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ARM: Disable compat mcount code when unneeded.
This commit is contained in:
Roland McGrath
parent
649ecea212
commit
bc2ba20ae8
@ -1,3 +1,7 @@
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2014-01-10 Roland McGrath <roland@hack.frob.com>
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* sysdeps/generic/gcc-compat.h: New file.
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2014-01-10 Siddhesh Poyarekar <siddhesh@redhat.com>
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* benchtests/asin-inputs: Correct slow inputs.
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@ -1,3 +1,14 @@
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2014-01-10 Roland McGrath <roland@hack.frob.com>
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* sysdeps/arm/arm-mcount.S:
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#include <shlib-compat.h> and <gcc-compat.h>.
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(_mcount): Renamed to __mcount_arm_compat. Made conditional on
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[GCC_COMPAT (4, 3) || SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_19)].
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(_mcount, mcount): Define (as aliases) only under [GCC_COMPAT (4, 3)],
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with compat_symbol under [SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_19)].
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* sysdeps/arm/gcc-compat.h: New file.
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2014-01-01 Joseph Myers <joseph@codesourcery.com>
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* sysdeps/arm/libm-test-ulps: Regenerated.
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@ -7,7 +18,9 @@
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* sysdeps/arm/fegetround.c (fegetround): Use libm_hidden_def.
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2013-11-26 Ondřej Bílka <neleai@seznam.cz>
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* sysdeps/unix/sysv/linux/arm/bits/shm.h: Use __glibc_reserved instead __unused.
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* sysdeps/unix/sysv/linux/arm/bits/shm.h: Use __glibc_reserved
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instead of __unused.
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2013-11-22 Roland McGrath <roland@hack.frob.com>
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@ -21,6 +21,7 @@
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#include <sysdep.h>
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#undef mcount
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#ifdef __thumb2__
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.thumb
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@ -65,10 +66,20 @@ ENTRY(__gnu_mcount_nc)
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END(__gnu_mcount_nc)
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#include <gcc-compat.h>
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#include <shlib-compat.h>
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/* The new __gnu_mcount_nc entry point was introduced in 4.4, so the
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static library needs the old one only to support older compilers.
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Even in a configuration that only cares about newer compilers, the
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shared library might need it only for strict ABI compatibility. */
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#if GCC_COMPAT (4, 3) || SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_19)
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/* Provide old mcount for backwards compatibility. This requires
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code be compiled with APCS frame pointers. */
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ENTRY(_mcount)
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ENTRY(__mcount_arm_compat)
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push {r0, r1, r2, r3, fp, lr}
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cfi_adjust_cfa_offset (24)
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cfi_rel_offset (r0, 0)
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@ -83,7 +94,7 @@ ENTRY(_mcount)
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ldrne r0, [\B, #-4]
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movsne r1, lr
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blne __mcount_internal
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#if defined (__ARM_ARCH_4T__) && defined (__THUMB_INTERWORK__)
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# if defined (__ARM_ARCH_4T__) && defined (__THUMB_INTERWORK__)
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pop {r0, r1, r2, r3, fp, lr}
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cfi_adjust_cfa_offset (-24)
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cfi_restore (r0)
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@ -93,12 +104,26 @@ ENTRY(_mcount)
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cfi_restore (fp)
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cfi_restore (lr)
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bx lr
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#else
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# else
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pop {r0, r1, r2, r3, fp, pc}
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# endif
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END(__mcount_arm_compat)
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#endif
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END(_mcount)
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#if GCC_COMPAT (4, 3)
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strong_alias (__mcount_arm_compat, _mcount)
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/* The canonical name for the function is `_mcount' in both C and asm,
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but some old asm code might assume it's `mcount'. */
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#undef mcount
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weak_alias (_mcount, mcount)
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#elif SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_19)
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compat_symbol (libc, __mcount_arm_compat, _mcount, GLIBC_2_0)
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strong_alias (__mcount_arm_compat, __mcount_arm_compat_1)
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compat_symbol (libc, __mcount_arm_compat_1, mcount, GLIBC_2_0)
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#endif
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35
ports/sysdeps/arm/gcc-compat.h
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35
ports/sysdeps/arm/gcc-compat.h
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@ -0,0 +1,35 @@
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/* Macros for checking required GCC compatibility. ARM version.
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Copyright (C) 2014 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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#ifndef _ARM_GCC_COMPAT_H
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#define _ARM_GCC_COMPAT_H 1
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#ifndef GCC_COMPAT_VERSION
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# ifdef __ARM_PCS_VFP
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/* The hard-float ABI was first supported in 4.5. */
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# define GCC_COMPAT_VERSION GCC_VERSION (4, 5)
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# else
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/* The EABI configurations (the only ones we handle) were first supported
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in 4.1. */
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# define GCC_COMPAT_VERSION GCC_VERSION (4, 1)
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# endif
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#endif
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#include_next <gcc-compat.h>
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#endif
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42
sysdeps/generic/gcc-compat.h
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42
sysdeps/generic/gcc-compat.h
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@ -0,0 +1,42 @@
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/* Macros for checking required GCC compatibility. Generic version.
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Copyright (C) 2014 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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/* This is the base file. More-specific sysdeps/.../gcc-compat.h files
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can define GCC_COMPAT_VERSION and then #include_next this file. */
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#ifndef _GENERIC_GCC_COMPAT_H
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#define _GENERIC_GCC_COMPAT_H 1
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/* This is the macro that gets used in #if tests in code: true iff
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the library we build must be compatible with user code built by
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GCC version MAJOR.MINOR. */
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#define GCC_COMPAT(major, minor) \
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(GCC_COMPAT_VERSION <= GCC_VERSION (major, minor))
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/* This is how we compose an integer from major and minor version
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numbers, for comparison. */
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#define GCC_VERSION(major, minor) \
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(((major) << 16) + (minor))
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#ifndef GCC_COMPAT_VERSION
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/* GCC 2.7.2 was current at the time of the glibc-2.0 release.
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We assume nothing before that ever mattered. */
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# define GCC_COMPAT_VERSION GCC_VERSION (2, 7)
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#endif
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#endif
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