source: vendor/glibc-tests/glibc/elf/tst-auditmod1.c

#include <dlfcn.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <bits/wordsize.h>
#include <gnu/lib-names.h>


unsigned int
la_version (unsigned int v)
{
  setlinebuf (stdout);

  printf ("version: %u\n", v);

  char buf[20];
  sprintf (buf, "%u", v);

  return v;
}

void
la_activity (uintptr_t *cookie, unsigned int flag)
{
  if (flag == LA_ACT_CONSISTENT)
    printf ("activity: consistent\n");
  else if (flag == LA_ACT_ADD)
    printf ("activity: add\n");
  else if (flag == LA_ACT_DELETE)
    printf ("activity: delete\n");
  else
    printf ("activity: unknown activity %u\n", flag);
}

char *
la_objsearch (const char *name, uintptr_t *cookie, unsigned int flag)
{
  char buf[100];
  const char *flagstr;
  if (flag == LA_SER_ORIG)
    flagstr = "LA_SET_ORIG";
  else if (flag == LA_SER_LIBPATH)
    flagstr = "LA_SER_LIBPATH";
  else if (flag == LA_SER_RUNPATH)
    flagstr = "LA_SER_RUNPATH";
  else if (flag == LA_SER_CONFIG)
    flagstr = "LA_SER_CONFIG";
  else if (flag == LA_SER_DEFAULT)
    flagstr = "LA_SER_DEFAULT";
  else if (flag == LA_SER_SECURE)
    flagstr = "LA_SER_SECURE";
  else
    {
       sprintf (buf, "unknown flag %d", flag);
       flagstr = buf;
    }
  printf ("objsearch: %s, %s\n", name, flagstr);

  return (char *) name;
}

unsigned int
la_objopen (struct link_map *l, Lmid_t lmid, uintptr_t *cookie)
{
  printf ("objopen: %ld, %s\n", lmid, l->l_name);

  return 3;
}

void
la_preinit (uintptr_t *cookie)
{
  printf ("preinit\n");
}

unsigned int
la_objclose  (uintptr_t *cookie)
{
  printf ("objclose\n");
  return 0;
}

uintptr_t
la_symbind32 (Elf32_Sym *sym, unsigned int ndx, uintptr_t *refcook,
              uintptr_t *defcook, unsigned int *flags, const char *symname)
{
  printf ("symbind32: symname=%s, st_value=%#lx, ndx=%u, flags=%u\n",
          symname, (long int) sym->st_value, ndx, *flags);

  return sym->st_value;
}

uintptr_t
la_symbind64 (Elf64_Sym *sym, unsigned int ndx, uintptr_t *refcook,
              uintptr_t *defcook, unsigned int *flags, const char *symname)
{
  printf ("symbind64: symname=%s, st_value=%#lx, ndx=%u, flags=%u\n",
          symname, (long int) sym->st_value, ndx, *flags);

