include/lapi/rt_sigaction.h - platform/external/ltp - Git at Google

 /*
  * Copyright (c) 2009 Cisco Systems, Inc.  All Rights Reserved.
  * Copyright (c) 2009 FUJITSU LIMITED.  All Rights Reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of version 2 of the GNU General Public License as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it would be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  *
  * Further, this software is distributed without any warranty that it is
  * free of the rightful claim of any third person regarding infringement
  * or the like.  Any license provided herein, whether implied or
  * otherwise, applies only to this software file.  Patent licenses, if
  * any, provided herein do not apply to combinations of this program with
  * other software, or any other product whatsoever.
  *
  * You should have received a copy of the GNU General Public License along
  * with this program; if not, write the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Author: Liu Bo <liubo2009@cn.fujitsu.com>
  * Author: Ngie Cooper <yaneurabeya@gmail.com>
  *
  */

 #ifndef LTP_RT_SIGACTION_H
 #define LTP_RT_SIGACTION_H

 #include "ltp_signal.h"

 #define INVAL_SA_PTR ((void *)-1)

 #if defined(__mips__)
 struct kernel_sigaction {
 	unsigned int sa_flags;
 	__sighandler_t k_sa_handler;
 	sigset_t sa_mask;
 };
 #else
 struct kernel_sigaction {
 	__sighandler_t k_sa_handler;
 	unsigned long sa_flags;
 	void (*sa_restorer) (void);
 	sigset_t sa_mask;
 };
 #endif

 /* This macro marks if (struct sigaction) has .sa_restorer member */
 #if !defined(__ia64__) && !defined(__alpha__) && !defined(__hppa__) && !defined(__mips__)
 # define HAVE_SA_RESTORER
 #endif

 #ifdef __x86_64__

 /*
  * From asm/signal.h -- this value isn't exported anywhere outside of glibc and
  * asm/signal.h and is only required for the rt_sig* function family because
  * sigaction(2), et all, appends this if necessary to
  * (struct sigaction).sa_flags. HEH.
  *
  * I do #undef though, just in case...
  *
  * Also, from .../arch/x86/kernel/signal.c:448 for v2.6.30 (something or
  * other):
  *
  * x86-64 should always use SA_RESTORER.
  *
  * -- thus SA_RESTORER must always be defined along with
  * (struct sigaction).sa_restorer for this architecture.
  */
 #undef SA_RESTORER
 #define SA_RESTORER     0x04000000

 void (*restore_rt)(void);

 static void handler_h(int signal)
 {
 	return;
 }

 /* Setup an initial signal handler for signal number = sig for x86_64. */
 static inline int sig_initial(int sig)
 {
 	int ret_code = -1;
 	struct sigaction act, oact;

 	act.sa_handler = handler_h;
 	act.sa_flags = 0;
 	/* Clear out the signal set. */
 	if (sigemptyset(&act.sa_mask) < 0) {
 		/* Add the signal to the mask set. */
 	} else if (sigaddset(&act.sa_mask, sig) < 0) {
 		/* Set act.sa_restorer via syscall(2) */
 	} else if (sigaction(sig, &act, &oact) < 0) {
 		/* Copy oact.sa_restorer via syscall(2) */
 	} else if (sigaction(sig, &act, &oact) < 0) {
 		/* And voila -- we just tricked the kernel into giving us our
 		 * restorer function! */
 	} else {
 		restore_rt = oact.sa_restorer;
 		ret_code = 0;
 	}

 	return ret_code;
 }

 #endif /* __x86_64__ */

 #ifdef __sparc__
 # if defined __arch64__ || defined __sparcv9

 /*
  * Based on glibc/sysdeps/unix/sysv/linux/sparc/sparc64/sigaction.c
  */

 extern char *__rt_sig_stub;

 static void __attribute__((used)) __rt_sigreturn_stub(void)
 {
 	__asm__ ("__rt_sig_stub: mov %0, %%g1\n\t"
 		"ta  0x6d\n\t"
 		: /* no outputs */
 		: "i" (__NR_rt_sigreturn));
 }

