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ARM: Consolidate NPTL/non versions of vfork

This commit is contained in:
Roland McGrath 2014-05-14 09:44:24 -07:00
parent 4f02e2b8f9
commit 5675da1e84
6 changed files with 112 additions and 77 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
2014-05-14 Roland McGrath <roland@hack.frob.com>
* sysdeps/unix/sysv/linux/arm/vfork.S: Include <tcb-offsets.h>.
(__vfork): Incorporate save/restore of PID from nptl/vfork.S here.
(__libc_vfork): New strong alias.
* sysdeps/unix/sysv/linux/arm/nptl/vfork.S: File removed.
* sysdeps/unix/sysv/linux/arm/nptl/pt-vfork.S: File removed.
* nptl/pt-vfork.c: New file.
* nptl/Versions (libc: GLIBC_PRIVATE): Add __libc_vfork.
(libpthread: GLIBC_2.20): New version set (empty).
2014-05-14 Will Newton <will.newton@linaro.org>
* stdlib/gmp-impl.h: Test USE_STACK_ALLOC #ifdef

4
nptl/Versions
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@ -30,6 +30,7 @@ libc {
__libc_alloca_cutoff;
# Internal libc interface to libpthread
__libc_dl_error_tsd;
__libc_vfork;
}
}
@ -257,6 +258,9 @@ libpthread {
pthread_setattr_default_np;
}
GLIBC_2.20 {
}
GLIBC_PRIVATE {
__pthread_initialize_minimal;
__pthread_clock_gettime; __pthread_clock_settime;

77
nptl/pt-vfork.c Normal file
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@ -0,0 +1,77 @@
/* vfork ABI-compatibility entry points for libpthread.
Copyright (C) 2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <unistd.h>
#include <shlib-compat.h>
/* libpthread used to have its own vfork implementation that differed
from libc's only in having a pointless micro-optimization. There
is no longer any use to having a separate copy in libpthread, but
the historical ABI requires it. For static linking, there is no
need to provide anything here--the libc version will be linked in.
For shared library ABI compatibility, there must be __vfork and
vfork symbols in libpthread.so; so we define them using IFUNC to
redirect to the libc function. */
#if (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
|| SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
extern __typeof (vfork) __libc_vfork; /* Defined in libc. */
# ifdef HAVE_IFUNC
attribute_hidden __attribute__ ((used))
__typeof (vfork) *
vfork_ifunc (void)
{
return &__libc_vfork;
}
# ifdef HAVE_ASM_SET_DIRECTIVE
# define DEFINE_VFORK(name) \
asm (".set " #name ", vfork_ifunc\n" \
".globl " #name "\n" \
".type " #name ", %gnu_indirect_function");
# else
# define DEFINE_VFORK(name) \
asm (#name " = vfork_ifunc\n" \
".globl " #name "\n" \
".type " #name ", %gnu_indirect_function");
# endif
# else
attribute_hidden
pid_t
vfork_compat (void)
{
return __libc_vfork ();
}
# define DEFINE_VFORK(name) weak_alias (vfork_compat, name)
# endif
#endif
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
DEFINE_VFORK (vfork)
#endif
#if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
DEFINE_VFORK (__vfork)
#endif

34
sysdeps/unix/sysv/linux/arm/nptl/pt-vfork.S
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@ -1,34 +0,0 @@
/* Copyright (C) 2005-2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#include <tcb-offsets.h>
/* Save the PID value. */
#define SAVE_PID \
GET_TLS (r2); \
NEGOFF_ADJ_BASE2 (r2, r0, PID_OFFSET); /* Save the TLS addr in r2. */ \
ldr r3, NEGOFF_OFF1 (r2, PID_OFFSET); /* Load the saved PID. */ \
rsb r0, r3, #0; /* Negate it. */ \
str r0, NEGOFF_OFF1 (r2, PID_OFFSET); /* Store the temp PID. */
/* Restore the old PID value in the parent. */
#define RESTORE_PID \
cmp r0, #0; /* If we are the parent... */ \
it ne; \
strne r3, NEGOFF_OFF1 (r2, PID_OFFSET); /* restore the saved PID. */
#include "../vfork.S"

36
sysdeps/unix/sysv/linux/arm/nptl/vfork.S
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@ -1,36 +0,0 @@
/* Copyright (C) 2005-2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#include <tcb-offsets.h>
/* Save the PID value. */
#define SAVE_PID \
GET_TLS (r2); \
NEGOFF_ADJ_BASE2 (r2, r0, PID_OFFSET); /* Save the TLS addr in r2. */ \
ldr r3, NEGOFF_OFF1 (r2, PID_OFFSET); /* Load the saved PID. */ \
rsbs r0, r3, #0; /* Negate it. */ \
it eq; \
moveq r0, #0x80000000; /* Use 0x80000000 if it was 0. */ \
str r0, NEGOFF_OFF1 (r2, PID_OFFSET); /* Store the temp PID. */
/* Restore the old PID value in the parent. */
#define RESTORE_PID \
cmp r0, #0; /* If we are the parent... */ \
it ne; \
strne r3, NEGOFF_OFF1 (r2, PID_OFFSET); /* restore the saved PID. */
#include "../vfork.S"

27
sysdeps/unix/sysv/linux/arm/vfork.S
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@ -19,6 +19,8 @@
#include <sysdep.h>
#define _ERRNO_H 1
#include <bits/errno.h>
#include <tcb-offsets.h>
/* Clone the calling process, but without copying the whole address space.
The calling process is suspended until the new process exits or is
@ -26,9 +28,16 @@
and the process ID of the new process to the old process. */
ENTRY (__vfork)
#ifdef SAVE_PID
SAVE_PID
#endif
/* Save the PID value. */
GET_TLS (r2)
NEGOFF_ADJ_BASE2 (r2, r0, PID_OFFSET) /* Save the TLS addr in r2. */
ldr r3, NEGOFF_OFF1 (r2, PID_OFFSET) /* Load the saved PID. */
rsbs r0, r3, #0 /* Negate it, and test for zero. */
/* Use 0x80000000 if it was 0. See raise.c for how this is used. */
it eq
moveq r0, #0x80000000
str r0, NEGOFF_OFF1 (r2, PID_OFFSET) /* Store the temp PID. */
/* The DO_CALL macro saves r7 on the stack, to enable generation
of ARM unwind info. Since the stack is initially shared between
parent and child of vfork, that saved value could be corrupted.
@ -46,10 +55,13 @@ ENTRY (__vfork)
add sp, sp, #4
cfi_adjust_cfa_offset (-4)
mov r7, ip
cfi_restore (r7);
#ifdef RESTORE_PID
RESTORE_PID
#endif
cfi_restore (r7)
/* Restore the old PID value in the parent. */
cmp r0, #0 /* If we are the parent... */
it ne
strne r3, NEGOFF_OFF1 (r2, PID_OFFSET) /* restore the saved PID. */
cmn a1, #4096
it cc
RETINSTR(cc, lr)
@ -59,3 +71,4 @@ PSEUDO_END (__vfork)
libc_hidden_def (__vfork)
weak_alias (__vfork, vfork)
strong_alias (__vfork, __libc_vfork)