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@430 | 20 | #include "eventq.h"
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nkeynes@430 | 21 | #include "syscall.h"
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nkeynes@586 | 22 | #include "clock.h"
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nkeynes@669 | 23 | #include "dreamcast.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@975 | 26 | #include "sh4/sh4mmio.h"
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nkeynes@975 | 27 | #include "sh4/mmu.h"
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nkeynes@991 | 28 | #include "xlat/xltcache.h"
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nkeynes@586 | 29 |
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nkeynes@1125 | 30 | //#define SINGLESTEP 1
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nkeynes@1125 | 31 |
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nkeynes@359 | 32 | /**
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nkeynes@359 | 33 | * Execute a timeslice using translated code only (ie translate/execute loop)
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nkeynes@359 | 34 | */
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nkeynes@740 | 35 | uint32_t sh4_translate_run_slice( uint32_t nanosecs )
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nkeynes@359 | 36 | {
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nkeynes@408 | 37 | void * (*code)() = NULL;
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nkeynes@1112 | 38 | event_schedule( EVENT_ENDTIMESLICE, nanosecs );
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nkeynes@1112 | 39 | for(;;) {
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nkeynes@736 | 40 | if( sh4r.event_pending <= sh4r.slice_cycle ) {
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nkeynes@736 | 41 | if( sh4r.event_types & PENDING_EVENT ) {
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nkeynes@736 | 42 | event_execute();
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nkeynes@736 | 43 | }
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nkeynes@736 | 44 | /* Eventq execute may (quite likely) deliver an immediate IRQ */
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nkeynes@736 | 45 | if( sh4r.event_types & PENDING_IRQ ) {
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nkeynes@736 | 46 | sh4_accept_interrupt();
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nkeynes@736 | 47 | code = NULL;
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nkeynes@736 | 48 | }
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nkeynes@1112 | 49 | if( sh4r.slice_cycle >= nanosecs )
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nkeynes@1112 | 50 | return nanosecs;
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nkeynes@736 | 51 | }
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nkeynes@359 | 52 |
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nkeynes@1112 | 53 | if( IS_SYSCALL(sh4r.pc) ) {
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nkeynes@1112 | 54 | uint32_t pc = sh4r.pc;
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nkeynes@1112 | 55 | sh4r.pc = sh4r.pr;
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nkeynes@1112 | 56 | sh4r.in_delay_slot = 0;
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nkeynes@1112 | 57 | syscall_invoke( pc );
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nkeynes@1112 | 58 | }
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nkeynes@736 | 59 |
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nkeynes@1112 | 60 | code = xlat_get_code_by_vma( sh4r.pc );
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nkeynes@1112 | 61 | if( code == NULL || sh4r.xlat_sh4_mode != XLAT_BLOCK_MODE(code) ) {
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nkeynes@936 | 62 | code = sh4_translate_basic_block( sh4r.pc );
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nkeynes@736 | 63 | }
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nkeynes@1112 | 64 | code();
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nkeynes@359 | 65 | }
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nkeynes@359 | 66 | }
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nkeynes@359 | 67 |
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nkeynes@359 | 68 | uint8_t *xlat_output;
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nkeynes@596 | 69 | xlat_cache_block_t xlat_current_block;
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nkeynes@586 | 70 | struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
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nkeynes@586 | 71 | uint32_t xlat_recovery_posn;
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nkeynes@359 | 72 |
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nkeynes@596 | 73 | void sh4_translate_add_recovery( uint32_t icount )
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nkeynes@596 | 74 | {
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nkeynes@596 | 75 | xlat_recovery[xlat_recovery_posn].xlat_offset =
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nkeynes@736 | 76 | ((uintptr_t)xlat_output) - ((uintptr_t)xlat_current_block->code);
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nkeynes@596 | 77 | xlat_recovery[xlat_recovery_posn].sh4_icount = icount;
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nkeynes@596 | 78 | xlat_recovery_posn++;
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nkeynes@596 | 79 | }
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nkeynes@596 | 80 |
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nkeynes@359 | 81 | /**
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nkeynes@359 | 82 | * Translate a linear basic block, ie all instructions from the start address
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nkeynes@359 | 83 | * (inclusive) until the next branch/jump instruction or the end of the page
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nkeynes@359 | 84 | * is reached.
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nkeynes@914 | 85 | * @param start VMA of the block start (which must already be in the icache)
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nkeynes@359 | 86 | * @return the address of the translated block
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nkeynes@359 | 87 | * eg due to lack of buffer space.
