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glibc  2.9
init-first.c File Reference
#include <assert.h>
#include <hurd.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sysdep.h>
#include <set-hooks.h>
#include "hurdstartup.h"
#include "hurdmalloc.h"

Go to the source code of this file.


void __mach_init (void)
void __init_misc (int, char **, char **)
void _dl_non_dynamic_init (void)
static void init1 (intptr_t *data)
static void init (intptr_t *data)
static void first_init (void)
 strong_alias (posixland_init, __libc_init_first)
void _hurd_stack_setup (volatile intptr_t argc,...)
void _dl_start (void)

Function Documentation

void __init_misc ( int  ,
char **  ,
char **   
void __mach_init ( void  )
void _dl_non_dynamic_init ( void  )

Definition at line 36 of file init-first.c.

  __libc_argc = argc;
  __libc_argv = argv;
  __environ = envp;

#ifndef SHARED
  _dl_non_dynamic_init ();
  __init_misc (argc, argv, envp);

  /* This is a hack to make the special getopt in GNU libc working.  */
  __getopt_clean_environment (envp);

#ifdef SHARED
  __libc_global_ctors ();
void _dl_start ( void  )

Definition at line 299 of file init-first.c.

  abort ();

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void _hurd_stack_setup ( volatile intptr_t  argc,

Definition at line 284 of file init-first.c.

  first_init ();

  _hurd_startup ((void **) &argc, &init);

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static void first_init ( void  ) [inline, static]

Definition at line 241 of file init-first.c.

  /* Initialize data structures so we can do RPCs.  */
  __mach_init ();

  RUN_HOOK (_hurd_preinit_hook, ());

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static void init ( intptr_t data) [inline, static]

Definition at line 137 of file init-first.c.

  int argc = *data;
  char **argv = (void *) (data + 1);
  char **envp = &argv[argc + 1];
  struct hurd_startup_data *d;
  unsigned long int threadvars[_HURD_THREADVAR_MAX];

  /* Provide temporary storage for thread-specific variables on the
     startup stack so the cthreads initialization code can use them
     for malloc et al, or so we can use malloc below for the real
     threadvars array.  */
  memset (threadvars, 0, sizeof threadvars);
  __hurd_threadvar_stack_offset = (unsigned long int) threadvars;

  /* Since the cthreads initialization code uses malloc, and the
     malloc initialization code needs to get at the environment, make
     sure we can find it.  We'll need to do this again later on since
     switching stacks changes the location where the environment is
     stored.  */
  __environ = envp;

  while (*envp)
  d = (void *) ++envp;

  /* The user might have defined a value for this, to get more variables.
     Otherwise it will be zero on startup.  We must make sure it is set
     properly before before cthreads initialization, so cthreads can know
     how much space to leave for thread variables.  */
  if (__hurd_threadvar_max < _HURD_THREADVAR_MAX)
    __hurd_threadvar_max = _HURD_THREADVAR_MAX;

  /* After possibly switching stacks, call `init1' (above) with the user
     code as the return address, and the argument data immediately above
     that on the stack.  */

  if (_cthread_init_routine)
      /* Initialize cthreads, which will allocate us a new stack to run on.  */
      void *newsp = (*_cthread_init_routine) ();
      struct hurd_startup_data *od;

      void switch_stacks (void);

      /* Copy per-thread variables from that temporary
        area onto the new cthread stack.  */
      memcpy (__hurd_threadvar_location_from_sp (0, newsp),
             threadvars, sizeof threadvars);

      /* Copy the argdata from the old stack to the new one.  */
      newsp = memcpy (newsp - ((char *) &d[1] - (char *) data), data,
                    (char *) d - (char *) data);

#ifdef SHARED
      /* And readjust the dynamic linker's idea of where the argument
         vector lives.  */
      assert (_dl_argv == argv);
      _dl_argv = (void *) ((int *) newsp + 1);

      /* Set up the Hurd startup data block immediately following
        the argument and environment pointers on the new stack.  */
      od = (newsp + ((char *) d - (char *) data));
      if ((void *) argv[0] == d)
       /* We were started up by the kernel with arguments on the stack.
          There is no Hurd startup data, so zero the block.  */
       memset (od, 0, sizeof *od);
       /* Copy the Hurd startup data block to the new stack.  */
       *od = *d;

         Force NEWSP into sp and &init1 into pv, then branch to pv (call init1).
      asm volatile ("lda $30,0(%0); lda $27,0(%1); jsr $26,($27)"
                  : : "r" (newsp), "r" (&init1));
      /* We are not using cthreads, so we will have just a single allocated
        area for the per-thread variables of the main user thread.  */
      unsigned long int *array;
      unsigned int i;

      array = malloc (__hurd_threadvar_max * sizeof (unsigned long int));
      if (array == NULL)
       __libc_fatal ("Can't allocate single-threaded thread variables.");

      /* Copy per-thread variables from the temporary array into the
        newly malloc'd space.  */
      memcpy (array, threadvars, sizeof threadvars);
      __hurd_threadvar_stack_offset = (unsigned long int) array;
      for (i = _HURD_THREADVAR_MAX; i < __hurd_threadvar_max; ++i)
       array[i] = 0;

      init1 (data);

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static void init1 ( intptr_t data) [static]

Definition at line 87 of file init-first.c.

  int argc = (intptr_t) *data;
  char **argv = (char **) &data[1];
  char **envp = &argv[argc + 1];
  struct hurd_startup_data *d;

  while (*envp)
  d = (void *) ++envp;

  /* If we are the bootstrap task started by the kernel,
     then after the environment pointers there is no Hurd
     data block; the argument strings start there.  */
  /* OSF Mach starts the bootstrap task with argc == 0.
     XXX This fails if a non-bootstrap task gets started
     with argc == 0.  */
  if (argc && (void *) d != argv[0])
      _hurd_init_dtable = d->dtable;
      _hurd_init_dtablesize = d->dtablesize;

       /* Check if the stack we are now on is different from
          the one described by _hurd_stack_{base,size}.  */

       char dummy;
       const vm_address_t newsp = (vm_address_t) &dummy;

       if (d->stack_size != 0 && (newsp < d->stack_base ||
                               newsp - d->stack_base > d->stack_size))
         /* The new stack pointer does not intersect with the
            stack the exec server set up for us, so free that stack.  */
         __vm_deallocate (__mach_task_self (), d->stack_base, d->stack_size);

  if ((void *) d != argv[0] && (d->portarray || d->intarray))
    /* Initialize library data structures, start signal processing, etc.  */
    _hurd_init (d->flags, argv,
              d->portarray, d->portarraysize,
              d->intarray, d->intarraysize);

#ifndef SHARED
  __libc_enable_secure = d->flags & EXEC_SECURE;

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strong_alias ( posixland_init  ,