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2272ffc116
This patch removes ARM __ASSUME_SIGFRAME_V2 now that the 2.6.18-and-later signal frame layout can be assumed, renaming the affected functions accordingly now only one version of them is needed in glibc. (sigrestorer.S did not in fact include <kernel-features.h> and it appears that, unlike other such cases, it didn't get the header indirectly, so the v1 functions would have been compiled in even when sigaction.c didn't reference them.) (alpha and hppa also have architecture-specific __ASSUME_* macros that should now be removed: __ASSUME_FDATASYNC and __ASSUME_LWS_CAS respectively. I don't have any plans to do anything on that myself.) Tested on ARM. * sysdeps/unix/sysv/linux/arm/kernel-features.h (__ASSUME_SIGFRAME_V2): Remove macro. * sysdeps/unix/sysv/linux/arm/sigrestorer.S: Update comment. [!__ASSUME_SIGFRAME_V2]: Remove conditional code. (__default_sa_restorer_v2): Rename to __default_sa_restorer. (__default_rt_sa_restorer_v2): Rename to __default_rt_sa_restorer. * sysdeps/unix/sysv/linux/arm/sigaction.c (__default_sa_restorer): Declare as function. Remove conditional macro definitions. (__default_rt_sa_restorer): Likewise. (__default_sa_restorer_v1): Remove declaration. (__default_sa_restorer_v2): Likewise. (__default_rt_sa_restorer_v1): Likewise. (__default_rt_sa_restorer_v2): Likewise. * sysdeps/unix/sysv/linux/arm/Versions (GLIBC_PRIVATE): Remove __default_sa_restorer_v1, __default_rt_sa_restorer_v1, __default_sa_restorer_v2 and __default_rt_sa_restorer_v2.
85 lines
2.6 KiB
ArmAsm
85 lines
2.6 KiB
ArmAsm
/* Copyright (C) 1999-2014 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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#include <sysdep.h>
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/* If no SA_RESTORER function was specified by the application we use
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one of these. This avoids the need for the kernel to synthesise a return
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instruction on the stack, which would involve expensive cache flushes.
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Nowadays (2.6 series, and somewhat earlier) the kernel uses a high page
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for signal trampolines, so the cache flushes are not an issue. But since
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we do not have a vDSO, continue to use these so that we can provide
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unwind information.
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Start the unwind tables at least one instruction before the signal
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trampoline, because the unwinder will assume we are returning after
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a call site. */
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/* Used in ENTRY. */
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#undef cfi_startproc
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#define cfi_startproc \
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.cfi_startproc simple; \
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.cfi_signal_frame
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/* The CFA is not computed / used correctly here; this is neither trivial to
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do, nor is it needed. */
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#define CFI \
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cfi_def_cfa (sp, 0); \
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cfi_offset (r0, OFFSET + 0 * 4); \
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cfi_offset (r1, OFFSET + 1 * 4); \
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cfi_offset (r2, OFFSET + 2 * 4); \
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cfi_offset (r3, OFFSET + 3 * 4); \
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cfi_offset (r4, OFFSET + 4 * 4); \
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cfi_offset (r5, OFFSET + 5 * 4); \
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cfi_offset (r6, OFFSET + 6 * 4); \
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cfi_offset (r7, OFFSET + 7 * 4); \
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cfi_offset (r8, OFFSET + 8 * 4); \
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cfi_offset (r9, OFFSET + 9 * 4); \
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cfi_offset (r10, OFFSET + 10 * 4); \
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cfi_offset (r11, OFFSET + 11 * 4); \
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cfi_offset (r12, OFFSET + 12 * 4); \
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cfi_offset (r13, OFFSET + 13 * 4); \
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cfi_offset (r14, OFFSET + 14 * 4); \
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cfi_offset (r15, OFFSET + 15 * 4)
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#define OFFSET 32
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.fnstart
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.save {r0-r15}
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.pad #OFFSET
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nop
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ENTRY(__default_sa_restorer)
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CFI
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mov r7, $SYS_ify(sigreturn)
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swi 0x0
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.fnend
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END(__default_sa_restorer)
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#undef OFFSET
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#define OFFSET 160
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.fnstart
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.save {r0-r15}
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.pad #OFFSET
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nop
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ENTRY(__default_rt_sa_restorer)
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CFI
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mov r7, $SYS_ify(rt_sigreturn)
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swi 0x0
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.fnend
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END(__default_rt_sa_restorer)
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#undef OFFSET
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