 # else /* sparc32 */

 /*
  * Based on glibc/sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c
  */

 extern char *__rt_sig_stub, *__sig_stub;

 static void __attribute__((used)) __rt_sigreturn_stub(void)
 {
 	__asm__ ("__rt_sig_stub: mov %0, %%g1\n\t"
 		"ta  0x10\n\t"
 		: /* no outputs */
 		: "i" (__NR_rt_sigreturn));
 }

 static void __attribute__((used)) __sigreturn_stub(void)
 {
 	__asm__ ("__sig_stub: mov %0, %%g1\n\t"
 		"ta  0x10\n\t"
 		: /* no outputs */
 		: "i" (__NR_sigreturn));
 }

 # endif
 #endif /* __sparc__ */

 #ifdef __arc__

 #undef SA_RESTORER
 #define SA_RESTORER     0x04000000

 /*
  * based on uClibc/libc/sysdeps/linux/arc/sigaction.c
  */
 static void
 __attribute__ ((optimize("Os"))) __attribute__((used)) restore_rt(void)
 {
 	__asm__ (
 		"mov r8, %0	\n\t"
 #ifdef __ARCHS__
 		"trap_s	0	\n\t"
 #else
 		"trap0	\n\t"
 #endif
 		: /* no outputs */
 		: "i" (__NR_rt_sigreturn)
 		: "r8");
 }
 #endif

 /* This is a wrapper for __NR_rt_sigaction syscall.
  * act/oact values of INVAL_SA_PTR is used to pass
  * an invalid pointer to syscall(__NR_rt_sigaction)
  *
  * Based on glibc/sysdeps/unix/sysv/linux/{...}/sigaction.c
  */

 static int ltp_rt_sigaction(int signum, const struct sigaction *act,
 			struct sigaction *oact, size_t sigsetsize)
 {
 	int ret;
 	struct kernel_sigaction kact, koact;
 	struct kernel_sigaction *kact_p = NULL;
 	struct kernel_sigaction *koact_p = NULL;

 	if (act == INVAL_SA_PTR) {
 		kact_p = INVAL_SA_PTR;
 	} else if (act) {
 		kact.k_sa_handler = act->sa_handler;
 		memcpy(&kact.sa_mask, &act->sa_mask, sizeof(sigset_t));
 		kact.sa_flags = act->sa_flags;
 #ifndef __mips__
 		kact.sa_restorer = NULL;
 #endif
 		kact_p = &kact;
 	}

 	if (oact == INVAL_SA_PTR)
 		koact_p = INVAL_SA_PTR;
 	else if (oact)
 		koact_p = &koact;

 #ifdef __x86_64__
 	sig_initial(signum);
 #endif

 #if defined __x86_64__ || defined __arc__
 	kact.sa_flags |= SA_RESTORER;
 	kact.sa_restorer = restore_rt;
 #endif

 #ifdef __sparc__
 	unsigned long stub = 0;
 # if defined __arch64__ || defined __sparcv9
 	stub = ((unsigned long) &__rt_sig_stub) - 8;
 # else /* sparc32 */
 	if ((kact.sa_flags & SA_SIGINFO) != 0)
 		stub = ((unsigned long) &__rt_sig_stub) - 8;
 	else
 		stub = ((unsigned long) &__sig_stub) - 8;
 # endif
 #endif


 #ifdef __sparc__
 	ret = ltp_syscall(__NR_rt_sigaction, signum,
 			kact_p, koact_p,
 			stub, sigsetsize);
 #else
 	ret = ltp_syscall(__NR_rt_sigaction, signum,
 			kact_p, koact_p,
 			sigsetsize);
 #endif

 	if (ret >= 0) {
 		if (oact && (oact != INVAL_SA_PTR)) {
 			oact->sa_handler = koact.k_sa_handler;
 			memcpy(&oact->sa_mask, &koact.sa_mask,
 				sizeof(sigset_t));
 			oact->sa_flags = koact.sa_flags;
 #ifdef HAVE_SA_RESTORER
 			oact->sa_restorer = koact.sa_restorer;
 #endif
 		}
 	}

