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[PATCH]: More precisely control crt* output on Sparc.
- From: David Miller <davem at davemloft dot net>
- To: libc-alpha at sourceware dot org
- Cc: jakub at redhat dot com
- Date: Thu, 01 May 2008 02:28:38 -0700 (PDT)
- Subject: [PATCH]: More precisely control crt* output on Sparc.
I noticed this while hacking on Gold sparc support a few
weeks ago.
If we're generating an 32-bit sparc glibc, with v9 optimizations,
the base CSU files should still only use the most basic sparc
instructions so that they do not get marked as v8+.
Otherwise, every application linked in userland gets marked this way
too.
Because doing things this way avoids the call_gmon_start() function in
the output, I did this for 64-bit sparc as well.
I did extra testing on this by installing the generated CSU files,
and running the Gold testsuite on 32-bit and 64-bit sparc.
Please apply, thanks!
2008-05-01 David S. Miller <davem@davemloft.net>
* sysdeps/sparc/sparc32/elf/initfini.c: New file.
* sysdeps/sparc/sparc64/elf/initfini.c: Likewise.
--- /dev/null 2008-03-03 20:22:44.000000000 -0800
+++ ./sysdeps/sparc/sparc32/elf/initfini.c 2008-04-20 20:03:34.000000000 -0700
@@ -0,0 +1,105 @@
+/* Special .init and .fini section support for sparc 32-bit.
+ Copyright (C) 2008 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. */
+
+/* This file is compiled into assembly code which is then munged by a sed
+ script into two files: crti.s and crtn.s.
+
+ * 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.
+
+ * crtn.s puts the corresponding function epilogues
+ in the .init and .fini sections.
+
+ We have special version for sparc because we want to use the most
+ minimal instruction set ISA so this doesn't get marked with using
+ v8plus or later. Otherwise, every application linked ends up
+ needing v8plus. */
+
+__asm__(" \n\
+#include \"defs.h\" \n\
+ \n\
+/*@HEADER_ENDS*/ \n\
+/*@_init_PROLOG_BEGINS*/ \n\
+ .section .init \n\
+ .section \".init\",#alloc,#execinstr \n\
+ .align 4 \n\
+ .globl _init \n\
+ .type _init, #function \n\
+_init: \n\
+ save %sp, -112, %sp \n\
+ sethi %hi(__gmon_start__), %o1 \n\
+ sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %o0 \n\
+ call 1f \n\
+ add %o0, %lo(_GLOBAL_OFFSET_TABLE_+4), %o0 \n\
+1: or %o1, %lo(__gmon_start__), %o1 \n\
+ add %o7, %o0, %o0 \n\
+ ld [%o0 + %o1], %o3 \n\
+ cmp %o3, 0 \n\
+ be 1f \n\
+ nop \n\
+ call __gmon_start__ \n\
+ nop \n\
+1: END_INIT \n\
+/*@_init_PROLOG_ENDS*/ \n\
+ \n\
+/*@_init_EPILOG_BEGINS*/ \n\
+ .section .init \n\
+ ret \n\
+ restore \n\
+ END_INIT \n\
+/*@_init_EPILOG_ENDS*/ \n\
+ \n\
+/*@_fini_PROLOG_BEGINS*/ \n\
+ .section .fini \n\
+ .section \".fini\",#alloc,#execinstr \n\
+ .align 4 \n\
+ .globl _fini \n\
+ .type _fini, #function \n\
+_fini: \n\
+ save %sp, -112, %sp \n\
+ END_FINI \n\
+/*@_fini_PROLOG_ENDS*/ \n\
+ \n\
+/*@_fini_EPILOG_BEGINS*/ \n\
+ .section .fini \n\
+ ret \n\
+ restore \n\
+ END_FINI \n\
+/*@_fini_EPILOG_ENDS*/ \n\
+/*@TRAILER_BEGINS*/ \n\
+ .weak __gmon_start__ \n\
+");
--- /dev/null 2008-03-03 20:22:44.000000000 -0800
+++ ./sysdeps/sparc/sparc64/elf/initfini.c 2008-04-20 20:33:30.000000000 -0700
@@ -0,0 +1,99 @@
+/* Special .init and .fini section support for sparc 64-bit.
+ Copyright (C) 2008 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. */
+
+/* This file is compiled into assembly code which is then munged by a sed
+ script into two files: crti.s and crtn.s.
+
+ * 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.
+
+ * crtn.s puts the corresponding function epilogues
+ in the .init and .fini sections. */
+
+__asm__(" \n\
+#include \"defs.h\" \n\
+ \n\
+/*@HEADER_ENDS*/ \n\
+/*@_init_PROLOG_BEGINS*/ \n\
+ .section .init \n\
+ .section \".init\",#alloc,#execinstr \n\
+ .align 4 \n\
+ .globl _init \n\
+ .type _init, #function \n\
+_init: \n\
+ save %sp, -192, %sp \n\
+ sethi %hi(__gmon_start__), %o1 \n\
+ sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %o0 \n\
+ call 1f \n\
+ add %o0, %lo(_GLOBAL_OFFSET_TABLE_+4), %o0 \n\
+1: or %o1, %lo(__gmon_start__), %o1 \n\
+ add %o7, %o0, %o0 \n\
+ ldx [%o0 + %o1], %o3 \n\
+ brz,pn %o3, 1f \n\
+ nop \n\
+ call __gmon_start__ \n\
+ nop \n\
+1: END_INIT \n\
+/*@_init_PROLOG_ENDS*/ \n\
+ \n\
+/*@_init_EPILOG_BEGINS*/ \n\
+ .section .init \n\
+ ret \n\
+ restore \n\
+ END_INIT \n\
+/*@_init_EPILOG_ENDS*/ \n\
+ \n\
+/*@_fini_PROLOG_BEGINS*/ \n\
+ .section .fini \n\
+ .section \".fini\",#alloc,#execinstr \n\
+ .align 4 \n\
+ .globl _fini \n\
+ .type _fini, #function \n\
+_fini: \n\
+ save %sp, -192, %sp \n\
+ END_FINI \n\
+/*@_fini_PROLOG_ENDS*/ \n\
+ \n\
+/*@_fini_EPILOG_BEGINS*/ \n\
+ .section .fini \n\
+ ret \n\
+ restore \n\
+ END_FINI \n\
+/*@_fini_EPILOG_ENDS*/ \n\
+/*@TRAILER_BEGINS*/ \n\
+ .weak __gmon_start__ \n\
+");