lxdream 0.9.1| filename | src/sh4/sh4trans.c |
| changeset | 417:bd927df302a9 |
| prev | 410:5f8413358e7f |
| next | 430:467519b050f4 |
| author | nkeynes |
| date | Thu Oct 04 08:47:27 2007 +0000 (14 years ago) |
| permissions | -rw-r--r-- |
| last change | Suppress redundant T flag loads Tweak run_slice for performance |
| view | annotate | diff | log | raw |
1 /**
2 * $Id: sh4trans.c,v 1.7 2007-10-04 08:47:27 nkeynes Exp $
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 "sh4core.h"
21 #include "sh4trans.h"
22 #include "xltcache.h"
24 /**
25 * Execute a timeslice using translated code only (ie translate/execute loop)
26 * Note this version does not support breakpoints
27 */
28 uint32_t sh4_xlat_run_slice( uint32_t nanosecs )
29 {
30 int i;
31 sh4r.slice_cycle = 0;
33 if( sh4r.sh4_state != SH4_STATE_RUNNING ) {
34 if( sh4r.event_pending < nanosecs ) {
35 sh4r.sh4_state = SH4_STATE_RUNNING;
36 sh4r.slice_cycle = sh4r.event_pending;
37 }
38 }
40 void * (*code)() = NULL;
41 while( sh4r.slice_cycle < nanosecs ) {
42 if( sh4r.event_pending <= sh4r.slice_cycle ) {
43 if( sh4r.event_types & PENDING_EVENT ) {
44 event_execute();
45 }
46 /* Eventq execute may (quite likely) deliver an immediate IRQ */
47 if( sh4r.event_types & PENDING_IRQ ) {
48 sh4_accept_interrupt();
49 code = NULL;
50 }
51 }
53 if( code == NULL ) {
54 if( sh4r.pc > 0xFFFFFF00 ) {
55 syscall_invoke( sh4r.pc );
56 sh4r.in_delay_slot = 0;
57 sh4r.pc = sh4r.pr;
58 }
60 code = xlat_get_code(sh4r.pc);
61 if( code == NULL ) {
62 code = sh4_translate_basic_block( sh4r.pc );
63 }
64 }
65 code = code();
66 }
68 if( sh4r.sh4_state != SH4_STATE_STANDBY ) {
69 TMU_run_slice( nanosecs );
70 SCIF_run_slice( nanosecs );
71 }
72 return nanosecs;
73 }
75 uint8_t *xlat_output;
77 /**
78 * Translate a linear basic block, ie all instructions from the start address
79 * (inclusive) until the next branch/jump instruction or the end of the page
80 * is reached.
81 * @return the address of the translated block
82 * eg due to lack of buffer space.
83 */
84 void * sh4_translate_basic_block( sh4addr_t start )
85 {
86 sh4addr_t pc = start;
87 sh4addr_t lastpc = (pc&0xFFFFF000)+0x1000;
88 int done;
89 xlat_cache_block_t block = xlat_start_block( start );
90 xlat_output = (uint8_t *)block->code;
91 uint8_t *eob = xlat_output + block->size;
92 sh4_translate_begin_block(pc);
94 do {
95 if( eob - xlat_output < MAX_INSTRUCTION_SIZE ) {
96 uint8_t *oldstart = block->code;
97 block = xlat_extend_block( xlat_output - oldstart + MAX_INSTRUCTION_SIZE );
98 xlat_output = block->code + (xlat_output - oldstart);
99 eob = block->code + block->size;
100 }
101 done = sh4_x86_translate_instruction( pc );
102 assert( xlat_output <= eob );
103 pc += 2;
104 if ( pc >= lastpc ) {
105 done = 2;
106 }
107 } while( !done );
108 pc += (done - 2);
109 if( eob - xlat_output < EPILOGUE_SIZE ) {
110 uint8_t *oldstart = block->code;
111 block = xlat_extend_block( xlat_output - oldstart + EPILOGUE_SIZE );
112 xlat_output = block->code + (xlat_output - oldstart);
113 }
114 sh4_translate_end_block(pc);
115 xlat_commit_block( xlat_output - block->code, pc-start );
116 return block->code;
117 }
119 /**
120 * Translate a linear basic block to a temporary buffer, execute it, and return
121 * the result of the execution. The translation is discarded.
122 */
123 void *sh4_translate_and_run( sh4addr_t start )
124 {
125 char buf[65536];
127 uint32_t pc = start;
128 int done;
129 xlat_output = buf;
130 uint8_t *eob = xlat_output + sizeof(buf);
132 sh4_translate_begin_block(pc);
134 while( (done = sh4_x86_translate_instruction( pc )) == 0 ) {
135 assert( (eob - xlat_output) >= MAX_INSTRUCTION_SIZE );
136 pc += 2;
137 }
138 pc+=2;
139 sh4_translate_end_block(pc);
141 void * (*code)() = (void *)buf;
142 return code();
143 }
.