filename | src/sh4/sh4trans.c |
changeset | 1112:4cac5e474d4c |
prev | 1103:de9ad2c0cf56 |
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author | nkeynes |
date | Fri Sep 10 08:50:55 2010 +1000 (13 years ago) |
permissions | -rw-r--r-- |
last change | Add missing sh4_translate_breakpoint_hit to the symbol table Change asm() to __asm__() as it's more likely to work |
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1 /**
2 * $Id$
3 *
4 * SH4 translation core module. This part handles the non-target-specific
5 * section of the translation.
6 *
7 * Copyright (c) 2005 Nathan Keynes.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
19 #include <assert.h>
20 #include "eventq.h"
21 #include "syscall.h"
22 #include "clock.h"
23 #include "dreamcast.h"
24 #include "sh4/sh4core.h"
25 #include "sh4/sh4trans.h"
26 #include "sh4/sh4mmio.h"
27 #include "sh4/mmu.h"
28 #include "xlat/xltcache.h"
30 /**
31 * Execute a timeslice using translated code only (ie translate/execute loop)
32 */
33 uint32_t sh4_translate_run_slice( uint32_t nanosecs )
34 {
35 void * (*code)() = NULL;
36 event_schedule( EVENT_ENDTIMESLICE, nanosecs );
37 for(;;) {
38 if( sh4r.event_pending <= sh4r.slice_cycle ) {
39 if( sh4r.event_types & PENDING_EVENT ) {
40 event_execute();
41 }
42 /* Eventq execute may (quite likely) deliver an immediate IRQ */
43 if( sh4r.event_types & PENDING_IRQ ) {
44 sh4_accept_interrupt();
45 code = NULL;
46 }
47 if( sh4r.slice_cycle >= nanosecs )
48 return nanosecs;
49 }
51 if( IS_SYSCALL(sh4r.pc) ) {
52 uint32_t pc = sh4r.pc;
53 sh4r.pc = sh4r.pr;
54 sh4r.in_delay_slot = 0;
55 syscall_invoke( pc );
56 }
58 code = xlat_get_code_by_vma( sh4r.pc );
59 if( code == NULL || sh4r.xlat_sh4_mode != XLAT_BLOCK_MODE(code) ) {
60 code = sh4_translate_basic_block( sh4r.pc );
61 }
62 code();
63 }
64 }
66 uint8_t *xlat_output;
67 xlat_cache_block_t xlat_current_block;
68 struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
69 uint32_t xlat_recovery_posn;
71 void sh4_translate_add_recovery( uint32_t icount )
72 {
73 xlat_recovery[xlat_recovery_posn].xlat_offset =
74 ((uintptr_t)xlat_output) - ((uintptr_t)xlat_current_block->code);
75 xlat_recovery[xlat_recovery_posn].sh4_icount = icount;
76 xlat_recovery_posn++;
77 }
79 /**
80 * Translate a linear basic block, ie all instructions from the start address
81 * (inclusive) until the next branch/jump instruction or the end of the page
82 * is reached.
83 * @param start VMA of the block start (which must already be in the icache)
84 * @return the address of the translated block
85 * eg due to lack of buffer space.
86 */
87 void * sh4_translate_basic_block( sh4addr_t start )
88 {
89 sh4addr_t pc = start;
90 sh4addr_t lastpc = (pc&0xFFFFF000)+0x1000;
91 int done, i;
92 xlat_current_block = xlat_start_block( GET_ICACHE_PHYS(start) );
93 xlat_output = (uint8_t *)xlat_current_block->code;
94 xlat_recovery_posn = 0;
95 uint8_t *eob = xlat_output + xlat_current_block->size;
97 if( GET_ICACHE_END() < lastpc ) {
98 lastpc = GET_ICACHE_END();
99 }
101 sh4_translate_begin_block(pc);
103 do {
104 if( eob - xlat_output < MAX_INSTRUCTION_SIZE ) {
105 uint8_t *oldstart = xlat_current_block->code;
106 xlat_current_block = xlat_extend_block( xlat_output - oldstart + MAX_INSTRUCTION_SIZE );
107 xlat_output = xlat_current_block->code + (xlat_output - oldstart);
108 eob = xlat_current_block->code + xlat_current_block->size;
109 }
110 done = sh4_translate_instruction( pc );
111 assert( xlat_output <= eob );
112 pc += 2;
113 if ( pc >= lastpc ) {
114 done = 2;
115 }
116 } while( !done );
117 pc += (done - 2);
119 // Add end-of-block recovery for post-instruction checks
120 sh4_translate_add_recovery( (pc - start)>>1 );
122 int epilogue_size = sh4_translate_end_block_size();
123 uint32_t recovery_size = sizeof(struct xlat_recovery_record)*xlat_recovery_posn;
124 uint32_t finalsize = (xlat_output - xlat_current_block->code) + epilogue_size + recovery_size;
125 if( xlat_current_block->size < finalsize ) {
126 uint8_t *oldstart = xlat_current_block->code;
127 xlat_current_block = xlat_extend_block( finalsize );
128 xlat_output = xlat_current_block->code + (xlat_output - oldstart);
129 }
130 sh4_translate_end_block(pc);
131 assert( xlat_output <= (xlat_current_block->code + xlat_current_block->size - recovery_size) );
133 /* Write the recovery records onto the end of the code block */
134 memcpy( xlat_output, xlat_recovery, recovery_size);
135 xlat_current_block->recover_table_offset = xlat_output - (uint8_t *)xlat_current_block->code;
136 xlat_current_block->recover_table_size = xlat_recovery_posn;
137 xlat_current_block->xlat_sh4_mode = sh4r.xlat_sh4_mode;
138 xlat_commit_block( finalsize, pc-start );
139 return xlat_current_block->code;
140 }
142 /**
143 * "Execute" the supplied recovery record. Currently this only updates
144 * sh4r.pc and sh4r.slice_cycle according to the currently executing
145 * instruction. In future this may be more sophisticated (ie will
146 * call into generated code).
