initial commit

stdlib.asm

@@ -0,0 +1,30 @@
+; ===== INTRODUCTION =====
+; This is supposed to provide some standard library functionality for stock symphony.
+; In particular its supposed to work with an unmodified ISA, that means some choices are not 
+; optimal (RA being stored in flags for example)
+
+; ===== ABI =====
+
+; ----- CALLING CONVENTION -----
+; n.a. zr
+; preserved: sp, r8 - r13
+; scratch: flags, r1 - r7
+; arguments: r1 - r7 (r1 = 1st argument, r6 = 6th arg/stack args, r7 = 7th arg/stack res)
+; result: r1, r2 (r1 = low word, r2 = high word)
+; return address: flags
+
+; ----- STACK -----
+; grows downwards from top of memory
+; arguments are passed in reverse order with the stack so:
+; lowest address = 1st stack arg
+; highest address = last stack arg
+
+; ----- HEAP -----
+; i am not sure if there will ever be heap functionality, but to future proof:
+; this library will use the label "heap_start" with the constant "heap_size" 
+; to determine properties of the heap
+; you **have** to define those if you want this to compile
+
+; ===== TYPES =====
+
+include bit