2019-06-04 16:11:33 +08:00
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/* SPDX-License-Identifier: GPL-2.0-only */
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2018-03-08 16:00:13 +08:00
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/*
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* Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
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*/
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#include <linux/linkage.h>
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ENTRY(__efi_rt_asm_wrapper)
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stp x29, x30, [sp, #-32]!
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mov x29, sp
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/*
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* Register x18 is designated as the 'platform' register by the AAPCS,
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* which means firmware running at the same exception level as the OS
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* (such as UEFI) should never touch it.
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*/
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stp x1, x18, [sp, #16]
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/*
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* We are lucky enough that no EFI runtime services take more than
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* 5 arguments, so all are passed in registers rather than via the
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* stack.
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*/
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mov x8, x0
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mov x0, x2
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mov x1, x3
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mov x2, x4
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mov x3, x5
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mov x4, x6
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blr x8
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ldp x1, x2, [sp, #16]
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cmp x2, x18
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ldp x29, x30, [sp], #32
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b.ne 0f
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ret
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0: b efi_handle_corrupted_x18 // tail call
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ENDPROC(__efi_rt_asm_wrapper)
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