1 files changed, 57 insertions, 0 deletions
diff --git a/arch/um/os-Linux/registers.c b/arch/um/os-Linux/registers.c
new file mode 100644
index 00000000000..a32ba6ab121
--- /dev/null
+++ b/arch/um/os-Linux/registers.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2004 PathScale, Inc
+ * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <sys/ptrace.h>
+#include "sysdep/ptrace.h"
+#include "user.h"
+
+/* This is set once at boot time and not changed thereafter */
+
+static unsigned long exec_regs[MAX_REG_NR];
+
+void init_thread_registers(struct uml_pt_regs *to)
+{
+	memcpy(to->gp, exec_regs, sizeof(to->gp));
+}
+
+void save_registers(int pid, struct uml_pt_regs *regs)
+{
+	int err;
+
+	err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp);
+	if (err < 0)
+		panic("save_registers - saving registers failed, errno = %d\n",
+		      errno);
+}
+
+void restore_registers(int pid, struct uml_pt_regs *regs)
+{
+	int err;
+
+	err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp);
+	if (err < 0)
+		panic("restore_registers - saving registers failed, "
+		      "errno = %d\n", errno);
+}
+
+void init_registers(int pid)
+{
+	int err;
+
+	err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
+	if (err)
+		panic("check_ptrace : PTRACE_GETREGS failed, errno = %d",
+		      errno);
+
+	arch_init_registers(pid);
+}
+
+void get_safe_registers(unsigned long *regs)
+{
+	memcpy(regs, exec_regs, sizeof(exec_regs));
+}