root/arch/arm/lib/call_with_stack.S

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   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)
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