/* ABI compatibility for 'longjmp' and 'siglongjmp' symbols in libpthread ABI. Copyright (C) 2002-2015 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. 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 <setjmp.h> #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; so we define them using IFUNC to redirect to the libc function. */ #if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22) # if HAVE_IFUNC static __typeof (longjmp) * __attribute__ ((used)) longjmp_resolve (void) { return &__libc_longjmp; } # ifdef HAVE_ASM_SET_DIRECTIVE # define DEFINE_LONGJMP(name) \ asm (".set " #name ", longjmp_resolve\n" \ ".globl " #name "\n" \ ".type " #name ", %gnu_indirect_function"); # else # define DEFINE_LONGJMP(name) \ asm (#name " = longjmp_resolve\n" \ ".globl " #name "\n" \ ".type " #name ", %gnu_indirect_function"); # endif # else /* !HAVE_IFUNC */ static void __attribute__ ((noreturn, used)) longjmp_compat (jmp_buf env, int val) { __libc_longjmp (env, val); } # define DEFINE_LONGJMP(name) strong_alias (longjmp_compat, name) # endif /* HAVE_IFUNC */ DEFINE_LONGJMP (longjmp_ifunc) compat_symbol (libpthread, longjmp_ifunc, longjmp, GLIBC_2_0); DEFINE_LONGJMP (siglongjmp_ifunc) compat_symbol (libpthread, siglongjmp_ifunc, siglongjmp, GLIBC_2_0); #endif