| Jorge Ramirez-Ortiz | 5ff5eee | 2018-09-23 09:41:10 +0200 | [diff] [blame] | 1 | /* |
| Toshiyuki Ogasahara | b67a8ca | 2019-03-22 16:14:00 +0900 | [diff] [blame] | 2 | * Copyright (c) 2015-2019, Renesas Electronics Corporation. All rights reserved. |
| Jorge Ramirez-Ortiz | 5ff5eee | 2018-09-23 09:41:10 +0200 | [diff] [blame] | 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <arch.h> |
| 8 | #include <asm_macros.S> |
| Jorge Ramirez-Ortiz | 5ff5eee | 2018-09-23 09:41:10 +0200 | [diff] [blame] | 9 | |
| 10 | .global rcar_pwrc_switch_stack |
| Jorge Ramirez-Ortiz | 5ff5eee | 2018-09-23 09:41:10 +0200 | [diff] [blame] | 11 | |
| 12 | /* |
| 13 | * x0 : jump address, |
| 14 | * x1 : stack address, |
| 15 | * x2 : arg, |
| 16 | * x3 : stack address (temporary) |
| 17 | */ |
| 18 | func rcar_pwrc_switch_stack |
| 19 | |
| 20 | /* lr to stack */ |
| 21 | stp x29, x30, [sp,#-16] |
| 22 | |
| 23 | /* change stack pointer */ |
| 24 | mov x3, sp |
| 25 | mov sp, x1 |
| 26 | |
| 27 | /* save stack pointer */ |
| 28 | sub sp, sp, #16 |
| 29 | stp x0, x3, [sp] |
| 30 | |
| 31 | /* data synchronization barrier */ |
| 32 | dsb sy |
| 33 | |
| 34 | /* jump to code */ |
| 35 | mov x1, x0 |
| 36 | mov x0, x2 |
| 37 | blr x1 |
| 38 | |
| 39 | /* load stack pointer */ |
| 40 | ldp x0, x2, [sp,#0] |
| 41 | |
| 42 | /* change stack pointer */ |
| 43 | mov sp, x2 |
| 44 | |
| 45 | /* return */ |
| 46 | ldp x29, x30, [sp,#-16] |
| 47 | ret |
| 48 | endfunc rcar_pwrc_switch_stack |