link.h

glibc 库, 不仅可以学习使用库函数,还可以学习函数的具体实现,是提高功力的好资料

/* Copyright (C) 2005 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef	_LINK_H
# error "Never include <bits/link.h> directly; use <link.h> instead."
#endif


/* Registers for entry into PLT on SH.  */
typedef struct La_sh_regs
{
  uint32_t lr_r2;
  uint32_t lr_r3;
  uint32_t lr_r4;
  uint32_t lr_r5;
  uint32_t lr_r6;
  uint32_t lr_r7;
  uint32_t lr_fpscr;
  float lr_fr4;
  float lr_fr5;
  float lr_fr6;
  float lr_fr7;
  float lr_fr8;
  float lr_fr9;
  float lr_fr10;
  float lr_fr11;
} La_sh_regs;

/* Return values for calls from PLT on SH.  */
typedef struct La_sh_retval
{
  uint32_t lrv_r0;
  uint32_t lrv_r1;
  float lrv_fr0;
  float lrv_fr1;
} La_sh_retval;


__BEGIN_DECLS

extern Elf32_Addr la_sh_gnu_pltenter (Elf32_Sym *__sym, unsigned int __ndx,
				      uintptr_t *__refcook,
				      uintptr_t *__defcook,
				      La_sh_regs *__regs,
				      unsigned int *__flags,
				      const char *__symname,
				      long int *__framesizep);
extern unsigned int la_sh_gnu_pltexit (Elf32_Sym *__sym, unsigned int __ndx,
				       uintptr_t *__refcook,
				       uintptr_t *__defcook,
				       const La_sh_regs *__inregs,
				       La_sh_retval *__outregs,
				       const char *symname);

__END_DECLS