lxdream 0.9.1| filename | src/sh4/sh4trans.c |
| changeset | 368:36fac4c42322 |
| prev | 359:c588dce7ebde |
| next | 390:d066209999f1 |
| author | nkeynes |
| date | Wed Sep 12 09:20:38 2007 +0000 (16 years ago) |
| permissions | -rw-r--r-- |
| last change | Start splitting the common SH4 parts into sh4.c, with sh4core.c to become just the emulation core. |
| view | annotate | diff | log | raw |
1 /**
2 * $Id: sh4trans.c,v 1.2 2007-09-04 08:40:23 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 */
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 while( sh4r.slice_cycle < nanosecs ) {
41 if( SH4_EVENT_PENDING() ) {
42 if( sh4r.event_types & PENDING_EVENT ) {
43 event_execute();
44 }
45 /* Eventq execute may (quite likely) deliver an immediate IRQ */
46 if( sh4r.event_types & PENDING_IRQ ) {
47 sh4_accept_interrupt();
48 }
49 }
51 gboolean (*code)() = xlat_get_code(sh4r.pc);
52 if( code == NULL ) {
53 code = sh4_translate_basic_block( sh4r.pc );
54 }
55 if( !code() )
56 break;
57 }
59 /* If we aborted early, but the cpu is still technically running,
60 * we're doing a hard abort - cut the timeslice back to what we
61 * actually executed
62 */
63 if( sh4r.slice_cycle < nanosecs && sh4r.sh4_state == SH4_STATE_RUNNING ) {
64 nanosecs = sh4r.slice_cycle;
65 }
66 if( sh4r.sh4_state != SH4_STATE_STANDBY ) {
67 TMU_run_slice( nanosecs );
68 SCIF_run_slice( nanosecs );
69 }
70 return nanosecs;
71 }
73 uint8_t *xlat_output;
75 /**
76 * Translate a linear basic block, ie all instructions from the start address
77 * (inclusive) until the next branch/jump instruction or the end of the page
78 * is reached.
79 * @return the address of the translated block
80 * eg due to lack of buffer space.
81 */
82 void * sh4_translate_basic_block( sh4addr_t start )
83 {
84 uint32_t pc = start;
85 int done;
86 xlat_cache_block_t block = xlat_start_block( start );
87 xlat_output = (uint8_t *)block->code;
88 uint8_t *eob = xlat_output + block->size;
89 sh4_translate_begin_block();
91 while( (done = sh4_x86_translate_instruction( pc )) == 0 ) {
92 if( eob - xlat_output < MAX_INSTRUCTION_SIZE ) {
93 uint8_t *oldstart = block->code;
94 block = xlat_extend_block();
95 xlat_output = block->code + (xlat_output - oldstart);
96 eob = block->code + block->size;
97 }
98 pc += 2;
99 }
100 sh4_translate_end_block(pc);
101 xlat_commit_block( xlat_output - block->code, pc-start );
102 return block->code;
103 }
.