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commit edd8d70b91e1ccef549a7c668499596cc4d56ad1
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Author: Mihailo Stojanovic <mihailo.stojanovic@rt-rk.com>
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Date: Fri Aug 23 16:47:27 2019 +0000
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[MIPS] Raise highest supported EI_ABIVERSION value [BZ #24916]
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This bumps the highest valid EI_ABIVERSION value to ABSOLUTE ABI.
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New testcase loads the symbol from the GOT with the "lb" instruction
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so that the EI_ABIVERSION header field of the shared object is set
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to ABSOLUTE (it doesn't actually check the value of the symbol), and
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makes sure that the main executable is executed without "ABI version
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invalid" error.
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Tested for all three ABIs (o32, n32, n64) using both static linker which
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handles undefined weak symbols correctly [1] (and sets the EI_ABIVERSION
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of the test module) and the one that doesn't (EI_ABIVERSION left as 0).
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[1] https://sourceware.org/ml/binutils/2018-07/msg00268.html
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[BZ #24916]
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* sysdeps/mips/Makefile [$(subdir) = elf] (tests): Add
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tst-undefined-weak.
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[$(subdir) = elf] (modules-names): Add tst-undefined-weak-lib.
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[$(subdir) = elf] ($(objpfx)tst-undefined-weak): Add dependency.
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* sysdeps/mips/tst-undefined-weak-lib.S: New file.
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* sysdeps/mips/tst-undefined-weak.c: Likewise.
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* sysdeps/unix/sysv/linux/mips/ldsodefs.h (VALID_ELF_ABIVERSION):
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Increment highest valid ABIVERSION value.
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diff --git a/sysdeps/mips/Makefile b/sysdeps/mips/Makefile
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index 7ac6fa50311d60b7..6ad69e9ef9e88728 100644
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--- a/sysdeps/mips/Makefile
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+++ b/sysdeps/mips/Makefile
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@@ -82,3 +82,10 @@ $(objpfx)tst-mode-switch-2: $(shared-thread-library)
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endif
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endif
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endif
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+
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+ifeq ($(subdir),elf)
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+tests += tst-undefined-weak
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+modules-names += tst-undefined-weak-lib
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+
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+$(objpfx)tst-undefined-weak: $(objpfx)tst-undefined-weak-lib.so
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+endif
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diff --git a/sysdeps/mips/tst-undefined-weak-lib.S b/sysdeps/mips/tst-undefined-weak-lib.S
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new file mode 100644
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index 0000000000000000..a175ebf90e01b372
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--- /dev/null
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+++ b/sysdeps/mips/tst-undefined-weak-lib.S
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@@ -0,0 +1,43 @@
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+/* Undefined weak symbol loading shared module.
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+ Copyright (C) 2019 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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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+
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+#include <sgidefs.h>
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+
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+ .text
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+ .globl x
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+ .set nomips16
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+ .set nomicromips
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+ .ent x
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+ .type x, @function
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+x:
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+ .set noreorder
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+#if _MIPS_SIM == _ABIO32
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+ .cpload $25
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+ jr $31
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+ lb $2,%got(a)($28)
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+#else
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+ .cpsetup $25,$24,x
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+ lb $2,%got_disp(a)($28)
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+ jr $31
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+ .cpreturn
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+#endif
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+ .set reorder
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+ .end x
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+ .size x, .-x
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+ .weak a
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+ .hidden a
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diff --git a/sysdeps/mips/tst-undefined-weak.c b/sysdeps/mips/tst-undefined-weak.c
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new file mode 100644
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index 0000000000000000..1231da6912508c19
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--- /dev/null
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+++ b/sysdeps/mips/tst-undefined-weak.c
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@@ -0,0 +1,28 @@
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+/* Undefined weak symbol loading main executable.
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+ Copyright (C) 2019 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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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+
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+int *x (void);
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+
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+int
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+do_test (void)
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+{
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+ x ();
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+ return 0;
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+}
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+
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+#include <support/test-driver.c>
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diff --git a/sysdeps/unix/sysv/linux/mips/ldsodefs.h b/sysdeps/unix/sysv/linux/mips/ldsodefs.h
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index 68a0a99bb1f1ec85..d2912cadabfd6877 100644
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--- a/sysdeps/unix/sysv/linux/mips/ldsodefs.h
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+++ b/sysdeps/unix/sysv/linux/mips/ldsodefs.h
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@@ -34,7 +34,7 @@ extern void _dl_static_init (struct link_map *map);
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#undef VALID_ELF_ABIVERSION
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#define VALID_ELF_ABIVERSION(osabi,ver) \
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(ver == 0 \
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- || (osabi == ELFOSABI_SYSV && ver < 4) \
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+ || (osabi == ELFOSABI_SYSV && ver < 5) \
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|| (osabi == ELFOSABI_GNU && ver < LIBC_ABI_MAX))
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#endif /* ldsodefs.h */
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