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Make frv-tdep.c use new frame mechanisms.

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This commit is contained in:
Kevin Buettner 2003-09-08 23:01:29 +00:00
parent 68f6cf990a
commit 1cb761c72b
3 changed files with 259 additions and 187 deletions
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40
gdb/ChangeLog
View File

@ -1,3 +1,43 @@
2003-09-08 Kevin Buettner <kevinb@redhat.com>
* frv-tdep.c (frame-unwind.h, frame-base.h): Include.
(frame_extra_info): Rename this struct to frv_unwind_cache.
Delete fields ``fp_to_callers_sp_offset'' and ``lr_saved_on_stack''.
Add fields ``prev_sp'' and ``base''.
(frv_frame_chain, frv_frame_saved_pc, frv_frame_init_saved_regs)
(frv_saved_pc_after_call, frv_init_extra_frame_info)
(frv_push_return_address, frv_pop_frame, frv_pop_frame_regular):
Delete.
(frv_analyze_prologue): Add ``struct frv_unwind_cache *'' argument.
Revise all callers. Fill in the unwind cache argument and make
other adjustments to account for new frame mechanisms.
(frv_frame_unwind_cache, frv_frame_align, frv_unwind_pc)
(frv_frame_this_id, frv_frame_prev_register, frv_frame_sniffer)
(frv_frame_base_address, frv_unwind_dummy_id): New functions.
(frv_frame_unwind, frv_frame_base): New structs.
(frv_push_arguments): Change name to frv_push_dummy_call(). Add
additional arguments expected by this method and adjust function
body accordingly.
(frv_gdbarch_init): Remove calls to the following functions:
set_gdbarch_deprecated_init_frame_pc(),
set_gdbarch_deprecated_saved_pc_after_call(),
set_gdbarch_deprecated_frame_chain(),
set_gdbarch_deprecated_frame_saved_pc(),
set_gdbarch_deprecated_frame_init_saved_regs(),
set_gdbarch_deprecated_push_arguments(),
set_gdbarch_deprecated_push_return_address(),
set_gdbarch_deprecated_pop_frame(),
set_gdbarch_deprecated_call_dummy_words(),
set_gdbarch_deprecated_sizeof_call_dummy_words(),
set_gdbarch_deprecated_init_extra_frame_info(),
set_gdbarch_deprecated_dummy_write_sp(), and
set_gdbarch_deprecated_pc_in_call_dummy().
Add calls to the following functions:
set_gdbarch_unwind_pc(), set_gdbarch_unwind_sp(),
set_gdbarch_frame_align(), frame_unwind_append_sniffer(), and
frame_base_set_default().
* Makefile.in (frv-tdep.o): Update dependencies.
2003-09-09 Mark Kettenis <kettenis@gnu.org>
* dwarf2-frame.c (read_encoded_value): Add support for

2
gdb/Makefile.in
View File

@ -1770,7 +1770,7 @@ frame-unwind.o: frame-unwind.c $(defs_h) $(frame_h) $(frame_unwind_h) \
$(gdb_assert_h) $(dummy_frame_h)
frv-tdep.o: frv-tdep.c $(defs_h) $(gdb_string_h) $(inferior_h) $(symfile_h) \
$(gdbcore_h) $(arch_utils_h) $(regcache_h) $(frame_h) \
$(trad_frame_h)
$(frame_unwind_h) $(frame_base_h) $(trad_frame_h)
f-typeprint.o: f-typeprint.c $(defs_h) $(gdb_obstack_h) $(bfd_h) $(symtab_h) \
$(gdbtypes_h) $(expression_h) $(value_h) $(gdbcore_h) $(target_h) \
