Common bochs Debugging commands

Common bochs Debugging commands

Bochs is a very easy-to-use simulator, and there are many commands, but the most common ones include several. Remember that these commands can basically meet debugging requirements.

1. breakpoint operations

(1) set the breakpoint: B physical address

For example, B 0x7c00 sets a breakpoint at the physical address 0x7c00.

(2) query breakpoints already set: info break

 

 

2. Program Execution

(1) execute the program until a breakpoint occurs: c

 

 

(2) One-step execution: S

 

 

(3) execute n commands: Step n

For example, execute three commands: Step 3.

 

 

2. Register value Query

(1) The info r command queries the value of the basic register, for example:

 

 

(2) dump_cpu

This command displays more comprehensive registers than info r, and even the shadow register values are printed out:

 

 

3. Memory Content Query

(1) query the memory of n Bytes starting from an address: XP/nbx physical address

Example: XP/32bx 0x90000 queries 32 bytes starting from 0x90000

 

 

(2) print the content in the current stack: Print-Stack

In the following example: 040803c0 is the linear address of the current running program, and 01ff53c0 is the actual physical address.

 

 

4. disassembly of a memory segment: disassemble start address termination address

For example, disassemble 0x7c3e 0x7c40 disassembles the instruction for this address.