Differential D17587 Diff 49573 lib/csu/common/crtbegin.c

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lib/csu/common/crtbegin.c

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				/*-
				* SPDX-License-Identifier: BSD-1-Clause
				*
				* Copyright 2018 Andrew Turner
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
				* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
				* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
				emasteUnsubmitted Not Done Inline Actions I think we should avoid having a binary redistribution clause in these components that are linked into every output binary by the toolchain. emaste: I think we should avoid having a binary redistribution clause in these components that are…
				andrewAuthorUnsubmitted Done Inline Actions We already include it in many other csu files. andrew: We already include it in many other csu files.
				emasteUnsubmitted Not Done Inline Actions Aha, we already have 1-clause BSD in the tree, we ought to use that. SPDX link: https://spdx.org/licenses/BSD-1-Clause.html Their reference: https://svnweb.freebsd.org/base/head/include/ifaddrs.h?revision=326823 Tag: `SPDX-License-Identifier: BSD-1-Clause` emaste: Aha, we already have 1-clause BSD in the tree, we ought to use that. SPDX link: https://spdx.
				* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
				* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
				* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
				* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
				* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
				* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
				* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
				*/

				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/param.h>

				#include "crt.h"

				typedef void (*crt_func)(void);

				/*
				* On some architectures and toolchains we may need to call the .dtors.
				* These are called in the order they are in the ELF file.
				*/
				#ifdef HAVE_CTORS
				static void __do_global_dtors_aux(void) __used;

				crt_func __CTOR_LIST__[] __section(".ctors") __hidden = {
				(crt_func)-1
				};
				crt_func __DTOR_LIST__[] __section(".dtors") __hidden = {
				(crt_func)-1
				};

				static void
				__do_global_dtors_aux(void)
				{
				crt_func fn;
				int n;

				for (n = 1;; n++) {
				fn = __DTOR_LIST__[n];
				if (fn == (crt_func)0 \|\| fn == (crt_func)-1)
				break;
				fn();
				}
				}

				asm (
				".pushsection .fini \n"
				"\t" INIT_CALL_SEQ(__do_global_dtors_aux) "\n"
				".popsection \n"
				);
				#endif

				/*
				* Handler for gcj. These provide a _Jv_RegisterClasses function and fill
				* out the .jcr section. We just need to call this function with a pointer
				* to the appropriate section.
				*/
				extern void _Jv_RegisterClasses(void *) __weak_symbol;
				static void register_classes(void) __used;

				crt_func __JCR_LIST__[] __section(".jcr") __used __hidden = { };

				#ifndef CTORS_CONSTRUCTORS
				__attribute__((constructor))
				#endif
				static void
				register_classes(void)
				{

				if (_Jv_RegisterClasses != NULL && __JCR_LIST__[0] != 0)
				kibUnsubmitted Not Done Inline Actions It is better to use .pushsection there kib: It is better to use .pushsection there
				_Jv_RegisterClasses(__JCR_LIST__);
				}
				kibUnsubmitted Not Done Inline Actions ... and .popsection there. That said, why do you put this for amd64 at all ? _NOINIT note is put into the binaries on all arches, meaning that rtld calls init/init_array elements for the dynamic binaries (and crt1 calls them for static), kib: ... and .popsection there. That said, why do you put this for amd64 at all ? _NOINIT note is…
				andrewAuthorUnsubmitted Done Inline Actions I have a test [1] the `.ctors` & `.dtors` are run. Without this they aren't. I included this for compatibility with old toolchains that use these sections. [1] https://github.com/zxombie/initfini andrew: I have a test [1] the `.ctors` & `.dtors` are run. Without this they aren't. I included this…
				kibUnsubmitted Not Done Inline Actions There should be \t before instruction/asm pseudo-ops. kib: There should be \t before instruction/asm pseudo-ops.

				/*
				* We can't use constructors when they use the .ctors section as they may be
				* placed before __CTOR_LIST__.
				*/
				#ifdef CTORS_CONSTRUCTORS
				asm (
				".pushsection .init \n"
				"\t" INIT_CALL_SEQ(register_classes) "\n"
				".popsection \n"
				);
				#endif