1 files changed, 81 insertions, 0 deletions
diff --git a/arch/um/os-Linux/sys-x86_64/registers.c b/arch/um/os-Linux/sys-x86_64/registers.c
new file mode 100644
index 000000000000..6286c974bbeb
--- /dev/null
+++ b/arch/um/os-Linux/sys-x86_64/registers.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2004 PathScale, Inc
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <string.h>
+#include "ptrace_user.h"
+#include "uml-config.h"
+#include "skas_ptregs.h"
+#include "registers.h"
+#include "user.h"
+
+/* These are set once at boot time and not changed thereafter */
+
+static unsigned long exec_regs[HOST_FRAME_SIZE];
+static unsigned long exec_fp_regs[HOST_FP_SIZE];
+
+void init_thread_registers(union uml_pt_regs *to)
+{
+	memcpy(to->skas.regs, exec_regs, sizeof(to->skas.regs));
+	memcpy(to->skas.fp, exec_fp_regs, sizeof(to->skas.fp));
+}
+
+static int move_registers(int pid, int int_op, int fp_op,
+			  union uml_pt_regs *regs)
+{
+	if(ptrace(int_op, pid, 0, regs->skas.regs) < 0)
+		return(-errno);
+
+	if(ptrace(fp_op, pid, 0, regs->skas.fp) < 0)
+		return(-errno);
+
+	return(0);
+}
+
+void save_registers(int pid, union uml_pt_regs *regs)
+{
+	int err;
+
+	err = move_registers(pid, PTRACE_GETREGS, PTRACE_GETFPREGS, regs);
+	if(err)
+		panic("save_registers - saving registers failed, errno = %d\n",
+		      -err);
+}
+
+void restore_registers(int pid, union uml_pt_regs *regs)
+{
+	int err;
+
+	err = move_registers(pid, PTRACE_SETREGS, PTRACE_SETFPREGS, regs);
+	if(err)
+		panic("restore_registers - saving registers failed, "
+		      "errno = %d\n", -err);
+}
+
+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",
+		      err);
+
+	err = ptrace(PTRACE_GETFPREGS, pid, 0, exec_fp_regs);
+	if(err)
+		panic("check_ptrace : PTRACE_GETFPREGS failed, errno = %d",
+		      err);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */