nkeynes@359 | 1 | /**
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nkeynes@586 | 2 | * $Id$
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nkeynes@359 | 3 | *
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nkeynes@359 | 4 | * SH4 translation core module. This part handles the non-target-specific
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nkeynes@359 | 5 | * section of the translation.
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nkeynes@359 | 6 | *
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nkeynes@359 | 7 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@359 | 8 | *
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nkeynes@359 | 9 | * This program is free software; you can redistribute it and/or modify
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nkeynes@359 | 10 | * it under the terms of the GNU General Public License as published by
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nkeynes@359 | 11 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@359 | 12 | * (at your option) any later version.
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nkeynes@359 | 13 | *
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nkeynes@359 | 14 | * This program is distributed in the hope that it will be useful,
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nkeynes@359 | 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@359 | 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@359 | 17 | * GNU General Public License for more details.
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nkeynes@359 | 18 | */
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nkeynes@398 | 19 | #include <assert.h>
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nkeynes@586 | 20 | #include <setjmp.h>
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nkeynes@430 | 21 | #include "eventq.h"
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nkeynes@430 | 22 | #include "syscall.h"
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nkeynes@586 | 23 | #include "clock.h"
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nkeynes@430 | 24 | #include "sh4/sh4core.h"
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nkeynes@430 | 25 | #include "sh4/sh4trans.h"
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nkeynes@430 | 26 | #include "sh4/xltcache.h"
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nkeynes@359 | 27 |
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nkeynes@586 | 28 |
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nkeynes@586 | 29 | static jmp_buf xlat_jmp_buf;
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nkeynes@586 | 30 | static gboolean xlat_running = FALSE;
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nkeynes@586 | 31 |
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nkeynes@586 | 32 | gboolean sh4_xlat_is_running()
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nkeynes@586 | 33 | {
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nkeynes@586 | 34 | return xlat_running;
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nkeynes@586 | 35 | }
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nkeynes@586 | 36 |
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nkeynes@359 | 37 | /**
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nkeynes@359 | 38 | * Execute a timeslice using translated code only (ie translate/execute loop)
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nkeynes@359 | 39 | * Note this version does not support breakpoints
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nkeynes@359 | 40 | */
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nkeynes@359 | 41 | uint32_t sh4_xlat_run_slice( uint32_t nanosecs )
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nkeynes@359 | 42 | {
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nkeynes@359 | 43 | sh4r.slice_cycle = 0;
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nkeynes@359 | 44 |
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nkeynes@359 | 45 | if( sh4r.sh4_state != SH4_STATE_RUNNING ) {
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nkeynes@359 | 46 | if( sh4r.event_pending < nanosecs ) {
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nkeynes@359 | 47 | sh4r.sh4_state = SH4_STATE_RUNNING;
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nkeynes@359 | 48 | sh4r.slice_cycle = sh4r.event_pending;
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nkeynes@359 | 49 | }
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nkeynes@359 | 50 | }
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nkeynes@359 | 51 |
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nkeynes@586 | 52 | switch( setjmp(xlat_jmp_buf) ) {
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nkeynes@586 | 53 | case XLAT_EXIT_BREAKPOINT:
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nkeynes@586 | 54 | sh4_clear_breakpoint( sh4r.pc, BREAK_ONESHOT );
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nkeynes@586 | 55 | /* fallthrough */
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nkeynes@586 | 56 | case XLAT_EXIT_HALT:
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nkeynes@586 | 57 | if( sh4r.sh4_state != SH4_STATE_STANDBY ) {
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nkeynes@586 | 58 | TMU_run_slice( sh4r.slice_cycle );
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nkeynes@586 | 59 | SCIF_run_slice( sh4r.slice_cycle );
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nkeynes@586 | 60 | dreamcast_stop();
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nkeynes@586 | 61 | return sh4r.slice_cycle;
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nkeynes@586 | 62 | }
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nkeynes@586 | 63 | case XLAT_EXIT_SYSRESET:
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nkeynes@586 | 64 | dreamcast_reset();
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nkeynes@586 | 65 | break;
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nkeynes@586 | 66 | }
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nkeynes@586 | 67 |
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nkeynes@586 | 68 | xlat_running = TRUE;
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nkeynes@408 | 69 | void * (*code)() = NULL;
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nkeynes@368 | 70 | while( sh4r.slice_cycle < nanosecs ) {
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nkeynes@408 | 71 | if( sh4r.event_pending <= sh4r.slice_cycle ) {
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nkeynes@359 | 72 | if( sh4r.event_types & PENDING_EVENT ) {
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nkeynes@359 | 73 | event_execute();
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nkeynes@359 | 74 | }
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nkeynes@359 | 75 | /* Eventq execute may (quite likely) deliver an immediate IRQ */
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nkeynes@359 | 76 | if( sh4r.event_types & PENDING_IRQ ) {
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nkeynes@359 | 77 | sh4_accept_interrupt();
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nkeynes@408 | 78 | code = NULL;
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nkeynes@359 | 79 | }
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nkeynes@359 | 80 | }
