From 3add8e1353d62d77fdd9b4ca363cdfe7006b0efb Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Wed, 8 Feb 2012 01:45:26 +0000 Subject: Support crti.S and crtn.S provided directly by architectures. --- sysdeps/i386/Makefile | 6 ---- sysdeps/i386/crti.S | 85 +++++++++++++++++++++++++++++++++++++++++++++++ sysdeps/i386/crtn.S | 48 ++++++++++++++++++++++++++ sysdeps/i386/elf/Makefile | 4 --- 4 files changed, 133 insertions(+), 10 deletions(-) create mode 100644 sysdeps/i386/crti.S create mode 100644 sysdeps/i386/crtn.S delete mode 100644 sysdeps/i386/elf/Makefile (limited to 'sysdeps') diff --git a/sysdeps/i386/Makefile b/sysdeps/i386/Makefile index 661473e..e1deece 100644 --- a/sysdeps/i386/Makefile +++ b/sysdeps/i386/Makefile @@ -5,12 +5,6 @@ asm-CPPFLAGS += -DGAS_SYNTAX # The i386 `long double' is a distinct type we support. long-double-fcts = yes -ifeq ($(subdir),csu) -# On i686 we must avoid generating the trampoline functions generated -# to get the GOT pointer. -CFLAGS-initfini.s += -march=i386 -mtune=i386 -endif - ifeq ($(subdir),gmon) sysdep_routines += i386-mcount endif diff --git a/sysdeps/i386/crti.S b/sysdeps/i386/crti.S new file mode 100644 index 0000000..dfec2cb --- /dev/null +++ b/sysdeps/i386/crti.S @@ -0,0 +1,85 @@ +/* Special .init and .fini section support for x86. + Copyright (C) 1995-2012 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + In addition to the permissions in the GNU Lesser General Public + License, the Free Software Foundation gives you unlimited + permission to link the compiled version of this file with other + programs, and to distribute those programs without any restriction + coming from the use of this file. (The GNU Lesser General Public + License restrictions do apply in other respects; for example, they + cover modification of the file, and distribution when not linked + into another program.) + + Note that people who make modified versions of this file are not + obligated to grant this special exception for their modified + versions; it is their choice whether to do so. The GNU Lesser + General Public License gives permission to release a modified + version without this exception; this exception also makes it + possible to release a modified version which carries forward this + exception. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +/* crti.S puts a function prologue at the beginning of the .init and + .fini sections and defines global symbols for those addresses, so + they can be called as functions. The symbols _init and _fini are + magic and cause the linker to emit DT_INIT and DT_FINI. */ + +#include +#include + +#ifndef PREINIT_FUNCTION +# define PREINIT_FUNCTION __gmon_start__ +#endif + +#ifndef PREINIT_FUNCTION_WEAK +# define PREINIT_FUNCTION_WEAK 1 +#endif + +#if PREINIT_FUNCTION_WEAK + weak_extern (PREINIT_FUNCTION) +#else + .hidden PREINIT_FUNCTION +#endif + + .section .init,"ax",@progbits + .p2align 2 + .globl _init + .type _init, @function +_init: + pushl %ebx + /* Maintain 16-byte stack alignment for called functions. */ + subl $8, %esp + LOAD_PIC_REG (bx) +#if PREINIT_FUNCTION_WEAK + movl PREINIT_FUNCTION@GOT(%ebx), %eax + testl %eax, %eax + je .Lno_weak_fn + call PREINIT_FUNCTION@PLT +.Lno_weak_fn: +#else + call PREINIT_FUNCTION +#endif + + .section .fini,"ax",@progbits + .p2align 2 + .globl _fini + .type _fini, @function +_fini: + pushl %ebx + subl $8, %esp + LOAD_PIC_REG (bx) diff --git a/sysdeps/i386/crtn.S b/sysdeps/i386/crtn.S new file mode 100644 index 0000000..2ea2a38 --- /dev/null +++ b/sysdeps/i386/crtn.S @@ -0,0 +1,48 @@ +/* Special .init and .fini section support for x86. + Copyright (C) 1995-2012 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + In addition to the permissions in the GNU Lesser General Public + License, the Free Software Foundation gives you unlimited + permission to link the compiled version of this file with other + programs, and to distribute those programs without any restriction + coming from the use of this file. (The GNU Lesser General Public + License restrictions do apply in other respects; for example, they + cover modification of the file, and distribution when not linked + into another program.) + + Note that people who make modified versions of this file are not + obligated to grant this special exception for their modified + versions; it is their choice whether to do so. The GNU Lesser + General Public License gives permission to release a modified + version without this exception; this exception also makes it + possible to release a modified version which carries forward this + exception. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +/* crtn.S puts function epilogues in the .init and .fini sections + corresponding to the prologues in crti.S. */ + + .section .init,"ax",@progbits + addl $8, %esp + popl %ebx + ret + + .section .fini,"ax",@progbits + addl $8, %esp + popl %ebx + ret diff --git a/sysdeps/i386/elf/Makefile b/sysdeps/i386/elf/Makefile deleted file mode 100644 index 61064d4..0000000 --- a/sysdeps/i386/elf/Makefile +++ /dev/null @@ -1,4 +0,0 @@ -ifeq ($(subdir),csu) -# Turn off -fasynchronous-unwind-tables -CFLAGS-initfini.s += -fno-asynchronous-unwind-tables -endif -- cgit v1.1