1 // 2 // Copyright (c) 2012-2014, ARM Limited. All rights reserved. 3 // Copyright (c) 2014, Linaro Limited. All rights reserved. 4 // 5 // This program and the accompanying materials 6 // are licensed and made available under the terms and conditions of the BSD License 7 // which accompanies this distribution. The full text of the license may be found at 8 // http://opensource.org/licenses/bsd-license.php 9 // 10 // THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 // 13 // 14 15 .text 16 .align 3 17 18 GCC_ASM_EXPORT(ArmCallHvc) 19 20 ASM_PFX(ArmCallHvc): 21 // Push x0 on the stack - The stack must always be quad-word aligned 22 str x0, [sp, #-16]! 23 24 // Load the HVC arguments values into the appropriate registers 25 ldp x6, x7, [x0, #48] 26 ldp x4, x5, [x0, #32] 27 ldp x2, x3, [x0, #16] 28 ldp x0, x1, [x0, #0] 29 30 hvc #0 31 32 // Pop the ARM_HVC_ARGS structure address from the stack into x9 33 ldr x9, [sp], #16 34 35 // Store the HVC returned values into the ARM_HVC_ARGS structure. 36 // A HVC call can return up to 4 values 37 stp x2, x3, [x9, #16] 38 stp x0, x1, [x9, #0] 39 40 mov x0, x9 41 42 ret 43
