[patch 1/3] Implement support for PowerPC BookE masked watchpoints

Thiago Jung Bauermann
2010-11-23T21:43:01Z

Hi,

I broke up the patch I submitted previously as "[patch 2/2] Implement
support for PowerPC BookE masked and ranged watchpoints" into the three
patches in this series. The first adds masked watchpoint support, the
second adds ranged watchpoints support (without the watch-range command)
and the third adds the polemic watch-range command.

This patch is a bigger than the others because it has to add code to
handle the new target methods extra_resources_needed,
works_in_software_mode and print_one_detail. The code is the same as
what was already reviewed though, except for fixing the GNU style
regarding whitespace in ppc_linux_{insert,remove}_mask_watchpoint.

I changed a bit the wording of the paragraph mentioning masked
watchpoint support in the NEWS file, and also added a "Changed Commands"
section so the NEWS entry needs another review. The manual part is the
same except for omitting the sentences about ranged watchpoint support.

Ok to commit?
--
[]'s
Thiago Jung Bauermann
IBM Linux Technology Center

2010-11-23 Sergio Durigan Junior <sergiodj@linux.vnet.ibm.com>
Thiago Jung Bauermann <bauerman@br.ibm.com>

Implement support for PowerPC BookE masked.

gdb/
*NEWS: Mention masked watchpoint support. Create "Changed commands"
sections and populate it based on other NEWS items.
* breakpoint.c (is_masked_watchpoint): Add prototype.
(update_watchpoint): Call breakpoint's
breakpoint_ops.extra_resources_needed and
breakpoint_ops.works_in_software_mode if available.
(watchpoints_triggered): Handle the case of a hardware masked
watchpoint trigger.
(watchpoint_check): Likewise.
(print_one_breakpoint_location): Call breakpoint's
breakpoint_ops.print_one_detail if available.
(hw_watchpoint_used_count): Call breakpoint's
breakpoint_ops.extra_resources_needed if available.
(insert_masked_watchpoint, remove_masked_watchpoint)
(extra_resources_needed_masked_watchpoint)
(works_in_software_mode_masked_watchpoint, print_it_masked_watchpoint)
(print_one_detail_masked_watchpoint, print_mention_masked_watchpoint)
(print_recreate_masked_watchpoint, is_masked_watchpoint): New
functions.
(masked_watchpoint_breakpoint_ops): New structure.
(watch_command_1): Check for the existence of the `mask' parameter.
Set b->ops according to the type of hardware watchpoint being created.
* breakpoint.h (struct ui_out): New opaque declaration.
(struct breakpoint_ops) <extra_resources_needed>,
<works_in_software_mode>, <print_one_detail>: New methods.
Initialize them to NULL in all existing breakpoint_ops instances.
(struct breakpoint_ops) <print_it>: Add OLD_VAL parameter. Update all
implementations of the method.
(enum hw_point_flag): New enumeration.
(struct breakpoint) <hw_wp_mask>: New field.
* ppc-linux-nat.c (ppc_linux_can_use_special_hw_point): New function.
(ppc_linux_insert_mask_watchpoint, ppc_linux_remove_mask_watchpoint)
(ppc_linux_hw_point_extra_slot_count): New functions.
(_initialize_ppc_linux_nat): Initialize to_insert_mask_watchpoint,
to_remove_mask_watchpoint, hw_point_extra_slot_count and
to_can_use_special_hw_point.
* target.c (update_current_target): Mention to_insert_mask_watchpoint,
to_remove_mask_watchpoint, to_hw_point_extra_slot_count
and to_can_use_special_hw_point.
(target_insert_mask_watchpoint, target_remove_mask_watchpoint)
(target_hw_point_extra_slot_count,
target_can_use_special_hw_point): New functions.
* target.h (enum hw_point_flag): New opaque declaration.
(struct target_ops) <to_insert_mask_watchpoint>,
<to_remove_mask_watchpoint>, <to_hw_point_extra_slot_count>,
<to_can_use_special_hw_point>: New callbacks.
(target_insert_mask_watchpoint, target_remove_mask_watchpoint)
(target_hw_point_extra_slot_count,
target_can_use_special_hw_point): Add prototypes.

gdb/doc/
* gdb.texinfo (Set Watchpoints): Document mask parameter.
(PowerPC Embedded): Document masked watchpoints.

diff --git a/gdb/NEWS b/gdb/NEWS
index 38478c4..3fa763c 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -85,6 +85,14 @@
libthread_db library with the "set libthread-db-search-path"
command. See the user manual for more details on this command.

+* When locally debugging programs on PowerPC BookE processors running
+ a Linux kernel version 2.6.34 or later GDB supports masked hardware
+ watchpoints, which specifiy a mask in addition to an address to watch.
+ The mask specifies that some bits of an address (the bits which are
+ reset in the mask) should be ignored when matching the address accessed
+ by the inferior against the watchpoint address. See the "PowerPC Embedded"
+ section in the user manual for more details.
+
* New features in the GDB remote stub, GDBserver

** GDBserver is now supported on PowerPC LynxOS (versions 4.x and 5.x),
@@ -97,6 +105,19 @@

* Guile support was removed.

+* Changed commands
+
+watch EXPRESSION mask MASK_VALUE
+ The watch command now supports the mask argument which allows creation
+ of masked watchpoints, if the current architecture supports this feature.
+
+watch -location EXPRESSION
+watch -l EXPRESSION
+ The "watch" command now accepts an optional "-location" argument.
+ When used, this causes GDB to watch the memory referred to by the
+ expression. Such a watchpoint is never deleted due to it going out
+ of scope.
+
*** Changes in GDB 7.2

