[Bug tdep/31089] New: [gdb/tdep, arm] FAIL: gdb.base/longjmp-until-in-main.exp: until $line, in main

[Bug tdep/31089] New: [gdb/tdep, arm] FAIL: gdb.base/longjmp-until-in-main.exp: until $line, in main

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31089

            Bug ID: 31089
           Summary: [gdb/tdep, arm] FAIL:
                    gdb.base/longjmp-until-in-main.exp: until $line, in
                    main
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tdep
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

On a pinebook, I ran into:
...
(gdb) until 33^M
Warning:^M
Cannot insert breakpoint 0.^M
Cannot access memory at address 0x0^M
^M
0xf76d57e8 in siglongjmp () from /lib/arm-linux-gnueabihf/libc.so.6^M
(gdb) FAIL: gdb.base/longjmp-until-in-main.exp: until $line, in main
...

This is a partly a duplicate of PR26967, in the sense that the longjmp target
is mangled.

But there is another problem: it's read from the wrong offset (hence address
0x0).  

The tdep->jb_pc value is 9, but the actual value seems to be 1.  See
./sysdeps/arm/setjmp.S from glibc.

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