[Bug breakpoints/10645] Watchpoints on unreadable memory need no singlestepping

["dragos dot tatulea at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From dragos dot tatulea at gmail dot com  2010-07-26 21:03 -------
This patch: http://sourceware.org/ml/gdb-patches/2009-11/msg00429.html seems to 
change the behavior of watching an invalid area. Here's what happens now: 

GNU gdb (GDB) 7.0.50.20100131-cvs
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
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and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /media/a/gdb/bugzilla/10645/simple...done.
(gdb) start
Temporary breakpoint 1 at 0x400478: file simple.c, line 4.
Starting program: /media/a/gdb/bugzilla/10645/simple 

Temporary breakpoint 1, main () at simple.c:4
4         i = 1;
(gdb) set debug infrun 1
(gdb) watch *p
Hardware watchpoint 2: *p
(gdb) c
Continuing.
infrun: clear_proceed_status_thread (process 13517)
infrun: proceed (addr=0xffffffffffffffff, signal=144, step=0)
infrun: resume (step=0, signal=0), trap_expected=0
infrun: wait_for_inferior (treat_exec_as_sigtrap=0)
infrun: target_wait (-1, status) =
infrun:   13517 [process 13517],
infrun:   status->kind = stopped, signal = SIGTRAP
infrun: infwait_normal_state
infrun: TARGET_WAITKIND_STOPPED
infrun: stop_pc = 0x400498
infrun: stopped by watchpoint
infrun: stopped data address = 0x600840
infrun: BPSTAT_WHAT_STOP_NOISY
infrun: stop_stepping
Hardware watchpoint 2: *p

Old value = <unreadable>
New value = -443987883
main () at simple.c:7
7         return 0;

There's no single stepping anymore (at least for this particular case). Need to 
investigate why.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=10645

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