1 files changed, 115 insertions, 0 deletions
diff --git a/src/third_party/unwind/dist/src/tilegx/Gis_signal_frame.c b/src/third_party/unwind/dist/src/tilegx/Gis_signal_frame.c
new file mode 100644
index 00000000000..5452c2cb2aa
--- /dev/null
+++ b/src/third_party/unwind/dist/src/tilegx/Gis_signal_frame.c
@@ -0,0 +1,115 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2008 CodeSourcery
+   Copyright (C) 2014 Tilera Corp.
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+#include "unwind_i.h"
+#include <stdio.h>
+#include "offsets.h"
+
+#ifdef __linux__
+#include <sys/syscall.h>
+#include <arch/abi.h>
+#else
+# error "Only support Linux!"
+#endif
+
+#define  MOVELI_R10_RT_SIGRETURN                         \
+  ( 0x000007e051483000ULL    |                           \
+    ((unsigned long)__NR_rt_sigreturn << 43) |           \
+    ((unsigned long)TREG_SYSCALL_NR << 31) )
+#define  SWINT1      0x286b180051485000ULL
+
+int
+unw_is_signal_frame (unw_cursor_t *cursor)
+{
+  struct cursor *c = (struct cursor*) cursor;
+  unw_word_t w0, w1, ip;
+  unw_addr_space_t as;
+  unw_accessors_t *a;
+  void *arg;
+  int ret;
+
+  as = c->dwarf.as;
+  a = unw_get_accessors_int (as);
+  arg = c->dwarf.as_arg;
+
+  ip = c->dwarf.ip;
+
+  if (!ip || !a->access_mem || (ip & (sizeof(unw_word_t) - 1)))
+    return 0;
+
+  if ((ret = (*a->access_mem) (as, ip, &w0, 0, arg)) < 0)
+    return ret;
+
+  if ((ret = (*a->access_mem) (as, ip + 8, &w1, 0, arg)) < 0)
+    return ret;
+
+  /* Return 1 if the IP points to a RT sigreturn sequence. */
+  if (w0 == MOVELI_R10_RT_SIGRETURN &&
+      w1 ==  SWINT1)
+    {
+      return 1;
+    }
+  return 0;
+}
+
+
+HIDDEN int
+tilegx_handle_signal_frame (unw_cursor_t *cursor)
+{
+  int i;
+  struct cursor *c = (struct cursor *) cursor;
+  unw_word_t sc_addr, sp, sp_addr = c->dwarf.cfa;
+  struct dwarf_loc sp_loc = DWARF_LOC (sp_addr, 0);
+  int ret;
+
+  if ((ret = dwarf_get (&c->dwarf, sp_loc, &sp)) < 0)
+    return -UNW_EUNSPEC;
+
+  /* Save the SP and PC to be able to return execution at this point
+     later in time (unw_resume).  */
+  c->sigcontext_sp = c->dwarf.cfa;
+  c->sigcontext_pc = c->dwarf.ip;
+
+  c->sigcontext_addr = sp_addr + sizeof (siginfo_t) +
+    C_ABI_SAVE_AREA_SIZE;
+  sc_addr = c->sigcontext_addr + LINUX_UC_MCONTEXT_OFF;
+
+  /* Update the dwarf cursor.
+     Set the location of the registers to the corresponding addresses of the
+     uc_mcontext / sigcontext structure contents.  */
+
+#define  SC_REG_OFFSET(X)   (8 * X)
+
+  for (i = UNW_TILEGX_R0; i <= UNW_TILEGX_R55; i++)
+    {
+      c->dwarf.loc[i] = DWARF_LOC (sc_addr + SC_REG_OFFSET(i), 0);
+    }
+
+  /* Set SP/CFA and PC/IP.  */
+  dwarf_get (&c->dwarf, c->dwarf.loc[UNW_TILEGX_R54], &c->dwarf.cfa);
+  dwarf_get (&c->dwarf, c->dwarf.loc[UNW_TILEGX_R55], &c->dwarf.ip);
+
+  return 1;
+}