attempts at warmup exercises.

code/warmup/exercise1.s

@@ -1,56 +0,0 @@
-.psx
-.create "exercise1.bin", 0x80010000
-
-; Entry Point of Code
-.org 0x80010000
-
-; Constant declaration
-BASE_ADDR equ 0x0000
-
-
-; Symbol Alias Table
-
-; Instructions
-load_imm equ li
-
-; Registers
-rtemp_0 equ $t0
-rtemp_1 equ $t1
-rtemp_2 equ $t2
-
-.macro test,dst_reg,value
-	li dst_reg,value
-.endmacro
-
-.macro test2,reg
-	li reg,0xA000
-.endmacro
-
-.macro myli,dest,value
-   .if value & ~0xFFFF
-      ori   dest,r0,value
-   .elseif (value & 0xFFFF8000) == 0xFFFF8000
-      addiu dest,r0,value & 0xFFFF
-   .elseif (value & 0xFFFF) == 0
-      lui   dest,value >> 16
-   .else
-      lui   dest,value >> 16 + (value & 0x8000 != 0)
-      addiu dest,dest,value & 0xFFFF
-   .endif
-.endmacro
-
-.macro store_word, src_reg, dst_address
-	sw src_reg, dst_address
-.endmacro
-
-Main:
-	myli $t0, 0xA000
-	li rtemp_1, 0xA100     ; $t1 = 0xA100
-	li rtemp_2, 0x11111111 ; $t2 = 0x11111111
-
-Loop:
-	sw   $t2, BASE_ADDR($t0) ; Store byte at 0x0000 + t0
-	addi $t0, $t0, 4         ; ++ t0
-	blt  $t0, $t1, Loop      ; while (t0 < t1) keep looping
-
-.close

code/warmup/exercise_1.s

@@ -0,0 +1,32 @@
+.psx
+.create "exercise_1.bin", 0x80010000
+
+; Entry Point of Code
+.org 0x80010000
+
+; Constant declaration
+BASE_ADDR equ 0x0000
+
+; Symbol Alias Table
+
+; Instructions
+load_imm   equ li ; dst_reg, immeidate value
+store_word equ sw ; src_reg, dst_address 
+
+; Registers
+rtemp_0 equ $t0
+rtemp_1 equ $t1
+rtemp_2 equ $t2
+
+main:
+	; TODO:
+	;	1. Load $t0 with the immediate decimal value of 1
+	;	2. Load $t1 with the immediate decimal value of 256
+	;	3. Load $t2 with the immediate decimal value of 17
+
+	; Attempt:
+	load_imm rtemp_0, 1
+	load_imm rtemp_1, 256
+	load_imm rtemp_2, 17
+end:
+.close

code/warmup/exercise_2.s

@@ -0,0 +1,47 @@
+.psx
+.create "exercise_2.bin", 0x80010000
+
+; Entry Point of Code
+.org 0x80010000
+
+; Constant declaration
+BASE_ADDR equ 0x0000
+
+; Symbol Alias Table
+
+; Instructions
+; Load
+load_imm   equ li ; dst_reg, immeidate value
+; 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)
+; Branch
+branch_equal equ beq ; reg, value(reg, immediate), dst_label
+
+; Registers
+; Temporaries, may be changed by subroutines
+rtemp_0 equ $t0
+rtemp_1 equ $t1
+rtemp_2 equ $t2
+
+main:
+	; TODO:
+	;	1. Start $t0 with the value 1 and $t1 with the value 0
+	;	2. Loop, incrementing $t0 until it reaches the value 10
+	;	3. Keep adding and accumulating all values of $t0 inside $t1
+
+	; Attempt:
+	load_imm rtemp_0, 1
+	load_imm rtemp_1, 0
+loop:
+	add_s        rtemp_1, rtemp_1, rtemp_0
+	add_si       rtemp_0, rtemp_0, 1
+	branch_equal rtemp_0, 10, end
+	nop
+	j            loop
+end:
+.close

code/warmup/exercise_3.s

@@ -0,0 +1,68 @@
+.psx
+.create "exercise_3.bin", 0x80010000
+
+; Entry Point of Code
+.org 0x80010000
+
+; Constant declaration
+BASE_ADDR equ 0x0000
+
+; Symbol Alias Table
+
+; Instructions
+; Load
+load_imm   equ li ; dst_reg, immeidate value
+; 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_lt       equ blt ; reg, value(reg, immediate), dst_label
+
+; Registers
+; Temporaries, may be changed by subroutines
+rtemp_0 equ $t0
+rtemp_1 equ $t1
+rtemp_2 equ $t2
+
+; /* C code: */
+; main() {
+;  int num;  // Assume num is loaded in $t0
+;  int den;  // Assume den is loaded in $t1
+;  int res;  // Assume res is loaded in $t2
+;  num = 27; // Or any other number that we want
+;  den = 3;  // Or any other number that we want
+;  res = 0;
+;  while (num >= den) {
+;  num -= den;
+;  res++;
+;  }
+; }
+
+main:
+; TODO:
+; 1. Initialize $t0 to 27 (or any other value)
+; 2. Initialize $t1 to 3 (or any other value)
+; 3. Initialize $t2 (res) with 0
+; 4. While ($t0 >= $t1) {
+; 5. Subtract $t0-$t1 and store it back into $t0
+; 6. Increment $t2
+; 7. }
+
+; Attempt:
+	load_imm rtemp_0, 27
+	load_imm rtemp_1, 3
+	load_imm rtemp_2, 0
+	loop: :: branch_lt rtemp_0, rtemp_1, loop_break :: nop ; loop if < rtemp_0, rtemp_1 {
+		sub_s  rtemp_0, rtemp_0, rtemp_1                   ; 	-= rtemp_0, rtemp_1
+		add_si rtemp_2, rtemp_2, 1                         ;    ++ rtemp_2
+	j loop :: loop_break:                                  ; }
+.close

docs/readme.md

@@ -0,0 +1,3 @@
+# Docs
+
+[psx-spx: Playstation Specifications](https://psx-spx.consoledev.net)

scripts/build.ps1

@@ -33,4 +33,6 @@ function build-program { param(
 	pop-location
 }
 # build-program 'fillmem' 'fillmem'
-build-program 'warmup' 'exercise1'
+# build-program 'warmup' 'exercise_1'
+# build-program 'warmup' 'exercise_2'
+build-program 'warmup' 'exercise_3'