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//
// Copyright (c) 2016 - 2017, ARM Limited. All rights reserved.
//
// SPDX-License-Identifier: BSD-2-Clause-Patent
//
//
.text
.align 3
GCC_ASM_EXPORT(ArmCallSvc)
ASM_PFX(ArmCallSvc):
// r0 will be popped just after the SVC call
push {r0, r4-r8}
// Load the SVC arguments values into the appropriate registers
ldm r0, {r0-r7}
svc #0
// Load the ARM_SVC_ARGS structure address from the stack into r8
ldr r8, [sp]
// Load the SVC returned values into the appropriate registers
// A SVC call can return up to 4 values - we do not need to store back r4-r7.
stm r8, {r0-r3}
mov r0, r8
// Restore the registers r4-r8
pop {r1, r4-r8}
bx lr
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