diff options
Diffstat (limited to 'REORG.TODO/sysdeps/generic/dl-osinfo.h')
-rw-r--r-- | REORG.TODO/sysdeps/generic/dl-osinfo.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/generic/dl-osinfo.h b/REORG.TODO/sysdeps/generic/dl-osinfo.h new file mode 100644 index 0000000000..cdee4124d4 --- /dev/null +++ b/REORG.TODO/sysdeps/generic/dl-osinfo.h @@ -0,0 +1,59 @@ +/* Operating system specific code for generic dynamic loader functions. + Copyright (C) 2009-2017 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/>. */ + +#include <endian.h> +#include <stdint.h> + +static inline uintptr_t __attribute__ ((always_inline)) +_dl_setup_stack_chk_guard (void *dl_random) +{ + union + { + uintptr_t num; + unsigned char bytes[sizeof (uintptr_t)]; + } ret = { 0 }; + + if (dl_random == NULL) + { + ret.bytes[sizeof (ret) - 1] = 255; + ret.bytes[sizeof (ret) - 2] = '\n'; + } + else + { + memcpy (ret.bytes, dl_random, sizeof (ret)); +#if BYTE_ORDER == LITTLE_ENDIAN + ret.num &= ~(uintptr_t) 0xff; +#elif BYTE_ORDER == BIG_ENDIAN + ret.num &= ~((uintptr_t) 0xff << (8 * (sizeof (ret) - 1))); +#else +# error "BYTE_ORDER unknown" +#endif + } + return ret.num; +} + +static inline uintptr_t __attribute__ ((always_inline)) +_dl_setup_pointer_guard (void *dl_random, uintptr_t stack_chk_guard) +{ + uintptr_t ret; + if (dl_random == NULL) + ret = stack_chk_guard; + else + memcpy (&ret, (char *) dl_random + sizeof (ret), sizeof (ret)); + return ret; +} |