* Shared library support for remote targets by default
diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 76b20e7..2a36f48 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -10743,7 +10743,7 @@ print_recreate_exception (enum exception_catchpoint_kind ex,
/* Virtual table for "catch exception" breakpoints. */

static enum print_stop_action
-print_it_catch_exception (struct breakpoint *b)
+print_it_catch_exception (struct breakpoint *b, const struct value *old_val)
{
return print_it_exception (ex_catch_exception, b);
}
@@ -10771,8 +10771,11 @@ static struct breakpoint_ops catch_exception_breakpoint_ops =
NULL, /* insert */
NULL, /* remove */
NULL, /* breakpoint_hit */
+ NULL, /* extra_resources_needed */
+ NULL, /* works_in_software_mode */
print_it_catch_exception,
print_one_catch_exception,
+ NULL, /* print_one_detail */
print_mention_catch_exception,
print_recreate_catch_exception
};
@@ -10780,7 +10783,8 @@ static struct breakpoint_ops catch_exception_breakpoint_ops =
/* Virtual table for "catch exception unhandled" breakpoints. */

static enum print_stop_action
-print_it_catch_exception_unhandled (struct breakpoint *b)
+print_it_catch_exception_unhandled (struct breakpoint *b,
+ const struct value *old_val)
{
return print_it_exception (ex_catch_exception_unhandled, b);
}
@@ -10809,8 +10813,11 @@ static struct breakpoint_ops catch_exception_unhandled_breakpoint_ops = {
NULL, /* insert */
NULL, /* remove */
NULL, /* breakpoint_hit */
+ NULL, /* extra_resources_needed */
+ NULL, /* works_in_software_mode */
print_it_catch_exception_unhandled,
print_one_catch_exception_unhandled,
+ NULL, /* print_one_detail */
print_mention_catch_exception_unhandled,
print_recreate_catch_exception_unhandled
};
@@ -10818,7 +10825,7 @@ static struct breakpoint_ops catch_exception_unhandled_breakpoint_ops = {
/* Virtual table for "catch assert" breakpoints. */

static enum print_stop_action
-print_it_catch_assert (struct breakpoint *b)
+print_it_catch_assert (struct breakpoint *b, const struct value *old_val)
{
return print_it_exception (ex_catch_assert, b);
}
@@ -10845,8 +10852,11 @@ static struct breakpoint_ops catch_assert_breakpoint_ops = {
NULL, /* insert */
NULL, /* remove */
NULL, /* breakpoint_hit */
+ NULL, /* extra_resources_needed */
+ NULL, /* works_in_software_mode */
print_it_catch_assert,
print_one_catch_assert,
+ NULL, /* print_one_detail */
print_mention_catch_assert,
print_recreate_catch_assert
};
diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index 55a08c7..e9d2661 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -219,6 +219,8 @@ static void disable_trace_command (char *, int);

static void trace_pass_command (char *, int);

+static int is_masked_watchpoint (const struct breakpoint *b);
+
/* Assuming we're creating a static tracepoint, does S look like a
static tracepoint marker spec ("-m MARKER_ID")? */
#define is_marker_spec(s) \
@@ -1391,27 +1393,52 @@ update_watchpoint (struct breakpoint *b, int reparse)
if ((b->type == bp_watchpoint || b->type == bp_hardware_watchpoint)
&& reparse)
{
- int i, mem_cnt, other_type_used;
-
- /* We need to determine how many resources are already used
- for all other hardware watchpoints to see if we still have
- enough resources to also fit this watchpoint in as well.
- To avoid the hw_watchpoint_used_count call below from counting
- this watchpoint, make sure that it is marked as a software
- watchpoint. */
- b->type = bp_watchpoint;
- i = hw_watchpoint_used_count (bp_hardware_watchpoint,
- &other_type_used);
+ int mem_cnt;
+
mem_cnt = can_use_hardware_watchpoint (val_chain);

if (!mem_cnt)
- b->type = bp_watchpoint;
+ {
+ if (b->type == bp_hardware_watchpoint
+ && b->ops && b->ops->works_in_software_mode
+ && !b->ops->works_in_software_mode (b))
+ error (_("This watchpoint cannot be used in software mode."));
+ else
+ b->type = bp_watchpoint;
+ }
else
{
- int target_resources_ok = target_can_use_hardware_watchpoint
- (bp_hardware_watchpoint, i + mem_cnt, other_type_used);
+ int i, other_type_used, target_resources_ok;
+ enum bptype orig_type;
+
+ if (b->ops && b->ops->extra_resources_needed)
+ mem_cnt += b->ops->extra_resources_needed (b);
+
+ /* We need to determine how many resources are already used
+ for all other hardware watchpoints to see if we still have
+ enough resources to also fit this watchpoint in as well.
+ To avoid the hw_watchpoint_used_count call below from
+ counting this watchpoint, make sure that it is marked as a
+ software watchpoint. */
+ orig_type = b->type;
+ b->type = bp_watchpoint;
+ i = hw_watchpoint_used_count (bp_hardware_watchpoint,
+ &other_type_used);
+
+ target_resources_ok = target_can_use_hardware_watchpoint
+ (bp_hardware_watchpoint, i + mem_cnt, other_type_used)
if (target_resources_ok <= 0)
- b->type = bp_watchpoint;
+ {
+ if (orig_type == bp_hardware_watchpoint
+ && b->ops && b->ops->works_in_software_mode
+ && !b->ops->works_in_software_mode (b))
+ {
+ b->type = bp_hardware_watchpoint;
+ error (_("This watchpoint cannot be used in software mode."));
+ }
+ else
+ b->type = bp_watchpoint;
+ }
else
b->type = bp_hardware_watchpoint;
}
@@ -3386,7 +3413,7 @@ print_bp_stop_message (bpstat bs)
print_it_typical. */
/* FIXME: how breakpoint can ever be NULL here? */
if (b != NULL && b->ops != NULL && b->ops->print_it != NULL)
- return b->ops->print_it (b);
+ return b->ops->print_it (b, bs->old_val);
else
return print_it_typical (bs);
}
@@ -3522,15 +3549,30 @@ watchpoints_triggered (struct target_waitstatus *ws)

b->watchpoint_triggered = watch_triggered_no;
for (loc = b->loc; loc; loc = loc->next)
- /* Exact match not required. Within range is
- sufficient. */
- if (target_watchpoint_addr_within_range (&current_target,
- addr, loc->address,
- loc->length))
- {
- b->watchpoint_triggered = watch_triggered_yes;
- break;
- }
+ {
+ CORE_ADDR newaddr, start;
+
+ if (is_masked_watchpoint (loc->owner))
+ {
+ newaddr = addr & loc->owner->hw_wp_mask;
+ start = loc->address & loc->owner->hw_wp_mask;
+ }
+ else
+ {
+ newaddr = addr;
+ start = loc->address;
+ }
+
+ /* Exact match not required. Within range is
+ sufficient. */
+ if (target_watchpoint_addr_within_range (&current_target,
+ newaddr, start,
+ loc->length))
+ {
+ b->watchpoint_triggered = watch_triggered_yes;
+ break;
+ }
+ }
}

