shell: kernel_service: reorg the commands

[ycsin]

Split the kernel_service.c into multiple subcommand files, each file would register with the L0 kernel cmd (or L1 thread cmd) based on the dependencies in Kconfig/CMakeLists.txt.

This greatly reduces the number of precompiler directives.

---

ROM target - before

kernel_service.c                      3074   4.46%  - 
├── _shell_kernel                       40   0.06%  0x8000ef48 rodata
├── cmd_kernel_cycles                   40   0.06%  0x80001002 text
├── cmd_kernel_reboot_cold              10   0.01%  0x80000ff8 text
├── cmd_kernel_reboot_warm              10   0.01%  0x80000fee text
├── cmd_kernel_sleep                    84   0.12%  0x8000102a text
├── cmd_kernel_thread_list              68   0.10%  0x80000d8e text
├── cmd_kernel_thread_mask_clear       144   0.21%  0x80000c6e text
├── cmd_kernel_thread_mask_disable     174   0.25%  0x80000a82 text
├── cmd_kernel_thread_mask_enable      174   0.25%  0x80000b30 text
├── cmd_kernel_thread_mask_enable_all  144   0.21%  0x80000bde text
├── cmd_kernel_thread_pin              204   0.30%  0x800009b6 text
├── cmd_kernel_thread_stacks           150   0.22%  0x80000f58 text
├── cmd_kernel_thread_unwind           144   0.21%  0x80000cfe text
├── cmd_kernel_uptime                  196   0.28%  0x800008d0 text
├── cmd_kernel_version                  32   0.05%  0x80000896 text
├── print_trace_address                 26   0.04%  0x800008b6 text
├── shell_cmd_kernel                     8   0.01%  0x8000e470 shell_root_cmds_area
├── shell_stack_dump                   116   0.17%  0x8000107e text
├── shell_sub_kernel                   280   0.41%  0x8000ef70 rodata
├── shell_sub_kernel_reboot            120   0.17%  0x8000f088 rodata
├── shell_sub_kernel_thread            240   0.35%  0x8000f100 rodata
├── shell_sub_kernel_thread_mask       200   0.29%  0x8000f1f0 rodata
├── shell_tdata_dump                   390   0.57%  0x80000dd2 text
├── sub_kernel                           8   0.01%  0x8000e4c0 tbss
├── sub_kernel_reboot                    8   0.01%  0x8000e4c8 tbss
├── sub_kernel_thread                    8   0.01%  0x8000e4d0 rodata
├── sub_kernel_thread_mask               8   0.01%  0x8000e4d8 rodata
├── thread_is_valid                     34   0.05%  0x80000994 text
└── thread_valid_cb                     14   0.02%  0x80000888 text

