mirror of https://github.com/acidanthera/audk.git
54 lines
1.5 KiB
NASM
54 lines
1.5 KiB
NASM
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//
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// Copyright (c) 2012-2014, ARM Limited. All rights reserved.
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// Copyright (c) 2014, Linaro Limited. All rights reserved.
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//
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// This program and the accompanying materials
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// are licensed and made available under the terms and conditions of the BSD License
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// which accompanies this distribution. The full text of the license may be found at
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// http://opensource.org/licenses/bsd-license.php
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//
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// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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//
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//
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EXPORT ArmCallHvc
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AREA ArmHvc, CODE, READONLY
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ArmCallHvc
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push {r4-r8}
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// r0 will be popped just after the HVC call
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push {r0}
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// Load the HVC arguments values into the appropriate registers
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ldr r7, [r0, #28]
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ldr r6, [r0, #24]
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ldr r5, [r0, #20]
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ldr r4, [r0, #16]
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ldr r3, [r0, #12]
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ldr r2, [r0, #8]
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ldr r1, [r0, #4]
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ldr r0, [r0, #0]
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hvc #0
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// Pop the ARM_HVC_ARGS structure address from the stack into r8
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pop {r8}
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// Load the HVC returned values into the appropriate registers
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// A HVC call can return up to 4 values - we do not need to store back r4-r7.
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str r3, [r8, #12]
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str r2, [r8, #8]
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str r1, [r8, #4]
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str r0, [r8, #0]
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mov r0, r8
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// Restore the registers r4-r8
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pop {r4-r8}
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bx lr
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END
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