diff options
Diffstat (limited to 'newlib/libc/sys/linux/machine')
| -rw-r--r-- | newlib/libc/sys/linux/machine/i386/Makefile.am | 2 | ||||
| -rw-r--r-- | newlib/libc/sys/linux/machine/i386/Makefile.in | 7 | ||||
| -rw-r--r-- | newlib/libc/sys/linux/machine/i386/sigaction.c | 114 |
3 files changed, 119 insertions, 4 deletions
diff --git a/newlib/libc/sys/linux/machine/i386/Makefile.am b/newlib/libc/sys/linux/machine/i386/Makefile.am index a3ceef50a..dbf819cca 100644 --- a/newlib/libc/sys/linux/machine/i386/Makefile.am +++ b/newlib/libc/sys/linux/machine/i386/Makefile.am @@ -4,7 +4,7 @@ AUTOMAKE_OPTIONS = cygnus INCLUDES = $(NEWLIB_CFLAGS) $(CROSS_CFLAGS) $(TARGET_CFLAGS) -LIB_SOURCES = setjmp.S sigset.c +LIB_SOURCES = setjmp.S sigaction.c sigset.c liblinuxi386_la_LDFLAGS = -Xcompiler -nostdlib diff --git a/newlib/libc/sys/linux/machine/i386/Makefile.in b/newlib/libc/sys/linux/machine/i386/Makefile.in index a167b9b63..cfbb3ccf6 100644 --- a/newlib/libc/sys/linux/machine/i386/Makefile.in +++ b/newlib/libc/sys/linux/machine/i386/Makefile.in @@ -92,7 +92,7 @@ AUTOMAKE_OPTIONS = cygnus INCLUDES = $(NEWLIB_CFLAGS) $(CROSS_CFLAGS) $(TARGET_CFLAGS) -LIB_SOURCES = setjmp.S sigset.c +LIB_SOURCES = setjmp.S sigaction.c sigset.c liblinuxi386_la_LDFLAGS = -Xcompiler -nostdlib @@ -116,11 +116,12 @@ DEFS = @DEFS@ -I. -I$(srcdir) CPPFLAGS = @CPPFLAGS@ LIBS = @LIBS@ lib_a_LIBADD = -@USE_LIBTOOL_FALSE@lib_a_OBJECTS = setjmp.o sigset.o +@USE_LIBTOOL_FALSE@lib_a_OBJECTS = setjmp.o sigaction.o sigset.o LTLIBRARIES = $(noinst_LTLIBRARIES) liblinuxi386_la_LIBADD = -@USE_LIBTOOL_TRUE@liblinuxi386_la_OBJECTS = setjmp.lo sigset.lo +@USE_LIBTOOL_TRUE@liblinuxi386_la_OBJECTS = setjmp.lo sigaction.lo \ +@USE_LIBTOOL_TRUE@sigset.lo CFLAGS = @CFLAGS@ COMPILE = $(CC) $(DEFS) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) LTCOMPILE = $(LIBTOOL) --mode=compile $(CC) $(DEFS) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) diff --git a/newlib/libc/sys/linux/machine/i386/sigaction.c b/newlib/libc/sys/linux/machine/i386/sigaction.c new file mode 100644 index 000000000..6edcb0ae7 --- /dev/null +++ b/newlib/libc/sys/linux/machine/i386/sigaction.c @@ -0,0 +1,114 @@ +/* POSIX.1 `sigaction' call for Linux/i386. + Copyright (C) 1991, 95, 96, 97, 98, 99, 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 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 <errno.h> +#include <stddef.h> +#include <signal.h> +#include <string.h> + +#include <machine/syscall.h> + +/* The difference here is that the sigaction structure used in the + kernel is not the same as we use in the libc. Therefore we must + translate it here. */ +#include <kernel_sigaction.h> + +/* We do not globally define the SA_RESTORER flag so do it here. */ +#define SA_RESTORER 0x04000000 + +#define __NR___rt_sigaction __NR_rt_sigaction + +static _syscall4(int,__rt_sigaction,int,sig,const struct kernel_sigaction *,act, + struct kernel_sigaction *,oact,size_t,size) + +static void restore_rt (void) asm ("__restore_rt"); +static void restore (void) asm ("__restore"); + +/* 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 (sigset_t)); + kact.sa_flags = act->sa_flags | SA_RESTORER; + + kact.sa_restorer = ((act->sa_flags & SA_SIGINFO) + ? &restore_rt : &restore); + } + + /* 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 ? (&kact) : NULL, + oact ? (&koact) : NULL, _NSIG / 8); + + if (oact && result >= 0) + { + oact->sa_handler = koact.k_sa_handler; + memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t)); + oact->sa_flags = koact.sa_flags; + oact->sa_restorer = koact.sa_restorer; + } + return result; +} + +weak_alias (__libc_sigaction, __sigaction) +weak_alias (__libc_sigaction, sigaction) + +/* NOTE: Please think twice before making any changes to the bits of + code below. GDB needs some intimate knowledge about it to + recognize them as signal trampolines, and make backtraces through + signal handlers work right. Important are both the names + (__restore and __restore_rt) and the exact instruction sequence. + If you ever feel the need to make any changes, please notify the + appropriate GDB maintainer. */ + +#define RESTORE(name, syscall) RESTORE2 (name, syscall) +#define RESTORE2(name, syscall) \ +asm \ + ( \ + ".text\n" \ + " .align 16\n" \ + "__" #name ":\n" \ + " movl $" #syscall ", %eax\n" \ + " int $0x80" \ + ); + +/* The return code for realtime-signals. */ +RESTORE (restore_rt, __NR_rt_sigreturn) + +/* For the boring old signals. */ +# undef RESTORE2 +# define RESTORE2(name, syscall) \ +asm \ + ( \ + ".text\n" \ + " .align 8\n" \ + "__" #name ":\n" \ + " popl %eax\n" \ + " movl $" #syscall ", %eax\n" \ + " int $0x80" \ + ); + +RESTORE (restore, __NR_sigreturn) |