[lldb-dev] [Bug 40141] New: LLDB does not support armvXl, armvXb, armvXlhf, armvXbhf, arm64l, aarch64l and aarch64b
lldb-dev at lists.llvm.org
Sat Dec 22 17:22:05 PST 2018
Bug ID: 40141
Summary: LLDB does not support armvXl, armvXb, armvXlhf,
armvXbhf, arm64l, aarch64l and aarch64b
Component: All Bugs
Assignee: lldb-dev at lists.llvm.org
Reporter: kenji.koyanagi at gmail.com
CC: llvm-bugs at lists.llvm.org
Created attachment 21269
Patch for 5.0.2
I tried to debug an application on armv7l-linux but it did not work. I applied
the below patch, but the result was the same.
The behavior of current LLDB + above patch:
I set a breakpoint at line 6, but not worked after line 16.
LLDB changed arch arm-*-linux-eabihf to armv7l-unknown-unknown at line 8-12.
I was not able to set breakpoint at line 13.
1 (lldb) file ~/a.out
2 Current executable set to '~/a.out' (arm).
3 (lldb) target list
4 Current targets:
5 * target #0: /home/common/a.out ( arch=arm-*-linux-eabihf,
6 (lldb) b main
7 Breakpoint 1: where = a.out`main, address = 0x000103f4
8 (lldb) process launch --stop-at-entry
9 Process 5659 launched: '/home/common/a.out' (arm)
10 (lldb) target list
11 Current targets:
12 * target #0: <none> ( arch=armv7l-unknown-unknown, platform=host,
pid=5659, state=stopped )
13 (lldb) b main
14 Breakpoint 2: no locations (pending).
15 WARNING: Unable to resolve breakpoint to any actual locations.
16 (lldb) c
17 Process 5659 resuming
19 Process 5659 exited with status = 0 (0x00000000)
I am using Digilent Zybo, but same problem will probably occur in RaspberryPi.
I think there is a bug in ArchSpec::MergeFrom.
LLDB loses vendor and OS name by calling ArchSpec::CoreUpdated(true) to set
I think this problem is caused by the fact that SubArch can only be set by the
constructor of llvm::Triple.
LLDB worked fine by saving those information.
I judged that the FindCoreDefinition should be modified to support cores other
than armv7 and little-endian, so the above patch is not good.
I have created a patch. Are there any arm users who can try this?
I used 5.0.2 and 6.0.1 because libcxxabi of 7.0.0 failed in build on arm.
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