/* Initialization code run first thing by the ELF startup code.  For i386/Hurd.   Copyright (C) 1995,96,97,98,99,2000,01,02,03,04,05	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.  */#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"		/* XXX */#include "../locale/localeinfo.h"#include <ldsodefs.h>#include <fpu_control.h>extern void __mach_init (void);extern void __init_misc (int, char **, char **);#ifdef USE_NONOPTION_FLAGSextern void __getopt_clean_environment (char **);#endif#ifndef SHAREDextern void _dl_non_dynamic_init (void) internal_function;#endifextern void __libc_global_ctors (void);unsigned int __hurd_threadvar_max;unsigned long int __hurd_threadvar_stack_offset;unsigned long int __hurd_threadvar_stack_mask;#ifndef SHAREDint __libc_enable_secure;#endifint __libc_multiple_libcs attribute_hidden = 1;extern int __libc_argc attribute_hidden;extern char **__libc_argv attribute_hidden;extern char **_dl_argv;extern void *(*_cthread_init_routine) (void) __attribute__ ((weak));void (*_cthread_exit_routine) (int status) __attribute__ ((__noreturn__));/* Things that want to be run before _hurd_init or much anything else.   Importantly, these are called before anything tries to use malloc.  */DEFINE_HOOK (_hurd_preinit_hook, (void));/* We call this once the Hurd magic is all set up and we are ready to be a   Posixoid program.  This does the same things the generic version does.  */static voidposixland_init (int argc, char **argv, char **envp){  __libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;  /* Make sure we don't initialize twice.  */  if (!__libc_multiple_libcs)    {      /* Set the FPU control word to the proper default value.  */      __setfpucw (__fpu_control);    }  /* Save the command-line arguments.  */  __libc_argc = argc;  __libc_argv = argv;  __environ = envp;#ifndef SHARED  _dl_non_dynamic_init ();#endif  __init_misc (argc, argv, envp);#ifdef USE_NONOPTION_FLAGS  /* This is a hack to make the special getopt in GNU libc working.  */  __getopt_clean_environment (envp);#endif#ifdef SHARED  __libc_global_ctors ();#endif}static voidinit1 (int argc, char *arg0, ...){  char **argv = &arg0;  char **envp = &argv[argc + 1];  struct hurd_startup_data *d;#ifndef SHARED  extern ElfW(Phdr) *_dl_phdr;  extern size_t _dl_phnum;#endif  while (*envp)    ++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.  */  if ((void *) d == argv[0])    {#ifndef SHARED      /* We may need to see our own phdrs, e.g. for TLS setup.         Try the usual kludge to find the headers without help from	 the exec server.  */      extern const void _start;      const ElfW(Ehdr) *const ehdr = &_start;      _dl_phdr = (ElfW(Phdr) *) ((const void *) ehdr + ehdr->e_phoff);      _dl_phnum = ehdr->e_phnum;      assert (ehdr->e_phentsize == sizeof (ElfW(Phdr)));#endif      return;    }#ifndef SHARED  __libc_enable_secure = d->flags & EXEC_SECURE;  _dl_phdr = (ElfW(Phdr) *) d->phdr;  _dl_phnum = d->phdrsz / sizeof (ElfW(Phdr));  assert (d->phdrsz % sizeof (ElfW(Phdr)) == 0);#endif  _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 (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);}static inline voidinit (int *data){  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);  threadvars[_HURD_THREADVAR_LOCALE] = (unsigned long int) &_nl_global_locale;  __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)    ++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 && _cthread_init_routine)    {      /* Initialize cthreads, which will allocate us a new stack to run on.  */      int *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 *) (newsp + 1);#endif      /* Set up the Hurd startup data block immediately following	 the argument and environment pointers on the new stack.  */      od = ((void *) 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);      else	/* Copy the Hurd startup data block to the new stack.  */	*od = *d;      /* Push the user code address on the top of the new stack.  It will	 be the return address for `init1'; we will jump there with NEWSP	 as the stack pointer.  */      *--newsp = data[-1];      ((void **) data)[-1] = switch_stacks;      /* Force NEWSP into %ecx and &init1 into %eax, which are not restored	 by function return.  */      asm volatile ("# a %0 c %1" : : "a" (newsp), "c" (&init1));    }  else    {      /* 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;      int usercode;      void call_init1 (void);      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;      /* The argument data is just above the stack frame we will unwind by	 returning.  Mutate our own return address to run the code below.  */      usercode = data[-1];      data[-1] = (int) &call_init1;      /* Force USERCODE into %eax and &init1 into %ecx, which are not	 restored by function return.  */      asm volatile ("# a %0 c %1" : : "a" (usercode), "c" (&init1));    }}/* These bits of inline assembler used to be located inside `init'.   However they were optimized away by gcc 2.95.  *//* The return address of `init' above, was redirected to here, so at   this point our stack is unwound and callers' registers restored.   Only %ecx and %eax are call-clobbered and thus still have the   values we set just above.  Fetch from there the new stack pointer   we will run on, and jmp to the run-time address of `init1'; when it   returns, it will run the user code with the argument data at the   top of the stack.  */asm ("switch_stacks:\n"     "	movl %eax, %esp\n"     "	jmp *%ecx");/* As in the stack-switching case, at this point our stack is unwound   and callers' registers restored, and only %ecx and %eax communicate   values from the lines above.  In this case we have stashed in %eax   the user code return address.  Push it on the top of the stack so   it acts as init1's return address, and then jump there.  */asm ("call_init1:\n"     "	push %eax\n"     "	jmp *%ecx\n");/* Do the first essential initializations that must precede all else.  */static inline voidfirst_init (void){  /* Initialize data structures so we can do RPCs.  */  __mach_init ();  RUN_HOOK (_hurd_preinit_hook, ());}#ifdef SHARED/* This function is called specially by the dynamic linker to do early   initialization of the shared C library before normal initializers   expecting a Posixoid environment can run.  It gets called with the   stack set up just as the user will see it, so it can switch stacks.  */void_dl_init_first (void){  first_init ();  init ((int *) __builtin_frame_address (0) + 2);}#endif#ifdef SHARED/* The regular posixland initialization is what goes into libc's   normal initializer.  *//* NOTE!  The linker notices the magical name `_init' and sets the DT_INIT   pointer in the dynamic section based solely on that.  It is convention   for this function to be in the `.init' section, but the symbol name is   the only thing that really matters!!  */strong_alias (posixland_init, _init);void__libc_init_first (int argc, char **argv, char **envp){  /* Everything was done in the shared library initializer, _init.  */}#elsestrong_alias (posixland_init, __libc_init_first);/* XXX This is all a crock and I am not happy with it.   This poorly-named function is called by static-start.S,   which should not exist at all.  */void_hurd_stack_setup (void){  intptr_t caller = (intptr_t) __builtin_return_address (0);  void doinit (intptr_t *data)    {      /* This function gets called with the argument data at TOS.  */      void doinit1 (void)	{	  init ((int *) __builtin_frame_address (0) + 2);	}      /* Push the user return address after the argument data, and then         jump to `doinit1' (above), so it is as if __libc_init_first's         caller had called `doinit1' with the argument data already on the         stack.  */      *--data = caller;      asm volatile ("movl %0, %%esp\n" /* Switch to new outermost stack.  */		    "movl $0, %%ebp\n" /* Clear outermost frame pointer.  */		    "jmp *%1" : : "r" (data), "r" (&doinit1) : "sp");      /* NOTREACHED */    }  first_init ();  _hurd_startup ((void **) __builtin_frame_address (0) + 2, &doinit);}#endif/* This function is defined here so that if this file ever gets into   ld.so we will get a link error.  Having this file silently included   in ld.so causes disaster, because the _init definition above will   cause ld.so to gain an init function, which is not a cool thing. */void_dl_start (void){  abort ();}