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gdb/gdb-6.3-threaded-watchpoints-20041213.patch

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2004-12-13 Jeff Johnston <jjohnstn@redhat.com>
* linux-nat.c: (stop_wait_callback, linux-nat-wait): Notify
observers of a sigtrap.
(delete_lwp): Free the saved_trap_data if present.
* linux-nat.h (struct lwp_info): Add saved_trap_data field.
(struct linux_watchpoint): New struct.
* linux-thread-db.c: Add support to always keep lwp info in ptids.
(attach_thread): Notify observers of a linux
new thread.
(thread_db_wait): Call check_event if SIGILL occurs.
* infrun.c: (handle_inferior_event): For platforms that
hit watchpoints prior to the data write, mark the watchpoints
so we know to check them after we step through the write.
* breakpoint.c (bpstat_stop_status): Fix up watchpoint code.
(insert_watchpoints_for_new_thread): New function.
(mark_triggered_watchpoints): Ditto.
* breakpoint.h (insert_watchpoints_for_new_thread): New prototype.
(mark_triggered_watchpoints): Ditto.
* i386-linux-nat.c (i386_linux_dr_get, i386_linux_dr_set): Use
TIDGET to get PTRACE lpw, otherwise fall back to PIDGET.
* amd64-linux-nat.c (amd64_linux_dr_get, amd64_linux_dr_set): Ditto.
* ia64-linux-nat.c: Add support for removing and inserting watchpoints
on all threads.
* s390-nat.c: Ditto.
* Makefile.in: Add observer.h and linux-nat.h to ia64-linux-nat.o
and s390-nat.o.
* doc/observer.texi: Add two new observers for linux_new_thread
and sigtrap.
2007-10-13 Jan Kratochvil <jan.kratochvil@redhat.com>
Port to GDB-6.7.
2007-11-02 Jan Kratochvil <jan.kratochvil@redhat.com>
Port to post-GDB-6.7.1 multi-PC breakpoints.
Index: gdb-6.7.1/gdb/doc/observer.texi
===================================================================
--- gdb-6.7.1.orig/gdb/doc/observer.texi 2007-05-11 21:55:20.000000000 +0200
+++ gdb-6.7.1/gdb/doc/observer.texi 2007-11-02 15:21:57.000000000 +0100
@@ -129,3 +129,12 @@ Called with @var{objfile} equal to @code
previously loaded symbol table data has now been invalidated.
@end deftypefun
+@deftypefun void linux_new_thread (ptid_t @var{ptid})
+A new linux thread described by @var{ptid} has been officially attached
+to by gdb.
+@end deftypefun
+
+@deftypefun void sigtrap (void * @var{data})
+A low-level SIGTRAP has been discovered. This notification can be used to save
+additional state necessary if the trap is deferred for later handling.
+@end deftypefun
Index: gdb-6.7.1/gdb/infrun.c
===================================================================
--- gdb-6.7.1.orig/gdb/infrun.c 2007-11-02 15:21:46.000000000 +0100
+++ gdb-6.7.1/gdb/infrun.c 2007-11-02 15:21:57.000000000 +0100
@@ -1781,9 +1781,19 @@ handle_inferior_event (struct execution_
single step over a watchpoint without disabling the watchpoint. */
if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws))
{
+ CORE_ADDR addr = 0;
+
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n");
- resume (1, 0);
+
+ target_stopped_data_address (&current_target, &addr);
+ mark_triggered_watchpoints (addr);
+ registers_changed ();
+ target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
+
+ ecs->waiton_ptid = ecs->ptid;
+ ecs->wp = &(ecs->ws);
+ ecs->infwait_state = infwait_nonstep_watch_state;
prepare_to_wait (ecs);
return;
}
@@ -1794,6 +1804,8 @@ handle_inferior_event (struct execution_
if (gdbarch_have_nonsteppable_watchpoint (current_gdbarch)
&& STOPPED_BY_WATCHPOINT (ecs->ws))
{
+ CORE_ADDR addr = 0;
+
/* At this point, we are stopped at an instruction which has
attempted to write to a piece of memory under control of
a watchpoint. The instruction hasn't actually executed
@@ -1801,15 +1813,12 @@ handle_inferior_event (struct execution_
now, we would get the old value, and therefore no change
would seem to have occurred.
- In order to make watchpoints work `right', we really need
- to complete the memory write, and then evaluate the
- watchpoint expression. The following code does that by
- removing the watchpoint (actually, all watchpoints and
- breakpoints), single-stepping the target, re-inserting
- watchpoints, and then falling through to let normal
- single-step processing handle proceed. Since this
- includes evaluating watchpoints, things will come to a
- stop in the correct manner. */
+ In order to make watchpoints work `right', we mark the
+ triggered watchpoints so that after we single step,
+ we will check for a value change. */
+
+ target_stopped_data_address (&current_target, &addr);
+ mark_triggered_watchpoints (addr);
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n");
@@ -1880,6 +1889,41 @@ handle_inferior_event (struct execution_
}
}
+ if (stop_signal == TARGET_SIGNAL_TRAP
+ && trap_expected
+ && gdbarch_single_step_through_delay_p (current_gdbarch)
+ && currently_stepping (ecs))
+ {
+ /* We're trying to step of a breakpoint. Turns out that we're
+ also on an instruction that needs to be stepped multiple
+ times before it's been fully executing. E.g., architectures
+ with a delay slot. It needs to be stepped twice, once for
+ the instruction and once for the delay slot. */
+ int step_through_delay
+ = gdbarch_single_step_through_delay (current_gdbarch,
+ get_current_frame ());
+ if (debug_infrun && step_through_delay)
+ fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n");
+ if (step_range_end == 0 && step_through_delay)
+ {
+ /* The user issued a continue when stopped at a breakpoint.
