1 files changed, 113 insertions, 0 deletions
diff --git a/kernel/arch/x86/um/os-Linux/registers.c b/kernel/arch/x86/um/os-Linux/registers.c
new file mode 100644
index 000000000..41bfe84e1
--- /dev/null
+++ b/kernel/arch/x86/um/os-Linux/registers.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2004 PathScale, Inc
+ * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <sys/ptrace.h>
+#ifdef __i386__
+#include <sys/user.h>
+#endif
+#include <longjmp.h>
+#include <sysdep/ptrace_user.h>
+
+int save_fp_registers(int pid, unsigned long *fp_regs)
+{
+	if (ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0)
+		return -errno;
+	return 0;
+}
+
+int restore_fp_registers(int pid, unsigned long *fp_regs)
+{
+	if (ptrace(PTRACE_SETFPREGS, pid, 0, fp_regs) < 0)
+		return -errno;
+	return 0;
+}
+
+#ifdef __i386__
+int have_fpx_regs = 1;
+int save_fpx_registers(int pid, unsigned long *fp_regs)
+{
+	if (ptrace(PTRACE_GETFPXREGS, pid, 0, fp_regs) < 0)
+		return -errno;
+	return 0;
+}
+
+int restore_fpx_registers(int pid, unsigned long *fp_regs)
+{
+	if (ptrace(PTRACE_SETFPXREGS, pid, 0, fp_regs) < 0)
+		return -errno;
+	return 0;
+}
+
+int get_fp_registers(int pid, unsigned long *regs)
+{
+	if (have_fpx_regs)
+		return save_fpx_registers(pid, regs);
+	else
+		return save_fp_registers(pid, regs);
+}
+
+int put_fp_registers(int pid, unsigned long *regs)
+{
+	if (have_fpx_regs)
+		return restore_fpx_registers(pid, regs);
+	else
+		return restore_fp_registers(pid, regs);
+}
+
+void arch_init_registers(int pid)
+{
+	struct user_fpxregs_struct fpx_regs;
+	int err;
+
+	err = ptrace(PTRACE_GETFPXREGS, pid, 0, &fpx_regs);
+	if (!err)
+		return;
+
+	if (errno != EIO)
+		panic("check_ptrace : PTRACE_GETFPXREGS failed, errno = %d",
+		      errno);
+
+	have_fpx_regs = 0;
+}
+#else
+
+int get_fp_registers(int pid, unsigned long *regs)
+{
+	return save_fp_registers(pid, regs);
+}
+
+int put_fp_registers(int pid, unsigned long *regs)
+{
+	return restore_fp_registers(pid, regs);
+}
+
+#endif
+
+unsigned long get_thread_reg(int reg, jmp_buf *buf)
+{
+	switch (reg) {
+#ifdef __i386__
+	case HOST_IP:
+		return buf[0]->__eip;
+	case HOST_SP:
+		return buf[0]->__esp;
+	case HOST_BP:
+		return buf[0]->__ebp;
+#else
+	case HOST_IP:
+		return buf[0]->__rip;
+	case HOST_SP:
+		return buf[0]->__rsp;
+	case HOST_BP:
+		return buf[0]->__rbp;
+#endif
+	default:
+		printk(UM_KERN_ERR "get_thread_regs - unknown register %d\n",
+		       reg);
+		return 0;
+	}
+}