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nkeynes@359 | 88 | */
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nkeynes@359 | 89 | void * sh4_translate_basic_block( sh4addr_t start )
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nkeynes@359 | 90 | {
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nkeynes@408 | 91 | sh4addr_t pc = start;
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nkeynes@410 | 92 | sh4addr_t lastpc = (pc&0xFFFFF000)+0x1000;
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nkeynes@586 | 93 | int done, i;
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nkeynes@914 | 94 | xlat_current_block = xlat_start_block( GET_ICACHE_PHYS(start) );
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nkeynes@596 | 95 | xlat_output = (uint8_t *)xlat_current_block->code;
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nkeynes@586 | 96 | xlat_recovery_posn = 0;
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nkeynes@596 | 97 | uint8_t *eob = xlat_output + xlat_current_block->size;
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nkeynes@588 | 98 |
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nkeynes@588 | 99 | if( GET_ICACHE_END() < lastpc ) {
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nkeynes@711 | 100 | lastpc = GET_ICACHE_END();
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nkeynes@588 | 101 | }
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nkeynes@588 | 102 |
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nkeynes@408 | 103 | sh4_translate_begin_block(pc);
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nkeynes@359 | 104 |
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nkeynes@408 | 105 | do {
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nkeynes@711 | 106 | if( eob - xlat_output < MAX_INSTRUCTION_SIZE ) {
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nkeynes@711 | 107 | uint8_t *oldstart = xlat_current_block->code;
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nkeynes@711 | 108 | xlat_current_block = xlat_extend_block( xlat_output - oldstart + MAX_INSTRUCTION_SIZE );
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nkeynes@711 | 109 | xlat_output = xlat_current_block->code + (xlat_output - oldstart);
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nkeynes@711 | 110 | eob = xlat_current_block->code + xlat_current_block->size;
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nkeynes@711 | 111 | }
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nkeynes@711 | 112 | done = sh4_translate_instruction( pc );
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nkeynes@711 | 113 | assert( xlat_output <= eob );
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nkeynes@711 | 114 | pc += 2;
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nkeynes@711 | 115 | if ( pc >= lastpc ) {
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nkeynes@711 | 116 | done = 2;
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nkeynes@711 | 117 | }
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nkeynes@1125 | 118 | #ifdef SINGLESTEP
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nkeynes@1125 | 119 | if( !done ) done = 2;
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nkeynes@1125 | 120 | #endif
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nkeynes@408 | 121 | } while( !done );
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nkeynes@408 | 122 | pc += (done - 2);
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nkeynes@617 | 123 |
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nkeynes@617 | 124 | // Add end-of-block recovery for post-instruction checks
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nkeynes@617 | 125 | sh4_translate_add_recovery( (pc - start)>>1 );
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nkeynes@617 | 126 |
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nkeynes@593 | 127 | int epilogue_size = sh4_translate_end_block_size();
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nkeynes@593 | 128 | uint32_t recovery_size = sizeof(struct xlat_recovery_record)*xlat_recovery_posn;
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nkeynes@711 | 129 | uint32_t finalsize = (xlat_output - xlat_current_block->code) + epilogue_size + recovery_size;
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nkeynes@711 | 130 | if( xlat_current_block->size < finalsize ) {
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nkeynes@711 | 131 | uint8_t *oldstart = xlat_current_block->code;
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nkeynes@711 | 132 | xlat_current_block = xlat_extend_block( finalsize );
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nkeynes@711 | 133 | xlat_output = xlat_current_block->code + (xlat_output - oldstart);
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nkeynes@410 | 134 | }
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nkeynes@368 | 135 | sh4_translate_end_block(pc);
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nkeynes@711 | 136 | assert( xlat_output <= (xlat_current_block->code + xlat_current_block->size - recovery_size) );
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nkeynes@736 | 137 |
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nkeynes@586 | 138 | /* Write the recovery records onto the end of the code block */
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nkeynes@586 | 139 | memcpy( xlat_output, xlat_recovery, recovery_size);
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nkeynes@596 | 140 | xlat_current_block->recover_table_offset = xlat_output - (uint8_t *)xlat_current_block->code;
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nkeynes@596 | 141 | xlat_current_block->recover_table_size = xlat_recovery_posn;
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nkeynes@936 | 142 | xlat_current_block->xlat_sh4_mode = sh4r.xlat_sh4_mode;
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nkeynes@586 | 143 | xlat_commit_block( finalsize, pc-start );
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nkeynes@596 | 144 | return xlat_current_block->code;
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nkeynes@359 | 145 | }
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nkeynes@359 | 146 |
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nkeynes@398 | 147 | /**
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nkeynes@586 | 148 | * "Execute" the supplied recovery record. Currently this only updates
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nkeynes@586 | 149 | * sh4r.pc and sh4r.slice_cycle according to the currently executing
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nkeynes@586 | 150 | * instruction. In future this may be more sophisticated (ie will
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nkeynes@586 | 151 | * call into generated code).
