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get asm symbolic source debugging working with gnu assembler and gdb psyq builds
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# GPU Registers
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.equiv gpio_port0, 0x1810 # 1F801810h-Write GP0: Send GP0 Commands/Packets (Rendering and VRAM Access)
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.equiv gpio_port1, 0x1814 # 1F801814h-Write GP1: Send GP1 Commands (Display Control) (and DMA Control)
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# GPU Command Format: [7:8] Command (8-bit), [0:6] Paraemter (24-bit)
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.equiv gcmd_offset, 24
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.equiv gcmd_Reset, 0b000
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.equiv gcmd_Polygon, 0b001
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.equiv gcmd_Line, 0b010
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.equiv gcmd_Rect, 0b011
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.equiv gcmd_VM_to_VM, 0b100
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.equiv gcmd_CPU_to_VM, 0b101
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.equiv gcmd_VM_to_CPU, 0b110
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.equiv gcmd_Environment, 0b111
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.equiv gcmd_SetDrawMode, 0xE1
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.equiv gcmd_SetTextureWindow, 0xE2
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.equiv gcmd_SetDrawArea_TopLeft, 0xE3
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.equiv gcmd_SetDrawArea_BotRight, 0xE4
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.equiv gcmd_SetDrawOffset, 0xE5
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.equiv gcmd_SetMaskBit, 0xE6
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.equiv gcmd_ResetCommandBuffer, 0x01
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.equiv gcmd_AcknowledgeGPUInterrupt, 0x02
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.equiv gcmd_DisplayEnable, 0x03
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.equiv gcmd_DMA_Request, 0x04
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.equiv gcmd_DispArea_Start, 0x05
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.equiv gcmd_HorizontalDisplayRange, 0x06
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.equiv gcmd_VerticalDisplayRange, 0x07
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.equiv gcmd_DisplayMode, 0x08
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.equiv gcmd_SetVramSize, 0x09
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.equiv gp_Reset, gcmd_Reset << gcmd_offset
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# GP1(03h) - Display Enable
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# On: 0x0
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# Off: 0x1
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.equiv gp_DisplayEnabled, gcmd_DisplayEnable << gcmd_offset | 0x0
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.equiv gp_DisplayDisabled, gcmd_DisplayEnable << gcmd_offset | 0x1
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# GP1(04h) - DMA Direction / Data Request
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# 0-1 DMA Direction (0=Off, 1=FIFO, 2=CPUtoGP0, 3=GPUREADtoCPU) ;GPUSTAT.29-30
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# 2-23 Not used (zero)
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.equiv gp_DMA_FIFO, 1
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.equiv gp_DMA_CPU_to_GPU, 2
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.equiv gp_DMA_GPU_to_CPU, 3
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.equiv gp_DMA_Request, gcmd_DMA_Request << gcmd_offset
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# GP1(06h) - Horizontal Display range (on Screen)
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# X2 = X1 + pixels * cycles_per_pix
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# 0 - 11 X1 (260h + 0) ; 12bit ; \ counted in video clock units,
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# 12 - 23 X2 (260h + 320 * 8) ; 12bit ; / relative to HSYNC
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.equiv gp_HorizontalDisplayRange_3168_608, gcmd_HorizontalDisplayRange << gcmd_offset | 0xC60 << 12 | 0x260
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# GP1(07h) - Vertical Display range (on Screen)
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# 0 - 9 Y1 (NTSC = 88h - (240 / 2), (PAL = A3h - (288 / 2)) ; \ scanline numbers on screen,
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# 10 - 19 Y2 (NTSC = 88h + (240 / 2), (PAL = A3h + (288 / 2)) ; / relative to VSYNC
