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Add sysdeps/init_array to produce empty crt[in].o and use .preinit_array for gcrt1.o
This commit is contained in:
Roland McGrath
parent
e6b5a29364
commit
9967e003b3
13
ChangeLog
13
ChangeLog
@ -1,3 +1,16 @@
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2013-03-12 Roland McGrath <roland@hack.frob.com>
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* sysdeps/init_array/elf-init.c: New file.
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* csu/elf-init.c
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(__libc_csu_init) [!NO_INITFINI]: Conditionalize _init call on this.
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(__libc_csu_fini) [!NO_INITFINI]: Conditionalize _fini call on this.
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* csu/gmon-start.c [GMON_START_ARRAY_SECTION]: Don't define
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__gmon_start__ as global, but as static with a .preinit_array pointer.
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* sysdeps/init_array/gmon-start.c: New file. Use that.
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* sysdeps/init_array/crti.S: New file, empty except for comments.
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* sysdeps/init_array/crtn.S: Likewise.
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2013-03-11 Ondřej Bílka <neleai@seznam.cz>
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* sysdeps/x86_64/memset.S: Remove USE_MULTIARCH conditional for
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@ -49,10 +49,13 @@ extern void (*__fini_array_start []) (void) attribute_hidden;
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extern void (*__fini_array_end []) (void) attribute_hidden;
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#ifndef NO_INITFINI
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/* These function symbols are provided for the .init/.fini section entry
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points automagically by the linker. */
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extern void _init (void);
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extern void _fini (void);
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#endif
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/* These functions are passed to __libc_start_main by the startup code.
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These get statically linked into each program. For dynamically linked
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@ -76,7 +79,9 @@ __libc_csu_init (int argc, char **argv, char **envp)
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}
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#endif
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#ifndef NO_INITFINI
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_init ();
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#endif
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const size_t size = __init_array_end - __init_array_start;
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for (size_t i = 0; i < size; i++)
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@ -94,6 +99,8 @@ __libc_csu_fini (void)
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while (i-- > 0)
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(*__fini_array_start [i]) ();
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# ifndef NO_INITFINI
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_fini ();
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# endif
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#endif
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}
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@ -59,10 +59,17 @@ extern char etext[];
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# endif
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#endif
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#ifdef GMON_START_ARRAY_SECTION
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static void __gmon_start__ (void);
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static void (*const gmon_start_initializer) (void)
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__attribute__ ((used, section (GMON_START_ARRAY_SECTION))) = &__gmon_start__;
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static
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#else
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/* We cannot use the normal constructor mechanism to call
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__gmon_start__ because gcrt1.o appears before crtbegin.o in the link.
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Instead crti.o calls it specially. */
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extern void __gmon_start__ (void);
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#endif
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void
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__gmon_start__ (void)
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13
sysdeps/init_array/crti.S
Normal file
13
sysdeps/init_array/crti.S
Normal file
@ -0,0 +1,13 @@
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/* Dummy crti file.
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In this configuration, crti.o and crtn.o are both empty because the
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.init_array/.fini_array sections are used exclusively.
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Older ports cannot use this because even if the linker used to
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build libc itself has .init_array support, we don't want to produce
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a crt[in].o that presume a linker that new will be used to link
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other things later.
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But new configurations without compatibility concerns for
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toolchains without .init_array support can use this to avoid the
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superfluous .init and .fini boilerplate code. */
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13
sysdeps/init_array/crtn.S
Normal file
13
sysdeps/init_array/crtn.S
Normal file
@ -0,0 +1,13 @@
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/* Dummy crtn file.
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In this configuration, crti.o and crtn.o are both empty because the
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.init_array/.fini_array sections are used exclusively.
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Older ports cannot use this because even if the linker used to
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build libc itself has .init_array support, we don't want to produce
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a crt[in].o that presume a linker that new will be used to link
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other things later.
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But new configurations without compatibility concerns for
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toolchains without .init_array support can use this to avoid the
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superfluous .init and .fini boilerplate code. */
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37
sysdeps/init_array/elf-init.c
Normal file
37
sysdeps/init_array/elf-init.c
Normal file
@ -0,0 +1,37 @@
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/* Startup support for ELF initializers/finalizers in the main executable.
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Copyright (C) 2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file with other
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programs, and to distribute those programs without any restriction
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coming from the use of this file. (The GNU Lesser General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into another program.)
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Note that people who make modified versions of this file are not
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obligated to grant this special exception for their modified
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versions; it is their choice whether to do so. The GNU Lesser
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General Public License gives permission to release a modified
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version without this exception; this exception also makes it
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possible to release a modified version which carries forward this
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exception.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#define NO_INITFINI
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#include <csu/elf-init.c>
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41
sysdeps/init_array/gmon-start.c
Normal file
41
sysdeps/init_array/gmon-start.c
Normal file
@ -0,0 +1,41 @@
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/* gmon startup hook using .preinit_array.
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Copyright (C) 2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file with other
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programs, and to distribute those programs without any restriction
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coming from the use of this file. (The GNU Lesser General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into another program.)
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Note that people who make modified versions of this file are not
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obligated to grant this special exception for their modified
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versions; it is their choice whether to do so. The GNU Lesser
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General Public License gives permission to release a modified
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version without this exception; this exception also makes it
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possible to release a modified version which carries forward this
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exception.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* Instead of defining __gmon_start__ globally in gcrt1.o, we make it
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static and just put a pointer to it into the .preinit_array section. */
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#define GMON_START_ARRAY_SECTION ".preinit_array"
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#include <csu/gmon-start.c>
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