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| //
| // Copyright (c) 2012-2014, ARM Limited. All rights reserved.
| // Copyright (c) 2014-2016, Linaro Limited. All rights reserved.
| //
| // SPDX-License-Identifier: BSD-2-Clause-Patent
| //
| //
|
| #include <AsmMacroIoLib.h>
|
| .arch_extension virt
|
| ASM_FUNC(ArmCallHvc)
| push {r4-r8}
| // r0 will be popped just after the HVC call
| push {r0}
|
| // Load the HVC arguments values into the appropriate registers
| ldr r7, [r0, #28]
| ldr r6, [r0, #24]
| ldr r5, [r0, #20]
| ldr r4, [r0, #16]
| ldr r3, [r0, #12]
| ldr r2, [r0, #8]
| ldr r1, [r0, #4]
| ldr r0, [r0, #0]
|
| hvc #0
|
| // Pop the ARM_HVC_ARGS structure address from the stack into r8
| pop {r8}
|
| // Load the HVC returned values into the appropriate registers
| // A HVC call can return up to 4 values - we do not need to store back r4-r7.
| str r3, [r8, #12]
| str r2, [r8, #8]
| str r1, [r8, #4]
| str r0, [r8, #0]
|
| mov r0, r8
|
| // Restore the registers r4-r8
| pop {r4-r8}
|
| bx lr
|
|