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# 20 - 23 Not used (zero)
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.equiv gp_VerticalDiplayRange, gcmd_VerticalDisplayRange << gcmd_offset
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.equiv gp_VerticalDisplayRange_264_24, gp_VerticalDiplayRange | 264 << 10 | 24
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.equiv gp_VerticalDisplayRange_504_24, gp_VerticalDiplayRange | 504 << 10 | 24
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# GP1(08h) - Display mode
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# 0-1 Horizontal Resolution 1 (0=256, 1=320, 2=512, 3=640) ;GPUSTAT.17-18
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# 2 Vertical Resolution (0=240, 1=480, when Bit5=1) ;GPUSTAT.19
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# 3 Video Mode (0=NTSC/60Hz, 1=PAL/50Hz) ;GPUSTAT.20
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# 4 Display Area Color Depth (0=15bit, 1=24bit) ;GPUSTAT.21
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# 5 Vertical Interlace (0=Off, 1=On) ;GPUSTAT.22
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# 6 Horizontal Resolution 2 (0=256/320/512/640, 1=368) ;GPUSTAT.16
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# 7 Flip screen horizontally (0=Off, 1=On, v1 only) ;GPUSTAT.14
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# 8-23 Not used (zero)
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.equiv gp_DisplayMode, 0x8 << gcmd_offset
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.equiv gp_Disp_HRes_256, 0x0
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.equiv gp_Disp_HRes_320, 0x1
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.equiv gp_Disp_HRes_512, 0x2
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.equiv gp_Disp_HRes_640, 0x3
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.equiv gp_Disp_VRes_240, 0x0 << 2
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.equiv gp_Disp_VRes_480, 0x1 << 2
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.equiv gp_Disp_Color15, 0x0 << 4
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.equiv gp_Disp_Color24, 0x1 << 4
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.equiv gp_Disp_VInterlace, 0x1 << 5
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.equiv gp_DisplayMode_320x240_15bit_NTSC, gp_DisplayMode | gp_Disp_HRes_320 | gp_Disp_VRes_240 | gp_Disp_Color15
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.equiv gp_DisplayMOde_640x480_24bbp_NTSC, gp_DisplayMode | gp_Disp_HRes_640 | gp_Disp_VRes_480 | gp_Disp_Color24 | gp_Disp_VInterlace
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# GP0(E1h) - Draw Mode setting (aka "Texpage")
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# 0 - 3 Texture page X Base (N * 64) (ie. in 64-halfword steps) ; GPUSTAT.0-3
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# 4 Texture page Y Base 1 (N * 256) (ie. 0, 256, 512 or 768) ; GPUSTAT.4
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# 5 - 6 Semi-transparency (0 = B / 2 + F / 2, 1 = B + F, 2 = B - F, 3 = B + F / 4) ; GPUSTAT.5-6
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# 7 - 8 Texture page colors (0 = 4 bit, 1 = 8bit, 2 = 15bit, 3 = Reserved) ; GPUSTAT.7-8
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# 9 Dither 24bit to 15bit (0=Off / strip LSBs, 1 = Dither Enabled) ; GPUSTAT.9
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# 10 Drawing to display area (0=Prohibited, 1=Allowed) ; GPUSTAT.10
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# 11 Texture page Y Base 2 (N * 512) (only for 2 MB VRAM) ; GPUSTAT.15
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# 12 Textured Rectangle X-Flip (BIOS does set this bit on power-up...?)
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# 13 Textured Rectangle Y-Flip (BIOS does set it equal to GPUSTAT.13...?)
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# 14 - 23 Not used (should be 0)
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# 24 - 31 Command (E1h)
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.equiv gp_SetDisplayMode_DrawAllowed, 10
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.equiv gp_SetDisplayMode_DipArea, gcmd_SetDrawMode << gcmd_offset | 0x1 << gp_SetDisplayMode_DrawAllowed
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# GP0(E3h) - Set Drawing Area top left (X1,Y1)
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# GP0(E4h) - Set Drawing Area bottom right (X2,Y2)
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# Sets the drawing area corners. The Render commands GP0(20h..7Fh)
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# are automatically clipping any pixels that are outside of this region.
