arch/um/os-Linux/user_syms.c

Source file repositories/reference/linux-study-clean/arch/um/os-Linux/user_syms.c

File Facts

System
Linux kernel
Corpus path
arch/um/os-Linux/user_syms.c
Extension
.c
Size
1088 bytes
Lines
38
Domain
Architecture Layer
Bucket
arch/um
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration 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

// SPDX-License-Identifier: GPL-2.0
#define __NO_FORTIFY
#include <linux/types.h>
#include <linux/module.h>

/*
 * This file exports some critical string functions and compiler
 * built-in functions (where calls are emitted by the compiler
 * itself that we cannot avoid even in kernel code) to modules.
 *
 * "_user.c" code that previously used exports here such as hostfs
 * really should be considered part of the 'hypervisor' and define
 * its own API boundary like hostfs does now; don't add exports to
 * this file for such cases.
 */

/* If it's not defined, the export is included in lib/string.c.*/
#ifdef __HAVE_ARCH_STRSTR
#undef strstr
EXPORT_SYMBOL(strstr);
#endif

#ifndef __x86_64__
#undef memcpy
extern void *memcpy(void *, const void *, size_t);
EXPORT_SYMBOL(memcpy);
extern void *memmove(void *, const void *, size_t);
EXPORT_SYMBOL(memmove);
#undef memset
extern void *memset(void *, int, size_t);
EXPORT_SYMBOL(memset);
#endif

#ifdef _FORTIFY_SOURCE
extern int __sprintf_chk(char *str, int flag, size_t len, const char *format);
EXPORT_SYMBOL(__sprintf_chk);
#endif

Annotation

Implementation Notes