108 lines
3.4 KiB
C
108 lines
3.4 KiB
C
/* Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stdlib.h>
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#include <unistd.h>
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#include <elf/ldsodefs.h>
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extern void __libc_init_first (int argc, char **argv, char **envp);
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extern int _dl_starting_up;
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weak_extern (_dl_starting_up)
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extern int __libc_multiple_libcs;
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extern void *__libc_stack_end;
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struct startup_info
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{
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void *sda_base;
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int (*main) (int, char **, char **, void *);
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int (*init) (int, char **, char **, void *);
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void (*fini) (void);
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};
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int
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__libc_start_main (int argc, char **argv, char **envp,
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void *auxvec, void (*rtld_fini) (void),
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struct startup_info *stinfo,
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char **stack_on_entry)
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{
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#ifndef PIC
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/* The next variable is only here to work around a bug in gcc <= 2.7.2.2.
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If the address would be taken inside the expression the optimizer
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would try to be too smart and throws it away. Grrr. */
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int *dummy_addr = &_dl_starting_up;
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__libc_multiple_libcs = dummy_addr && !_dl_starting_up;
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#endif
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/* the PPC SVR4 ABI says that the top thing on the stack will
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be a NULL pointer, so if not we assume that we're being called
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as a statically-linked program by Linux... */
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if (*stack_on_entry != NULL)
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{
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/* ...in which case, we have argc as the top thing on the
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stack, followed by argv (NULL-terminated), envp (likewise),
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and the auxilary vector. */
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argc = *(int *) stack_on_entry;
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argv = stack_on_entry + 1;
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envp = argv + argc + 1;
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auxvec = envp;
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while (*(char **) auxvec != NULL)
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++auxvec;
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++auxvec;
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rtld_fini = NULL;
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}
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/* Store something that has some relationship to the end of the
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stack, for backtraces. This variable should be thread-specific. */
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__libc_stack_end = stack_on_entry + 4;
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/* Set the global _environ variable correctly. */
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__environ = envp;
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/* Register the destructor of the dynamic linker if there is any. */
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if (rtld_fini != NULL)
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atexit (rtld_fini);
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/* Call the initializer of the libc. */
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#ifdef PIC
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if (_dl_debug_impcalls)
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_dl_debug_message (1, "\ninitialize libc\n\n", NULL);
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#endif
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__libc_init_first (argc, argv, envp);
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/* Register the destructor of the program, if any. */
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if (stinfo->fini)
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atexit (stinfo->fini);
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/* Call the initializer of the program, if any. */
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#ifdef PIC
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if (_dl_debug_impcalls)
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_dl_debug_message (1, "\ninitialize program: ", argv[0], "\n\n", NULL);
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#endif
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if (stinfo->init)
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stinfo->init (argc, argv, __environ, auxvec);
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#ifdef PIC
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if (_dl_debug_impcalls)
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_dl_debug_message (1, "\ntransferring control: ", argv[0], "\n\n", NULL);
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#endif
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exit (stinfo->main (argc, argv, __environ, auxvec));
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}
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