summaryrefslogtreecommitdiff
path: root/libc/sysdeps/linux/i386
diff options
context:
space:
mode:
Diffstat (limited to 'libc/sysdeps/linux/i386')
-rw-r--r--libc/sysdeps/linux/i386/Makefile2
-rw-r--r--libc/sysdeps/linux/i386/sigaction.c169
2 files changed, 170 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/i386/Makefile b/libc/sysdeps/linux/i386/Makefile
index 77c8c815d..dbbe7db11 100644
--- a/libc/sysdeps/linux/i386/Makefile
+++ b/libc/sysdeps/linux/i386/Makefile
@@ -32,7 +32,7 @@ SSRC=__longjmp.S vfork.S clone.S setjmp.S bsd-setjmp.S \
bsd-_setjmp.S syscall.S
SOBJS=$(patsubst %.S,%.o, $(SSRC))
-CSRC=brk.c
+CSRC=brk.c sigaction.c
COBJS=$(patsubst %.c,%.o, $(CSRC))
OBJS=$(SOBJS) $(COBJS)
diff --git a/libc/sysdeps/linux/i386/sigaction.c b/libc/sysdeps/linux/i386/sigaction.c
new file mode 100644
index 000000000..c05950793
--- /dev/null
+++ b/libc/sysdeps/linux/i386/sigaction.c
@@ -0,0 +1,169 @@
+/* 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
+
+
+#if defined __NR_rt_sigaction
+#warning "Yes there are two warnings here. Don't worry about it."
+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;
+
+#ifdef SIGCANCEL
+ if (sig == SIGCANCEL) {
+ __set_errno (EINVAL);
+ return -1;
+ }
+#endif
+
+ 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;
+
+ 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 = __syscall_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;
+ oact->sa_restorer = koact.sa_restorer;
+ }
+ return result;
+}
+
+
+#else
+#warning "Yes there is a warning here. Don't worry about it."
+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 old_kernel_sigaction kact, koact;
+
+#ifdef SIGCANCEL
+ if (sig == SIGCANCEL) {
+ __set_errno (EINVAL);
+ return -1;
+ }
+#endif
+
+ if (act) {
+ kact.k_sa_handler = act->sa_handler;
+ kact.sa_mask = act->sa_mask.__val[0];
+ kact.sa_flags = act->sa_flags | SA_RESTORER;
+ kact.sa_restorer = &restore;
+ }
+ result = __syscall_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
+ oact ? __ptrvalue (&koact) : NULL);
+
+ asm volatile ("pushl %%ebx\n"
+ "movl %2, %%ebx\n"
+ "int $0x80\n"
+ "popl %%ebx"
+ : "=a" (result)
+ : "0" (SYS_ify (sigaction)), "mr" (sig),
+ "c" (act ? __ptrvalue (&kact) : 0),
+ "d" (oact ? __ptrvalue (&koact) : 0));
+
+ if (result < 0) {
+ __set_errno(-result);
+ return -1;
+ }
+
+ if (oact) {
+ oact->sa_handler = koact.k_sa_handler;
+ oact->sa_mask.__val[0] = koact.sa_mask;
+ oact->sa_flags = koact.sa_flags;
+ oact->sa_restorer = koact.sa_restorer;
+ }
+ return result;
+}
+
+#endif
+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" \
+ );
+
+#ifdef __NR_rt_sigaction
+/* The return code for realtime-signals. */
+RESTORE (restore_rt, __NR_rt_sigreturn)
+#endif
+
+/* 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)
+