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nkeynes@398 | 152 | */
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nkeynes@586 | 153 | void sh4_translate_run_recovery( xlat_recovery_record_t recovery )
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nkeynes@398 | 154 | {
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nkeynes@586 | 155 | sh4r.slice_cycle += (recovery->sh4_icount * sh4_cpu_period);
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nkeynes@586 | 156 | sh4r.pc += (recovery->sh4_icount<<1);
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nkeynes@586 | 157 | }
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nkeynes@359 | 158 |
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nkeynes@941 | 159 | /**
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nkeynes@941 | 160 | * Same as sh4_translate_run_recovery, but is used to recover from a taken
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nkeynes@941 | 161 | * exception - that is, it fixes sh4r.spc rather than sh4r.pc
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nkeynes@941 | 162 | */
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nkeynes@941 | 163 | void sh4_translate_run_exception_recovery( xlat_recovery_record_t recovery )
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nkeynes@941 | 164 | {
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nkeynes@941 | 165 | sh4r.slice_cycle += (recovery->sh4_icount * sh4_cpu_period);
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nkeynes@941 | 166 | sh4r.spc += (recovery->sh4_icount<<1);
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nkeynes@941 | 167 | }
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nkeynes@941 | 168 |
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nkeynes@740 | 169 | void sh4_translate_exit_recover( )
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nkeynes@586 | 170 | {
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nkeynes@906 | 171 | void *code = xlat_get_code_by_vma( sh4r.pc );
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nkeynes@906 | 172 | if( code != NULL ) {
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nkeynes@906 | 173 | uint32_t size = xlat_get_code_size( code );
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nkeynes@906 | 174 | void *pc = xlat_get_native_pc( code, size );
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nkeynes@906 | 175 | if( pc != NULL ) {
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nkeynes@906 | 176 | // could be null if we're not actually running inside the translator
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nkeynes@949 | 177 | xlat_recovery_record_t recover = xlat_get_pre_recovery(code, pc);
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nkeynes@906 | 178 | if( recover != NULL ) {
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nkeynes@906 | 179 | // Can be null if there is no recovery necessary
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nkeynes@906 | 180 | sh4_translate_run_recovery(recover);
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nkeynes@906 | 181 | }
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nkeynes@736 | 182 | }
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nkeynes@398 | 183 | }
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nkeynes@586 | 184 | }
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nkeynes@398 | 185 |
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nkeynes@941 | 186 | void sh4_translate_exception_exit_recover( )
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nkeynes@941 | 187 | {
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nkeynes@941 | 188 | void *code = xlat_get_code_by_vma( sh4r.spc );
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nkeynes@941 | 189 | if( code != NULL ) {
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nkeynes@941 | 190 | uint32_t size = xlat_get_code_size( code );
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nkeynes@941 | 191 | void *pc = xlat_get_native_pc( code, size );
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nkeynes@941 | 192 | if( pc != NULL ) {
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nkeynes@941 | 193 | // could be null if we're not actually running inside the translator
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nkeynes@941 | 194 | xlat_recovery_record_t recover = xlat_get_pre_recovery(code, pc);
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nkeynes@941 | 195 | if( recover != NULL ) {
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nkeynes@941 | 196 | // Can be null if there is no recovery necessary
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nkeynes@941 | 197 | sh4_translate_run_exception_recovery(recover);
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nkeynes@941 | 198 | }
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nkeynes@941 | 199 | }
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nkeynes@941 | 200 | }
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nkeynes@941 | 201 |
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nkeynes@941 | 202 | }
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nkeynes@941 | 203 |
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nkeynes@905 | 204 | void FASTCALL sh4_translate_breakpoint_hit(uint32_t pc)
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nkeynes@591 | 205 | {
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nkeynes@591 | 206 | if( sh4_starting && sh4r.slice_cycle == 0 && pc == sh4r.pc ) {
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nkeynes@736 | 207 | return;
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nkeynes@591 | 208 | }
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nkeynes@740 | 209 | sh4_core_exit( CORE_EXIT_BREAKPOINT );
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nkeynes@591 | 210 | }
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nkeynes@591 | 211 |
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nkeynes@905 | 212 | void * FASTCALL xlat_get_code_by_vma( sh4vma_t vma )
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nkeynes@586 | 213 | {
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nkeynes@586 | 214 | void *result = NULL;
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nkeynes@586 | 215 |
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nkeynes@588 | 216 | if( IS_IN_ICACHE(vma) ) {
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nkeynes@736 | 217 | return xlat_get_code( GET_ICACHE_PHYS(vma) );
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nkeynes@586 | 218 | }
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nkeynes@586 | 219 |
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nkeynes@1014 | 220 | if( IS_SYSCALL(vma) ) {
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nkeynes@736 | 221 | // lxdream hook
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nkeynes@736 | 222 | return NULL;
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nkeynes@588 | 223 | }
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nkeynes@588 | 224 |
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nkeynes@588 | 225 | if( !mmu_update_icache(vma) ) {
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nkeynes@736 | 226 | // fault - off to the fault handler
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nkeynes@736 | 227 | if( !mmu_update_icache(sh4r.pc) ) {
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nkeynes@736 | 228 | // double fault - halt
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nkeynes@736 | 229 | ERROR( "Double fault - halting" );
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nkeynes@740 | 230 | sh4_core_exit(CORE_EXIT_HALT);
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nkeynes@736 | 231 | return NULL;
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nkeynes@736 | 232 | }
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nkeynes@588 | 233 | }
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nkeynes@588 | 234 |
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nkeynes@588 | 235 | assert( IS_IN_ICACHE(sh4r.pc) );
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nkeynes@588 | 236 | result = xlat_get_code( GET_ICACHE_PHYS(sh4r.pc) );
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nkeynes@586 | 237 | return result;
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nkeynes@586 | 238 | }
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nkeynes@586 | 239 |
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nkeynes@1091 | 240 | /**
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nkeynes@1091 | 241 | * Crashdump translation information.
