Add address deref, syntax, and deref sizes

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

examples/strings.asm

@@ -1,45 +1,30 @@
-data $0x1000 .. $0x1100 {
-    zstr: .zstring  "This is a zero-terminated string"
+.section data $0x1000 .. $0x1100 {
+    zstr: .zstring  "This is a string"
+    str: .string  "This is a string"
 
     .export zstr
+    .export str
 }
 
-code $0x0 {
-    zstr_len:
-        storeimm32 %r15, $0xFF
-        storeimm32 %r16, $1
-        storeimm64 %r20, zstr_next
-        storeimm64 %r21, exit_zstr
+.section code $0x0 {
+    ; Take the length of a zstr without those fancy "function calls" and "stack frames"
+    ; %r0: the input string (in)
+    ; %r1: the return address (in)
+    ; %r2: the length of the string (out)
 
-        regcopy %r10, %r00
-
-    zstr_next:
-        load %r11, %r10
-        and %r11, %r15
-        cmpeq %r11, %null
-        jnz %r21
-        add %r10, %r16
-        jmp %r20
+    zstrlen:
+        mov %r2, %r0
+    ztrlen_loop:
+        cmpeq (%r2)u8, $0
+    zstrlen_end:
+        jmp %r1
 
     main:
-        storeimm64 %r05, zstr_len
-        storeimm64 %r00, zstr
-        jmp %r05
-
-    exit_zstr:
-        regcopy %status, %r10
         halt
-    
-        ineg %r00
-        add %r10, %r00
-        regcopy %status, %r10
-
-    end:
-        halt
-
+        
     .export main
 }
 
-meta {
+.meta {
     entry: main
 }