return 1;
@@ -3644,6 +3686,11 @@ watchpoint_check (void *p)
b->val_valid = 1;
return WP_VALUE_CHANGED;
}
+ else if (is_masked_watchpoint (b))
+ /* Since we don't know the exact trigger address (from
+ stopped_data_address), just tell the user we've triggered
+ a mask watchpoint. */
+ return WP_VALUE_CHANGED;
else
{
/* Nothing changed. */
@@ -4714,9 +4761,12 @@ print_one_breakpoint_location (struct breakpoint *b,
ui_out_field_int (uiout, "task", b->task);
}
}
-
+
ui_out_text (uiout, "\n");
-
+
+ if (!part_of_multiple && b->ops && b->ops->print_one_detail)
+ b->ops->print_one_detail (b, uiout);
+
if (!part_of_multiple && b->static_trace_marker_id)
{
gdb_assert (b->type == bp_static_tracepoint);
@@ -5890,7 +5940,7 @@ breakpoint_hit_catch_fork (struct breakpoint *b)
/* Implement the "print_it" breakpoint_ops method for fork catchpoints. */

static enum print_stop_action
-print_it_catch_fork (struct breakpoint *b)
+print_it_catch_fork (struct breakpoint *b, const struct value *old_val)
{
annotate_catchpoint (b->number);
printf_filtered (_("\nCatchpoint %d (forked process %d), "),
@@ -5948,8 +5998,11 @@ static struct breakpoint_ops catch_fork_breakpoint_ops =
insert_catch_fork,
remove_catch_fork,
breakpoint_hit_catch_fork,
+ NULL, /* extra_resources_needed */
+ NULL, /* works_in_software_mode */
print_it_catch_fork,
print_one_catch_fork,
+ NULL, /* print_one_detail */
print_mention_catch_fork,
print_recreate_catch_fork
};
@@ -5982,7 +6035,7 @@ breakpoint_hit_catch_vfork (struct breakpoint *b)
/* Implement the "print_it" breakpoint_ops method for vfork catchpoints. */

static enum print_stop_action
-print_it_catch_vfork (struct breakpoint *b)
+print_it_catch_vfork (struct breakpoint *b, const struct value *old_val)
{
annotate_catchpoint (b->number);
printf_filtered (_("\nCatchpoint %d (vforked process %d), "),
@@ -6039,8 +6092,11 @@ static struct breakpoint_ops catch_vfork_breakpoint_ops =
insert_catch_vfork,
remove_catch_vfork,
breakpoint_hit_catch_vfork,
+ NULL, /* extra_resources_needed */
+ NULL, /* works_in_software_mode */
print_it_catch_vfork,
print_one_catch_vfork,
+ NULL, /* print_one_detail */
print_mention_catch_vfork,
print_recreate_catch_vfork
};
@@ -6160,7 +6216,7 @@ breakpoint_hit_catch_syscall (struct breakpoint *b)
catchpoints. */

static enum print_stop_action
-print_it_catch_syscall (struct breakpoint *b)
+print_it_catch_syscall (struct breakpoint *b, const struct value *old_val)
{
/* These are needed because we want to know in which state a
syscall is. It can be in the TARGET_WAITKIND_SYSCALL_ENTRY
@@ -6320,8 +6376,11 @@ static struct breakpoint_ops catch_syscall_breakpoint_ops =
insert_catch_syscall,
remove_catch_syscall,
breakpoint_hit_catch_syscall,
+ NULL, /* extra_resources_needed */
+ NULL, /* works_in_software_mode */
print_it_catch_syscall,
print_one_catch_syscall,
+ NULL, /* print_one_detail */
print_mention_catch_syscall,
print_recreate_catch_syscall
};
@@ -6423,7 +6482,7 @@ breakpoint_hit_catch_exec (struct breakpoint *b)
}

static enum print_stop_action
-print_it_catch_exec (struct breakpoint *b)
+print_it_catch_exec (struct breakpoint *b, const struct value *old_val)
{
annotate_catchpoint (b->number);
printf_filtered (_("\nCatchpoint %d (exec'd %s), "), b->number,
@@ -6473,8 +6532,11 @@ static struct breakpoint_ops catch_exec_breakpoint_ops =
insert_catch_exec,
remove_catch_exec,
breakpoint_hit_catch_exec,
+ NULL, /* extra_resources_needed */
+ NULL, /* works_in_software_mode */
print_it_catch_exec,
print_one_catch_exec,
+ NULL, /* print_one_detail */
print_mention_catch_exec,
print_recreate_catch_exec
};
@@ -6522,7 +6584,14 @@ hw_watchpoint_used_count (enum bptype type, int *other_type_used)
if (breakpoint_enabled (b))
{
if (b->type == type)
- i++;
+ {
+ i++;
+
+ /* Special types of hardware watchpoints can use more than
+ one register. */
+ if (b->ops && b->ops->extra_resources_needed)
+ i += b->ops->extra_resources_needed (b);
+ }
else if (is_hardware_watchpoint (b))
*other_type_used = 1;
}
@@ -8080,12 +8149,206 @@ static struct breakpoint_ops watchpoint_breakpoint_ops =
insert_watchpoint,
remove_watchpoint,
NULL, /* breakpoint_hit */
+ NULL, /* extra_resources_needed */
+ NULL, /* works_in_software_mode */
NULL, /* print_it */
NULL, /* print_one */
+ NULL, /* print_one_detail */
NULL, /* print_mention */
NULL /* print_recreate */
};

