filename | src/sh4/sh4trans.c |
changeset | 1103:de9ad2c0cf56 |
prev | 1094:d2324eb67223 |
next | 1112:4cac5e474d4c |
author | nkeynes |
date | Sun Feb 21 11:19:59 2010 +1000 (14 years ago) |
permissions | -rw-r--r-- |
last change | Update sh4r.pc before doing the syscall - mainly so that debugging etc statements come out with a useful PC value rather than the syscall id |
view | annotate | diff | log | raw |
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 while( sh4r.slice_cycle < nanosecs ) {
37 if( sh4r.event_pending <= sh4r.slice_cycle ) {
38 if( sh4r.event_types & PENDING_EVENT ) {
39 event_execute();
40 }
41 /* Eventq execute may (quite likely) deliver an immediate IRQ */
42 if( sh4r.event_types & PENDING_IRQ ) {
43 sh4_accept_interrupt();
44 code = NULL;
45 }
46 }
48 if( code == NULL ) {
49 if( IS_SYSCALL(sh4r.pc) ) {
50 uint32_t pc = sh4r.pc;
51 sh4r.pc = sh4r.pr;
52 sh4r.in_delay_slot = 0;
53 syscall_invoke( pc );
54 }
56 code = xlat_get_code_by_vma( sh4r.pc );
57 if( code == NULL || sh4r.xlat_sh4_mode != XLAT_BLOCK_MODE(code) ) {
58 code = sh4_translate_basic_block( sh4r.pc );
59 }
60 } else if( sh4r.xlat_sh4_mode != XLAT_BLOCK_MODE(code) ) {
61 if( !IS_IN_ICACHE(sh4r.pc) ) {
62 /* If TLB is off, we may have gotten here without updating
63 * the icache, so do it now. This should never fail, so...
64 */
65 mmu_update_icache(sh4r.pc);
66 assert( IS_IN_ICACHE(sh4r.pc) );
67 }
68 code = sh4_translate_basic_block( sh4r.pc );
69 }
70 code = code();
71 }
72 return nanosecs;
73 }
75 uint8_t *xlat_output;
76 xlat_cache_block_t xlat_current_block;
77 struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
78 uint32_t xlat_recovery_posn;
80 void sh4_translate_add_recovery( uint32_t icount )
81 {
82 xlat_recovery[xlat_recovery_posn].xlat_offset =
83 ((uintptr_t)xlat_output) - ((uintptr_t)xlat_current_block->code);
84 xlat_recovery[xlat_recovery_posn].sh4_icount = icount;
85 xlat_recovery_posn++;
86 }
88 /**
89 * Translate a linear basic block, ie all instructions from the start address
90 * (inclusive) until the next branch/jump instruction or the end of the page
91 * is reached.
92 * @param start VMA of the block start (which must already be in the icache)
93 * @return the address of the translated block
94 * eg due to lack of buffer space.
95 */
96 void * sh4_translate_basic_block( sh4addr_t start )
97 {
98 sh4addr_t pc = start;
99 sh4addr_t lastpc = (pc&0xFFFFF000)+0x1000;
100 int done, i;
101 xlat_current_block = xlat_start_block( GET_ICACHE_PHYS(start) );
102 xlat_output = (uint8_t *)xlat_current_block->code;
103 xlat_recovery_posn = 0;
104 uint8_t *eob = xlat_output + xlat_current_block->size;
106 if( GET_ICACHE_END() < lastpc ) {
107 lastpc = GET_ICACHE_END();
108 }
110 sh4_translate_begin_block(pc);
112 do {
113 if( eob - xlat_output < MAX_INSTRUCTION_SIZE ) {
114 uint8_t *oldstart = xlat_current_block->code;
115 xlat_current_block = xlat_extend_block( xlat_output - oldstart + MAX_INSTRUCTION_SIZE );
116 xlat_output = xlat_current_block->code + (xlat_output - oldstart);
117 eob = xlat_current_block->code + xlat_current_block->size;
118 }
119 done = sh4_translate_instruction( pc );
120 assert( xlat_output <= eob );
121 pc += 2;
122 if ( pc >= lastpc ) {
123 done = 2;
124 }
125 } while( !done );
126 pc += (done - 2);
128 // Add end-of-block recovery for post-instruction checks
129 sh4_translate_add_recovery( (pc - start)>>1 );
131 int epilogue_size = sh4_translate_end_block_size();
132 uint32_t recovery_size = sizeof(struct xlat_recovery_record)*xlat_recovery_posn;
133 uint32_t finalsize = (xlat_output - xlat_current_block->code) + epilogue_size + recovery_size;
134 if( xlat_current_block->size < finalsize ) {
135 uint8_t *oldstart = xlat_current_block->code;
136 xlat_current_block = xlat_extend_block( finalsize );
137 xlat_output = xlat_current_block->code + (xlat_output - oldstart);
138 }
139 sh4_translate_end_block(pc);
140 assert( xlat_output <= (xlat_current_block->code + xlat_current_block->size - recovery_size) );
142 /* Write the recovery records onto the end of the code block */
143 memcpy( xlat_output, xlat_recovery, recovery_size);
144 xlat_current_block->recover_table_offset = xlat_output - (uint8_t *)xlat_current_block->code;
145 xlat_current_block->recover_table_size = xlat_recovery_posn;
146 xlat_current_block->xlat_sh4_mode = sh4r.xlat_sh4_mode;
147 xlat_commit_block( finalsize, pc-start );
148 return xlat_current_block->code;
149 }
151 /**
152 * "Execute" the supplied recovery record. Currently this only updates
153 * sh4r.pc and sh4r.slice_cycle according to the currently executing
154 * instruction. In future this may be more sophisticated (ie will
155 * call into generated code).
