diff options
Diffstat (limited to 'src/kernel/tests/include/lapi/rt_sigaction.h')
| -rw-r--r-- | src/kernel/tests/include/lapi/rt_sigaction.h | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/src/kernel/tests/include/lapi/rt_sigaction.h b/src/kernel/tests/include/lapi/rt_sigaction.h new file mode 100644 index 0000000..3af9136 --- /dev/null +++ b/src/kernel/tests/include/lapi/rt_sigaction.h @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2009 Cisco Systems, Inc. All Rights Reserved. + * Copyright (c) 2009 FUJITSU LIMITED. All Rights Reserved. + * 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; + void (* k_sa_handler)(int); + sigset_t sa_mask; +}; +#else +struct kernel_sigaction { + void (* k_sa_handler)(int); + 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 + +#ifdef TST_TEST_H__ +# define TST_SYSCALL tst_syscall +#else +# define TST_SYSCALL ltp_syscall +#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 = TST_SYSCALL(__NR_rt_sigaction, signum, + kact_p, koact_p, + stub, sigsetsize); +#else + ret = TST_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 */ |