lxdream 0.9.1| filename | src/xlat/xltcache.h |
| changeset | 1006:3a169c224c12 |
| prev | 991:60c7fab9c880 |
| author | nkeynes |
| date | Sun Apr 12 07:24:45 2009 +0000 (15 years ago) |
| branch | xlat-refactor |
| permissions | -rw-r--r-- |
| last change | Restructure operand types - rename to forms to avoid conflict for actual data types temporary operands are now a first class form remove explicit types for immediates - now implied by opcode Initial work on promote-source-reg pass |
| view | annotate | diff | log | raw |
1 /**
2 * $Id$
3 *
4 * Translation cache support (architecture independent)
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 "dream.h"
20 #include "mem.h"
22 #ifndef lxdream_xltcache_H
23 #define lxdream_xltcache_H 1
25 /**
26 * Exception table record - this is filled out by the codegen used by the codegen (to backpatch)
27 * and linker (for longjmp recover)
28 */;
29 typedef struct xlat_exception_record {
30 uint32_t xlat_pc_offset; // Native PC exception source (relative to start of code block)
31 uint32_t xlat_exc_offset; // Exception entry point (relative to start of code block)
32 } *xlat_exception_record_t;
34 typedef struct xlat_exception_table {
35 xlat_exception_record_t exc;
36 size_t next_record;
37 size_t table_size;
38 } *xlat_exception_table_t;
40 /**
41 * For now, recovery is purely a matter of mapping native pc => sh4 pc,
42 * and updating sh4r.pc & sh4r.slice_cycles accordingly. In future more
43 * detailed recovery may be required if the translator optimizes more
44 * agressively.
45 *
46 * The recovery table contains (at least) one entry per abortable instruction,
47 *
48 */
49 typedef struct xlat_recovery_record {
50 uint32_t xlat_offset; // native (translated) pc
51 uint32_t sh4_icount; // instruction number of the corresponding SH4 instruction
52 // (0 = first instruction, 1 = second instruction, ... )
53 } *xlat_recovery_record_t;
55 struct xlat_cache_block {
56 int active; /* 0 = deleted, 1 = normal. 2 = accessed (temp-space only) */
57 uint32_t size;
58 void **lut_entry; /* For deletion */
59 uint32_t xlat_sh4_mode; /* comparison with sh4r.xlat_sh4_mode */
60 uint32_t recover_table_offset; // Offset from code[0] of the recovery table;
61 uint32_t recover_table_size;
62 unsigned char code[0];
63 } __attribute__((packed));
65 typedef struct xlat_cache_block *xlat_cache_block_t;
67 #define XLAT_BLOCK_FOR_CODE(code) (((xlat_cache_block_t)code)-1)
69 #define XLAT_BLOCK_MODE(code) (XLAT_BLOCK_FOR_CODE(code)->xlat_sh4_mode)
71 /**
72 * Initialize the translation cache
73 */
74 void xlat_cache_init(void);
76 /**
77 * Returns the next block in the new cache list that can be written to by the
78 * translator.
79 */
80 xlat_cache_block_t xlat_start_block(sh4addr_t address);
82 /**
83 * Increases the current block size (only valid between calls to xlat_start_block()
84 * and xlat_commit_block()).
85 * @return the new block, which may be different from the old block.
86 */
87 xlat_cache_block_t xlat_extend_block( uint32_t newSize );
89 /**
90 * Commit the current translation block
91 * @param addr target address (for the lookup table)
92 * @param destsize final size of the translation in bytes.
93 * @param srcsize size of the original data that was translated in bytes
94 */
95 void xlat_commit_block( uint32_t destsize, uint32_t srcsize );
97 /**
98 * Dump the disassembly of the specified code block to a stream
99 * (primarily for debugging purposes)
100 * @param out The stream to write the output to
101 * @param code a translated block
102 */
103 void xlat_disasm_block( FILE *out, void *code );
106 /**
107 * Delete (deactivate) the specified block from the cache. Caller is responsible
108 * for ensuring that there really is a block there.
109 */
110 void xlat_delete_block( xlat_cache_block_t block );
112 /**
113 * Retrieve the entry point for the translated code corresponding to the given
114 * SH4 address, or NULL if there is no code for that address.
115 */
116 void * FASTCALL xlat_get_code( sh4addr_t address );
118 /**
119 * Retrieve the pre-instruction recovery record corresponding to the given
120 * native address, or NULL if there is no recovery code for the address.
121 * @param code The code block containing the recovery table.
122 * @param native_pc A pointer that must be within the currently executing
123 * return the first record before or equal to the given pc.
124 * translation block.
125 */
126 struct xlat_recovery_record *xlat_get_pre_recovery( void *code, void *native_pc );
129 /**
130 * Retrieve the entry point for the translated code corresponding to the given
131 * SH4 virtual address, or NULL if there is no code for the address.
132 * If the virtual address cannot be resolved, this method will raise a TLB miss
133 * exception, and return NULL.
134 */
135 void * FASTCALL xlat_get_code_by_vma( sh4vma_t address );
137 /**
138 * Retrieve the address of the lookup table entry corresponding to the
139 * given SH4 address.
140 */
141 void ** FASTCALL xlat_get_lut_entry( sh4addr_t address );
143 /**
144 * Retrieve the current host address of the running translated code block.
145 * @return the host PC, or null if there is no currently executing translated
146 * block (or the stack is corrupted)
147 * Note: the implementation of this method is host (and calling-convention) specific.
148 * @param block_start start of the block the PC should be in
149 * @param block_size size of the code block in bytes.
150 */
151 void *xlat_get_native_pc( void *block_start, uint32_t block_size );
153 /**
154 * Retrieve the size of the block starting at the specified pointer. If the
155 * pointer is not a valid code block, the return value is undefined.
156 */
157 uint32_t FASTCALL xlat_get_block_size( void *ptr );
159 /**
160 * Retrieve the size of the code in the block starting at the specified
161 * pointer. Effectively this is xlat_get_block_size() minus the size of
162 * the recovery table. If the pointer is not a valid code block, the
163 * return value is undefined.
164 */
165 uint32_t FASTCALL xlat_get_code_size( void *ptr );
167 /**
168 * Flush the code cache for the page containing the given address
169 */
170 void FASTCALL xlat_flush_page( sh4addr_t address );
172 void FASTCALL xlat_invalidate_word( sh4addr_t address );
173 void FASTCALL xlat_invalidate_long( sh4addr_t address );
176 /**
177 * Invalidate the code cache for a memory region
178 */
179 void FASTCALL xlat_invalidate_block( sh4addr_t address, size_t bytes );
181 /**
182 * Flush the entire code cache. This isn't as cheap as one might like
183 */
184 void xlat_flush_cache();
186 /**
187 * Check the internal integrity of the cache
188 */
189 void xlat_check_integrity();
191 #endif /* lxdream_xltcache_H */
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