| /* SPDX-License-Identifier: GPL-2.0-only */ | |
| /* | |
| * arch/arm/lib/call_with_stack.S | |
| * | |
| * Copyright (C) 2011 ARM Ltd. | |
| * Written by Will Deacon <will.deacon@arm.com> | |
| */ | |
| #include <linux/linkage.h> | |
| #include <asm/assembler.h> | |
| /* | |
| * void call_with_stack(void (*fn)(void *), void *arg, void *sp) | |
| * | |
| * Change the stack to that pointed at by sp, then invoke fn(arg) with | |
| * the new stack. | |
| */ | |
| ENTRY(call_with_stack) | |
| str sp, [r2, #-4]! | |
| str lr, [r2, #-4]! | |
| mov sp, r2 | |
| mov r2, r0 | |
| mov r0, r1 | |
| badr lr, 1f | |
| ret r2 | |
| 1: ldr lr, [sp] | |
| ldr sp, [sp, #4] | |
| ret lr | |
| ENDPROC(call_with_stack) |