/* 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>#include <asm/unwind.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. * * The sequence below follows the APCS frame convention for frame pointer * unwinding, and implements the unwinder annotations needed by the EABI * unwinder. */ ENTRY(call_with_stack)#if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC)	mov	ip, sp	push	{fp, ip, lr, pc}	sub	fp, ip, #4#elseUNWIND( .fnstart		)UNWIND( .save	{fpreg, lr}	)	push	{fpreg, lr}UNWIND( .setfp	fpreg, sp	)	mov	fpreg, sp#endif	mov	sp, r2	mov	r2, r0	mov	r0, r1 	bl_r	r2 #if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC)	ldmdb	fp, {fp, sp, pc}#else	mov	sp, fpreg	pop	{fpreg, pc}UNWIND( .fnend			)#endif	.globl call_with_stack_endcall_with_stack_end:ENDPROC(call_with_stack)