+ Set up for another trap and get out of here. */
+ ecs->another_trap = 1;
+ keep_going (ecs);
+ return;
+ }
+ else if (step_through_delay)
+ {
+ /* The user issued a step when stopped at a breakpoint.
+ Maybe we should stop, maybe we should not - the delay
+ slot *might* correspond to a line of source. In any
+ case, don't decide that here, just set ecs->another_trap,
+ making sure we single-step again before breakpoints are
+ re-inserted. */
+ ecs->another_trap = 1;
+ }
+ }
+
/* Look at the cause of the stop, and decide what to do.
The alternatives are:
1) break; to really stop and return to the debugger,
@@ -1932,6 +1976,8 @@ handle_inferior_event (struct execution_
See more comments in inferior.h. */
if (stop_soon == STOP_QUIETLY_NO_SIGSTOP)
{
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n");
stop_stepping (ecs);
if (stop_signal == TARGET_SIGNAL_STOP)
stop_signal = TARGET_SIGNAL_0;
Index: gdb-6.7.1/gdb/breakpoint.c
===================================================================
--- gdb-6.7.1.orig/gdb/breakpoint.c 2007-11-02 15:21:45.000000000 +0100
+++ gdb-6.7.1/gdb/breakpoint.c 2007-11-02 15:23:04.000000000 +0100
@@ -813,6 +813,90 @@ insert_catchpoint (struct ui_out *uo, vo
}
}
+/* External function to insert all existing watchpoints on a newly
+ attached thread. IWPFN is a callback function to perform
+ the target insert watchpoint. This function is used to support
+ platforms where a watchpoint must be inserted/removed on each
+ individual thread (e.g. ia64-linux and s390-linux). For
+ ia64 and s390 linux, this function is called via a new thread
+ observer. */
+int
+insert_watchpoints_for_new_thread (ptid_t new_thread,
+ insert_watchpoint_ftype *iwpfn)
+{
+ struct bp_location *b;
+ int val = 0;
+ int return_val = 0;
+ struct ui_file *tmp_error_stream = mem_fileopen ();
+ make_cleanup_ui_file_delete (tmp_error_stream);
+
+ /* Explicitly mark the warning -- this will only be printed if
+ there was an error. */
+ fprintf_unfiltered (tmp_error_stream, "Warning:\n");
+
+ ALL_BP_LOCATIONS (b)
+ {
+ /* Skip disabled breakpoints. */
+ if (!breakpoint_enabled (b->owner))
+ continue;
+
+ /* For every active watchpoint, we need to insert the watchpoint on
+ the new thread. */
+ if (b->loc_type == bp_loc_hardware_watchpoint)
+ {
+ struct value *v = b->owner->val_chain;
+
+ /* Look at each value on the value chain. */
+ for (; v; v = v->next)
+ {
+ /* If it's a memory location, and GDB actually needed
+ its contents to evaluate the expression, then we
+ must watch it. */
+ if (VALUE_LVAL (v) == lval_memory
+ && ! VALUE_LAZY (v))
+ {
+ struct type *vtype = check_typedef (VALUE_TYPE (v));
+
+ /* We only watch structs and arrays if user asked
+ for it explicitly, never if they just happen to
+ appear in the middle of some value chain. */
+ if (v == b->owner->val_chain
+ || (TYPE_CODE (vtype) != TYPE_CODE_STRUCT
+ && TYPE_CODE (vtype) != TYPE_CODE_ARRAY))
+ {
+ CORE_ADDR addr;
+ int len, type;
+
+ addr = VALUE_ADDRESS (v) + VALUE_OFFSET (v);
+ len = TYPE_LENGTH (VALUE_TYPE (v));
+ type = hw_write;
+ if (b->owner->type == bp_read_watchpoint)
+ type = hw_read;
+ else if (b->owner->type == bp_access_watchpoint)
+ type = hw_access;
+ val = (*iwpfn) (new_thread, addr, len, type);
+ }
+ }
+ }
+ }
+
+ if (val)
+ return_val = val;
+ }
+
+ /* Failure to insert a watchpoint on any memory value in the
+ value chain brings us here. */
+ if (return_val)
+ {
+ fprintf_unfiltered (tmp_error_stream,
+ "%s\n",
+ "Could not insert hardware watchpoints on new thread.");
+ target_terminal_ours_for_output ();
+ error_stream (tmp_error_stream);
+ }
+ return return_val;
+}
+
/* Helper routine: free the value chain for a breakpoint (watchpoint). */
static void
@@ -1301,6 +1385,7 @@ remove_breakpoints (void)
{
struct bp_location *b;
int val;
+ int return_val = 0;
ALL_BP_LOCATIONS (b)
{
@@ -1308,10 +1393,10 @@ remove_breakpoints (void)
{
val = remove_breakpoint (b, mark_uninserted);
if (val != 0)
- return val;
+ return_val = val;
}
}
- return 0;
+ return return_val;
}
int
@@ -2200,8 +2285,13 @@ print_it_typical (bpstat bs)
break;
case bp_thread_event:
- /* Not sure how we will get here.