+/* Implement the "insert" breakpoint_ops method for
+ masked hardware watchpoints. */
+
+static int
+insert_masked_watchpoint (struct bp_location *bpt)
+{
+ return target_insert_mask_watchpoint (bpt->address, bpt->owner->hw_wp_mask,
+ bpt->watchpoint_type);
+}
+
+/* Implement the "remove" breakpoint_ops method for
+ masked hardware watchpoints. */
+
+static int
+remove_masked_watchpoint (struct bp_location *bpt)
+{
+ return target_remove_mask_watchpoint (bpt->address, bpt->owner->hw_wp_mask,
+ bpt->watchpoint_type);
+}
+
+/* Implement the "extra_resources_needed" breakpoint_ops method for
+ masked hardware watchpoints. */
+
+static int
+extra_resources_needed_masked_watchpoint (const struct breakpoint *b)
+{
+ return target_hw_point_extra_slot_count (HW_POINT_MASKED_WATCH);
+}
+
+/* Implement the "works_in_software_mode_masked_watchpoint" breakpoint_ops
+ method for masked hardware watchpoints. */
+
+static int
+works_in_software_mode_masked_watchpoint (const struct breakpoint *b)
+{
+ return 0;
+}
+
+/* Implement the "print_it" breakpoint_ops method for
+ masked hardware watchpoints. */
+
+static enum print_stop_action
+print_it_masked_watchpoint (struct breakpoint *b, const struct value *old_val)
+{
+ struct ui_stream *stb;
+ struct cleanup *old_chain;
+
+ stb = ui_out_stream_new (uiout);
+ old_chain = make_cleanup_ui_out_stream_delete (stb);
+
+ switch (b->type)
+ {
+ case bp_hardware_watchpoint:
+ annotate_watchpoint (b->number);
+ if (ui_out_is_mi_like_p (uiout))
+ ui_out_field_string
+ (uiout, "reason",
+ async_reason_lookup (EXEC_ASYNC_WATCHPOINT_TRIGGER));
+ break;
+
+ case bp_read_watchpoint:
+ if (ui_out_is_mi_like_p (uiout))
+ ui_out_field_string
+ (uiout, "reason",
+ async_reason_lookup (EXEC_ASYNC_READ_WATCHPOINT_TRIGGER));
+ break;
+
+ case bp_access_watchpoint:
+ if (old_val != NULL)
+ annotate_watchpoint (b->number);
+ if (ui_out_is_mi_like_p (uiout))
+ ui_out_field_string
+ (uiout, "reason",
+ async_reason_lookup (EXEC_ASYNC_ACCESS_WATCHPOINT_TRIGGER));
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("Invalid hardware watchpoint type."));
+ }
+
+ mention (b);
+ ui_out_text (uiout, _("\nCheck the underlying instruction \
+at PC for address and value related to this watchpoint trigger.\n"));
+ ui_out_text (uiout, "\n");
+
+ do_cleanups (old_chain);
+
+ /* More than one watchpoint may have been triggered. */
+ return PRINT_UNKNOWN;
+}
+
+/* Implement the "print_one_detail" breakpoint_ops method for
+ masked hardware watchpoints. */
+
+static void
+print_one_detail_masked_watchpoint (const struct breakpoint *b, struct ui_out *uiout)
+{
+ ui_out_text (uiout, "\tmask ");
+
+ /* I don't know whether it's possible to get here without a b->loc,
+ but we can handle the situation. */
+ if (b->loc)
+ ui_out_field_core_addr (uiout, "mask", b->loc->gdbarch, b->hw_wp_mask);
+ else
+ ui_out_field_string (uiout, "mask", core_addr_to_string (b->hw_wp_mask));
+
+ ui_out_text (uiout, "\n");
+}
+
+/* Implement the "print_mention" breakpoint_ops method for
+ masked hardware watchpoints. */
+
+static void
+print_mention_masked_watchpoint (struct breakpoint *b)
+{
+ struct cleanup *ui_out_chain;
+
+ switch (b->type)
+ {
+ case bp_hardware_watchpoint:
+ ui_out_text (uiout, "Masked hardware watchpoint ");
+ ui_out_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "wpt");
+ break;
+ case bp_read_watchpoint:
+ ui_out_text (uiout, "Masked hardware read watchpoint ");
+ ui_out_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "hw-rwpt");
+ break;
+ case bp_access_watchpoint:
+ ui_out_text (uiout, "Masked hardware access (read/write) watchpoint ");
+ ui_out_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "hw-awpt");
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("Invalid hardware watchpoint type."));
+ }
+
+ ui_out_field_int (uiout, "number", b->number);
+ ui_out_text (uiout, ": ");
+ ui_out_field_string (uiout, "exp", b->exp_string);
+ do_cleanups (ui_out_chain);
+}
+
+static void
+print_recreate_masked_watchpoint (struct breakpoint *b, struct ui_file *fp)
+{
+ char tmp[40];
+
+ switch (b->type)
+ {
+ case bp_hardware_watchpoint:
+ fprintf_unfiltered (fp, "watch");
+ break;
+ case bp_read_watchpoint:
+ fprintf_unfiltered (fp, "rwatch");
+ break;
+ case bp_access_watchpoint:
+ fprintf_unfiltered (fp, "awatch");
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("Invalid hardware watchpoint type."));
+ }
+
+ sprintf_vma (tmp, b->hw_wp_mask);
+ fprintf_unfiltered (fp, " %s mask 0x%s", b->exp_string, tmp);
+}
+
+/* The breakpoint_ops structure to be used in masked hardware watchpoints. */
+
+static struct breakpoint_ops masked_watchpoint_breakpoint_ops =
+{
+ insert_masked_watchpoint,
+ remove_masked_watchpoint,
+ NULL, /* breakpoint_hit */
+ extra_resources_needed_masked_watchpoint,
+ works_in_software_mode_masked_watchpoint,
+ print_it_masked_watchpoint,
+ NULL, /* print_one */
+ print_one_detail_masked_watchpoint,
+ print_mention_masked_watchpoint,
+ print_recreate_masked_watchpoint
+};
+
+/* Tells whether the given watchpoint is a masked hardware watchpoint. */
+
+static int
+is_masked_watchpoint (const struct breakpoint *b)
+{
+ return b->ops == &masked_watchpoint_breakpoint_ops;
+}
+
/* accessflag: hw_write: watch write,
hw_read: watch read,
hw_access: watch access (read or write) */
@@ -8100,8 +8363,8 @@ watch_command_1 (char *arg, int accessflag, int from_tty,
struct frame_info *frame;
char *exp_start = NULL;
char *exp_end = NULL;
- char *tok, *id_tok_start, *end_tok;
- int toklen;
+ char *tok, *end_tok;
+ int toklen = -1;
char *cond_start = NULL;
char *cond_end = NULL;
int i, other_type_used, target_resources_ok = 0;
@@ -8109,66 +8372,95 @@ watch_command_1 (char *arg, int accessflag, int from_tty,
int mem_cnt = 0;
int thread = -1;
int pc = 0;
+ /* Flag to indicate whether we are going to use masks for
+ the hardware watchpoint. */
+ int use_mask = 0;
+ CORE_ADDR hw_wp_mask = 0;

/* Make sure that we actually have parameters to parse. */
if (arg != NULL && arg[0] != '\0')
{
- toklen = strlen (arg); /* Size of argument list. */
+ char *value_start;

