Common configuration methods for using GDB to debug embedded ARM assembler under Linux-Linux Operation and Maintenance-php.cn

Common configuration method for using GDB to debug embedded ARM assembler under Linux

Abstract:
In embedded system development, ARM architecture processors are widely used in various fields. In order to debug embedded ARM assembler, we can use GNU Debugger (GDB). This article will introduce common methods of configuring GDB to debug embedded ARM assembler in a Linux environment and provide code examples.

Install GDB and ARM cross-compilation tool chain
Before starting, we need to install GDB and ARM cross-compilation tool chain on the Linux system. It can be installed through a package manager (such as apt) or downloaded from the official website.
Writing an embedded ARM assembler
First, we need to write a simple embedded ARM assembler for subsequent debugging. The following is a sample program:

.global _start .extern printf .section .data message: .asciz "Hello, World! " .section .text _start: ldr r0, =message bl printf mov r7, #1 swi 0

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The above code first defines the global label_startand the external functionprintf. Then, a stringmessageis defined in the.datasection, andldrandbl## are used in the.textsection. The # directive implements the output of strings. The last two lines of code use themovandswiinstructions to exit the program.

Use the ARM cross-compilation tool chain to compile the above assembler into an executable file. Assuming that the prefix of the cross-compilation tool chain is
arm-none-eabi-, you can use the following command to compile:

$ arm-none-eabi-as -mcpu=cortex-m3 -o program.o program.s $ arm-none-eabi-ld -o program program.o

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where,

-mcpu=cortex-m3Specifies the type of target processor.

Next, we need to configure GDB to debug the executable file generated by compilation. GDB can be started using the following command:

$ gdb

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Then, the executable is loaded into GDB using the following command:

(gdb) file program

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us You also need to configure GDB to connect to the target device for debugging. Connector parameters can be set using the following command:

(gdb) target remote localhost:1234

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where

localhost:1234is the connection address and port number of the target device. This assumes that localhost and the default port number1234are used.

Now, we can start debugging the assembler. The following are some commonly used GDB debugging command examples:

```
(gdb) info registers
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```
(gdb) step
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(gdb) next
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```
(gdb) break main
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(gdb) continue
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```
(gdb) x/16x $sp
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```
(gdb) print $r0
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(gdb) list
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When we have finished debugging the program, we can use the following command to end the debugging session:

```
(gdb) quit
```
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Conclusion:This article introduces the common configuration method of using GDB to debug embedded ARM assembler in Linux environment. First, we installed the GDB and ARM cross-compilation toolchain. Then, a simple embedded ARM assembler was written and compiled using the ARM cross-compilation tool chain. Next, we configured GDB and connected to the target device. Finally, we debugged the assembler using GDB's various debugging commands. By configuring GDB, we can easily debug the embedded ARM assembler and speed up development efficiency.
References:
https://sourceware.org/gdb/onlinedocs/gdb/
- https://www.keil.com/support/man/docs/armclang_intro/armclang_intro_dom1361289859837.htm
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