- GDB should not stop for these breakpoints. */
+ /* We can only get here legitimately if something further on the bs
+ list has caused the stop status to be noisy. A valid example
+ of this is a new thread event and a software watchpoint have
+ both occurred. */
+ if (bs->next)
+ return PRINT_UNKNOWN;
+
printf_filtered (_("Thread Event Breakpoint: gdb should not stop!\n"));
return PRINT_NOTHING;
break;
@@ -2654,6 +2744,54 @@ which its expression is valid.\n");
}
}
+/* Check watchpoints for a match with a stopped data address.
+
+ STOPPED_DATA_ADDRESS is the address of a triggered watchpoint.
+ A match with an existing watchpoint will cause that watchpoint
+ to be marked as triggered.
+
+ This function is only used for platforms where a watchpoint
+ triggers prior to the data being accessed. */
+
+void
+mark_triggered_watchpoints (CORE_ADDR stopped_data_address)
+{
+ struct breakpoint *b, *temp;
+ CORE_ADDR addr = stopped_data_address;
+ struct value *v;
+
+ ALL_BREAKPOINTS_SAFE (b, temp)
+ {
+ if (b->type == bp_hardware_watchpoint
+ || b->type == bp_read_watchpoint
+ || b->type == bp_access_watchpoint)
+ {
+ for (v = b->val_chain; v; v = v->next)
+ {
+ if (VALUE_LVAL (v) == lval_memory
+ && ! VALUE_LAZY (v))
+ {
+ struct type *vtype = check_typedef (VALUE_TYPE (v));
+
+ if (v == b->val_chain
+ || (TYPE_CODE (vtype) != TYPE_CODE_STRUCT
+ && TYPE_CODE (vtype) != TYPE_CODE_ARRAY))
+ {
+ CORE_ADDR vaddr;
+
+ vaddr = VALUE_ADDRESS (v) + VALUE_OFFSET (v);
+ /* Exact match not required. Within range is
+ sufficient. */
+ if (addr >= vaddr &&
+ addr < vaddr + TYPE_LENGTH (VALUE_TYPE (v)))
+ b->watchpoint_triggered = 1;
+ }
+ }
+ }
+ }
+ }
+}
+
/* Get a bpstat associated with having just stopped at address
BP_ADDR in thread PTID. STOPPED_BY_WATCHPOINT is 1 if the
target thinks we stopped due to a hardware watchpoint, 0 if we
@@ -2787,82 +2925,61 @@ bpstat_stop_status (CORE_ADDR bp_addr, p
bs->stop = 1;
bs->print = 1;
- if (b->type == bp_watchpoint ||
- b->type == bp_hardware_watchpoint)
- {
- char *message = xstrprintf ("Error evaluating expression for watchpoint %d\n",
- b->number);
- struct cleanup *cleanups = make_cleanup (xfree, message);
- int e = catch_errors (watchpoint_check, bs, message,
- RETURN_MASK_ALL);
- do_cleanups (cleanups);
- switch (e)
- {
- case WP_DELETED:
- /* We've already printed what needs to be printed. */
- /* Actually this is superfluous, because by the time we
- call print_it_typical() the wp will be already deleted,
- and the function will return immediately. */
- bs->print_it = print_it_done;
- /* Stop. */
- break;
- case WP_VALUE_CHANGED:
- /* Stop. */
- ++(b->hit_count);
- break;
- case WP_VALUE_NOT_CHANGED:
- /* Don't stop. */
- bs->print_it = print_it_noop;
- bs->stop = 0;
- continue;
- default:
- /* Can't happen. */
- /* FALLTHROUGH */
- case 0:
- /* Error from catch_errors. */
- printf_filtered (_("Watchpoint %d deleted.\n"), b->number);
- if (b->related_breakpoint)
- b->related_breakpoint->disposition = disp_del_at_next_stop;
- b->disposition = disp_del_at_next_stop;
- /* We've already printed what needs to be printed. */
- bs->print_it = print_it_done;
-
- /* Stop. */
- break;
- }
- }
- else if (b->type == bp_read_watchpoint ||
- b->type == bp_access_watchpoint)
+ if (b->type == bp_watchpoint
+ || b->type == bp_read_watchpoint
+ || b->type == bp_access_watchpoint
+ || b->type == bp_hardware_watchpoint)
{
CORE_ADDR addr;
struct value *v;
- int found = 0;
+ int must_check_value = 0;
- if (!target_stopped_data_address (&current_target, &addr))
- continue;
- for (v = b->val_chain; v; v = value_next (v))
+ if (b->type == bp_watchpoint
+ || b->watchpoint_triggered
+ || (b->type == bp_hardware_watchpoint
+ && !target_stopped_data_address_p (&current_target)))
{
- if (VALUE_LVAL (v) == lval_memory
- && ! value_lazy (v))
+ /* We either have a software watchpoint, a triggered watchpoint
+ which we have stepped over, or we cannot ascertain what data
+ address causes a write watchpoint. In all these
+ cases, we must check the watchpoint value. */
+ b->watchpoint_triggered = 0;
+ must_check_value = 1;
+ }
+ else
+ {
