arch/arm/kernel/armksyms.c
/*
* linux/arch/arm/kernel/armksyms.c
*
* Copyright (C) 2000 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/cryptohash.h>
#include <linux/delay.h>
#include <linux/in6.h>
#include <linux/syscalls.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <asm/checksum.h>
#include <asm/system.h>
#include <asm/ftrace.h>
/*
* libgcc functions - functions that are used internally by the
* compiler... (prototypes are not correct though, but that
* doesn't really matter since they're not versioned).
*/
/*供gcc编译器内部使用的一些运行时函数原型声明*/
/*算术运算函数*/
extern void __ashldi3(void);//算术左移b位: int __ashlsi3 (int a, int b)
extern void __ashrdi3(void);//算术左移b位: long __ashldi3 (long a, int b)
extern void __divsi3(void);// 返回a和b的有符号除法的商: int __divsi3 (int a, int b)
extern void __lshrdi3(void);// 返回将a逻辑右移b位后的结果: long __lshrdi3 (long a, int b)
extern void __modsi3(void);// 返回a和b的有符号除法的余数: int __modsi3 (int a, int b)
extern void __muldi3(void);// 返回a和b的乘积: long __muldi3 (long a, long b)
/*该函数实现了低层次的比较，在这之上可以构建更高级别的比较运算符（像小于， *大于，或者等于）。返回值位于0到2的范围，使得高级别的比较运算符可以通过 *测试有符号比较或者无符号比较的返回值来实现。
*/
extern void __ucmpdi2(void);// 执行一个a和b的有符号比较: int __ucmpdi2 (long a, long b)
extern void __udivsi3(void);// 返回a和b的无符号除法的商: unsigned int __udivsi3 (unsigned int a, unsigned int b)
extern void __umodsi3(void);// 返回a和b的无符号除法的余数: unsigned int __umodsi3 (unsigned int a, unsigned int b)
extern void __do_div64(void);
extern void __aeabi_idiv(void); //除法
extern void __aeabi_idivmod(void);//求余
extern void __aeabi_lasr(void);//算术右移
extern void __aeabi_llsl(void);//逻辑左移
extern void __aeabi_llsr(void);//逻辑右移
extern void __aeabi_lmul(void);//乘法操作
extern void __aeabi_uidiv(void);//无符号除法
extern void __aeabi_uidivmod(void);//两无符号数求余
extern void __aeabi_ulcmp(void);//底层比较函数
extern void fpundefinstr(void);//fp未定义指令的返回地址
/* ENTRY(fp_enter)
.word fpe_not_present
.text
*/
extern void fp_enter(void);
/*
* This has a special calling convention; it doesn't
* modify any of the usual registers, except for LR.
*/
#define EXPORT_CRC_ALIAS(sym) __CRC_SYMBOL(sym, "")
#define EXPORT_SYMBOL_ALIAS(sym,orig) /
EXPORT_CRC_ALIAS(sym) /
static const struct kernel_symbol __ksymtab_##sym /
__used __attribute__((section("__ksymtab"))) = /
{ (unsigned long)&orig, #sym };
/*
* floating point math emulator support.
* These symbols will never change their calling convention...
