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From: "tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug win32/30255] GDB on Windows cannot retrieve a stacktrace when a
 NULL function pointer is called
Date: Tue, 21 Mar 2023 18:30:32 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30255

--- Comment #4 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Tom Tromey from comment #3)
> I wonder where the unwound PC comes from.

Probably right there on the stack:

(gdb) x/20xb $sp
0x5ffd68:       0xf1    0x16    0x35    0x8e    0xf7    0x7f    0x00    0x00

(gdb) disassemble $
Dump of assembler code for function a:
   0x00007ff78e3516e0 <+0>:     push   %rbp
   0x00007ff78e3516e1 <+1>:     mov    %rsp,%rbp
   0x00007ff78e3516e4 <+4>:     sub    $0x20,%rsp
   0x00007ff78e3516e8 <+8>:     mov    0x5951(%rip),%rax        #
0x7ff78e357040 <func_ptr>
   0x00007ff78e3516ef <+15>:    call   *%rax
   0x00007ff78e3516f1 <+17>:    nop

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