1 files changed, 120 insertions, 0 deletions
diff --git a/libexec/rtld-elf/rtld-libc/rtld_libc.c b/libexec/rtld-elf/rtld-libc/rtld_libc.c
new file mode 100644
index 000000000000..a5371de394e9
--- /dev/null
+++ b/libexec/rtld-elf/rtld-libc/rtld_libc.c
@@ -0,0 +1,120 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright 2019 Alex Richardson <arichardson@FreeBSD.org>
+ *
+ * This software was developed by SRI International and the University of
+ * Cambridge Computer Laboratory (Department of Computer Science and
+ * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
+ * DARPA SSITH research programme.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <assert.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "rtld.h"
+#include "rtld_printf.h"
+#include "rtld_libc.h"
+
+/*
+ * Avoid dependencies from various libc calls on abort(). Since this is only
+ * used for assertions in RTLD, we can just raise SIGABRT directly.
+ */
+void
+abort(void)
+{
+	raise(SIGABRT);
+	__builtin_trap();
+}
+
+static int rtld_errno;
+int *__error(void);
+int *
+__error(void)
+{
+
+	return (&rtld_errno);
+}
+
+/* Avoid dependency on __libc_interposing, use the system call directly. */
+#undef sigprocmask
+int
+sigprocmask(int how, const sigset_t *set, sigset_t *oset)
+{
+
+	return (__sys_sigprocmask(how, set, oset));
+}
+__strong_reference(sigprocmask, __libc_sigprocmask);
+
+#if defined DEBUG || !defined(NDEBUG)
+/* Provide an implementation of __assert that does not pull in fprintf() */
+void
+__assert(const char *func, const char *file, int line, const char *failedexpr)
+{
+
+	if (func == NULL)
+		(void)rtld_fdprintf(STDERR_FILENO,
+		    "Assertion failed: (%s), file %s, line %d.\n", failedexpr,
+		    file, line);
+	else
+		(void)rtld_fdprintf(STDERR_FILENO,
+		    "Assertion failed: (%s), function %s, file %s, line %d.\n",
+		    failedexpr, func, file, line);
+	abort();
+	/* NOTREACHED */
+}
+#endif
+
+/*
+ * Avoid pulling in all of pthreads from getpagesize().
+ * It normally uses libc/gen/auxv.c which pulls in pthread_once().
+ * This relies on init_pagesizes setting page_size so must not be called
+ * before that.
+ */
+int
+getpagesize(void)
+{
+	return (page_size);
+}
+
+int __sys___sysctl(const int *name, u_int namelen, void *oldp,
+    size_t *oldlenp, const void *newp, size_t newlen);
+
+int
+sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp,
+    const void *newp, size_t newlen)
+{
+	int retval;
+
+	assert(name[0] != CTL_USER && "Not supported inside rtld!");
+	retval = __sys___sysctl(name, namelen, oldp, oldlenp, newp, newlen);
+	return (retval);
+}