// | |
// Copyright (c) 2012-2014, ARM Limited. All rights reserved. | |
// Copyright (c) 2014, Linaro Limited. All rights reserved. | |
// | |
// This program and the accompanying materials | |
// are licensed and made available under the terms and conditions of the BSD License | |
// which accompanies this distribution. The full text of the license may be found at | |
// http://opensource.org/licenses/bsd-license.php | |
// | |
// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
// | |
// | |
.text | |
.align 3 | |
.arch_extension virt | |
GCC_ASM_EXPORT(ArmCallHvc) | |
ASM_PFX(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 |