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ARM: Consolidate NPTL/non versions of vfork
This commit is contained in:
Roland McGrath
parent
4f02e2b8f9
commit
5675da1e84
11
ChangeLog
11
ChangeLog
@ -1,3 +1,14 @@
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2014-05-14 Roland McGrath <roland@hack.frob.com>
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* sysdeps/unix/sysv/linux/arm/vfork.S: Include <tcb-offsets.h>.
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(__vfork): Incorporate save/restore of PID from nptl/vfork.S here.
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(__libc_vfork): New strong alias.
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* sysdeps/unix/sysv/linux/arm/nptl/vfork.S: File removed.
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* sysdeps/unix/sysv/linux/arm/nptl/pt-vfork.S: File removed.
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* nptl/pt-vfork.c: New file.
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* nptl/Versions (libc: GLIBC_PRIVATE): Add __libc_vfork.
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(libpthread: GLIBC_2.20): New version set (empty).
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2014-05-14 Will Newton <will.newton@linaro.org>
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* stdlib/gmp-impl.h: Test USE_STACK_ALLOC #ifdef
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@ -30,6 +30,7 @@ libc {
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__libc_alloca_cutoff;
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# Internal libc interface to libpthread
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__libc_dl_error_tsd;
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__libc_vfork;
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}
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}
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@ -257,6 +258,9 @@ libpthread {
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pthread_setattr_default_np;
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}
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GLIBC_2.20 {
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}
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GLIBC_PRIVATE {
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__pthread_initialize_minimal;
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__pthread_clock_gettime; __pthread_clock_settime;
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77
nptl/pt-vfork.c
Normal file
77
nptl/pt-vfork.c
Normal file
@ -0,0 +1,77 @@
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/* vfork ABI-compatibility entry points for libpthread.
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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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#include <unistd.h>
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#include <shlib-compat.h>
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/* libpthread used to have its own vfork implementation that differed
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from libc's only in having a pointless micro-optimization. There
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is no longer any use to having a separate copy in libpthread, but
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the historical ABI requires it. For static linking, there is no
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need to provide anything here--the libc version will be linked in.
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For shared library ABI compatibility, there must be __vfork and
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vfork symbols in libpthread.so; so we define them using IFUNC to
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redirect to the libc function. */
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#if (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
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|| SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
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extern __typeof (vfork) __libc_vfork; /* Defined in libc. */
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# ifdef HAVE_IFUNC
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attribute_hidden __attribute__ ((used))
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__typeof (vfork) *
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vfork_ifunc (void)
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{
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return &__libc_vfork;
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}
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# ifdef HAVE_ASM_SET_DIRECTIVE
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# define DEFINE_VFORK(name) \
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asm (".set " #name ", vfork_ifunc\n" \
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".globl " #name "\n" \
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".type " #name ", %gnu_indirect_function");
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# else
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# define DEFINE_VFORK(name) \
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asm (#name " = vfork_ifunc\n" \
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".globl " #name "\n" \
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".type " #name ", %gnu_indirect_function");
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# endif
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# else
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attribute_hidden
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pid_t
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vfork_compat (void)
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{
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return __libc_vfork ();
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}
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# define DEFINE_VFORK(name) weak_alias (vfork_compat, name)
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# endif
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#endif
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#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
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DEFINE_VFORK (vfork)
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#endif
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#if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
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DEFINE_VFORK (__vfork)
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#endif
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@ -1,34 +0,0 @@
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/* Copyright (C) 2005-2014 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 <tcb-offsets.h>
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/* Save the PID value. */
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#define SAVE_PID \
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GET_TLS (r2); \
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NEGOFF_ADJ_BASE2 (r2, r0, PID_OFFSET); /* Save the TLS addr in r2. */ \
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ldr r3, NEGOFF_OFF1 (r2, PID_OFFSET); /* Load the saved PID. */ \
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rsb r0, r3, #0; /* Negate it. */ \
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str r0, NEGOFF_OFF1 (r2, PID_OFFSET); /* Store the temp PID. */
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/* Restore the old PID value in the parent. */
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#define RESTORE_PID \
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cmp r0, #0; /* If we are the parent... */ \
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it ne; \
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strne r3, NEGOFF_OFF1 (r2, PID_OFFSET); /* restore the saved PID. */
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#include "../vfork.S"
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@ -1,36 +0,0 @@
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/* Copyright (C) 2005-2014 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 <tcb-offsets.h>
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/* Save the PID value. */
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#define SAVE_PID \
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GET_TLS (r2); \
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NEGOFF_ADJ_BASE2 (r2, r0, PID_OFFSET); /* Save the TLS addr in r2. */ \
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ldr r3, NEGOFF_OFF1 (r2, PID_OFFSET); /* Load the saved PID. */ \
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rsbs r0, r3, #0; /* Negate it. */ \
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it eq; \
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moveq r0, #0x80000000; /* Use 0x80000000 if it was 0. */ \
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str r0, NEGOFF_OFF1 (r2, PID_OFFSET); /* Store the temp PID. */
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/* Restore the old PID value in the parent. */
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#define RESTORE_PID \
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cmp r0, #0; /* If we are the parent... */ \
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it ne; \
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strne r3, NEGOFF_OFF1 (r2, PID_OFFSET); /* restore the saved PID. */
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#include "../vfork.S"
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@ -19,6 +19,8 @@
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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#include <tcb-offsets.h>
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/* Clone the calling process, but without copying the whole address space.
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The calling process is suspended until the new process exits or is
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@ -26,9 +28,16 @@
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and the process ID of the new process to the old process. */
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ENTRY (__vfork)
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#ifdef SAVE_PID
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SAVE_PID
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#endif
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/* Save the PID value. */
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GET_TLS (r2)
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NEGOFF_ADJ_BASE2 (r2, r0, PID_OFFSET) /* Save the TLS addr in r2. */
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ldr r3, NEGOFF_OFF1 (r2, PID_OFFSET) /* Load the saved PID. */
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rsbs r0, r3, #0 /* Negate it, and test for zero. */
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/* Use 0x80000000 if it was 0. See raise.c for how this is used. */
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it eq
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moveq r0, #0x80000000
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str r0, NEGOFF_OFF1 (r2, PID_OFFSET) /* Store the temp PID. */
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/* The DO_CALL macro saves r7 on the stack, to enable generation
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of ARM unwind info. Since the stack is initially shared between
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parent and child of vfork, that saved value could be corrupted.
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@ -46,10 +55,13 @@ ENTRY (__vfork)
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add sp, sp, #4
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cfi_adjust_cfa_offset (-4)
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mov r7, ip
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cfi_restore (r7);
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#ifdef RESTORE_PID
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RESTORE_PID
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#endif
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cfi_restore (r7)
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/* Restore the old PID value in the parent. */
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cmp r0, #0 /* If we are the parent... */
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it ne
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strne r3, NEGOFF_OFF1 (r2, PID_OFFSET) /* restore the saved PID. */
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cmn a1, #4096
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it cc
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RETINSTR(cc, lr)
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@ -59,3 +71,4 @@ PSEUDO_END (__vfork)
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libc_hidden_def (__vfork)
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weak_alias (__vfork, vfork)
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strong_alias (__vfork, __libc_vfork)
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