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33 lines
798 B
ArmAsm
33 lines
798 B
ArmAsm
//
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// Copyright (c) 2012-2014, ARM 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 <AsmMacroIoLibV8.h>
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ASM_FUNC(ArmCallSmc)
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// Push x0 on the stack - The stack must always be quad-word aligned
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str x0, [sp, #-16]!
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// Load the SMC arguments values into the appropriate registers
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ldp x6, x7, [x0, #48]
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ldp x4, x5, [x0, #32]
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ldp x2, x3, [x0, #16]
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ldp x0, x1, [x0, #0]
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smc #0
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// Pop the ARM_SMC_ARGS structure address from the stack into x9
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ldr x9, [sp], #16
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// Store the SMC returned values into the ARM_SMC_ARGS structure.
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// A SMC call can return up to 4 values - we do not need to store back x4-x7.
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stp x2, x3, [x9, #16]
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stp x0, x1, [x9, #0]
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mov x0, x9
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ret
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