Re: kgdb on arm for 2.6

George Anzinger wrote:

> Lance Spaulding wrote:
>
> > George Anzinger wrote:
> >
> > > Hm... Looks like a gdb bug then.  The trace you did not show is the 
> > > 6.0 gdb on the 2.6 kgdb.  That would be most interesting.  What I am 
> > > seeing below is the 2.4 kgdb is doing the full single step on its 
> > > own.  What I would expect to see the 6.0 gdb on the 2.6 kgdb doing 
> > > is fetching the instruction, doing what ever side effects the 
> > > instruction generates such as changing the PC and registers and, 
> > > possibly memory.
> > >
> > > George
> Hm... Yes, it does not even try to do a hw "s" but just gets to doing 
> the needed breakpoint and so on.  Looks like gdb got dumbed down for 6.2.


Hi again,

Using gdb 6.0 most things are working but I've found that I cannot view 
the state of the cpsr (current program status register).  With the 
current kgdb and 2.6 it always shows 0 whereas with the old kgdb and 
2.4, I see correct values (same version of gdb and ddd in both cases).  
When stepping through the code I can see the cpsr is not zero as it gets 
sometimes copied to registers which I can view correctly.  Here's the 
debug trace from breakpoint(), then calling local_irq_disable() and 
local_irq_enable() which should modify the cpsr but gdb isn't showing 
the changes even though the other registers are being updated:

(gdb) target remote lcsdebug6:4013
0x000465dc in $d () at err.h:18
/home/lance/cpb/arm/os/linux-2.6.x/include/linux/err.h:18:429:beg:0x465dc
warning: shared library handler failed to enable breakpoint
(gdb) set debug remote 1
(gdb) up
Sending packet: $m465dc,4#33...Ack
Packet received: ffdeffe7
Sending packet: $m8344c,4#03...Ack
Packet received: 00300fe1
Sending packet: $m83430,4#cf...Ack
Packet received: 0dc0a0e1
Sending packet: $m83434,4#d3...Ack
Packet received: f0d92de9
Sending packet: $m83438,4#d7...Ack
Packet received: 04b04ce2
Sending packet: $m8343c,4#02...Ack
Packet received: 0add4de2
Sending packet: $m83440,4#d0...Ack
Packet received: 0050a0e1
Sending packet: $m83444,4#d4...Ack
Packet received: 0160a0e1
Sending packet: $m83448,4#d8...Ack
Packet received: 4f0cffeb
Sending packet: $m8344c,4#03...Ack
Packet received: 00300fe1
Sending packet: $m83450,4#d1...Ack
Packet received: 803083e3
Sending packet: $m83454,4#d5...Ack
Packet received: 03f021e1
Sending packet: $m83458,4#d9...Ack
Packet received: 00300fe1
Sending packet: $m8345c,4#04...Ack
Packet received: 8030c3e3
Sending packet: $m83460,4#d2...Ack
Packet received: 03f021e1
Sending packet: $m83464,4#d6...Ack
Packet received: 7c059fe5
Sending packet: $m83468,4#da...Ack
Packet received: 0510a0e1
Sending packet: $m8346c,4#05...Ack
Packet received: 0620a0e1
Sending packet: $m8344c,4#03...Ack
Packet received: 00300fe1
#1  0x0008344c in load_flat_binary (bprm=0xafa288, regs=0xaa1f6c) at 
fs/binfmt_flat.c:848
(gdb) break fs/binfmt_flat.c:849
Breakpoint 1 at 0x8344c: file fs/binfmt_flat.c, line 849.
