3ecaa3afa5
commit 18bba1843fc7f264f58c9345d00827d082f9c558 upstream.
Add the missing #include of asm/assembler.h, which is where the ldr_l
macro is defined.
Bug: 260821414
Fixes: ff7a167961d1b97e ("arm64: efi: Execute runtime services from a dedicated stack")
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Lee Jones <lee@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I50d1e21277ef64dcb1d58d7f1c062dc913cfee74
(cherry picked from commit dd8418a59a40ac8bda0f3a23a8f3fae439d0cc9e)
61 lines
1.4 KiB
ArmAsm
61 lines
1.4 KiB
ArmAsm
/*
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* Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.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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ldr_l x16, efi_rt_stack_top
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mov sp, x16
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#ifdef CONFIG_SHADOW_CALL_STACK
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str x18, [sp, #-16]!
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#endif
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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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mov sp, x29
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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:
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/*
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* Restore x18 before returning to instrumented code. This is
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* safe because the wrapper is called with preemption disabled and
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* a separate shadow stack is used for interrupts.
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*/
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#ifdef CONFIG_SHADOW_CALL_STACK
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ldr_l x18, efi_rt_stack_top
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ldr x18, [x18, #-16]
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#endif
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b efi_handle_corrupted_x18 // tail call
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ENDPROC(__efi_rt_asm_wrapper)
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