Questions on cross-gdb

[Danny Backx <danny dot backx at scarlet dot be>]

Hi,

I have a cross-gdb working relatively well between my linux PC and a
i386-mingw32ce (Windows CE Embedded with a x86 clone processor) target.

My questions relate to gdb, not gdbserver. First, the output of "info share".
After setting e.g. solib-search-path, we want it to behave as follows :

(gdb) info share
>From        To          Syms Read   Shared Object Library
                        No          \Windows\iphlpapi.dll
                        No          \Windows\ws2.dll
0x41ee1000  0x41eec1fc
Yes         /opt/x86mingw32ce/bin/libgcc_s_sjlj-1.dll
0x42a11000  0x42ae2990
Yes         /opt/x86mingw32ce/i386-mingw32ce/lib/libstdc++-6.dll
0x41f21000  0x420d9744  Yes         libace.dll
                        No          \Windows\coredll.dll
(gdb)

meaning that the paths with backslashes get treated well. Previous
situation (=bad) was :
(gdb) info share
>From        To          Syms Read   Shared Object Library
                        No          \Windows\iphlpapi.dll
                        No          \Windows\ws2.dll
                        No          \network\x86\ace\libgcc_s_sjlj-1.dll
                        No          \network\x86\ace\libstdc++-6.dll
0x41f21000  0x420d9744  Yes         libace.dll
                        No          \Windows\coredll.dll
(gdb) 

There's support in the code for that (HAVE_DOS_BASED_FILE_SYSTEM), but
it doesn't get enabled in my cross-environment. gdb gets compiled by the
host gcc, which doesn't set stuff like _WIN32. So the
HAVE_DOS_BASED_FILE_SYSTEM never gets defined. This happens both in
gdb/* and in libiberty/* .

Question 1 : where should I hack this ? I would like it to come from
somewhere in the configuration scripts (and I'm now asking where would
be the best place). Another thing to edit is then include/filenames.h
which needs to grab this and do the right thing, instead of just
reacting to _WIN32 and such. But that's a trivial fix.

Question 2 : I occasionally have a problem - see below - setting
breakpoints. A pointer to what might be causing this would be
appreciated so I can chase the bug.

(gdb) break 65
warning: (Internal error: pc 0xd4720040 in read in psymtab, but not in
symtab.)

warning: (Internal error: pc 0xd4720040 in read in psymtab, but not in
symtab.)

warning: (Internal error: pc 0xd4720040 in read in psymtab, but not in
symtab.)

warning: (Internal error: pc 0xd4720040 in read in psymtab, but not in
symtab.)

warning: (Internal error: pc 0xd4720040 in read in psymtab, but not in
symtab.)

warning: (Internal error: pc 0xd4720040 in read in psymtab, but not in
symtab.)

Note: breakpoint 2 also set at pc 0xd4720040.
warning: (Internal error: pc 0xd4720040 in read in psymtab, but not in
symtab.)

Note: breakpoint 2 also set at pc 0xd4720040.
warning: (Internal error: pc 0xd4720040 in read in psymtab, but not in
symtab.)

Breakpoint 2 at 0x408078:
file /home/danny/src/ace/svn.dre.vanderbilt.edu/ACE_wrappers/ace/Singleton.cpp, line 65. (7 locations)
(gdb) c
Continuing.
Warning:
Cannot insert breakpoint 2.
Error accessing memory address 0xd4720040: Input/output error.

(gdb) q
The program is running.  Quit anyway (and kill it)? (y or n) n
Not confirmed.
(gdb) c
Continuing.
Warning:
Cannot insert breakpoint 2.
Error accessing memory address 0xd4720040: Input/output error.

(gdb) del 2
(gdb) where
#0  ACE_Singleton<ACE_Based_Pointer_Repository,
ACE_RW_Thread_Mutex>::instance ()

at /home/danny/src/ace/svn.dre.vanderbilt.edu/ACE_wrappers/ace/Singleton.cpp:62
#1  0x42e8109b in get_based_pointer_repository_instance () at
Based_Pointer_Test_Lib.cpp:36
#2  0x004013c5 in singleton_test () at Based_Pointer_Test.cpp:132
#3  0x0040272e in run_main () at Based_Pointer_Test.cpp:425
#4  0x00401153 in ace_tmain_i (argc=1, argv=0x16023230) at Main.cpp:30
#5  0x004086cc in ACE_Main::run_i (this=0x1601fb50, argc=1,
argv=0x16023230) at Main.cpp:27
#6  0x41f93efd in ACE_Main_Base::run (this=0x1601fb50,
lpCmdLine=0x1601fc70 L"") at OS_main.cpp:146
#7  0x004010c5 in WinMain (hInstance=0x4410022, hPrevInstance=0x0,
lpCmdLine=0x1601fc70 L"", 
    nCmdShow=5) at Main.cpp:27
#8  0x0040103b in WinMainCRTStartup (hInst=0x4410022, hPrevInst=0x0,
lpCmdLine=0x1601fc70 L"", 
    nCmdShow=5)
at /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/mingw/crt3.c:62
(gdb) c
Continuing.

Program exited with code 01.
(gdb) 

Thanks,

	Danny
-- 
Danny Backx ; danny.backx - at - scarlet.be ; http://danny.backx.info