147 */
148 void sh4_translate_run_recovery( xlat_recovery_record_t recovery )
149 {
150 sh4r.slice_cycle += (recovery->sh4_icount * sh4_cpu_period);
151 sh4r.pc += (recovery->sh4_icount<<1);
152 }
154 /**
155 * Same as sh4_translate_run_recovery, but is used to recover from a taken
156 * exception - that is, it fixes sh4r.spc rather than sh4r.pc
157 */
158 void sh4_translate_run_exception_recovery( xlat_recovery_record_t recovery )
159 {
160 sh4r.slice_cycle += (recovery->sh4_icount * sh4_cpu_period);
161 sh4r.spc += (recovery->sh4_icount<<1);
162 }
164 void sh4_translate_exit_recover( )
165 {
166 void *code = xlat_get_code_by_vma( sh4r.pc );
167 if( code != NULL ) {
168 uint32_t size = xlat_get_code_size( code );
169 void *pc = xlat_get_native_pc( code, size );
170 if( pc != NULL ) {
171 // could be null if we're not actually running inside the translator
172 xlat_recovery_record_t recover = xlat_get_pre_recovery(code, pc);
173 if( recover != NULL ) {
174 // Can be null if there is no recovery necessary
175 sh4_translate_run_recovery(recover);
176 }
177 }
178 }
179 }
181 void sh4_translate_exception_exit_recover( )
182 {
183 void *code = xlat_get_code_by_vma( sh4r.spc );
184 if( code != NULL ) {
185 uint32_t size = xlat_get_code_size( code );
186 void *pc = xlat_get_native_pc( code, size );
187 if( pc != NULL ) {
188 // could be null if we're not actually running inside the translator
189 xlat_recovery_record_t recover = xlat_get_pre_recovery(code, pc);
190 if( recover != NULL ) {
191 // Can be null if there is no recovery necessary
192 sh4_translate_run_exception_recovery(recover);
193 }
194 }
195 }
197 }
199 void FASTCALL sh4_translate_breakpoint_hit(uint32_t pc)
200 {
201 if( sh4_starting && sh4r.slice_cycle == 0 && pc == sh4r.pc ) {
202 return;
203 }
204 sh4_core_exit( CORE_EXIT_BREAKPOINT );
205 }
207 void * FASTCALL xlat_get_code_by_vma( sh4vma_t vma )
208 {
209 void *result = NULL;
211 if( IS_IN_ICACHE(vma) ) {
212 return xlat_get_code( GET_ICACHE_PHYS(vma) );
213 }
215 if( IS_SYSCALL(vma) ) {
216 // lxdream hook
217 return NULL;
218 }
220 if( !mmu_update_icache(vma) ) {
221 // fault - off to the fault handler
222 if( !mmu_update_icache(sh4r.pc) ) {
223 // double fault - halt
224 ERROR( "Double fault - halting" );
225 sh4_core_exit(CORE_EXIT_HALT);
226 return NULL;
227 }
228 }
230 assert( IS_IN_ICACHE(sh4r.pc) );
231 result = xlat_get_code( GET_ICACHE_PHYS(sh4r.pc) );
232 return result;
233 }
235 /**
236 * Crashdump translation information.
237 *
238 * Print out the currently executing block (if any), in source and target
239 * assembly.
240 *
241 * Note: we want to be _really_ careful not to cause a second-level crash
242 * at this point (e.g. if the lookup tables are corrupted...)
243 */
244 void sh4_translate_crashdump()
245 {
246 if( !IS_IN_ICACHE(sh4r.pc) ) {
247 /** If we're crashing due to an icache lookup failure, we'll probably
248 * hit this case - just complain and return.
249 */
250 fprintf( stderr, "** SH4 PC not in current instruction region **\n" );
251 return;
252 }
253 uint32_t pma = GET_ICACHE_PHYS(sh4r.pc);
254 void *code = xlat_get_code( pma );
255 if( code == NULL ) {
256 fprintf( stderr, "** No translated block for current SH4 PC **\n" );
257 return;
258 }
260 /* Sanity check on the code pointer */
261 if( !xlat_is_code_pointer(code) ) {
262 fprintf( stderr, "** Possibly corrupt translation cache **\n" );
263 return;
264 }
266 void *native_pc = xlat_get_native_pc( code, xlat_get_code_size(code) );
267 sh4_translate_disasm_block( stderr, code, sh4r.pc, native_pc );
268 }
270 /**
271 * Dual-dump the translated block and original SH4 code for the basic block
272 * starting at sh4_pc. If there is no translated block, this prints an error
273 * and returns.
274 */
275 void sh4_translate_dump_block( uint32_t sh4_pc )
276 {
277 if( !IS_IN_ICACHE(sh4_pc) ) {
278 fprintf( stderr, "** Address %08x not in current instruction region **\n", sh4_pc );
279 return;
280 }
281 uint32_t pma = GET_ICACHE_PHYS(sh4_pc);
282 void *code = xlat_get_code( pma );
283 if( code == NULL ) {
284 fprintf( stderr, "** No translated block for address %08x **\n", sh4_pc );
285 return;
286 }
287 sh4_translate_disasm_block( stderr, code, sh4_pc, NULL );
288 }
.