- /* Points tok to the end of the argument list. */
- tok = arg + toklen - 1;
+ /* Look for "parameter value" pairs at the end
+ of the arguments string. */
+ for (tok = arg + strlen (arg) - 1; tok > arg; tok--)
+ {
+ /* Skip whitespace at the end of the argument list. */
+ while (tok > arg && (*tok == ' ' || *tok == '\t'))
+ tok--;
+
+ /* Find the beginning of the last token.
+ This is the value of the parameter. */
+ while (tok > arg && (*tok != ' ' && *tok != '\t'))
+ tok--;
+ value_start = tok + 1;
+
+ /* Skip whitespace. */
+ while (tok > arg && (*tok == ' ' || *tok == '\t'))
+ tok--;
+
+ end_tok = tok;
+
+ /* Find the beginning of the second to last token.
+ This is the parameter itself. */
+ while (tok > arg && (*tok != ' ' && *tok != '\t'))
+ tok--;
+ tok++;
+ toklen = end_tok - tok + 1;
+
+ if (toklen == 6 && !strncmp (tok, "thread", 6))
+ {
+ /* At this point we've found a "thread" token, which means
+ the user is trying to set a watchpoint that triggers
+ only in a specific thread. */
+ char *endp;

- /* Go backwards in the parameters list. Skip the last parameter.
- If we're expecting a 'thread <thread_num>' parameter, this should
- be the thread identifier. */
- while (tok > arg && (*tok == ' ' || *tok == '\t'))
- tok--;
- while (tok > arg && (*tok != ' ' && *tok != '\t'))
- tok--;
+ if (thread != -1)
+ error(_("You can specify only one thread."));

- /* Points end_tok to the beginning of the last token. */
- id_tok_start = tok + 1;
+ /* Extract the thread ID from the next token. */
+ thread = strtol (value_start, &endp, 0);

- /* Go backwards in the parameters list. Skip one more parameter.
- If we're expecting a 'thread <thread_num>' parameter, we should
- reach a "thread" token. */
- while (tok > arg && (*tok == ' ' || *tok == '\t'))
- tok--;
+ /* Check if the user provided a valid numeric value for the
+ thread ID. */
+ if (*endp != ' ' && *endp != '\t' && *endp != '\0')
+ error (_("Invalid thread ID specification %s."), value_start);

- end_tok = tok;
+ /* Check if the thread actually exists. */
+ if (!valid_thread_id (thread))
+ error (_("Unknown thread %d."), thread);
+ }
+ else if (toklen == 4 && !strncmp (tok, "mask", 4))
+ {
+ /* We've found a "mask" token, which means the user wants to
+ create a hardware watchpoint that is going to have the mask
+ facility. */
+ struct value *mask_value, *mark;

- while (tok > arg && (*tok != ' ' && *tok != '\t'))
- tok--;
+ /* Does the target support masked watchpoints? */
+ if (!target_can_use_special_hw_point (HW_POINT_MASKED_WATCH))
+ error (_("\
+This target does not support the usage of masks with hardware watchpoints."));

- /* Move the pointer forward to skip the whitespace and
- calculate the length of the token. */
- tok++;
- toklen = end_tok - tok;
+ if (use_mask)
+ error(_("You can specify only one mask."));

- if (toklen >= 1 && strncmp (tok, "thread", toklen) == 0)
- {
- /* At this point we've found a "thread" token, which means
- the user is trying to set a watchpoint that triggers
- only in a specific thread. */
- char *endp;
-
- /* Extract the thread ID from the next token. */
- thread = strtol (id_tok_start, &endp, 0);
-
- /* Check if the user provided a valid numeric value for the
- thread ID. */
- if (*endp != ' ' && *endp != '\t' && *endp != '\0')
- error (_("Invalid thread ID specification %s."), id_tok_start);
-
- /* Check if the thread actually exists. */
- if (!valid_thread_id (thread))
- error (_("Unknown thread %d."), thread);
-
- /* Truncate the string and get rid of the thread <thread_num>
- parameter before the parameter list is parsed by the
- evaluate_expression() function. */
- *tok = '\0';
- }
+ use_mask = 1;
+
+ mark = value_mark ();
+ mask_value = parse_to_comma_and_eval (&value_start);
+ hw_wp_mask = value_as_address (mask_value);
+ value_free_to_mark (mark);
+ }
+ else
+ /* We didn't recognize what we found. We should stop here. */
+ break;
+
+ /* Truncate the string and get rid of the "parameter value" pair before
+ the arguments string is parsed by the parse_exp_1 function. */
+ *tok = '\0';
+ }
}

/* Parse the rest of the arguments. */
@@ -8246,6 +8538,11 @@ watch_command_1 (char *arg, int accessflag, int from_tty,
error (_("Expression cannot be implemented with read/access watchpoint."));
if (mem_cnt != 0)
{
+ /* If we are going to use masks, then we may need more
+ slots in order to use the hardware watchpoint. */
+ if (use_mask)
+ mem_cnt += target_hw_point_extra_slot_count (HW_POINT_MASKED_WATCH);
+
i = hw_watchpoint_used_count (bp_type, &other_type_used);
target_resources_ok =
target_can_use_hardware_watchpoint (bp_type, i + mem_cnt,
@@ -8257,10 +8554,19 @@ watch_command_1 (char *arg, int accessflag, int from_tty,
error (_("Target can only support one kind of HW watchpoint at a time."));
}

- /* Change the type of breakpoint to an ordinary watchpoint if a hardware
- watchpoint could not be set. */
if (!mem_cnt || target_resources_ok <= 0)
- bp_type = bp_watchpoint;
+ {
+ if (use_mask && !mem_cnt)
+ error (_("Cannot use masks with the given expression."));
+ else if (use_mask && target_resources_ok <= 0)
+ error (_("\
+Cannot use masks without enough available hardware watchpoints (need %d)."),
+ mem_cnt);
+ else
+ /* Change the type of breakpoint to an ordinary watchpoint if a
+ hardware watchpoint could not be set. */
+ bp_type = bp_watchpoint;
+ }

frame = block_innermost_frame (exp_valid_block);

@@ -8328,7 +8634,14 @@ watch_command_1 (char *arg, int accessflag, int from_tty,
b->exp_string = savestring (exp_start, exp_end - exp_start);
b->val = val;
b->val_valid = 1;
- b->ops = &watchpoint_breakpoint_ops;
+
+ if (use_mask)
+ {
+ b->hw_wp_mask = hw_wp_mask;
+ b->ops = &masked_watchpoint_breakpoint_ops;
+ }
+ else
+ b->ops = &watchpoint_breakpoint_ops;

if (cond_start)
b->cond_string = savestring (cond_start, cond_end - cond_start);
@@ -8756,7 +9069,8 @@ catch_exec_command_1 (char *arg, int from_tty,
}

static enum print_stop_action
-print_exception_catchpoint (struct breakpoint *b)
+print_it_exception_catchpoint (struct breakpoint *b,
+ const struct value *old_val)
{
int bp_temp, bp_throw;

