Added arm package

src/arm/Jump.go

@@ -0,0 +1,41 @@
+package arm
+
+// Jump continues program flow at the new offset.
+func Jump(offset int) uint32 {
+	return 0b000101<<26 | uint32(offset&mask26)
+}
+
+// JumpIfEqual jumps if the result was equal.
+func JumpIfEqual(offset int) uint32 {
+	return branchCond(EQ, offset)
+}
+
+// JumpIfNotEqual jumps if the result was not equal.
+func JumpIfNotEqual(offset int) uint32 {
+	return branchCond(NE, offset)
+}
+
+// JumpIfGreater jumps if the result was greater.
+func JumpIfGreater(offset int) uint32 {
+	return branchCond(GT, offset)
+}
+
+// JumpIfGreaterOrEqual jumps if the result was greater or equal.
+func JumpIfGreaterOrEqual(offset int) uint32 {
+	return branchCond(GE, offset)
+}
+
+// JumpIfLess jumps if the result was less.
+func JumpIfLess(offset int) uint32 {
+	return branchCond(LS, offset)
+}
+
+// JumpIfLessOrEqual jumps if the result was less or equal.
+func JumpIfLessOrEqual(offset int) uint32 {
+	return branchCond(LE, offset)
+}
+
+// branchCond performs a conditional branch to a PC-relative offset.
+func branchCond(cond condition, imm19 int) uint32 {
+	return 0b01010100<<24 | uint32(imm19&mask19)<<5 | uint32(cond)
+}