diff --git a/lib/linux/x86_64-mes-gcc/syscall-internal.c b/lib/linux/x86_64-mes-gcc/syscall-internal.c
new file mode 100644
index 00000000..c9d05467
--- /dev/null
+++ b/lib/linux/x86_64-mes-gcc/syscall-internal.c
@@ -0,0 +1,67 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2016,2017,2018,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes 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 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <linux/x86_64/syscall.h>
+
+// *INDENT-OFF*
+static long
+__sys_call_internal (long sys_call)
+{
+  long r;
+  asm (
+       "mov     %1,%%rax\n\t"
+       "syscall \n\t"
+       "mov     %%rax,%0\n\t"
+       : "=r" (r)
+       : "rm" (sys_call)
+       : "rax"
+       );
+  return r;
+}
+
+static long
+__sys_call2_internal (long sys_call, long one, long two)
+{
+  long r;
+  asm (
+       "mov     %1,%%rax\n\t"
+       "mov     %2,%%rdi\n\t"
+       "mov     %3,%%rsi\n\t"
+       "syscall \n\t"
+       "mov     %%rax,%0\n\t"
+       : "=r" (r)
+       : "rm" (sys_call), "rm" (one), "rm" (two)
+       : "rax", "rdi", "rsi"
+       );
+  return r;
+}
+// *INDENT-ON*
+
+/* Return < 0 on error (errno-like value from kernel), or 0 on success */
+int
+__raise (int signum)
+{
+  long pid = __sys_call_internal (SYS_getpid);
+  if (pid < 0)
+    return pid;
+  else
+    return __sys_call2_internal (SYS_kill, pid, signum);
+}
diff --git a/lib/linux/x86_64-mes-mescc/syscall-internal.c b/lib/linux/x86_64-mes-mescc/syscall-internal.c
new file mode 100644
index 00000000..156a47b4
--- /dev/null
+++ b/lib/linux/x86_64-mes-mescc/syscall-internal.c
@@ -0,0 +1,61 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2016,2017,2018,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes 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 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <linux/x86_64/syscall.h>
+
+static long
+__sys_call_internal (long sys_call)
+{
+#if 0                           // !MES_CCAMD64
+  asm ("mov____0x8(%rbp),%rdi !0x10");
+#else
+  asm ("mov____0x8(%rbp),%rax !0x10");
+#endif
+
+  asm ("syscall");
+}
+
+static long
+__sys_call2_internal (long sys_call, long one, long two)
+{
+#if 0                           // !MES_CCAMD64
+  asm ("mov____0x8(%rbp),%rdi !0x10");
+  asm ("mov____0x8(%rbp),%rsi !0x18");
+  asm ("mov____0x8(%rbp),%rdx !0x20");
+#else
+  asm ("mov____0x8(%rbp),%rax !0x10");
+  asm ("mov____0x8(%rbp),%rdi !0x18");
+  asm ("mov____0x8(%rbp),%rsi !0x20");
+#endif
+
+  asm ("syscall");
+}
+
+/* Return < 0 on error (errno-like value from kernel), or 0 on success */
+int
+__raise (int signum)
+{
+  long pid = __sys_call_internal (SYS_getpid);
+  if (pid < 0)
+    return pid;
+  else
+    return __sys_call2_internal (SYS_kill, pid, signum);
+}