{"id":45444,"date":"2024-01-10T01:23:34","date_gmt":"2023-01-21T01:45:35","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45444-2\/"},"modified":"2024-05-04T17:36:19","modified_gmt":"2024-05-04T09:36:19","slug":"45444-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45444-2\/","title":{"rendered":""},"content":{"rendered":"

kernel-roulette<\/h1>\n

Rust\u3067Linux kernel module\u304c\u66f8\u3051\u308b\u2026\u3002\u5642\u306e\u771f\u76f8\u3092\u7a81\u304d\u6b62\u3081\u308b\u305f\u3081\u3001GitHub\u3078\u3068\u5411\u304b\u3063\u305f\u3002
\n\u30cd\u30bf\u3070\u308c\u3002\u5642\u306f\u672c\u5f53\u3060\u3063\u305f\u3002<\/p>\n

\n

\u307e\u305a\u6700\u521d\u306b\u898b\u3064\u304b\u3063\u305f\u306e\u304c\u3001rust.ko\u3067\u3059\u3002
\n\u5185\u5bb9\u306f\u3001kernel module\u3092\u30ed\u30fc\u30c9\u3059\u308b\u3068\u3001”Hello from Rust!++”\u3092printk\u3067\u51fa\u529b\u3059\u308b\u3001\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002
\n\u305f\u3060\u30013\u5e74\u524d\u304b\u3089\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u65e9\u3005\u306b\u898b\u5207\u308a\u3092\u3064\u3051\u3066\u6b21\u3092\u63a2\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u6b21\u306b\u767a\u898b\u3057\u305f\u306e\u304c\u3001kernel-roulette\u3067\u3057\u305f\u3002
\ncharacter device driver\u3092\u5b9f\u88c5\u3057\u3066\u304a\u308a\u3001\u30c7\u30d0\u30a4\u30b9\u30d5\u30a1\u30a4\u30eb\u3092read\u3059\u308b\u3068\u3001\u4e00\u5b9a\u78ba\u7387\u3067kernel panic\u3092\u8d77\u3053\u3059\u3001\u3068\u3044\u3046driver\u3067\u3057\u305f\u3002
\n\u306a\u3093\u3066\u8ff7\u60d1\u306adriver\u3067\u3057\u3087\u3046\u304b
\n\u3053\u3046\u3044\u3046\u9ad8\u5ea6\u306a\u6280\u8853\u3092\u4f7f\u3063\u3066\u3001\u7121\u99c4\u306a\u3053\u3068\u3059\u308b\u306e\u3001\u597d\u304d\u3067\u3059\u3002
\n\u6700\u7d42\u66f4\u65b0\u65e5\u304c7\u30f6\u6708\u524d\u306a\u306e\u3067\u3001\u30c8\u30e9\u30d6\u30eb\u304c\u3042\u3063\u3066\u3082\u3001\u3053\u308c\u304b\u3089\u306a\u3093\u3068\u304b\u306a\u308a\u305d\u3046\u3067\u3059\u3002<\/p>\n

\u3068\u3044\u3046\u308f\u3051\u3067\u3001\u5c11\u3005\u30c8\u30e9\u30d6\u30eb\u306f\u3042\u3063\u305f\u306e\u3067\u3059\u304c\u3001\u30d3\u30eb\u30c9\u3057\u3066\u52d5\u304b\u3057\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n

\u611f\u60f3\u304b\u3089\u8a00\u3046\u3068\u3001Rust\u3067Linux kernel module\u304c\u66f8\u3051\u308b\u3001\u3068\u3044\u3046\u3088\u308a\u3001Linux kernel module\u304b\u3089Rust\u3092\u547c\u3073\u51fa\u305b\u308b\u3001\u3068\u3044\u3046\u611f\u3058\u3067\u3057\u305f\u3002
\nRust\u3067Linux driver\u3092\u66f8\u3051\u308b\u304b\u3089Happy\uff01\u3068\u3044\u3046\u4e16\u754c\u3067\u306f\u306a\u3044\u3067\u3059\u3002\uff08\u304a\u305d\u3089\u304f\u305d\u3046\u3044\u3046\u4e16\u754c\u306f\u305a\u3063\u3068\u6765\u306a\u3044\u3068\u601d\u3044\u307e\u3059\uff09<\/p>\n

