How to get PPC registers

How to get PPC registers

[Fabian Cenedese]

Hi

After fruitless efforts to get a working cross-gdb (host=win32-i386, target=ppc)
with MinGW and DJGPP I finally managed to build one with cygwin. But I now
have a problem with the serial protocol itself. Here is a short session:

C:\cygwin\home\fabi\gdb-6.1.1\ppcout\gdb>gdb
GNU gdb 6.1.1
Copyright 2004 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 conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "--host=i686-pc-cygwin --target=powerpc-eabi".
(gdb) set debug remote 1
(gdb) file n:/temp/samism/samism.x
Reading symbols from n:/temp/samism/samism.x...done.
(gdb) target remote 127.0.0.1:10372
Remote debugging using 127.0.0.1:10372
Sending packet: $Hc-1#09...Ack
Packet received: OK
Sending packet: $qC#b4...Ack
Packet received: QC1
Sending packet: $qOffsets#4b...Ack
Packet received: Text=00000000;Data=00005000;Bss=00010000
Sending packet: $?#3f...Ack
Packet received: S00
Sending packet: $Hg1#e0...Ack
Packet received: OK
Sending packet: $g#67...Ack
Packet received: 000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1
f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464
748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6
f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969
798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbeb
fc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e
7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
0x00000000 in VTABLE ()
warning: no shared library support for this OS / ABI
Sending packet: $qSymbol::#5b...Ack
Packet received:
Packet qSymbol (symbol-lookup) is NOT supported
(gdb) info registers
r0             0x10203  66051
r1             0x4050607        67438087
r2             0x8090a0b        134810123
r3             0xc0d0e0f        202182159
r4             0x10111213       269554195
r5             0x14151617       336926231
r6             0x18191a1b       404298267
r7             0x1c1d1e1f       471670303
r8             0x20212223       539042339
r9             0x24252627       606414375
r10            0x28292a2b       673786411
r11            0x2c2d2e2f       741158447
r12            0x30313233       808530483
r13            0x34353637       875902519
r14            0x38393a3b       943274555
r15            0x3c3d3e3f       1010646591
r16            0x40414243       1078018627
r17            0x44454647       1145390663
r18            0x48494a4b       1212762699
r19            0x4c4d4e4f       1280134735
r20            0x50515253       1347506771
r21            0x54555657       1414878807
r22            0x58595a5b       1482250843
r23            0x5c5d5e5f       1549622879
r24            0x60616263       1616994915
r25            0x64656667       1684366951
r26            0x68696a6b       1751738987
r27            0x6c6d6e6f       1819111023
r28            0x70717273       1886483059
r29            0x74757677       1953855095
r30            0x78797a7b       2021227131
r31            0x7c7d7e7f       2088599167
pc             0x0      0
ps             0x0      0
cr             0x0      0
lr             0x0      0
ctr            0x0      0
xer            0x0      0
fpscr          0x0      0
vscr           0x0      0
vrsave         0x0      0
(gdb)

The values I return for the registers are just made up to test the
communication. But they are only filled into the general (and FP)
registers. What command do I have to use to get the special
registers like pc, lr etc?

Thanks

bye  Fabi

Re: How to get PPC registers

[Steven Johnson]

Fabian Cenedese wrote:
> What command do I have to use to get the special
> registers like pc, lr etc?
>
You need to set the architecture to the chip type you are using to see 
the SPR's. Then the remote protocol packet will change, and expect more 
data.

check out 'set architecture' or something like that. (Dont have a 
working GDB with me to test out on for exact command, sorry.)

Steven

> Thanks
> 
> bye  Fabi
> 
> 
> 

Re: How to get PPC registers

[Jim Blandy]

Fabian Cenedese <Cenedese@indel.ch> writes:
> The values I return for the registers are just made up to test the
> communication. But they are only filled into the general (and FP)
> registers. What command do I have to use to get the special
> registers like pc, lr etc?

You should try saying 'info all-registers', which will also show you
the floating-point registers.  The FP registers follow the
general-purpose registers in the 'g' packet; since there are 32 of
them, and each is eight bytes long, they consume bytes 128 -- 384 of
the 'g' packet.  Your sample packet data isn't long enough to reach
the miscellaneous registers.