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| author | Supreeth Venkatesh <supreeth.venkatesh@arm.com> | 2017-09-20 20:48:11 +0100 |
|---|---|---|
| committer | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2017-10-06 22:35:41 +0100 |
| commit | f8f0e454e1f9e0be354cfab2b70d4faa14982f6f (patch) | |
| tree | 5e8e62414b25aab801c2368bdabdb68061bc2c2c /ArmPkg/Library/ArmSvcLib/AArch64 | |
| parent | 4d163696f23dc552b30c2a21cc5e5b7d201c7946 (diff) | |
| download | edk2-f8f0e454e1f9e0be354cfab2b70d4faa14982f6f.tar.gz edk2-f8f0e454e1f9e0be354cfab2b70d4faa14982f6f.tar.bz2 edk2-f8f0e454e1f9e0be354cfab2b70d4faa14982f6f.zip | |
ArmPkg/ArmSvcLib: Add ArmSvcLib implementation.
This patch adds a library that enables invocation of SVCs from Exception
Level EL0. It will be used by the Standalone MM environment to request
services from a software running in a privileged EL e.g. ARM Trusted
Firmware. The library is derived directly from Arm SMC Library.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Achin Gupta <achin.gupta@arm.com>
Signed-off-by: Supreeth Venkatesh <supreeth.venkatesh@arm.com>
[ardb: assign frame pointer (AArch64)
keep stack alignment (ARM)]
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Diffstat (limited to 'ArmPkg/Library/ArmSvcLib/AArch64')
| -rw-r--r-- | ArmPkg/Library/ArmSvcLib/AArch64/ArmSvc.S | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/ArmPkg/Library/ArmSvcLib/AArch64/ArmSvc.S b/ArmPkg/Library/ArmSvcLib/AArch64/ArmSvc.S new file mode 100644 index 0000000000..7b8e4a965b --- /dev/null +++ b/ArmPkg/Library/ArmSvcLib/AArch64/ArmSvc.S @@ -0,0 +1,46 @@ +//
+// Copyright (c) 2012 - 2017, ARM 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(ArmCallSvc)
+
+ASM_PFX(ArmCallSvc):
+ // Push frame pointer and return address on the stack
+ stp x29, x30, [sp, #-32]!
+ mov x29, sp
+
+ // Push x0 on the stack - The stack must always be quad-word aligned
+ str x0, [sp, #16]
+
+ // Load the SVC 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]
+
+ svc #0
+
+ // Pop the ARM_SVC_ARGS structure address from the stack into x9
+ ldr x9, [sp, #16]
+
+ // Store the SVC returned values into the ARM_SVC_ARGS structure.
+ // A SVC call can return up to 4 values - we do not need to store back x4-x7.
+ stp x0, x1, [x9, #0]
+ stp x2, x3, [x9, #16]
+
+ mov x0, x9
+
+ ldp x29, x30, [sp], #32
+ ret
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