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glibc/sysdeps/generic/crti.S

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Add sysdeps/init_array to produce empty crt[in].o and use .preinit_array for gcrt1.o
2013-03-12 19:47:36 +00:00
/* 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. */
sysdeps/init_array: Add PREINIT_FUNCTION to crti.S The RISC-V port contains a crti.S that simply contains a link to PREINIT_FUNCTION (when defined). As this should be entirely generic, Joseph Myers suggested that we update the generic init_array version to contain this. Since RISC-V is the only user of init_array this won't break any existing ports. 2018-01-29 Palmer Dabbelt <palmer@sifive.com> * sysdeps/init_array/crti.S (.section .init_array): Add PREINIT_FUNCTION when defined.
2018-01-25 18:33:18 +00:00
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 13:42:41 +00:00
#include <elf-initfini.h>
sysdeps/init_array: Add PREINIT_FUNCTION to crti.S The RISC-V port contains a crti.S that simply contains a link to PREINIT_FUNCTION (when defined). As this should be entirely generic, Joseph Myers suggested that we update the generic init_array version to contain this. Since RISC-V is the only user of init_array this won't break any existing ports. 2018-01-29 Palmer Dabbelt <palmer@sifive.com> * sysdeps/init_array/crti.S (.section .init_array): Add PREINIT_FUNCTION when defined.
2018-01-25 18:33:18 +00:00
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 13:42:41 +00:00
#if ELF_INITFINI
# error Cannot use default crti.S because it lacks _init code
sysdeps/init_array: Add PREINIT_FUNCTION to crti.S The RISC-V port contains a crti.S that simply contains a link to PREINIT_FUNCTION (when defined). As this should be entirely generic, Joseph Myers suggested that we update the generic init_array version to contain this. Since RISC-V is the only user of init_array this won't break any existing ports. 2018-01-29 Palmer Dabbelt <palmer@sifive.com> * sysdeps/init_array/crti.S (.section .init_array): Add PREINIT_FUNCTION when defined.
2018-01-25 18:33:18 +00:00
#endif
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 13:42:41 +00:00
#ifdef PREINIT_FUNCTION
# if PREINIT_FUNCTION_WEAK
# error PREINIT_FUNCTION_WEAK is unsupported
# endif
sysdeps/init_array: Add PREINIT_FUNCTION to crti.S The RISC-V port contains a crti.S that simply contains a link to PREINIT_FUNCTION (when defined). As this should be entirely generic, Joseph Myers suggested that we update the generic init_array version to contain this. Since RISC-V is the only user of init_array this won't break any existing ports. 2018-01-29 Palmer Dabbelt <palmer@sifive.com> * sysdeps/init_array/crti.S (.section .init_array): Add PREINIT_FUNCTION when defined.
2018-01-25 18:33:18 +00:00
/* 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
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