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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __ASM_ARM_COMMON_H
#define __ASM_ARM_COMMON_H
#include <linux/compiler.h>
static inline unsigned long get_pc(void)
{
unsigned long pc;
#ifdef CONFIG_CPU_32
__asm__ __volatile__(
"mov %0, pc\n"
: "=r" (pc)
:
: "memory");
#else
__asm__ __volatile__(
"adr %0, .\n"
: "=r" (pc)
:
: "memory");
#endif
return pc;
}
static inline unsigned long get_lr(void)
{
unsigned long lr;
__asm__ __volatile__(
"mov %0, lr\n"
: "=r" (lr)
:
: "memory");
return lr;
}
static inline unsigned long get_sp(void)
{
unsigned long sp;
__asm__ __volatile__(
"mov %0, sp\n"
: "=r" (sp)
:
: "memory");
return sp;
}
extern void __compiletime_error(
"arm_setup_stack() called outside of naked function. On ARM64, "
"stack should be setup in non-inline assembly before branching to C entry point."
) __unsafe_setup_stack(void);
/*
* Sets up new stack growing down from top within a naked C function.
* The first stack word will be top - sizeof(word).
*
* Avoid interleaving with C code as much as possible and jump
* ASAP to a noinline function.
*/
static inline void arm_setup_stack(unsigned long top)
{
if (IS_ENABLED(CONFIG_CPU_64))
__unsafe_setup_stack();
__asm__ __volatile__("mov sp, %0"
:
: "r"(top));
}
#endif /* __ASM_ARM_COMMON_H */
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