(gdb) cont
Sending packet: $Z0,8344c,4#4c...Ack
Packet received: OK
Packet Z0 (software-breakpoint) is supported
Sending packet: $Hc0#db...Ack
Packet received: OK
Sending packet: $c#63...Ack
Packet received: T05thread:0000000000000001;
[New Thread 1]
Sending packet: $g#67...Ack
Packet received: 
88a2af006c1faa00000000008c932100a8c5190088a2af006c1faa00feffffff6c1faa006c1faa0010971900181faa00781caa00781caa004c3408004c34080000000000000000000000000000000000000000000000000000000000000000000000000013000060
Sending packet: $m8344c,4#03...Ack
Packet received: fedeffe7
Sending packet: $m8344c,4#03...Ack
Packet received: fedeffe7
Sending packet: $m83430,4#cf...Ack
Packet received: 0dc0a0e1
Sending packet: $m83434,4#d3...Ack
Packet received: f0d92de9
Sending packet: $m83438,4#d7...Ack
Packet received: 04b04ce2
Sending packet: $m8343c,4#02...Ack
Packet received: 0add4de2
Sending packet: $m83440,4#d0...Ack
Packet received: 0050a0e1
Sending packet: $m83444,4#d4...Ack
Packet received: 0160a0e1
Sending packet: $m83448,4#d8...Ack
Packet received: 4f0cffeb
Sending packet: $m8344c,4#03...Ack
Packet received: fedeffe7
Sending packet: $m83450,4#d1...Ack
Packet received: 803083e3
Sending packet: $m83454,4#d5...Ack
Packet received: 03f021e1
Sending packet: $m83458,4#d9...Ack
Packet received: 00300fe1
Sending packet: $m8345c,4#04...Ack
Packet received: 8030c3e3
Sending packet: $m83460,4#d2...Ack
Packet received: 03f021e1
Sending packet: $m83464,4#d6...Ack
Packet received: 7c059fe5
Sending packet: $m83468,4#da...Ack
Packet received: 0510a0e1
Sending packet: $m8346c,4#05...Ack
Packet received: 0620a0e1
Sending packet: $z0,8344c,4#6c...Ack
Packet received: OK

Breakpoint 1, load_flat_binary (bprm=0xafa288, regs=0xaa1f6c) at 
fs/binfmt_flat.c:849
(gdb) stepi
Sending packet: $m8344c,4#03...Ack
Packet received: 00300fe1
Sending packet: $Z0,83450,4#1a...Ack
Packet received: OK
Sending packet: $Hc1#dc...Ack
Packet received: OK
Sending packet: $c#63...Ack
Packet received: T05thread:0000000000000001;
Sending packet: $g#67...Ack
Packet received: 
88a2af006c1faa000000000013000060a8c5190088a2af006c1faa00feffffff6c1faa006c1faa0010971900181faa00781caa00781caa004c3408005034080000000000000000000000000000000000000000000000000000000000000000000000000013000060
Sending packet: $z0,83450,4#3a...Ack
Packet received: OK
Sending packet: $m83450,4#d1...Ack
Packet received: 803083e3
Sending packet: $m83450,4#d1...Ack
Packet received: 803083e3
Sending packet: $m83450,4#d1...Ack
Packet received: 803083e3
Sending packet: $m83430,4#cf...Ack
Packet received: 0dc0a0e1
Sending packet: $m83434,4#d3...Ack
Packet received: f0d92de9
Sending packet: $m83438,4#d7...Ack
Packet received: 04b04ce2
Sending packet: $m8343c,4#02...Ack
Packet received: 0add4de2
Sending packet: $m83440,4#d0...Ack
Packet received: 0050a0e1
Sending packet: $m83444,4#d4...Ack
Packet received: 0160a0e1
Sending packet: $m83448,4#d8...Ack
Packet received: 4f0cffeb
Sending packet: $m8344c,4#03...Ack
Packet received: 00300fe1
Sending packet: $m83450,4#d1...Ack
Packet received: 803083e3
Sending packet: $m83454,4#d5...Ack
Packet received: 03f021e1
Sending packet: $m83458,4#d9...Ack
