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@359 | 29 |
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nkeynes@359 | 30 | /**
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nkeynes@359 | 31 | * Execute a timeslice using translated code only (ie translate/execute loop)
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nkeynes@359 | 32 | */
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nkeynes@740 | 33 | uint32_t sh4_translate_run_slice( uint32_t nanosecs )
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nkeynes@359 | 34 | {
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nkeynes@408 | 35 | void * (*code)() = NULL;
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nkeynes@368 | 36 | while( sh4r.slice_cycle < nanosecs ) {
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nkeynes@736 | 37 | if( sh4r.event_pending <= sh4r.slice_cycle ) {
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nkeynes@736 | 38 | if( sh4r.event_types & PENDING_EVENT ) {
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nkeynes@736 | 39 | event_execute();
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nkeynes@736 | 40 | }
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nkeynes@736 | 41 | /* Eventq execute may (quite likely) deliver an immediate IRQ */
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nkeynes@736 | 42 | if( sh4r.event_types & PENDING_IRQ ) {
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nkeynes@736 | 43 | sh4_accept_interrupt();
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nkeynes@736 | 44 | code = NULL;
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nkeynes@736 | 45 | }
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nkeynes@736 | 46 | }
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nkeynes@359 | 47 |
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nkeynes@736 | 48 | if( code == NULL ) {
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nkeynes@736 | 49 | if( sh4r.pc > 0xFFFFFF00 ) {
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nkeynes@736 | 50 | syscall_invoke( sh4r.pc );
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nkeynes@736 | 51 | sh4r.in_delay_slot = 0;
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nkeynes@736 | 52 | sh4r.pc = sh4r.pr;
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nkeynes@736 | 53 | }
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nkeynes@736 | 54 |
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nkeynes@736 | 55 | code = xlat_get_code_by_vma( sh4r.pc );
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nkeynes@953 | 56 | if( code == NULL || sh4r.xlat_sh4_mode != XLAT_BLOCK_MODE(code) ) {
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nkeynes@736 | 57 | code = sh4_translate_basic_block( sh4r.pc );
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nkeynes@736 | 58 | }
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nkeynes@953 | 59 | } else if( sh4r.xlat_sh4_mode != XLAT_BLOCK_MODE(code) ) {
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nkeynes@954 | 60 | if( !IS_IN_ICACHE(sh4r.pc) ) {
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nkeynes@954 | 61 | /* If TLB is off, we may have gotten here without updating
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nkeynes@954 | 62 | * the icache, so do it now. This should never fail, so...
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nkeynes@954 | 63 | */
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nkeynes@954 | 64 | mmu_update_icache(sh4r.pc);
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nkeynes@954 | 65 | assert( IS_IN_ICACHE(sh4r.pc) );
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nkeynes@954 | 66 | }
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nkeynes@953 | 67 | code = sh4_translate_basic_block( sh4r.pc );
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nkeynes@736 | 68 | }
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nkeynes@736 | 69 | code = code();
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nkeynes@359 | 70 | }
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nkeynes@359 | 71 | return nanosecs;
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nkeynes@359 | 72 | }
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nkeynes@359 | 73 |
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nkeynes@359 | 74 | uint8_t *xlat_output;
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nkeynes@596 | 75 | xlat_cache_block_t xlat_current_block;
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nkeynes@586 | 76 | struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
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nkeynes@586 | 77 | uint32_t xlat_recovery_posn;
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nkeynes@359 | 78 |
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nkeynes@596 | 79 | void sh4_translate_add_recovery( uint32_t icount )
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nkeynes@596 | 80 | {
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nkeynes@596 | 81 | xlat_recovery[xlat_recovery_posn].xlat_offset =
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nkeynes@736 | 82 | ((uintptr_t)xlat_output) - ((uintptr_t)xlat_current_block->code);
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nkeynes@596 | 83 | xlat_recovery[xlat_recovery_posn].sh4_icount = icount;
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nkeynes@596 | 84 | xlat_recovery_posn++;
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nkeynes@596 | 85 | }
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nkeynes@596 | 86 |
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nkeynes@359 | 87 | /**
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nkeynes@359 | 88 | * Translate a linear basic block, ie all instructions from the start address
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nkeynes@359 | 89 | * (inclusive) until the next branch/jump instruction or the end of the page
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nkeynes@359 | 90 | * is reached.
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nkeynes@914 | 91 | * @param start VMA of the block start (which must already be in the icache)
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nkeynes@359 | 92 | * @return the address of the translated block
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nkeynes@359 | 93 | * eg due to lack of buffer space.
