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45 lines
1.0 KiB
ArmAsm
45 lines
1.0 KiB
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 <AsmMacroIoLib.h>
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.arch_extension sec
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ASM_FUNC(ArmCallSmc)
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push {r4-r8}
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// r0 will be popped just after the SMC call
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push {r0}
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// Load the SMC 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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smc #0
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// Pop the ARM_SMC_ARGS structure address from the stack into r8
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pop {r8}
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// Load the SMC returned values into the appropriate registers
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// A SMC 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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