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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Library General Public License as
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+ published by the Free Software Foundation; either version 2 of the
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+ License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Library General Public License for more details.
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+
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+ You should have received a copy of the GNU Library General Public
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+ License along with the GNU C Library; see the file COPYING.LIB. If not,
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+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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+ Boston, MA 02111-1307, USA.
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+
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+ Totally hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
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+ */
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+
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+#include <errno.h>
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+#include <signal.h>
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+#include <string.h>
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+#include <sys/syscall.h>
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+#include <bits/kernel_sigaction.h>
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+
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+#define SA_RESTORER 0x04000000
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+
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+
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+#if defined __NR_rt_sigaction
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+#warning "Yes there are two warnings here. Don't worry about it."
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+static void restore_rt (void) asm ("__restore_rt");
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+static void restore (void) asm ("__restore");
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+
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+
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+ If OACT is not NULL, put the old action for SIG in *OACT. */
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+int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
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+{
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+ int result;
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+ struct kernel_sigaction kact, koact;
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+
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+#ifdef SIGCANCEL
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+ if (sig == SIGCANCEL) {
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+ __set_errno (EINVAL);
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+ return -1;
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+ }
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+#endif
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+
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+ if (act) {
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+ kact.k_sa_handler = act->sa_handler;
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+ memcpy (&kact.sa_mask, &act->sa_mask, sizeof (kact.sa_mask));
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+ kact.sa_flags = act->sa_flags;
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+
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+ kact.sa_flags = act->sa_flags | SA_RESTORER;
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+ kact.sa_restorer = ((act->sa_flags & SA_SIGINFO)
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+ ? &restore_rt : &restore);
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+ }
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+
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+
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+ real size of the user-level sigset_t. */
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+ result = __syscall_rt_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
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+ oact ? __ptrvalue (&koact) : NULL, _NSIG / 8);
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+
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+ if (oact && result >= 0) {
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+ oact->sa_handler = koact.k_sa_handler;
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+ memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (oact->sa_mask));
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+ oact->sa_flags = koact.sa_flags;
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+ oact->sa_restorer = koact.sa_restorer;
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+ }
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+ return result;
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+}
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+
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+
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+#else
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+#warning "Yes there is a warning here. Don't worry about it."
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+static void restore (void) asm ("__restore");
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+
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+
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+ If OACT is not NULL, put the old action for SIG in *OACT. */
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+int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
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+{
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+ int result;
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+ struct old_kernel_sigaction kact, koact;
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+
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+#ifdef SIGCANCEL
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+ if (sig == SIGCANCEL) {
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+ __set_errno (EINVAL);
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+ return -1;
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+ }
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+#endif
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+
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+ if (act) {
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+ kact.k_sa_handler = act->sa_handler;
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+ kact.sa_mask = act->sa_mask.__val[0];
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+ kact.sa_flags = act->sa_flags | SA_RESTORER;
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+ kact.sa_restorer = &restore;
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+ }
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+ result = __syscall_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
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+ oact ? __ptrvalue (&koact) : NULL);
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+
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+ asm volatile ("pushl %%ebx\n"
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+ "movl %2, %%ebx\n"
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+ "int $0x80\n"
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+ "popl %%ebx"
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+ : "=a" (result)
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+ : "0" (SYS_ify (sigaction)), "mr" (sig),
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+ "c" (act ? __ptrvalue (&kact) : 0),
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+ "d" (oact ? __ptrvalue (&koact) : 0));
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+
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+ if (result < 0) {
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+ __set_errno(-result);
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+ return -1;
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+ }
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+
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+ if (oact) {
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+ oact->sa_handler = koact.k_sa_handler;
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+ oact->sa_mask.__val[0] = koact.sa_mask;
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+ oact->sa_flags = koact.sa_flags;
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+ oact->sa_restorer = koact.sa_restorer;
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+ }
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+ return result;
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+}
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+
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+#endif
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+weak_alias (__libc_sigaction, sigaction)
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+
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+
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+
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+
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+
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+ code below. GDB needs some intimate knowledge about it to
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+ recognize them as signal trampolines, and make backtraces through
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+ signal handlers work right. Important are both the names
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+ (__restore and __restore_rt) and the exact instruction sequence.
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+ If you ever feel the need to make any changes, please notify the
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+ appropriate GDB maintainer. */
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+
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+#define RESTORE(name, syscall) RESTORE2 (name, syscall)
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+#define RESTORE2(name, syscall) \
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+asm \
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+ ( \
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+ ".text\n" \
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+ " .align 16\n" \
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+ "__" #name ":\n" \
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+ " movl $" #syscall ", %eax\n" \
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+ " int $0x80" \
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+ );
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+
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+#ifdef __NR_rt_sigaction
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+
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+RESTORE (restore_rt, __NR_rt_sigreturn)
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+#endif
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+
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+
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+# undef RESTORE2
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+# define RESTORE2(name, syscall) \
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+asm \
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+ ( \
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+ ".text\n" \
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+ " .align 8\n" \
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+ "__" #name ":\n" \
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+ " popl %eax\n" \
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+ " movl $" #syscall ", %eax\n" \
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+ " int $0x80" \
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+ );
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+
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+RESTORE (restore, __NR_sigreturn)
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+
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Eric Andersen