\u305f\u3060\u3001\u7d30\u304b\u3044\u3053\u3068\u306f\u7f6e\u3044\u3066\u304a\u3044\u3066\u3001\u9762\u767d\u3044\u306e\u3067\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n

\u307e\u305a\u3001\u4f55\u306f\u3068\u3082\u3042\u308c\u3001\u52d5\u304b\u3059\u3068\u3069\u3046\u306a\u308b\u304b\u3001\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002
\n\u305d\u306e\u5f8c\u3001\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u89e3\u6790\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

Linux kernel driver\u3084Rust\u306e\u57fa\u790e\u4e8b\u9805\u306b\u3064\u3044\u3066\u306f\u89e3\u8aac\u3057\u307e\u305b\u3093\u3002\u5225\u9014\u53c2\u7167\u3092\u304a\u9858\u3044\u3057\u307e\u3059\u3002<\/p>\n

\u30d3\u30eb\u30c9\uff06\u52d5\u4f5c\u78ba\u8a8d\u74b0\u5883<\/h1>\n
\n
\u9805\u76eeVersion\u306a\u3069Linux kernel4.4.0-137-genericdistributionUbuntu 16.04 (Virtual Box)rustc1.31.0-nightly (77af31408 2018-10-11)<\/div>\n<\/div>\n

\u52d5\u304b\u3057\u3066\u307f\u3088\u3046<\/h1>\n

\u524d\u6e96\u5099<\/h2>\n

kernel-roulette README\u306eDependencies\u306b\u3042\u308b\u901a\u308a\u3001\u4e0b\u8a18\u306e\u524d\u6e96\u5099\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n

Linux kernel headers and build-essential (gcc, make, etc.)
\nNightly Rust (install from https:\/\/rustup.rs)
\nXargo and rust-src
\nDownload the Rust library source with rustup component add rust-src
\nInstall xargo with cargo install xargo<\/p><\/blockquote>\n

\u30d3\u30eb\u30c9<\/h2>\n

\u30ec\u30dd\u30b8\u30c8\u30ea\u3092clone\u3057\u3066\u3001patch\u3092\u5f53\u3066\u307e\u3059\u3002<\/p>\n