+ /* At this point, we know target_stopped_data_address () works or
+ we have a read or access watchpoint and have no alternatives. */
+ if (!target_stopped_data_address (&current_target, &addr))
{
- struct type *vtype = check_typedef (value_type (v));
-
- if (v == b->val_chain
- || (TYPE_CODE (vtype) != TYPE_CODE_STRUCT
- && TYPE_CODE (vtype) != TYPE_CODE_ARRAY))
+ bs->print_it = print_it_noop;
+ bs->stop = 0;
+ continue;
+ }
+ for (v = b->val_chain; v; v = v->next)
+ {
+ if (VALUE_LVAL (v) == lval_memory
+ && ! VALUE_LAZY (v))
{
- CORE_ADDR vaddr;
-
- vaddr = VALUE_ADDRESS (v) + value_offset (v);
- /* Exact match not required. Within range is
- sufficient. */
- if (addr >= vaddr &&
- addr < vaddr + TYPE_LENGTH (value_type (v)))
- found = 1;
+ struct type *vtype = check_typedef (VALUE_TYPE (v));
+
+ if (v == b->val_chain
+ || (TYPE_CODE (vtype) != TYPE_CODE_STRUCT
+ && TYPE_CODE (vtype) != TYPE_CODE_ARRAY))
+ {
+ CORE_ADDR vaddr;
+
+ vaddr = VALUE_ADDRESS (v) + VALUE_OFFSET (v);
+ /* Exact match not required. Within range is
+ sufficient. */
+ if (addr >= vaddr &&
+ addr < vaddr + TYPE_LENGTH (VALUE_TYPE (v)))
+ must_check_value = 1;
+ }
}
}
}
- if (found)
+ if (must_check_value)
{
char *message = xstrprintf ("Error evaluating expression for watchpoint %d\n",
b->number);
@@ -2891,6 +3008,15 @@ bpstat_stop_status (CORE_ADDR bp_addr, p
break;
case WP_VALUE_NOT_CHANGED:
/* Stop. */
+ if (b->type == bp_hardware_watchpoint
+ || b->type == bp_watchpoint)
+ {
+ /* Don't stop: write watchpoints shouldn't fire if
+ the value hasn't changed. */
+ bs->print_it = print_it_noop;
+ bs->stop = 0;
+ continue;
+ }
++(b->hit_count);
break;
default:
@@ -2906,7 +3032,7 @@ bpstat_stop_status (CORE_ADDR bp_addr, p
break;
}
}
- else /* found == 0 */
+ else /* must_check_value == 0 */
{
/* This is a case where some watchpoint(s) triggered,
but not at the address of this watchpoint (FOUND
@@ -4292,6 +4418,7 @@ set_raw_breakpoint_without_location (enu
b->exec_pathname = NULL;
b->ops = NULL;
b->condition_not_parsed = 0;
+ b->watchpoint_triggered = 0;
/* Add this breakpoint to the end of the chain
so that a list of breakpoints will come out in order
Index: gdb-6.7.1/gdb/breakpoint.h
===================================================================
--- gdb-6.7.1.orig/gdb/breakpoint.h 2007-11-02 15:21:45.000000000 +0100
+++ gdb-6.7.1/gdb/breakpoint.h 2007-11-02 15:22:24.000000000 +0100
@@ -439,6 +439,11 @@ struct breakpoint
no location initially so had no context to parse
the condition in. */
int condition_not_parsed;
+
+ /* Has a watchpoint been triggered? This is only used for
+ non-continuable watchpoints which trigger prior to the data
+ being modified. */
+ int watchpoint_triggered;
};
/* The following stuff is an abstract data type "bpstat" ("breakpoint
@@ -707,6 +712,14 @@ extern void tbreak_command (char *, int)
extern int insert_breakpoints (void);
+/* The following provides a callback mechanism to insert watchpoints
+ for a new thread. This is needed, for example, on ia64 linux. */
+typedef int (insert_watchpoint_ftype) (ptid_t, CORE_ADDR, int, int);
+extern int insert_watchpoints_for_new_thread (ptid_t ptid,
+ insert_watchpoint_ftype *fn);
+
+extern void mark_triggered_watchpoints (CORE_ADDR);
+
extern int remove_breakpoints (void);
/* This function can be used to physically insert eventpoints from the
Index: gdb-6.7.1/gdb/linux-nat.c
===================================================================
--- gdb-6.7.1.orig/gdb/linux-nat.c 2007-11-02 15:21:46.000000000 +0100
+++ gdb-6.7.1/gdb/linux-nat.c 2007-11-02 15:21:57.000000000 +0100
@@ -34,6 +34,7 @@
#include "gdbthread.h"
#include "gdbcmd.h"
#include "regcache.h"
+#include "observer.h"
#include "regset.h"
#include "inf-ptrace.h"
#include "auxv.h"
@@ -704,6 +705,9 @@ delete_lwp (ptid_t ptid)
else
lwp_list = lp->next;
+ if (lp->saved_trap_data)
+ xfree (lp->saved_trap_data);
+
xfree (lp);
}
@@ -1501,6 +1505,13 @@ stop_wait_callback (struct lwp_info *lp,
user will delete or disable the breakpoint, but the
thread will have already tripped on it. */
+ /* Notify any observers that we have a SIGTRAP.
