1 // 2 // Copyright (c) 2012-2014, ARM Limited. All rights reserved. 3 // 4 // This program and the accompanying materials 5 // are licensed and made available under the terms and conditions of the BSD License 6 // which accompanies this distribution. The full text of the license may be found at 7 // http://opensource.org/licenses/bsd-license.php 8 // 9 // THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 // WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 // 12 // 13 14 .text 15 .align 3 16 .arch_extension sec 17 18 GCC_ASM_EXPORT(ArmCallSmc) 19 20 ASM_PFX(ArmCallSmc): 21 push {r4-r8} 22 // r0 will be popped just after the SMC call 23 push {r0} 24 25 // Load the SMC arguments values into the appropriate registers 26 ldr r7, [r0, #28] 27 ldr r6, [r0, #24] 28 ldr r5, [r0, #20] 29 ldr r4, [r0, #16] 30 ldr r3, [r0, #12] 31 ldr r2, [r0, #8] 32 ldr r1, [r0, #4] 33 ldr r0, [r0, #0] 34 35 smc #0 36 37 // Pop the ARM_SMC_ARGS structure address from the stack into r8 38 pop {r8} 39 40 // Load the SMC returned values into the appropriate registers 41 // A SMC call can return up to 4 values - we do not need to store back r4-r7. 42 str r3, [r8, #12] 43 str r2, [r8, #8] 44 str r1, [r8, #4] 45 str r0, [r8, #0] 46 47 mov r0, r8 48 49 // Restore the registers r4-r8 50 pop {r4-r8} 51 52 bx lr 53
