1 /* Parse the Linux auxiliary vector. 2 Copyright (C) 1995-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #include <elf.h> 20 #include <entry.h> 21 #include <fpu_control.h> 22 #include <ldsodefs.h> 23 #include <link.h> 24 25 typedef ElfW(Addr) dl_parse_auxv_t[AT_MINSIGSTKSZ + 1]; 26 27 /* Copy the auxiliary vector into AUXV_VALUES and set up GLRO 28 variables. */ 29 static inline _dl_parse_auxv(ElfW (auxv_t)* av,dl_parse_auxv_t auxv_values)30void _dl_parse_auxv (ElfW(auxv_t) *av, dl_parse_auxv_t auxv_values) 31 { 32 auxv_values[AT_ENTRY] = (ElfW(Addr)) ENTRY_POINT; 33 auxv_values[AT_PAGESZ] = EXEC_PAGESIZE; 34 auxv_values[AT_FPUCW] = _FPU_DEFAULT; 35 36 /* NB: Default to a constant CONSTANT_MINSIGSTKSZ. */ 37 _Static_assert (__builtin_constant_p (CONSTANT_MINSIGSTKSZ), 38 "CONSTANT_MINSIGSTKSZ is constant"); 39 auxv_values[AT_MINSIGSTKSZ] = CONSTANT_MINSIGSTKSZ; 40 41 for (; av->a_type != AT_NULL; av++) 42 if (av->a_type <= AT_MINSIGSTKSZ) 43 auxv_values[av->a_type] = av->a_un.a_val; 44 45 GLRO(dl_pagesize) = auxv_values[AT_PAGESZ]; 46 __libc_enable_secure = auxv_values[AT_SECURE]; 47 GLRO(dl_platform) = (void *) auxv_values[AT_PLATFORM]; 48 GLRO(dl_hwcap) = auxv_values[AT_HWCAP]; 49 GLRO(dl_hwcap2) = auxv_values[AT_HWCAP2]; 50 GLRO(dl_clktck) = auxv_values[AT_CLKTCK]; 51 GLRO(dl_fpu_control) = auxv_values[AT_FPUCW]; 52 _dl_random = (void *) auxv_values[AT_RANDOM]; 53 GLRO(dl_minsigstacksize) = auxv_values[AT_MINSIGSTKSZ]; 54 GLRO(dl_sysinfo_dso) = (void *) auxv_values[AT_SYSINFO_EHDR]; 55 #ifdef NEED_DL_SYSINFO 56 if (GLRO(dl_sysinfo_dso) != NULL) 57 GLRO(dl_sysinfo) = auxv_values[AT_SYSINFO]; 58 #endif 59 60 DL_PLATFORM_AUXV 61 } 62