Added Memory and variable functions
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Jeremiah Orians
parent
40ec859e51
commit
968f5852bf
161
stage2/forth.s
161
stage2/forth.s
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@ -13,6 +13,9 @@
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;; Next pointer [R13]
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;; Current pointer [R12]
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;; Address of NEXT [R11]
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;; Forth STATE [R10]
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;; Forth LATEST (Pointer to last defined function) [R9]
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;; Forth HERE (Pointer to next free byte in HEAP) [R8]
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;; Start function
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;; Loads contents of tape_01
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@ -391,5 +394,163 @@
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PUSHR R0 R14
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JSR_COROUTINE R11 ; NEXT
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;; LIT
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:LIT_Text
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"LIT"
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:LIT_Entry
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&NOT_Entry ; Pointer to NOT
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&LIT_Text ; Pointer to Name
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NOP ; Flags
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LOAD R0 R11 0 ; Get contents of NEXT
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ADDUI R11 R11 4 ; Increment NEXT
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PUSHR R0 R14 ; Put immediate onto stack
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JSR_COROUTINE R11 ; NEXT
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;; Memory manipulation instructions
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;; STORE
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:Store_Text
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"!"
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:Store_Entry
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&LIT_Entry ; Pointer to LIT
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&Store_Text ; Pointer to Name
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NOP ; Flags
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POPR R0 R14 ; Destination
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POPR R1 R14 ; Contents
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STORE R1 R0 0 ; Write out
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JSR_COROUTINE R11 ; NEXT
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;; FETCH
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:Fetch_Text
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"@"
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:Fetch_Entry
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&Store_Entry ; Pointer to Store
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&Fetch_Text ; Pointer to Name
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NOP ; Flags
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POPR R0 R14 ; Source address
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LOAD R0 R0 0 ; Get Contents
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PUSHR R0 R14 ; Push Contents
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JSR_COROUTINE R11 ; NEXT
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;; ADDSTORE
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:AStore_Text
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"+!"
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:AStore_Entry
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&Fetch_Entry ; Pointer to Fetch
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&AStore_Text ; Pointer to Name
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NOP ; Flags
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POPR R0 R14 ; Destination
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POPR R1 R14 ; How much to add
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LOAD R2 R0 0 ; Get contents of address
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ADD R1 R1 R2 ; Combine
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STORE R1 R0 0 ; Write out
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JSR_COROUTINE R11 ; NEXT
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;; SUBSTORE
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:SStore_Text
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"-!"
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:SStore_Entry
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&AStore_Entry ; Pointer to ADDSTORE
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&SStore_Text ; Pointer to Name
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NOP ; Flags
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POPR R0 R14 ; Destination
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POPR R1 R14 ; How much to sub
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LOAD R2 R0 0 ; Get contents of address
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SUB R1 R2 R1 ; Subtract
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STORE R1 R0 0 ; Write out
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JSR_COROUTINE R11 ; NEXT
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;; STOREBYTE
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:SByte_Text
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"C!"
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:SByte_Entry
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&SStore_Entry ; Pointer to SUBSTORE
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&SByte_Text ; Pointer to Name
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NOP ; Flags
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POPR R0 R14 ; Destination
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POPR R1 R14 ; Contents
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STORE8 R1 R0 0 ; Write out
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JSR_COROUTINE R11 ; NEXT
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;; FETCHBYTE
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:FByte_Text
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"C@"
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:FByte_Entry
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&SByte_Entry ; Pointer to STOREBYTE
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&FByte_Text ; Pointer to Name
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NOP ; Flags
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POPR R0 R14 ; Source address
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LOADU8 R0 R0 0 ; Get Contents
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PUSHR R0 R14 ; Push Contents
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JSR_COROUTINE R11 ; NEXT
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;; CMOVE
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:CMove_Text
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"CMOVE"
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:CMove_Entry
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&FByte_Entry ; Pointer to FETCHBYTE
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&CMove_Text ; Pointer to Name
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NOP ; Flags
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POPR R0 R14 ; Get number of bytes to Move
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POPR R1 R14 ; Where to put the result
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POPR R2 R14 ; Where it is coming from
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FALSE R4 ; Prepare for Zeroing
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:Cmove_Main
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CMPSKIPI.GE R0 4 ; Loop if we have 4 or more bytes to move
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JUMP @Cmove_Slow ; Otherwise slowly move bytes
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LOAD R3 R2 0 ; Get 4 Bytes
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STORE R4 R2 0 ; Overwrite that memory with Zeros
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STORE R3 R1 0 ; Store them at the destination
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ADDUI R1 R1 4 ; Increment Source by 4
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ADDUI R2 R2 4 ; Increment Destination by 4
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SUBI R0 R0 4 ; Decrement number of bytes to move by 4
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JUMP @Cmove_Main ; Loop more
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:Cmove_Slow
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CMPSKIPI.G R0 0 ; While number of bytes is greater than 0
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JUMP @Cmove_Done ; Otherwise be done
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LOADU8 R3 R2 0 ; Get 4 Bytes
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STORE8 R4 R2 0 ; Overwrite that memory with Zeros
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STORE8 R3 R1 0 ; Store them at the destination
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ADDUI R1 R1 1 ; Increment Source by 1
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ADDUI R2 R2 1 ; Increment Destination by 1
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SUBI R0 R0 1 ; Decrement number of bytes to move by 1
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JUMP @Cmove_Slow ; Loop more
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:Cmove_Done
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JSR_COROUTINE R11 ; NEXT
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;; Global variables
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;; STATE
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:State_Text
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"STATE"
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:State_Entry
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&CMove_Entry ; Pointer to CMOVE
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&State_Text ; Pointer to Name
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NOP ; Flags
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PUSHR R10 R14 ; Put STATE onto stack
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JSR_COROUTINE R11 ; NEXT
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;; LATEST
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:Latest_Text
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"LATEST"
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:Latest_Entry
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&State_Entry ; Pointer to STATE
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&Latest_Text ; Pointer to Name
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NOP ; Flags
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PUSHR R9 R14 ; Put LATEST onto stack
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JSR_COROUTINE R11 ; NEXT
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;; HERE
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:Here_Text
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"HERE"
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:Here_Entry
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&Latest_Entry ; Pointer to
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&Here_Text ; Pointer to Name
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NOP ; Flags
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PUSHR R8 R14 ; Put HERE onto stack
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JSR_COROUTINE R11 ; NEXT
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:cold_start
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;;
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