added register names, base on no$ docs

assembler.rb

@@ -22,6 +22,39 @@ def string(s)
 end
 
 
+# # # REGISTER NAMES # # #
+def at() 1 end # assembler temporary
+
+# subroutine return values, may be changed by subroutines
+def v0() 2 end ; def v0() 3 end
+
+# subroutine arguments, may be changed by subroutines
+def a0() 4 end ; def a1() 5 end
+def a2() 6 end ; def a3() 7 end
+
+# temporaries, may be changed by subroutines
+def t0() 8 end ; def t1() 9 end
+def t2() 10 end ; def t3() 11 end
+def t4() 12 end ; def t5() 13 end
+def t6() 14 end ; def t7() 15 end
+
+# static variables, must be saved by subs
+def s0() 16 end ; def s1() 17 end
+def s2() 18 end ; def s3() 19 end
+def s4() 20 end ; def s5() 21 end
+def s6() 22 end ; def s7() 23 end
+
+# temporaries, may be changed by subroutines
+def t8() 24 end ; def t9() 25 end
+
+# reserved for kernel, detroyed by some irq handlers
+def k0() 26 end ; def k1() 27 end
+
+def gp() 28 end # global pointer, rarely used
+def sp() 29 end # stack pointer
+def fp() 30 end # frame pointer
+def ra() 31 end # return address
+
 
 
 # # # INSTRUCTIONS # # #
@@ -113,7 +146,7 @@ end
 
 # # # CONSTANTS # # #
 $base_addr = 0x80010000 # 0x10000 # 0x80010000
-$file_size = 0x800
+$file_size = 0x800 * 3
 $gp0 = 0x1F801810
 
 # # # EXE HEADER # # #