1 files changed, 51 insertions, 0 deletions
diff --git a/arch/um/kernel/exec.c b/arch/um/kernel/exec.c
new file mode 100644
index 000000000..58938d758
--- /dev/null
+++ b/arch/um/kernel/exec.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ */
+
+#include <linux/stddef.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/ptrace.h>
+#include <linux/sched/mm.h>
+#include <linux/sched/task.h>
+#include <linux/sched/task_stack.h>
+#include <linux/slab.h>
+#include <asm/current.h>
+#include <asm/processor.h>
+#include <linux/uaccess.h>
+#include <as-layout.h>
+#include <mem_user.h>
+#include <registers.h>
+#include <skas.h>
+#include <os.h>
+
+void flush_thread(void)
+{
+	void *data = NULL;
+	int ret;
+
+	arch_flush_thread(&current->thread.arch);
+
+	ret = unmap(&current->mm->context.id, 0, TASK_SIZE, 1, &data);
+	if (ret) {
+		printk(KERN_ERR "flush_thread - clearing address space failed, "
+		       "err = %d\n", ret);
+		force_sig(SIGKILL);
+	}
+	get_safe_registers(current_pt_regs()->regs.gp,
+			   current_pt_regs()->regs.fp);
+
+	__switch_mm(&current->mm->context.id);
+}
+
+void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
+{
+	PT_REGS_IP(regs) = eip;
+	PT_REGS_SP(regs) = esp;
+	clear_thread_flag(TIF_SINGLESTEP);
+#ifdef SUBARCH_EXECVE1
+	SUBARCH_EXECVE1(regs->regs);
+#endif
+}
+EXPORT_SYMBOL(start_thread);