32位gdb可以调试64位二进制文​​件吗？

Question

32位gdb可以调试64位二进制文​​件吗？

Answer 1

上面的答案是不正确的。您需要 64 位调试器来调试 64 位进程。这正是 gdb 在幕后创建 64 位自身副本的原因。

Answer 2

是的。 32 位 gdb 在 Solaris 上可以很好地调试 64 位二进制文​​件，至少在最新版本上是这样。

$ cat /etc/release
                      Oracle Solaris 11 Express snv_151a X86
     Copyright (c) 2010, Oracle and/or its affiliates.  All rights reserved.
                           Assembled 04 November 2010
$ file /usr/bin/gdb
/usr/bin/gdb:   ELF 32-bit LSB executable 80386 Version 1 [FPU], dynamically linked, not stripped, no debugging information available
$ file a 
a:              ELF 64-bit LSB executable AMD64 Version 1, dynamically linked, not stripped
$ gdb a                                 
GNU gdb 6.8
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i386-pc-solaris2.11"...
(gdb) b main
Breakpoint 1 at 0x400e9c: file a.c, line 3.
(gdb) run
Starting program: /tmp/a 

Breakpoint 1, main () at a.c:3
3               printf("hello world !");
(gdb) quit
The program is running.  Exit anyway? (y or n) y
$

然而，如果您仔细观察，就会发现这个 32 位 gdb 在幕后启动了一个 64 位 gdb：

$ truss -f -t execve /usr/bin/gdb a
1793:   execve("/usr/bin/gdb", 0x0804755C, 0x08047568)  argc = 2
1793:   execve("/usr/bin/amd64/gdb", 0x0804755C, 0x08047568)  argc = 2
GNU gdb 6.8
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i386-pc-solaris2.11"...
(gdb)

无论调试的二进制文件是 32 位还是 64 位，它都会执行此操作。

我仍然认为 Solaris 下调试器与进程交互的方式与大小无关，因此从技术上讲，32 位二进制调试器应该能够调试 64 位程序。

64 位 gdb 能够调试32 位和 64 位二进制文​​件，但 32 位 gdb 无法调试 64 位二进制文​​件。这就是你正在经历的。