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authorFlorian Weimer <fweimer@redhat.com>2020-02-18 14:42:41 +0100
committerFlorian Weimer <fweimer@redhat.com>2020-02-18 15:12:25 +0100
commitf4349837d93b4dfe9ba09791e280ee2d6c99919f (patch)
tree2d9b57dc8a2b38bc369e0e0f89232046d8be38ca /sysdeps/generic/elf-initfini.h
parent6e05978f0c30e52420e086cc3156655471e6fb0a (diff)
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Introduce <elf-initfini.h> and ELF_INITFINI for all architectures
This supersedes the init_array sysdeps directory.  It allows us to
check for ELF_INITFINI in both C and assembler code, and skip DT_INIT
and DT_FINI processing completely on newer architectures.

A new header file is needed because <dl-machine.h> is incompatible
with assembler code.  <sysdep.h> is compatible with assembler code,
but it cannot be included in all assembler files because on some
architectures, it redefines register names, and some assembler files
conflict with that.

<elf-initfini.h> is replicated for legacy architectures which need
DT_INIT/DT_FINI support.  New architectures follow the generic default
and disable it.
Diffstat (limited to 'sysdeps/generic/elf-initfini.h')
-rw-r--r--sysdeps/generic/elf-initfini.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/sysdeps/generic/elf-initfini.h b/sysdeps/generic/elf-initfini.h
new file mode 100644
index 0000000000..75e920d283
--- /dev/null
+++ b/sysdeps/generic/elf-initfini.h
@@ -0,0 +1,24 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.
+   Copyright (C) 2020 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/>.  */
+
+/* Legacy platforms define this to 1.  If 0, the dynamic linker
+   ignores the DT_INIT and DT_FINI tags, and static binaries will not
+   call the _init or _fini functions.  If 1, the old constructor
+   mechanisms are used in addition to the initarray/finiarray
+   support.  */
+#define ELF_INITFINI 0