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nkeynes@408 | 81 |
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nkeynes@417 | 82 | if( code == NULL ) {
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nkeynes@408 | 83 | if( sh4r.pc > 0xFFFFFF00 ) {
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nkeynes@408 | 84 | syscall_invoke( sh4r.pc );
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nkeynes@408 | 85 | sh4r.in_delay_slot = 0;
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nkeynes@408 | 86 | sh4r.pc = sh4r.pr;
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nkeynes@408 | 87 | }
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nkeynes@359 | 88 |
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nkeynes@586 | 89 | code = xlat_get_code_by_vma( sh4r.pc );
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nkeynes@408 | 90 | if( code == NULL ) {
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nkeynes@408 | 91 | code = sh4_translate_basic_block( sh4r.pc );
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nkeynes@408 | 92 | }
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nkeynes@390 | 93 | }
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nkeynes@417 | 94 | code = code();
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nkeynes@359 | 95 | }
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nkeynes@359 | 96 |
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nkeynes@586 | 97 | xlat_running = FALSE;
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nkeynes@586 | 98 |
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nkeynes@359 | 99 | if( sh4r.sh4_state != SH4_STATE_STANDBY ) {
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nkeynes@359 | 100 | TMU_run_slice( nanosecs );
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nkeynes@359 | 101 | SCIF_run_slice( nanosecs );
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nkeynes@359 | 102 | }
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nkeynes@359 | 103 | return nanosecs;
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nkeynes@359 | 104 | }
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nkeynes@359 | 105 |
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nkeynes@359 | 106 | uint8_t *xlat_output;
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nkeynes@586 | 107 | struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
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nkeynes@586 | 108 | uint32_t xlat_recovery_posn;
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nkeynes@359 | 109 |
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nkeynes@359 | 110 | /**
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nkeynes@359 | 111 | * Translate a linear basic block, ie all instructions from the start address
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nkeynes@359 | 112 | * (inclusive) until the next branch/jump instruction or the end of the page
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nkeynes@359 | 113 | * is reached.
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nkeynes@359 | 114 | * @return the address of the translated block
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nkeynes@359 | 115 | * eg due to lack of buffer space.
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nkeynes@359 | 116 | */
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nkeynes@359 | 117 | void * sh4_translate_basic_block( sh4addr_t start )
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nkeynes@359 | 118 | {
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nkeynes@408 | 119 | sh4addr_t pc = start;
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nkeynes@410 | 120 | sh4addr_t lastpc = (pc&0xFFFFF000)+0x1000;
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nkeynes@586 | 121 | int done, i;
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nkeynes@359 | 122 | xlat_cache_block_t block = xlat_start_block( start );
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nkeynes@359 | 123 | xlat_output = (uint8_t *)block->code;
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nkeynes@586 | 124 | xlat_recovery_posn = 0;
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nkeynes@359 | 125 | uint8_t *eob = xlat_output + block->size;
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nkeynes@588 | 126 |
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nkeynes@588 | 127 | if( GET_ICACHE_END() < lastpc ) {
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nkeynes@588 | 128 | lastpc = GET_ICACHE_END();
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nkeynes@588 | 129 | }
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nkeynes@588 | 130 |
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nkeynes@408 | 131 | sh4_translate_begin_block(pc);
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nkeynes@359 | 132 |
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nkeynes@408 | 133 | do {
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nkeynes@586 | 134 | /* check for breakpoints at this pc */
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nkeynes@586 | 135 | for( i=0; i<sh4_breakpoint_count; i++ ) {
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nkeynes@586 | 136 | if( sh4_breakpoints[i].address == pc ) {
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nkeynes@586 | 137 | sh4_translate_emit_breakpoint(pc);
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nkeynes@586 | 138 | break;
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nkeynes@586 | 139 | }
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nkeynes@586 | 140 | }
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nkeynes@359 | 141 | if( eob - xlat_output < MAX_INSTRUCTION_SIZE ) {
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nkeynes@359 | 142 | uint8_t *oldstart = block->code;
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nkeynes@410 | 143 | block = xlat_extend_block( xlat_output - oldstart + MAX_INSTRUCTION_SIZE );
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nkeynes@359 | 144 | xlat_output = block->code + (xlat_output - oldstart);
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nkeynes@359 | 145 | eob = block->code + block->size;
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nkeynes@359 | 146 | }
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nkeynes@527 | 147 | done = sh4_translate_instruction( pc );
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nkeynes@410 | 148 | assert( xlat_output <= eob );
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nkeynes@359 | 149 | pc += 2;
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nkeynes@410 | 150 | if ( pc >= lastpc ) {
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nkeynes@410 | 151 | done = 2;
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nkeynes@410 | 152 | }
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nkeynes@408 | 153 | } while( !done );
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nkeynes@408 | 154 | pc += (done - 2);
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nkeynes@410 | 155 | if( eob - xlat_output < EPILOGUE_SIZE ) {
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nkeynes@410 | 156 | uint8_t *oldstart = block->code;
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nkeynes@410 | 157 | block = xlat_extend_block( xlat_output - oldstart + EPILOGUE_SIZE );
