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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
|
|