+ This is needed on platforms that must save more state
+ than just the trap. For example, ia64 linux uses
+ siginfo to determine if a watchpoint has occurred and
+ this information gets trashed by a SIGSTOP. */
+ observer_notify_sigtrap (lp);
+
/* Now resume this LWP and get the SIGSTOP event. */
errno = 0;
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
@@ -2061,6 +2072,14 @@ retry:
target_pid_to_str (lp->ptid));
}
+ /* For platforms such as ia64, a hardware watchpoint is
+ determined by looking at special information available
+ at the time time of the trap (siginfo). This information
+ is not preserved if we choose to take an event on another
+ thread and later come back to this event, thus we must
+ notify an observer so the information can be stored. */
+ observer_notify_sigtrap (lp);
+
/* Handle GNU/Linux's extended waitstatus for trace events. */
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
{
Index: gdb-6.7.1/gdb/linux-nat.h
===================================================================
--- gdb-6.7.1.orig/gdb/linux-nat.h 2007-11-02 15:21:46.000000000 +0100
+++ gdb-6.7.1/gdb/linux-nat.h 2007-11-02 15:21:57.000000000 +0100
@@ -61,6 +61,18 @@ struct lwp_info
/* Next LWP in list. */
struct lwp_info *next;
+
+ /* Optional saved trap state for when a trap gets pushed back
+ due to multiple events occurring at the same time. */
+ void *saved_trap_data;
+};
+
+/* Watchpoint description. */
+struct linux_watchpoint
+{
+ CORE_ADDR addr;
+ int len;
+ int type;
};
/* Attempt to initialize libthread_db. */
Index: gdb-6.7.1/gdb/Makefile.in
===================================================================
--- gdb-6.7.1.orig/gdb/Makefile.in 2007-09-05 02:14:02.000000000 +0200
+++ gdb-6.7.1/gdb/Makefile.in 2007-11-02 15:21:57.000000000 +0100
@@ -2160,7 +2160,7 @@ i387-tdep.o: i387-tdep.c $(defs_h) $(dou
$(gdb_assert_h) $(gdb_string_h) $(i386_tdep_h) $(i387_tdep_h)
ia64-linux-nat.o: ia64-linux-nat.c $(defs_h) $(gdb_string_h) $(inferior_h) \
$(target_h) $(gdbcore_h) $(regcache_h) $(ia64_tdep_h) $(gdb_wait_h) \
- $(gregset_h) $(linux_nat_h)
+ $(gregset_h) $(observer_h) $(linux_nat_h)
ia64-linux-tdep.o: ia64-linux-tdep.c $(defs_h) $(ia64_tdep_h) \
$(arch_utils_h) $(gdbcore_h) $(regcache_h) $(osabi_h) $(solib_svr4_h) \
$(symtab_h)
@@ -2541,7 +2541,7 @@ rs6000-tdep.o: rs6000-tdep.c $(defs_h) $
rs6000-aix-tdep.o: rs6000-aix-tdep.c $(defs_h) $(gdb_string_h) $(osabi_h) \
$(regcache_h) $(regset_h) $(rs6000_tdep_h) $(ppc_tdep_h)
s390-nat.o: s390-nat.c $(defs_h) $(regcache_h) $(inferior_h) \
- $(s390_tdep_h) $(target_h) $(linux_nat_h)
+ $(s390_tdep_h) $(target_h) $(linux_nat_h) $(observer_h)
s390-tdep.o: s390-tdep.c $(defs_h) $(arch_utils_h) $(frame_h) $(inferior_h) \
$(symtab_h) $(target_h) $(gdbcore_h) $(gdbcmd_h) $(objfiles_h) \
$(floatformat_h) $(regcache_h) $(trad_frame_h) $(frame_base_h) \
Index: gdb-6.7.1/gdb/linux-thread-db.c
===================================================================
--- gdb-6.7.1.orig/gdb/linux-thread-db.c 2007-08-23 20:08:35.000000000 +0200
+++ gdb-6.7.1/gdb/linux-thread-db.c 2007-11-02 15:21:57.000000000 +0100
@@ -34,6 +34,7 @@
#include "target.h"
#include "regcache.h"
#include "solib-svr4.h"
+#include "observer.h"
#include "gdbcore.h"
#include "observer.h"
#include "linux-nat.h"
@@ -673,6 +674,7 @@ attach_thread (ptid_t ptid, const td_thr
{
struct thread_info *tp;
td_err_e err;
+ ptid_t new_ptid;
/* If we're being called after a TD_CREATE event, we may already
know about this thread. There are two ways this can happen. We
@@ -700,8 +702,10 @@ attach_thread (ptid_t ptid, const td_thr
if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE)
return; /* A zombie thread -- do not attach. */
+ new_ptid = BUILD_LWP (ti_p->ti_lid, GET_PID (ptid));
+
/* Under GNU/Linux, we have to attach to each and every thread. */
- if (lin_lwp_attach_lwp (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0) < 0)
+ if (lin_lwp_attach_lwp (new_ptid, 0) < 0)
return;
/* Add the thread to GDB's thread list. */
@@ -712,6 +716,11 @@ attach_thread (ptid_t ptid, const td_thr
if (verbose)
printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid));
+ /* Notify any observers of a new linux thread. This
