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 .arch_extension virt 18 19 GCC_ASM_EXPORT(ArmCallHvc) 20 21 ASM_PFX(ArmCallHvc): 22 push {r4-r8} 23 // r0 will be popped just after the HVC call 24 push {r0} 25 26 // Load the HVC arguments values into the appropriate registers 27 ldr r7, [r0, #28] 28 ldr r6, [r0, #24] 29 ldr r5, [r0, #20] 30 ldr r4, [r0, #16] 31 ldr r3, [r0, #12] 32 ldr r2, [r0, #8] 33 ldr r1, [r0, #4] 34 ldr r0, [r0, #0] 35 36 hvc #0 37 38 // Pop the ARM_HVC_ARGS structure address from the stack into r8 39 pop {r8} 40 41 // Load the HVC returned values into the appropriate registers 42 // A HVC call can return up to 4 values - we do not need to store back r4-r7. 43 str r3, [r8, #12] 44 str r2, [r8, #8] 45 str r1, [r8, #4] 46 str r0, [r8, #0] 47 48 mov r0, r8 49 50 // Restore the registers r4-r8 51 pop {r4-r8} 52 53 bx lr 54
