133 lines
4.2 KiB
PHP
133 lines
4.2 KiB
PHP
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//#define DEBUG
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//#define TRACE bl trace
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#define TRACE
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#ifdef DEBUG
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.macro ERROR code
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bkpt #\code
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.endm
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.macro CERROR cond, code
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b\cond .+8
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b .+8
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bkpt #\code
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.endm
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#else
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.macro ERROR code
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b exit_emulator
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.endm
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.macro CERROR cond, code
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b\cond exit_emulator
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.endm
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#endif
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// System calls
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#define e_fopen 0
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#define e_fread 1
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#define e_fwrite 2
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#define e_fclose 3
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#define e_malloc 5
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#define e_free 6
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#define e_memset 7
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#define e_NU_Get_First 23
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#define e_NU_Get_Next 24
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#define e_NU_Done 25
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#define e_strcpy 27
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#define e_touchpad_read 75
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#define e_touchpad_write 76
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// Global data structure: r9 points to this at all times
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// Note some requirements:
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// * to do "ldr reg, [r9, #s_xxx]", offset must be below 0x1000
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// * to do "add reg, r9, #s_xxx", offset must be representable as a shifted byte
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// When changing an existing offset, don't forget to "del *.o"!
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#define s_wram 0x0000 // 0800 bytes
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// CPU data
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#define s_mem_map 0x0800 // 0024 bytes (9 entries, 4 bytes each)
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#define s_flags_di 0x0824 // 0004 bytes
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#define s_pc_base 0x0828 // 0004 bytes
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#define s_interrupts 0x082C
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#define s_irq_from_apu 0x082C
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#define s_irq_from_mapper 0x082D
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#define s_nmi_reset 0x082F // set to FF for reset, 80 for nmi
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#define s_input_status 0x0840
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#define s_input_queue 0x0844
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// PPU ("Picture Processing Unit") data
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#define s_ppu_mem_map 0x0880 // 0040 bytes
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#define s_ppu_palette 0x08C0 // 0020 bytes
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#define s_ppu_flags 0x08E0
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#define s_ppu_control s_ppu_flags+0 // $2000
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#define s_ppu_mask s_ppu_flags+1 // $2001
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#define s_ppu_status s_ppu_flags+2 // $2002
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#define s_ppu_oam_addr 0x08E4 // $2003
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#define s_ppu_scroll 0x08E8 // $2005 (x/y toggle in bit 16, x fine in bits 29-31)
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#define s_ppu_address 0x08EC // $2006
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#define s_ppu_data 0x08F0 // $2007 buffer
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#define s_ppu_scanline 0x08F4
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#define s_ppu_oam_ram 0x0900 // 0100 bytes - must be 256-byte aligned
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// Emulation data (no relation to anything in an actual NES)
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#define s_frame_count 0x0A00
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#define s_frame_count_rtc 0x0A04
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#define s_saved_sp 0x0A08
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#define s_frame_timer 0x0A0C
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#define s_touchpad_size 0x0A10
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#define s_keypad_command_map 0x0A14
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#define s_keypad_read_input 0x0A18
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#define s_command_keys_pressed 0x0A1C
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#define s_saved_irq_mask 0x0A20
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#define s_saved_irq_handler 0x0A24
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#define s_frameskip 0x0A28
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#define s_frameskip_cur 0x0A2C
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#define s_spr_loc_table_valid 0x0A30
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#define s_hw_irq_masks 0x0A34
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#define s_hw_irq_handler 0x0A38
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#define s_hw_keypad_invert 0x0A3C
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#define s_palette_cache 0x0A40 // 0080 bytes
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#define s_palette_cache_valid 0x0AC0
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#define s_hw_color 0x0AC4
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#define s_border_color 0x0AC8
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#define s_message_timer 0x0AD0
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// ROM data
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#define s_rom_header 0x0AE0
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#define s_mapper 0x0AEC
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#define s_prg_size 0x0AF0
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#define s_prg_ptr 0x0AF4
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#define s_chr_size 0x0AF8
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#define s_chr_ptr 0x0AFC
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#define s_mapper_state 0x0B00 // 0010 bytes
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#define s_path_filename 0x0B80
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#define s_path_extension 0x0B84
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// The big stuff
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#define s_spr_loc_table 0x0B90 // 0870 bytes (9 * 240)
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#define s_name_table_ram 0x1400 // 1000 bytes - must be 128-byte aligned
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#define s_sram 0x2400 // 2000 bytes
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#define s_path 0x4400 // 0200 bytes
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#define s_SIZE 0x4600
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#define s_ALIGN 0x0100
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// CPU register usage:
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// r0 = general purpose temporary
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// r1 = next instruction byte
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// r2 = address low byte or full address
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// r3 = address high byte
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#define cpu_pc r4
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#define cpu_cycles r5
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#define cpu_a r6
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#define cpu_x r7
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#define cpu_y r8
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#define cpu_sp r10
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#define cpu_flags r11
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#define cpu_itable r12
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#define CPU_CYCLE_LENGTH 3
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