Packet received: 00300fe1
Sending packet: $m8345c,4#04...Ack
Packet received: 8030c3e3
Sending packet: $m83460,4#d2...Ack
Packet received: 03f021e1
Sending packet: $m83464,4#d6...Ack
Packet received: 7c059fe5
Sending packet: $m83468,4#da...Ack
Packet received: 0510a0e1
Sending packet: $m8346c,4#05...Ack
Packet received: 0620a0e1
(gdb) stepi
Sending packet: $Z0,8344c,4#4c...Ack
Packet received: OK
Sending packet: $m83450,4#d1...Ack
Packet received: 803083e3
Sending packet: $Z0,83454,4#1e...Ack
Packet received: OK
Sending packet: $Hc0#db...Ack
Packet received: OK
Sending packet: $c#63...Ack
Packet received: T05thread:0000000000000001;
Sending packet: $g#67...Ack
Packet received: 
88a2af006c1faa000000000093000060a8c5190088a2af006c1faa00feffffff6c1faa006c1faa0010971900181faa00781caa00781caa004c3408005434080000000000000000000000000000000000000000000000000000000000000000000000000013000060
Sending packet: $z0,83454,4#3e...Ack
Packet received: OK
Sending packet: $m83454,4#d5...Ack
Packet received: 03f021e1
Sending packet: $m83454,4#d5...Ack
Packet received: 03f021e1
Sending packet: $m83454,4#d5...Ack
Packet received: 03f021e1
Sending packet: $m83430,4#cf...Ack
Packet received: 0dc0a0e1
Sending packet: $m83434,4#d3...Ack
Packet received: f0d92de9
Sending packet: $m83438,4#d7...Ack
Packet received: 04b04ce2
Sending packet: $m8343c,4#02...Ack
Packet received: 0add4de2
Sending packet: $m83440,4#d0...Ack
Packet received: 0050a0e1
Sending packet: $m83444,4#d4...Ack
Packet received: 0160a0e1
Sending packet: $m83448,4#d8...Ack
Packet received: 4f0cffeb
Sending packet: $m8344c,4#03...Ack
Packet received: fedeffe7
Sending packet: $m83450,4#d1...Ack
Packet received: 803083e3
Sending packet: $m83454,4#d5...Ack
Packet received: 03f021e1
Sending packet: $m83458,4#d9...Ack
Packet received: 00300fe1
Sending packet: $m8345c,4#04...Ack
Packet received: 8030c3e3
Sending packet: $m83460,4#d2...Ack
Packet received: 03f021e1
Sending packet: $m83464,4#d6...Ack
Packet received: 7c059fe5
Sending packet: $m83468,4#da...Ack
Packet received: 0510a0e1
Sending packet: $m8346c,4#05...Ack
Packet received: 0620a0e1
Sending packet: $z0,8344c,4#6c...Ack
Packet received: OK
(gdb) stepi
Sending packet: $Z0,8344c,4#4c...Ack
Packet received: OK
Sending packet: $m83454,4#d5...Ack
Packet received: 03f021e1
Sending packet: $Z0,83458,4#22...Ack
Packet received: OK
Sending packet: $c#63...Ack
Packet received: T05thread:0000000000000001;
Sending packet: $g#67...Ack
Packet received: 
88a2af006c1faa000000000093000060a8c5190088a2af006c1faa00feffffff6c1faa006c1faa0010971900181faa00781caa00781caa004c3408005834080000000000000000000000000000000000000000000000000000000000000000000000000093000060
Sending packet: $z0,83458,4#42...Ack
Packet received: OK
Sending packet: $m83458,4#d9...Ack
Packet received: 00300fe1
Sending packet: $m83458,4#d9...Ack
Packet received: 00300fe1
Sending packet: $m83458,4#d9...Ack
Packet received: 00300fe1
Sending packet: $m83430,4#cf...Ack
Packet received: 0dc0a0e1
Sending packet: $m83434,4#d3...Ack
Packet received: f0d92de9
Sending packet: $m83438,4#d7...Ack
Packet received: 04b04ce2
Sending packet: $m8343c,4#02...Ack