$ git clone https:\/\/github.com\/souvik1997\/kernel-roulette.git\r\n$ cd kernel-roulette\r\n$ wget https:\/\/raw.githubusercontent.com\/tomoyuki-nakabayashi\/blogs\/master\/Rust\/kernel-roulette\/0001-fix-build-error-in-the-latest-nightly-rust.patch\r\n$ patch -p1 < 0001-fix-build-error-in-the-latest-nightly-rust.patch\r\n<\/code><\/pre>\n
README\u306eBuilding\u306b\u5f93\u3063\u3066\u624b\u9806\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002
\n\u4ee5\u4e0b\u3001\u5c11\u3057\u5197\u9577\u306b\u66f8\u304d\u307e\u3059\u306e\u3067\u3001\u624b\u3063\u53d6\u308a\u65e9\u304f\u52d5\u304b\u3057\u305f\u3044\u65b9\u306f\u3001README\u306e\u65b9\u3092\u3054\u89a7\u4e0b\u3055\u3044\u3002<\/p>\n
kernel module\u3092\u30d3\u30eb\u30c9\u3057\u307e\u3059\u3002build\/roullete.ko\u304c\u751f\u6210\u3055\u308c\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n
$ make\r\n$ ls build\/\r\n...  roulette.ko  ...\r\n<\/code><\/pre>\n
\u3044\u3088\u3044\u3088\u3001\u7dca\u5f35\u306e\u77ac\u9593\u3067\u3059\u3002kernel module\u3092\u30ed\u30fc\u30c9\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
$ sudo insmod build\/roullete.ko\r\n<\/code><\/pre>\n
\u30ed\u30fc\u30c9\u3067\u304d\u3061\u3083\u3044\u307e\u3059\uff01
\n\u3061\u3083\u3093\u3068\u30ed\u30fc\u30c9\u3055\u308c\u3066\u3044\u308b\u304b\u3001\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
$ lsmod\r\nModule                  Size  Used by\r\nroulette              106496  0\r\n<\/code><\/pre>\n
\u304a\u308b\u3084\u3093\uff01
\ndmesg\u306broulette driver\u304c\u30ed\u30b0\u3092\u51fa\u529b\u3059\u308b\u306e\u3067\u3001\u78ba\u8a8d\u3057\u307e\u3059\u3002Panic\u3059\u308b\u78ba\u7387\u306f1\/100\u306e\u3088\u3046\u3067\u3059\uff01\u307b\u3068\u3093\u3069\u6b7b\u306a\u306a\u3044\u3067\u3059\u306d\uff01<\/p>\n
$ dmesg | tail -n 10\r\n...\r\n[16837.958611] Registered kernel-roulette with major device number 246\r\n[16837.958613] Run \/bin\/mknod \/dev\/kernel-roulette c 246 0\r\n[16838.468004] Panic probability: 1\/100\r\n<\/code><\/pre>\n
roulette driver\u306e\u6307\u793a\u901a\u308a\u3001\u30ad\u30e3\u30e9\u30af\u30bf\u30c7\u30d0\u30a4\u30b9\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n
$ sudo \/bin\/mknod \/dev\/kernel-roulette c 246 0\r\n<\/code><\/pre>\n
\u4f5c\u6210\u3057\u305f\u30c7\u30d0\u30a4\u30b9\u30d5\u30a1\u30a4\u30eb\u3092read\u3059\u308b\u3068\u30011\/100\u306e\u78ba\u7387\u3067\u6b7b\u306b\u307e\u3059\uff01
\ncat\u3057\u3066\u3001\u305d\u306e\u6642\u304c\u6765\u308b\u306e\u3092\u5f85\u3061\u307e\u3059\u3002<\/p>\n
$ cat \/dev\/kernel-roulette\r\nSurvived... sampled value is 79, which is >= 1\r\n$ cat \/dev\/kernel-roulette\r\nSurvived... sampled value is 1, which is >= 1\r\n<\/code><\/pre>\n
\u6b7b\u306d\u306a\u3044\uff01
\n\u6b7b\u306c\u78ba\u7387\u306f\u3001driver\u30ed\u30fc\u30c9\u6642\u306b\u30e9\u30f3\u30c0\u30e0\u3067\u6c7a\u5b9a\u3055\u308c\u308b\u306e\u3067\u3001\u9762\u5012\u306a\u306e\u3067\u30ed\u30fc\u30c9\u3057\u76f4\u3057\u307e\u3059\u3002<\/p>\n
$ sudo rmmod build\/roulette.ko\r\n$ sudo insmod build\/roulette.ko\r\n<\/code><\/pre>\n
\u3055\u3066\u3002<\/p>\n
$ dmseg | tail -n 10\r\n...\r\n[17574.935478] Registered kernel-roulette with major device number 246\r\n[17574.935481] Run \/bin\/mknod \/dev\/kernel-roulette c 246 0\r\n[17575.447283] Panic probability: 49\/100\r\n<\/code><\/pre>\n
