Use elfwrap :-)

uts/debian/elfwrap

@@ -0,0 +1,101 @@
+#!/bin/sh
+
+set -e
+set -u
+
+# Default output file name:
+outputfile="a.wrap.o"
+
+# --32 or --64. Empty by default. To pass to GNU as.
+bitness=""
+
+# Print assembler source code to stdout
+# instead of compiling to ELF object
+show_source="no"
+
+fatal () {
+    echo "$0: $@" >&2
+    echo "$0: Type \`$0 -h' to get help" >&2
+    exit 2
+}
+
+usage () {
+    echo "$0 [ -64 | -32 ] [ -o outputfile ] [ -s ] files ..."
+    exit 1
+}
+
+
+files=""
+collect() {
+    files="$files$1|"
+}
+
+processing_options="yes"
+
+while [ $# != 0 ]; do
+    opt="$1"
+    shift
+    if [ "$processing_options" = yes ]; then
+        case "$opt" in
+            --)
+                processing_options="no"
+                ;;
+            -s)
+                show_source="yes"
+                ;;
+            -h|--help)
+                usage
+                ;;
+            -32|--32)
+                bitness="--32"
+                ;;
+            -64|--64)
+                bitness="--64"
+                ;;
+            -o)
+                [ $# != 0 ] || fatal "Option -o requires an argument"
+                outputfile="$1"
+                shift
+                ;;
+            -*)
+                fatal "Invalid option: $opt"
+                ;;
+            *)
+                collect "$opt"
+                ;;
+        esac
+    else
+        collect "$opt"
+    fi
+done
+
+
+if [ -z "$files" ]; then
+    fatal "No files given."
+fi
+
+(
+IFS='|'
+set -- $files
+for f in "$@"; do
+    base=`basename -- "$f" | sed -e 's,[^0-9a-zA-Z_],_,g' -e 's,^\([0-9]\),_\1,'`
+    echo ".section .${base}, \"a\", @progbits"
+    echo ".global ${base}_start"
+    echo ".global ${base}_end"
+    echo ".type ${base}_start, @object"
+    echo ".type ${base}_end, @object"
+    echo "${base}_start:"
+    echo ".incbin \"$f\""
+    echo "${base}_end:"
+    echo
+done
+) | (
+if [ "$show_source" = yes ]; then
+    cat
+else
+    as $bitness -o "$outputfile" --
+fi
+)
+
+exit 0
+

uts/debian/rules

@@ -11,6 +11,10 @@ unpack-stamp:
 	dh_illumos_gate --build \
 		usr/src/uts \
 		usr/src/common
+	# this a shell script generating assembler source files
+	# and passing that source to as.
+	# Default output format is expected to be 32-bit:
+	echo "export ELFWRAP='$(CURDIR)/debian/elfwrap -32'" >> usr/env.sh
 	touch $@
 
 patch: patch-stamp