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Diffstat (limited to 'sysdeps/nacl/dl-sysdep.c')
| -rw-r--r-- | sysdeps/nacl/dl-sysdep.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/sysdeps/nacl/dl-sysdep.c b/sysdeps/nacl/dl-sysdep.c new file mode 100644 index 0000000000..3e902c2cae --- /dev/null +++ b/sysdeps/nacl/dl-sysdep.c @@ -0,0 +1,89 @@ +/* Operating system support for run-time dynamic linker. NaCl version. + Copyright (C) 2015 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, see + <http://www.gnu.org/licenses/>. */ + +#ifdef SHARED + +# include <assert.h> +# include <ldsodefs.h> +# include <stdint.h> +# include <nacl-interfaces.h> + +/* NaCl's elf32.h is incompatible with the real <elf.h>. */ +# define NATIVE_CLIENT_SRC_INCLUDE_ELF32_H_ +# include <native_client/src/untrusted/nacl/nacl_startup.h> + +/* The RTLD_START code sets up the pointer that gets to these + macros as COOKIE to point to two words: + [0] the argument to the entry point from the system (see nacl_startup.h) + [1] the stack base +*/ + +# define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp) \ + do { \ + uint32_t *_info = ((void **) (cookie))[0]; \ + (argc) = nacl_startup_argc (_info); \ + (argv) = nacl_startup_argv (_info); \ + (envp) = nacl_startup_envp (_info); \ + (auxp) = nacl_startup_auxv (_info); \ + } while (0) + +# define DL_STACK_END(cookie) (((void **) (cookie))[1]) + +/* This is called from the entry point (_start), defined by the RTLD_START + macro in the machine-specific dl-machine.h file. At this point, dynamic + linking has been completed and the first argument is the application's + entry point. */ +attribute_hidden internal_function __attribute__ ((noreturn)) +void +_dl_start_user (void (*user_entry) (uint32_t info[]), uint32_t info[]) +{ + if (_dl_skip_args > 0) + { + /* There are some arguments that the user program should not see. + Just slide up the INFO pointer so its NACL_STARTUP_ARGV points + to what should now be argv[0], and copy back the earlier fields. */ + assert (nacl_startup_argc (info) >= _dl_skip_args); + assert (NACL_STARTUP_ARGV == 3); + uint32_t envc = info[NACL_STARTUP_ENVC]; + uint32_t argc = info[NACL_STARTUP_ARGC]; + info += _dl_skip_args; + info[NACL_STARTUP_ENVC] = envc; + info[NACL_STARTUP_ARGC] = argc - _dl_skip_args; + } + + /* Pass our finalizer function to the user. */ + info[NACL_STARTUP_FINI] = (uintptr_t) &_dl_fini; + + /* Run initializers. */ + _dl_init (GL(dl_ns)[0]._ns_loaded, + nacl_startup_argc (info), + nacl_startup_argv (info), + nacl_startup_envp (info)); + + /* Call the user's entry point. This should never return. */ + (*user_entry) (info); + + /* Fail clearly just in case it did return. */ + __builtin_trap (); +} + +# define DL_SYSDEP_INIT __nacl_initialize_interfaces () + +#endif /* SHARED */ + +#include <elf/dl-sysdep.c> |