From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/um/kernel/skas/clone.c | 56 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 arch/um/kernel/skas/clone.c

(limited to 'arch/um/kernel/skas/clone.c')

diff --git a/arch/um/kernel/skas/clone.c b/arch/um/kernel/skas/clone.c
new file mode 100644
index 000000000..289771dad
--- /dev/null
+++ b/arch/um/kernel/skas/clone.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <signal.h>
+#include <sched.h>
+#include <asm/unistd.h>
+#include <sys/time.h>
+#include <as-layout.h>
+#include <ptrace_user.h>
+#include <stub-data.h>
+#include <sysdep/stub.h>
+
+/*
+ * This is in a separate file because it needs to be compiled with any
+ * extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled
+ *
+ * Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize
+ * on some systems.
+ */
+
+void __attribute__ ((__section__ (".__syscall_stub")))
+stub_clone_handler(void)
+{
+	struct stub_data *data = (struct stub_data *) STUB_DATA;
+	long err;
+
+	err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
+			    STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *));
+	if (err != 0)
+		goto out;
+
+	err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
+	if (err)
+		goto out;
+
+	err = stub_syscall3(__NR_setitimer, ITIMER_VIRTUAL,
+			    (long) &data->timer, 0);
+	if (err)
+		goto out;
+
+	remap_stack(data->fd, data->offset);
+	goto done;
+
+ out:
+	/*
+	 * save current result.
+	 * Parent: pid;
+	 * child: retcode of mmap already saved and it jumps around this
+	 * assignment
+	 */
+	data->err = err;
+ done:
+	trap_myself();
+}
-- 
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