hellogpu wip pre-clear screen exercise

code/graphics_system/dsl.s

@@ -0,0 +1,44 @@
+; Symbol Alias Table
+
+; Instructions
+; Load
+load_imm   equ li  ; dst_reg, immeidate value (signed)
+load_uimm  equ lui ; dst_reg, immediate value (unsigned)
+; Store
+store_word equ sw ; src_reg, dst_address 
+; Addition
+add_s  equ add   ; dst_reg, reg_a, reg_b (signed)
+add_u  equ add   ; dst_reg, reg_a, reg_b (unsigned)
+add_si equ addi  ; dst_reg, src_reg, immediate value (signed)
+add_ui equ addiu ; dst_reg, src_reg, immediate value (unsigned)
+; Subtraction
+sub_s equ sub    ; 
+sub_u equ subu   ; 
+; Branch
+branch_equal    equ beq ; reg, value(reg, immediate), dst_label
+branch_gt_equal equ bge ; reg, value(reg, immediate), dst_label
+branch_gt       equ bgt ; reg, value(reg, immediate), dst_label
+branch_lt       equ blt ; reg, value(reg, immediate), dst_label
+; Jump
+jump       equ j   ; address:    immediate
+jump_nlink equ jal ; subroutine: immeidate
+jump_reg   equ jr  ; address:    register
+jump_nreg  equ jrl ; subroutine: register
+
+; Registers
+; Temporaries, may be changed by subroutines
+rtmp_0 equ $t0
+rtmp_1 equ $t1
+rtmp_2 equ $t2
+rtmp_3 equ $t3
+rtmp_4 equ $t4
+; Subroutine arguments
+rarg_0 equ $a0
+rarg_1 equ $a1
+rarg_2 equ $a2
+rarg_3 equ $a3
+; Subroutine return values
+rret_0 equ $v0
+rret_1 equ $v1
+; Subroutine return address when doing a sub
+rret_addr equ $ra