+ would include any linux platforms that have to insert hardware
+ watchpoints on every thread. */
+ observer_notify_linux_new_thread (new_ptid);
+
/* Enable thread event reporting for this thread. */
err = td_thr_event_enable_p (th_p, 1);
if (err != TD_OK)
@@ -891,7 +900,8 @@ thread_db_wait (ptid_t ptid, struct targ
thread_db_find_new_threads ();
if (ourstatus->kind == TARGET_WAITKIND_STOPPED
- && ourstatus->value.sig == TARGET_SIGNAL_TRAP)
+ && (ourstatus->value.sig == TARGET_SIGNAL_TRAP
+ || ourstatus->value.sig == TARGET_SIGNAL_ILL))
/* Check for a thread event. */
check_event (ptid);
Index: gdb-6.7.1/gdb/i386-linux-nat.c
===================================================================
--- gdb-6.7.1.orig/gdb/i386-linux-nat.c 2007-08-23 20:08:34.000000000 +0200
+++ gdb-6.7.1/gdb/i386-linux-nat.c 2007-11-02 15:21:57.000000000 +0100
@@ -585,10 +585,9 @@ i386_linux_dr_get (int regnum)
int tid;
unsigned long value;
- /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
- multi-threaded processes here. For now, pretend there is just
- one thread. */
- tid = PIDGET (inferior_ptid);
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid);
/* FIXME: kettenis/2001-03-27: Calling perror_with_name if the
ptrace call fails breaks debugging remote targets. The correct
@@ -613,10 +612,9 @@ i386_linux_dr_set (int regnum, unsigned
{
int tid;
- /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
- multi-threaded processes here. For now, pretend there is just
- one thread. */
- tid = PIDGET (inferior_ptid);
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid);
errno = 0;
ptrace (PTRACE_POKEUSER, tid,
Index: gdb-6.7.1/gdb/ia64-linux-nat.c
===================================================================
--- gdb-6.7.1.orig/gdb/ia64-linux-nat.c 2007-08-23 20:08:35.000000000 +0200
+++ gdb-6.7.1/gdb/ia64-linux-nat.c 2007-11-02 15:21:57.000000000 +0100
@@ -27,6 +27,7 @@
#include "regcache.h"
#include "ia64-tdep.h"
#include "linux-nat.h"
+#include "observer.h"
#include <signal.h>
#include <sys/ptrace.h>
@@ -550,10 +551,10 @@ is_power_of_2 (int val)
return onecount <= 1;
}
+/* Internal routine to insert one watchpoint for a specified thread. */
static int
-ia64_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw)
+ia64_linux_insert_one_watchpoint (ptid_t ptid, CORE_ADDR addr, int len, int rw)
{
- ptid_t ptid = inferior_ptid;
int idx;
long dbr_addr, dbr_mask;
int max_watchpoints = 4;
@@ -598,10 +599,39 @@ ia64_linux_insert_watchpoint (CORE_ADDR
return 0;
}
+/* Internal callback routine which can be used via iterate_over_lwps
+ to insert a specific watchpoint from all active threads. */
static int
-ia64_linux_remove_watchpoint (CORE_ADDR addr, int len, int type)
+ia64_linux_insert_watchpoint_callback (struct lwp_info *lwp, void *data)
+{
+ struct linux_watchpoint *args = (struct linux_watchpoint *)data;
+
+ return ia64_linux_insert_one_watchpoint (lwp->ptid, args->addr,
+ args->len, args->type);
+}
+
+/* Insert a watchpoint for all threads. */
+static int
+ia64_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw)
+{
+ struct linux_watchpoint args;
+
+ args.addr = addr;
+ args.len = len;
+ args.type = rw;
+
+ /* For ia64, watchpoints must be inserted/removed on each thread so
+ we iterate over the lwp list. */
+ if (iterate_over_lwps (&ia64_linux_insert_watchpoint_callback, &args))
+ return -1;
+
+ return 0;
+}
+
+/* Internal routine to remove one watchpoint for a specified thread. */
+static int
+ia64_linux_remove_one_watchpoint (ptid_t ptid, CORE_ADDR addr, int len, int type)
{
- ptid_t ptid = inferior_ptid;
int idx;
long dbr_addr, dbr_mask;
int max_watchpoints = 4;
@@ -623,13 +653,55 @@ ia64_linux_remove_watchpoint (CORE_ADDR
return -1;
}
+/* Internal callback routine which can be used via iterate_over_lwps
+ to remove a specific watchpoint from all active threads. */
+static int
+ia64_linux_remove_watchpoint_callback (struct lwp_info *lwp, void *data)
+{
+ struct linux_watchpoint *args = (struct linux_watchpoint *)data;
+
+ return ia64_linux_remove_one_watchpoint (lwp->ptid, args->addr,
+ args->len);
+}
+
+/* Remove a watchpoint for all threads. */
+static int
+ia64_linux_remove_watchpoint (CORE_ADDR addr, int len)
