[Bug debug/83917] New: [8 Regression] with -mcall-ms2sysv-xlogues, stepping into x86 tail-call restore stub gives bad backtrace

[daniel.santos at pobox dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83917

            Bug ID: 83917
           Summary: [8 Regression] with -mcall-ms2sysv-xlogues, stepping
                    into x86 tail-call restore stub gives bad backtrace
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: daniel.santos at pobox dot com
  Target Milestone: ---
            Target: x86-64-*-*

Here is an example.

0x000000007bc8fd8e      465         if ((status = alloc_object_attributes(
attr, &objattr, &len ))) return status;
1: x/2i $rip
=> 0x7bc8fd8e <NtCreateMutant+78>:      jmpq   0x7bcaebbc <__sse_resms64fx_16>
   0x7bc8fd93 <NtCreateMutant+83>:      nopl   0x0(%rax,%rax,1)
Wine-gdb>
__sse_resms64fx_16 () at
/home/daniel/proj/sys/gcc/git/libgcc/config/i386/resms64fx.h:39
39              mov     -0x60(%rsi),%r14
1: x/2i $rip
=> 0x7bcaebbc <__sse_resms64fx_16>:     mov    -0x60(%rsi),%r14
   0x7bcaebc0 <__sse_resms64fx_15>:     mov    -0x58(%rsi),%r13
Wine-gdb> bt
#0  __sse_resms64fx_16 () at
/home/daniel/proj/sys/gcc/git/libgcc/config/i386/resms64fx.h:39
#1  0x006900750062005c in ?? ()
#2  0x006d005c0064006c in ?? ()
#3  0x003b00320033006d in ?? ()
#4  0x0077005c003a0043 in ?? ()
#5  0x0000003c006e0069 in ?? ()
#6  0x0000000000034850 in ?? ()
#7  0x0000000000000000 in ?? ()

At this point, I'm not emitting any debug information in the stubs.