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Current File : //usr/src/linux-headers-5.4.0-1101-aws/arch/x86/include/asm/frame.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_FRAME_H
#define _ASM_X86_FRAME_H

#include <asm/asm.h>

/*
 * These are stack frame creation macros.  They should be used by every
 * callable non-leaf asm function to make kernel stack traces more reliable.
 */

#ifdef CONFIG_FRAME_POINTER

#ifdef __ASSEMBLY__

.macro FRAME_BEGIN
	push %_ASM_BP
	_ASM_MOV %_ASM_SP, %_ASM_BP
.endm

.macro FRAME_END
	pop %_ASM_BP
.endm

#ifdef CONFIG_X86_64
/*
 * This is a sneaky trick to help the unwinder find pt_regs on the stack.  The
 * frame pointer is replaced with an encoded pointer to pt_regs.  The encoding
 * is just setting the LSB, which makes it an invalid stack address and is also
 * a signal to the unwinder that it's a pt_regs pointer in disguise.
 *
 * NOTE: This macro must be used *after* PUSH_AND_CLEAR_REGS because it corrupts
 * the original rbp.
 */
.macro ENCODE_FRAME_POINTER ptregs_offset=0
	leaq 1+\ptregs_offset(%rsp), %rbp
.endm
#else /* !CONFIG_X86_64 */
/*
 * This is a sneaky trick to help the unwinder find pt_regs on the stack.  The
 * frame pointer is replaced with an encoded pointer to pt_regs.  The encoding
 * is just clearing the MSB, which makes it an invalid stack address and is also
 * a signal to the unwinder that it's a pt_regs pointer in disguise.
 *
 * NOTE: This macro must be used *after* SAVE_ALL because it corrupts the
 * original ebp.
 */
.macro ENCODE_FRAME_POINTER
	mov %esp, %ebp
	andl $0x7fffffff, %ebp
.endm
#endif /* CONFIG_X86_64 */

#else /* !__ASSEMBLY__ */

#define FRAME_BEGIN				\
	"push %" _ASM_BP "\n"			\
	_ASM_MOV "%" _ASM_SP ", %" _ASM_BP "\n"

#define FRAME_END "pop %" _ASM_BP "\n"

#ifdef CONFIG_X86_64
#define ENCODE_FRAME_POINTER			\
	"lea 1(%rsp), %rbp\n\t"
#else /* !CONFIG_X86_64 */
#define ENCODE_FRAME_POINTER			\
	"movl %esp, %ebp\n\t"			\
	"andl $0x7fffffff, %ebp\n\t"
#endif /* CONFIG_X86_64 */

#endif /* __ASSEMBLY__ */

#define FRAME_OFFSET __ASM_SEL(4, 8)

#else /* !CONFIG_FRAME_POINTER */

#ifdef __ASSEMBLY__

.macro ENCODE_FRAME_POINTER ptregs_offset=0
.endm

#else /* !__ASSEMBLY */

#define ENCODE_FRAME_POINTER

#endif

#define FRAME_BEGIN
#define FRAME_END
#define FRAME_OFFSET 0

#endif /* CONFIG_FRAME_POINTER */

#endif /* _ASM_X86_FRAME_H */

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