1 files changed, 61 insertions, 0 deletions
diff --git a/gcc-4.9/libgcc/config/nios2/tramp.c b/gcc-4.9/libgcc/config/nios2/tramp.c
new file mode 100644
index 000000000..78661e237
--- /dev/null
+++ b/gcc-4.9/libgcc/config/nios2/tramp.c
@@ -0,0 +1,61 @@
+/* Copyright (C) 2013-2014 Free Software Foundation, Inc.
+   Contributed by Altera and Mentor Graphics, Inc.
+
+This file is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 3, or (at your option) any
+later version.
+
+This file 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
+General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/* Set up trampolines.
+   R12 is the static chain register.
+   R2 is AT, the assembler temporary.
+   The trampoline code looks like:
+	movhi	r12,%hi(chain)
+	ori	r12,%lo(chain)
+	movhi	r2,%hi(fn)
+	ori	r2,%lo(fn)
+	jmp	r2
+*/
+
+#define SC_REGNO 12
+
+#define MOVHI(reg,imm16) \
+  (((reg) << 22) | ((imm16) << 6) | 0x34)
+#define ORI(reg,imm16) \
+  (((reg) << 27) | ((reg) << 22) | ((imm16) << 6) | 0x14)
+#define JMP(reg) \
+  (((reg) << 27) | (0x0d << 11) | 0x3a)
+
+void
+__trampoline_setup (unsigned int *addr, void *fnptr, void *chainptr)
+{
+  unsigned int fn = (unsigned int) fnptr;
+  unsigned int chain = (unsigned int) chainptr;
+  int i;
+
+  addr[0] = MOVHI (SC_REGNO, ((chain >> 16) & 0xffff));
+  addr[1] = ORI (SC_REGNO, (chain & 0xffff));
+  addr[2] = MOVHI (2, ((fn >> 16) & 0xffff));
+  addr[3] = ORI (2, (fn & 0xffff));
+  addr[4] = JMP (2);
+
+  /* Flush the caches.
+     See Example 9-4 in the Nios II Software Developer's Handbook.  */
+  for (i = 0; i < 5; i++)
+    asm volatile ("flushd 0(%0); flushi %0" :: "r"(addr + i) : "memory");
+  asm volatile ("flushp" ::: "memory");
+}