$(f_lang_h) $(gdb_string_h)

404
gdb/frv-tdep.c
View File

@ -26,6 +26,8 @@
#include "arch-utils.h"
#include "regcache.h"
#include "frame.h"
#include "frame-unwind.h"
#include "frame-base.h"
#include "trad-frame.h"
extern void _initialize_frv_tdep (void);
@ -40,9 +42,6 @@ static gdbarch_deprecated_extract_struct_value_address_ftype frv_extract_struct_
static gdbarch_frameless_function_invocation_ftype frv_frameless_function_invocation;
static gdbarch_deprecated_push_arguments_ftype frv_push_arguments;
static gdbarch_deprecated_saved_pc_after_call_ftype frv_saved_pc_after_call;
static void frv_frame_init_saved_regs (struct frame_info *frame);
static void frv_pop_frame_regular (struct frame_info *frame);
/* Register numbers. You can change these as needed, but don't forget
to update the simulator accordingly. */
@ -85,17 +84,14 @@ static LONGEST frv_call_dummy_words[] =
{0};
/* The contents of this structure can only be trusted after we've
frv_frame_init_saved_regs on the frame. */
struct frame_extra_info
struct frv_unwind_cache /* was struct frame_extra_info */
{
/* The offset from our frame pointer to our caller's stack
pointer. */
int fp_to_callers_sp_offset;
/* The previous frame's inner-most stack address. Used as this
frame ID's stack_addr. */
CORE_ADDR prev_sp;
/* Non-zero if we've saved our return address on the stack yet.
Zero if it's still sitting in the link register. */
int lr_saved_on_stack;
/* The frame's base, optionally used by the high-level debug info. */
CORE_ADDR base;
/* Table indicating the location of each and every register. */
struct trad_frame_saved_reg *saved_regs;
@ -274,55 +270,6 @@ frv_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenp)
return breakpoint;
}
static CORE_ADDR
frv_frame_chain (struct frame_info *frame)
{
CORE_ADDR saved_fp_addr;
struct frame_extra_info *extra_info =
get_frame_extra_info (frame);
if (extra_info &&
extra_info->saved_regs &&
extra_info->saved_regs[fp_regnum].addr != 0)
saved_fp_addr = extra_info->saved_regs[fp_regnum].addr;
else
/* Just assume it was saved in the usual place. */
saved_fp_addr = get_frame_base (frame);
return read_memory_integer (saved_fp_addr, 4);
}
static CORE_ADDR
frv_frame_saved_pc (struct frame_info *frame)
{
struct frame_extra_info *extra_info =
get_frame_extra_info (frame);
frv_frame_init_saved_regs (frame);
/* Perhaps the prologue analyzer recorded where it was stored.
(As of 14 Oct 2001, it never does.) */
if (extra_info && extra_info->saved_regs &&
extra_info->saved_regs[pc_regnum].addr != 0)
return read_memory_integer (extra_info->saved_regs[pc_regnum].addr, 4);
/* If the prologue analyzer tells us the link register was saved on
the stack, get it from there. */
if (extra_info->lr_saved_on_stack)
return read_memory_integer (get_frame_base (frame) + 8, 4);
/* Otherwise, it's still in LR.
