c - 设置观察点以在 GDB 中输出十六进制列表

Question

我正在使用 GDB 调试 C 程序，并且在变量 uint8_t msg_bin_tst[64]; 上设置了一个观察点。当观察点被触发时，GDB 输出如下内容:

Watchpoint 4: msg_bin_tst
Old value = "@\001\000\067\335\002\033a32c85ba9dda45823be416246cf8b433baa068d7\000\000\000\000\000\000\000\000\000\017\000\000\000(\000\000"
New value = "@\001\000\067\335\002\033a32c85ba9dda45823be416246cf6cf8b433baa068d7\000\000\000\000\000\000\017\000\000\000(\000\000"

这有点难以解释，有没有一种方法可以将输出格式设置为类似print/x，即类似于:

msg_bin_tst = {0x40, 0x1, 0x0, 0x37, 0xdd, 0x2, 0x1b, 0x61, 0x33, 0x32, 0x63, 0x38, 0x35, 0x62, 0x61, 0x39, 0x64, 0x64, 0x61, 0x34, 0x35, 0x38, 0x32, 0x33, 0x62, 0x65, 0x34, 0x31, 0x36, 0x32, 0x34, 0x36, 0x63, 0x66, 0x38, 0x62, 0x34, 0x33, 0x33, 0x62, 0x61, 0x61, 0x30, 0x36, 0x38, 0x64, 0x37, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xf, 0x0, 0x0, 0x0, 0x28, 0x0, 0x0, 0x0}

Answer 1

使用commands 设置命中观察点时的命令，例如:

(gdb) commands 2
Type commands for breakpoint(s) 2, one per line.
End with a line saying just "end".
>print /x msg_bin_tst
>end

2 是观察点的数量。然后当命中观察点时，数组将自动转储。

可以引用gdb手册:https://sourceware.org/gdb/onlinedocs/gdb/Break-Commands.html .