1 files changed, 123 insertions, 0 deletions
diff --git a/src/third_party/unwind/dist/src/ptrace/_UPT_access_mem.c b/src/third_party/unwind/dist/src/ptrace/_UPT_access_mem.c
new file mode 100644
index 00000000000..79bde25dffc
--- /dev/null
+++ b/src/third_party/unwind/dist/src/ptrace/_UPT_access_mem.c
@@ -0,0 +1,123 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2003-2004 Hewlett-Packard Co
+        Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
+   Copyright (C) 2010 Konstantin Belousov <kib@freebsd.org>
+
+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 "_UPT_internal.h"
+
+#if HAVE_DECL_PTRACE_POKEDATA || HAVE_TTRACE
+int
+_UPT_access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val,
+                 int write, void *arg)
+{
+  struct UPT_info *ui = arg;
+  int    i, end;
+  unw_word_t tmp_val;
+
+  if (!ui)
+        return -UNW_EINVAL;
+
+  pid_t pid = ui->pid;
+
+  // Some 32-bit archs have to define a 64-bit unw_word_t.
+  // Callers of this function therefore expect a 64-bit
+  // return value, but ptrace only returns a 32-bit value
+  // in such cases.
+  if (sizeof(long) == 4 && sizeof(unw_word_t) == 8)
+    end = 2;
+  else
+    end = 1;
+
+  for (i = 0; i < end; i++)
+    {
+      unw_word_t tmp_addr = i == 0 ? addr : addr + 4;
+
+      errno = 0;
+      if (write)
+        {
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+          tmp_val = i == 0 ? *val : *val >> 32;
+#else
+          tmp_val = i == 0 && end == 2 ? *val >> 32 : *val;
+#endif
+
+          Debug (16, "mem[%lx] <- %lx\n", (long) tmp_addr, (long) tmp_val);
+#ifdef HAVE_TTRACE
+#         warning No support for ttrace() yet.
+#else
+          ptrace (PTRACE_POKEDATA, pid, tmp_addr, tmp_val);
+          if (errno)
+            return -UNW_EINVAL;
+#endif
+        }
+      else
+        {
+#ifdef HAVE_TTRACE
+#         warning No support for ttrace() yet.
+#else
+          tmp_val = (unsigned long) ptrace (PTRACE_PEEKDATA, pid, tmp_addr, 0);
+
+          if (i == 0)
+              *val = 0;
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+          *val |= tmp_val << (i * 32);
+#else
+          *val |= i == 0 && end == 2 ? tmp_val << 32 : tmp_val;
+#endif
+
+          if (errno)
+            return -UNW_EINVAL;
+#endif
+          Debug (16, "mem[%lx] -> %lx\n", (long) tmp_addr, (long) tmp_val);
+        }
+    }
+  return 0;
+}
+#elif HAVE_DECL_PT_IO
+int
+_UPT_access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val,
+                 int write, void *arg)
+{
+  struct UPT_info *ui = arg;
+  if (!ui)
+        return -UNW_EINVAL;
+  pid_t pid = ui->pid;
+  struct ptrace_io_desc iod;
+
+  iod.piod_offs = (void *)addr;
+  iod.piod_addr = val;
+  iod.piod_len = sizeof(*val);
+  iod.piod_op = write ? PIOD_WRITE_D : PIOD_READ_D;
+  if (write)
+    Debug (16, "mem[%lx] <- %lx\n", (long) addr, (long) *val);
+  if (ptrace(PT_IO, pid, (caddr_t)&iod, 0) == -1)
+    return -UNW_EINVAL;
+  if (!write)
+     Debug (16, "mem[%lx] -> %lx\n", (long) addr, (long) *val);
+  return 0;
+}
+#else
+#error Fix me
+#endif