diff options
Diffstat (limited to 'erts/emulator/hipe/hipe_x86_signal.c')
| -rw-r--r-- | erts/emulator/hipe/hipe_x86_signal.c | 219 |
1 files changed, 90 insertions, 129 deletions
diff --git a/erts/emulator/hipe/hipe_x86_signal.c b/erts/emulator/hipe/hipe_x86_signal.c index 8f997aafab..50d08b96d3 100644 --- a/erts/emulator/hipe/hipe_x86_signal.c +++ b/erts/emulator/hipe/hipe_x86_signal.c @@ -2,18 +2,19 @@ * %CopyrightBegin% * - * Copyright Ericsson AB 2001-2013. All Rights Reserved. + * Copyright Ericsson AB 2001-2016. All Rights Reserved. * - * The contents of this file are subject to the Erlang Public License, - * Version 1.1, (the "License"); you may not use this file except in - * compliance with the License. You should have received a copy of the - * Erlang Public License along with this software. If not, it can be - * retrieved online at http://www.erlang.org/. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at * - * Software distributed under the License is distributed on an "AS IS" - * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See - * the License for the specific language governing rights and limitations - * under the License. + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. * * %CopyrightEnd% */ @@ -37,9 +38,6 @@ * * Our solution is to override the C library's signal handler setup * procedure with our own which enforces the SA_ONSTACK flag. - * - * XXX: This code only supports Linux with glibc-2.1 or above, - * and Solaris 8. */ #ifdef HAVE_CONFIG_H #include "config.h" @@ -54,27 +52,6 @@ #include "hipe_signal.h" #if __GLIBC__ == 2 && (__GLIBC_MINOR__ >= 3) -/* See comment below for glibc 2.2. */ -#ifndef __USE_GNU -#define __USE_GNU /* to un-hide RTLD_NEXT */ -#endif -#include <dlfcn.h> -static int (*__next_sigaction)(int, const struct sigaction*, struct sigaction*); -#define init_done() (__next_sigaction != 0) -extern int __sigaction(int, const struct sigaction*, struct sigaction*); -#define __SIGACTION __sigaction -static void do_init(void) -{ - __next_sigaction = dlsym(RTLD_NEXT, "__sigaction"); - if (__next_sigaction != 0) - return; - perror("dlsym"); - abort(); -} -#define INIT() do { if (!init_done()) do_init(); } while (0) -#endif /* glibc 2.3 */ - -#if __GLIBC__ == 2 && (__GLIBC_MINOR__ == 2 /*|| __GLIBC_MINOR__ == 3*/) /* * __libc_sigaction() is the core routine. * Without libpthread, sigaction() and __sigaction() are both aliases @@ -99,65 +76,14 @@ static void do_init(void) * old BSD or SysV interfaces. * glibc's internal calls to __sigaction() appear to be mostly safe. * hipe_signal_init() fixes some unsafe ones, e.g. the SIGPROF handler. - * - * Tested with glibc-2.1.92 on RedHat 7.0, glibc-2.2.2 on RedHat 7.1, - * glibc-2.2.4 on RedHat 7.2, and glibc-2.2.5 on RedHat 7.3. */ -#if 0 -/* works with 2.2.5 and 2.2.4, but not 2.2.2 or 2.1.92 */ +#ifndef __USE_GNU #define __USE_GNU /* to un-hide RTLD_NEXT */ -#include <dlfcn.h> -static int (*__next_sigaction)(int, const struct sigaction*, struct sigaction*); -#define init_done() (__next_sigaction != 0) -#define __SIGACTION __sigaction -static void do_init(void) -{ - __next_sigaction = dlsym(RTLD_NEXT, "__sigaction"); - if (__next_sigaction != 0) - return; - perror("dlsym"); - abort(); -} -#define INIT() do { if (!init_done()) do_init(); } while (0) -#else -/* semi-works with all 2.2 versions so far */ -extern int __sigaction(int, const struct sigaction*, struct sigaction*); -#define __next_sigaction __sigaction /* pthreads-aware version */ -#undef __SIGACTION /* we can't override __sigaction() */ -#define INIT() do{}while(0) #endif -#endif /* glibc 2.2 */ - -#if __GLIBC__ == 2 && __GLIBC_MINOR__ == 1 -/* - * __sigaction() is the core routine. - * Without libpthread, sigaction() is an alias for __sigaction(). - * libpthread redefines sigaction() as a non-trivial wrapper around - * __sigaction(). - * glibc has internal calls to both sigaction() and __sigaction(). - * - * Overriding __sigaction() would be ideal, but doing so breaks - * libpthread (threads hang). Instead we override sigaction() and - * use dlsym RTLD_NEXT to find glibc's version of sigaction(). - * glibc's internal calls to __sigaction() appear to be mostly safe. - * hipe_signal_init() fixes some unsafe ones, e.g. the SIGPROF handler. - * - * Tested with glibc-2.1.3 on RedHat 6.2. - */ -#include <dlfcn.h> -static int (*__next_sigaction)(int, const struct sigaction*, struct sigaction*); -#define init_done() (__next_sigaction != 0) -#undef __SIGACTION -static void do_init(void) -{ - __next_sigaction = dlsym(RTLD_NEXT, "sigaction"); - if (__next_sigaction != 0) - return; - perror("dlsym"); - abort(); -} -#define INIT() do { if (!init_done()) do_init(); } while (0) -#endif /* glibc 2.1 */ +#define NEXT_SIGACTION "__sigaction" +#define LIBC_SIGACTION __sigaction +#define OVERRIDE_SIGACTION +#endif /* glibc >= 2.3 */ /* Is there no standard identifier for Darwin/MacOSX ? */ #if defined(__APPLE__) && defined(__MACH__) && !defined(__DARWIN__) @@ -180,24 +106,13 @@ static void do_init(void) * The other _sigaction, _sigaction_no_bind I don't understand the purpose * of and don't modify. */ -#include <dlfcn.h> -static int (*__next_sigaction)(int, const struct sigaction*, struct sigaction*); -#define init_done() (__next_sigaction != 0) -extern int _sigaction(int, const struct sigaction*, struct sigaction*); -#define __SIGACTION _sigaction -static void do_init(void) -{ - __next_sigaction = dlsym(RTLD_NEXT, "sigaction"); - if (__next_sigaction != 0) - return; - perror("dlsym_darwin"); - abort(); -} +#define NEXT_SIGACTION "sigaction" +#define LIBC_SIGACTION _sigaction +#undef OVERRIDE_SIGACTION #define _NSIG NSIG -#define INIT() do { if (!init_done()) do_init(); } while (0) #endif /* __DARWIN__ */ -#if !defined(__GLIBC__) && !defined(__DARWIN__) && !defined(__NetBSD__) +#if defined(__sun__) /* * Assume Solaris/x86 2.8. * There is a number of sigaction() procedures in libc: @@ -217,28 +132,76 @@ static void do_init(void) * our init routine has had a chance to find _sigaction()'s address. * This forces us to initialise at the first call. */ +#define NEXT_SIGACTION "_sigaction" +#define LIBC_SIGACTION _sigaction +#define OVERRIDE_SIGACTION +#define _NSIG NSIG +#endif /* __sun__ */ + +#if defined(__FreeBSD__) +/* + * This is a copy of Darwin code for FreeBSD. + * CAVEAT: detailed semantics are not verified yet. + */ +#define NEXT_SIGACTION "sigaction" +#define LIBC_SIGACTION _sigaction +#undef OVERRIDE_SIGACTION +#define _NSIG NSIG +#endif /* __FreeBSD__ */ + +#if defined(__NetBSD__) +/* + * Note: This is only stub code to allow the build to succeed. + * Whether this actually provides the needed overrides for safe + * signal delivery or not is unknown. + */ +#undef NEXT_SIGACTION +#undef OVERRIDE_SIGACTION +#endif /* __NetBSD__ */ + +#if !(defined(__GLIBC__) || defined(__DARWIN__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__sun__)) +/* + * Unknown libc -- assume musl. Note: musl deliberately does not provide a musl-specific + * feature test macro, so we cannot check for it. + * + * sigaction is a weak alias for __sigaction, which is a wrapper for __libc_sigaction. + * There are libc-internal calls to __libc_sigaction which install handlers, so we must + * override __libc_sigaction rather than __sigaction. + */ +#define NEXT_SIGACTION "__libc_sigaction" +#define LIBC_SIGACTION __libc_sigaction +#define OVERRIDE_SIGACTION +#ifndef _NSIG +#define _NSIG NSIG +#endif +#endif /* !