@@ -8845,8 +9159,11 @@ static struct breakpoint_ops gnu_v3_exception_catchpoint_ops = {
NULL, /* insert */
NULL, /* remove */
NULL, /* breakpoint_hit */
- print_exception_catchpoint,
+ NULL, /* extra_resources_needed */
+ NULL, /* works_in_software_mode */
+ print_it_exception_catchpoint,
print_one_exception_catchpoint,
+ NULL, /* print_one_detail */
print_mention_exception_catchpoint,
print_recreate_exception_catchpoint
};
diff --git a/gdb/breakpoint.h b/gdb/breakpoint.h
index 84f8a39..f7faf17 100644
--- a/gdb/breakpoint.h
+++ b/gdb/breakpoint.h
@@ -31,6 +31,7 @@

struct value;
struct block;
+struct ui_out;

/* This is the maximum number of bytes a breakpoint instruction can take.
Feel free to increase it. It's just used in a few places to size
@@ -366,13 +367,37 @@ struct breakpoint_ops
breakpoint was hit. */
int (*breakpoint_hit) (struct breakpoint *);

+ /* Tell how many additional hardware resources (debug registers) are needed
+ for this breakpoint. We always count at least one resource. If this
+ element is NULL, then no additional resources are needed. */
+ int (*extra_resources_needed) (const struct breakpoint *);
+
+ /* Tell whether we can downgrade from a hardware watchpoint to a software
+ one. If not, the user will not be able to enable the watchpoint when
+ there are not enough hardware resources available. */
+ int (*works_in_software_mode) (const struct breakpoint *);
+
/* The normal print routine for this breakpoint, called when we
hit it. */
- enum print_stop_action (*print_it) (struct breakpoint *);
+ enum print_stop_action (*print_it) (struct breakpoint *,
+ const struct value *old_val);

/* Display information about this breakpoint, for "info breakpoints". */
void (*print_one) (struct breakpoint *, struct bp_location **);

+ /* Display extra information about this breakpoint, below the normal
+ breakpoint description in "info breakpoints". In the example below,
+ the line with "memory range: [0x10094354, 0x100943a2]" was printed
+ by print_one_detail_ranged_watchpoint.
+
+ (gdb) info breakpoints
+ Num Type Disp Enb Address What
+ 2 hw watchpoint keep y b
+ memory range: [0x10094354, 0x100943a2]
+
+ */
+ void (*print_one_detail) (const struct breakpoint *, struct ui_out *);
+
/* Display information about this breakpoint after setting it (roughly
speaking; this is called from "mention"). */
void (*print_mention) (struct breakpoint *);
@@ -405,6 +430,12 @@ DEF_VEC_P(bp_location_p);
detail to the breakpoints module. */
struct counted_command_line;

+/* Special types of hardware breakpoints/watchpoints. */
+enum hw_point_flag
+ {
+ HW_POINT_MASKED_WATCH /* Hardware masked watchpoint. */
+ };
+
/* Note that the ->silent field is not currently used by any commands
(though the code is in there if it was to be, and set_raw_breakpoint
does set it to 0). I implemented it because I thought it would be
@@ -571,7 +602,10 @@ struct breakpoint
can sometimes be NULL for enabled GDBs as not all breakpoint
types are tracked by the Python scripting API. */
PyObject *py_bp_object;
-};
+
+ /* The mask address for a masked hardware watchpoint. */
+ CORE_ADDR hw_wp_mask;
+ };

typedef struct breakpoint *breakpoint_p;
DEF_VEC_P(breakpoint_p);
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index ddc711b..b7f26c6 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -3714,7 +3714,7 @@ watchpoints, which do not slow down the running of your program.

@table @code
@kindex watch
-@item watch @r{[}-l@r{|}-location@r{]} @var{expr} @r{[}thread @var{threadnum}@r{]}
+@item watch @r{[}-l@r{|}-location@r{]} @var{expr} @r{[}thread @var{threadnum}@r{]} @r{[}mask @var{maskvalue}@r{]}
Set a watchpoint for an expression. @value{GDBN} will break when the
expression @var{expr} is written into by the program and its value
changes. The simplest (and the most popular) use of this command is
@@ -3725,12 +3725,17 @@ to watch the value of a single variable:
@end smallexample

If the command includes a @code{@r{[}thread @var{threadnum}@r{]}}
-clause, @value{GDBN} breaks only when the thread identified by
+argument, @value{GDBN} breaks only when the thread identified by
@var{threadnum} changes the value of @var{expr}. If any other threads
change the value of @var{expr}, @value{GDBN} will not break. Note
that watchpoints restricted to a single thread in this way only work
with Hardware Watchpoints.

+The @code{@r{[}mask @var{maskvalue}@r{]}} argument allows creation
+of masked watchpoints, if the current architecture supports this
+feature. (Currently, this is only available on PowerPC Embedded
+architecture, see @ref{PowerPC Embedded}.)
+
Ordinarily a watchpoint respects the scope of variables in @var{expr}
(see below). The @code{-location} argument tells @value{GDBN} to
instead watch the memory referred to by @var{expr}. In this case,
@@ -3741,12 +3746,12 @@ result does not have an address, then @value{GDBN} will print an
error.

@kindex rwatch
-@item rwatch @r{[}-l@r{|}-location@r{]} @var{expr} @r{[}thread @var{threadnum}@r{]}
+@item rwatch @r{[}-l@r{|}-location@r{]} @var{expr} @r{[}thread @var{threadnum}@r{]} @r{[}mask @var{maskvalue}@r{]}
Set a watchpoint that will break when the value of @var{expr} is read
by the program.

@kindex awatch
-@item awatch @r{[}-l@r{|}-location@r{]} @var{expr} @r{[}thread @var{threadnum}@r{]}
+@item awatch @r{[}-l@r{|}-location@r{]} @var{expr} @r{[}thread @var{threadnum}@r{]} @r{[}mask @var{maskvalue}@r{]}
Set a watchpoint that will break when @var{expr} is either read from
or written into by the program.

@@ -18697,6 +18702,23 @@ The DVC register will be automatically used whenever @value{GDBN} detects
such pattern in a condition expression. This feature is available in native
@value{GDBN} running on a Linux kernel version 2.6.34 or newer.

