3 files changed, 61 insertions, 1 deletions
diff --git a/libgcc/config/nvptx/alloca.c b/libgcc/config/nvptx/alloca.c
new file mode 100644
index 0000000..09bdeb6
--- /dev/null
+++ b/libgcc/config/nvptx/alloca.c
@@ -0,0 +1,38 @@
+/* Fake 'alloca' implementation.
+
+   Copyright (C) 2025 Free Software Foundation, Inc.
+
+   This file is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 3, or (at your option) any
+   later version.
+
+   This file is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* For '-mfake-ptx-alloca', in case real PTX 'alloca' is not available.
+   With this function defined, we don't get a link-time failure
+   (unresolved symbol '__GCC_nvptx__PTX_alloca_not_supported'), but rather:
+   successful execution, in case that 'alloca' is not attempted (if only used
+   in error code paths, for example), and a run-time failure only in case that
+   'alloca' is actually attempted.  */
+
+void *
+__GCC_nvptx__PTX_alloca_not_supported (__SIZE_TYPE__ size __attribute__ ((unused)))
+{
+  __builtin_printf ("GCC/nvptx: sorry, unimplemented:"
+		    " dynamic stack allocation not supported\n");
+  __builtin_abort ();
+  return 0;
+}
diff --git a/libgcc/config/nvptx/t-nvptx b/libgcc/config/nvptx/t-nvptx
index f295898..5e2e278 100644
--- a/libgcc/config/nvptx/t-nvptx
+++ b/libgcc/config/nvptx/t-nvptx
@@ -1,7 +1,8 @@
 LIB2ADD=$(srcdir)/config/nvptx/reduction.c \
 	$(srcdir)/config/nvptx/mgomp.c \
 	$(srcdir)/config/nvptx/atomic.c \
-	$(srcdir)/config/nvptx/unwind-nvptx.c
+	$(srcdir)/config/nvptx/unwind-nvptx.c \
+	$(srcdir)/config/nvptx/alloca.c
 
 LIB2ADDEH=
 LIB2FUNCS_EXCLUDE=
diff --git a/libgcc/config/nvptx/unwind-nvptx.c b/libgcc/config/nvptx/unwind-nvptx.c
index 44657ae..eae741c 100644
--- a/libgcc/config/nvptx/unwind-nvptx.c
+++ b/libgcc/config/nvptx/unwind-nvptx.c
@@ -25,6 +25,27 @@
 #include "unwind.h"
 
 _Unwind_Reason_Code
+_Unwind_RaiseException(struct _Unwind_Exception *exc __attribute__ ((__unused__)))
+{
+  __builtin_abort ();
+  return 0;
+}
+
+void
+_Unwind_DeleteException (struct _Unwind_Exception *exc)
+{
+  if (exc->exception_cleanup)
+    (*exc->exception_cleanup) (_URC_FOREIGN_EXCEPTION_CAUGHT, exc);
+}
+
+_Unwind_Reason_Code
+_Unwind_Resume_or_Rethrow (struct _Unwind_Exception *exc __attribute__ ((__unused__)))
+{
+  __builtin_abort ();
+  return 0;
+}
+
+_Unwind_Reason_Code
 _Unwind_Backtrace(_Unwind_Trace_Fn trace, void * trace_argument)
 {
   return 0;