一元云购网站建设模块,网站建设投标文件范本,域名需要购买吗,西安网站建设外包服务gdb查看汇编代码的例子
操作步骤
用 gdb 启动可执行文件#xff1a;gdb executable_file在 gdb 中设置断点#xff1a;break function_name 或者 break *memory_address运行程序#xff1a;run当程序停止在断点处时#xff0c;使用 disassemble 命令来查看汇编代码#…gdb查看汇编代码的例子
操作步骤
用 gdb 启动可执行文件gdb executable_file在 gdb 中设置断点break function_name 或者 break *memory_address运行程序run当程序停止在断点处时使用 disassemble 命令来查看汇编代码
查看当前函数的汇编代码disassemble查看某个地址的汇编代码disassemble memory_address查看当前函数某个范围内的汇编代码disassemble start_address,end_address查看当前函数的某个汇编指令的源代码位置list *instruction_address
注意如果您使用的是 Intel 架构的处理器可以在 gdb 中使用 set disassembly-flavor intel 命令来切换汇编代码的格式为 Intel 格式。默认情况下汇编代码是 ATT 格式的。
范例x86
#include stdio.hint add(int a, int b) {return a b;
}int main() {int a 10, b 20;int c add(a, b);printf(The sum of %d and %d is %d\n, a, b, c);return 0;
}
现在可以使用 gdb 工具来查看该程序的汇编代码。以下是一个示例 gdb 会话
$ gdb test
(gdb) break main
Breakpoint 1 at 0x1189: file test.c, line 9.
(gdb) run
Starting program: /path/to/test Breakpoint 1, main () at test.c:9
9 int a 10, b 20;(gdb) disassemble add
Dump of assembler code for function add:0x000000000000112d 0: push %rbp0x000000000000112e 1: mov %rsp,%rbp0x0000000000001131 4: mov %edi,-0x4(%rbp)0x0000000000001134 7: mov %esi,-0x8(%rbp)0x0000000000001137 10: mov -0x8(%rbp),%eax0x000000000000113a 13: add -0x4(%rbp),%eax0x000000000000113d 16: pop %rbp0x000000000000113e 17: retq
End of assembler dump.
(gdb) disassemble main
Dump of assembler code for function main:0x0000000000001189 0: push %rbp0x000000000000118a 1: mov %rsp,%rbp0x000000000000118d 4: sub $0x10,%rsp0x0000000000001191 8: movl $0xa,-0x4(%rbp)0x0000000000001198 15: movl $0x14,-0x8(%rbp)0x000000000000119f 22: mov -0x8(%rbp),%edx0x00000000000011a2 25: mov -0x4(%rbp),%eax0x00000000000011a5 28: mov %edx,%esi0x00000000000011a7 30: mov %eax,%edi0x00000000000011a9 32: callq 0x112d add0x00000000000011ae 37: mov %eax,-0xc(%rbp)0x00000000000011b1 40: mov -0x4(%rbp),%eax
范例arm64
#include stdio.hint add(int a, int b) {return a b;
}int main() {int a 10, b 20;int c add(a, b);printf(The sum of %d and %d is %d\n, a, b, c);return 0;
}
假设将该程序保存为 test.c并使用以下命令将其编译为可执行文件
aarch64-linux-gnu-gcc -g -o test test.c现在可以使用 gdb 工具来查看该程序的汇编代码。以下是一个示例 gdb 会话
$ aarch64-linux-gnu-gdb test
(gdb) break main
Breakpoint 1 at 0x40068c: file test.c, line 9.
(gdb) run
Starting program: /path/to/test Breakpoint 1, main () at test.c:9
9 int a 10, b 20;(gdb) disassemble add
Dump of assembler code for function add:0x0000000000400664 0: stp x29, x30, [sp, #-16]!0x0000000000400668 4: mov x29, sp0x000000000040066c 8: str w0, [sp, #8]0x0000000000400670 12: str w1, [sp, #4]0x0000000000400674 16: ldr w0, [sp, #8]0x0000000000400678 20: ldr w1, [sp, #4]0x000000000040067c 24: add w0, w0, w10x0000000000400680 28: mov sp, x290x0000000000400684 32: ldp x29, x30, [sp], #160x0000000000400688 36: ret
End of assembler dump.
(gdb) disassemble main
Dump of assembler code for function main:0x000000000040068c 0: stp x29, x30, [sp, #-16]!0x0000000000400690 4: mov x29, sp0x0000000000400694 8: mov w1, #200x0000000000400698 12: mov w0, #100x000000000040069c 16: bl 0x400664 add0x00000000004006a0 20: str w0, [sp, #4]0x00000000004006a4 24: ldr w0, [sp, #4]0x00000000004006a8 28: mov w1, #200x00000000004006ac 32: mov w2, #10
