This is a clone of https://github.com/figozhang/runninglinuxkernel_4.0, added as a plugin of Linux Lab.
It aims to speed up the experiment environment building for the RLK4.0 Book.
Before using this RLK4.0 plugin, we need to install Linux Lab at first, please refer to https://tinylab.org/linux-lab.
To save your install time, we can buy a online Linux Lab from https://weidian.com/?userid=335178200
The step-by-step usage is documented below, or you can watch recorded videos in showterm and in showdesk.
$ cd /labs/linux-lab/boards
$ git clone https://github.com/tinyclub/rlk4.0
$ cd /labs/linux-lab
$ make list plugin=rlk4.0
[ rlk4.0/pc ]:
ARCH = x86
CPU ?= i686
LINUX ?= v4.0
ROOTDEV ?= /dev/null
[ rlk4.0/vexpress-a9 ]:
ARCH = arm
CPU ?= cortex-a9
LINUX ?= v4.0
ROOTDEV ?= /dev/null
[ rlk4.0/virt ]:
ARCH = arm64
CPU ?= cortex-a57
LINUX ?= v4.0
ROOTDEV ?= /dev/null
$ make BOARD=rlk4.0/virt
$ make boot
Download linux stable repo to linux-stable/:
$ make kernel-source
Checkout kernel version specified by LINUX in boards/rlk4.0/virt/Makefile:
$ make kernel-checkout
Configure it with the default boards/rlk4.0/virt/linux_v4.0_defconfig:
$ make kernel-defconfig
$ make kernel-menuconfig
Compile it with the pre-installed aarch64-linux-gnu-gcc in /usr/local/bin:
$ make kernel
$ make module-list PLUGIN=rlk4.0
1 ldt
2 mutexlock_test
3 oops_test
4 kmemleak_test
5 rcu_test
6 lock_test
7 slub_test
$ make module m=oops_test
$ make module-install
$ make root-rebuild
$ make boot
(qemu) modprobe oops
Compile the kernel with CONFIG_DEBUG_INFO=y and debug it directly:
$ make debug
Or debug it with two steps, boot it at first:
$ make boot DEBUG=1
Open a new terminal and use gdb to debug it:
$ make env | grep KERNEL_OUTPUT
KERNEL_OUTPUT = /labs/linux-lab/output/aarch64/linux-v4.0-rlk4.0/virt/
$ aarch64-linux-gnu-gdb output/aarch64/linux-v4.0-rlk4.0/virt/vmlinux
...
Reading symbols from output/aarch64/linux-v4.0-rlk4.0/virt/vmlinux...done.
(gdb) b do_fork
Breakpoint 1 at 0xffff8000000d6fa4: file /labs/linux-lab/linux-stable/kernel/fork.c, line 1638.
(gdb) b start_kernel
Breakpoint 2 at 0xffff800000ce6918: file /labs/linux-lab/linux-stable/init/main.c, line 499.
(gdb) target remote :1234
Remote debugging using :1234
0x0000000040000000 in ?? ()
(gdb) c
Continuing.
Breakpoint 2, start_kernel () at /labs/linux-lab/linux-stable/init/main.c:499
499 set_task_stack_end_magic(&init_task);
(gdb) c
Continuing.
Breakpoint 1, do_fork (clone_flags=8389376, stack_start=18446603336232349608, stack_size=0,
parent_tidptr=0x0, child_tidptr=0x0) at /labs/linux-lab/linux-stable/kernel/fork.c:1638
1638 int trace = 0;
Linux Lab allows us to do some simple testings:
Simply boot and poweroff:
$ make test
Don't poweroff after testing (Simply boot):
$ make test TEST_FINISH=echo
Run guest test case:
$ make test TEST_CASE=/tools/ftrace/trace.sh
Reboot the guest system for several times:
$ make test TEST_REBOOT=2
Test a kernel module:
$ make module-test m=oops_test
Test a kernel module and make some targets before testing:
$ make module-test m=oops_test TEST=kernel-checkout,kernel-patch
Put the new tools in system/tools, install tools and rebuild the rootfs:
$ make rootdir # Decompress the rootfs.cpio.gz
$ make root-install
$ make root-rebuild
Note, only vexpress-a9 and virt support this feature.
Host:
$ touch hostshare/test # Create a file in host
$ make boot SHARE=1
Qemu Board:
$ ls /hostshare/ # Access the file in guest
test
$ touch /hostshare/guest_test # Create a file in guest
Download buildroot repo to buildroot/:
$ make root-source
Checkout buildroot version specified by BUILDROOT in boards/rlk4.0/virt/Makefile:
$ make root-checkout
Configure it with the default boards/rlk4.0/virt/buildroot_cortex-a57_defconfig:
$ make root-defconfig
$ make root-menuconfig
Build the rootfs from scratch:
$ make root
Boot with this new rootfs:
$ make boot
If a new rootfs exists, to install tools to the prebuilt rootfs, please pass PBR=1.