Packet received: 0add4de2
Sending packet: $m83440,4#d0...Ack
Packet received: 0050a0e1
Sending packet: $m83444,4#d4...Ack
Packet received: 0160a0e1
Sending packet: $m83448,4#d8...Ack
Packet received: 4f0cffeb
Sending packet: $m8344c,4#03...Ack
Packet received: fedeffe7
Sending packet: $m83450,4#d1...Ack
Packet received: 803083e3
Sending packet: $m83454,4#d5...Ack
Packet received: 03f021e1
Sending packet: $m83458,4#d9...Ack
Packet received: 00300fe1
Sending packet: $m8345c,4#04...Ack
Packet received: 8030c3e3
Sending packet: $m83460,4#d2...Ack
Packet received: 03f021e1
Sending packet: $m83464,4#d6...Ack
Packet received: 7c059fe5
Sending packet: $m83468,4#da...Ack
Packet received: 0510a0e1
Sending packet: $m8346c,4#05...Ack
Packet received: 0620a0e1
Sending packet: $z0,8344c,4#6c...Ack
Packet received: OK
(gdb) stepi
Sending packet: $Z0,8344c,4#4c...Ack
Packet received: OK
Sending packet: $m83458,4#d9...Ack
Packet received: 00300fe1
Sending packet: $Z0,8345c,4#4d...Ack
Packet received: OK
Sending packet: $c#63...Ack
Packet received: T05thread:0000000000000001;
Sending packet: $g#67...Ack
Packet received: 
88a2af006c1faa000000000093000060a8c5190088a2af006c1faa00feffffff6c1faa006c1faa0010971900181faa00781caa00781caa004c3408005c34080000000000000000000000000000000000000000000000000000000000000000000000000093000060
Sending packet: $z0,8345c,4#6d...Ack
Packet received: OK
Sending packet: $m8345c,4#04...Ack
Packet received: 8030c3e3
Sending packet: $m8345c,4#04...Ack
Packet received: 8030c3e3
Sending packet: $m8345c,4#04...Ack
Packet received: 8030c3e3
Sending packet: $m83430,4#cf...Ack
Packet received: 0dc0a0e1
Sending packet: $m83434,4#d3...Ack
Packet received: f0d92de9
Sending packet: $m83438,4#d7...Ack
Packet received: 04b04ce2
Sending packet: $m8343c,4#02...Ack
Packet received: 0add4de2
Sending packet: $m83440,4#d0...Ack
Packet received: 0050a0e1
Sending packet: $m83444,4#d4...Ack
Packet received: 0160a0e1
Sending packet: $m83448,4#d8...Ack
Packet received: 4f0cffeb
Sending packet: $m8344c,4#03...Ack
Packet received: fedeffe7
Sending packet: $m83450,4#d1...Ack
Packet received: 803083e3
Sending packet: $m83454,4#d5...Ack
Packet received: 03f021e1
Sending packet: $m83458,4#d9...Ack
Packet received: 00300fe1
Sending packet: $m8345c,4#04...Ack
Packet received: 8030c3e3
Sending packet: $m83460,4#d2...Ack
Packet received: 03f021e1
Sending packet: $m83464,4#d6...Ack
Packet received: 7c059fe5
Sending packet: $m83468,4#da...Ack
Packet received: 0510a0e1
Sending packet: $m8346c,4#05...Ack
Packet received: 0620a0e1
Sending packet: $z0,8344c,4#6c...Ack
Packet received: OK
(gdb) stepi
Sending packet: $Z0,8344c,4#4c...Ack
Packet received: OK
Sending packet: $m8345c,4#04...Ack
Packet received: 8030c3e3
Sending packet: $Z0,83460,4#1b...Ack
Packet received: OK
Sending packet: $c#63...Ack
Packet received: T05thread:0000000000000001;
Sending packet: $g#67...Ack
Packet received: 
88a2af006c1faa000000000013000060a8c5190088a2af006c1faa00feffffff6c1faa006c1faa0010971900181faa00781caa00781caa004c3408006034080000000000000000000000000000000000000000000000000000000000000000000000000093000060
