projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| f8f0e454 | 1 | //\r |
| 8035edbe | 2 | // Copyright (c) 2012 - 2020, ARM Limited. All rights reserved.\r |
| f8f0e454 | 3 | //\r |
| 4059386c | 4 | // SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| f8f0e454 SV |
5 | //\r |
| 6 | //\r | |
| 7 | \r | |
| 8 | .text\r | |
| 9 | .align 3\r | |
| 10 | \r | |
| 11 | GCC_ASM_EXPORT(ArmCallSvc)\r | |
| 12 | \r | |
| 13 | ASM_PFX(ArmCallSvc):\r | |
| 14 | // Push frame pointer and return address on the stack\r | |
| 15 | stp x29, x30, [sp, #-32]!\r | |
| 16 | mov x29, sp\r | |
| 17 | \r | |
| 18 | // Push x0 on the stack - The stack must always be quad-word aligned\r | |
| 19 | str x0, [sp, #16]\r | |
| 20 | \r | |
| 21 | // Load the SVC arguments values into the appropriate registers\r | |
| 22 | ldp x6, x7, [x0, #48]\r | |
| 23 | ldp x4, x5, [x0, #32]\r | |
| 24 | ldp x2, x3, [x0, #16]\r | |
| 25 | ldp x0, x1, [x0, #0]\r | |
| 26 | \r | |
| 27 | svc #0\r | |
| 8035edbe VS |
28 | // Prevent speculative execution beyond svc instruction\r |
| 29 | dsb nsh\r | |
| 30 | isb\r | |
| f8f0e454 SV |
31 | \r |
| 32 | // Pop the ARM_SVC_ARGS structure address from the stack into x9\r | |
| 33 | ldr x9, [sp, #16]\r | |
| 34 | \r | |
| 35 | // Store the SVC returned values into the ARM_SVC_ARGS structure.\r | |
| 36 | // A SVC call can return up to 4 values - we do not need to store back x4-x7.\r | |
| 37 | stp x0, x1, [x9, #0]\r | |
| 38 | stp x2, x3, [x9, #16]\r | |
| 39 | \r | |
| 40 | mov x0, x9\r | |
| 41 | \r | |
| 42 | ldp x29, x30, [sp], #32\r | |
| 43 | ret\r |