hurd: Add malloc.

* include/gnu/syscall.h (__vm_allocate): New value.
(__vm_allocate): Declare.
* lib/gnu/malloc.c: New file.
* lib/stdlib/malloc.c[__GNU__]: Disable.  See FIXME.
* lib/gnu/vm-allocate.c: New file.
* build-aux/configure-lib.sh (libc_SOURCES): Add it.

build-aux/configure-lib.sh

@@ -162,6 +162,8 @@ lib/gnu/_read.c
 lib/gnu/dir-lookup.c
 lib/gnu/fd-read.c
 lib/gnu/io-read.c
+lib/gnu/malloc.c
+lib/gnu/vm-allocate.c
 lib/stub/access.c
 lib/stub/brk.c
 lib/stub/chmod.c

include/gnu/syscall.h

@@ -34,6 +34,7 @@
 enum
   {
    SYS__task_terminate = 2008,
+   SYS__vm_allocate = 2021,
    SYS__vm_statistics = 2030,
    SYS__task_get_special_port = 2058,
   };
@@ -129,6 +130,7 @@ kern_return_t __syscall_put (mach_port_t port, int sys_call, mach_msg_header_t *
 // mach.defs
 kern_return_t __task_terminate (mach_port_t task);
 kern_return_t __task_get_special_port (mach_port_t task, int which, mach_port_t *port);
+kern_return_t __vm_allocate (mach_port_t task, vm_address_t *address, vm_size_t size, boolean_t anywhere);
 kern_return_t __vm_statistics (mach_port_t task, vm_statistics_data_t *vm_stats);
 
 // process.defs

lib/gnu/malloc.c

@@ -0,0 +1,34 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2019 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 <mes/lib.h>
+#include <gnu/syscall.h>
+#include <mach/mach-init.h>
+
+void *
+malloc (size_t size)
+{
+  vm_address_t where;
+  vm_size_t amount = size;
+  kern_return_t e = __vm_allocate (mach_task_self (), &where, (vm_size_t) amount, 1);
+  if (e)
+    return 0;
+  return (void*) where;
+}

lib/gnu/vm-allocate.c

@@ -0,0 +1,76 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2019 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 <gnu/syscall.h>
+
+struct mach_msg_int_address
+{
+  mach_msg_header_t header;
+  mach_msg_type_t type_one; int one;
+  mach_msg_type_t type_two; vm_address_t two;
+};
+
+struct mach_msg_address_int_int
+{
+  mach_msg_header_t header;
+  mach_msg_type_t type_one; vm_address_t one;
+  mach_msg_type_t type_two; vm_size_t two;
+  mach_msg_type_t type_three; boolean_t three;
+};
+
+const mach_msg_type_t mach_msg_type_boolean =
+  {
+   (unsigned char) MACH_MSG_TYPE_BOOLEAN,    // msgt_name
+   32,                                       // msgt_size
+   1,                                        // msgt_number
+   1,                                        // msgt_inline
+   0,                                        // msgt_longform
+   0,                                        // msgt_deallocate
+   0                                         // msgt_unused
+  };
+
+kern_return_t
+__vm_allocate (mach_port_t task, vm_address_t *address, vm_size_t size, boolean_t anywhere)
+{
+  union message
+  {
+    struct mach_msg_address_int_int request;
+    struct mach_msg_int_address reply;
+  };
+  union message message = {0};
+  message.request.header.msgh_size = sizeof (message.request);
+  message.request.type_one = mach_msg_type_int32;
+  message.request.one = *address;
+  message.request.type_two = mach_msg_type_int32;
+  message.request.two = size;
+  message.request.type_three = mach_msg_type_boolean;
+  message.request.three = anywhere;
+
+  kern_return_t result = __syscall_get (task, SYS__vm_allocate,
+                                        &message.request.header,
+                                        sizeof (message.reply));
+
+  if (message.reply.one != KERN_SUCCESS)
+    return message.reply.one;
+
+  if (result == KERN_SUCCESS)
+    *address = message.reply.two;
+  return result;
+}

lib/gnu/x86-mes-gcc/crt1.c

@@ -37,8 +37,7 @@ _start ()
   __stdin = 0;
   __stdout = 1;
   __stderr = 2;
-  int argc = _hurd_startup_data.arg_count;
-  int r = main (argc, __argv, environ);
+  int r = main (__argc, __argv, environ);
   _exit (r);
   asm ("hlt");
 }

lib/stdlib/malloc.c

@@ -21,6 +21,15 @@
 #include <mes/lib.h>
 #include <string.h>
 
+/* FIXME: We want bin/mes-mescc's x86-linux sha256sum to stay the same.
+   Therfore we cannot remove stdlib/malloc from libc_SOURCES, which is
+   what GNU suggests.
+
+   move stdlib/malloc.c to unix/malloc.c and move it from shared
+   libc_SOURCES to linux-specific list when the checksum of mes.c
+   changes. */
+
+#if !__GNU__
 char *__brk = 0;
 
 void *
@@ -34,3 +43,4 @@ malloc (size_t size)
   __brk += size;
   return p;
 }
+#endif /* !__GNU__ */