Fix gdbserver build for x86-64 Windows

I broke the gdbserver build on x86-64 Windows a little while back.
Previously, I could not build this configuration, but today I found
out that if I configure with:

    --host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32

using the Fedora 34 tools, it will in fact build.  I'm not certain,
but maybe the gnulib update helped with this.

This patch fixes the build.  I'm checking it in.

3 files changed, 36 insertions, 28 deletions

diff --git a/gdbserver/win32-i386-low.cc b/gdbserver/win32-i386-low.cc
index 2b18c2c..8560408 100644
--- a/gdbserver/win32-i386-low.cc
+++ b/gdbserver/win32-i386-low.cc
@@ -85,7 +85,7 @@ win32_get_current_dr (int dr)
   case DR:					\
     return th->wow64_context.Dr ## DR
 
-  if (wow64_process)
+  if (windows_process.wow64_process)
     {
       switch (dr)
 	{
@@ -245,7 +245,7 @@ i386_get_thread_context (windows_thread_info *th)
 
  again:
 #ifdef __x86_64__
-  if (wow64_process)
+  if (windows_process.wow64_process)
     th->wow64_context.ContextFlags = (CONTEXT_FULL
 				      | CONTEXT_FLOATING_POINT
 				      | CONTEXT_DEBUG_REGISTERS
@@ -259,7 +259,7 @@ i386_get_thread_context (windows_thread_info *th)
 
   BOOL ret;
 #ifdef __x86_64__
-  if (wow64_process)
+  if (windows_process.wow64_process)
     ret = Wow64GetThreadContext (th->h, &th->wow64_context);
   else
 #endif
@@ -288,7 +288,7 @@ i386_prepare_to_resume (windows_thread_info *th)
       win32_require_context (th);
 
 #ifdef __x86_64__
-      if (wow64_process)
+      if (windows_process.wow64_process)
 	{
 	  th->wow64_context.Dr0 = dr->dr_mirror[0];
 	  th->wow64_context.Dr1 = dr->dr_mirror[1];
@@ -324,7 +324,7 @@ static void
 i386_single_step (windows_thread_info *th)
 {
 #ifdef __x86_64__
-  if (wow64_process)
+  if (windows_process.wow64_process)
     th->wow64_context.EFlags |= FLAG_TRACE_BIT;
   else
 #endif
@@ -466,7 +466,7 @@ i386_fetch_inferior_register (struct regcache *regcache,
 {
   const int *mappings;
 #ifdef __x86_64__
-  if (!wow64_process)
+  if (!windows_process.wow64_process)
     mappings = amd64_mappings;
   else
 #endif
@@ -474,7 +474,7 @@ i386_fetch_inferior_register (struct regcache *regcache,
 
   char *context_offset;
 #ifdef __x86_64__
-  if (wow64_process)
+  if (windows_process.wow64_process)
     context_offset = (char *) &th->wow64_context + mappings[r];
   else
 #endif
@@ -502,7 +502,7 @@ i386_store_inferior_register (struct regcache *regcache,
 {
   const int *mappings;
 #ifdef __x86_64__
-  if (!wow64_process)
+  if (!windows_process.wow64_process)
     mappings = amd64_mappings;
   else
 #endif
@@ -510,7 +510,7 @@ i386_store_inferior_register (struct regcache *regcache,
 
   char *context_offset;
 #ifdef __x86_64__
-  if (wow64_process)
+  if (windows_process.wow64_process)
     context_offset = (char *) &th->wow64_context + mappings[r];
   else
 #endif
@@ -550,7 +550,7 @@ i386_win32_num_regs (void)
 {
   int num_regs;
 #ifdef __x86_64__
-  if (!wow64_process)
+  if (!windows_process.wow64_process)
     num_regs = sizeof (amd64_mappings) / sizeof (amd64_mappings[0]);
   else
 #endif
diff --git a/gdbserver/win32-low.cc b/gdbserver/win32-low.cc
index afeed1a..192ea46 100644
--- a/gdbserver/win32-low.cc
+++ b/gdbserver/win32-low.cc
@@ -38,7 +38,8 @@
 
 using namespace windows_nat;
 
-static windows_process_info windows_process;
+/* See win32-low.h.  */
+windows_process_info windows_process;
 
