Re: gdb / thread_db / multiple ABI question
Steve Ellcey <[email protected]>
| Newsgroups | gmane.comp.gdb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Fri, 2017-07-07 at 19:36 +0100, Pedro Alves wrote: > > Though I have no idea whether an Aarch64 build of libthread_db is > capable of biarch debugging. It may be that GDB is already trying to > the load the 64-bit libthread_db, but then libthread_db rejects > the inferior for some reason. The "set debug libthread-db" option > should > help you figure that out. See below. OK, setting libthread-db-search-path and debug libthread-db got me a bit further. I don't get any errors or warnings about not being able to find or load libthread_db. It's still not reading everything correctly though: (gdb) info threads Found 0 new threads in iteration 0. Id Target Id Frame * 3 Thread 0xf739ef70 (LWP 8660) 0x00400680 in doSomeThing () 4 Thread 0xf69bf490 (LWP 8662) warning: Couldn't find general-purpose registers in core file. PC register is not available I don't see any code in gdb/linux-thread-db.c that seems to be conditional on the word size (ILP32 vs LP64). I also don't see anything in glibc nptl-db directory that appears to be conditional on word size. Things like pthread_t and __SIZEOF_PTHREAD_ATTR_T are different for the two different ABIs though. But that is true for x86 too and things seem to be working there. I am not sure what (if anything) would need to be done to libthread_db to support biarch debugging. Steve Ellcey [email protected]