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46 lines
1.1 KiB
ArmAsm
46 lines
1.1 KiB
ArmAsm
//
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// Copyright (c) 2012-2014, ARM Limited. All rights reserved.
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// Copyright (c) 2014-2016, Linaro Limited. All rights reserved.
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//
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// SPDX-License-Identifier: BSD-2-Clause-Patent
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//
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//
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#include <AsmMacroIoLib.h>
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.arch_extension virt
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ASM_FUNC(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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