2010-09-27 21:48:20 +02:00
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/* Thread library support for -fsplit-stack. */
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2015-01-05 13:33:28 +01:00
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/* Copyright (C) 2009-2015 Free Software Foundation, Inc.
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2010-09-27 21:48:20 +02:00
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Contributed by Ian Lance Taylor <iant@google.com>.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "tconfig.h"
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#include "tsystem.h"
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#include "coretypes.h"
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#include "tm.h"
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Move libgcc_tm_file to toplevel libgcc
gcc:
* configure.ac (libgcc_tm_file_list, libgcc_tm_include_list):
Remove.
* configure: Regenerate.
* Makefile.in (libgcc_tm_file_list, libgcc_tm_include_list): Remove.
(TM_H): Remove libgcc_tm.h, $(libgcc_tm_file_list).
(libgcc_tm.h, cs-libgcc_tm.h): Remove.
(clean): Remove libgcc_tm.h
* mkconfig.sh: Don't include libgcc_tm.h in tm.h.
* config.gcc (libgcc_tm_file): Remove.
(arm*-*-linux*): Remove libgcc_tm_file for arm*-*-linux-*eabi.
(arm*-*-uclinux*): Remove libgcc_tm_file for arm*-*-uclinux*eabi.
(arm*-*-eabi*, arm*-*-symbianelf*): Remove libgcc_tm_file.
(avr-*-rtems*): Likewise.
(avr-*-*): Likewise.
(frv-*-elf): Likewise.
(frv-*-*linux*): Likewise.
(h8300-*-rtems*): Likewise.
(h8300-*-elf*): Likewise.
(i[34567]86-*-darwin*): Likewise.
(x86_64-*-darwin*): Likewise.
(rx-*-elf*): Likewise.
(tic6x-*-elf): Likewise.
(tic6x-*-uclinux): Likewise.
(i[34567]86-*-linux*, x86_64-*-linux*): Likewise.
libgcc:
* configure.ac (tm_file_): New variable.
Determine from tm_file.
(tm_file, tm_defines): Substitute.
* configure: Regenerate.
* mkheader.sh: New file.
* Makefile.in (clean): Remove libgcc_tm.h.
($(objects)): Depend on libgcc_tm.h.
(libgcc_tm_defines, libgcc_tm_file): New variables.
(libgcc_tm.h, libgcc_tm.stamp): New targets.
($(libgcc-objects), $(libgcc-s-objects), $(libgcc-eh-objects))
($(libgcov-objects), $(libunwind-objects), $(libunwind-s-objects))
($(extra-parts)): Depend on libgcc_tm.h.
* config.host (tm_defines, tm_file): New variable.
(arm*-*-linux*): Set tm_file for arm*-*-linux-*eabi.
(arm*-*-uclinux*): Set tm_file for arm*-*-uclinux*eabi.
(arm*-*-eabi*, arm*-*-symbianelf*): Set tm_file.
(avr-*-rtems*): Likewise.
(avr-*-*): Likewise.
(frv-*-elf): Likewise.
(frv-*-*linux*): Likewise.
(h8300-*-rtems*): Likewise.
(h8300-*-elf*): Likewise.
(i[34567]86-*-darwin*): Likewise.
(x86_64-*-darwin*): Likewise.
(rx-*-elf): Likewise.
(tic6x-*-uclinux): Likewise.
(tic6x-*-elf): Likewise.
(i[34567]86-*-linux*, x86_64-*-linux*): Likewise.
* config/alpha/gthr-posix.c: Include libgcc_tm.h.
* config/i386/cygming-crtbegin.c: Likewise.
* config/i386/cygming-crtend.c: Likewise.
* config/ia64/fde-vms.c: Likewise.
* config/ia64/unwind-ia64.c: Likewise.
* config/libbid/bid_gcc_intrinsics.h: Likewise.
* config/rs6000/darwin-fallback.c: Likewise.
* config/stormy16/lib2funcs.c: Likewise.
* config/xtensa/unwind-dw2-xtensa.c: Likewise.
* crtstuff.c: Likewise.
* dfp-bit.h: Likewise.
* emutls.c: Likewise.
* fixed-bit.c: Likewise.
* fp-bit.c: Likewise.
* generic-morestack-thread.c: Likewise.
* generic-morestack.c: Likewise.
* libgcc2.c: Likewise.
* libgcov.c: Likewise.
* unwind-dw2-fde-dip.c: Likewise.
