lxdream 0.9.1| filename | src/sh4/sh4trans.c |
| changeset | 408:af496b734734 |
| prev | 398:16b0856ea511 |
| next | 410:5f8413358e7f |
| author | nkeynes |
| date | Fri Sep 28 07:27:20 2007 +0000 (14 years ago) |
| permissions | -rw-r--r-- |
| last change | Change block signature to return pointer to next block (if known) Rewrite block-exit code |
| view | annotate | diff | log | raw |
1 /**
2 * $Id: sh4trans.c,v 1.5 2007-09-28 07:27:20 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 ) { // fast path
54 code = code();
55 } else {
56 if( sh4r.pc > 0xFFFFFF00 ) {
57 syscall_invoke( sh4r.pc );
58 sh4r.in_delay_slot = 0;
59 sh4r.pc = sh4r.pr;
60 }
62 code = xlat_get_code(sh4r.pc);
63 if( code == NULL ) {
64 code = sh4_translate_basic_block( sh4r.pc );
65 }
66 code = code();
67 }
68 }
70 if( sh4r.sh4_state != SH4_STATE_STANDBY ) {
71 TMU_run_slice( nanosecs );
72 SCIF_run_slice( nanosecs );
73 }
74 return nanosecs;
75 }
77 uint8_t *xlat_output;
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 * @return the address of the translated block
84 * eg due to lack of buffer space.
85 */
86 void * sh4_translate_basic_block( sh4addr_t start )
87 {
88 sh4addr_t pc = start;
89 int done;
90 xlat_cache_block_t block = xlat_start_block( start );
91 xlat_output = (uint8_t *)block->code;
92 uint8_t *eob = xlat_output + block->size;
93 sh4_translate_begin_block(pc);
95 do {
96 if( eob - xlat_output < MAX_INSTRUCTION_SIZE ) {
97 uint8_t *oldstart = block->code;
98 block = xlat_extend_block();
99 xlat_output = block->code + (xlat_output - oldstart);
100 eob = block->code + block->size;
101 }
102 done = sh4_x86_translate_instruction( pc );
103 pc += 2;
104 } while( !done );
105 pc += (done - 2);
106 sh4_translate_end_block(pc);
107 xlat_commit_block( xlat_output - block->code, pc-start );
108 return block->code;
109 }
111 /**
112 * Translate a linear basic block to a temporary buffer, execute it, and return
113 * the result of the execution. The translation is discarded.
114 */
115 void *sh4_translate_and_run( sh4addr_t start )
116 {
117 char buf[65536];
119 uint32_t pc = start;
120 int done;
121 xlat_output = buf;
122 uint8_t *eob = xlat_output + sizeof(buf);
124 sh4_translate_begin_block(pc);
126 while( (done = sh4_x86_translate_instruction( pc )) == 0 ) {
127 assert( (eob - xlat_output) >= MAX_INSTRUCTION_SIZE );
128 pc += 2;
129 }
130 pc+=2;
131 sh4_translate_end_block(pc);
133 void * (*code)() = (void *)buf;
134 return code();
135 }
.