| 1 | ; Project name : Assembly Library
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| 2 | ; Description : This is the place to put various generic macros.
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| 3 | ; Should be included immediately after emulate.inc
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| 4 | %ifndef MACROS_INC
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| 5 | %define MACROS_INC
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| 6 |
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| 7 | ;--------------------------------------------------------------------
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| 8 | ; Skips the immediately following 2 byte instruction by using it
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| 9 | ; as an immediate value to a dummy instruction.
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| 10 | ; Destroys the contents of %1.
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| 11 | ;
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| 12 | ; SKIP2B
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| 13 | ; Parameters:
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| 14 | ; %1: Any 16 bit general purpose register or F for flags.
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| 15 | ; Returns:
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| 16 | ; Nothing
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| 17 | ; Corrupts registers:
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| 18 | ; %1
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| 19 | ;--------------------------------------------------------------------
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| 20 | %macro SKIP2B 1
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| 21 | %ifidni %1, f
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| 22 | db 03Dh ; Opcode byte for CMP AX, <immed>
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| 23 | ;db 0A9h ; Alt. version TEST AX, <immed>
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| 24 | %elifidni %1, ax
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| 25 | db 0B8h ; Opcode byte for MOV AX, <immed>
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| 26 | %elifidni %1, cx
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| 27 | db 0B9h ; Opcode byte for MOV CX, <immed>
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| 28 | %elifidni %1, dx
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| 29 | db 0BAh ; Opcode byte for MOV DX, <immed>
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| 30 | %elifidni %1, bx
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| 31 | db 0BBh ; Opcode byte for MOV BX, <immed>
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| 32 | %elifidni %1, sp
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| 33 | db 0BCh ; Opcode byte for MOV SP, <immed>
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| 34 | %elifidni %1, bp
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| 35 | db 0BDh ; Opcode byte for MOV BP, <immed>
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| 36 | %elifidni %1, si
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| 37 | db 0BEh ; Opcode byte for MOV SI, <immed>
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| 38 | %elifidni %1, di
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| 39 | db 0BFh ; Opcode byte for MOV DI, <immed>
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| 40 | %else
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| 41 | %error "Invalid parameter passed to SKIP2B"
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| 42 | %endif
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| 43 | %endmacro
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| 44 |
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| 45 |
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| 46 | ;--------------------------------------------------------------------
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| 47 | ; eENTER_STRUCT
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| 48 | ; Parameters:
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| 49 | ; %1: Number of bytes to reserve from stack
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| 50 | ; Returns:
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| 51 | ; SS:BP: Ptr to beginning of struct reserved from stack
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| 52 | ; Corrupts registers:
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| 53 | ; FLAGS
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| 54 | ;--------------------------------------------------------------------
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| 55 | %macro eENTER_STRUCT 1
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| 56 | push bp
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| 57 | sub sp, %1
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| 58 | mov bp, sp
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| 59 | %endmacro
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| 60 |
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| 61 | ;--------------------------------------------------------------------
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| 62 | ; eLEAVE_STRUCT
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| 63 | ; Parameters:
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| 64 | ; %1: Number of bytes reserved with eENTER_STRUCT
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| 65 | ; Returns:
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| 66 | ; BP: What it was before eENTER_STRUCT
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| 67 | ; Corrupts registers:
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| 68 | ; FLAGS
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| 69 | ;--------------------------------------------------------------------
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| 70 | %macro eLEAVE_STRUCT 1
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| 71 | add sp, %1
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| 72 | pop bp
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| 73 | %endmacro
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| 74 |
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| 75 |
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| 76 | %endif ; MACROS_INC
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