Sending packet: $z0,83460,4#3b...Ack
Packet received: OK
Sending packet: $m83460,4#d2...Ack
Packet received: 03f021e1
Sending packet: $m83460,4#d2...Ack
Packet received: 03f021e1
Sending packet: $m83460,4#d2...Ack
Packet received: 03f021e1
Sending packet: $m83430,4#cf...Ack
Packet received: 0dc0a0e1
Sending packet: $m83434,4#d3...Ack
Packet received: f0d92de9
Sending packet: $m83438,4#d7...Ack
Packet received: 04b04ce2
Sending packet: $m8343c,4#02...Ack
Packet received: 0add4de2
Sending packet: $m83440,4#d0...Ack
Packet received: 0050a0e1
Sending packet: $m83444,4#d4...Ack
Packet received: 0160a0e1
Sending packet: $m83448,4#d8...Ack
Packet received: 4f0cffeb
Sending packet: $m8344c,4#03...Ack
Packet received: fedeffe7
Sending packet: $m83450,4#d1...Ack
Packet received: 803083e3
Sending packet: $m83454,4#d5...Ack
Packet received: 03f021e1
Sending packet: $m83458,4#d9...Ack
Packet received: 00300fe1
Sending packet: $m8345c,4#04...Ack
Packet received: 8030c3e3
Sending packet: $m83460,4#d2...Ack
Packet received: 03f021e1
Sending packet: $m83464,4#d6...Ack
Packet received: 7c059fe5
Sending packet: $m83468,4#da...Ack
Packet received: 0510a0e1
Sending packet: $m8346c,4#05...Ack
Packet received: 0620a0e1
Sending packet: $z0,8344c,4#6c...Ack
Packet received: OK
(gdb) stepi
Sending packet: $Z0,8344c,4#4c...Ack
Packet received: OK
Sending packet: $m83460,4#d2...Ack
Packet received: 03f021e1
Sending packet: $Z0,83464,4#1f...Ack
Packet received: OK
Sending packet: $c#63...Ack
Packet received: T05thread:0000000000000001;
Sending packet: $g#67...Ack
Packet received: 
88a2af006c1faa000000000013000060a8c5190088a2af006c1faa00feffffff6c1faa006c1faa0010971900181faa00781caa00781caa004c3408006434080000000000000000000000000000000000000000000000000000000000000000000000000013000060
Sending packet: $z0,83464,4#3f...Ack
Packet received: OK
Sending packet: $m83464,4#d6...Ack
Packet received: 7c059fe5
Sending packet: $m83464,4#d6...Ack
Packet received: 7c059fe5
Sending packet: $m83464,4#d6...Ack
Packet received: 7c059fe5
Sending packet: $m83430,4#cf...Ack
Packet received: 0dc0a0e1
Sending packet: $m83434,4#d3...Ack
Packet received: f0d92de9
Sending packet: $m83438,4#d7...Ack
Packet received: 04b04ce2
Sending packet: $m8343c,4#02...Ack
Packet received: 0add4de2
Sending packet: $m83440,4#d0...Ack
Packet received: 0050a0e1
Sending packet: $m83444,4#d4...Ack
Packet received: 0160a0e1
Sending packet: $m83448,4#d8...Ack
Packet received: 4f0cffeb
Sending packet: $m8344c,4#03...Ack
Packet received: fedeffe7
Sending packet: $m83450,4#d1...Ack
Packet received: 803083e3
Sending packet: $m83454,4#d5...Ack
Packet received: 03f021e1
Sending packet: $m83458,4#d9...Ack
Packet received: 00300fe1
Sending packet: $m8345c,4#04...Ack
Packet received: 8030c3e3
Sending packet: $m83460,4#d2...Ack
Packet received: 03f021e1
Sending packet: $m83464,4#d6...Ack
Packet received: 7c059fe5
Sending packet: $m83468,4#da...Ack
Packet received: 0510a0e1
Sending packet: $m8346c,4#05...Ack
Packet received: 0620a0e1
Sending packet: $z0,8344c,4#6c...Ack
Packet received: OK
(gdb)

Thanks,
Lance


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