1 files changed, 84 insertions, 0 deletions
diff --git a/gdb/i386bsd-tdep.c b/gdb/i386bsd-tdep.c
new file mode 100644
index 0000000..a01ed6b
--- /dev/null
+++ b/gdb/i386bsd-tdep.c
@@ -0,0 +1,84 @@
+/* Target-dependent code for i386 BSD's.
+   Copyright 2001 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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 of the License, 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., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "frame.h"
+#include "gdbcore.h"
+#include "regcache.h"
+
+/* Support for signal handlers.  */
+
+/* Range in which to find the signaltramp routine, traditionally found
+   on the use stack, just below the user area.  Initialized to values
+   that work for NetBSD and FreeBSD.  */
+
+CORE_ADDR i386bsd_sigtramp_start = 0xbfbfdf20;
+CORE_ADDR i386bsd_sigtramp_end = 0xbfbfdff0;
+
+/* Return whether PC is in a BSD sigtramp routine.  */
+
+int
+i386bsd_in_sigtramp (CORE_ADDR pc, char *name)
+{
+  return (pc >= i386bsd_sigtramp_start && pc < i386bsd_sigtramp_end);
+}
+
+/* Offset in the sigcontext structure of the program counter.
+   Initialized to the value from 4.4 BSD Lite.  */
+int i386bsd_sigcontext_pc_offset = 20;
+
+/* Assuming FRAME is for a BSD sigtramp routine, return the address of
+   the associated sigcontext structure.  */
+
+static CORE_ADDR
+i386bsd_sigcontext_addr (struct frame_info *frame)
+{
+  if (frame->next)
+    /* If this isn't the top frame, the next frame must be for the
+       signal handler itself.  A pointer to the sigcontext structure
+       is passed as the third argument to the signal handler.  */
+    return read_memory_unsigned_integer (frame->next->frame + 16, 4);
+
+  /* This is the top frame.  We'll have to find the address of the
+     sigcontext structure by looking at the stack pointer.  */
+  return read_memory_unsigned_integer (read_register (SP_REGNUM) + 8, 4);
+}
+
+/* Assuming FRAME is for a BSD sigtramp routine, return the saved
+   program counter.  */
+
+static CORE_ADDR
+i386bsd_sigtramp_saved_pc (struct frame_info *frame)
+{
+  CORE_ADDR addr;
+  addr = i386bsd_sigcontext_addr (frame);
+  return read_memory_unsigned_integer (addr + i386bsd_sigcontext_pc_offset, 4);
+}
+
+/* Return the saved program counter for FRAME.  */
+
+CORE_ADDR
+i386bsd_frame_saved_pc (struct frame_info *frame)
+{
+  if (frame->signal_handler_caller)
+    return i386bsd_sigtramp_saved_pc (frame);
+
+  return read_memory_unsigned_integer (frame->frame + 4, 4);
+}