1 files changed, 118 insertions, 0 deletions
diff --git a/libsigsegv/src/stackvma-freebsd.c b/libsigsegv/src/stackvma-freebsd.c
new file mode 100644
index 00000000..fd04ba85
--- /dev/null
+++ b/libsigsegv/src/stackvma-freebsd.c
@@ -0,0 +1,118 @@
+/* Determine the virtual memory area of a given address.  FreeBSD version.
+   Copyright (C) 2002-2003, 2006, 2008  Bruno Haible <bruno@clisp.org>
+
+   This program 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 2, or (at your option)
+   any later version.
+
+   This program 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.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include "stackvma.h"
+#include <stdio.h>
+
+#include "stackvma-simple.c"
+#include "stackvma-rofile.c"
+
+#if HAVE_MINCORE
+# define sigsegv_get_vma mincore_get_vma
+# define STATIC static
+# include "stackvma-mincore.c"
+# undef sigsegv_get_vma
+#endif
+
+int
+sigsegv_get_vma (unsigned long address, struct vma_struct *vma)
+{
+  struct rofile rof;
+  int c;
+  /* The stack appears as multiple adjacents segments, therefore we
+     merge adjacent segments.  */
+  unsigned long next_start, next_end, curr_start, curr_end;
+#if STACK_DIRECTION < 0
+  unsigned long prev_end;
+#endif
+
+  /* Open the current process' maps file.  It describes one VMA per line.  */
+  if (rof_open (&rof, "/proc/curproc/map") < 0)
+    goto failed;
+
+#if STACK_DIRECTION < 0
+  prev_end = 0;
+#endif
+  for (curr_start = curr_end = 0; ;)
+    {
+      if (!(rof_getchar (&rof) == '0'
+            && rof_getchar (&rof) == 'x'
+            && rof_scanf_lx (&rof, &next_start) >= 0))
+        break;
+      while (c = rof_peekchar (&rof), c == ' ' || c == '\t')
+        rof_getchar (&rof);
+      if (!(rof_getchar (&rof) == '0'
+            && rof_getchar (&rof) == 'x'
+            && rof_scanf_lx (&rof, &next_end) >= 0))
+        break;
+      while (c = rof_getchar (&rof), c != -1 && c != '\n')
+        continue;
+      if (next_start == curr_end)
+        {
+          /* Merge adjacent segments.  */
+          curr_end = next_end;
+        }
+      else
+        {
+          if (curr_start < curr_end
+              && address >= curr_start && address <= curr_end-1)
+            goto found;
+#if STACK_DIRECTION < 0
+          prev_end = curr_end;
+#endif
+          curr_start = next_start; curr_end = next_end;
+        }
+    }
+  if (address >= curr_start && address <= curr_end-1)
+    found:
+    {
+      vma->start = curr_start;
+      vma->end = curr_end;
+#if STACK_DIRECTION < 0
+      vma->prev_end = prev_end;
+#else
+      if (rof_getchar (&rof) == '0'
+          && rof_getchar (&rof) == 'x'
+          && rof_scanf_lx (&rof, &vma->next_start) >= 0)
+        {
+          while (c = rof_peekchar (&rof), c == ' ' || c == '\t')
+            rof_getchar (&rof);
+          if (rof_getchar (&rof) == '0'
+              && rof_getchar (&rof) == 'x'
+              && rof_scanf_lx (&rof, &next_end) >= 0)
+            ;
+          else
+            vma->next_start = 0;
+        }
+      else
+        vma->next_start = 0;
+#endif
+      rof_close (&rof);
+      vma->is_near_this = simple_is_near_this;
+      return 0;
+    }
+  rof_close (&rof);
+ failed:
+#if HAVE_MINCORE
+  /* FreeBSD 6.[01] doesn't allow to distinguish unmapped pages from
+     mapped but swapped-out pages.  See whether it's fixed.  */
+  if (!is_mapped (0))
+    /* OK, mincore() appears to work as expected.  */
+    return mincore_get_vma (address, vma);
+#endif
+  return -1;
+}