# 

# 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