1 files changed, 59 insertions, 0 deletions
diff --git a/libc/ports/sysdeps/microblaze/backtrace_linux.c b/libc/ports/sysdeps/microblaze/backtrace_linux.c
new file mode 100644
index 000000000..55fa061dc
--- /dev/null
+++ b/libc/ports/sysdeps/microblaze/backtrace_linux.c
@@ -0,0 +1,59 @@
+/* Copyright (C) 2005-2013 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stddef.h>
+#include <asm/sigcontext.h>
+#include <linux/signal.h>
+#include <asm-generic/ucontext.h>
+#include <asm/unistd.h>
+
+int
+_identify_sighandler (unsigned long fp, unsigned long pc,
+                      unsigned long *pprev_fp, unsigned long *pprev_pc,
+                      unsigned long *retaddr)
+{
+  unsigned long *tramp = 0;
+  struct ucontext *uc;
+
+  if (*retaddr == 0)
+    {
+      /* Kernel inserts the tramp between the signal handler frame and the
+         caller frame in signal handling.  */
+      tramp = (unsigned long *) pc;
+      tramp += 2;
+      if ((*tramp == (0x31800000 | __NR_rt_sigreturn))
+          && (*(tramp+1) == 0xb9cc0008))
+        {
+          /* Signal handler function argument are:
+             int sig_num, siginfo_t * info, void * ucontext
+             therefore ucontext is the 3rd argument.  */
+          unsigned long ucptr = ((unsigned long) tramp
+                                 - sizeof (struct ucontext));
+          uc = (struct ucontext *) ucptr;
+          *pprev_pc = uc->uc_mcontext.regs.pc;
+          /* Need to record the return address since the return address of the
+             function which causes this signal may not be recorded in the
+             stack.  */
+          *pprev_fp = uc->uc_mcontext.regs.r1;
+          *retaddr = uc->uc_mcontext.regs.r15;
+          /* It is a signal handler.  */
+          return 1;
+        }
+    }
+  return 0;
+}