\u4eca\u5ea6\u306f\u3059\u3050\u6b7b\u306d\u305d\u3046\u3067\u3059\u306d\u3002<\/p>\n
$ cat \/dev\/kernel-roulette\r\nSurvived... sampled value is 86, which is >= 49\r\n$ cat \/dev\/kernel-roulette\r\nSegmentation fault\r\n<\/code><\/pre>\n
\u304a\u30012\u56de\u76ee\u3067\u30bb\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u30d5\u30a9\u30fc\u30eb\u30c8\u304c\u767a\u751f\u3057\u307e\u3057\u305f\u3002\u4f55\u304c\u8d77\u3053\u3063\u3066\u3044\u308b\u304b\u3001dmesg\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
$ dmesg | tail -n 100\r\n[17633.158768] Rust panic @ src\/roulette.rs:33\r\n[17633.158774] Boom!\r\n[17633.158793] ------------[ cut here ]------------\r\n[17633.158807] Kernel BUG at ffffffffc04bb24e [verbose debug info unavailable]\r\n[17633.158822] invalid opcode: 0000 [#1] SMP \r\n# \u30c8\u30ec\u30fc\u30b9\u7701\u7565\r\n[17633.172695] fbcon_switch: detected unhandled fb_set_par error, error code -16\r\n[17633.173673] fbcon_switch: detected unhandled fb_set_par error, error code -16\r\n[17633.174673] ---[ end trace ff2742f73b763c6d ]---\r\n<\/code><\/pre>\n
\u307e\u305aRust\u3067panic\u304c\u767a\u751f\u3057\u3066\u3044\u3066\u3001\u305d\u306e\u5f8c\u306f\u3001\u304a\u306a\u3058\u307f\u306eLinux kernel\u306e\u30c8\u30ec\u30fc\u30b9\u60c5\u5831\u3067\u3059\u3002
\nKernel\u306eBUG()\u304c\u547c\u3073\u51fa\u3055\u308c\u3066\u3001invalid opcode\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n
kernel-roullete\u4f5c\u8005\u306e\u6069\u60c5\u3067\u3001panic()\u3067\u306f\u306a\u304f\u3001BUG()\u3092\u547c\u3076\u3088\u3046\u306b\u3057\u3066\u304f\u308c\u3066\u3044\u308b\u305f\u3081\u3001Kernel\u304cpanic\u3057\u3066\u30b7\u30b9\u30c6\u30e0\u304c\u6b62\u307e\u308b\u3088\u3046\u306a\u4e8b\u614b\u306f\u767a\u751f\u3057\u307e\u305b\u3093\u3002<\/p>\n
\u3061\u306a\u307f\u306b\u3001\u3053\u306e\u5f8c\u3001roullete driver\u3092rmmod\u3067\u304d\u306a\u304f\u306a\u308a\u307e\u3059\u3002
\n\u539f\u56e0\u306f\u89e3\u660e\u3067\u304d\u3066\u3044\u306a\u3044\u3067\u3059\u3002<\/p>\n
$ sudo rmmod roulette\r\nrmmod: ERROR: Module roulette is in use\r\n<\/code><\/pre>\n
\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u89e3\u6790<\/h1>\n
\u3055\u3066\u3001Linux kernel driver\u306e\u4e00\u90e8\u3068\u3057\u3066\u3001Rust\u3092\u4f7f\u3046\u306b\u306f\u3069\u306e\u3088\u3046\u306a\u30c8\u30ea\u30c3\u30af\u304c\u5fc5\u8981\u306a\u306e\u3067\u3057\u3087\u3046\u304b\uff1f
\n\u3053\u3053\u307e\u3067\u3067\u52d5\u4f5c\u3092\u78ba\u8a8d\u3057\u305fkernel-roulette\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u89e3\u6790\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002
\n\u30bd\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\u3084Makefile\u306b\u4e01\u5be7\u306b\u30b3\u30e1\u30f3\u30c8\u304c\u6dfb\u3048\u3089\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u975e\u5e38\u306b\u89e3\u6790\u3057\u3084\u3059\u3044\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3067\u3057\u305f\u3002\u4f5c\u8005\u306e\u6280\u8853\u30ec\u30d9\u30eb\u306e\u9ad8\u3055\u304c\u4f3a\u3048\u307e\u3059\u3002
\n\u7d39\u4ecb\u3059\u308b\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306f\u30011.31.0-nightly\u3067\u30d3\u30eb\u30c9\u3067\u304d\u308b\u3088\u3046\u306b\u4fee\u6b63\u3092\u52a0\u3048\u305f\u3082\u306e\u3067\u3059\u3002<\/p>\n
\u69cb\u6210<\/h2>\n