+{
+ struct linux_watchpoint args;
+
+ args.addr = addr;
+ args.len = len;
+
+ /* For ia64, watchpoints must be inserted/removed on each thread so
+ we iterate over the lwp list. */
+ if (iterate_over_lwps (&ia64_linux_remove_watchpoint_callback, &args))
+ return -1;
+
+ return 0;
+}
+
+/* Callback to find lwp_info struct for a given lwp. */
+static int
+find_lwp_info (struct lwp_info *lp, void *data)
+{
+ int lwp = *(int *)data;
+
+ if (lwp == TIDGET (lp->ptid))
+ return 1;
+
+ return 0;
+}
+
static int
ia64_linux_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p)
{
CORE_ADDR psr;
int tid;
struct siginfo siginfo;
+ struct siginfo *siginfo_p;
ptid_t ptid = inferior_ptid;
+ struct lwp_info *lp;
struct regcache *regcache = get_current_regcache ();
tid = TIDGET(ptid);
@@ -637,10 +709,19 @@ ia64_linux_stopped_data_address (struct
tid = PIDGET (ptid);
errno = 0;
- ptrace (PTRACE_GETSIGINFO, tid, (PTRACE_TYPE_ARG3) 0, &siginfo);
+ /* Check to see if we have already cached the siginfo for this
+ event. */
+ lp = iterate_over_lwps (find_lwp_info, &tid);
+ if (lp && lp->saved_trap_data != NULL)
+ siginfo_p = (struct siginfo *)lp->saved_trap_data;
+ else
+ {
+ siginfo_p = &siginfo;
+ ptrace (PTRACE_GETSIGINFO, tid, (PTRACE_TYPE_ARG3) 0, siginfo_p);
+ }
- if (errno != 0 || siginfo.si_signo != SIGTRAP ||
- (siginfo.si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */)
+ if (errno != 0 || siginfo_p->si_signo != SIGTRAP ||
+ (siginfo_p->si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */)
return 0;
regcache_cooked_read_unsigned (regcache, IA64_PSR_REGNUM, &psr);
@@ -648,7 +729,7 @@ ia64_linux_stopped_data_address (struct
for the next instruction */
regcache_cooked_write_unsigned (regcache, IA64_PSR_REGNUM, psr);
- *addr_p = (CORE_ADDR)siginfo.si_addr;
+ *addr_p = (CORE_ADDR)siginfo_p->si_addr;
return 1;
}
@@ -796,6 +877,31 @@ ia64_linux_xfer_partial (struct target_o
offset, len);
}
+/* Observer function for a new thread attach. We need to insert
+ existing watchpoints on the new thread. */
+static void
+ia64_linux_new_thread (ptid_t ptid)
+{
+ insert_watchpoints_for_new_thread (ptid,
+ &ia64_linux_insert_one_watchpoint);
+}
+
+/* For ia64 linux, we must save the siginfo data as part of the state
+ of a queued SIGTRAP. This is because siginfo is used to determine
+ if a watchpoint has occurred and the information will be lost if
+ a SIGSTOP is issued to the thread. */
+void
+ia64_linux_save_sigtrap_info (void *queue_data)
+{
+ struct lwp_info *lp = (struct lwp_info *)queue_data;
+
+ if (lp->saved_trap_data == NULL)
+ lp->saved_trap_data = xmalloc (sizeof(struct siginfo));
+
+ ptrace (PTRACE_GETSIGINFO, ptid_get_lwp (lp->ptid), (PTRACE_ARG3_TYPE) 0,
+ lp->saved_trap_data);
+}
+
void _initialize_ia64_linux_nat (void);
void
@@ -834,4 +940,7 @@ _initialize_ia64_linux_nat (void)
/* Register the target. */
linux_nat_add_target (t);
+
+ observer_attach_linux_new_thread (ia64_linux_new_thread);
+ observer_attach_sigtrap (ia64_linux_save_sigtrap_info);
}
Index: gdb-6.7.1/gdb/amd64-linux-nat.c
===================================================================
--- gdb-6.7.1.orig/gdb/amd64-linux-nat.c 2007-08-23 20:08:26.000000000 +0200
+++ gdb-6.7.1/gdb/amd64-linux-nat.c 2007-11-02 15:21:57.000000000 +0100
@@ -240,10 +240,9 @@ amd64_linux_dr_get (int regnum)
int tid;
unsigned long value;
- /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
- multi-threaded processes here. For now, pretend there is just
- one thread. */
- tid = PIDGET (inferior_ptid);
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid);
/* FIXME: kettenis/2001-03-27: Calling perror_with_name if the
ptrace call fails breaks debugging remote targets. The correct
@@ -268,10 +267,9 @@ amd64_linux_dr_set (int regnum, unsigned
{
int tid;
- /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
- multi-threaded processes here. For now, pretend there is just
- one thread. */
- tid = PIDGET (inferior_ptid);
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid);
errno = 0;
ptrace (PT_WRITE_U, tid, offsetof (struct user, u_debugreg[regnum]), value);
Index: gdb-6.7.1/gdb/s390-nat.c
===================================================================