+PowerPC embedded processors support masked watchpoints.
+
+A @dfn{masked watchpoint} specifies a mask in addition to an address
+to watch. The mask specifies that some bits of an address (the bits
+which are reset in the mask) should be ignored when matching the
+address accessed by the inferior against the watchpoint address.
+Thus, a masked watchpoint watches many addresses
+simultaneously---those addresses whose unmasked bits are identical
+to the unmasked bits in the watchpoint address.
+
+To set a masked watchpoint in @value{GDBN}, use the @code{mask} argument in
+the @code{watch} command (@pxref{Set Watchpoints}), as in:
+
+@smallexample
+(@value{GDBP}) watch *0xdeadbeef mask 0xffffff00
+@end smallexample
+
@value{GDBN} provides the following PowerPC-specific commands:

@table @code
diff --git a/gdb/ppc-linux-nat.c b/gdb/ppc-linux-nat.c
index 18ddee7..773a507 100644
--- a/gdb/ppc-linux-nat.c
+++ b/gdb/ppc-linux-nat.c
@@ -1478,6 +1478,22 @@ ppc_linux_can_use_hw_breakpoint (int type, int cnt, int ot)
}

static int
+ppc_linux_can_use_special_hw_point (struct target_ops *ops,
+ enum hw_point_flag flag)
+{
+ uint64_t features;
+
+ if (!have_ptrace_booke_interface ())
+ return 0;
+
+ if (flag != HW_POINT_MASKED_WATCH)
+ internal_error (__FILE__, __LINE__,
+ _("Unknown hardware breakpoint/watchpoint type."));
+
+ return booke_debug_info.features & PPC_DEBUG_FEATURE_DATA_BP_MASK;
+}
+
+static int
ppc_linux_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
{
/* Handle sub-8-byte quantities. */
@@ -1685,6 +1701,59 @@ get_trigger_type (int rw)
return t;
}

+static int
+ppc_linux_insert_mask_watchpoint (struct target_ops *ops, CORE_ADDR addr,
+ CORE_ADDR mask, int rw)
+{
+ ptid_t ptid;
+ struct lwp_info *lp;
+ struct ppc_hw_breakpoint p;
+
+ gdb_assert (have_ptrace_booke_interface ());
+
+ if ((mask & 0xC0000000) != 0xC0000000)
+ error (_("\
+The given mask covers kernel address space and cannot be used.\n\
+You have to delete the masked watchpoint to continue the debugging session."));
+
+ p.version = PPC_DEBUG_CURRENT_VERSION;
+ p.trigger_type = get_trigger_type (rw);
+ p.addr_mode = PPC_BREAKPOINT_MODE_MASK;
+ p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE;
+ p.addr = addr;
+ p.addr2 = mask;
+ p.condition_value = 0;
+
+ ALL_LWPS (lp, ptid)
+ booke_insert_point (&p, TIDGET (ptid));
+
+ return 0;
+}
+
+static int
+ppc_linux_remove_mask_watchpoint (struct target_ops *ops, CORE_ADDR addr,
+ CORE_ADDR mask, int rw)
+{
+ ptid_t ptid;
+ struct lwp_info *lp;
+ struct ppc_hw_breakpoint p;
+
+ gdb_assert (have_ptrace_booke_interface ());
+
+ p.version = PPC_DEBUG_CURRENT_VERSION;
+ p.trigger_type = get_trigger_type (rw);
+ p.addr_mode = PPC_BREAKPOINT_MODE_MASK;
+ p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE;
+ p.addr = addr;
+ p.addr2 = mask;
+ p.condition_value = 0;
+
+ ALL_LWPS (lp, ptid)
+ booke_remove_point (&p, TIDGET (ptid));
+
+ return 0;
+}
+
/* Check whether we have at least one free DVC register. */
static int
can_use_watchpoint_cond_accel (void)
@@ -2136,6 +2205,13 @@ ppc_linux_watchpoint_addr_within_range (struct target_ops *target,
return start <= addr + mask && start + length - 1 >= addr;
}

+static int
+ppc_linux_hw_point_extra_slot_count (struct target_ops *target,
+ enum hw_point_flag flag)
+{
+ return flag == HW_POINT_MASKED_WATCH;
+}
+
static void
ppc_linux_store_inferior_registers (struct target_ops *ops,
struct regcache *regcache, int regno)
@@ -2347,12 +2423,16 @@ _initialize_ppc_linux_nat (void)
t->to_insert_hw_breakpoint = ppc_linux_insert_hw_breakpoint;
t->to_remove_hw_breakpoint = ppc_linux_remove_hw_breakpoint;
t->to_region_ok_for_hw_watchpoint = ppc_linux_region_ok_for_hw_watchpoint;
+ t->to_can_use_special_hw_point = ppc_linux_can_use_special_hw_point;
t->to_insert_watchpoint = ppc_linux_insert_watchpoint;
t->to_remove_watchpoint = ppc_linux_remove_watchpoint;
+ t->to_insert_mask_watchpoint = ppc_linux_insert_mask_watchpoint;
+ t->to_remove_mask_watchpoint = ppc_linux_remove_mask_watchpoint;
t->to_stopped_by_watchpoint = ppc_linux_stopped_by_watchpoint;
t->to_stopped_data_address = ppc_linux_stopped_data_address;
t->to_watchpoint_addr_within_range = ppc_linux_watchpoint_addr_within_range;
t->to_can_accel_watchpoint_condition = ppc_linux_can_accel_watchpoint_condition;
+ t->to_hw_point_extra_slot_count = ppc_linux_hw_point_extra_slot_count;

t->to_read_description = ppc_linux_read_description;
t->to_auxv_parse = ppc_linux_auxv_parse;
diff --git a/gdb/target.c b/gdb/target.c
index dd976c9..84b6302 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -601,11 +601,14 @@ update_current_target (void)
INHERIT (to_files_info, t);
INHERIT (to_insert_breakpoint, t);
INHERIT (to_remove_breakpoint, t);
+ /* Do not inherit to_can_use_special_hw_point. */
INHERIT (to_can_use_hw_breakpoint, t);
INHERIT (to_insert_hw_breakpoint, t);
INHERIT (to_remove_hw_breakpoint, t);
INHERIT (to_insert_watchpoint, t);
INHERIT (to_remove_watchpoint, t);
+ /* Do not inherit to_insert_mask_watchpoint. */
+ /* Do not inherit to_remove_mask_watchpoint. */
INHERIT (to_stopped_data_address, t);
INHERIT (to_have_steppable_watchpoint, t);
INHERIT (to_have_continuable_watchpoint, t);
@@ -613,6 +616,7 @@ update_current_target (void)
INHERIT (to_watchpoint_addr_within_range, t);
INHERIT (to_region_ok_for_hw_watchpoint, t);
INHERIT (to_can_accel_watchpoint_condition, t);
+ /* Do not inherit to_hw_point_extra_slot_count. */
INHERIT (to_terminal_init, t);
INHERIT (to_terminal_inferior, t);
INHERIT (to_terminal_ours_for_output, t);
@@ -3334,6 +3338,76 @@ target_verify_memory (const gdb_byte *data, CORE_ADDR memaddr, ULONGEST size)
tcomplain ();
}