However, if FRAME isn't the youngest frame, this is kind of
suspicious --- if this frame called somebody else, then its LR
has certainly been overwritten. */
if (! get_next_frame (frame))
return read_register (lr_regnum);
/* By default, assume it's saved in the standard place, relative to
the frame pointer. */
return read_memory_integer (get_frame_base (frame) + 8, 4);
}
/* Return true if REG is a caller-saves ("scratch") register,
false otherwise. */
@ -365,7 +312,8 @@ is_argument_reg (int reg)
arguments in any frame but the top, you'll need to do this serious
prologue analysis. */
static CORE_ADDR
frv_analyze_prologue (CORE_ADDR pc, struct frame_info *frame)
frv_analyze_prologue (CORE_ADDR pc, struct frame_info *next_frame,
struct frv_unwind_cache *info)
{
/* When writing out instruction bitpatterns, we use the following
letters to label instruction fields:
@ -390,12 +338,16 @@ frv_analyze_prologue (CORE_ADDR pc, struct frame_info *frame)
/* Total size of frame prior to any alloca operations. */
int framesize = 0;
/* Flag indicating if lr has been saved on the stack. */
int lr_saved_on_stack = 0;
/* The number of the general-purpose register we saved the return
address ("link register") in, or -1 if we haven't moved it yet. */
int lr_save_reg = -1;
/* Non-zero iff we've saved the LR onto the stack. */
int lr_saved_on_stack = 0;
/* Offset (from sp) at which lr has been saved on the stack. */
int lr_sp_offset = 0;
/* If gr_saved[i] is non-zero, then we've noticed that general
register i has been saved at gr_sp_offset[i] from the stack
@ -405,7 +357,7 @@ frv_analyze_prologue (CORE_ADDR pc, struct frame_info *frame)
memset (gr_saved, 0, sizeof (gr_saved));
while (! frame || pc < get_frame_pc (frame))
while (! next_frame || pc < frame_pc_unwind (next_frame))
{
LONGEST op = read_memory_integer (pc, 4);
@ -637,7 +589,10 @@ frv_analyze_prologue (CORE_ADDR pc, struct frame_info *frame)
/* Saving the old FP in the new frame (relative to the SP). */
if (gr_k == fp_regnum && gr_i == sp_regnum)
;
{
gr_saved[fp_regnum] = 1;
gr_sp_offset[fp_regnum] = offset;
}
/* Saving callee-saves register(s) on the stack, relative to
the SP. */
@ -645,13 +600,22 @@ frv_analyze_prologue (CORE_ADDR pc, struct frame_info *frame)
&& is_callee_saves_reg (gr_k))
{
gr_saved[gr_k] = 1;
gr_sp_offset[gr_k] = offset;
if (gr_i == sp_regnum)
gr_sp_offset[gr_k] = offset;
else
gr_sp_offset[gr_k] = offset + fp_offset;
}
/* Saving the scratch register holding the return address. */
else if (lr_save_reg != -1
&& gr_k == lr_save_reg)
lr_saved_on_stack = 1;
{
lr_saved_on_stack = 1;
if (gr_i == sp_regnum)
lr_sp_offset = offset;
else
lr_sp_offset = offset + fp_offset;
}
/* Spilling int-sized arguments to the stack. */
else if (is_argument_reg (gr_k))
@ -671,12 +635,10 @@ frv_analyze_prologue (CORE_ADDR pc, struct frame_info *frame)
pc += 4;
}
if (frame)
if (next_frame && info)
{
struct frame_extra_info *extra_info =
get_frame_extra_info (frame);
extra_info->lr_saved_on_stack = lr_saved_on_stack;
int i;
ULONGEST this_base;
/* If we know the relationship between the stack and frame
pointers, record the addresses of the registers we noticed.
@ -684,19 +646,29 @@ frv_analyze_prologue (CORE_ADDR pc, struct frame_info *frame)
because instructions may save relative to the SP, but we need
their addresses relative to the FP. */
if (fp_set)
{
struct trad_frame_saved_reg *saved_regs;
int i;
frame_unwind_unsigned_register (next_frame, fp_regnum, &this_base);
else
frame_unwind_unsigned_register (next_frame, sp_regnum, &this_base);
saved_regs = extra_info->saved_regs;
for (i = 0; i < 64; i++)
if (gr_saved[i])
trad_frame_set_value (saved_regs, i,
get_frame_base (frame) - fp_offset
+ gr_sp_offset[i]);
for (i = 0; i < 64; i++)
if (gr_saved[i])
info->saved_regs[i].addr = this_base - fp_offset + gr_sp_offset[i];
extra_info->fp_to_callers_sp_offset = framesize - fp_offset;
}
info->prev_sp = this_base - fp_offset + framesize;
info->base = this_base;
/* If LR was saved on the stack, record its location. */
if (lr_saved_on_stack)
info->saved_regs[lr_regnum].addr = this_base - fp_offset + lr_sp_offset;
/* The call instruction moves the caller's PC in the callee's LR.
