assembly - 为什么我的手臂汇编代码没有在 LLDB 中设置断点

Question

我将首先列出我所做的一切和观察到的行为。

.data

.balign 4
foo:
  .word 0

.balign 4
foo:
    .word 0

/* -- Code section */
.text

/* Ensure function section starts 4 byte aligned */
.balign 4
.global main
main:
    ldr r1, #40
    mov r0, =foo
    str r1, [r0]

    ldr r3, #2
    mov r2, =bar
    str r3, [r2]


    ldr r0, =foo
    ldr r1, =bar
    ldr r2, [r0]
    ldr r3, [r1]
    add r0, r1, r2

    mov r2, #12
    mov r7, #1
    swi 0

然后我像这样编译和链接

$> as -g store01.s -o store01.o
$> ld store01.o -o store01

然后启动lldb：

$> lldb store01

我通过以下方式设置断点：

(lldb) breakpoint set --name _start
(lldb) breakpoint set --address 0x10078

我已经成功查看了使用地址的反汇编

(lldb) disassemble --start-address 0x10078 --end-address 0x10090

但是，当我这样做时

(lldb) process launch

我没有打断点并得到以下信息

Process 20966 launched: 'pathto/store01' (arm)
(lldb) Process 20966 exited with status = 42 (0x0000002a)
/* blank line with cursor blinking on it */

我觉得奇怪的是，字符串“Process 20966 exited ...”被放置在 lldb 命令提示符之后，并且提示符正在等待输入。

调试会话是通过 SSH 到树莓派完成的。

那么，任何人都有任何想法或知道为什么没有击中断点？

---

响应更多信息的请求

$>  lldb store01
(lldb) image lookup -vn _start
1 match found in /somepath/store01:
      Address: store01[0x00010074] (store01...text+0)
      Summary: store01`
       Module: file = "/somepath/store01", arch="arm"
 Compile Unit: id = {0x00000000}, file = "/somepath/store01.s", language = "mipsassem"
LineEntry: [x00010074-0x00010078): /somepath/store01.s:15
Symbol: id = {0x00000001}, range = [0x00010074-0x000200b4)

当我跑步时

(lldb) target modules dump symtab

我看到 _start 在这个符号表中

当我跑

(lldb) image lookup --verbose --address 0x10078

和上面类似，使用 _store` + 4

---

这是我为符号 _start 设置断点的一些更有趣的行为。没有击中断点。我再次尝试使用该地址。没有击中断点。我再次尝试使用_start + 8 的地址。没有命中断点。我删除了前两个断点。断点被击中。

(lldb) breakpoint set --name _start
Breakpoint 1: where = store01` + 4, address = 0x00010078
(lldb) process launch
Process 2983 launched: '/path/store01' (arm)
(lldb) Process 2893 exited with status = 42 (0x0000002a)
breakpoint set --address 0x00010078
Breakpoint 2: where = store01` + 4, address = 0x00010078
(lldb) process launch
Process 2910 launched: '/path/store01' (arm)
(lldb) Process 2910 exited with status = 42 (0x0000002a)
breakpoint set --address 0x0001007c
Breakpoint 3: where = store01` + 8, address = 0x0001007c
(lldb) process launch
Process 2927 launched: '/path/store01' (arm)
(lldb) Process 2910 exited with status = 42 (0x0000002a)
(lldb) breakpoint delete 1 2
2 breakpoints deleted; 0 breakpoint locations disabled.
(lldb) process launch
Process 2944 launched: '/path/store01' (arm)
Process 2944 stopped

这一定是某种形式的不当行为。

标签： assemblyraspberry-piarmbreakpointslldb