* unwind-dw2-fde.c: Likewise.
* unwind-dw2.c: Likewise.
* unwind-sjlj.c: Likewise.
Co-Authored-By: Paolo Bonzini <bonzini@gnu.org>
From-SVN: r180775
2011-11-02 16:26:35 +01:00
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#include "libgcc_tm.h"
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2010-09-27 21:48:20 +02:00
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/* If inhibit_libc is defined, we can not compile this file. The
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effect is that people will not be able to use -fsplit-stack. That
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is much better than failing the build particularly since people
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will want to define inhibit_libc while building a compiler which
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can build glibc. */
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#ifndef inhibit_libc
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2011-10-08 00:52:28 +02:00
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#include <errno.h>
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2010-09-27 21:48:20 +02:00
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#include <pthread.h>
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#include "generic-morestack.h"
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/* We declare the pthread functions we need as weak, so that
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libgcc_s.so does not need to be linked against -lpthread. */
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extern int pthread_once (pthread_once_t *, void (*) (void))
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__attribute__ ((weak));
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extern int pthread_key_create (pthread_key_t *, void (*) (void *))
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__attribute__ ((weak));
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extern int pthread_setspecific (pthread_key_t, const void *)
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__attribute__ ((weak));
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/* The key for the list of stack segments to free when the thread
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exits. This is created by pthread_key_create. */
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static pthread_key_t segment_list_key;
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/* Used to only run create_key once. */
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static pthread_once_t create_key_once = PTHREAD_ONCE_INIT;
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/* Release all the segments for a thread. This is the destructor
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function used by pthread_key_create, and is called when a thread
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exits. */
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static void
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free_segments (void* arg)
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{
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__morestack_release_segments ((struct stack_segment **) arg, 1);
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}
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/* Set up the key for the list of segments. This is called via
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pthread_once. */
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static void
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create_key (void)
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{
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int err;
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err = pthread_key_create (&segment_list_key, free_segments);
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if (err != 0)
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{
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static const char msg[] = "pthread_key_create failed: errno ";
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__morestack_fail (msg, sizeof msg - 1, err);
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}
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}
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/* Pass information from the pthread_create wrapper to
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stack_split_initialize_thread. */
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struct pthread_create_args
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{
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void *(*start_routine) (void *);
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void *arg;
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};
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/* Initialize a thread. This is called via pthread_create. It calls
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a target dependent function to set up any required stack guard. */
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static void* stack_split_initialize_thread (void *)
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__attribute__ ((no_split_stack));
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static void *
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stack_split_initialize_thread (void *varg)
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{
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struct pthread_create_args *args = (struct pthread_create_args *) varg;
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int err;
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void *(*start_routine) (void *);
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void *arg;
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__stack_split_initialize ();
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err = pthread_setspecific (segment_list_key, (void *) &__morestack_segments);
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if (err != 0)
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{
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static const char msg[] = "pthread_setspecific failed: errno ";
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__morestack_fail (msg, sizeof msg - 1, err);
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}
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start_routine = args->start_routine;
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arg = args->arg;
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free (args);
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return (*start_routine) (arg);
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}
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/* This function wraps calls to pthread_create to make sure that the
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stack guard is initialized for new threads. FIXME: This hack will
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not be necessary if glibc supports -fsplit-stack directly. */
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int __wrap_pthread_create (pthread_t *, const pthread_attr_t *,
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void *(*start_routine) (void *), void *)
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__attribute__ ((visibility ("hidden")));
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extern int __real_pthread_create (pthread_t *, const pthread_attr_t *,
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2013-01-14 20:38:07 +01:00
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void *(*start_routine) (void *), void *)
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__attribute__ ((weak));
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2010-09-27 21:48:20 +02:00
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int
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__wrap_pthread_create (pthread_t *tid, const pthread_attr_t *attr,
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void *(*start_routine) (void *), void *arg)
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{
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int err;
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struct pthread_create_args* args;
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err = pthread_once (&create_key_once, create_key);
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if (err != 0)
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{
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static const char msg[] = "pthread_once failed: errno ";
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__morestack_fail (msg, sizeof msg - 1, err);
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}
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args = malloc (sizeof (struct pthread_create_args));
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if (args == NULL)
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return EAGAIN;
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args->start_routine = start_routine;
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args->arg = arg;
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return __real_pthread_create (tid, attr, stack_split_initialize_thread, args);
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}
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#endif /* !defined (inhibit_libc) */
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