*/
EXPORT_SYMBOL_ALIAS(kern_fp_enter,fp_enter);
EXPORT_SYMBOL_ALIAS(fp_printk,printk);
EXPORT_SYMBOL_ALIAS(fp_send_sig,send_sig);
/*导出ARM平台上的内核底层函数*/
EXPORT_SYMBOL(__backtrace);
/* platform dependent support */
EXPORT_SYMBOL(__udelay);
EXPORT_SYMBOL(__const_udelay);
/* networking */
EXPORT_SYMBOL(csum_partial);
EXPORT_SYMBOL(csum_partial_copy_from_user);
EXPORT_SYMBOL(csum_partial_copy_nocheck);
EXPORT_SYMBOL(__csum_ipv6_magic);
/* io */
#ifndef __raw_readsb
EXPORT_SYMBOL(__raw_readsb);
#endif
#ifndef __raw_readsw
EXPORT_SYMBOL(__raw_readsw);
#endif
#ifndef __raw_readsl
EXPORT_SYMBOL(__raw_readsl);
#endif
#ifndef __raw_writesb
EXPORT_SYMBOL(__raw_writesb);
#endif
#ifndef __raw_writesw
EXPORT_SYMBOL(__raw_writesw);
#endif
#ifndef __raw_writesl
EXPORT_SYMBOL(__raw_writesl);
#endif
/* string / mem functions */
EXPORT_SYMBOL(strchr);
EXPORT_SYMBOL(strrchr);
EXPORT_SYMBOL(memset);
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(memmove);
EXPORT_SYMBOL(memchr);
EXPORT_SYMBOL(__memzero);
/* user mem (segment) */
EXPORT_SYMBOL(__strnlen_user);
EXPORT_SYMBOL(__strncpy_from_user);
#ifdef CONFIG_MMU
EXPORT_SYMBOL(copy_page);
EXPORT_SYMBOL(__copy_from_user);
EXPORT_SYMBOL(__copy_to_user);
EXPORT_SYMBOL(__clear_user);
EXPORT_SYMBOL(__get_user_1);
EXPORT_SYMBOL(__get_user_2);
EXPORT_SYMBOL(__get_user_4);
EXPORT_SYMBOL(__put_user_1);
EXPORT_SYMBOL(__put_user_2);
EXPORT_SYMBOL(__put_user_4);
EXPORT_SYMBOL(__put_user_8);
#endif
/* crypto hash */
EXPORT_SYMBOL(sha_transform);
/* gcc lib functions */
EXPORT_SYMBOL(__ashldi3);
EXPORT_SYMBOL(__ashrdi3);
EXPORT_SYMBOL(__divsi3);
EXPORT_SYMBOL(__lshrdi3);
EXPORT_SYMBOL(__modsi3);
EXPORT_SYMBOL(__muldi3);
EXPORT_SYMBOL(__ucmpdi2);
EXPORT_SYMBOL(__udivsi3);
EXPORT_SYMBOL(__umodsi3);
EXPORT_SYMBOL(__do_div64);
#ifdef CONFIG_AEABI
EXPORT_SYMBOL(__aeabi_idiv);
EXPORT_SYMBOL(__aeabi_idivmod);
EXPORT_SYMBOL(__aeabi_lasr);
EXPORT_SYMBOL(__aeabi_llsl);
EXPORT_SYMBOL(__aeabi_llsr);
EXPORT_SYMBOL(__aeabi_lmul);
EXPORT_SYMBOL(__aeabi_uidiv);
EXPORT_SYMBOL(__aeabi_uidivmod);
EXPORT_SYMBOL(__aeabi_ulcmp);
#endif
/* bitops */
EXPORT_SYMBOL(_set_bit_le);
EXPORT_SYMBOL(_test_and_set_bit_le);
EXPORT_SYMBOL(_clear_bit_le);
EXPORT_SYMBOL(_test_and_clear_bit_le);
EXPORT_SYMBOL(_change_bit_le);
EXPORT_SYMBOL(_test_and_change_bit_le);
EXPORT_SYMBOL(_find_first_zero_bit_le);
EXPORT_SYMBOL(_find_next_zero_bit_le);
EXPORT_SYMBOL(_find_first_bit_le);
EXPORT_SYMBOL(_find_next_bit_le);
#ifdef __ARMEB__
EXPORT_SYMBOL(_set_bit_be);
EXPORT_SYMBOL(_test_and_set_bit_be);
EXPORT_SYMBOL(_clear_bit_be);
EXPORT_SYMBOL(_test_and_clear_bit_be);
EXPORT_SYMBOL(_change_bit_be);
EXPORT_SYMBOL(_test_and_change_bit_be);
EXPORT_SYMBOL(_find_first_zero_bit_be);
EXPORT_SYMBOL(_find_next_zero_bit_be);
EXPORT_SYMBOL(_find_first_bit_be);
EXPORT_SYMBOL(_find_next_bit_be);
#endif
#ifdef CONFIG_FUNCTION_TRACER
EXPORT_SYMBOL(mcount);
#endif