  return sym->st_value;
}

#ifdef __i386__
# define pltenter la_i86_gnu_pltenter
# define pltexit la_i86_gnu_pltexit
# define La_regs La_i86_regs
# define La_retval La_i86_retval
# define int_retval lrv_eax
#elif defined __x86_64__
# define pltenter la_x86_64_gnu_pltenter
# define pltexit la_x86_64_gnu_pltexit
# define La_regs La_x86_64_regs
# define La_retval La_x86_64_retval
# define int_retval lrv_rax
#elif defined __powerpc__ && __WORDSIZE == 32
# define pltenter la_ppc32_gnu_pltenter
# define pltexit la_ppc32_gnu_pltexit
# define La_regs La_ppc32_regs
# define La_retval La_ppc32_retval
# define int_retval lrv_r3
#elif defined __powerpc__ && __WORDSIZE == 64
# define pltenter la_ppc64_gnu_pltenter
# define pltexit la_ppc64_gnu_pltexit
# define La_regs La_ppc64_regs
# define La_retval La_ppc64_retval
# define int_retval lrv_r3
#elif defined __sh__
# define pltenter la_sh_gnu_pltenter
# define pltexit la_sh_gnu_pltexit
# define La_regs La_sh_regs
# define La_retval La_sh_retval
# define int_retval lrv_r0
#elif defined __mc68000__
# define pltenter la_m68k_gnu_pltenter
# define pltexit la_m68k_gnu_pltexit
# define La_regs La_m68k_regs
# define La_retval La_m68k_retval
# define int_retval lrv_d0
#elif defined __alpha__
# define pltenter la_alpha_gnu_pltenter
# define pltexit la_alpha_gnu_pltexit
# define La_regs La_alpha_regs
# define La_retval La_alpha_retval
# define int_retval lrv_r0
#elif defined __s390__ && __WORDSIZE == 32
# define pltenter la_s390_32_gnu_pltenter
# define pltexit la_s390_32_gnu_pltexit
# define La_regs La_s390_32_regs
# define La_retval La_s390_32_retval
# define int_retval lrv_r2
#elif defined __s390__ && __WORDSIZE == 64
# define pltenter la_s390_64_gnu_pltenter
# define pltexit la_s390_64_gnu_pltexit
# define La_regs La_s390_64_regs
# define La_retval La_s390_64_retval
# define int_retval lrv_r2
#elif defined __ia64__
# define pltenter la_ia64_gnu_pltenter
# define pltexit la_ia64_gnu_pltexit
# define La_regs La_ia64_regs
# define La_retval La_ia64_retval
# define int_retval lrv_r8
#elif defined __mips__ && _MIPS_SIM == _ABIO32
# define pltenter la_mips_o32_gnu_pltenter
# define pltexit la_mips_o32_gnu_pltexit
# define La_regs La_mips_32_regs
# define La_retval La_mips_32_retval
# define int_retval lrv_v0
#elif defined __mips__ && _MIPS_SIM == _ABIN32
# define pltenter la_mips_n32_gnu_pltenter
# define pltexit la_mips_n32_gnu_pltexit
# define La_regs La_mips_64_regs
# define La_retval La_mips_64_retval
# define int_retval lrv_v0
#elif defined __mips__ && _MIPS_SIM == _ABI64
# define pltenter la_mips_n64_gnu_pltenter
# define pltexit la_mips_n64_gnu_pltexit
# define La_regs La_mips_64_regs
# define La_retval La_mips_64_retval
# define int_retval lrv_v0
#elif defined __sparc__ && __WORDSIZE == 32
# define pltenter la_sparc32_gnu_pltenter
# define pltexit la_sparc32_gnu_pltexit
# define La_regs La_sparc32_regs
# define La_retval La_sparc32_retval
# define int_retval lrv_reg[0]
#elif defined __sparc__ && __WORDSIZE == 64
# define pltenter la_sparc64_gnu_pltenter
# define pltexit la_sparc64_gnu_pltexit
# define La_regs La_sparc64_regs
# define La_retval La_sparc64_retval
# define int_retval lrv_reg[0]
#else
# error "architecture specific code needed"
#endif


ElfW(Addr)
pltenter (ElfW(Sym) *sym, unsigned int ndx, uintptr_t *refcook,
          uintptr_t *defcook, La_regs *regs, unsigned int *flags,
          const char *symname, long int *framesizep)
{
  printf ("pltenter: symname=%s, st_value=%#lx, ndx=%u, flags=%u\n",
          symname, (long int) sym->st_value, ndx, *flags);

  return sym->st_value;
}

unsigned int
pltexit (ElfW(Sym) *sym, unsigned int ndx, uintptr_t *refcook,
         uintptr_t *defcook, const La_regs *inregs, La_retval *outregs,
         const char *symname)
{
  printf ("pltexit: symname=%s, st_value=%#lx, ndx=%u, retval=%tu\n",
          symname, (long int) sym->st_value, ndx, outregs->int_retval);

  return 0;
}