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nkeynes@359 | 94 | */
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nkeynes@359 | 95 | void * sh4_translate_basic_block( sh4addr_t start )
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nkeynes@359 | 96 | {
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nkeynes@408 | 97 | sh4addr_t pc = start;
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nkeynes@410 | 98 | sh4addr_t lastpc = (pc&0xFFFFF000)+0x1000;
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nkeynes@586 | 99 | int done, i;
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nkeynes@914 | 100 | xlat_current_block = xlat_start_block( GET_ICACHE_PHYS(start) );
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nkeynes@596 | 101 | xlat_output = (uint8_t *)xlat_current_block->code;
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nkeynes@586 | 102 | xlat_recovery_posn = 0;
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nkeynes@596 | 103 | uint8_t *eob = xlat_output + xlat_current_block->size;
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nkeynes@588 | 104 |
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nkeynes@588 | 105 | if( GET_ICACHE_END() < lastpc ) {
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nkeynes@711 | 106 | lastpc = GET_ICACHE_END();
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nkeynes@588 | 107 | }
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nkeynes@588 | 108 |
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nkeynes@408 | 109 | sh4_translate_begin_block(pc);
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nkeynes@359 | 110 |
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nkeynes@408 | 111 | do {
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nkeynes@711 | 112 | if( eob - xlat_output < MAX_INSTRUCTION_SIZE ) {
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nkeynes@711 | 113 | uint8_t *oldstart = xlat_current_block->code;
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nkeynes@711 | 114 | xlat_current_block = xlat_extend_block( xlat_output - oldstart + MAX_INSTRUCTION_SIZE );
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nkeynes@711 | 115 | xlat_output = xlat_current_block->code + (xlat_output - oldstart);
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nkeynes@711 | 116 | eob = xlat_current_block->code + xlat_current_block->size;
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nkeynes@711 | 117 | }
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nkeynes@711 | 118 | done = sh4_translate_instruction( pc );
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nkeynes@711 | 119 | assert( xlat_output <= eob );
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nkeynes@711 | 120 | pc += 2;
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nkeynes@711 | 121 | if ( pc >= lastpc ) {
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nkeynes@711 | 122 | done = 2;
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nkeynes@711 | 123 | }
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nkeynes@408 | 124 | } while( !done );
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nkeynes@408 | 125 | pc += (done - 2);
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nkeynes@617 | 126 |
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nkeynes@617 | 127 | // Add end-of-block recovery for post-instruction checks
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nkeynes@617 | 128 | sh4_translate_add_recovery( (pc - start)>>1 );
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nkeynes@617 | 129 |
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nkeynes@593 | 130 | int epilogue_size = sh4_translate_end_block_size();
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nkeynes@593 | 131 | uint32_t recovery_size = sizeof(struct xlat_recovery_record)*xlat_recovery_posn;
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nkeynes@711 | 132 | uint32_t finalsize = (xlat_output - xlat_current_block->code) + epilogue_size + recovery_size;
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nkeynes@711 | 133 | if( xlat_current_block->size < finalsize ) {
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nkeynes@711 | 134 | uint8_t *oldstart = xlat_current_block->code;
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nkeynes@711 | 135 | xlat_current_block = xlat_extend_block( finalsize );
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nkeynes@711 | 136 | xlat_output = xlat_current_block->code + (xlat_output - oldstart);
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nkeynes@410 | 137 | }
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nkeynes@368 | 138 | sh4_translate_end_block(pc);
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nkeynes@711 | 139 | assert( xlat_output <= (xlat_current_block->code + xlat_current_block->size - recovery_size) );
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nkeynes@736 | 140 |
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nkeynes@586 | 141 | /* Write the recovery records onto the end of the code block */
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nkeynes@586 | 142 | memcpy( xlat_output, xlat_recovery, recovery_size);
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nkeynes@596 | 143 | xlat_current_block->recover_table_offset = xlat_output - (uint8_t *)xlat_current_block->code;
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nkeynes@596 | 144 | xlat_current_block->recover_table_size = xlat_recovery_posn;
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nkeynes@953 | 145 | xlat_current_block->xlat_sh4_mode = sh4r.xlat_sh4_mode;
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nkeynes@586 | 146 | xlat_commit_block( finalsize, pc-start );
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nkeynes@596 | 147 | return xlat_current_block->code;
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nkeynes@359 | 148 | }
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nkeynes@359 | 149 |
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nkeynes@398 | 150 | /**
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nkeynes@586 | 151 | * "Execute" the supplied recovery record. Currently this only updates
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nkeynes@586 | 152 | * sh4r.pc and sh4r.slice_cycle according to the currently executing
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nkeynes@586 | 153 | * instruction. In future this may be more sophisticated (ie will
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nkeynes@586 | 154 | * call into generated code).
