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author | Florian Weimer <fweimer@redhat.com> | 2020-02-18 14:42:41 +0100 |
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committer | Florian Weimer <fweimer@redhat.com> | 2020-02-18 15:12:25 +0100 |
commit | f4349837d93b4dfe9ba09791e280ee2d6c99919f (patch) | |
tree | 2d9b57dc8a2b38bc369e0e0f89232046d8be38ca /sysdeps/generic/crti.S | |
parent | 6e05978f0c30e52420e086cc3156655471e6fb0a (diff) | |
download | glibc-f4349837d93b4dfe9ba09791e280ee2d6c99919f.tar.gz glibc-f4349837d93b4dfe9ba09791e280ee2d6c99919f.tar.xz glibc-f4349837d93b4dfe9ba09791e280ee2d6c99919f.zip |
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/crti.S')
-rw-r--r-- | sysdeps/generic/crti.S | 33 |
1 files changed, 33 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 |