toolchain/gdb/patches/640-debian_dwarf2-frame-signal-unwinder.patch

   1 Status: Checked in to HEAD after 6.3.
   2
   3 2004-11-07  Daniel Jacobowitz  <dan@debian.org>
   4
   5         * dwarf2-frame.c (struct dwarf2_frame_ops): Add signal_frame_p.
   6         (dwarf2_frame_set_signal_frame_p, dwarf2_frame_signal_frame_p)
   7         (dwarf2_signal_frame_unwind): New.
   8         (dwarf2_frame_sniffer): Use dwarf2_frame_signal_frame_p.
   9         * dwarf2-frame.h (dwarf2_frame_set_signal_frame_p): New prototype.
  10
  11 Index: src/gdb/dwarf2-frame.c
  12 ===================================================================
  13 RCS file: /big/fsf/rsync/src-cvs/src/gdb/dwarf2-frame.c,v
  14 retrieving revision 1.41
  15 diff -u -p -r1.41 dwarf2-frame.c
  16 --- src/gdb/dwarf2-frame.c      4 Nov 2004 21:15:15 -0000       1.41
  17 +++ src/gdb/dwarf2-frame.c      7 Nov 2004 17:41:58 -0000
  18 @@ -471,6 +471,10 @@ struct dwarf2_frame_ops
  19  {
  20    /* Pre-initialize the register state REG for register REGNUM.  */
  21    void (*init_reg) (struct gdbarch *, int, struct dwarf2_frame_state_reg *);
  22 +
  23 +  /* Check whether the frame preceding NEXT_FRAME will be a signal
  24 +     trampoline.  */
  25 +  int (*signal_frame_p) (struct gdbarch *, struct frame_info *);
  26  };
  27
  28  /* Default architecture-specific register state initialization
  29 @@ -547,6 +551,33 @@ dwarf2_frame_init_reg (struct gdbarch *g
  30
  31    ops->init_reg (gdbarch, regnum, reg);
  32  }
  33 +
  34 +/* Set the architecture-specific signal trampoline recognition
  35 +   function for GDBARCH to SIGNAL_FRAME_P.  */
  36 +
  37 +void
  38 +dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch,
  39 +                                int (*signal_frame_p) (struct gdbarch *,
  40 +                                                       struct frame_info *))
  41 +{
  42 +  struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data);
  43 +
  44 +  ops->signal_frame_p = signal_frame_p;
  45 +}
  46 +
  47 +/* Query the architecture-specific signal frame recognizer for
  48 +   NEXT_FRAME.  */
  49 +
  50 +static int
  51 +dwarf2_frame_signal_frame_p (struct gdbarch *gdbarch,
  52 +                            struct frame_info *next_frame)
  53 +{
  54 +  struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data);
  55 +
  56 +  if (ops->signal_frame_p == NULL)
  57 +    return 0;
  58 +  return ops->signal_frame_p (gdbarch, next_frame);
  59 +}
  60  \f
  61
  62  struct dwarf2_frame_cache
  63 @@ -841,6 +872,13 @@ static const struct frame_unwind dwarf2_
  64    dwarf2_frame_prev_register
  65  };
  66
  67 +static const struct frame_unwind dwarf2_signal_frame_unwind =
  68 +{
  69 +  SIGTRAMP_FRAME,
  70 +  dwarf2_frame_this_id,
  71 +  dwarf2_frame_prev_register
  72 +};
  73 +
  74  const struct frame_unwind *
  75  dwarf2_frame_sniffer (struct frame_info *next_frame)
  76  {
  77 @@ -848,10 +886,18 @@ dwarf2_frame_sniffer (struct frame_info
  78       function.  frame_pc_unwind(), for a no-return next function, can
  79       end up returning something past the end of this function's body.  */
  80    CORE_ADDR block_addr = frame_unwind_address_in_block (next_frame);
  81 -  if (dwarf2_frame_find_fde (&block_addr))
  82 -    return &dwarf2_frame_unwind;
  83 +  if (!dwarf2_frame_find_fde (&block_addr))
  84 +    return NULL;
  85
  86 -  return NULL;
  87 +  /* On some targets, signal trampolines may have unwind information.
  88 +     We need to recognize them so that we set the frame type
  89 +     correctly.  */
  90 +
  91 +  if (dwarf2_frame_signal_frame_p (get_frame_arch (next_frame),
  92 +                                  next_frame))
  93 +    return &dwarf2_signal_frame_unwind;
  94 +
  95 +  return &dwarf2_frame_unwind;
  96  }
  97  \f
  98
  99 Index: src/gdb/dwarf2-frame.h
 100 ===================================================================
 101 RCS file: /big/fsf/rsync/src-cvs/src/gdb/dwarf2-frame.h,v
 102 retrieving revision 1.6
 103 diff -u -p -r1.6 dwarf2-frame.h
 104 --- src/gdb/dwarf2-frame.h      28 Feb 2004 16:59:32 -0000      1.6
 105 +++ src/gdb/dwarf2-frame.h      7 Nov 2004 17:40:41 -0000
 106 @@ -79,6 +79,14 @@ extern void dwarf2_frame_set_init_reg (s
 107                                        void (*init_reg) (struct gdbarch *, int,
 108                                              struct dwarf2_frame_state_reg *));
 109
 110 +/* Set the architecture-specific signal trampoline recognition
 111 +   function for GDBARCH to SIGNAL_FRAME_P.  */
 112 +
 113 +extern void
 114 +  dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch,
 115 +                                  int (*signal_frame_p) (struct gdbarch *,
 116 +                                                         struct frame_info *));
 117 +
 118  /* Return the frame unwind methods for the function that contains PC,
 119     or NULL if it can't be handled by DWARF CFI frame unwinder.  */
 120