1 files changed, 58 insertions, 0 deletions
diff --git a/arch/um/os-Linux/registers.c b/arch/um/os-Linux/registers.c
new file mode 100644
index 0000000000..b123955be7
--- /dev/null
+++ b/arch/um/os-Linux/registers.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2004 PathScale, Inc
+ * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <sys/ptrace.h>
+#include <sysdep/ptrace.h>
+#include <sysdep/ptrace_user.h>
+#include <registers.h>
+
+int save_registers(int pid, struct uml_pt_regs *regs)
+{
+	int err;
+
+	err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp);
+	if (err < 0)
+		return -errno;
+	return 0;
+}
+
+int restore_pid_registers(int pid, struct uml_pt_regs *regs)
+{
+	int err;
+
+	err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp);
+	if (err < 0)
+		return -errno;
+	return 0;
+}
+
+/* This is set once at boot time and not changed thereafter */
+
+static unsigned long exec_regs[MAX_REG_NR];
+static unsigned long exec_fp_regs[FP_SIZE];
+
+int init_pid_registers(int pid)
+{
+	int err;
+
+	err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
+	if (err < 0)
+		return -errno;
+
+	arch_init_registers(pid);
+	get_fp_registers(pid, exec_fp_regs);
+	return 0;
+}
+
+void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
+{
+	memcpy(regs, exec_regs, sizeof(exec_regs));
+
+	if (fp_regs)
+		memcpy(fp_regs, exec_fp_regs, sizeof(exec_fp_regs));
+}