fox32os/kernel/fxf/launch.asm

149 lines
3.3 KiB
NASM

; FXF launching routines
; launch an FXF binary from an already opened file
; inputs:
; r0: pointer to file struct
; r1: reserved
; r2: argument 0
; r3: argument 1
; r4: argument 2
; r5: argument 3
; r6: argument 4
; outputs:
; r0: task ID of the new task, or 0xFFFFFFFF if error
launch_fxf_from_open_file:
push r1
push r2
push r3
push r4
push r5
push r6
push r2
push r3
push r4
push r5
push r6
mov [launch_fxf_struct_ptr], r0
jmp launch_fxf_from_open_file_1
; launch an FXF binary from a file on disk
; inputs:
; r0: pointer to FXF binary name (8.3 format, for example "testfile.fxf" or "test.fxf")
; r1: disk ID
; r2: argument 0
; r3: argument 1
; r4: argument 2
; r5: argument 3
; r6: argument 4
; outputs:
; r0: task ID of the new task, or 0xFFFFFFFF if error
launch_fxf_from_disk:
push r1
push r2
push r3
push r4
push r5
push r6
push r2
push r3
push r4
push r5
push r6
; open the file
mov [launch_fxf_struct_ptr], launch_fxf_struct
mov r2, [launch_fxf_struct_ptr]
call open
cmp r0, 0
ifz jmp launch_fxf_from_disk_file_error
launch_fxf_from_open_file_1:
; allocate memory for the binary
mov r0, [launch_fxf_struct_ptr]
call get_size
call allocate_memory
cmp r0, 0
ifz jmp launch_fxf_from_disk_allocate_error
mov [launch_fxf_binary_ptr], r0
; read the file into memory
mov r0, [launch_fxf_struct_ptr]
mov r1, [launch_fxf_binary_ptr]
call ryfs_read_whole_file
; allocate a 64KiB stack
mov r0, 65536
call allocate_memory
cmp r0, 0
ifz jmp launch_fxf_from_disk_allocate_error
mov [launch_fxf_stack_ptr], r0
; push the arguments to the task's stack
pop r4
pop r3
pop r2
pop r1
pop r0
mov r5, rsp
mov rsp, [launch_fxf_stack_ptr]
add rsp, 65536 ; point to the end of the stack (stack grows down!!)
push r4
push r3
push r2
push r1
push r0
sub rsp, 65516
mov [launch_fxf_stack_ptr], rsp
mov rsp, r5
; relocate the binary
mov r0, [launch_fxf_binary_ptr]
call parse_fxf_binary
; create a new task
mov r1, r0
call get_unused_task_id
mov.8 [launch_fxf_task_id], r0
mov r2, [launch_fxf_stack_ptr]
add r2, 65516 ; point to the end of the stack (stack grows down!!)
mov r3, [launch_fxf_binary_ptr]
mov r4, [launch_fxf_stack_ptr]
call new_task
pop r6
pop r5
pop r4
pop r3
pop r2
pop r1
movz.8 r0, [launch_fxf_task_id]
ret
launch_fxf_from_disk_allocate_error:
mov r0, launch_fxf_allocate_error_string1
mov r1, launch_fxf_allocate_error_string2
mov r2, launch_fxf_allocate_error_string3
mov r3, 64
mov r4, 64
mov r5, 336
call new_messagebox
launch_fxf_from_disk_file_error:
pop r6
pop r5
pop r4
pop r3
pop r2
pop r1
mov r0, 0xFFFFFFFF
ret
launch_fxf_struct_ptr: data.32 0
launch_fxf_struct: data.fill 0, 32
launch_fxf_task_id: data.8 0
launch_fxf_binary_ptr: data.32 0
launch_fxf_stack_ptr: data.32 0
launch_fxf_allocate_error_string1: data.strz "Failed to allocate memory for a new task"
launch_fxf_allocate_error_string2: data.strz "The memory allocator seems to be in an"
launch_fxf_allocate_error_string3: data.strz "invalid state, a reboot is recommended"