 	return ret;
 }

 #endif /* LTP_RT_SIGACTION_H */
	/*
	* Copyright (c) 2009 Cisco Systems, Inc. All Rights Reserved.
	* Copyright (c) 2009 FUJITSU LIMITED. All Rights Reserved.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of version 2 of the GNU General Public License as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it would be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	*
	* Further, this software is distributed without any warranty that it is
	* free of the rightful claim of any third person regarding infringement
	* or the like. Any license provided herein, whether implied or
	* otherwise, applies only to this software file. Patent licenses, if
	* any, provided herein do not apply to combinations of this program with
	* other software, or any other product whatsoever.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Author: Liu Bo <liubo2009@cn.fujitsu.com>
	* Author: Ngie Cooper <yaneurabeya@gmail.com>
	*
	*/

	#ifndef LTP_RT_SIGACTION_H
	#define LTP_RT_SIGACTION_H

	#include "ltp_signal.h"

	#define INVAL_SA_PTR ((void *)-1)

	#if defined(__mips__)
	struct kernel_sigaction {
	unsigned int sa_flags;
	__sighandler_t k_sa_handler;
	sigset_t sa_mask;
	};
	#else
	struct kernel_sigaction {
	__sighandler_t k_sa_handler;
	unsigned long sa_flags;
	void (*sa_restorer) (void);
	sigset_t sa_mask;
	};
	#endif

	/* This macro marks if (struct sigaction) has .sa_restorer member */
	#if !defined(__ia64__) && !defined(__alpha__) && !defined(__hppa__) && !defined(__mips__)
	# define HAVE_SA_RESTORER
	#endif

	#ifdef __x86_64__

	/*
	* From asm/signal.h -- this value isn't exported anywhere outside of glibc and
	* asm/signal.h and is only required for the rt_sig* function family because
	* sigaction(2), et all, appends this if necessary to
	* (struct sigaction).sa_flags. HEH.
	*
	* I do #undef though, just in case...
	*
	* Also, from .../arch/x86/kernel/signal.c:448 for v2.6.30 (something or
	* other):
	*
	* x86-64 should always use SA_RESTORER.
	*
	* -- thus SA_RESTORER must always be defined along with
	* (struct sigaction).sa_restorer for this architecture.
	*/
	#undef SA_RESTORER
	#define SA_RESTORER 0x04000000

	void (*restore_rt)(void);

	static void handler_h(int signal)
	{
	return;
	}

	/* Setup an initial signal handler for signal number = sig for x86_64. */
	static inline int sig_initial(int sig)
	{
	int ret_code = -1;
	struct sigaction act, oact;

	act.sa_handler = handler_h;
	act.sa_flags = 0;
	/* Clear out the signal set. */
	if (sigemptyset(&act.sa_mask) < 0) {
	/* Add the signal to the mask set. */
	} else if (sigaddset(&act.sa_mask, sig) < 0) {
	/* Set act.sa_restorer via syscall(2) */
	} else if (sigaction(sig, &act, &oact) < 0) {
	/* Copy oact.sa_restorer via syscall(2) */
	} else if (sigaction(sig, &act, &oact) < 0) {
	/* And voila -- we just tricked the kernel into giving us our
	* restorer function! */
	} else {
	restore_rt = oact.sa_restorer;
	ret_code = 0;
	}

	return ret_code;
	}

	#endif /* __x86_64__ */

	#ifdef __sparc__
	# if defined __arch64__ \|\| defined __sparcv9

	/*
	* Based on glibc/sysdeps/unix/sysv/linux/sparc/sparc64/sigaction.c
	*/

	extern char *__rt_sig_stub;

	static void __attribute__((used)) __rt_sigreturn_stub(void)
	{
	__asm__ ("__rt_sig_stub: mov %0, %%g1\n\t"
	"ta 0x6d\n\t"
	: /* no outputs */
	: "i" (__NR_rt_sigreturn));
	}

