tasks: Initial commit

applications/tasks/main.asm

@@ -0,0 +1,137 @@
+; print task info to the terminal
+
+    pop [stream_ptr]
+
+    mov r0, header
+    call print
+
+    call get_task_queue
+    mov r10, r0
+    mov r31, r1
+task_loop:
+    ; r10: pointer to this task entry
+    ; r2: size of each task entry in bytes
+
+    ; task ID
+    cmp [r10], 10
+    iflt mov r0, space
+    iflt call print
+    mov r0, [r10]
+    call print_dec
+    mov r0, separator
+    call print
+
+    ; rip value
+    mov r0, [r10+4]
+    call print_hex
+    mov r0, separator2
+    call print
+
+    ; rsp value
+    mov r0, [r10+8]
+    call print_hex
+    mov r0, separator2
+    call print
+
+    ; base address
+    mov r0, [r10+12]
+    call print_hex
+    mov r0, nl
+    call print
+
+    add r10, r2
+
+    loop task_loop
+    call end_current_task
+
+separator2: data.str " "
+separator: data.strz " | "
+space: data.strz " "
+header: data.str "ID | rip value | rsp value | base addr" nl: data.8 10 data.8 0
+
+print:
+    push r0
+    push r1
+    push r2
+
+    mov r2, r0            ; r2: source buffer
+    call string_length    ; r0: length
+    mov r1, [stream_ptr]  ; r1: stream pointer
+    call write
+
+    pop r2
+    pop r1
+    pop r0
+    ret
+
+print_hex:
+    push r0
+    push r1
+    push r2
+    push r10
+    push r11
+    push r12
+    push r31
+
+    mov r10, r0
+    mov r31, 8
+print_hex_loop:
+    rol r10, 4
+    movz.16 r11, r10
+    and r11, 0x0F
+    mov r12, hex_chars
+    add r12, r11
+    movz.8 r0, [r12]
+    push.8 r0
+    mov r2, rsp
+    mov r0, 1
+    mov r1, [stream_ptr]
+    call write
+    inc rsp
+    loop print_hex_loop
+
+    pop r31
+    pop r12
+    pop r11
+    pop r10
+    pop r2
+    pop r1
+    pop r0
+    ret
+hex_chars: data.str "0123456789ABCDEF"
+
+print_dec:
+    push r0
+    push r10
+    push r11
+    push r12
+    push r13
+    mov r10, rsp
+    mov r12, r0
+
+    push.8 0
+print_dec_loop:
+    push r12
+    div r12, 10
+    pop r13
+    rem r13, 10
+    mov r11, r13
+    add r11, '0'
+    push.8 r11
+    cmp r12, 0
+    ifnz jmp print_dec_loop
+    mov r0, rsp
+    call print
+
+    mov rsp, r10
+    pop r13
+    pop r12
+    pop r11
+    pop r10
+    pop r0
+    ret
+
+stream_ptr: data.32 0
+
+    #include "../../../fox32rom/fox32rom.def"
+    #include "../../../fox32os/fox32os.def"