x86/oprofile: use unambiguous register names

This is in preparation of eliminating the mis-naming of 64-bit fields
with 32-bit register names (eflags instead of rflags etc).

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/oprofile/backtrace.c
+++ b/xen/arch/x86/oprofile/backtrace.c
@@ -150,7 +150,7 @@ static int valid_hypervisor_stack(const
 void xenoprof_backtrace(struct vcpu *vcpu, const struct cpu_user_regs *regs,
 			unsigned long depth, int mode)
 {
-    const struct frame_head *head = (void *)regs->ebp;
+    const struct frame_head *head = (void *)regs->rbp;
 
     if (mode > 1) {
         while (depth-- && valid_hypervisor_stack(head, regs))
--- a/xen/arch/x86/oprofile/op_model_athlon.c
+++ b/xen/arch/x86/oprofile/op_model_athlon.c
@@ -316,22 +316,20 @@ static int athlon_check_ctrs(unsigned in
 	uint64_t msr_content;
 	int i;
 	int ovf = 0;
-	unsigned long eip = regs->eip;
+	unsigned long eip = regs->rip;
 	int mode = 0;
 	struct vcpu *v = current;
 	struct cpu_user_regs *guest_regs = guest_cpu_user_regs();
 	unsigned int const nr_ctrs = model->num_counters;
 
 	if (!guest_mode(regs) &&
-	    (regs->eip == (unsigned long)svm_stgi_label)) {
+	    (eip == (unsigned long)svm_stgi_label)) {
 		/* SVM guest was running when NMI occurred */
 		ASSERT(is_hvm_vcpu(v));
-		eip = guest_regs->eip;
+		eip = guest_regs->rip;
 		mode = xenoprofile_get_mode(v, guest_regs);
-	} else {
-		eip = regs->eip;
+	} else
 		mode = xenoprofile_get_mode(v, regs);
-	}
 
 	for (i = 0 ; i < nr_ctrs; ++i) {
 		CTR_READ(msr_content, msrs, i);
--- a/xen/arch/x86/oprofile/op_model_p4.c
+++ b/xen/arch/x86/oprofile/op_model_p4.c
@@ -617,7 +617,7 @@ static int p4_check_ctrs(unsigned int co
 	uint64_t msr_content;
 	int i;
 	int ovf = 0;
-	unsigned long eip = regs->eip;
+	unsigned long eip = regs->rip;
 	int mode = xenoprofile_get_mode(current, regs);
 
 	stag = get_stagger();
--- a/xen/arch/x86/oprofile/op_model_ppro.c
+++ b/xen/arch/x86/oprofile/op_model_ppro.c
@@ -135,7 +135,7 @@ static int ppro_check_ctrs(unsigned int
 	u64 val;
 	int i;
 	int ovf = 0;
-	unsigned long eip = regs->eip;
+	unsigned long eip = regs->rip;
 	int mode = xenoprofile_get_mode(current, regs);
 	struct arch_msr_pair *msrs_content = vcpu_vpmu(current)->context;