+int
+target_can_use_special_hw_point (enum hw_point_flag flag)
+{
+ struct target_ops *t;
+
+ for (t = current_target.beneath; t != NULL; t = t->beneath)
+ if (t->to_can_use_special_hw_point != NULL)
+ return t->to_can_use_special_hw_point (t, flag);
+
+ return return_zero ();
+}
+
+int
+target_insert_mask_watchpoint (CORE_ADDR addr, CORE_ADDR mask, int rw)
+{
+ struct target_ops *t;
+
+ for (t = current_target.beneath; t != NULL; t = t->beneath)
+ if (t->to_insert_mask_watchpoint != NULL)
+ {
+ int ret;
+
+ ret = t->to_insert_mask_watchpoint (t, addr, mask, rw);
+
+ if (targetdebug)
+ fprintf_unfiltered (gdb_stdlog, "\
+target_insert_mask_watchpoint (%s, %s, %d) = %d\n", core_addr_to_string (addr),
+ core_addr_to_string (mask), rw, ret);
+
+ return ret;
+ }
+
+ return return_minus_one ();
+}
+
+int
+target_remove_mask_watchpoint (CORE_ADDR addr, CORE_ADDR mask, int rw)
+{
+ struct target_ops *t;
+
+ for (t = current_target.beneath; t != NULL; t = t->beneath)
+ if (t->to_remove_mask_watchpoint != NULL)
+ {
+ int ret;
+
+ ret = t->to_remove_mask_watchpoint (t, addr, mask, rw);
+
+ if (targetdebug)
+ fprintf_unfiltered (gdb_stdlog, "\
+target_remove_mask_watchpoint (%s, %s, %d) = %d\n", core_addr_to_string (addr),
+ core_addr_to_string (mask), rw, ret);
+
+ return ret;
+ }
+
+ return return_minus_one ();
+}
+
+int
+target_hw_point_extra_slot_count (enum hw_point_flag flag)
+{
+ struct target_ops *t;
+
+ for (t = current_target.beneath; t != NULL; t = t->beneath)
+ if (t->to_hw_point_extra_slot_count != NULL)
+ return t->to_hw_point_extra_slot_count (t, flag);
+
+ return return_zero ();
+}
+
static void
debug_to_prepare_to_store (struct regcache *regcache)
{
diff --git a/gdb/target.h b/gdb/target.h
index bc70107..0d4bdcd 100644
--- a/gdb/target.h
+++ b/gdb/target.h
@@ -39,6 +39,8 @@ struct static_tracepoint_marker;

struct expression;

+enum hw_point_flag;
+
/* This include file defines the interface between the main part
of the debugger, and the part which is target-specific, or
specific to the communications interface between us and the
@@ -438,6 +440,8 @@ struct target_ops
int (*to_insert_breakpoint) (struct gdbarch *, struct bp_target_info *);
int (*to_remove_breakpoint) (struct gdbarch *, struct bp_target_info *);
int (*to_can_use_hw_breakpoint) (int, int, int);
+ int (*to_can_use_special_hw_point) (struct target_ops *,
+ enum hw_point_flag);
int (*to_insert_hw_breakpoint) (struct gdbarch *, struct bp_target_info *);
int (*to_remove_hw_breakpoint) (struct gdbarch *, struct bp_target_info *);

@@ -446,6 +450,10 @@ struct target_ops
int (*to_remove_watchpoint) (CORE_ADDR, int, int, struct expression *);
int (*to_insert_watchpoint) (CORE_ADDR, int, int, struct expression *);

+ int (*to_insert_mask_watchpoint) (struct target_ops *,
+ CORE_ADDR, CORE_ADDR, int);
+ int (*to_remove_mask_watchpoint) (struct target_ops *,
+ CORE_ADDR, CORE_ADDR, int);
int (*to_stopped_by_watchpoint) (void);
int to_have_steppable_watchpoint;
int to_have_continuable_watchpoint;
@@ -455,6 +463,8 @@ struct target_ops
int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
int (*to_can_accel_watchpoint_condition) (CORE_ADDR, int, int,
struct expression *);
+ int (*to_hw_point_extra_slot_count) (struct target_ops *,
+ enum hw_point_flag);
void (*to_terminal_init) (void);
void (*to_terminal_inferior) (void);
void (*to_terminal_ours_for_output) (void);
@@ -1316,6 +1326,10 @@ extern char *normal_pid_to_str (ptid_t ptid);
#define target_region_ok_for_hw_watchpoint(addr, len) \
(*current_target.to_region_ok_for_hw_watchpoint) (addr, len)

+/* Returns non-zero if the target supports the special type of hardware
+ breakpoint/watchpoint represented by FLAG. */
+
+extern int target_can_use_special_hw_point (enum hw_point_flag);

/* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.
TYPE is 0 for write, 1 for read, and 2 for read/write accesses.
@@ -1329,6 +1343,11 @@ extern char *normal_pid_to_str (ptid_t ptid);
#define target_remove_watchpoint(addr, len, type, cond) \
(*current_target.to_remove_watchpoint) (addr, len, type, cond)

+/* Hardware watchpoints with an associated address mask. */
+
+extern int target_insert_mask_watchpoint (CORE_ADDR, CORE_ADDR, int);
+extern int target_remove_mask_watchpoint (CORE_ADDR, CORE_ADDR, int);
+
#define target_insert_hw_breakpoint(gdbarch, bp_tgt) \
(*current_target.to_insert_hw_breakpoint) (gdbarch, bp_tgt)

@@ -1357,6 +1376,8 @@ extern char *normal_pid_to_str (ptid_t ptid);
#define target_can_accel_watchpoint_condition(addr, len, type, cond) \
(*current_target.to_can_accel_watchpoint_condition) (addr, len, type, cond)

+extern int target_hw_point_extra_slot_count (enum hw_point_flag);
+
/* Target can execute in reverse? */
#define target_can_execute_reverse \
(current_target.to_can_execute_reverse ? \