*** empty log message ***

[deliverable/binutils-gdb.git] / gdb / i386obsd-tdep.c

diff --git a/gdb/i386obsd-tdep.c b/gdb/i386obsd-tdep.c
index ab382697f8ae1454bbef579b7274ce1e476cc832..38058bfeaafd6f0681d4407b5fec6b69a5a69daf 100644 (file)
--- a/gdb/i386obsd-tdep.c
+++ b/gdb/i386obsd-tdep.c
@@ -1,8 +1,7 @@
 /* Target-dependent code for OpenBSD/i386.
 
-   Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002,
-   2003, 2004, 2005
-   Free Software Foundation, Inc.
+   Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002, 2003,
+   2004, 2005, 2006, 2007 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -345,6 +344,7 @@ i386obsd_trapframe_cache(struct frame_info *next_frame, void **this_cache)
   struct trad_frame_cache *cache;
   CORE_ADDR func, sp, addr;
   ULONGEST cs;
+  char *name;
   int i;
 
   if (*this_cache)
@@ -353,18 +353,27 @@ i386obsd_trapframe_cache(struct frame_info *next_frame, void **this_cache)
   cache = trad_frame_cache_zalloc (next_frame);
   *this_cache = cache;
 
-  func = frame_func_unwind (next_frame);
+  /* NORMAL_FRAME matches the type in i386obsd_trapframe_unwind, but
+     SIGTRAMP_FRAME might be more appropriate.  */
+  func = frame_func_unwind (next_frame, NORMAL_FRAME);
   sp = frame_unwind_register_unsigned (next_frame, I386_ESP_REGNUM);
+
+  find_pc_partial_function (func, &name, NULL, NULL);
+  if (name && strncmp (name, "Xintr", 5) == 0)
+    addr = sp + 8;             /* It's an interrupt frame.  */
+  else
+    addr = sp;
+
   for (i = 0; i < ARRAY_SIZE (i386obsd_tf_reg_offset); i++)
     if (i386obsd_tf_reg_offset[i] != -1)
-      trad_frame_set_reg_addr (cache, i, sp + i386obsd_tf_reg_offset[i]);
+      trad_frame_set_reg_addr (cache, i, addr + i386obsd_tf_reg_offset[i]);
 
   /* Read %cs from trap frame.  */
-  addr = sp + i386obsd_tf_reg_offset[I386_CS_REGNUM];
+  addr += i386obsd_tf_reg_offset[I386_CS_REGNUM];
   cs = read_memory_unsigned_integer (addr, 4); 
   if ((cs & I386_SEL_RPL) == I386_SEL_UPL)
     {
-      /* Trap from use space; terminate backtrace.  */
+      /* Trap from user space; terminate backtrace.  */
       trad_frame_set_id (cache, null_frame_id);
     }
   else
@@ -400,32 +409,37 @@ i386obsd_trapframe_prev_register (struct frame_info *next_frame,
                           optimizedp, lvalp, addrp, realnump, valuep);
 }
 
-static const struct frame_unwind i386obsd_trapframe_unwind = {
-  /* FIXME: kettenis/20051219: This really is more like an interrupt
-     frame, but SIGTRAMP_FRAME would print <signal handler called>,
-     which really is not what we want here.  */
-  NORMAL_FRAME,
-  i386obsd_trapframe_this_id,
-  i386obsd_trapframe_prev_register
-};
-
-static const struct frame_unwind *
-i386obsd_trapframe_sniffer (struct frame_info *next_frame)
+static int
+i386obsd_trapframe_sniffer (const struct frame_unwind *self,
+                           struct frame_info *next_frame,
+                           void **this_prologue_cache)
 {
   ULONGEST cs;
   char *name;
 
+  /* Check Current Privilege Level and bail out if we're not executing
+     in kernel space.  */
   cs = frame_unwind_register_unsigned (next_frame, I386_CS_REGNUM);
   if ((cs & I386_SEL_RPL) == I386_SEL_UPL)
-    return NULL;
+    return 0;
 
   find_pc_partial_function (frame_pc_unwind (next_frame), &name, NULL, NULL);
-  if (name && ((strcmp ("calltrap", name) == 0)
-              || (strcmp ("syscall1", name) == 0)))
-    return &i386obsd_trapframe_unwind;
-
-  return NULL;
+  return (name && (strcmp (name, "calltrap") == 0
+                  || strcmp (name, "syscall1") == 0
+                  || strncmp (name, "Xintr", 5) == 0
+                  || strncmp (name, "Xsoft", 5) == 0));
 }
+
+static const struct frame_unwind i386obsd_trapframe_unwind = {
+  /* FIXME: kettenis/20051219: This really is more like an interrupt
+     frame, but SIGTRAMP_FRAME would print <signal handler called>,
+     which really is not what we want here.  */
+  NORMAL_FRAME,
+  i386obsd_trapframe_this_id,
+  i386obsd_trapframe_prev_register,
+  NULL,
+  i386obsd_trapframe_sniffer
+};
 \f
 
 static void 
@@ -459,7 +473,7 @@ i386obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   bsd_uthread_set_collect_uthread (gdbarch, i386obsd_collect_uthread);
 
   /* Unwind kernel trap frames correctly.  */
-  frame_unwind_append_sniffer (gdbarch, i386obsd_trapframe_sniffer);
+  frame_unwind_prepend_unwinder (gdbarch, &i386obsd_trapframe_unwind);
 }
 
 /* OpenBSD a.out.  */