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nkeynes@410 | 158 | xlat_output = block->code + (xlat_output - oldstart);
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nkeynes@410 | 159 | }
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nkeynes@368 | 160 | sh4_translate_end_block(pc);
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nkeynes@586 | 161 |
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nkeynes@586 | 162 | /* Write the recovery records onto the end of the code block */
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nkeynes@586 | 163 | uint32_t recovery_size = sizeof(struct xlat_recovery_record)*xlat_recovery_posn;
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nkeynes@586 | 164 | uint32_t finalsize = xlat_output - block->code + recovery_size;
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nkeynes@586 | 165 | if( finalsize > block->size ) {
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nkeynes@586 | 166 | uint8_t *oldstart = block->code;
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nkeynes@586 | 167 | block = xlat_extend_block( finalsize );
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nkeynes@586 | 168 | xlat_output = block->code + (xlat_output - oldstart);
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nkeynes@586 | 169 | }
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nkeynes@586 | 170 | memcpy( xlat_output, xlat_recovery, recovery_size);
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nkeynes@586 | 171 | block->recover_table = (xlat_recovery_record_t)xlat_output;
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nkeynes@586 | 172 | block->recover_table_size = xlat_recovery_posn;
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nkeynes@586 | 173 | xlat_commit_block( finalsize, pc-start );
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nkeynes@359 | 174 | return block->code;
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nkeynes@359 | 175 | }
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nkeynes@359 | 176 |
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nkeynes@398 | 177 | /**
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nkeynes@586 | 178 | * "Execute" the supplied recovery record. Currently this only updates
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nkeynes@586 | 179 | * sh4r.pc and sh4r.slice_cycle according to the currently executing
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nkeynes@586 | 180 | * instruction. In future this may be more sophisticated (ie will
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nkeynes@586 | 181 | * call into generated code).
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nkeynes@398 | 182 | */
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nkeynes@586 | 183 | void sh4_translate_run_recovery( xlat_recovery_record_t recovery )
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nkeynes@398 | 184 | {
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nkeynes@586 | 185 | sh4r.slice_cycle += (recovery->sh4_icount * sh4_cpu_period);
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nkeynes@586 | 186 | sh4r.pc += (recovery->sh4_icount<<1);
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nkeynes@586 | 187 | }
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nkeynes@359 | 188 |
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nkeynes@586 | 189 | void sh4_translate_unwind_stack( gboolean abort_after, unwind_thunk_t thunk )
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nkeynes@586 | 190 | {
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nkeynes@586 | 191 | void *pc = xlat_get_native_pc();
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nkeynes@398 | 192 |
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nkeynes@586 | 193 | assert( pc != NULL );
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nkeynes@586 | 194 | void *code = xlat_get_code( sh4r.pc );
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nkeynes@586 | 195 | xlat_recovery_record_t recover = xlat_get_recovery(code, pc, TRUE);
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nkeynes@586 | 196 | if( recover != NULL ) {
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nkeynes@586 | 197 | // Can be null if there is no recovery necessary
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nkeynes@586 | 198 | sh4_translate_run_recovery(recover);
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nkeynes@586 | 199 | }
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nkeynes@586 | 200 | if( thunk != NULL ) {
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nkeynes@586 | 201 | thunk();
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nkeynes@586 | 202 | }
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nkeynes@586 | 203 | // finally longjmp back into sh4_xlat_run_slice
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nkeynes@586 | 204 | xlat_running = FALSE;
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nkeynes@586 | 205 | longjmp(xlat_jmp_buf, XLAT_EXIT_CONTINUE);
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nkeynes@586 | 206 | }
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nkeynes@398 | 207 |
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nkeynes@586 | 208 | void sh4_translate_exit( int exit_code )
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nkeynes@586 | 209 | {
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nkeynes@586 | 210 | void *pc = xlat_get_native_pc();
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nkeynes@586 | 211 | if( pc != NULL ) {
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nkeynes@586 | 212 | // could be null if we're not actually running inside the translator
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nkeynes@586 | 213 | void *code = xlat_get_code( sh4r.pc );
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nkeynes@586 | 214 | xlat_recovery_record_t recover = xlat_get_recovery(code, pc, TRUE);
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nkeynes@586 | 215 | if( recover != NULL ) {
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nkeynes@586 | 216 | // Can be null if there is no recovery necessary
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nkeynes@586 | 217 | sh4_translate_run_recovery(recover);
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nkeynes@586 | 218 | }
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nkeynes@398 | 219 | }
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nkeynes@586 | 220 | // finally longjmp back into sh4_xlat_run_slice
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nkeynes@586 | 221 | xlat_running = FALSE;
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nkeynes@586 | 222 | longjmp(xlat_jmp_buf, exit_code);
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nkeynes@586 | 223 | }
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nkeynes@398 | 224 |
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nkeynes@586 | 225 | /**
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nkeynes@586 | 226 | * Exit the current block at the end of the current instruction, flush the
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nkeynes@586 | 227 | * translation cache (completely) and return control to sh4_xlat_run_slice.
