Hi Romaric,
The call to Disassembler::FindPlugin should have arch set to your triple. If
m_options.arch is not set on the disassembly command line, it will get it from
the target:
if (!m_options.arch.IsValid())
m_options.arch = target->GetArchitecture();
That leads me to wonder if your triple is set correctly after you do the run.
What is the output from these commands, when you’re stopped?:
target list
platform status
My guess is you’re connected to a remote gdb-server on a simulator for dpu, and
it’s telling lldb that the triple is x86_64.x.x.
If target list says the arch is dpu before the run, and x86_64 after the run,
we should look at the RSP log. Before the run, type
log enable -f <file> gdb-remote packets
Attach the file to your next message.
Ted
From: Romaric Jodin <rjo...@upmem.com>
Sent: Thursday, June 13, 2019 1:16 AM
To: Ted Woodward <tedw...@quicinc.com>
Cc: LLDB <lldb-dev@lists.llvm.org>
Subject: [EXT] Re: [lldb-dev] Disassembling issue
Hi Ted,
Thank you for the answer.
I'm not sure I understand you well. It seems to me that my program call
"Disassembler::FindPlugin" with the "m_options.arch" set to "x86_64". But my
toolchain does not contain a LLVM supporting x86_64, so it feels normal to me
that it is not able to create this disassembler. What is weird is that the
first time I'm executing it, it managed to do so.
I also have kind of the same issue with breakpoint. It's like if I'm missing
the debug information after I do the "run" command:
(lldb) file test
Current executable set to 'test' (dpu).
(lldb) b main
Breakpoint 1: where = test`main + 24 at test.c:8, address = 0x80000078
(lldb) r
Process 21312 launched: '/home/rjodin/work/dpu_tools/llvm/lldb/test/test' (dpu)
Process 21312 stopped
* thread #1, name = 'DPUthread0', stop reason = Thread finished
frame #0: 0x00000000800000c0
(lldb) b main
Breakpoint 2: no locations (pending).
WARNING: Unable to resolve breakpoint to any actual locations.
When I'm doing the disassembly, I can manage to disassemble if I add the option
with my architecture to the command line, but as you can see below, I also do
not have the debug information that I had at the first disassembly:
(lldb) file test
Current executable set to 'test' (dpu).
(lldb) dis -s 0x80000000
test`__bootstrap:
test[0x80000000] <+0>: jnz id, 0x80000020
test[0x80000008] <+8>: move r0, 0xff
test[0x80000010] <+16>: release r0, 0x0, nz, 0x80000018
test[0x80000018] <+24>: sub r0, r0, 0x1, pl, 0x80000010
(lldb) r
Process 21312 launched: '/home/rjodin/work/dpu_tools/llvm/lldb/test/test' (dpu)
Process 21312 stopped
* thread #1, name = 'DPUthread0', stop reason = Thread finished
frame #0: 0x00000000800000a0
(lldb) dis -s 0x80000000
error: Unable to find Disassembler plug-in for the 'x86_64' architecture.
(lldb) dis -s 0x80000000 -A dpu
0x80000000: jnz id, 0x80000020
0x80000008: move r0, 0xff
0x80000010: release r0, 0x0, nz, 0x80000018
0x80000018: sub r0, r0, 0x1, pl, 0x80000010
Any ideas about it?
Thanks,
Romaric
On Wed, Jun 12, 2019 at 6:55 PM Ted Woodward
<tedw...@quicinc.com<mailto:tedw...@quicinc.com>> wrote:
The error is coming from source/Commands/CommandObjectDisassemble.cpp . It’s
not able to create the disassembler for your architecture. The call to
Disassembler::FindPlugin fails.
My guess is something in the call to MCDisasmInstance::Create in
source/Plugins/Disassembler/llvm/DisassemblerLLVMC.cpp is failing. Step through
that and make sure everything there is working.
Ted
From: lldb-dev
<lldb-dev-boun...@lists.llvm.org<mailto:lldb-dev-boun...@lists.llvm.org>> On
Behalf Of Romaric Jodin via lldb-dev
Sent: Wednesday, June 12, 2019 8:23 AM
To: lldb-dev@lists.llvm.org<mailto:lldb-dev@lists.llvm.org>
Subject: [EXT] [lldb-dev] Disassembling issue
Hi everyone,
I'm trying to have lldb being able to debug my architecture. It does it well
after loading my elf. But then I run it, stop it in middle, try to disassemble
and at that point it seems that I lost some information about my architecture.
lldb tries to disassemble it for x86, which in not possible with my toolchain.
Here is a log of what I am doing:
(lldb) file test
Current executable set to 'test' (dpu).
(lldb) dis -s 0x80000000
test`__bootstrap:
test[0x80000000] <+0>: jnz id, 0x80000020
test[0x80000008] <+8>: move r0, 0xff
test[0x80000010] <+16>: release r0, 0x0, nz, 0x80000018
test[0x80000018] <+24>: sub r0, r0, 0x1, pl, 0x80000010
(lldb) r
Process 21312 launched: '/home/rjodin/work/dpu_tools/llvm/lldb/test/test' (dpu)
Process 21312 stopped
* thread #1, name = 'DPUthread0', stop reason = Thread stopped
frame #0: 0x0000000080000090
(lldb) dis -s 0x80000000
error: Unable to find Disassembler plug-in for the 'x86_64' architecture.
(lldb)
Any ideas of what I am missing in my implementation?
Thanks,
--
Romaric JODIN
UPMEM
Software Engineer
[cid:image001.png@01D521DB.DDFD0A00]
--
Romaric JODIN
UPMEM
Software Engineer
[cid:image001.png@01D521DB.DDFD0A00]
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