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Mail Archives: cygwin/2007/10/13/21:20:29

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From: =?ISO-8859-1?Q?Ren=E9_Berber?= <r DOT berber AT computer DOT org>
Subject: Re: [gdb] Data watchpoints in Windows weirdness. Call for testers.
Date: Sat, 13 Oct 2007 20:19:40 -0500
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Pedro Alves wrote:

[snip]
> Any change someone does the little testing to make sure I'm not
> having a local problem here?
>=20
> as easy as:
>=20
> gcc main.c -o main.exe -g3 -O0
> gdb main.exe
> start
> watch count
> 'continue' several times, and send me or post here the results.
>=20
> A log with the these on would be nice, but not essencial:
> set debug infrun 1
> set debugevents 1
> set debugexceptions 1
> maint show-debug-regs 1

$ gcc main.c -o main.exe -g3 -O0

rberber AT black /c/tmp
$ gdb main.exe
GNU gdb 6.5.50.20060706-cvs (cygwin-special)
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain condition=
s.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i686-pc-cygwin"...
(gdb) start
Breakpoint 1 at 0x401075: file main.c, line 8.
Starting program: /c/tmp/main.exe
Loaded symbols for /c/WINDOWS/system32/ntdll.dll
Loaded symbols for /c/WINDOWS/system32/kernel32.dll
Loaded symbols for /usr/bin/cygwin1.dll
Loaded symbols for /c/WINDOWS/system32/advapi32.dll
Loaded symbols for /c/WINDOWS/system32/rpcrt4.dll
main ()
    at main.c:8
8	{
(gdb) watch count
Hardware watchpoint 2: count
(gdb) c
Continuing.

Program received signal SIGTRAP, Trace/breakpoint trap.
main () at main.c:11
11	  printf ("count %d\n", count);
(gdb) c
Continuing.

Program received signal SIGTRAP, Trace/breakpoint trap.
main () at main.c:16
16	      printf ("count %d\n", count);
(gdb) p count
$1 =3D 1000
(gdb) c
Continuing.

Program received signal SIGTRAP, Trace/breakpoint trap.
main () at main.c:18
18	      Sleep (1000);
(gdb) p count
$3 =3D 1001
(gdb) c
Continuing.
Hardware watchpoint 2: count

Old value =3D 0
New value =3D 1002
main () at main.c:18
18	      Sleep (1000);
(gdb) c
Continuing.
Hardware watchpoint 2: count

Old value =3D 1002
New value =3D 1003
main () at main.c:18
18	      Sleep (1000);
(gdb) c
Continuing.
Hardware watchpoint 2: count

Old value =3D 1003
New value =3D 1004
main () at main.c:18
18	      Sleep (1000);
(gdb) c
Continuing.
Hardware watchpoint 2: count

Old value =3D 1004
New value =3D 1005
main () at main.c:18
18	      Sleep (1000);
(gdb) c
Continuing.
Hardware watchpoint 2: count

Old value =3D 1005
New value =3D 1006
main () at main.c:18
18	      Sleep (1000);
(gdb) set debug infrun 1
(gdb) set debugevents 1
(gdb) set debugexceptions 1
(gdb) maint show-debug-regs 1
(gdb) c
Continuing.
infrun: proceed (addr=3D0xffffffff, signal=3D144, step=3D0)
insert_watchpoint (addr=3D403010, len=3D4, type=3Ddata-write):
	CONTROL (DR7): 000d0101          STATUS (DR6): ffff0ff1
	DR0: addr=3D0x00403010, ref.count=3D1  DR1: addr=3D0x00000000, ref.count=
=3D0
	DR2: addr=3D0x00000000, ref.count=3D0  DR3: addr=3D0x00000000, ref.count=
=3D0
infrun: resume (step=3D0, signal=3D0)
ContinueDebugEvent (cpid=3D1548, ctid=3D1364, DBG_CONTINUE);
infrun: wait_for_inferior
gdb: kernel event for pid=3D1548 tid=3D1364 code=3DEXCEPTION_DEBUG_EVENT)
gdb: Target exception EXCEPTION_SINGLE_STEP at 0x004010d9
infrun: infwait_normal_state
infrun: TARGET_WAITKIND_STOPPED
infrun: stop_pc =3D 0x4010d9
watchpoint_hit (addr=3D403010, len=3D-1, type=3Ddata-write):
	CONTROL (DR7): 000d0101          STATUS (DR6): ffff0ff1
	DR0: addr=3D0x00403010, ref.count=3D1  DR1: addr=3D0x00000000, ref.count=
=3D0
	DR2: addr=3D0x00000000, ref.count=3D0  DR3: addr=3D0x00000000, ref.count=
=3D0
infrun: BPSTATE_WHAT_STOP_NOISY
infrun: stop_stepping
remove_watchpoint (addr=3D403010, len=3D4, type=3Ddata-write):
	CONTROL (DR7): 000d0100          STATUS (DR6): ffff0ff1
	DR0: addr=3D0x00000000, ref.count=3D0  DR1: addr=3D0x00000000, ref.count=
=3D0
	DR2: addr=3D0x00000000, ref.count=3D0  DR3: addr=3D0x00000000, ref.count=
=3D0
Hardware watchpoint 2: count

