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AREA switch_arm64_masm, CODE, READONLY;
GLOBAL slp_switch [FUNC]
EXTERN slp_save_state_asm
EXTERN slp_restore_state_asm
slp_switch
; push callee saved registers to stack
stp x19, x20, [sp, #-16]!
stp x21, x22, [sp, #-16]!
stp x23, x24, [sp, #-16]!
stp x25, x26, [sp, #-16]!
stp x27, x28, [sp, #-16]!
stp x29, x30, [sp, #-16]!
stp d8, d9, [sp, #-16]!
stp d10, d11, [sp, #-16]!
stp d12, d13, [sp, #-16]!
stp d14, d15, [sp, #-16]!
; call slp_save_state_asm with stack pointer
mov x0, sp
bl slp_save_state_asm
; early return for return value of 1 and -1
cmp x0, #-1
b.eq RETURN
cmp x0, #1
b.eq RETURN
; increment stack and frame pointer
add sp, sp, x0
add x29, x29, x0
bl slp_restore_state_asm
; store return value for successful completion of routine
mov x0, #0
RETURN
; pop registers from stack
ldp d14, d15, [sp], #16
ldp d12, d13, [sp], #16
ldp d10, d11, [sp], #16
ldp d8, d9, [sp], #16
ldp x29, x30, [sp], #16
ldp x27, x28, [sp], #16
ldp x25, x26, [sp], #16
ldp x23, x24, [sp], #16
ldp x21, x22, [sp], #16
ldp x19, x20, [sp], #16
ret
END
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