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nkeynes@398 | 155 | */
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nkeynes@586 | 156 | void sh4_translate_run_recovery( xlat_recovery_record_t recovery )
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nkeynes@398 | 157 | {
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nkeynes@586 | 158 | sh4r.slice_cycle += (recovery->sh4_icount * sh4_cpu_period);
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nkeynes@586 | 159 | sh4r.pc += (recovery->sh4_icount<<1);
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nkeynes@586 | 160 | }
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nkeynes@359 | 161 |
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nkeynes@953 | 162 | /**
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nkeynes@953 | 163 | * Same as sh4_translate_run_recovery, but is used to recover from a taken
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nkeynes@953 | 164 | * exception - that is, it fixes sh4r.spc rather than sh4r.pc
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nkeynes@953 | 165 | */
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nkeynes@953 | 166 | void sh4_translate_run_exception_recovery( xlat_recovery_record_t recovery )
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nkeynes@953 | 167 | {
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nkeynes@953 | 168 | sh4r.slice_cycle += (recovery->sh4_icount * sh4_cpu_period);
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nkeynes@953 | 169 | sh4r.spc += (recovery->sh4_icount<<1);
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nkeynes@953 | 170 | }
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nkeynes@953 | 171 |
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nkeynes@740 | 172 | void sh4_translate_exit_recover( )
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nkeynes@586 | 173 | {
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nkeynes@906 | 174 | void *code = xlat_get_code_by_vma( sh4r.pc );
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nkeynes@906 | 175 | if( code != NULL ) {
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nkeynes@906 | 176 | uint32_t size = xlat_get_code_size( code );
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nkeynes@906 | 177 | void *pc = xlat_get_native_pc( code, size );
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nkeynes@906 | 178 | if( pc != NULL ) {
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nkeynes@906 | 179 | // could be null if we're not actually running inside the translator
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nkeynes@953 | 180 | xlat_recovery_record_t recover = xlat_get_pre_recovery(code, pc);
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nkeynes@906 | 181 | if( recover != NULL ) {
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nkeynes@906 | 182 | // Can be null if there is no recovery necessary
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nkeynes@906 | 183 | sh4_translate_run_recovery(recover);
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nkeynes@906 | 184 | }
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nkeynes@736 | 185 | }
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nkeynes@398 | 186 | }
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nkeynes@586 | 187 | }
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nkeynes@398 | 188 |
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nkeynes@953 | 189 | void sh4_translate_exception_exit_recover( )
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nkeynes@953 | 190 | {
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nkeynes@953 | 191 | void *code = xlat_get_code_by_vma( sh4r.spc );
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nkeynes@953 | 192 | if( code != NULL ) {
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nkeynes@953 | 193 | uint32_t size = xlat_get_code_size( code );
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nkeynes@953 | 194 | void *pc = xlat_get_native_pc( code, size );
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nkeynes@953 | 195 | if( pc != NULL ) {
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nkeynes@953 | 196 | // could be null if we're not actually running inside the translator
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nkeynes@953 | 197 | xlat_recovery_record_t recover = xlat_get_pre_recovery(code, pc);
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nkeynes@953 | 198 | if( recover != NULL ) {
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nkeynes@953 | 199 | // Can be null if there is no recovery necessary
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nkeynes@953 | 200 | sh4_translate_run_exception_recovery(recover);
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nkeynes@953 | 201 | }
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nkeynes@953 | 202 | }
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nkeynes@953 | 203 | }
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nkeynes@953 | 204 |
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nkeynes@953 | 205 | }
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nkeynes@953 | 206 |
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nkeynes@905 | 207 | void FASTCALL sh4_translate_breakpoint_hit(uint32_t pc)
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nkeynes@591 | 208 | {
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nkeynes@591 | 209 | if( sh4_starting && sh4r.slice_cycle == 0 && pc == sh4r.pc ) {
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nkeynes@736 | 210 | return;
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nkeynes@591 | 211 | }
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nkeynes@740 | 212 | sh4_core_exit( CORE_EXIT_BREAKPOINT );
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nkeynes@591 | 213 | }
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nkeynes@591 | 214 |
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nkeynes@905 | 215 | void * FASTCALL xlat_get_code_by_vma( sh4vma_t vma )
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nkeynes@586 | 216 | {
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nkeynes@586 | 217 | void *result = NULL;
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nkeynes@586 | 218 |
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nkeynes@588 | 219 | if( IS_IN_ICACHE(vma) ) {
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nkeynes@736 | 220 | return xlat_get_code( GET_ICACHE_PHYS(vma) );
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nkeynes@586 | 221 | }
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nkeynes@586 | 222 |
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nkeynes@588 | 223 | if( vma > 0xFFFFFF00 ) {
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nkeynes@736 | 224 | // lxdream hook
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nkeynes@736 | 225 | return NULL;
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nkeynes@588 | 226 | }
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nkeynes@588 | 227 |
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nkeynes@588 | 228 | if( !mmu_update_icache(vma) ) {
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nkeynes@736 | 229 | // fault - off to the fault handler
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nkeynes@736 | 230 | if( !mmu_update_icache(sh4r.pc) ) {
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nkeynes@736 | 231 | // double fault - halt
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nkeynes@736 | 232 | ERROR( "Double fault - halting" );
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nkeynes@740 | 233 | sh4_core_exit(CORE_EXIT_HALT);
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nkeynes@736 | 234 | return NULL;
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nkeynes@736 | 235 | }
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nkeynes@588 | 236 | }
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nkeynes@588 | 237 |
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nkeynes@588 | 238 | assert( IS_IN_ICACHE(sh4r.pc) );
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nkeynes@588 | 239 | result = xlat_get_code( GET_ICACHE_PHYS(sh4r.pc) );
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nkeynes@586 | 240 | return result;
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nkeynes@586 | 241 | }
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nkeynes@586 | 242 |
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