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