glibc/sysdeps/generic/crti.S
Florian Weimer f4349837d9 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.
2020-02-18 15:12:25 +01:00

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ArmAsm

/* 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