1
我有以下CMU的架構實驗室y86-64程序,應該總結一個鏈表的值。在y86程序中獲取ADR錯誤,不知道爲什麼。堆棧似乎設置得很好
# Adam Cooper ac251190
init:
.pos 0x0
irmovq Stack, %rsp # set up stack pointer
irmovq Stack, %rbp # set up base pointer
call Main
halt
# Sample linked list
.align 8
ele1:
.quad 0x00a
.quad ele2
ele2:
.quad 0x0b0
.quad ele3
ele3:
.quad 0xc00
.quad 0
Main:
irmovq ele1, %rax
pushq %rax # Pointer to list pushed to stack
call Sum
ret
Sum:
pushq %rbp # Push %rbp onto the stack
rrmovq %rsp, %rbp
mrmovq 8(%rbp), %rdx # Move ele1 into %rdx
irmovq $0, %rax # Set up a base to add eles to
andq %rdx, %rdx # Is this the end of the list?
je End # If it is, jump to the end
irmovq $8, %rcx # Turn %rcx into a index mover
Loop:
mrmovq (%rdx), %rbx # Move ls into %rbx
addq %rbx, %rax # val += ele
addq %rcx, %rdx # Move to next value in the list
mrmovq (%rdx), %rdx
andq %rdx, %rdx # Are we at the last ele?
jne Loop # If not, go again
End:
popq %rbp # TEAR! DOWN! THE STACK!
ret # Return the original call to Main
.pos 0x400
Stack:
程序在行0x093
這是行
Loop:
mrmovq (%rdx), %rbx
現在,我的帶領下,一個"ADR"
錯誤意味着程序試圖訪問一個地址的文檔,相信與狀態"ADR"
暫停高於0xFFF
,但事實並非如此。該堆棧也似乎已被初始化並正確設置。我使用了與我編寫的其他幾個程序相同的方法,工作得很好。不太確定這裏有什麼問題。