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annotate backend.c @ 1771:e59045f781ce mame_interp

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Fix a couple issues in manual memory map read/write functions
author Michael Pavone <pavone@retrodev.com>
date Tue, 12 Mar 2019 21:57:35 -0700
parents 8fe162bdb038
children 374a5ae694e8
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1 /*
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2 Copyright 2013 Michael Pavone
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3 This file is part of BlastEm.
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
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5 */
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6 #include "backend.h"
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7 #include <stdlib.h>
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8
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9 #ifdef USE_NATIVE
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10 deferred_addr * defer_address(deferred_addr * old_head, uint32_t address, uint8_t *dest)
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11 {
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12 deferred_addr * new_head = malloc(sizeof(deferred_addr));
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13 new_head->next = old_head;
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14 new_head->address = address & 0xFFFFFF;
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15 new_head->dest = dest;
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16 return new_head;
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17 }
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18
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19 void remove_deferred_until(deferred_addr **head_ptr, deferred_addr * remove_to)
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20 {
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21 for(deferred_addr *cur = *head_ptr; cur && cur != remove_to; cur = *head_ptr)
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22 {
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23 *head_ptr = cur->next;
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24 free(cur);
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25 }
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26 }
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27
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28 void process_deferred(deferred_addr ** head_ptr, void * context, native_addr_func get_native)
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29 {
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30 deferred_addr * cur = *head_ptr;
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31 deferred_addr **last_next = head_ptr;
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32 while(cur)
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33 {
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34 code_ptr native = get_native(context, cur->address);//get_native_address(opts->native_code_map, cur->address);
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35 if (native) {
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36 int32_t disp = native - (cur->dest + 4);
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37 code_ptr out = cur->dest;
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38 *(out++) = disp;
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39 disp >>= 8;
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40 *(out++) = disp;
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41 disp >>= 8;
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42 *(out++) = disp;
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43 disp >>= 8;
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44 *out = disp;
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45 *last_next = cur->next;
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46 free(cur);
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47 cur = *last_next;
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48 } else {
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49 last_next = &(cur->next);
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50 cur = cur->next;
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51 }
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52 }
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53 }
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54 #endif
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55
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56 memmap_chunk const *find_map_chunk(uint32_t address, cpu_options *opts, uint16_t flags, uint32_t *size_sum)
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57 {
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58 if (size_sum) {
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59 *size_sum = 0;
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60 }
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61 address &= opts->address_mask;
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62 for (memmap_chunk const *cur = opts->memmap, *end = opts->memmap + opts->memmap_chunks; cur != end; cur++)
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63 {
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64 if (address >= cur->start && address < cur->end) {
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65 return cur;
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66 } else if (size_sum && (cur->flags & flags) == flags) {
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67 *size_sum += chunk_size(opts, cur);
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68 }
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69 }
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70 return NULL;
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71 }
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72
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73 void * get_native_pointer(uint32_t address, void ** mem_pointers, cpu_options * opts)
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74 {
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75 memmap_chunk const * memmap = opts->memmap;
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76 address &= opts->address_mask;
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77 for (uint32_t chunk = 0; chunk < opts->memmap_chunks; chunk++)
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78 {
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79 if (address >= memmap[chunk].start && address < memmap[chunk].end) {
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80 if (!(memmap[chunk].flags & (MMAP_READ|MMAP_READ_CODE))) {
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81 return NULL;
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82 }
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83 uint8_t * base = memmap[chunk].flags & MMAP_PTR_IDX
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84 ? mem_pointers[memmap[chunk].ptr_index]
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85 : memmap[chunk].buffer;
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86 if (!base) {
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87 if (memmap[chunk].flags & MMAP_AUX_BUFF) {
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88 return memmap[chunk].buffer + (address & memmap[chunk].aux_mask);
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89 }
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90 return NULL;
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91 }
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92 return base + (address & memmap[chunk].mask);
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93 }
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94 }
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95 return NULL;
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96 }
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98 void * get_native_write_pointer(uint32_t address, void ** mem_pointers, cpu_options * opts)
