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bdc543e338
With the removal of divdi3 object from sparcv9-linux-gnu build, its definition came from libgcc and its functions internall calls .udiv. Since glibc also exports these symbols for compatibility reasons, it will end up creating PLT calls internally in libc.so. To avoid it, this patch uses the linker option --wrap to replace all the internal libc.so .udiv calls to the wrapper __wrap_.udiv. Along with strong alias in the udiv implementations, it makes linker do local calls. Checked on sparcv9-linux-gnu. * sysdeps/sparc/sparc32/Makefile (libc.so-gnulib): New rule. * sysdeps/sparc/sparc32/sparcv8/udiv.S (.udiv): Make a strong_alias to __wrap_.udiv. * sysdeps/sparc/sparc32/sparcv9/udiv.S (.udiv): Likewise. * sysdeps/sparc/sparc32/udiv.S (.udiv): Likewise.
56 lines
2.1 KiB
Makefile
56 lines
2.1 KiB
Makefile
# Copyright (C) 1991-2017 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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# 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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ifeq ($(subdir),gnulib)
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sysdep_routines = dotmul umul $(divrem) alloca
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endif # gnulib
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# We distribute these files, even though they are generated,
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# so as to avoid the need for a functioning m4 to build the library.
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divrem := sdiv udiv rem urem
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+divrem-NAME-sdiv := div
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+divrem-NAME-udiv := udiv
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+divrem-NAME-rem := rem
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+divrem-NAME-urem := urem
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+divrem-NAME = $(+divrem-NAME-$(basename $(notdir $@)))
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+divrem-OP-div := div
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+divrem-OP-udiv := div
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+divrem-OP-rem := rem
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+divrem-OP-urem := rem
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+divrem-S-div := true
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+divrem-S-rem := true
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+divrem-S-udiv := false
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+divrem-S-urem := false
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$(divrem:%=$(sysdep_dir)/sparc/sparc32/%.S): $(sysdep_dir)/sparc/sparc32/divrem.m4
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(echo "define(NAME,\`.$(+divrem-NAME)')\
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define(OP,\`$(+divrem-OP-$(+divrem-NAME))')\
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define(S,\`$(+divrem-S-$(+divrem-NAME))')\
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/* This file is generated from divrem.m4; DO NOT EDIT! */"; \
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cat $<) | $(M4) > $@-tmp
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# Make it unwritable so noone will edit it by mistake.
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-chmod a-w $@-tmp
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mv -f $@-tmp $@
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sysdep-realclean := $(sysdep-realclean) $(divrem:%=sysdeps/sparc/sparc32/%.S)
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# libgcc __divdi3 and __moddi3 uses .udiv and since it is also exported by
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# libc.so linker will create PLTs for the symbol. To avoid it we strong alias
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# the exported libc one to __wrap_.udiv and use linker option --wrap to make any
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# call to .udiv to call the wrapper symbol.
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libc.so-gnulib += -Wl,--wrap=.udiv
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