some source files for x86_64

1 files changed, 135 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/x86_64/sigaction.c b/libc/sysdeps/linux/x86_64/sigaction.c
new file mode 100644
index 000000000..217fd2ae1
--- /dev/null
+++ b/libc/sysdeps/linux/x86_64/sigaction.c
@@ -0,0 +1,135 @@
+/* POSIX.1 `sigaction' call for Linux/x86-64.
+   Copyright (C) 2001, 2002, 2003 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 <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;
+
+	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 = &restore_rt;
+	}
+
+	/* XXX The size argument hopefully will have to be changed to the
+	   real size of the user-level sigset_t.  */
+	result = INLINE_SYSCALL (rt_sigaction, 4,
+	                         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 (sigset_t));
+		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;
+	}
+
+	asm volatile ("syscall\n"
+	              : "=a" (result)
+	              : "0" (__NR_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_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"				\
+   "	movq $" #syscall ", %rax\n"		\
+   "	syscall\n"				\
+   );
+#ifdef __NR_rt_sigaction
+/* The return code for realtime-signals.  */
+RESTORE (restore_rt, __NR_rt_sigreturn)
+#endif
+#ifdef __NR_sigreturn
+RESTORE (restore, __NR_sigreturn)
+#endif