mips64 patch from Atsushi Nemoto:

It seems these codes dropped when importing from glibc.
This is required for mips64.

diff --git a/libc/sysdeps/linux/mips/sigaction.c b/libc/sysdeps/linux/mips/sigaction.c
index e1eca78..f4b5167 100644 (file)
--- a/libc/sysdeps/linux/mips/sigaction.c
+++ b/libc/sysdeps/linux/mips/sigaction.c
@@ -33,6 +33,16 @@ extern __typeof(sigaction) __libc_sigaction;
 
 libc_hidden_proto(memcpy)
 
+#if _MIPS_SIM != _ABIO32
+
+# ifdef __NR_rt_sigreturn
+static void restore_rt (void) asm ("__restore_rt");
+# endif
+# ifdef __NR_sigreturn
+static void restore (void) asm ("__restore");
+# endif
+#endif
+
 /* 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)
@@ -119,3 +129,31 @@ libc_hidden_proto(sigaction)
 weak_alias(__libc_sigaction,sigaction)
 libc_hidden_weak(sigaction)
 #endif
+
+/* 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                                            \
+  (                                            \
+   ".align 4\n"                                        \
+   "__" #name ":\n"                            \
+   "   li $2, " #syscall "\n"                  \
+   "   syscall\n"                              \
+   );
+
+/* The return code for realtime-signals.  */
+#if _MIPS_SIM != _ABIO32
+# ifdef __NR_rt_sigreturn
+RESTORE (restore_rt, __NR_rt_sigreturn)
+# endif
+# ifdef __NR_sigreturn
+RESTORE (restore, __NR_sigreturn)
+# endif
+#endif