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annotate backend.h @ 567:8e395210f50f

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Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
author Michael Pavone <pavone@retrodev.com>
date Sun, 02 Mar 2014 14:45:36 -0800
parents c8fefa140c80
children c05fcbfe1b1a
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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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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
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16 typedef struct {
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17 int32_t disp;
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18 uint8_t mode;
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19 uint8_t base;
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20 uint8_t index;
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21 uint8_t cycles;
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22 } x86_ea;
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23
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24 typedef struct {
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25 uint8_t *base;
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26 int32_t *offsets;
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27 } native_map_slot;
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28
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29 typedef struct deferred_addr {
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30 struct deferred_addr *next;
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31 code_ptr dest;
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32 uint32_t address;
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33 } deferred_addr;
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34
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35 typedef enum {
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36 READ_16,
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37 READ_8,
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38 WRITE_16,
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39 WRITE_8
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40 } ftype;
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42 typedef struct {
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43 uint32_t flags;
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44 native_map_slot *native_code_map;
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45 deferred_addr *deferred;
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46 code_info code;
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47 uint8_t **ram_inst_sizes;
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48 code_ptr save_context;
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49 code_ptr load_context;
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50 code_ptr handle_cycle_limit;
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51 code_ptr handle_cycle_limit_int;
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52 uint8_t context_reg;
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53 uint8_t cycles;
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54 uint8_t limit;
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55 uint8_t scratch1;
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56 uint8_t scratch2;
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57 } cpu_options;
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60 #define MMAP_READ 0x01
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61 #define MMAP_WRITE 0x02
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62 #define MMAP_CODE 0x04
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63 #define MMAP_PTR_IDX 0x08
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64 #define MMAP_ONLY_ODD 0x10
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65 #define MMAP_ONLY_EVEN 0x20
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66 #define MMAP_FUNC_NULL 0x40
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68 typedef uint16_t (*read_16_fun)(uint32_t address, void * context);
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69 typedef uint8_t (*read_8_fun)(uint32_t address, void * context);
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70 typedef void * (*write_16_fun)(uint32_t address, void * context, uint16_t value);
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71 typedef void * (*write_8_fun)(uint32_t address, void * context, uint8_t value);
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72
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73 typedef struct {
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74 uint32_t start;
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75 uint32_t end;
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76 uint32_t mask;
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77 uint16_t ptr_index;
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78 uint16_t flags;
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79 void * buffer;
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80 read_16_fun read_16;
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81 write_16_fun write_16;
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82 read_8_fun read_8;
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83 write_8_fun write_8;
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84 } memmap_chunk;
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85
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86 typedef uint8_t * (*native_addr_func)(void * context, uint32_t address);
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87
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88 deferred_addr * defer_address(deferred_addr * old_head, uint32_t address, uint8_t *dest);
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89 void remove_deferred_until(deferred_addr **head_ptr, deferred_addr * remove_to);
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90 void process_deferred(deferred_addr ** head_ptr, void * context, native_addr_func get_native);
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91
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92 void cycles(cpu_options *opts, uint32_t num);
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93 void check_cycles_int(cpu_options *opts, uint32_t address);
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94 void check_cycles(cpu_options * opts);
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96 #endif //BACKEND_H_
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97