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nkeynes@586 | 228 | *
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nkeynes@586 | 229 | * As a special case, if the current instruction is actually the last
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nkeynes@586 | 230 | * instruction in the block (ie it's in a delay slot), this function
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nkeynes@586 | 231 | * returns to allow normal completion of the translation block. Otherwise
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nkeynes@586 | 232 | * this function never returns.
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nkeynes@586 | 233 | *
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nkeynes@586 | 234 | * Must only be invoked (indirectly) from within translated code.
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nkeynes@586 | 235 | */
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nkeynes@586 | 236 | void sh4_translate_flush_cache()
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nkeynes@586 | 237 | {
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nkeynes@586 | 238 | void *pc = xlat_get_native_pc();
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nkeynes@586 | 239 | assert( pc != NULL );
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nkeynes@586 | 240 |
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nkeynes@586 | 241 | void *code = xlat_get_code( sh4r.pc );
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nkeynes@586 | 242 | xlat_recovery_record_t recover = xlat_get_recovery(code, pc, TRUE);
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nkeynes@586 | 243 | if( recover != NULL ) {
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nkeynes@586 | 244 | // Can be null if there is no recovery necessary
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nkeynes@586 | 245 | sh4_translate_run_recovery(recover);
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nkeynes@586 | 246 | xlat_flush_cache();
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nkeynes@586 | 247 | xlat_running = FALSE;
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nkeynes@586 | 248 | longjmp(xlat_jmp_buf, XLAT_EXIT_CONTINUE);
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nkeynes@586 | 249 | } else {
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nkeynes@586 | 250 | xlat_flush_cache();
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nkeynes@586 | 251 | return;
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nkeynes@586 | 252 | }
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nkeynes@398 | 253 | }
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nkeynes@586 | 254 |
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nkeynes@586 | 255 | void *xlat_get_code_by_vma( sh4vma_t vma )
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nkeynes@586 | 256 | {
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nkeynes@586 | 257 | void *result = NULL;
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nkeynes@586 | 258 |
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nkeynes@588 | 259 | if( IS_IN_ICACHE(vma) ) {
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nkeynes@586 | 260 | result = xlat_get_code( GET_ICACHE_PHYS(vma) );
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nkeynes@586 | 261 | }
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nkeynes@586 | 262 |
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nkeynes@588 | 263 | if( vma > 0xFFFFFF00 ) {
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nkeynes@588 | 264 | // lxdream hook
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nkeynes@588 | 265 | return NULL;
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nkeynes@588 | 266 | }
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nkeynes@588 | 267 |
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nkeynes@588 | 268 | if( !mmu_update_icache(vma) ) {
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nkeynes@588 | 269 | // fault - off to the fault handler
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nkeynes@588 | 270 | if( !mmu_update_icache(sh4r.pc) ) {
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nkeynes@588 | 271 | // double fault - halt
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nkeynes@588 | 272 | ERROR( "Double fault - halting" );
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nkeynes@588 | 273 | dreamcast_stop();
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nkeynes@588 | 274 | return NULL;
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nkeynes@588 | 275 | }
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nkeynes@588 | 276 | }
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nkeynes@588 | 277 |
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nkeynes@588 | 278 | assert( IS_IN_ICACHE(sh4r.pc) );
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nkeynes@588 | 279 | result = xlat_get_code( GET_ICACHE_PHYS(sh4r.pc) );
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nkeynes@586 | 280 | return result;
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nkeynes@586 | 281 | }
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nkeynes@586 | 282 |
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