1*4882a593Smuzhiyun/* SPDX-License-Identifier: GPL-2.0-only */ 2*4882a593Smuzhiyun/* 3*4882a593Smuzhiyun * arch/arm/lib/call_with_stack.S 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (C) 2011 ARM Ltd. 6*4882a593Smuzhiyun * Written by Will Deacon <will.deacon@arm.com> 7*4882a593Smuzhiyun */ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun#include <linux/linkage.h> 10*4882a593Smuzhiyun#include <asm/assembler.h> 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun/* 13*4882a593Smuzhiyun * void call_with_stack(void (*fn)(void *), void *arg, void *sp) 14*4882a593Smuzhiyun * 15*4882a593Smuzhiyun * Change the stack to that pointed at by sp, then invoke fn(arg) with 16*4882a593Smuzhiyun * the new stack. 17*4882a593Smuzhiyun */ 18*4882a593SmuzhiyunENTRY(call_with_stack) 19*4882a593Smuzhiyun str sp, [r2, #-4]! 20*4882a593Smuzhiyun str lr, [r2, #-4]! 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun mov sp, r2 23*4882a593Smuzhiyun mov r2, r0 24*4882a593Smuzhiyun mov r0, r1 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun badr lr, 1f 27*4882a593Smuzhiyun ret r2 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun1: ldr lr, [sp] 30*4882a593Smuzhiyun ldr sp, [sp, #4] 31*4882a593Smuzhiyun ret lr 32*4882a593SmuzhiyunENDPROC(call_with_stack) 33