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99 {
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100 memmap_chunk const * memmap = opts->memmap;
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101 address &= opts->address_mask;
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102 for (uint32_t chunk = 0; chunk < opts->memmap_chunks; chunk++)
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103 {
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104 if (address >= memmap[chunk].start && address < memmap[chunk].end) {
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105 if (!(memmap[chunk].flags & (MMAP_WRITE))) {
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106 return NULL;
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107 }
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108 uint8_t * base = memmap[chunk].flags & MMAP_PTR_IDX
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109 ? mem_pointers[memmap[chunk].ptr_index]
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110 : memmap[chunk].buffer;
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111 if (!base) {
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112 if (memmap[chunk].flags & MMAP_AUX_BUFF) {
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113 return memmap[chunk].buffer + (address & memmap[chunk].aux_mask);
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114 }
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115 return NULL;
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116 }
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117 return base + (address & memmap[chunk].mask);
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118 }
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119 }
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120 return NULL;
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121 }
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122
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123 uint16_t read_word(uint32_t address, void **mem_pointers, cpu_options *opts, void *context)
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124 {
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parents: 1142
diff changeset
125 memmap_chunk const *chunk = find_map_chunk(address, opts, 0, NULL);
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
126 if (!chunk) {
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
127 return 0xFFFF;
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
128 }
1678
d377d6037dd9 Don't subtract chunk start from address in read_word as this is inconsistent with other consumers of memory map definitions. Fixes graphical corruption in NBA Jam TE and possibly other titles that use the Acclaim mapper with a 32Mbit ROM
Michael Pavone <pavone@retrodev.com>
parents: 1519
diff changeset
129 uint32_t offset = address & chunk->mask;
1313
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
130 if (chunk->flags & MMAP_READ) {
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
131 uint8_t *base;
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
132 if (chunk->flags & MMAP_PTR_IDX) {
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
133 base = mem_pointers[chunk->ptr_index];
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
134 } else {
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
135 base = chunk->buffer;
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
136 }
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
137 if (base) {
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
138 uint16_t val;
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
139 if ((chunk->flags & MMAP_ONLY_ODD) || (chunk->flags & MMAP_ONLY_EVEN)) {
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
140 offset /= 2;
1419
92e7dafcc0dc Fix a silly variable shadowing bug in read_word
Michael Pavone <pavone@retrodev.com>
parents: 1313
diff changeset
141 val = base[offset];
1313
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
142 if (chunk->flags & MMAP_ONLY_ODD) {
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
143 val |= 0xFF00;
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
144 } else {
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
145 val = val << 8 | 0xFF;
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
146 }
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
147 } else {
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
148 val = *(uint16_t *)(base + offset);
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
149 }
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
150 return val;
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
151 }
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
152 }
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
153 if ((!(chunk->flags & MMAP_READ) || (chunk->flags & MMAP_FUNC_NULL)) && chunk->read_16) {
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
154 return chunk->read_16(offset, context);
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
155 }
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
156 return 0xFFFF;
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
157 }
b27d7bf1107e Improved printing of word at absolute address to support reading from all address types. Implemented support for printing the value pointed to by a register. Removed abuse of read_dma_value in internal debugger.
Michael Pavone <pavone@retrodev.com>
parents: 1142
diff changeset
158
1506
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
159 void write_word(uint32_t address, uint16_t value, void **mem_pointers, cpu_options *opts, void *context)
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
160 {
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
161 memmap_chunk const *chunk = find_map_chunk(address, opts, 0, NULL);
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
162 if (!chunk) {
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
163 return;
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
164 }
1771
e59045f781ce Fix a couple issues in manual memory map read/write functions
Michael Pavone <pavone@retrodev.com>
parents: 1769
diff changeset
165 uint32_t offset = address & chunk->mask;
1506
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
166 if (chunk->flags & MMAP_WRITE) {
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
167 uint8_t *base;
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
168 if (chunk->flags & MMAP_PTR_IDX) {
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
169 base = mem_pointers[chunk->ptr_index];
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
170 } else {
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
171 base = chunk->buffer;
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
172 }
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
173 if (base) {
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
174 if ((chunk->flags & MMAP_ONLY_ODD) || (chunk->flags & MMAP_ONLY_EVEN)) {
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
175 offset /= 2;
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
176 if (chunk->flags & MMAP_ONLY_EVEN) {
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
177 value >>= 16;
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
178 }
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
179 base[offset] = value;
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
180 } else {
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
181 *(uint16_t *)(base + offset) = value;
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
182 }
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
183 return;
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
184 }
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
185 }
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
186 if ((!(chunk->flags & MMAP_WRITE) || (chunk->flags & MMAP_FUNC_NULL)) && chunk->write_16) {
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
187 chunk->write_16(offset, context, value);
