diff options
Diffstat (limited to 'sysdeps/x86/nptl/pt-longjmp.c')
| -rw-r--r-- | sysdeps/x86/nptl/pt-longjmp.c | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/sysdeps/x86/nptl/pt-longjmp.c b/sysdeps/x86/nptl/pt-longjmp.c deleted file mode 100644 index 77b32667ee..0000000000 --- a/sysdeps/x86/nptl/pt-longjmp.c +++ /dev/null @@ -1,71 +0,0 @@ -/* ABI compatibility for 'longjmp' and 'siglongjmp' symbols in libpthread ABI. - X86 version. - Copyright (C) 1918-2021 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 - <https://www.gnu.org/licenses/>. */ - -#include <pthreadP.h> -#include <jmp_buf-ssp.h> - -#ifdef __x86_64__ -# define SHADOW_STACK_POINTER_SIZE 8 -#else -# define SHADOW_STACK_POINTER_SIZE 4 -#endif - -/* Assert that the priv field in struct pthread_unwind_buf has space - to store shadow stack pointer. */ -_Static_assert ((offsetof (struct pthread_unwind_buf, priv) - <= SHADOW_STACK_POINTER_OFFSET) - && ((offsetof (struct pthread_unwind_buf, priv) - + sizeof (((struct pthread_unwind_buf *) 0)->priv)) - >= (SHADOW_STACK_POINTER_OFFSET - + SHADOW_STACK_POINTER_SIZE)), - "Shadow stack pointer is not within private storage " - "of pthread_unwind_buf."); - -#include <shlib-compat.h> - -/* libpthread once had its own longjmp (and siglongjmp alias), though there - was no apparent reason for it. There is no use in having a separate - symbol in libpthread, but the historical ABI requires it. For static - linking, there is no need to provide anything here--the libc version - will be linked in. For shared library ABI compatibility, there must be - longjmp and siglongjmp symbols in libpthread.so. - - With an IFUNC resolver, it would be possible to avoid the indirection, - but the IFUNC resolver might run before the __libc_longjmp symbol has - been relocated, in which case the IFUNC resolver would not be able to - provide the correct address. */ - -#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22) - -static void __attribute__ ((noreturn, used)) -longjmp_compat (jmp_buf env, int val) -{ - /* NB: We call __libc_siglongjmp, instead of __libc_longjmp, since - __libc_longjmp is a private interface for cancellation which - doesn't restore shadow stack register. */ - __libc_siglongjmp (env, val); -} - -strong_alias (longjmp_compat, longjmp_alias) -compat_symbol (libpthread, longjmp_alias, longjmp, GLIBC_2_0); - -strong_alias (longjmp_alias, siglongjmp_alias) -compat_symbol (libpthread, siglongjmp_alias, siglongjmp, GLIBC_2_0); - -#endif |