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                # 顯示匯編代碼窗口 ## 例子 #include <stdio.h> void fun1(void) { int i = 0; i++; i = i * 2; printf("%d\n", i); } void fun2(void) { int j = 0; fun1(); j++; j = j * 2; printf("%d\n", j); } int main(void) { fun2(); return 0; } ## 技巧 使用gdb圖形化調試界面時,可以使用“`layout asm`”命令顯示匯編代碼窗口。以調試上面程序為例: ┌───────────────────────────────────────────────────────────────────────────────────────────────┐ >│0x40052b <main+4> callq 0x4004f3 <fun2> │ │0x400530 <main+9> mov $0x0,%eax │ │0x400535 <main+14> leaveq │ │0x400536 <main+15> retq │ │0x400537 nop │ │0x400538 nop │ │0x400539 nop │ │0x40053a nop │ │0x40053b nop │ │0x40053c nop │ │0x40053d nop │ │0x40053e nop │ │0x40053f nop │ │0x400540 <__libc_csu_fini> repz retq │ │0x400542 data16 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1) │ │0x400550 <__libc_csu_init> mov %rbp,-0x28(%rsp) │ └───────────────────────────────────────────────────────────────────────────────────────────────┘ native process 44658 In: main Line: 24 PC: 0x40052b (gdb) start Temporary breakpoint 1 at 0x40052b: file a.c, line 24. Starting program: /home/nan/a Temporary breakpoint 1, main () at a.c:24 (gdb) 可以看到,顯示了當前的程序的匯編代碼。 如果既想顯示源代碼,又想顯示匯編代碼,可以使用“`layout split`”命令: ┌──a.c──────────────────────────────────────────────────────────────────────────────────────────┐ >│24 fun2(); │ │25 return 0; │ │26 } │ │27 │ │28 │ │29 │ │30 │ └───────────────────────────────────────────────────────────────────────────────────────────────┘ >│0x40052b <main+4> callq 0x4004f3 <fun2> │ │0x400530 <main+9> mov $0x0,%eax │ │0x400535 <main+14> leaveq │ │0x400536 <main+15> retq │ │0x400537 nop │ │0x400538 nop │ │0x400539 nop │ │0x40053a nop │ └───────────────────────────────────────────────────────────────────────────────────────────────┘ native process 44658 In: main Line: 24 PC: 0x40052b (gdb) start Temporary breakpoint 1 at 0x40052b: file a.c, line 24. Starting program: /home/nan/a Temporary breakpoint 1, main () at a.c:24 (gdb) 可以看到上面顯示的是源代碼,下面顯示的是匯編代碼。 參見[gdb手冊](https://sourceware.org/gdb/onlinedocs/gdb/TUI-Commands.html). ## 貢獻者 nanxiao
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