| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (C) 2020 Google, Inc. |
| */ |
| |
| #include <linux/linkage.h> |
| |
| .arch_extension sec |
| |
| ENTRY(trusty_smc8) |
| /* Save stack location where r3-r7 smc arguments are stored */ |
| mov r12, sp |
| |
| /* Save original r4-r7 values as caller expects these to be preserved */ |
| push {r4-r7} |
| |
| /* Save return value pointer and return address */ |
| push {r0, lr} |
| |
| /* arm abi shifts arguments when returning a struct, shift them back */ |
| mov r0, r1 |
| mov r1, r2 |
| mov r2, r3 |
| |
| /* Load stack based arguments */ |
| ldmia r12, {r3-r7} |
| |
| smc #0 |
| |
| /* Restore return address and get return value pointer */ |
| pop {r12, lr} |
| |
| /* Copy 8-register smc return value to struct smc_ret8 return value */ |
| stmia r12, {r0-r7} |
| |
| /* Restore original r4-r7 values */ |
| pop {r4-r7} |
| |
| /* Return */ |
| bx lr |
