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cygwin breakpoints fail under Cygwin
- From: Duane Ellis <duane at duaneellis dot com>
- To: gdb at sourceware dot org
- Date: Fri, 29 Aug 2008 23:31:00 -0400
- Subject: cygwin breakpoints fail under Cygwin
Not sure if this should be on the cygwin list, or the gdb list. I'll try
here first because it is gdb specific.
Short description: GDB breakpoints are failing with Cygwin.
1) Fresh install of cygwin (I blew away my old install from 2005) - and
reinstalled everything about 2 hours ago.
2) I run GDB against an application, then RUN.
3) Control-C to get the GDB prompt.
App I am debugging is a cygwin build of "openocd"
FYI openocd is the embedded jtag debug tool used with GDB.
4) I set a breakpoint at a function, in this case "target_configure"
5) I type "cont" to continue.
One of two things happen:
(A) either the program continues ... the good thing.
If (A) happens, I can debug, my breakpoint works.
(B) Immediately after pressing "ENTER"
I get this message: "Program received signal SIGINT, Interrupt."
In case (B) no breakpoint I set will ever happen.
I am sort of stuck - and don't know what to try next.
Output showing the example from GDB is below
This worked before with an older version (2005) of GDB - which (as I
said above, I just re-installed cygwin) I no longer have.
GDB version: GNU gdb 18.104.22.16880328-cvs (cygwin-special)
Host system: MS Windows - WinXP Home.
I start "GDB"
$ gdb ./openocd.exe
GNU gdb 22.214.171.12480328-cvs (cygwin-special)
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-pc-cygwin"...
I type "RUN' to run my program with no params.
Starting program: /home/duane/cortex/olimex/openocd.exe
[New thread 3400.0xda4]
[New thread 3400.0xdec]
Open On-Chip Debugger 1.0 (2008-08-29-22:00) svn:exported
$URL: http://svn.berlios.de/svnroot/repos/openocd/trunk/src/openocd.c $
Info: JTAG device found: 0x3f0f0f0f (Manufacturer: 0x787, Part:
0xf0f0, Version: 0x3)
Warning:no tcl port specified, using default port 6666
[New thread 3400.0xb0c]
Warning:DBGACK set while target was in unknown state. Reset or
target state: halted
target halted in ARM state due to breakpoint, current mode: Supervisor
cpsr: 0x00000053 pc: 0x00000038
[New thread 3400.0xdc4]
[Switching to thread 3400.0xdc4]
At this point, I hit Control-C to get the GDB prompt.
(gdb) break target_configure
Breakpoint 1 at 0x40c060: file ../../../openocd23/src/target/target.c,
Above I set my breakpoint, and type "cont" to continue my program.
Immediately- this "SIGINT" happens and breakpoints do not work.
Or - SIGINT does not happen, and everything works just fine.
Program received signal SIGINT, Interrupt.
0x7c87534d in KERNEL32!GetConsoleCharType () from
Warning:BUG: keep_alive() was not invoked in the 1000ms timelimit. GDB
alive packet not sent! (28359)
[New thread 3400.0xe48]
[Switching to thread 3400.0xe48]
0x7c810659 in KERNEL32!CreateThread () from