0343a7e463
In an effort to clarify and simplify the annotation of assembly functions in the kernel new macros have been introduced. These replace ENTRY and ENDPROC and also add a new annotation for static functions which previously had no ENTRY equivalent. Update the annotations in the core kernel code to the new macros. Signed-off-by: Mark Brown <broonie@kernel.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Link: https://lore.kernel.org/r/20200501115430.37315-3-broonie@kernel.org Signed-off-by: Will Deacon <will@kernel.org>
39 lines
828 B
ArmAsm
39 lines
828 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
SYM_FUNC_START(__efi_rt_asm_wrapper)
|
|
stp x29, x30, [sp, #-32]!
|
|
mov x29, sp
|
|
|
|
/*
|
|
* Register x18 is designated as the 'platform' register by the AAPCS,
|
|
* which means firmware running at the same exception level as the OS
|
|
* (such as UEFI) should never touch it.
|
|
*/
|
|
stp x1, x18, [sp, #16]
|
|
|
|
/*
|
|
* We are lucky enough that no EFI runtime services take more than
|
|
* 5 arguments, so all are passed in registers rather than via the
|
|
* stack.
|
|
*/
|
|
mov x8, x0
|
|
mov x0, x2
|
|
mov x1, x3
|
|
mov x2, x4
|
|
mov x3, x5
|
|
mov x4, x6
|
|
blr x8
|
|
|
|
ldp x1, x2, [sp, #16]
|
|
cmp x2, x18
|
|
ldp x29, x30, [sp], #32
|
|
b.ne 0f
|
|
ret
|
|
0: b efi_handle_corrupted_x18 // tail call
|
|
SYM_FUNC_END(__efi_rt_asm_wrapper)
|