Part 1: PC Bootstrap

cyl@ubuntu:~$ mkdir ~/6.828
cyl@ubuntu:~$
cyl@ubuntu:~$
cyl@ubuntu:~$ cd ~/6.828

cyl@ubuntu:~/6.828$ git clone https://pdos.csail.mit.edu/6.828/2018/jos.git lab
Cloning into 'lab'...
cyl@ubuntu:~/6.828$ cd lab/

cyl@ubuntu:~/6.828/lab$ make
+ as kern/entry.S
+ cc kern/entrypgdir.c
+ cc kern/init.c
+ cc kern/console.c
+ cc kern/monitor.c
+ cc kern/printf.c
+ cc kern/kdebug.c
+ cc lib/printfmt.c
+ cc lib/readline.c
+ cc lib/string.c
+ ld obj/kern/kernel
ld: warning: section \`.bss\' type changed to PROGBITS
+ as boot/boot.S
+ cc -Os boot/main.c
+ ld boot/boot
boot block is 390 bytes (max 510)
+ mk obj/kern/kernel.img


# run QEMU
cyl@ubuntu:~/6.828/lab$ make qemu

# 如果你是在服务器等其他无图形界面的环境下实验可以执行下面的命令启动
# make qemu-nox 

sed "s/localhost:1234/localhost:26000/" < .gdbinit.tmpl > .gdbinit
qemu-system-i386 -drive file=obj/kern/kernel.img,index=0,media=disk,format=raw -serial mon:stdio -gdbtcp::26000 -D qemu.log
6828 decimal is XXX octal!
entering test_backtrace 5
entering test_backtrace 4
entering test_backtrace 3
entering test_backtrace 2
entering test_backtrace 1
entering test_backtrace 0
leaving test_backtrace 0
leaving test_backtrace 1
leaving test_backtrace 2
leaving test_backtrace 3
leaving test_backtrace 4
leaving test_backtrace 5
Welcome to the JOS kernel monitor!
Type 'help' for a list of commands.
K> help
help - Display this list of commands
kerninfo - Display information about the kernel
K> kerninfo
Special kernel symbols:
  _start                  0010000c (phys)
  entry  f010000c (virt)  0010000c (phys)
  etext  f01019e9 (virt)  001019e9 (phys)
  edata  f0113060 (virt)  00113060 (phys)
  end    f01136a0 (virt)  001136a0 (phys)
Kernel executable memory footprint: 78KB

cyl@ubuntu:~/6.828/lab$ make gdb
gdb -n -x .gdbinit

GNU gdb (Ubuntu 8.1.1-0ubuntu1) 8.1.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".
+ target remote localhost:26000
warning: No executable has been specified and target does not support
determining executable automatically.  Try using the "file" command.
warning: A handler for the OS ABI "GNU/Linux" is not built into this configuration
of GDB.  Attempting to continue with the default i8086 settings.

The target architecture is assumed to be i8086
[f000:fff0]    0xffff0:	ljmp   $0xf000,$0xe05b # GDB对要执行的第一条指令的反汇编
0x0000fff0 in ?? ()
+ symbol-file obj/kern/kernel