90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
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/* Operating system support for run-time dynamic linker. NaCl version.
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Copyright (C) 2015 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifdef SHARED
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# include <assert.h>
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# include <ldsodefs.h>
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# include <stdint.h>
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# include <nacl-interfaces.h>
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/* NaCl's elf32.h is incompatible with the real <elf.h>. */
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# define NATIVE_CLIENT_SRC_INCLUDE_ELF32_H_
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# include <native_client/src/untrusted/nacl/nacl_startup.h>
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/* The RTLD_START code sets up the pointer that gets to these
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macros as COOKIE to point to two words:
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[0] the argument to the entry point from the system (see nacl_startup.h)
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[1] the stack base
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*/
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# define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp) \
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do { \
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uint32_t *_info = ((void **) (cookie))[0]; \
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(argc) = nacl_startup_argc (_info); \
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(argv) = nacl_startup_argv (_info); \
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(envp) = nacl_startup_envp (_info); \
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(auxp) = nacl_startup_auxv (_info); \
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} while (0)
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# define DL_STACK_END(cookie) (((void **) (cookie))[1])
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/* This is called from the entry point (_start), defined by the RTLD_START
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macro in the machine-specific dl-machine.h file. At this point, dynamic
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linking has been completed and the first argument is the application's
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entry point. */
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attribute_hidden internal_function __attribute__ ((noreturn))
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void
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_dl_start_user (void (*user_entry) (uint32_t info[]), uint32_t info[])
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{
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if (_dl_skip_args > 0)
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{
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/* There are some arguments that the user program should not see.
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Just slide up the INFO pointer so its NACL_STARTUP_ARGV points
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to what should now be argv[0], and copy back the earlier fields. */
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assert (nacl_startup_argc (info) >= _dl_skip_args);
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assert (NACL_STARTUP_ARGV == 3);
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uint32_t envc = info[NACL_STARTUP_ENVC];
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uint32_t argc = info[NACL_STARTUP_ARGC];
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info += _dl_skip_args;
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info[NACL_STARTUP_ENVC] = envc;
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info[NACL_STARTUP_ARGC] = argc - _dl_skip_args;
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}
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/* Pass our finalizer function to the user. */
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info[NACL_STARTUP_FINI] = (uintptr_t) &_dl_fini;
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/* Run initializers. */
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_dl_init (GL(dl_ns)[0]._ns_loaded,
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nacl_startup_argc (info),
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nacl_startup_argv (info),
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nacl_startup_envp (info));
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/* Call the user's entry point. This should never return. */
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(*user_entry) (info);
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/* Fail clearly just in case it did return. */
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__builtin_trap ();
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}
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# define DL_SYSDEP_INIT __nacl_initialize_interfaces ()
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#endif /* SHARED */
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#include <elf/dl-sysdep.c>
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