| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* |
| 3 | * arch/arm/lib/call_with_stack.S |
| 4 | * |
| 5 | * Copyright (C) 2011 ARM Ltd. |
| 6 | * Written by Will Deacon <will.deacon@arm.com> |
| 7 | */ |
| 8 | |
| 9 | #include <linux/linkage.h> |
| 10 | #include <asm/assembler.h> |
| 11 | |
| 12 | /* |
| 13 | * void call_with_stack(void (*fn)(void *), void *arg, void *sp) |
| 14 | * |
| 15 | * Change the stack to that pointed at by sp, then invoke fn(arg) with |
| 16 | * the new stack. |
| 17 | */ |
| 18 | ENTRY(call_with_stack) |
| 19 | str sp, [r2, #-4]! |
| 20 | str lr, [r2, #-4]! |
| 21 | |
| 22 | mov sp, r2 |
| 23 | mov r2, r0 |
| 24 | mov r0, r1 |
| 25 | |
| 26 | badr lr, 1f |
| 27 | ret r2 |
| 28 | |
| 29 | 1: ldr lr, [sp] |
| 30 | ldr sp, [sp, #4] |
| 31 | ret lr |
| 32 | ENDPROC(call_with_stack) |