Since this is an unwind, do the reverse. Copy the location of LR
into PC (the address / regnum) so that a request for PC will be
converted into a request for the LR. */
info->saved_regs[pc_regnum] = info->saved_regs[lr_regnum];
/* Save the previous frame's computed SP value. */
trad_frame_set_value (info->saved_regs, sp_regnum, info->prev_sp);
}
return pc;
@ -729,33 +701,33 @@ frv_skip_prologue (CORE_ADDR pc)
If we didn't find a real source location past that, then
do a full analysis of the prologue. */
if (new_pc < pc + 20)
new_pc = frv_analyze_prologue (pc, 0);
new_pc = frv_analyze_prologue (pc, 0, 0);
return new_pc;
}
static void
frv_frame_init_saved_regs (struct frame_info *frame)
static struct frv_unwind_cache *
frv_frame_unwind_cache (struct frame_info *next_frame,
void **this_prologue_cache)
{
struct frame_extra_info *extra_info =
get_frame_extra_info (frame);
struct gdbarch *gdbarch = get_frame_arch (next_frame);
CORE_ADDR pc;
ULONGEST prev_sp;
ULONGEST this_base;
struct frv_unwind_cache *info;
if (extra_info && extra_info->saved_regs)
return;
if ((*this_prologue_cache))
return (*this_prologue_cache);
extra_info->saved_regs = trad_frame_alloc_saved_regs (frame);
trad_frame_set_value (extra_info->saved_regs,
fp_regnum, get_frame_base (frame));
info = FRAME_OBSTACK_ZALLOC (struct frv_unwind_cache);
(*this_prologue_cache) = info;
info->saved_regs = trad_frame_alloc_saved_regs (next_frame);
/* Find the beginning of this function, so we can analyze its
prologue. */
{
CORE_ADDR func_addr, func_end;
/* Prologue analysis does the rest... */
frv_analyze_prologue (frame_func_unwind (next_frame), next_frame, info);
if (find_pc_partial_function (get_frame_pc (frame),
NULL, &func_addr, &func_end))
frv_analyze_prologue (func_addr, frame);
}
return info;
}
static void
@ -787,29 +759,21 @@ frv_frameless_function_invocation (struct frame_info *frame)
return frameless_look_for_prologue (frame);
}
static CORE_ADDR
frv_saved_pc_after_call (struct frame_info *frame)
{
return read_register (lr_regnum);
}
static void
frv_init_extra_frame_info (int fromleaf, struct frame_info *frame)
{
struct frame_extra_info *extra_info =
frame_extra_info_zalloc (frame, sizeof (struct frame_extra_info));
extra_info->fp_to_callers_sp_offset = 0;
extra_info->lr_saved_on_stack = 0;
extra_info->saved_regs = trad_frame_alloc_saved_regs (frame);
}
#define ROUND_UP(n,a) (((n)+(a)-1) & ~((a)-1))
#define ROUND_DOWN(n,a) ((n) & ~((a)-1))
static CORE_ADDR
frv_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_addr)
frv_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
{
/* Require dword alignment. */
return ROUND_DOWN (sp, 8);
}
static CORE_ADDR
frv_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr,
struct regcache *regcache, CORE_ADDR bp_addr,
int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_addr)
{
int argreg;
int argnum;
@ -844,7 +808,8 @@ frv_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
argreg = 8;
if (struct_return)
write_register (struct_return_regnum, struct_addr);
regcache_cooked_write_unsigned (regcache, struct_return_regnum,
struct_addr);
for (argnum = 0; argnum < nargs; ++argnum)
{
@ -876,7 +841,7 @@ frv_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
printf(" Argnum %d data %x -> reg %d\n",
argnum, (int) regval, argreg);
#endif
write_register (argreg, regval);
regcache_cooked_write_unsigned (regcache, argreg, regval);
++argreg;
}
else
@ -892,13 +857,14 @@ frv_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
val += partial_len;
}
}
return sp;
}
static CORE_ADDR
frv_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
{