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
188 }
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
189 }
ded16f3d7eb4 Super hacky integration of the version of Musashi from MAME
Michael Pavone <pavone@retrodev.com>
parents: 1419
diff changeset
190
1703
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
191 uint8_t read_byte(uint32_t address, void **mem_pointers, cpu_options *opts, void *context)
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
192 {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
193 memmap_chunk const *chunk = find_map_chunk(address, opts, 0, NULL);
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
194 if (!chunk) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
195 return 0xFF;
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
196 }
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
197 uint32_t offset = address & chunk->mask;
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
198 if (chunk->flags & MMAP_READ) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
199 uint8_t *base;
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
200 if (chunk->flags & MMAP_PTR_IDX) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
201 base = mem_pointers[chunk->ptr_index];
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
202 } else {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
203 base = chunk->buffer;
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
204 }
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
205 if (base) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
206 if ((chunk->flags & MMAP_ONLY_ODD) || (chunk->flags & MMAP_ONLY_EVEN)) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
207 if (address & 1) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
208 if (chunk->flags & MMAP_ONLY_EVEN) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
209 return 0xFF;
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
210 }
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
211 } else if (chunk->flags & MMAP_ONLY_ODD) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
212 return 0xFF;
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
213 }
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
214 offset /= 2;
1771
e59045f781ce Fix a couple issues in manual memory map read/write functions
Michael Pavone <pavone@retrodev.com>
parents: 1769
diff changeset
215 } else if(opts->byte_swap) {
e59045f781ce Fix a couple issues in manual memory map read/write functions
Michael Pavone <pavone@retrodev.com>
parents: 1769
diff changeset
216 offset ^= 1;
1703
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
217 }
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
218 return base[offset];
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
219 }
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
220 }
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
221 if ((!(chunk->flags & MMAP_READ) || (chunk->flags & MMAP_FUNC_NULL)) && chunk->read_8) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
222 return chunk->read_8(offset, context);
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
223 }
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
224 return 0xFF;
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
225 }
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
226
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
227 void write_byte(uint32_t address, uint8_t value, void **mem_pointers, cpu_options *opts, void *context)
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
228 {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
229 memmap_chunk const *chunk = find_map_chunk(address, opts, 0, NULL);
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
230 if (!chunk) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
231 return;
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
232 }
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
233 uint32_t offset = address & chunk->mask;
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
234 if (chunk->flags & MMAP_WRITE) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
235 uint8_t *base;
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
236 if (chunk->flags & MMAP_PTR_IDX) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
237 base = mem_pointers[chunk->ptr_index];
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
238 } else {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
239 base = chunk->buffer;
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
240 }
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
241 if (base) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
242 if ((chunk->flags & MMAP_ONLY_ODD) || (chunk->flags & MMAP_ONLY_EVEN)) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
243 if (address & 1) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
244 if (chunk->flags & MMAP_ONLY_EVEN) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
245 return;
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
246 }
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
247 } else if (chunk->flags & MMAP_ONLY_ODD) {
49a52c737bf0 Fix zero flag calculation in CPU DSL
Michael Pavone <pavone@retrodev.com>
parents: 1678
diff changeset
248 return;
49a52c737bf0 Fix zero flag calculation in CPU DSL
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249 }
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250 offset /= 2;
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251 } else if(opts->byte_swap) {
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252 offset ^= 1;
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253 }
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254 base[offset] = value;
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255 }
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256 }
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257 if ((!(chunk->flags & MMAP_WRITE) || (chunk->flags & MMAP_FUNC_NULL)) && chunk->write_8) {
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258 chunk->write_8(offset, context, value);
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259 }
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260 }
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261
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262 uint32_t chunk_size(cpu_options *opts, memmap_chunk const *chunk)
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263 {
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264 if (chunk->mask == opts->address_mask) {
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265 return chunk->end - chunk->start;
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266 } else {
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267 return chunk->mask + 1;
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268 }
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269 }
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270
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271 uint32_t ram_size(cpu_options *opts)
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272 {
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273 uint32_t size = 0;
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274 for (int i = 0; i < opts->memmap_chunks; i++)
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275 {
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276 if (opts->memmap[i].flags & MMAP_CODE) {
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277 if (opts->memmap[i].mask == opts->address_mask) {
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278 size += opts->memmap[i].end - opts->memmap[i].start;
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279 } else {
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280 size += opts->memmap[i].mask + 1;
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281 }
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282 }
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283 }
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284 return size;
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285 }