[Bug 38886] New: AArch64 platforms: ABI Problems wrt varargs (needs arm64 specific __builtin_ms_va_list)

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=38886

            Bug ID: 38886
           Summary: AArch64 platforms: ABI Problems wrt varargs (needs
                    arm64 specific __builtin_ms_va_list)
           Product: Wine
           Version: 1.7.46
          Hardware: aarch64
               URL: http://go.microsoft.com/fwlink/p/?LinkId=536682
                OS: Linux
            Status: NEW
          Keywords: download
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: nerv at dawncrow.de
                CC: focht at gmx.net, nerv at dawncrow.de
      Distribution: ---

Hi,

running e.g. makecat.exe or midl.exe gives backtraces which suggest varargs
problems.

relevant part:
(stripped) Backtrace:
=>0 0x0000007f84d4aa04 raise_segv_exception(rec=0x7f83e8fa18,
context=0x7f83e8f908) in ntdll (0x0000007f83e8fab0)
  1 0x0000007f83d65864 pf_printf_w+0x8cb(pf_puts=0x7f83d61b18,
puts_ctx=0x7f83e8fc70, fmt=<is not available>, locale=<is not available>,
positional_params=0, invoke_invalid_param_handler=0x740020,
pf_args=0x78003000200068, args_ctx=0x2d0020003a0000, valist=0x7f83e8fcb0) in
msvcrt (0x0000007f83e8fab0)
  2 0x0000007f83d65864 pf_printf_w+0x8cb(pf_puts=0x7f83d67ec0,
puts_ctx=0x7f83e8fc70, fmt=<is not available>, locale=<is not available>,
positional_params=0, invoke_invalid_param_handler=0, pf_args=0x7f83d617d8,
args_ctx=0x0(nil), valist=0x7f83e8fcc8) in msvcrt (0x0000007f83e8fac0)
  3 0x0000007f83d65864 pf_printf_w+0x8cb(pf_puts=0x7f836822c0,
puts_ctx=0x0(nil), fmt=<is not available>, locale=<is not available>,
positional_params=0x40020000, invoke_invalid_param_handler=0x7f,
pf_args=0x140020000, args_ctx=0x140020000, valist=0x7f84280910) in msvcrt
(0x0000007f83e8fc50)
  4 0x0000007f83d67ec0 MSVCRT_vsnwprintf+0x47(str=<is not available>, len=<is
not available>, format=<is not available>, valist={__stack=0x7f836819f0,
__gr_top=0x140010170, __vr_top=0x7f8428071c, __gr_offs=0x83681a28,
__vr_offs=0x7f}) in msvcrt (0x0000007f83e8fc80)
  5 0x0000000140012328 in makecat (+0x12327) (0x0000007f83e8fcb0)
  6 0x00000001400123b0 in makecat (+0x123af) (0x0000007f83e8fcb0)

uuidgen.exe -i
this generates a different path which involves MSVCRT_vsnprintf, pf_printf_a
and pf_handle_string_a

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