Old value =3D 1006
New value =3D 1007
main () at main.c:18
18	      Sleep (1000);
(gdb) c
Continuing.
infrun: proceed (addr=3D0xffffffff, signal=3D144, step=3D0)
insert_watchpoint (addr=3D403010, len=3D4, type=3Ddata-write):
	CONTROL (DR7): 000d0101          STATUS (DR6): ffff0ff1
	DR0: addr=3D0x00403010, ref.count=3D1  DR1: addr=3D0x00000000, ref.count=
=3D0
	DR2: addr=3D0x00000000, ref.count=3D0  DR3: addr=3D0x00000000, ref.count=
=3D0
infrun: resume (step=3D0, signal=3D0)
ContinueDebugEvent (cpid=3D1548, ctid=3D1364, DBG_CONTINUE);
infrun: wait_for_inferior
gdb: kernel event for pid=3D1548 tid=3D1364 code=3DEXCEPTION_DEBUG_EVENT)
gdb: Target exception EXCEPTION_SINGLE_STEP at 0x004010d9
infrun: infwait_normal_state
infrun: TARGET_WAITKIND_STOPPED
infrun: stop_pc =3D 0x4010d9
watchpoint_hit (addr=3D403010, len=3D-1, type=3Ddata-write):
	CONTROL (DR7): 000d0101          STATUS (DR6): ffff0ff1
	DR0: addr=3D0x00403010, ref.count=3D1  DR1: addr=3D0x00000000, ref.count=
=3D0
	DR2: addr=3D0x00000000, ref.count=3D0  DR3: addr=3D0x00000000, ref.count=
=3D0
infrun: BPSTATE_WHAT_STOP_NOISY
infrun: stop_stepping
remove_watchpoint (addr=3D403010, len=3D4, type=3Ddata-write):
	CONTROL (DR7): 000d0100          STATUS (DR6): ffff0ff1
	DR0: addr=3D0x00000000, ref.count=3D0  DR1: addr=3D0x00000000, ref.count=
=3D0
	DR2: addr=3D0x00000000, ref.count=3D0  DR3: addr=3D0x00000000, ref.count=
=3D0
Hardware watchpoint 2: count

