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view src/varargs.inc @ 655:c7b7b8a358cd default tip
hwOS tech 3.22 release
| author | heinrichsweikamp |
|---|---|
| date | Mon, 29 Apr 2024 13:05:18 +0200 |
| parents | 75e90cd0c2c3 |
| children |
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;============================================================================= ; ; File varargs.inc * combined next generation V3.0.1 ; ; Utilities to pass multiple arguments in compact code stream. ; ; Copyright (c) 2011, JD Gascuel, heinrichs weikamp gmbh, all right reserved. ;============================================================================= ; HISTORY ; 2011-05-27 : [jDG] Creation. ; ;----------------------------------------------------------------------------- ; Prepare reading inline Data: set Table Pointer to the Beginn of the inline Data ; VARARGS_BEGIN macro movff TOSL, TBLPTRL ; copy program counter address to table pointer movff TOSH, TBLPTRH ; ... movff TOSU, TBLPTRU ; ... endm ;----------------------------------------------------------------------------- ; Read 1 Byte of inline Data ; VARARGS_GET8 macro register tblrd*+ ; read 1 byte from program memory movff TABLAT, register ; store to register endm ;----------------------------------------------------------------------------- ; Read 2 Bytes of inline Data ; VARARGS_GET16 macro register tblrd*+ ; read 1st byte from program memory movff TABLAT, register+0 ; store to register tblrd*+ ; read 2nd byte from program memory movff TABLAT, register+1 ; store to register endm ;----------------------------------------------------------------------------- ; Read 3 Bytes of inline Data ; VARARGS_GET24 macro register tblrd*+ ; read 1st byte from program memory movff TABLAT, register+0 ; store to register tblrd*+ ; read 2nd byte from program memory movff TABLAT, register+1 ; store to register tblrd*+ ; read 3rd byte from program memory movff TABLAT, register+2 ; store to register endm ;----------------------------------------------------------------------------- ; Align Table Pointer to an even Address ; VARARGS_ALIGN macro btfsc TBLPTRL,0 ; table pointer pointing to an even address? tblrd*+ ; NO - do a dummy read to advance to next even address endm ;----------------------------------------------------------------------------- ; End reading inline Data: set Return Address behind End of the inline Data ; VARARGS_END macro movf TOSL,W ; compute how may inline bytes have been read subwf TBLPTRL,W ; WREG = (TBLPTRL - TOSL) modulo 256 addwf TOSL,F ; advance the return address by this number movlw 0 ; ... addwfc TOSH,F ; ... addwfc TOSU,F ; ... endm