we now have lines!

assembler.rb

@@ -22,9 +22,46 @@ 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 # # #
+
+# ops should always be in format of
+# [src] [args] -> [dest]
+
 def jmp(addr)
 	# TODO: this probs wont show up since we have < 3mb of ram but
 	# we can't jump to an address with a different 4 most significant bits
@@ -45,7 +82,7 @@ end
 # load upper immediate
 # NOTE: val will be shifted left by 16
 def lui(val, dest)
-	#      oooooo ----- ttttt iiiiiiiiiiiiiiii
+	#      oooooo ----- ddddd iiiiiiiiiiiiiiii
 	op = 0b001111_00000_00000_0000000000000000
 	op |= 0xffff & val
 	op |= (0b11111 & dest) << 16
@@ -68,10 +105,20 @@ def ori(src, bits, dest)
 	op = 0b001101_00000_00000_00000000_00000000
 	op |= (src & 0b11111) << 21
 	op |= (bits & 0xffff)
-	op |= (dest & 0x11111) << 16
+	op |= (dest & 0b11111) << 16
 	word op
 end
 
+# store word
+# NOTE: this doesn't work unaligned
+def sw(src, offset, dest)
+	#      oooooo ddddd sssss iiiiiiii iiiiiiii
+	op = 0b101011_00000_00000_00000000_00000000
+	op |= (src & 0b11111) << 16
+	op |= (offset & 0xffff)
+	op |= (dest & 0b11111) << 21
+	word op
+end
 
 
 
@@ -80,9 +127,20 @@ def nop
 	word 0x00000000
 end
 
+# load word immediate
+def lwi(val, dest)
+	lui val >> 16, dest
+	ori dest, val, dest
+end
 
 
 
+
+
+def label
+	return $bytes.length + $base_addr
+end
+
 # this is a terrible idea and im doing it
 #$labels = {}
 #def method_missing(m, *args)
@@ -93,8 +151,9 @@ end
 
 # # # CONSTANTS # # #
 $base_addr = 0x80010000 # 0x10000 # 0x80010000
-$file_size = 0x800
+$file_size = 0x800 * 3
 $gp0 = 0x1F801810
+$gp1 = 0x1F801814
 
 # # # EXE HEADER # # #
 string "PS-X EXE"
@@ -119,20 +178,49 @@ $bytes = []
 
 
 # # # PROGRAM CODE # # #
-nop ; jmp $base_addr + 16 ; nop ; word 0xdeadbeef
+nop
 
 # ops should always be in format of
 # src [args] -> dest
 
-lui $gp0 >> 16, 1
+# THIS IS NEEDED
-ori 1, $gp0, 1
+lwi $gp1, t0
+lwi 0x03_00_00_00, t1 # display enable
+sw t1, 0, t0
+
+lwi $gp0, t0
+
+lwi 0xe1_000000 + 0b0_0_0_1_0_01_00_0_0000, t1
+sw t1, 0, t0
+
+# THIS IS NEEDED
+lwi 0xe4_000000 + (640) + (480 << 10), t1 # Drawing Area bottom right
+sw t1, 0, t0
+
+def line(st, en)
+	lwi 0x40_ffffff, t1 # monochrome line, color ffffff
+	sw t1, 0, t0
+
+	lwi st, t1 # line vert 1
+	sw t1, 0, t0
+
+	lwi en, t1 # line vert 2
+	sw t1, 0, t0
+end
+
+l_end_loop = label
+line 0x0010_0010, 0x0030_0030
+line 0x0030_0030, 0x0060_0000
+line 0x0060_0000, 0x00f0_0060
 
 nop ; nop ; nop ; nop
 nop ; nop ; nop ; nop
 nop ; nop ; nop ; nop
 nop ; nop ; nop ; nop
 
-jmp $base_addr
+# l_end_loop = label
+nop
+jmp l_end_loop
 nop