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Diffstat (limited to 'backend.h')
| -rw-r--r-- | backend.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/backend.h b/backend.h new file mode 100644 index 0000000..18c3752 --- /dev/null +++ b/backend.h @@ -0,0 +1,117 @@ +/* + Copyright 2013 Michael Pavone + This file is part of BlastEm. + BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. +*/ +#ifndef BACKEND_H_ +#define BACKEND_H_ + +#include <stdint.h> +#include <stdio.h> +#include "gen.h" + +#define INVALID_OFFSET 0xFFFFFFFF +#define EXTENSION_WORD 0xFFFFFFFE + +#if defined(X86_32) || defined(X86_64) +typedef struct { + int32_t disp; + uint8_t mode; + uint8_t base; + uint8_t index; +} host_ea; +#else +typedef struct { + int32_t disp; + uint8_t mode; + uint8_t base; +} host_ea; +#endif + +typedef struct { + uint8_t *base; + int32_t *offsets; +} native_map_slot; + +typedef struct deferred_addr { + struct deferred_addr *next; + code_ptr dest; + uint32_t address; +} deferred_addr; + +typedef enum { + READ_16, + READ_8, + WRITE_16, + WRITE_8 +} ftype; + +typedef struct { + uint32_t flags; + native_map_slot *native_code_map; + deferred_addr *deferred; + code_info code; + uint8_t **ram_inst_sizes; + code_ptr save_context; + code_ptr load_context; + code_ptr handle_cycle_limit; + code_ptr handle_cycle_limit_int; + code_ptr handle_code_write; + uint32_t address_mask; + uint32_t max_address; + uint32_t bus_cycles; + int32_t mem_ptr_off; + int32_t ram_flags_off; + uint8_t ram_flags_shift; + uint8_t address_size; + uint8_t byte_swap; + uint8_t context_reg; + uint8_t cycles; + uint8_t limit; + uint8_t scratch1; + uint8_t scratch2; +} cpu_options; + + +#define MMAP_READ 0x01 +#define MMAP_WRITE 0x02 +#define MMAP_CODE 0x04 +#define MMAP_PTR_IDX 0x08 +#define MMAP_ONLY_ODD 0x10 +#define MMAP_ONLY_EVEN 0x20 +#define MMAP_FUNC_NULL 0x40 +#define MMAP_BYTESWAP 0x80 + +typedef uint16_t (*read_16_fun)(uint32_t address, void * context); +typedef uint8_t (*read_8_fun)(uint32_t address, void * context); +typedef void * (*write_16_fun)(uint32_t address, void * context, uint16_t value); +typedef void * (*write_8_fun)(uint32_t address, void * context, uint8_t value); + +typedef struct { + uint32_t start; + uint32_t end; + uint32_t mask; + uint16_t ptr_index; + uint16_t flags; + void * buffer; + read_16_fun read_16; + write_16_fun write_16; + read_8_fun read_8; + write_8_fun write_8; +} memmap_chunk; + +typedef uint8_t * (*native_addr_func)(void * context, uint32_t address); + +deferred_addr * defer_address(deferred_addr * old_head, uint32_t address, uint8_t *dest); +void remove_deferred_until(deferred_addr **head_ptr, deferred_addr * remove_to); +void process_deferred(deferred_addr ** head_ptr, void * context, native_addr_func get_native); + +void cycles(cpu_options *opts, uint32_t num); +void check_cycles_int(cpu_options *opts, uint32_t address); +void check_cycles(cpu_options * opts); +void check_code_prologue(code_info *code); + +code_ptr gen_mem_fun(cpu_options * opts, memmap_chunk const * memmap, uint32_t num_chunks, ftype fun_type, code_ptr *after_inc); + +#endif //BACKEND_H_ + |