Further progress on M0-macro.s implementation
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@ -273,6 +273,96 @@
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POPR R2 R15
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RET R15
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;; strcmp function
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;; Recieves pointers to null terminated strings
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;; In R0 and R1
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;; Returns if they are equal in R0
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;; Returns to whatever called it
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:strcmp
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;; Preserve registers
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PUSHR R2 R15
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PUSHR R3 R15
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PUSHR R4 R15
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;; Setup registers
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MOVE R2 R0 ; Put R0 in a safe place
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MOVE R3 R1 ; Put R1 in a safe place
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LOADUI R4 0 ; Starting at index 0
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:cmpbyte
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LOADXU8 R0 R2 R4 ; Get a byte of our first string
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LOADXU8 R1 R3 R4 ; Get a byte of our second string
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ADDUI R4 R4 1 ; Prep for next loop
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CMP R1 R0 R1 ; Compare the bytes
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CMPSKIP.E R0 0 ; Stop if byte is NULL
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JUMP.E R1 @cmpbyte ; Loop if bytes are equal
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;; Done
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MOVE R0 R1 ; Prepare for return
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;; Restore registers
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POPR R4 R15
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POPR R3 R15
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POPR R2 R15
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RET R15
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;; Identify_Macros Function
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;; Recieves a pointer to a node in R0
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;; If the text stored in its Text segment matches
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;; DEFINE, flag it and its next two nodes as macro
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;; Loop until all nodes are checked
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;; Return to whatever called it
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:Identify_Macros
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;; Preserve Registers
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PUSHR R0 R15
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PUSHR R1 R15
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PUSHR R2 R15
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;; Main Loop
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:Identify_Macros_0
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MOVE R1 R0
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LOADUI R0 $Identify_Macros_string
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CALLI R15 @strcmp
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JUMP.NE R0 @Identify_Macros_1
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;; It is a definition
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LOADUI R0 1 ; The Enum value for macro
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STORE32 R0 R1 4 ; Set node type
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LOAD32 R2 R1 0 ; Get Next
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STORE32 R0 R2 4 ; Set its node type
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LOAD32 R2 R2 0 ; Get Next
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STORE32 R0 R2 4 ; Set its node type
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:Identify_Macros_1
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LOAD32 R0 R1 0 ; Get node->next
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CMPSKIP.NE R0 0 ; If node->next is NULL
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JUMP @Identify_Macros_Done ; Be done
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;; Otherwise keep looping
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JUMP @Identify_Macros_0
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:Identify_Macros_Done
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;; Restore registers
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POPR R2 R15
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POPR R1 R15
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POPR R0 R15
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RET R15
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:Identify_Macros_string
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"DEFINE"
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;; Line_Macro Function
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;; Recieves a node pointer in R0
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;; Causes macros to be applied
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;; Returns to whatever called it
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:Line_Macro
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;; Preserve Registers
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PUSHR R0 R15
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PUSHR R1 R15
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PUSHR R2 R15
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:Line_Macro_0
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MOVE R1 R0
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LOADUI R0 $Identify_Macros_string
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CALLI R15 @strcmp
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;; Where we are putting the start of our stack
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:stack
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