initial commit

armv6/tutorial/branching.s

@@ -0,0 +1,12 @@
+@ <intstruction> <destination> , <operand>, <operand>
+
+.global _start
+
+_start:
+	MOV R0, #20
+	B other
+	MOV R0, #11
+
+other:
+	MOV R7, #1
+	SWI 0

armv6/tutorial/conditionaljump.s

@@ -0,0 +1,32 @@
+@ <intstruction> <destination> , <operand>, <operand>
+
+.global _start
+
+/*
+	CMP R1. R2
+	if R1 <  R2 then N is enabled
+	if R1 >  R2 then N is disabled 
+	if R1 == R2 then Z is enabled
+*/
+
+_start:
+	MOV R1, #20
+	MOV R2, #10
+	CMP R1, R2
+	BEQ values_equal
+	BGT values_greater
+
+values_less:
+	MOV R0, #2
+	B end	
+
+values_equal:
+	MOV R0, #1
+	B end
+
+values_greater:
+	MOV R0, #3
+
+end:
+	MOV R7,	#1	@ exit to terminal
+	SWI 0		@ system reads R7 after interrupt

armv6/tutorial/helloworld.s

@@ -0,0 +1,16 @@
+.global _start
+
+_start:
+	MOV R7, #4 @ system call to say we want to output
+	MOV R0, #1 @ use the window as output device
+	MOV R2, #12 @ length of our output message
+	LDR R1, =message
+	SWI 0
+
+end:
+	MOV R7, #1
+	SWI 0
+
+.data
+message:
+	.ascii "Hello World\n"

armv6/tutorial/inputexample.s

@@ -0,0 +1,23 @@
+.global _start
+
+_start:
+	MOV R7, #3	@ system call to say we want to read input
+	MOV R0, #0	@ read from input device keyboard
+	MOV R2, #10	@ read 10 chars
+	LDR R1, =message
+	SWI 0
+
+_write:
+	MOV R7, #4 	@ output
+	MOV R0, #1 	@ to screen
+	MOV R2, #5 	@ 5 chars
+	LDR R1, =message
+	SWI 0
+
+end:
+	MOV R7, #1
+	SWI 0
+
+.data
+message:
+	.ascii " "

armv6/tutorial/instructions.s

@@ -0,0 +1,14 @@
+@ <intstruction> <destination> , <operand>, <operand>
+
+.global _start
+
+_start:
+	MOV R1, #0x04
+	MOV R2, #0x03
+	MOV R3, #0x08
+	ADD R0, R1, R1
+	SUB R0, R1, #0x02
+	MUL R0, R1, R2
+	MLA R0, R1, R2, R3
+	MOV R7, #1
+	SWI 0

armv6/tutorial/logicaloperators.s

@@ -0,0 +1,11 @@
+@ instruction <destination>, <operand>, <operand>
+
+.global _start
+
+_start:
+	MOV R1, #5 @ 0101
+	MOV R2, #9 @ 1001
+	AND R0, R1, R2
+end:
+	MOV R7, #1
+	SWI 0

armv6/tutorial/makefile

@@ -0,0 +1,34 @@
+AS = as
+LINKER = ld
+
+%.o: %.s
+	$(AS) $^ -o $@
+
+tutorial: tutorial.o
+	$(LINKER) $^ -o $@
+
+tutorial2: tutorial2.o tutorial2p2.o
+	$(LINKER) $^ -o $@
+
+helloworld: helloworld.o
+	$(LINKER) $^ -o $@
+
+inputexample: inputexample.o
+	$(LINKER) $^ -o $@
+
+instructions: instructions.o
+	$(LINKER) $^ -o $@
+
+branching: branching.o
+	$(LINKER) $^ -o $@
+
+conditionaljump: conditionaljump.o
+	$(LINKER) $^ -o $@
+
+.PHONY: clean
+clean:
+	rm *.o
+	rm tutorial
+	rm tutorial2
+	rm helloworld
+	rm inputexample

armv6/tutorial/tutorial.s

@@ -0,0 +1,15 @@
+@single line comment
+
+/*
+Multi line comment
+*/
+
+.text
+
+.global _start @entry point
+
+_start: @label
+	MOV R0, #65
+	MOV R7, #1
+
+SWI 0

armv6/tutorial/tutorial2.s

@@ -0,0 +1,4 @@
+.global _start
+_start:
+	MOV R0, #65
+	BAL _part2

armv6/tutorial/tutorial2p2.s

@@ -0,0 +1,4 @@
+.global _part2
+_part2:
+	MOV R7, #1
+	SWI 0

armv6/tutorial/tutorial3.s

@@ -0,0 +1,22 @@
+/*
+bit = 1 bit
+nibble = 4 bits
+byte = 8 bits
+word = 32 bits
+*/
+
+/*
+16 registers of length word
+	13 general purpose
+	1 stack pointer
+	1 link register
+	1 program counter
+*/
+
+/*
+CPSR = Current Program Status Registers
+	N = negative result flag
+	Z = zero result flag
+	C = carry over flag
+	V = overflow flag
+*/