\u307e\u305a\u306f\u3001\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u69cb\u6210\u304b\u3089\u5168\u4f53\u50cf\u3092\u628a\u63e1\u3057\u3066\u3044\u304d\u307e\u3059\u3002shim.c\u3068kbuild.mk\u304c\u3042\u308b\u4ee5\u5916\u306f\u3001\u666e\u901a\u306eRust\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3001\u3068\u3044\u3046\u611f\u3058\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n
$ tree .\r\n.\r\n\u251c\u2500\u2500 Cargo.lock\r\n\u251c\u2500\u2500 Cargo.toml\r\n\u251c\u2500\u2500 kbuild.mk\r\n\u251c\u2500\u2500 LICENSE.txt\r\n\u251c\u2500\u2500 Makefile\r\n\u251c\u2500\u2500 README.md\r\n\u251c\u2500\u2500 src\r\n\u2502   \u251c\u2500\u2500 io\r\n\u2502   \u2502   \u2514\u2500\u2500 mod.rs\r\n\u2502   \u251c\u2500\u2500 lang.rs\r\n\u2502   \u251c\u2500\u2500 lib.rs\r\n\u2502   \u251c\u2500\u2500 mem\r\n\u2502   \u2502   \u2514\u2500\u2500 mod.rs\r\n\u2502   \u251c\u2500\u2500 roulette.rs\r\n\u2502   \u2514\u2500\u2500 shim.c\r\n\u251c\u2500\u2500 x86_64-unknown-none-gnu.json\r\n\u2514\u2500\u2500 Xargo.toml\r\n\r\n3 directories, 14 files\r\n<\/code><\/pre>\n
Cargo.toml\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
[package]<\/span>\r\nname<\/span> =<\/span> \"kernel-roulette\"<\/span>\r\nversion<\/span> =<\/span> \"0.1.0\"<\/span>\r\nauthors<\/span> =<\/span> [<\/span>\"Souvik Banerjee <souvik@souvik.me>\"<\/span>]<\/span>\r\n\r\n[lib]<\/span>\r\nname<\/span> =<\/span> \"roulette\"<\/span>\r\ncrate-type<\/span> =<\/span> [\"staticlib\"]<\/span>\r\n\r\n[dependencies]<\/span>\r\nlazy_static<\/span> =<\/span> {<\/span> version<\/span> =<\/span> \"1.0.0\"<\/span>,<\/span> features<\/span> =<\/span> [\"spin_no_std\"]<\/span> }<\/span>\r\nspin<\/span> =<\/span> \"0.4.9\"<\/span>\r\nrand<\/span> =<\/span> {<\/span> version<\/span> =<\/span> \"0.4.2\"<\/span>,<\/span> default-features<\/span> =<\/span> false<\/span> }<\/span>\r\nrlibc<\/span> =<\/span> \"1.0\"<\/span>\r\n<\/code><\/pre>\n
crate-type\u304cstaticlib\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306fRust\u306e\u30a2\u30fc\u30ab\u30a4\u30d6\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u3063\u3066\u3001C\u8a00\u8a9e\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d5\u30a1\u30a4\u30eb\u3068\u30ea\u30f3\u30af\u3059\u308b\u30a2\u30ec\u3067\u3059\u306d\u3001\u304d\u3063\u3068\u3002
\n\u691c\u8a0e\u304c\u3064\u3044\u305f\u3068\u3053\u308d\u3067\u3001Makefile\u3092\u898b\u307e\u3057\u3087\u3046\u3002kernel module\u540d\u306froulette\u3067\u3059\u3002<\/p>\n
# Configuration that will be passed to sub-make\r\n<\/span>\r\n# Name of the kernel module\r\n<\/span>export <\/span>KERNEL_MODULE<\/span> :=<\/span> roulette\r\n\r\n# Path to Linux kernel headers\r\n<\/span>export <\/span>KERNEL_BUILD_PATH<\/span> :=<\/span> \/lib\/modules\/$(<\/span>shell<\/span> uname<\/span> -r<\/span>)<\/span>\/build\r\n\r\n# Find all C and Rust source files\r\n<\/span>export <\/span>C_FILES<\/span> :=<\/span> $(<\/span>shell<\/span> find src\/ -type<\/span> f -name<\/span> \"*.c\"<\/span>)<\/span>\r\nexport <\/span>RUST_FILES<\/span> :=<\/span> $(<\/span>shell<\/span> find src\/ -type<\/span> f -name<\/span> \"*.rs\"<\/span>)<\/span> Cargo.toml Cargo.lock\r\n\r\n# Define the architecture; this will be used for the LLVM target specification\r\n<\/span>export <\/span>UTS_MACHINE<\/span> =<\/span> x86_64\r\n\r\n# The Rust compiler and cross-compiler\r\n<\/span>export <\/span>CARGO<\/span>=<\/span>cargo\r\nexport <\/span>XARGO<\/span>=<\/span>xargo\r\n\r\n# A JSON file specifying an LLVM target\r\n<\/span>export <\/span>LLVM_TARGET_SPEC<\/span>=<\/span>$(UTS_MACHINE)<\/span>-unknown-none-gnu<\/span>.json\r\n\r\n# Top-level project directory\r\n<\/span>export <\/span>BASE_DIR<\/span> :=<\/span> $(<\/span>patsubst<\/span> %\/,%,$(<\/span>dir<\/span> $(<\/span>abspath<\/span> $(<\/span>lastword<\/span> $(MAKEFILE_LIST)<\/span>))))<\/span>\r\n\r\n# The build directory\r\n<\/span>export <\/span>BUILD_DIR<\/span> :=<\/span> build\r\n\r\n# The Makefile that is copied to $(BUILD_DIR)\r\n<\/span>export <\/span>KBUILD<\/span> :=<\/span> kbuild.mk\r\n\r\nall<\/span>:<\/span> $(BUILD_DIR)\/Makefile Makefile<\/span>\r\n# The kbuild makefile has been copied to $(BUILD_DIR), so now we can invoke kbuild from\r\n# the kernel headers.\r\n<\/span>    $(MAKE)<\/span> -C<\/span> \"$(KERNEL_BUILD_PATH)\"<\/span> M<\/span>=<\/span>\"<\/span>$(BASE_DIR)<\/span>\/<\/span>$(BUILD_DIR)<\/span>\"<\/span> modules\r\n\r\n$(BUILD_DIR)\/Makefile <\/span>:<\/span> $(KBUILD)<\/span>\r\n    @mkdir<\/span> -p<\/span> \"${BUILD_DIR}\/src\"<\/span>\r\n    cp<\/span> \"$(KBUILD)\"<\/span> \"$(BUILD_DIR)\/Makefile\"<\/span>\r\n\r\nclean<\/span>:<\/span>\r\n# cleanup is really simple, we just blow away the $(BUILD_DIR) and call `xargo clean`\r\n<\/span>    rm<\/span> -rf<\/span> \"$(BUILD_DIR)\"<\/span>\r\n    xargo<\/span> clean<\/span>\r\n<\/code><\/pre>\n
kbuild.mk\u3092Makefile\u306b\u30ea\u30cd\u30fc\u30e0\u3057\u305f\u4e0a\u3067\u3001build\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u79fb\u52d5\u3057\u3066\u3001kbuild.mk\u3092make\u30b3\u30de\u30f3\u30c9\u3067\u53e9\u3044\u3066\u3044\u307e\u3059\u3002
\nkbuild\u3067\u5f15\u304d\u7d99\u3050\u74b0\u5883\u5909\u6570\u3082\u591a\u6570\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u306d\u3002
\nkbuild.mk\u3092\u898b\u3066\u307f\u307e\u3059\u3002<\/p>\n
# Define the Rust target. Xargo will create an ar archive file with the\r\n# following name in the target folder\r\n<\/span>RUST_TARGET<\/span> :=<\/span> lib$(KERNEL_MODULE)<\/span>.a\r\n\r\n# Enumerate the object files that the C files will compile to\r\n<\/span>C_OBJECTS<\/span> :=<\/span> $(<\/span>patsubst<\/span> %.c,%.o,$(C_FILES)<\/span>)<\/span>\r\n\r\n# Tell kbuild which files to build\r\n<\/span>obj-m<\/span> :=<\/span> $(KERNEL_MODULE)<\/span>.o\r\n\r\n# Tell kbuild where the source files are\r\n<\/span>src<\/span> :=<\/span> $(BASE_DIR)<\/span>\r\n\r\n# The kernel module will be linked from the C object files and the Rust archive\r\n# The order is important: C objects must come first\r\n<\/span>$(KERNEL_MODULE)-objs<\/span> :=<\/span> $(C_OBJECTS)<\/span> $(RUST_TARGET)<\/span>\r\n\r\n# Strip unused symbols from the input object file\r\n<\/span>EXTRA_LDFLAGS<\/span> +=<\/span> --gc-sections<\/span> --entry<\/span>=<\/span>init_module --undefined<\/span>=<\/span>cleanup_module\r\nEXTRA_LDFLAGS<\/span> +=<\/span> $(<\/span>if<\/span> $(RELEASE)<\/span>,--strip-all)<\/span>\r\n\r\n# Fix file paths (since this script will be run from the kbuild's working directory)\r\n<\/span>C_FILES<\/span>    :=<\/span> $(<\/span>foreach<\/span> filepath,$(C_FILES)<\/span>   ,$(BASE_DIR)<\/span>\/$(filepath)<\/span>)<\/span>\r\nRUST_FILES<\/span> :=<\/span> $(<\/span>foreach<\/span> filepath,$(RUST_FILES)<\/span>,$(BASE_DIR)<\/span>\/$(filepath)<\/span>)<\/span>\r\nLLVM_TARGET_SPEC<\/span> :=<\/span> $(<\/span>foreach<\/span> filepath,$(LLVM_TARGET_SPEC)<\/span>,$(BASE_DIR)<\/span>\/$(filepath)<\/span>)<\/span>\r\n\r\n# Determine