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65 lines
2.3 KiB
Diff
65 lines
2.3 KiB
Diff
commit bdc543e338281da051b3dc06eae96c330a485ce6
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Date: Thu Mar 16 09:15:57 2017 -0300
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sparc: Fix .udiv plt on libc
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With the removal of divdi3 object from sparcv9-linux-gnu build, its
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definition came from libgcc and its functions internall calls .udiv.
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Since glibc also exports these symbols for compatibility reasons, it
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will end up creating PLT calls internally in libc.so.
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To avoid it, this patch uses the linker option --wrap to replace all
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the internal libc.so .udiv calls to the wrapper __wrap_.udiv. Along
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with strong alias in the udiv implementations, it makes linker do
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local calls.
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Checked on sparcv9-linux-gnu.
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* sysdeps/sparc/sparc32/Makefile (libc.so-gnulib): New rule.
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* sysdeps/sparc/sparc32/sparcv8/udiv.S (.udiv): Make a strong_alias
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to __wrap_.udiv.
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* sysdeps/sparc/sparc32/sparcv9/udiv.S (.udiv): Likewise.
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* sysdeps/sparc/sparc32/udiv.S (.udiv): Likewise.
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---
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sysdeps/sparc/sparc32/Makefile | 6 ++++++
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sysdeps/sparc/sparc32/sparcv8/udiv.S | 1 +
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sysdeps/sparc/sparc32/sparcv9/udiv.S | 1 +
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sysdeps/sparc/sparc32/udiv.S | 1 +
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4 files changed, 9 insertions(+)
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--- a/sysdeps/sparc/sparc32/Makefile
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+++ b/sysdeps/sparc/sparc32/Makefile
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@@ -47,3 +47,9 @@
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mv -f $@-tmp $@
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sysdep-realclean := $(sysdep-realclean) $(divrem:%=sysdeps/sparc/sparc32/%.S)
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+
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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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--- a/sysdeps/sparc/sparc32/sparcv8/udiv.S
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+++ b/sysdeps/sparc/sparc32/sparcv8/udiv.S
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@@ -13,3 +13,4 @@
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udiv %o0, %o1, %o0
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END(.udiv)
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+strong_alias (.udiv, __wrap_.udiv)
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--- a/sysdeps/sparc/sparc32/sparcv9/udiv.S
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+++ b/sysdeps/sparc/sparc32/sparcv9/udiv.S
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@@ -15,3 +15,4 @@
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udiv %o0, %o1, %o0
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END(.udiv)
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+strong_alias (.udiv, __wrap_.udiv)
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--- a/sysdeps/sparc/sparc32/udiv.S
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+++ b/sysdeps/sparc/sparc32/udiv.S
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@@ -344,3 +344,4 @@
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mov %o2, %o0
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END(.udiv)
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+strong_alias (.udiv, __wrap_.udiv)
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