arch/x86/include/asm/unwind_user.h

Source file repositories/reference/linux-study-clean/arch/x86/include/asm/unwind_user.h

File Facts

System
Linux kernel
Corpus path
arch/x86/include/asm/unwind_user.h
Extension
.h
Size
961 bytes
Lines
43
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_X86_UNWIND_USER_H
#define _ASM_X86_UNWIND_USER_H

#ifdef CONFIG_UNWIND_USER

#include <asm/ptrace.h>
#include <asm/uprobes.h>

static inline int unwind_user_word_size(struct pt_regs *regs)
{
	/* We can't unwind VM86 stacks */
	if (regs->flags & X86_VM_MASK)
		return 0;
	return user_64bit_mode(regs) ? 8 : 4;
}

#endif /* CONFIG_UNWIND_USER */

#ifdef CONFIG_HAVE_UNWIND_USER_FP

#define ARCH_INIT_USER_FP_FRAME(ws)			\
	.cfa_off	=  2*(ws),			\
	.ra_off		= -1*(ws),			\
	.fp_off		= -2*(ws),			\
	.use_fp		= true,

#define ARCH_INIT_USER_FP_ENTRY_FRAME(ws)		\
	.cfa_off	=  1*(ws),			\
	.ra_off		= -1*(ws),			\
	.fp_off		= 0,				\
	.use_fp		= false,

static inline bool unwind_user_at_function_start(struct pt_regs *regs)
{
	return is_uprobe_at_func_entry(regs);
}
#define unwind_user_at_function_start unwind_user_at_function_start

#endif /* CONFIG_HAVE_UNWIND_USER_FP */

#endif /* _ASM_X86_UNWIND_USER_H */

Annotation

Implementation Notes