core: Add abort.

* lib/stub/__raise.c: New file.
* kaem.run: Use it.
* src/posix.c (__raise)[SYSTEM_LIBC]: New macro.
 (abort_): New function: possibly use it.
* include/mes/builtins.h: Declare it.
* src/builtins.c (mes_builtins): Register it.

build-aux/configure-lib.sh

@@ -107,6 +107,7 @@ lib/mes/ntoab.c
 lib/mes/oputc.c
 lib/mes/ultoa.c
 lib/mes/utoa.c
+lib/stub/__raise.c
 "
 
 if test $mes_libc = mes; then

include/mes/builtins.h

@@ -103,6 +103,7 @@ struct scm *module_variable (struct scm *module, struct scm *name);
 struct scm *module_ref (struct scm *module, struct scm *name);
 struct scm *module_define_x (struct scm *module, struct scm *name, struct scm *value);
 /* src/posix.c */
+struct scm *abort_ ();
 struct scm *exit_ (struct scm *x);
 struct scm *peek_byte ();
 struct scm *read_byte ();

include/mes/lib.h

@@ -84,5 +84,6 @@ unsigned long __mesabi_uldiv (unsigned long a, unsigned long b,
 void *__memcpy (void *dest, void const *src, size_t n);
 void *__memmove (void *dest, void const *src, size_t n);
 void *__memset (void *s, int c, size_t n);
+int __raise (int signal);
 
 #endif //__MES_LIB_H

kaem.run

@@ -37,6 +37,7 @@ M2-Planet                                       \
     -f lib/mes/mini-write.c                     \
     -f lib/linux/${mes_cpu}-mes-m2/syscall.c    \
     -f include/linux/${mes_cpu}/syscall.h       \
+    -f lib/stub/__raise.c                       \
     -f lib/linux/brk.c                          \
     -f lib/m2/malloc.c                          \
     -f lib/string/memset.c                      \

lib/mes/div.c

@@ -33,7 +33,7 @@ struct ldiv_t
 
 int __raise (int);
 
-#if __TINYC__
+#if __TINYC__ || SYSTEM_LIBC
 #define __raise(x) -1
 #endif
 

lib/stdlib/abort.c

@@ -23,9 +23,10 @@
 void
 abort (void)
 {
-  if (raise (SIGABRT) < 0) { /* could not raise SIGABRT */
+  if (raise (SIGABRT) < 0) /* could not raise SIGABRT */
-    /* Fail in any way possible */
+    {
-    unsigned char* x = (unsigned char*) 0;
+      /* Fail in any way possible */
-    *x = 2;
+      unsigned char* x = (unsigned char*) 0;
-  }
+      *x = 2;
+    }
 }

lib/stub/__raise.c

@@ -0,0 +1,27 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 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/>.
+ */
+
+// CONSTANT SIGABRT 0
+
+int
+__raise (int signum)
+{
+  return -1;
+}

src/builtins.c

@@ -213,6 +213,7 @@ mes_builtins (struct scm *a)            /*:((internal)) */
   a = init_builtin (builtin_type, "module-ref", 2, &module_ref, a);
   a = init_builtin (builtin_type, "module-define!", 3, &module_define_x, a);
   /* src/posix.c */
+  a = init_builtin (builtin_type, "abort", 0, &abort_, a);
   a = init_builtin (builtin_type, "exit", 1, &exit_, a);
   a = init_builtin (builtin_type, "peek-byte", 0, &peek_byte, a);
   a = init_builtin (builtin_type, "read-byte", 0, &read_byte, a);

src/posix.c

@@ -23,6 +23,7 @@
 
 #include <fcntl.h>
 #include <limits.h>
+#include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -33,6 +34,24 @@
 #include <sys/wait.h>
 #include <unistd.h>
 
+#if SYSTEM_LIBC
+#define __raise(x) -1
+#endif
+
+struct scm *
+abort_ ()                   /*:((name . "abort")) */
+{
+  if (g_debug > 0)
+    eputs ("abort!\n");
+  if (__raise (SIGABRT) < 0) /* could not raise SIGABRT */
+    {
+      /* Fail in any way possible */
+      char* x = 0;
+      x[0] = 2;
+    }
+  return cell_unspecified;
+}
+
 struct scm *
 exit_ (struct scm *x)                   /*:((name . "exit")) */
 {