fb7ea6114a
From the AArch64 Procedure Call Standard (ARM IHI 0055B): 5.2.2.1 Universal stack constraints At all times the following basic constraints must hold: - SP mod 16 = 0. The stack must be quad-word aligned. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Olivier Martin <olivier.martin@arm.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16327 6f19259b-4bc3-4df7-8a09-765794883524
43 lines
1.2 KiB
ArmAsm
43 lines
1.2 KiB
ArmAsm
//
|
|
// Copyright (c) 2012-2014, ARM Limited. All rights reserved.
|
|
// Copyright (c) 2014, Linaro Limited. All rights reserved.
|
|
//
|
|
// This program and the accompanying materials
|
|
// are licensed and made available under the terms and conditions of the BSD License
|
|
// which accompanies this distribution. The full text of the license may be found at
|
|
// http://opensource.org/licenses/bsd-license.php
|
|
//
|
|
// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
//
|
|
//
|
|
|
|
.text
|
|
.align 3
|
|
|
|
GCC_ASM_EXPORT(ArmCallHvc)
|
|
|
|
ASM_PFX(ArmCallHvc):
|
|
// Push x0 on the stack - The stack must always be quad-word aligned
|
|
str x0, [sp, #-16]!
|
|
|
|
// Load the HVC arguments values into the appropriate registers
|
|
ldp x6, x7, [x0, #48]
|
|
ldp x4, x5, [x0, #32]
|
|
ldp x2, x3, [x0, #16]
|
|
ldp x0, x1, [x0, #0]
|
|
|
|
hvc #0
|
|
|
|
// Pop the ARM_HVC_ARGS structure address from the stack into x9
|
|
ldr x9, [sp], #16
|
|
|
|
// Store the HVC returned values into the ARM_HVC_ARGS structure.
|
|
// A HVC call can return up to 4 values
|
|
stp x2, x3, [x9, #16]
|
|
stp x0, x1, [x9, #0]
|
|
|
|
mov x0, x9
|
|
|
|
ret
|