write_register (lr_regnum, CALL_DUMMY_ADDRESS ());
/* Set the return address. For the frv, the return breakpoint is
always at BP_ADDR. */
regcache_cooked_write_unsigned (regcache, lr_regnum, bp_addr);
/* Finally, update the SP register. */
regcache_cooked_write_unsigned (regcache, sp_regnum, sp);
return sp;
}
@ -918,40 +884,6 @@ frv_store_return_value (struct type *type, char *valbuf)
"Don't know how to return a %d-byte value.", length);
}
static void
frv_pop_frame (void)
{
generic_pop_current_frame (frv_pop_frame_regular);
}
static void
frv_pop_frame_regular (struct frame_info *frame)
{
struct frame_extra_info *extra_info;
struct trad_frame_saved_reg *saved_regs;
CORE_ADDR fp;
int regno;
fp = get_frame_base (frame);
frv_frame_init_saved_regs (frame);
extra_info = get_frame_extra_info (frame);
saved_regs = extra_info->saved_regs;
write_register (pc_regnum, frv_frame_saved_pc (frame));
for (regno = 0; regno < frv_num_regs; ++regno)
{
if (extra_info->saved_regs[regno].addr
&& regno != pc_regnum
&& regno != sp_regnum)
{
write_register (regno,
read_memory_integer (saved_regs[regno].addr, 4));
}
}
write_register (sp_regnum, fp + extra_info->fp_to_callers_sp_offset);
flush_cached_frames ();
}
/* Hardware watchpoint / breakpoint support for the FR500
and FR400. */
@ -1008,6 +940,120 @@ frv_stopped_data_address (void)
return 0;
}
static CORE_ADDR
frv_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
return frame_unwind_register_unsigned (next_frame, pc_regnum);
}
/* Given a GDB frame, determine the address of the calling function's
frame. This will be used to create a new GDB frame struct. */
static void
frv_frame_this_id (struct frame_info *next_frame,
void **this_prologue_cache, struct frame_id *this_id)
{
struct frv_unwind_cache *info
= frv_frame_unwind_cache (next_frame, this_prologue_cache);
CORE_ADDR base;
CORE_ADDR func;
struct minimal_symbol *msym_stack;
struct frame_id id;
/* The FUNC is easy. */
func = frame_func_unwind (next_frame);
/* This is meant to halt the backtrace at "_start". Make sure we
don't halt it at a generic dummy frame. */
if (inside_entry_file (func))
return;
/* Check if the stack is empty. */
msym_stack = lookup_minimal_symbol ("_stack", NULL, NULL);
if (msym_stack && info->base == SYMBOL_VALUE_ADDRESS (msym_stack))
return;
/* Hopefully the prologue analysis either correctly determined the
frame's base (which is the SP from the previous frame), or set
that base to "NULL". */
base = info->prev_sp;
if (base == 0)
return;
id = frame_id_build (base, func);
/* Check that we're not going round in circles with the same frame
ID (but avoid applying the test to sentinel frames which do go
round in circles). Can't use frame_id_eq() as that doesn't yet
compare the frame's PC value. */
if (frame_relative_level (next_frame) >= 0
&& get_frame_type (next_frame) != DUMMY_FRAME
&& frame_id_eq (get_frame_id (next_frame), id))
return;
(*this_id) = id;
}
static void
frv_frame_prev_register (struct frame_info *next_frame,
void **this_prologue_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realnump, void *bufferp)
{
struct frv_unwind_cache *info
= frv_frame_unwind_cache (next_frame, this_prologue_cache);
trad_frame_prev_register (next_frame, info->saved_regs, regnum,
optimizedp, lvalp, addrp, realnump, bufferp);
}
static const struct frame_unwind frv_frame_unwind = {
NORMAL_FRAME,
frv_frame_this_id,
frv_frame_prev_register
};
static const struct frame_unwind *
frv_frame_sniffer (struct frame_info *next_frame)
{
return &frv_frame_unwind;
}
static CORE_ADDR
frv_frame_base_address (struct frame_info *next_frame, void **this_cache)
{
