ft2team/ubuntu_dev repository overview

⁠About US

Main Page: https://freetimeteam.org/⁠ Official Website: https://free-time-team.github.io/⁠ Forum: http://www.5ichai.com/phpwind/⁠

⁠Quick Start

If you have any problem, you can feel free comment. Or leave your chat contact skype/wechat/qq etc... on comment.

⁠introduction

Have two users, root and user. user name: root, password: user name: user, password: 123

⁠prepare the envrionment

1. install docker
2. sudo docker pull ft2team/ubuntu_dev
3. mkdir work // create your workspace

⁠linux kernel study

---> build sudo docker run -v /absulote/path/to/work:/home/user/work -it ft2team/ubuntu_dev:latest su - user cd work/kern4.1_arm64_env/linux-4.1.16 make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- O=../out user_defconfig make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- O=../out -j4 Image

---> run cd .. $qemu-system-aarch64 -machine virt -cpu cortex-a57 -machine type=virt -nographic -smp 1 -m 2048 -kernel out/arch/arm64/boot/Image --append "console=ttyAMA0"

---> online debug using gdb

$ip addr # remember the following ip address: 172.17.0.2 ... inet 172.17.0.2/16 scope global eth0

$qemu-system-aarch64 -machine virt -cpu cortex-a57 -machine type=virt -nographic -smp 1 -m 2048 -kernel out/arch/arm64/boot/Image --append "console=ttyAMA0" -s -S

---> start another console type the following commands

$sudo docker run -v /absulote/path/to/work:/home/user/work -it ft2team/ubuntu_dev:latest su - user $cd work/kern4.1_arm64_env/ // start gdb and load vmlinux $ aarch64-linux-gnu-gdb (gdb) file out/vmlinux Reading symbols from /media/disk2/03study/kern4.1_arm64_env/out/vmlinux...done.

(gdb) directory linux-4.1.16/ // read source code Source directories searched: /media/disk2/03study/kern4.1_arm64_env/linux-4.1.16:cdir:cwd

(gdb) target remote 172.17.0.2:1234 # using the ip address which you remembered. // access qemu guest Remote debugging using localhost:1234 0x0000000040000000 in ?? ()

(gdb) break start_kernel Breakpoint 2 at 0xffffffc0007ed5d8: file /media/disk2/03study/kern4.1_arm64_env/linux-4.1.16/init/main.c, line 493. (gdb) c Continuing.

Breakpoint 2, start_kernel () at /media/disk2/03study/kern4.1_arm64_env/linux-4.1.16/init/main.c:493 493 { (gdb) list 488 vmalloc_init(); 489 ioremap_huge_init(); 490 }

(gdb) s 502 set_task_stack_end_magic(&init_task); (gdb) info r x0 0x34d5d91d 886429981 x1 0x40b68000 1085702144 x2 0x40 64 x3 0x3f 63 x4 0xffffffc000ac7000 -274866606080 x5 0xffffffc00081f000 -274869391360 x6 0xffffffc000aca000 -274866593792 x7 0xffffffc000b624a8 -274865970008 x8 0x0 0 x9 0x1124 4388 x10 0x34b5193519 226376627481 x11 0x0 0 x12 0x0 0 x13 0x16 22 x14 0x0 0

dmesg log have no timestamp echo Y > /sys/module/printk/parameters/time