65 lines
1.3 KiB
NASM
65 lines
1.3 KiB
NASM
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; FXF launcher helper routines
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; launch an FXF binary from a file name
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; inputs:
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; r0: pointer to FXF binary name
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; outputs:
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; none
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launch_fxf:
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push r0
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push r1
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push r2
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push r3
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push r4
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; open the file
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mov r1, 0
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mov r2, launch_fxf_struct
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call open
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cmp r0, 0
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ifz jmp allocate_error
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; allocate memory for the binary
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mov r0, launch_fxf_struct
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call ryfs_get_size
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call allocate_memory
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cmp r0, 0
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ifz jmp allocate_error
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mov [launch_fxf_binary_ptr], r0
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; read the file into memory
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mov r0, launch_fxf_struct
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mov r1, [launch_fxf_binary_ptr]
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call ryfs_read_whole_file
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; allocate a 64KiB stack
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mov r0, 65536
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call allocate_memory
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cmp r0, 0
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ifz jmp allocate_error
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mov [launch_fxf_stack_ptr], r0
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; relocate the binary
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mov r0, [launch_fxf_binary_ptr]
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call parse_fxf_binary
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; create a new task
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mov r1, r0
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call get_unused_task_id
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mov r2, [launch_fxf_stack_ptr]
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add r2, 65516 ; point to the end of the stack (stack grows down!!)
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mov r3, [launch_fxf_binary_ptr]
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mov r4, [launch_fxf_stack_ptr]
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call new_task
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allocate_error:
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pop r4
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pop r3
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pop r2
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pop r1
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pop r0
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ret
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launch_fxf_struct: data.fill 0, 8
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launch_fxf_binary_ptr: data.32 0
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launch_fxf_stack_ptr: data.32 0
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