| // | |
| // Copyright (c) 2012-2014, ARM Limited. All rights reserved. | |
| // | |
| // SPDX-License-Identifier: BSD-2-Clause-Patent | |
| // | |
| // | |
| #include <AsmMacroIoLib.h> | |
| .arch_extension sec | |
| ASM_FUNC(ArmCallSmc) | |
| push {r4-r8} | |
| // r0 will be popped just after the SMC call | |
| push {r0} | |
| // Load the SMC 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] | |
| smc #0 | |
| // Pop the ARM_SMC_ARGS structure address from the stack into r8 | |
| pop {r8} | |
| // Load the SMC returned values into the appropriate registers | |
| // A SMC 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 |