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annotate backend.h @ 2224:d8b0244101c4

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Fix bad 68K instruction timings revealed by Ti_'s test ROM, except those that involve exception timing
author Michael Pavone <pavone@retrodev.com>
date Mon, 05 Sep 2022 00:49:03 -0700
parents 8554751f17b5
children bf4f1a8d1d48
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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 #ifndef BACKEND_H_
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7 #define BACKEND_H_
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8
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9 #include <stdint.h>
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10 #include <stdio.h>
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11 #include "gen.h"
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12
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13 #define INVALID_OFFSET 0xFFFFFFFF
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14 #define EXTENSION_WORD 0xFFFFFFFE
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15 #define CYCLE_NEVER 0xFFFFFFFF
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16
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17 #if defined(X86_32) || defined(X86_64)
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18 typedef struct {
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19 int32_t disp;
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20 uint8_t mode;
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21 uint8_t base;
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22 uint8_t index;
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23 } host_ea;
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24 #else
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25 typedef struct {
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26 int32_t disp;
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27 uint8_t mode;
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28 uint8_t base;
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29 } host_ea;
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30 #endif
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32 typedef struct {
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33 uint8_t *base;
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34 int32_t *offsets;
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35 } native_map_slot;
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36
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37 typedef struct deferred_addr {
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38 struct deferred_addr *next;
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39 code_ptr dest;
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40 uint32_t address;
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41 } deferred_addr;
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42
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43 #include "memmap.h"
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44 #include "system.h"
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45
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46 typedef struct {
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47 uint32_t flags;
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48 native_map_slot *native_code_map;
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49 deferred_addr *deferred;
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50 code_info code;
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51 uint8_t **ram_inst_sizes;
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52 memmap_chunk const *memmap;
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53 code_ptr save_context;
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54 code_ptr load_context;
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55 code_ptr handle_cycle_limit;
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56 code_ptr handle_cycle_limit_int;
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57 code_ptr handle_code_write;
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58 code_ptr handle_align_error_write;
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59 code_ptr handle_align_error_read;
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60 system_str_fun_r8 debug_cmd_handler;
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61 uint32_t memmap_chunks;
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62 uint32_t address_mask;
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63 uint32_t max_address;
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64 uint32_t bus_cycles;
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65 uint32_t clock_divider;
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66 uint32_t move_pc_off;
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67 uint32_t move_pc_size;
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68 int32_t mem_ptr_off;
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69 int32_t ram_flags_off;
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70 uint8_t ram_flags_shift;
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71 uint8_t address_size;
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72 uint8_t byte_swap;
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73 int8_t context_reg;
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74 int8_t cycles;
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75 int8_t limit;
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76 int8_t scratch1;
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77 int8_t scratch2;
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78 uint8_t align_error_mask;
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79 } cpu_options;
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80
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81 typedef uint8_t * (*native_addr_func)(void * context, uint32_t address);
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82
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83 deferred_addr * defer_address(deferred_addr * old_head, uint32_t address, uint8_t *dest);
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84 void remove_deferred_until(deferred_addr **head_ptr, deferred_addr * remove_to);
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85 void process_deferred(deferred_addr ** head_ptr, void * context, native_addr_func get_native);
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86
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87 void cycles(cpu_options *opts, uint32_t num);
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88 void check_cycles_int(cpu_options *opts, uint32_t address);
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89 void check_cycles(cpu_options * opts);
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90 void check_code_prologue(code_info *code);
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91 void log_address(cpu_options *opts, uint32_t address, char * format);
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92
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93 void retranslate_calc(cpu_options *opts);
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94 void patch_for_retranslate(cpu_options *opts, code_ptr native_address, code_ptr handler);
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95 void defer_translation(cpu_options *opts, uint32_t address, code_ptr handler);
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96
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97 code_ptr gen_mem_fun(cpu_options * opts, memmap_chunk const * memmap, uint32_t num_chunks, ftype fun_type, code_ptr *after_inc);
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98 void * get_native_pointer(uint32_t address, void ** mem_pointers, cpu_options * opts);
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99 void * get_native_write_pointer(uint32_t address, void ** mem_pointers, cpu_options * opts);
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100 uint16_t read_word(uint32_t address, void **mem_pointers, cpu_options *opts, void *context);
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101 void write_word(uint32_t address, uint16_t value, void **mem_pointers, cpu_options *opts, void *context);
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102 uint8_t read_byte(uint32_t address, void **mem_pointers, cpu_options *opts, void *context);
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103 void write_byte(uint32_t address, uint8_t value, void **mem_pointers, cpu_options *opts, void *context);
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104 memmap_chunk const *find_map_chunk(uint32_t address, cpu_options *opts, uint16_t flags, uint32_t *size_sum);
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105 uint32_t chunk_size(cpu_options *opts, memmap_chunk const *chunk);
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106 uint32_t ram_size(cpu_options *opts);
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107
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108 #endif //BACKEND_H_
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109