ROM target - this PR

kernel_service                                 3058   4.44%  - 
├── cycles.c                                     80   0.12%  - 
│   ├── cmd_kernel_cycles                        40   0.06%  0x80000888 text
│   └── shell_subcmds_kernel_cycles              40   0.06%  0x8000e4c0 shell_subcmds_area
├── kernel_shell.c                               88   0.13%  - 
│   ├── _shell_kernel                            40   0.06%  0x8000e968 rodata
│   ├── kernel_cmds                              40   0.06%  0x8000e498 shell_subcmds_area
│   └── shell_cmd_kernel                          8   0.01%  0x8000e470 shell_root_cmds_area
├── reboot.c                                    188   0.27%  - 
│   ├── cmd_kernel_reboot_cold                   10   0.01%  0x800009f2 text
│   ├── cmd_kernel_reboot_warm                   10   0.01%  0x800009e8 text
│   ├── shell_sub_kernel_reboot                 120   0.17%  0x8000eb48 rodata
│   ├── shell_subcmds_kernel_reboot              40   0.06%  0x8000e4e8 shell_subcmds_area
│   └── sub_kernel_reboot                         8   0.01%  0x8000e6c8 tbss
├── sleep.c                                     124   0.18%  - 
│   ├── cmd_kernel_sleep                         84   0.12%  0x800008b0 text
│   └── shell_subcmds_kernel_sleep               40   0.06%  0x8000e510 shell_subcmds_area
├── thread                                     2270   3.30%  - 
│   ├── list.c                                  498   0.72%  - 
│   │   ├── cmd_kernel_thread_list               68   0.10%  0x80000a2c text
│   │   ├── shell_subcmds_thread_list            40   0.06%  0x8000e5d8 shell_subcmds_area
│   │   └── shell_tdata_dump                    390   0.57%  0x80000a70 text
│   ├── mask.c                                  884   1.28%  - 
│   │   ├── cmd_kernel_thread_mask_clear        144   0.21%  0x80000de2 text
│   │   ├── cmd_kernel_thread_mask_disable      174   0.25%  0x80000bf6 text
│   │   ├── cmd_kernel_thread_mask_enable       174   0.25%  0x80000ca4 text
│   │   ├── cmd_kernel_thread_mask_enable_all   144   0.21%  0x80000d52 text
│   │   ├── shell_sub_kernel_thread_mask        200   0.29%  0x8000f078 rodata
│   │   ├── shell_subcmds_thread_mask            40   0.06%  0x8000e600 shell_subcmds_area
│   │   └── sub_kernel_thread_mask                8   0.01%  0x8000e6d0 tbss
│   ├── pin.c                                   244   0.35%  - 
│   │   ├── cmd_kernel_thread_pin               204   0.30%  0x80000e72 text
│   │   └── shell_subcmds_thread_pin             40   0.06%  0x8000e628 shell_subcmds_area
│   ├── stacks.c                                306   0.44%  - 
│   │   ├── cmd_kernel_thread_stacks            150   0.22%  0x80000f3e text
│   │   ├── shell_stack_dump                    116   0.17%  0x80000fd4 text
│   │   └── shell_subcmds_thread_stacks          40   0.06%  0x8000e650 shell_subcmds_area
│   ├── thread.c                                128   0.19%  - 
│   │   ├── shell_subcmds_kernel_thread          40   0.06%  0x8000e538 shell_subcmds_area
│   │   ├── sub_kernel_thread                    40   0.06%  0x8000e5b0 shell_subcmds_area
│   │   ├── thread_valid_cb                      14   0.02%  0x800009fc text
│   │   └── z_thread_is_valid                    34   0.05%  0x80000a0a text
│   └── unwind.c                                210   0.31%  - 
│       ├── cmd_kernel_thread_unwind            144   0.21%  0x80001062 text
│       ├── print_trace_address                  26   0.04%  0x80001048 text
│       └── shell_subcmds_thread_unwind          40   0.06%  0x8000e678 shell_subcmds_area
├── uptime.c                                    236   0.34%  - 
│   ├── cmd_kernel_uptime                       196   0.28%  0x80000904 text
│   └── shell_subcmds_kernel_uptime              40   0.06%  0x8000e560 shell_subcmds_area
└── version.c                                    72   0.10%  - 
    ├── cmd_kernel_version                       32   0.05%  0x800009c8 text
    └── shell_subcmds_kernel_version             40   0.06%  0x8000e588 shell_subcmds_area

zephyr.bin size is the same before and after this PR:

west build -b qemu_riscv64_smp -p always zephyr/samples/hello_world -- -DCONFIG_SHELL=y -DCONFIG_BUILD_OUTPUT_BIN=y

-rwxr-xr-x@  1 ycsin  staff    84764 Sep 12 15:53 zephyr.bin

[jakub-uC]

LGTM from a shell perspective, but perhaps a kernel maintainer might want to comment on it?

[ycsin]

Rebased to solve merge conflict

[andyross]

Here because I was summoned, though I'll admit that she'll isn't really my strongest area. This looks like good cleanup though.