diff options
Diffstat (limited to 'sysdeps/generic')
-rw-r--r-- | sysdeps/generic/crti.S | 33 | ||||
-rw-r--r-- | sysdeps/generic/crtn.S | 19 | ||||
-rw-r--r-- | sysdeps/generic/elf-initfini.h | 24 |
3 files changed, 76 insertions, 0 deletions
diff --git a/sysdeps/generic/crti.S b/sysdeps/generic/crti.S new file mode 100644 index 0000000000..82d6dc0d91 --- /dev/null +++ b/sysdeps/generic/crti.S @@ -0,0 +1,33 @@ +/* Dummy crti file. + + In this configuration, crti.o and crtn.o are both empty because the + .init_array/.fini_array sections are used exclusively. + + Older ports cannot use this because even if the linker used to + build libc itself has .init_array support, we don't want to produce + a crt[in].o that presume a linker that new will be used to link + other things later. + + But new configurations without compatibility concerns for + toolchains without .init_array support can use this to avoid the + superfluous .init and .fini boilerplate code. */ + +#include <elf-initfini.h> + +#if ELF_INITFINI +# error Cannot use default crti.S because it lacks _init code +#endif + +#ifdef PREINIT_FUNCTION + +# if PREINIT_FUNCTION_WEAK +# error PREINIT_FUNCTION_WEAK is unsupported +# endif + +/* This arranges for PREINIT_FUNCTION to be called upon loading a library that + contains crti.o. */ + + .section .init_array,"a",%init_array + .dc.a PREINIT_FUNCTION + +#endif diff --git a/sysdeps/generic/crtn.S b/sysdeps/generic/crtn.S new file mode 100644 index 0000000000..d92b07dd0b --- /dev/null +++ b/sysdeps/generic/crtn.S @@ -0,0 +1,19 @@ +/* Dummy crtn file. + + In this configuration, crti.o and crtn.o are both empty because the + .init_array/.fini_array sections are used exclusively. + + Older ports cannot use this because even if the linker used to + build libc itself has .init_array support, we don't want to produce + a crt[in].o that presume a linker that new will be used to link + other things later. + + But new configurations without compatibility concerns for + toolchains without .init_array support can use this to avoid the + superfluous .init and .fini boilerplate code. */ + +#include <elf-initfini.h> + +#if ELF_INITFINI +# error Cannot use genetric crtn.S because it lacks _fini code +#endif 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 |