/*
* 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: Garrett Cooper <yanegomi@gmail.com>
*
*/
#ifndef LTP_RT_SIGACTION_H
#define LTP_RT_SIGACTION_H
#include "ltp_signal.h"
#define INVAL_SA_PTR ((void *)-1)
struct kernel_sigaction {
__sighandler_t k_sa_handler;
unsigned long sa_flags;
void (*sa_restorer) (void);
sigset_t sa_mask;
};
/* This macro marks if (struct sigaction) has .sa_restorer member */
#if !defined(__ia64__) && !defined(__alpha__) && !defined(__hppa__)
# 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;
kact.sa_restorer = NULL;
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 */