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# 0 - 9 X-coordinate (0..1023)
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# 10 - 18 Y-coordinate (0..511) ; \ on v0 GPU (max 1 MB VRAM)
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# 19 - 23 Not used (zero) ; /
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# 10 - 19 Y-coordinate (0..1023) ; \ on v2 GPU (max 2 MB VRAM)
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# 20 - 23 Not used (zero) ; /
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# 24 - 31 Command (Exh)
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.equiv gp_SetArea_TopLeft, gcmd_SetDrawArea_TopLeft << gcmd_offset
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.equiv gp_SetArea_BottomRight, gcmd_SetDrawArea_BotRight << gcmd_offset
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# GP0(E5h) - Set Drawing Offset (X,Y)
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# 0-9 X-coordinate (0..1023)
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# 10-18 Y-coordinate (0..511) ;\on v0 GPU (max 1 MB VRAM)
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# 19-23 Not used (zero) ;/
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# 10-19 Y-coordinate (0..1023) ;\on v2 GPU (max 2 MB VRAM)
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# 20-23 Not used (zero) ;/
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# 24-31 Command (Exh)
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.equiv gp_SetOffset, gcmd_SetDrawOffset << gcmd_offset
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# GPU Memory Transfer Commands
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# GP0(02h) Fill Vram
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# GP0(02h) - Fill Rectangle in VRAM
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# 1st Color+Command (CcBbGgRrh) ;24bit RGB value (see note)
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# 2nd Top Left Corner (YyyyXxxxh) ;Xpos counted in halfwords, steps of 10h
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# 3rd Width+Height (YsizXsizh) ;Xsiz counted in halfwords, steps of 10h
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# Fills the area in the frame buffer with the value in RGB.
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# Horizontally the filling is done in 16-pixel (32-bytes) units (see below masking/rounding).
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# The "Color" parameter is a 24bit RGB value, however, the actual fill data is 16bit:
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# The hardware automatically converts the 24bit RGB value to 15bit RGB (with bit15=0).
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# Fill is NOT affected by the Mask settings (acts as if Mask.Bit0,1 are both zero).
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.equiv gp_RectFillVM, 0x02 << gcmd_offset
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# GP0(A0h) - Copy Rectangle (CPU to VRAM)
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# Transfers data from CPU to frame buffer.
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# If the number of halfwords to be sent is odd, an extra halfword should be sent,
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# as packets consist of 32bits words. The transfer is affected by Mask setting.
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# 1st Command (Cc000000h)
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# 2nd Destination Coord (YyyyXxxxh) ;Xpos counted in halfwords
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# 3rd Width+Height (YsizXsizh) ;Xsiz counted in halfwords
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# ... Data (...) <--- usually transferred via DMA
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.equiv gp_Blit_VM_VM, gcmd_VM_to_VM << gcmd_offset
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.equiv gp_Blit_CPU_VM, gcmd_CPU_to_VM << gcmd_offset
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.equiv gp_Blit_VM_CPU, gcmd_VM_to_CPU << gcmd_offset
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# GPU Render Polygon Commands
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# When the upper 3 bits of the first GP0 command are set to 1 (001),
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# then the command can be decoded using the following bitfield:
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# bit number value meaning
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# 31-29 001 polygon render
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# 28 1/0 gouraud / flat shading
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# 27 1/0 4 / 3 vertices
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# 26 1/0 textured / untextured
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# 25 1/0 semi-transparent / opaque
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# 24 1/0 raw texture / modulation
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# 23-0 rgb first color value.
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.equiv gp_Poly_FirstColor, 0
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.equiv gp_Poly_RawTexture, 1 << 24
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.equiv gp_Poly_SemiTrans, 1 << 25
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.equiv gp_Poly_Textured, 1 << 26
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.equiv gp_Poly_Quad, 1 << 27
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.equiv gp_Poly_Tri, 0 << 27
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.equiv gp_Poly_ShadeFlat, 0 << 28
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.equiv gp_Poly_ShadeGourand, 1 << 28
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.equiv gp_Polygon, 1 << 29
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.equiv gp_Quad, gp_Polygon | gp_Poly_Quad
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.equiv gp_b10_X, 0
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.equiv gp_b10_Y, 10
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.equiv gp_b16_X, 0
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.equiv gp_b16_Y, 16
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.equiv gp_pixel16, (2 * byte)
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.equiv gp_pixel24, (3 * byte)
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.equiv gp_vec2, word
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.macro gp_push_pak port, reg_scratch, packet
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load_imm \reg_scratch, \packet
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store_word \reg_scratch, \port
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.endm
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.macro gcmd_push port, reg_scratch, cmd
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load_imm \reg_scratch, \cmd
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store_word \reg_scratch, \port
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.endm
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