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https://github.com/Ed94/pikuma_ps1.git
synced 2026-06-01 18:41:13 -07:00
attempts at warmup exercises.
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@@ -1,56 +0,0 @@
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.psx
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.create "exercise1.bin", 0x80010000
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; Entry Point of Code
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.org 0x80010000
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; Constant declaration
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BASE_ADDR equ 0x0000
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; Symbol Alias Table
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; Instructions
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load_imm equ li
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; Registers
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rtemp_0 equ $t0
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rtemp_1 equ $t1
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rtemp_2 equ $t2
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.macro test,dst_reg,value
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li dst_reg,value
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.endmacro
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.macro test2,reg
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li reg,0xA000
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.endmacro
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.macro myli,dest,value
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.if value & ~0xFFFF
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ori dest,r0,value
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.elseif (value & 0xFFFF8000) == 0xFFFF8000
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addiu dest,r0,value & 0xFFFF
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.elseif (value & 0xFFFF) == 0
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lui dest,value >> 16
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.else
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lui dest,value >> 16 + (value & 0x8000 != 0)
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addiu dest,dest,value & 0xFFFF
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.endif
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.endmacro
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.macro store_word, src_reg, dst_address
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sw src_reg, dst_address
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.endmacro
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Main:
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myli $t0, 0xA000
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li rtemp_1, 0xA100 ; $t1 = 0xA100
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li rtemp_2, 0x11111111 ; $t2 = 0x11111111
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Loop:
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sw $t2, BASE_ADDR($t0) ; Store byte at 0x0000 + t0
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addi $t0, $t0, 4 ; ++ t0
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blt $t0, $t1, Loop ; while (t0 < t1) keep looping
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.close
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@@ -0,0 +1,32 @@
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.psx
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.create "exercise_1.bin", 0x80010000
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; Entry Point of Code
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.org 0x80010000
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; Constant declaration
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BASE_ADDR equ 0x0000
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; Symbol Alias Table
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; Instructions
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load_imm equ li ; dst_reg, immeidate value
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store_word equ sw ; src_reg, dst_address
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; Registers
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rtemp_0 equ $t0
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rtemp_1 equ $t1
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rtemp_2 equ $t2
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main:
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; TODO:
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; 1. Load $t0 with the immediate decimal value of 1
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; 2. Load $t1 with the immediate decimal value of 256
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; 3. Load $t2 with the immediate decimal value of 17
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; Attempt:
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load_imm rtemp_0, 1
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load_imm rtemp_1, 256
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load_imm rtemp_2, 17
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end:
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.close
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@@ -0,0 +1,47 @@
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.psx
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.create "exercise_2.bin", 0x80010000
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; Entry Point of Code
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.org 0x80010000
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; Constant declaration
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BASE_ADDR equ 0x0000
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; Symbol Alias Table
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; Instructions
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; Load
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load_imm equ li ; dst_reg, immeidate value
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; Store
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store_word equ sw ; src_reg, dst_address
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; Addition
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add_s equ add ; dst_reg, reg_a, reg_b (signed)
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add_u equ add ; dst_reg, reg_a, reg_b (unsigned)
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add_si equ addi ; dst_reg, src_reg, immediate value (signed)
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add_ui equ addiu ; dst_reg, src_reg, immediate value (unsigned)
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; Branch
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branch_equal equ beq ; reg, value(reg, immediate), dst_label
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; Registers
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; Temporaries, may be changed by subroutines
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rtemp_0 equ $t0
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rtemp_1 equ $t1
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rtemp_2 equ $t2
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main:
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; TODO:
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; 1. Start $t0 with the value 1 and $t1 with the value 0
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; 2. Loop, incrementing $t0 until it reaches the value 10
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; 3. Keep adding and accumulating all values of $t0 inside $t1
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; Attempt:
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load_imm rtemp_0, 1
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load_imm rtemp_1, 0
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loop:
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add_s rtemp_1, rtemp_1, rtemp_0
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add_si rtemp_0, rtemp_0, 1
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branch_equal rtemp_0, 10, end
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nop
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j loop
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end:
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.close
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@@ -0,0 +1,68 @@
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.psx
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.create "exercise_3.bin", 0x80010000
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; Entry Point of Code
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.org 0x80010000
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; Constant declaration
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BASE_ADDR equ 0x0000
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; Symbol Alias Table
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; Instructions
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; Load
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load_imm equ li ; dst_reg, immeidate value
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; Store
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store_word equ sw ; src_reg, dst_address
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; Addition
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add_s equ add ; dst_reg, reg_a, reg_b (signed)
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add_u equ add ; dst_reg, reg_a, reg_b (unsigned)
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add_si equ addi ; dst_reg, src_reg, immediate value (signed)
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add_ui equ addiu ; dst_reg, src_reg, immediate value (unsigned)
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; Subtraction
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sub_s equ sub ;
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sub_u equ subu ;
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; Branch
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branch_equal equ beq ; reg, value(reg, immediate), dst_label
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branch_gt_equal equ bge ; reg, value(reg, immediate), dst_label
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branch_lt equ blt ; reg, value(reg, immediate), dst_label
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; Registers
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; Temporaries, may be changed by subroutines
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rtemp_0 equ $t0
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rtemp_1 equ $t1
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rtemp_2 equ $t2
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; /* C code: */
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; main() {
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; int num; // Assume num is loaded in $t0
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; int den; // Assume den is loaded in $t1
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; int res; // Assume res is loaded in $t2
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; num = 27; // Or any other number that we want
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; den = 3; // Or any other number that we want
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; res = 0;
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; while (num >= den) {
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; num -= den;
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; res++;
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; }
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; }
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main:
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; TODO:
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; 1. Initialize $t0 to 27 (or any other value)
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; 2. Initialize $t1 to 3 (or any other value)
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; 3. Initialize $t2 (res) with 0
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; 4. While ($t0 >= $t1) {
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; 5. Subtract $t0-$t1 and store it back into $t0
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; 6. Increment $t2
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; 7. }
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; Attempt:
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load_imm rtemp_0, 27
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load_imm rtemp_1, 3
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load_imm rtemp_2, 0
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loop: :: branch_lt rtemp_0, rtemp_1, loop_break :: nop ; loop if < rtemp_0, rtemp_1 {
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sub_s rtemp_0, rtemp_0, rtemp_1 ; -= rtemp_0, rtemp_1
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add_si rtemp_2, rtemp_2, 1 ; ++ rtemp_2
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j loop :: loop_break: ; }
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.close
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@@ -0,0 +1,3 @@
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# Docs
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[psx-spx: Playstation Specifications](https://psx-spx.consoledev.net)
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+3
-1
@@ -33,4 +33,6 @@ function build-program { param(
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pop-location
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}
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# build-program 'fillmem' 'fillmem'
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build-program 'warmup' 'exercise1'
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# build-program 'warmup' 'exercise_1'
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# build-program 'warmup' 'exercise_2'
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build-program 'warmup' 'exercise_3'
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