26 #ifdef __cplusplus
27 extern "C" {
28 #endif
30 /** Maximum size of a translated instruction, in bytes. Current worst case seems
31 * to be a BF/S followed by one of the long FMOVs.
32 */
33 #define MAX_INSTRUCTION_SIZE 512
34 /** Maximum size of the translation epilogue (current real size is 116 bytes, so
35 * allows a little room
36 */
37 #define EPILOGUE_SIZE 136
39 /** Maximum number of recovery records for a translated block (2048 based on
40 * 1 record per SH4 instruction in a 4K page).
41 */
42 #define MAX_RECOVERY_SIZE 2049
44 /**
45 */
46 uint32_t sh4_xlat_run_slice( uint32_t nanosecs );
48 /**
49 * Return true if translated code is currently running
50 */
51 gboolean sh4_xlat_is_running();
53 /**
54 * Initialize the translation engine (if required). Note xlat cache
55 * must already be initialized.
56 */
57 void sh4_xlat_init();
59 /**
60 * Translate the specified block of code starting from the specified start
61 * address until the first branch/jump instruction.
62 */
63 void *sh4_translate_basic_block( sh4addr_t start );
65 /**
66 * Add a recovery record for the current code generation position, with the
67 * specified instruction count
68 */
69 void sh4_translate_add_recovery( uint32_t icount );
71 extern uint8_t *xlat_output;
72 extern struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
73 extern xlat_cache_block_t xlat_current_block;
74 extern uint32_t xlat_recovery_posn;
76 /******************************************************************************
77 * Code generation - these methods must be provided by the
78 * actual code gen (eg sh4x86.c)
79 ******************************************************************************/
81 #define TARGET_X86 1
83 void sh4_translate_init( void );
84 void sh4_translate_begin_block( sh4addr_t pc );
85 uint32_t sh4_translate_instruction( sh4addr_t pc );
86 void sh4_translate_end_block( sh4addr_t pc );
87 uint32_t sh4_translate_end_block_size();
88 void sh4_translate_emit_breakpoint( sh4vma_t pc );
90 typedef void (*unwind_thunk_t)(void);
92 /**
93 * From within the translator, (typically called from MMU exception handling routines)
94 * immediately exit the current translation block (performing cleanup as necessary) and
95 * return to sh4_xlat_run_slice(). Effectively a fast longjmp w/ xlat recovery.
96 *
97 * Note: The correct working of this method depends on the translator anticipating the
98 * exception and generating the appropriate recovery block(s) - currently this means
99 * that it should ONLY be called from within the context of a memory read or write.
100 *
101 * @param is_completion If TRUE, exit after completing the current instruction (effectively),
102 * otherwise abort the current instruction with no effect.
103 * @param thunk A function to execute after perform xlat recovery, but before returning
104 * to run_slice. If NULL, control returns directly.
105 * @return This method never returns.
106 */
107 void sh4_translate_unwind_stack( gboolean is_completion, unwind_thunk_t thunk );
109 /**
110 * Called when doing a break out of the translator - finalizes the system state up to
111 * the end of the current instruction.
112 */
113 void sh4_translate_exit_recover( );
115 /**
116 * From within the translator, exit the current block at the end of the
117 * current instruction, flush the translation cache (completely)
118 * @return TRUE to perform a vm-exit/continue after the flush
119 */
120 gboolean sh4_translate_flush_cache( void );
122 /**
123 * Support function called from the translator when a breakpoint is hit.
124 * Either returns immediately (to skip the breakpoint), or aborts the current
125 * cycle and never returns.
126 */
127 void FASTCALL sh4_translate_breakpoint_hit( sh4vma_t pc );
129 #ifdef __cplusplus
130 }
131 #endif
133 #endif /* !lxdream_sh4trans_H */
.