diff options
Diffstat (limited to 'libc/sysdeps')
| -rw-r--r-- | libc/sysdeps/linux/arm/Makefile | 5 | ||||
| -rw-r--r-- | libc/sysdeps/linux/arm/sigaction.c | 116 | ||||
| -rw-r--r-- | libc/sysdeps/linux/arm/sigrestorer.S | 40 |
3 files changed, 159 insertions, 2 deletions
diff --git a/libc/sysdeps/linux/arm/Makefile b/libc/sysdeps/linux/arm/Makefile index 8cd0efa47..540d2b30c 100644 --- a/libc/sysdeps/linux/arm/Makefile +++ b/libc/sysdeps/linux/arm/Makefile @@ -28,10 +28,11 @@ ASFLAGS=$(CFLAGS) CRT0_SRC = crt0.S CRT0_OBJ = crt0.o crt1.o -SSRC=__longjmp.S vfork.S clone.S setjmp.S bsd-setjmp.S bsd-_setjmp.S +SSRC=__longjmp.S vfork.S clone.S setjmp.S bsd-setjmp.S \ + bsd-_setjmp.S sigrestorer.S SOBJS=$(patsubst %.S,%.o, $(SSRC)) -CSRC=brk.c syscall.c ioperm.c +CSRC=brk.c syscall.c ioperm.c sigaction.c COBJS=$(patsubst %.c,%.o, $(CSRC)) OBJS=$(SOBJS) $(MOBJ) $(COBJS) diff --git a/libc/sysdeps/linux/arm/sigaction.c b/libc/sysdeps/linux/arm/sigaction.c new file mode 100644 index 000000000..5efd7f2a8 --- /dev/null +++ b/libc/sysdeps/linux/arm/sigaction.c @@ -0,0 +1,116 @@ +/* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. + + Totally hacked up for uClibc by Erik Andersen <andersen@codepoet.org> + */ + +#include <errno.h> +#include <signal.h> +#include <string.h> +#include <sys/syscall.h> +#include <bits/kernel_sigaction.h> + +#define SA_RESTORER 0x04000000 +extern void __default_sa_restorer(void); +extern void __default_rt_sa_restorer(void); + +#if defined __NR_rt_sigaction + +/* If ACT is not NULL, change the action for SIG to *ACT. + If OACT is not NULL, put the old action for SIG in *OACT. */ +int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact) +{ + int result; + struct kernel_sigaction kact, koact; + + if (act) { + kact.k_sa_handler = act->sa_handler; + memcpy (&kact.sa_mask, &act->sa_mask, sizeof (kact.sa_mask)); + kact.sa_flags = act->sa_flags; +# ifdef HAVE_SA_RESTORER + if (kact.sa_flags & (SA_RESTORER | SA_ONSTACK)) { + kact.sa_restorer = act->sa_restorer; + } else { + if (kact.sa_flags & SA_SIGINFO) { + kact.sa_restorer = __default_rt_sa_restorer; + } else { + kact.sa_restorer = __default_sa_restorer; + kact.sa_flags |= SA_RESTORER; + } + } +# endif + } + + /* XXX The size argument hopefully will have to be changed to the + real size of the user-level sigset_t. */ + result = __rt_sigaction(sig, act ? __ptrvalue (&kact) : NULL, + oact ? __ptrvalue (&koact) : NULL, _NSIG / 8); + + if (oact && result >= 0) { + oact->sa_handler = koact.k_sa_handler; + memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (oact->sa_mask)); + oact->sa_flags = koact.sa_flags; +# ifdef HAVE_SA_RESTORER + oact->sa_restorer = koact.sa_restorer; +# endif + } + return result; +} + + +#else + +/* If ACT is not NULL, change the action for SIG to *ACT. + If OACT is not NULL, put the old action for SIG in *OACT. */ +int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact) +{ + int result; + struct old_kernel_sigaction kact, koact; + + if (act) { + kact.k_sa_handler = act->sa_handler; + kact.sa_mask = act->sa_mask.__val[0]; + kact.sa_flags = act->sa_flags; +# ifdef HAVE_SA_RESTORER + /* See the comments above for why we test SA_ONSTACK. */ + if (kact.sa_flags & (SA_RESTORER | SA_ONSTACK)) { + kact.sa_restorer = act->sa_restorer; + } else { + kact.sa_restorer = __default_sa_restorer; + kact.sa_flags |= SA_RESTORER; + } +# endif + } + result = __sigaction(sig, act ? __ptrvalue (&kact) : NULL, + oact ? __ptrvalue (&koact) : NULL); + + if (oact && result >= 0) { + oact->sa_handler = koact.k_sa_handler; + oact->sa_mask.__val[0] = koact.sa_mask; + oact->sa_flags = koact.sa_flags; +# ifdef HAVE_SA_RESTORER + oact->sa_restorer = koact.sa_restorer; +# endif + } + return result; +} + +#endif + +weak_alias(__libc_sigaction, sigaction) + diff --git a/libc/sysdeps/linux/arm/sigrestorer.S b/libc/sysdeps/linux/arm/sigrestorer.S new file mode 100644 index 000000000..a90881eb0 --- /dev/null +++ b/libc/sysdeps/linux/arm/sigrestorer.S @@ -0,0 +1,40 @@ +/* Copyright (C) 1999 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sys/syscall.h> + +/* If no SA_RESTORER function was specified by the application we use + one of these. This avoids the need for the kernel to synthesise a return + instruction on the stack, which would involve expensive cache flushes. */ + +.globl __default_sa_restorer; +.type __default_sa_restorer,%function +.align 4; +__default_sa_restorer: + swi __NR_sigreturn + + +#ifdef __NR_rt_sigreturn + +.globl __default_rt_sa_restorer; +.type __default_rt_sa_restorer,%function +.align 4; +__default_rt_sa_restorer: + swi __NR_rt_sigreturn + +#endif |