156 */
157 void sh4_translate_run_recovery( xlat_recovery_record_t recovery )
158 {
159 sh4r.slice_cycle += (recovery->sh4_icount * sh4_cpu_period);
160 sh4r.pc += (recovery->sh4_icount<<1);
161 }
163 /**
164 * Same as sh4_translate_run_recovery, but is used to recover from a taken
165 * exception - that is, it fixes sh4r.spc rather than sh4r.pc
166 */
167 void sh4_translate_run_exception_recovery( xlat_recovery_record_t recovery )
168 {
169 sh4r.slice_cycle += (recovery->sh4_icount * sh4_cpu_period);
170 sh4r.spc += (recovery->sh4_icount<<1);
171 }
173 void sh4_translate_exit_recover( )
174 {
175 void *code = xlat_get_code_by_vma( sh4r.pc );
176 if( code != NULL ) {
177 uint32_t size = xlat_get_code_size( code );
178 void *pc = xlat_get_native_pc( code, size );
179 if( pc != NULL ) {
180 // could be null if we're not actually running inside the translator
181 xlat_recovery_record_t recover = xlat_get_pre_recovery(code, pc);
182 if( recover != NULL ) {
183 // Can be null if there is no recovery necessary
184 sh4_translate_run_recovery(recover);
185 }
186 }
187 }
188 }
190 void sh4_translate_exception_exit_recover( )
191 {
192 void *code = xlat_get_code_by_vma( sh4r.spc );
193 if( code != NULL ) {
194 uint32_t size = xlat_get_code_size( code );
195 void *pc = xlat_get_native_pc( code, size );
196 if( pc != NULL ) {
197 // could be null if we're not actually running inside the translator
198 xlat_recovery_record_t recover = xlat_get_pre_recovery(code, pc);
199 if( recover != NULL ) {
200 // Can be null if there is no recovery necessary
201 sh4_translate_run_exception_recovery(recover);
202 }
203 }
204 }
206 }
208 void FASTCALL sh4_translate_breakpoint_hit(uint32_t pc)
209 {
210 if( sh4_starting && sh4r.slice_cycle == 0 && pc == sh4r.pc ) {
211 return;
212 }
213 sh4_core_exit( CORE_EXIT_BREAKPOINT );
214 }
216 void * FASTCALL xlat_get_code_by_vma( sh4vma_t vma )
217 {
218 void *result = NULL;
220 if( IS_IN_ICACHE(vma) ) {
221 return xlat_get_code( GET_ICACHE_PHYS(vma) );
222 }
224 if( IS_SYSCALL(vma) ) {
225 // lxdream hook
226 return NULL;
227 }
229 if( !mmu_update_icache(vma) ) {
230 // fault - off to the fault handler
231 if( !mmu_update_icache(sh4r.pc) ) {
232 // double fault - halt
233 ERROR( "Double fault - halting" );
234 sh4_core_exit(CORE_EXIT_HALT);
235 return NULL;
236 }
237 }
239 assert( IS_IN_ICACHE(sh4r.pc) );
240 result = xlat_get_code( GET_ICACHE_PHYS(sh4r.pc) );
241 return result;
242 }
244 /**
245 * Crashdump translation information.
246 *
247 * Print out the currently executing block (if any), in source and target
248 * assembly.
249 *
250 * Note: we want to be _really_ careful not to cause a second-level crash
251 * at this point (e.g. if the lookup tables are corrupted...)
252 */
253 void sh4_translate_crashdump()
254 {
255 if( !IS_IN_ICACHE(sh4r.pc) ) {
256 /** If we're crashing due to an icache lookup failure, we'll probably
257 * hit this case - just complain and return.
258 */
259 fprintf( stderr, "** SH4 PC not in current instruction region **\n" );
260 return;
261 }
262 uint32_t pma = GET_ICACHE_PHYS(sh4r.pc);
263 void *code = xlat_get_code( pma );
264 if( code == NULL ) {
265 fprintf( stderr, "** No translated block for current SH4 PC **\n" );
266 return;
267 }
269 /* Sanity check on the code pointer */
270 if( !xlat_is_code_pointer(code) ) {
271 fprintf( stderr, "** Possibly corrupt translation cache **\n" );
272 return;
273 }
275 void *native_pc = xlat_get_native_pc( code, xlat_get_code_size(code) );
276 sh4_translate_disasm_block( stderr, code, sh4r.pc, native_pc );
277 }
279 /**
280 * Dual-dump the translated block and original SH4 code for the basic block
281 * starting at sh4_pc. If there is no translated block, this prints an error
282 * and returns.
283 */
284 void sh4_translate_dump_block( uint32_t sh4_pc )
285 {
286 if( !IS_IN_ICACHE(sh4_pc) ) {
287 fprintf( stderr, "** Address %08x not in current instruction region **\n", sh4_pc );
288 return;
289 }
290 uint32_t pma = GET_ICACHE_PHYS(sh4_pc);
291 void *code = xlat_get_code( pma );
292 if( code == NULL ) {
293 fprintf( stderr, "** No translated block for address %08x **\n", sh4_pc );
294 return;
295 }
296 sh4_translate_disasm_block( stderr, code, sh4_pc, NULL );
297 }
.