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nkeynes@1091 | 242 | *
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nkeynes@1091 | 243 | * Print out the currently executing block (if any), in source and target
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nkeynes@1091 | 244 | * assembly.
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nkeynes@1091 | 245 | *
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nkeynes@1091 | 246 | * Note: we want to be _really_ careful not to cause a second-level crash
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nkeynes@1091 | 247 | * at this point (e.g. if the lookup tables are corrupted...)
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nkeynes@1091 | 248 | */
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nkeynes@1091 | 249 | void sh4_translate_crashdump()
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nkeynes@1091 | 250 | {
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nkeynes@1091 | 251 | if( !IS_IN_ICACHE(sh4r.pc) ) {
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nkeynes@1091 | 252 | /** If we're crashing due to an icache lookup failure, we'll probably
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nkeynes@1091 | 253 | * hit this case - just complain and return.
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nkeynes@1091 | 254 | */
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nkeynes@1091 | 255 | fprintf( stderr, "** SH4 PC not in current instruction region **\n" );
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nkeynes@1091 | 256 | return;
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nkeynes@1091 | 257 | }
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nkeynes@1091 | 258 | uint32_t pma = GET_ICACHE_PHYS(sh4r.pc);
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nkeynes@1091 | 259 | void *code = xlat_get_code( pma );
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nkeynes@1091 | 260 | if( code == NULL ) {
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nkeynes@1091 | 261 | fprintf( stderr, "** No translated block for current SH4 PC **\n" );
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nkeynes@1091 | 262 | return;
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nkeynes@1091 | 263 | }
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nkeynes@1091 | 264 |
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nkeynes@1091 | 265 | /* Sanity check on the code pointer */
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nkeynes@1091 | 266 | if( !xlat_is_code_pointer(code) ) {
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nkeynes@1091 | 267 | fprintf( stderr, "** Possibly corrupt translation cache **\n" );
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nkeynes@1091 | 268 | return;
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nkeynes@1091 | 269 | }
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nkeynes@1091 | 270 |
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nkeynes@1091 | 271 | void *native_pc = xlat_get_native_pc( code, xlat_get_code_size(code) );
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nkeynes@1091 | 272 | sh4_translate_disasm_block( stderr, code, sh4r.pc, native_pc );
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nkeynes@1091 | 273 | }
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nkeynes@1094 | 274 |
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nkeynes@1094 | 275 | /**
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nkeynes@1094 | 276 | * Dual-dump the translated block and original SH4 code for the basic block
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nkeynes@1094 | 277 | * starting at sh4_pc. If there is no translated block, this prints an error
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nkeynes@1094 | 278 | * and returns.
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nkeynes@1094 | 279 | */
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nkeynes@1094 | 280 | void sh4_translate_dump_block( uint32_t sh4_pc )
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nkeynes@1094 | 281 | {
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nkeynes@1094 | 282 | if( !IS_IN_ICACHE(sh4_pc) ) {
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nkeynes@1094 | 283 | fprintf( stderr, "** Address %08x not in current instruction region **\n", sh4_pc );
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nkeynes@1094 | 284 | return;
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nkeynes@1094 | 285 | }
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nkeynes@1094 | 286 | uint32_t pma = GET_ICACHE_PHYS(sh4_pc);
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nkeynes@1094 | 287 | void *code = xlat_get_code( pma );
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nkeynes@1094 | 288 | if( code == NULL ) {
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nkeynes@1094 | 289 | fprintf( stderr, "** No translated block for address %08x **\n", sh4_pc );
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nkeynes@1094 | 290 | return;
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nkeynes@1094 | 291 | }
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nkeynes@1094 | 292 | sh4_translate_disasm_block( stderr, code, sh4_pc, NULL );
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nkeynes@1094 | 293 | }
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nkeynes@1094 | 294 |
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