	# else /* sparc32 */

	/*
	* Based on glibc/sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c
	*/

	extern char __rt_sig_stub, __sig_stub;

	static void __attribute__((used)) __rt_sigreturn_stub(void)
	{
	__asm__ ("__rt_sig_stub: mov %0, %%g1\n\t"
	"ta 0x10\n\t"
	: /* no outputs */
	: "i" (__NR_rt_sigreturn));
	}

	static void __attribute__((used)) __sigreturn_stub(void)
	{
	__asm__ ("__sig_stub: mov %0, %%g1\n\t"
	"ta 0x10\n\t"
	: /* no outputs */
	: "i" (__NR_sigreturn));
	}

	# endif
	#endif /* __sparc__ */

	#ifdef __arc__

	#undef SA_RESTORER
	#define SA_RESTORER 0x04000000

	/*
	* based on uClibc/libc/sysdeps/linux/arc/sigaction.c
	*/
	static void
	__attribute__ ((optimize("Os"))) __attribute__((used)) restore_rt(void)
	{
	__asm__ (
	"mov r8, %0 \n\t"
	#ifdef __ARCHS__
	"trap_s 0 \n\t"
	#else
	"trap0 \n\t"
	#endif
	: /* no outputs */
	: "i" (__NR_rt_sigreturn)
	: "r8");
	}
	#endif

	/* This is a wrapper for __NR_rt_sigaction syscall.
	* act/oact values of INVAL_SA_PTR is used to pass
	* an invalid pointer to syscall(__NR_rt_sigaction)
	*
	* Based on glibc/sysdeps/unix/sysv/linux/{...}/sigaction.c
	*/

	static int ltp_rt_sigaction(int signum, const struct sigaction *act,
	struct sigaction *oact, size_t sigsetsize)
	{
	int ret;
	struct kernel_sigaction kact, koact;
	struct kernel_sigaction *kact_p = NULL;
	struct kernel_sigaction *koact_p = NULL;

	if (act == INVAL_SA_PTR) {
	kact_p = INVAL_SA_PTR;
	} else if (act) {
	kact.k_sa_handler = act->sa_handler;
	memcpy(&kact.sa_mask, &act->sa_mask, sizeof(sigset_t));
	kact.sa_flags = act->sa_flags;
	#ifndef __mips__
	kact.sa_restorer = NULL;
	#endif
	kact_p = &kact;
	}

	if (oact == INVAL_SA_PTR)
	koact_p = INVAL_SA_PTR;
	else if (oact)
	koact_p = &koact;

	#ifdef __x86_64__
	sig_initial(signum);
	#endif

	#if defined __x86_64__ \|\| defined __arc__
	kact.sa_flags \|= SA_RESTORER;
	kact.sa_restorer = restore_rt;
	#endif

	#ifdef __sparc__
	unsigned long stub = 0;
	# if defined __arch64__ \|\| defined __sparcv9
	stub = ((unsigned long) &__rt_sig_stub) - 8;
	# else /* sparc32 */
	if ((kact.sa_flags & SA_SIGINFO) != 0)
	stub = ((unsigned long) &__rt_sig_stub) - 8;
	else
	stub = ((unsigned long) &__sig_stub) - 8;
	# endif
	#endif


	#ifdef __sparc__
	ret = ltp_syscall(__NR_rt_sigaction, signum,
	kact_p, koact_p,
	stub, sigsetsize);
	#else
	ret = ltp_syscall(__NR_rt_sigaction, signum,
	kact_p, koact_p,
	sigsetsize);
	#endif

	if (ret >= 0) {
	if (oact && (oact != INVAL_SA_PTR)) {
	oact->sa_handler = koact.k_sa_handler;
	memcpy(&oact->sa_mask, &koact.sa_mask,
	sizeof(sigset_t));
	oact->sa_flags = koact.sa_flags;
	#ifdef HAVE_SA_RESTORER
	oact->sa_restorer = koact.sa_restorer;
	#endif
	}
	}

	return ret;
	}

	#endif /* LTP_RT_SIGACTION_H */