struct frv_unwind_cache *info
= frv_frame_unwind_cache (next_frame, this_cache);
return info->base;
}
static const struct frame_base frv_frame_base = {
&frv_frame_unwind,
frv_frame_base_address,
frv_frame_base_address,
frv_frame_base_address
};
static CORE_ADDR
frv_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
return frame_unwind_register_unsigned (next_frame, sp_regnum);
}
/* Assuming NEXT_FRAME->prev is a dummy, return the frame ID of that
dummy frame. The frame ID's base needs to match the TOS value
saved by save_dummy_frame_tos(), and the PC match the dummy frame's
breakpoint. */
static struct frame_id
frv_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
return frame_id_build (frv_unwind_sp (gdbarch, next_frame),
frame_pc_unwind (next_frame));
}
static struct gdbarch *
frv_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
@ -1044,10 +1090,6 @@ frv_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
gdbarch = gdbarch_alloc (&info, var);
/* NOTE: cagney/2002-12-06: This can be deleted when this arch is
ready to unwind the PC first (see frame.c:get_prev_frame()). */
set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default);
set_gdbarch_short_bit (gdbarch, 16);
set_gdbarch_int_bit (gdbarch, 32);
set_gdbarch_long_bit (gdbarch, 32);
@ -1078,13 +1120,6 @@ frv_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_frame_args_skip (gdbarch, 0);
set_gdbarch_frameless_function_invocation (gdbarch, frv_frameless_function_invocation);
set_gdbarch_deprecated_saved_pc_after_call (gdbarch, frv_saved_pc_after_call);
set_gdbarch_deprecated_frame_chain (gdbarch, frv_frame_chain);
set_gdbarch_deprecated_frame_saved_pc (gdbarch, frv_frame_saved_pc);
set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, frv_frame_init_saved_regs);
set_gdbarch_use_struct_convention (gdbarch, always_use_struct_convention);
set_gdbarch_deprecated_extract_return_value (gdbarch, frv_extract_return_value);
@ -1092,22 +1127,21 @@ frv_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_deprecated_store_return_value (gdbarch, frv_store_return_value);
set_gdbarch_deprecated_extract_struct_value_address (gdbarch, frv_extract_struct_value_address);
/* Settings for calling functions in the inferior. */
set_gdbarch_deprecated_push_arguments (gdbarch, frv_push_arguments);
set_gdbarch_deprecated_push_return_address (gdbarch, frv_push_return_address);
set_gdbarch_deprecated_pop_frame (gdbarch, frv_pop_frame);
/* Frame stuff. */
set_gdbarch_unwind_pc (gdbarch, frv_unwind_pc);
set_gdbarch_unwind_sp (gdbarch, frv_unwind_sp);
set_gdbarch_frame_align (gdbarch, frv_frame_align);
frame_unwind_append_sniffer (gdbarch, frv_frame_sniffer);
frame_base_set_default (gdbarch, &frv_frame_base);
set_gdbarch_deprecated_call_dummy_words (gdbarch, frv_call_dummy_words);
set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof (frv_call_dummy_words));
set_gdbarch_deprecated_init_extra_frame_info (gdbarch, frv_init_extra_frame_info);
/* Settings for calling functions in the inferior. */
set_gdbarch_push_dummy_call (gdbarch, frv_push_dummy_call);
set_gdbarch_unwind_dummy_id (gdbarch, frv_unwind_dummy_id);
/* Settings that should be unnecessary. */
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
set_gdbarch_write_pc (gdbarch, generic_target_write_pc);
set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp);
set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point);
set_gdbarch_decr_pc_after_break (gdbarch, 0);
set_gdbarch_function_start_offset (gdbarch, 0);
@ -1150,5 +1184,3 @@ _initialize_frv_tdep (void)
{
register_gdbarch_init (bfd_arch_frv, frv_gdbarch_init);
}