1 // 2 // Copyright (c) 2012-2014, ARM Limited. All rights reserved. 3 // Copyright (c) 2014-2016, 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 #include <AsmMacroIoLibV8.h> 16 17 .arch_extension virt 18 19 ASM_FUNC(ArmCallHvc) 20 push {r4-r8} 21 // r0 will be popped just after the HVC call 22 push {r0} 23 24 // Load the HVC arguments values into the appropriate registers 25 ldr r7, [r0, #28] 26 ldr r6, [r0, #24] 27 ldr r5, [r0, #20] 28 ldr r4, [r0, #16] 29 ldr r3, [r0, #12] 30 ldr r2, [r0, #8] 31 ldr r1, [r0, #4] 32 ldr r0, [r0, #0] 33 34 hvc #0 35 36 // Pop the ARM_HVC_ARGS structure address from the stack into r8 37 pop {r8} 38 39 // Load the HVC returned values into the appropriate registers 40 // A HVC call can return up to 4 values - we do not need to store back r4-r7. 41 str r3, [r8, #12] 42 str r2, [r8, #8] 43 str r1, [r8, #4] 44 str r0, [r8, #0] 45 46 mov r0, r8 47 48 // Restore the registers r4-r8 49 pop {r4-r8} 50 51 bx lr 52
