forked from TCShenanigans/symphony_stdlib
Gelthor
46abf8d893
Added support for global variables. This requires including `start.asm` as the first code. This includes a `jmp` to 0x100 for user code, and a magic number that modules can check to verify th the user has correctly reserved the space. The magic number is 0xb301534c: * This has the high bit set so is not a valid instruction * On builds that ignore the high bit this decodes to `nor zr, zr, 0x534c` a no-op. * The immediate is "SL" for standardl ibrary. Due to a bug start pads with U... 0, instead of @addr. `start.asm` also initialises `sp` so it start just below the 64KiB LUT memory alocation. Added some error codes for the upcoming graphics module.
27 lines
754 B
NASM
Executable File
27 lines
754 B
NASM
Executable File
; Error numbers should be 16 bit ODD numbers, so they can be loaded as immediates
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; and can be checked with:
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;
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; qcall falible_function
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; jne falible_ok ; Jump no error
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; ; handle error
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; falible_ok:
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; ; Happy path
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; ; ...
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; OR
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; qcall falible_function
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; je handle_error ; Jump if error
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; ; Happy path
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; ; ...
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; handle_error:
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; ; handle error
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pub const OK = 0x0000
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pub const SCREEN_INVALID_MODE = 0x0001
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pub const SCREEN_INVALID_WIDTH = 0x0003
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pub const SCREEN_FB_TOO_SMALL = 0x0005
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pub const SCREEN_OUTSIDE_FB = 0x0007
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pub const MAGIC_BAD = 0x8001
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; Extended error codes, these would require loading a 32 bit value.
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pub const EXT_OK = 0x00000000 |