Old value =3D 1007
New value =3D 1008
main () at main.c:18
18	      Sleep (1000);
(gdb) c
Continuing.
infrun: proceed (addr=3D0xffffffff, signal=3D144, step=3D0)
insert_watchpoint (addr=3D403010, len=3D4, type=3Ddata-write):
	CONTROL (DR7): 000d0101          STATUS (DR6): ffff0ff1
	DR0: addr=3D0x00403010, ref.count=3D1  DR1: addr=3D0x00000000, ref.count=
=3D0
	DR2: addr=3D0x00000000, ref.count=3D0  DR3: addr=3D0x00000000, ref.count=
=3D0
infrun: resume (step=3D0, signal=3D0)
ContinueDebugEvent (cpid=3D1548, ctid=3D1364, DBG_CONTINUE);
infrun: wait_for_inferior
gdb: kernel event for pid=3D1548 tid=3D1364 code=3DEXCEPTION_DEBUG_EVENT)
gdb: Target exception EXCEPTION_SINGLE_STEP at 0x004010d9
infrun: infwait_normal_state
infrun: TARGET_WAITKIND_STOPPED
infrun: stop_pc =3D 0x4010d9
watchpoint_hit (addr=3D403010, len=3D-1, type=3Ddata-write):
	CONTROL (DR7): 000d0101          STATUS (DR6): ffff0ff1
	DR0: addr=3D0x00403010, ref.count=3D1  DR1: addr=3D0x00000000, ref.count=
=3D0
	DR2: addr=3D0x00000000, ref.count=3D0  DR3: addr=3D0x00000000, ref.count=
=3D0
infrun: BPSTATE_WHAT_STOP_NOISY
infrun: stop_stepping
remove_watchpoint (addr=3D403010, len=3D4, type=3Ddata-write):
	CONTROL (DR7): 000d0100          STATUS (DR6): ffff0ff1
	DR0: addr=3D0x00000000, ref.count=3D0  DR1: addr=3D0x00000000, ref.count=
=3D0
	DR2: addr=3D0x00000000, ref.count=3D0  DR3: addr=3D0x00000000, ref.count=
=3D0
Hardware watchpoint 2: count

Old value =3D 1008
New value =3D 1009
main () at main.c:18
18	      Sleep (1000);
(gdb) c
Continuing.
infrun: proceed (addr=3D0xffffffff, signal=3D144, step=3D0)
insert_watchpoint (addr=3D403010, len=3D4, type=3Ddata-write):
	CONTROL (DR7): 000d0101          STATUS (DR6): ffff0ff1
	DR0: addr=3D0x00403010, ref.count=3D1  DR1: addr=3D0x00000000, ref.count=
=3D0
	DR2: addr=3D0x00000000, ref.count=3D0  DR3: addr=3D0x00000000, ref.count=
=3D0
infrun: resume (step=3D0, signal=3D0)
ContinueDebugEvent (cpid=3D1548, ctid=3D1364, DBG_CONTINUE);
infrun: wait_for_inferior
gdb: kernel event for pid=3D1548 tid=3D1364 code=3DEXCEPTION_DEBUG_EVENT)
gdb: Target exception EXCEPTION_SINGLE_STEP at 0x004010d9
infrun: infwait_normal_state
infrun: TARGET_WAITKIND_STOPPED
infrun: stop_pc =3D 0x4010d9
watchpoint_hit (addr=3D403010, len=3D-1, type=3Ddata-write):
	CONTROL (DR7): 000d0101          STATUS (DR6): ffff0ff1
	DR0: addr=3D0x00403010, ref.count=3D1  DR1: addr=3D0x00000000, ref.count=
=3D0
	DR2: addr=3D0x00000000, ref.count=3D0  DR3: addr=3D0x00000000, ref.count=
=3D0
infrun: BPSTATE_WHAT_STOP_NOISY
infrun: stop_stepping
remove_watchpoint (addr=3D403010, len=3D4, type=3Ddata-write):
	CONTROL (DR7): 000d0100          STATUS (DR6): ffff0ff1
	DR0: addr=3D0x00000000, ref.count=3D0  DR1: addr=3D0x00000000, ref.count=
=3D0
	DR2: addr=3D0x00000000, ref.count=3D0  DR3: addr=3D0x00000000, ref.count=
=3D0
Hardware watchpoint 2: count

Old value =3D 1009
New value =3D 1010
main () at main.c:18
18	      Sleep (1000);
(gdb) ki
Kill the program being debugged? (y or n) y
ContinueDebugEvent (cpid=3D1548, ctid=3D1364, DBG_CONTINUE);
ContinueDebugEvent (cpid=3D1548, ctid=3D1364, DBG_CONTINUE);
ContinueDebugEvent (cpid=3D1548, ctid=3D3808, DBG_CONTINUE);
gdb: win32_close, inferior_ptid=3D1364
(gdb) q

--=20
Ren=E9 Berber


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