# 

 # Scan back through the stack until we hit the currently executing

 # translation block, and find the call return address to that block.

 # 

 # Implementation: iterate back through each stack frame until we find

 # a frame that has a saved %ebp == sh4r (setup by the xlat blocks).

 # The return address is then the stack value immediately before the

 # saved %ebp.

 #

 # At most 8 stack frames are checked, to prevent infinite looping on a

 # corrupt stack.

 .global xlat_get_native_pc

 xlat_get_native_pc:

 	mov %rbp, %rax

 	mov $0x8, %ecx

 	mov $sh4r, %rdx

 frame_loop:

 	test %rax, %rax

 	je frame_not_found

 	cmpq (%rax), %rdx

 	je frame_found

 	sub $0x1, %ecx

 	je frame_not_found

 	movq (%rax), %rax

 	jmp frame_loop

 frame_found:

 	movl 0x4(%rax), %rax

 	ret

 frame_not_found:

 	xor %rax, %rax

 	ret