(__GLIBC__ || __DARWIN__ || __NetBSD__ || __FreeBSD__ || __sun__) */ + +#if defined(NEXT_SIGACTION) +/* + * Initialize a function pointer to the libc core sigaction routine, + * to be used by our wrappers. + */ #include <dlfcn.h> -static int (*__next_sigaction)(int, const struct sigaction*, struct sigaction*); -#define init_done() (__next_sigaction != 0) -#define __SIGACTION _sigaction +static int (*next_sigaction)(int, const struct sigaction*, struct sigaction*); static void do_init(void) { - __next_sigaction = dlsym(RTLD_NEXT, "_sigaction"); - if (__next_sigaction != 0) + next_sigaction = dlsym(RTLD_NEXT, NEXT_SIGACTION); + if (next_sigaction != 0) return; perror("dlsym"); abort(); } -#define _NSIG NSIG -#define INIT() do { if (!init_done()) do_init(); } while (0) -#endif /* not glibc or darwin */ +#define INIT() do { if (!next_sigaction) do_init(); } while (0) +#else /* !defined(NEXT_SIGACTION) */ +#define INIT() do { } while (0) +#endif /* !defined(NEXT_SIGACTION) */ -#if !defined(__NetBSD__) +#if defined(NEXT_SIGACTION) /* * This is our wrapper for sigaction(). sigaction() can be called before * hipe_signal_init() has been executed, especially when threads support * has been linked with the executable. Therefore, we must initialise - * __next_sigaction() dynamically, the first time it's needed. + * next_sigaction() dynamically, the first time it's needed. */ static int my_sigaction(int signum, const struct sigaction *act, struct sigaction *oldact) { @@ -254,24 +217,26 @@ static int my_sigaction(int signum, const struct sigaction *act, struct sigactio newact.sa_flags |= SA_ONSTACK; act = &newact; } - return __next_sigaction(signum, act, oldact); + return next_sigaction(signum, act, oldact); } #endif + +#if defined(LIBC_SIGACTION) /* * This overrides the C library's core sigaction() procedure, catching * all its internal calls. */ -#ifdef __SIGACTION -int __SIGACTION(int signum, const struct sigaction *act, struct sigaction *oldact) +extern int LIBC_SIGACTION(int, const struct sigaction*, struct sigaction*); +int LIBC_SIGACTION(int signum, const struct sigaction *act, struct sigaction *oldact) { return my_sigaction(signum, act, oldact); } #endif +#if defined(OVERRIDE_SIGACTION) /* * This catches the application's own sigaction() calls. */ -#if !defined(__DARWIN__) && !defined(__NetBSD__) int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact) { return my_sigaction(signum, act, oldact); @@ -286,15 +251,11 @@ static void hipe_sigaltstack(void *ss_sp) stack_t ss; ss.ss_sp = ss_sp; - ss.ss_flags = SS_ONSTACK; + ss.ss_flags = 0; ss.ss_size = SIGSTKSZ; if (sigaltstack(&ss, NULL) < 0) { - /* might be a broken pre-2.4 Linux kernel, try harder */ - ss.ss_flags = 0; - if (sigaltstack(&ss, NULL) < 0) { - perror("sigaltstack"); - abort(); - } + perror("sigaltstack"); + abort(); } } @@ -304,7 +265,9 @@ static void hipe_sigaltstack(void *ss_sp) */ void hipe_thread_signal_init(void) { - hipe_sigaltstack(erts_alloc(ERTS_ALC_T_HIPE, SIGSTKSZ)); + /* Stack don't really need to be cache aligned. + We use it to suppress false leak report from valgrind */ + hipe_sigaltstack(erts_alloc_permanent_cache_aligned(ERTS_ALC_T_HIPE, SIGSTKSZ)); } #endif @@ -329,9 +292,7 @@ void hipe_signal_init(void) struct sigaction sa; int i; -#ifndef __NetBSD__ INIT(); -#endif hipe_sigaltstack_init(); |