Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) SYM_FUNC_START(__efi_rt_asm_wrapper)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 	stp	x29, x30, [sp, #-32]!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	mov	x29, sp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 	 * Register x18 is designated as the 'platform' register by the AAPCS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 	 * which means firmware running at the same exception level as the OS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	 * (such as UEFI) should never touch it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	stp	x1, x18, [sp, #16]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	 * We are lucky enough that no EFI runtime services take more than
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	 * 5 arguments, so all are passed in registers rather than via the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	 * stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	mov	x8, x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	mov	x0, x2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	mov	x1, x3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	mov	x2, x4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	mov	x3, x5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	mov	x4, x6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	blr	x8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	ldp	x1, x2, [sp, #16]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	cmp	x2, x18
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	ldp	x29, x30, [sp], #32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	b.ne	0f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	ret
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	 * With CONFIG_SHADOW_CALL_STACK, the kernel uses x18 to store a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	 * shadow stack pointer, which we need to restore before returning to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	 * potentially instrumented code. This is safe because the wrapper is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	 * called with preemption disabled and a separate shadow stack is used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	 * for interrupts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	mov	x18, x2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	b	efi_handle_corrupted_x18	// tail call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) SYM_FUNC_END(__efi_rt_asm_wrapper)