 #ifndef USE_WIN32API
 #include <sys/cygwin.h>
@@ -113,7 +114,7 @@ static void
 win32_get_thread_context (windows_thread_info *th)
 {
 #ifdef __x86_64__
-  if (wow64_process)
+  if (windows_process.wow64_process)
     memset (&th->wow64_context, 0, sizeof (WOW64_CONTEXT));
   else
 #endif
@@ -127,7 +128,7 @@ static void
 win32_set_thread_context (windows_thread_info *th)
 {
 #ifdef __x86_64__
-  if (wow64_process)
+  if (windows_process.wow64_process)
     Wow64SetThreadContext (th->h, &th->wow64_context);
   else
 #endif
@@ -150,7 +151,7 @@ win32_require_context (windows_thread_info *th)
 {
   DWORD context_flags;
 #ifdef __x86_64__
-  if (wow64_process)
+  if (windows_process.wow64_process)
     context_flags = th->wow64_context.ContextFlags;
   else
 #endif
@@ -192,7 +193,7 @@ child_add_thread (DWORD pid, DWORD tid, HANDLE h, void *tlb)
 #ifdef __x86_64__
   /* For WOW64 processes, this is actually the pointer to the 64bit TIB,
      and the 32bit TIB is exactly 2 pages after it.  */
-  if (wow64_process)
+  if (windows_process.wow64_process)
     base += 2 * 4096; /* page size = 4096 */
 #endif
   th = new windows_thread_info (tid, h, base);
@@ -354,19 +355,20 @@ do_initial_child_stuff (HANDLE proch, DWORD pid, int attached)
       error ("Check if WOW64 process failed (error %d): %s\n",
 	     (int) err, strwinerror (err));
     }
-  wow64_process = wow64;
+  windows_process.wow64_process = wow64;
 
-  if (wow64_process
+  if (windows_process.wow64_process
       && (Wow64GetThreadContext == nullptr
 	  || Wow64SetThreadContext == nullptr))
     error ("WOW64 debugging is not supported on this system.\n");
 
-  ignore_first_breakpoint = !attached && wow64_process;
+  windows_process.ignore_first_breakpoint
+    = !attached && windows_process.wow64_process;
 #endif
 
   proc = add_process (pid, attached);
 #ifdef __x86_64__
-  if (wow64_process)
+  if (windows_process.wow64_process)
     proc->tdesc = wow64_win32_tdesc;
   else
 #endif
@@ -440,7 +442,7 @@ continue_one_thread (thread_info *thread, int thread_id)
 	{
 	  DWORD *context_flags;
 #ifdef __x86_64__
-	  if (wow64_process)
+	  if (windows_process.wow64_process)
 	    context_flags = &th->wow64_context.ContextFlags;
 	  else
 #endif
@@ -913,7 +915,7 @@ win32_process_target::resume (thread_resume *resume_info, size_t n)
 
       DWORD *context_flags;
 #ifdef __x86_64__
-      if (wow64_process)
+      if (windows_process.wow64_process)
 	context_flags = &th->wow64_context.ContextFlags;
       else
 #endif
@@ -1419,19 +1421,22 @@ win32_process_target::qxfer_siginfo (const char *annex,
 
 #ifdef __x86_64__
   EXCEPTION_RECORD32 er32;
-  if (wow64_process)
+  if (windows_process.wow64_process)
     {
       buf = (char *) &er32;
       bufsize = sizeof (er32);
 
-      er32.ExceptionCode = siginfo_er.ExceptionCode;
-      er32.ExceptionFlags = siginfo_er.ExceptionFlags;
-      er32.ExceptionRecord = (uintptr_t) siginfo_er.ExceptionRecord;
-      er32.ExceptionAddress = (uintptr_t) siginfo_er.ExceptionAddress;
-      er32.NumberParameters = siginfo_er.NumberParameters;
+      er32.ExceptionCode = windows_process.siginfo_er.ExceptionCode;
+      er32.ExceptionFlags = windows_process.siginfo_er.ExceptionFlags;
+      er32.ExceptionRecord
+	= (uintptr_t) windows_process.siginfo_er.ExceptionRecord;
+      er32.ExceptionAddress
+	= (uintptr_t) windows_process.siginfo_er.ExceptionAddress;
+      er32.NumberParameters = windows_process.siginfo_er.NumberParameters;
       int i;
       for (i = 0; i < EXCEPTION_MAXIMUM_PARAMETERS; i++)
-	er32.ExceptionInformation[i] = siginfo_er.ExceptionInformation[i];
+	er32.ExceptionInformation[i]
+	  = windows_process.siginfo_er.ExceptionInformation[i];
     }
 #endif
 
diff --git a/gdbserver/win32-low.h b/gdbserver/win32-low.h
index a1d7457..c5f40dd 100644
--- a/gdbserver/win32-low.h
+++ b/gdbserver/win32-low.h
@@ -162,6 +162,9 @@ public:
   const char *thread_name (ptid_t thread) override;
 };
 
+/* The sole Windows process.  */
+extern windows_nat::windows_process_info windows_process;
+
 /* Retrieve the context for this thread, if not already retrieved.  */
 extern void win32_require_context (windows_nat::windows_thread_info *th);