--- gdb-6.7.1.orig/gdb/s390-nat.c 2007-08-23 20:08:37.000000000 +0200
+++ gdb-6.7.1/gdb/s390-nat.c 2007-11-02 15:21:57.000000000 +0100
@@ -27,6 +27,7 @@
#include "linux-nat.h"
#include "s390-tdep.h"
+#include "observer.h"
#include <asm/ptrace.h>
#include <sys/ptrace.h>
@@ -111,14 +112,14 @@ fill_fpregset (const struct regcache *re
(char *)regp + regmap_fpregset[i]);
}
-/* Find the TID for the current inferior thread to use with ptrace. */
+/* Find the TID for use with ptrace. */
static int
-s390_inferior_tid (void)
+s390_tid (ptid_t ptid)
{
/* GNU/Linux LWP ID's are process ID's. */
- int tid = TIDGET (inferior_ptid);
+ int tid = TIDGET (ptid);
if (tid == 0)
- tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+ tid = PIDGET (ptid); /* Not a threaded program. */
return tid;
}
@@ -202,7 +203,7 @@ store_fpregs (const struct regcache *reg
static void
s390_linux_fetch_inferior_registers (struct regcache *regcache, int regnum)
{
- int tid = s390_inferior_tid ();
+ int tid = s390_tid (inferior_ptid);
if (regnum == -1
|| (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1))
@@ -218,7 +219,7 @@ s390_linux_fetch_inferior_registers (str
static void
s390_linux_store_inferior_registers (struct regcache *regcache, int regnum)
{
- int tid = s390_inferior_tid ();
+ int tid = s390_tid (inferior_ptid);
if (regnum == -1
|| (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1))
@@ -260,7 +261,7 @@ s390_stopped_by_watchpoint (void)
parea.len = sizeof (per_lowcore);
parea.process_addr = (addr_t) & per_lowcore;
parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore);
- if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea) < 0)
+ if (ptrace (PTRACE_PEEKUSR_AREA, s390_tid (inferior_ptid), &parea) < 0)
perror_with_name (_("Couldn't retrieve watchpoint status"));
return per_lowcore.perc_storage_alteration == 1
@@ -268,9 +269,9 @@ s390_stopped_by_watchpoint (void)
}
static void
-s390_fix_watch_points (void)
+s390_fix_watch_points (ptid_t ptid)
{
- int tid = s390_inferior_tid ();
+ int tid = s390_tid (ptid);
per_struct per_info;
ptrace_area parea;
@@ -307,6 +308,16 @@ s390_fix_watch_points (void)
perror_with_name (_("Couldn't modify watchpoint status"));
}
+/* Callback routine to use with iterate_over_lwps to insert a specified
+ watchpoint on all threads. */
+static int
+s390_insert_watchpoint_callback (struct lwp_info *lwp, void *data)
+{
+ s390_fix_watch_points (lwp->ptid);
+ return 0;
+}
+
+/* Insert a specified watchpoint on all threads. */
static int
s390_insert_watchpoint (CORE_ADDR addr, int len, int type)
{
@@ -320,10 +331,24 @@ s390_insert_watchpoint (CORE_ADDR addr,
area->next = watch_base;
watch_base = area;
- s390_fix_watch_points ();
+ /* For the S390, a watchpoint must be inserted/removed for each
+ thread so we iterate over the list of existing lwps. */
+ if (iterate_over_lwps (&s390_insert_watchpoint_callback, NULL))
+ return -1;
+
return 0;
}
+/* Callback routine to use with iterate_over_lwps to remove a specified
+ watchpoint from all threads. */
+static int
+s390_remove_watchpoint_callback (struct lwp_info *lwp, void *data)
+{
+ s390_fix_watch_points (lwp->ptid);
+ return 0;
+}
+
+/* Remove a specified watchpoint from all threads. */
static int
s390_remove_watchpoint (CORE_ADDR addr, int len, int type)
{
@@ -345,7 +370,11 @@ s390_remove_watchpoint (CORE_ADDR addr,
*parea = area->next;
xfree (area);
- s390_fix_watch_points ();
+ /* For the S390, a watchpoint must be inserted/removed for each
+ thread so we iterate over the list of existing lwps. */
+ if (iterate_over_lwps (&s390_remove_watchpoint_callback, NULL))
+ return -1;
+
return 0;
}
@@ -361,6 +390,15 @@ s390_region_ok_for_hw_watchpoint (CORE_A
return 1;
}
+/* New thread observer that inserts all existing watchpoints on the
+ new thread. */
+static void
+s390_linux_new_thread (ptid_t ptid)
+{
+ /* Add existing watchpoints to new thread. */
+ s390_fix_watch_points (ptid);
+}
+
void _initialize_s390_nat (void);
@@ -386,4 +424,6 @@ _initialize_s390_nat (void)
/* Register the target. */
linux_nat_add_target (t);
+
+ observer_attach_linux_new_thread (s390_linux_new_thread);
}
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