29、树莓派编程：调试、内存访问与ARM汇编指令详解

树莓派编程：调试、内存访问与ARM汇编指令详解

1. 调试会话示例

以下是一个调试会话的示例，展示了如何单步执行程序并显示寄存器内容：

Breakpoint 1 at 0x10074: file t1a.s, line 7.
(gdb) r 1
Starting program: /home/pi/Desktop/t1a 1
Breakpoint 1, _start () at t1a.s:7
7  _start: mov  r0,#23  @ Just three dummy operations for debugging
(gdb) si 1
8          mov  r1,#v1
9          add  r2,r0,r1
11         ldr  r1,=banner  @ Test display function (r1 has address of a string)
12         mov  r2,#15  @ Number of characters to print 13 plus two newlines)
13         mov  r0,#1  @ Tell the OS we want to print on console display
14         mov  r7,#4  @ Tell the OS we want to perform a print operation
15         svc  0  @ Call the operating system to do the printing
Test printing
17         adr