target directory of cargo's module build\r\n<\/span>CARGO_BUILD_DIR<\/span> :=<\/span> $(BASE_DIR)<\/span>\/target\/$(UTS_MACHINE)<\/span>-unknown-none-gnu<\/span>\/$(<\/span>if<\/span> $(RELEASE)<\/span>,release,debug)<\/span>\r\n\r\n$(obj)\/$(RUST_TARGET)<\/span>:<\/span> $(RUST_FILES) $(LLVM_TARGET_SPEC) $(BASE_DIR)\/$(KBUILD)<\/span>\r\n# We set RUST_TARGET_PATH because of a bug in cargo\/xargo\/rustc: the --target flag is relative to the current working\r\n# directory but subsequent invokations of cargo\/xargo\/rustc might change their working directory. Setting\r\n# RUST_TARGET_PATH ensures that the compiler can find the LLVM target specification.\r\n# We also have to `cd` into $(BASE_DIR) since we are currently in the kernel headers directory.\r\n<\/span>    (cd<\/span> $(BASE_DIR);<\/span> env<\/span> RUST_TARGET_PATH<\/span>=<\/span>$(BASE_DIR)<\/span> $(XARGO)<\/span> rustc $(<\/span>if<\/span> $(RELEASE)<\/span>,--release)<\/span> $(<\/span>if<\/span> $(VERBOSE)<\/span>,--verbose)<\/span> --target<\/span> $(UTS_MACHINE)<\/span>-unknown-none-gnu<\/span> --<\/span> -C<\/span> code-model=<\/span>kernel -C<\/span> relocation-model=<\/span>static -C<\/span> panic<\/span>=<\/span>abort)<\/span>\r\n# After the archive is compiled, copy it to the build directory\r\n<\/span>    cp<\/span> \"$(CARGO_BUILD_DIR)\/$(RUST_TARGET)\"<\/span> $(obj)<\/span>\r\n\r\n$(obj)\/%.c <\/span>:<\/span> $(BASE_DIR)\/%.c $(BASE_DIR)\/$(KBUILD)<\/span>\r\n# KBUILD_CFLAGS is automatically generated by kbuild\r\n<\/span>    $(CC)<\/span> $(KBUILD_CFLAGS)<\/span> -c<\/span> $(BASE_DIR)\/$*.c<\/span> -o<\/span> $*.o<\/span>\r\n<\/code><\/pre>\n
\u305d\u3053\u305d\u3053\u30dc\u30ea\u30e5\u30fc\u30e0\u304c\u3042\u308b\u306e\u3067\u3059\u304c\u3001\u4e0b\u3092\u898b\u308b\u3068\u3001\u5148\u307b\u3069\u306e\u4e88\u6e2c\u304c\u7684\u4e2d\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n
# The kernel module will be linked from the C object files and the Rust archive\r\n# The order is important: C objects must come first\r\n<\/span>$(KERNEL_MODULE)-objs<\/span> :=<\/span> $(C_OBJECTS)<\/span> $(RUST_TARGET)<\/span>\r\n<\/code><\/pre>\n
kernel module\u3092\u4f5c\u308b\u305f\u3081\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d5\u30a1\u30a4\u30eb\u306f\u3001C\u8a00\u8a9e\u3068Rust\u3001\u305d\u308c\u305e\u308c\u500b\u5225\u3067\u4f5c\u3089\u308c\u3066\u3044\u307e\u3059\u3002
\nC\u8a00\u8a9e\u3001\u666e\u901a\u306bkernel module\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d5\u30a1\u30a4\u30eb\u4f5c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
$(obj)\/%.c <\/span>:<\/span> $(BASE_DIR)\/%.c $(BASE_DIR)\/$(KBUILD)<\/span>\r\n# KBUILD_CFLAGS is automatically generated by kbuild\r\n<\/span>    $(CC)<\/span> $(KBUILD_CFLAGS)<\/span> -c<\/span> $(BASE_DIR)\/$*.c<\/span> -o<\/span> $*.o<\/span>\r\n<\/code><\/pre>\n
Rust\u3001relocation-model\u3092static\u306b\u3059\u308b\u3001panic\u3092abort\u306b\u3059\u308b\u3001\u4ee5\u5916\u306f\u666e\u901a\u306e\u30af\u30ed\u30b9\u30d3\u30eb\u30c9\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n
    (cd<\/span> $(BASE_DIR);<\/span> env<\/span> RUST_TARGET_PATH<\/span>=<\/span>$(BASE_DIR)<\/span> $(XARGO)<\/span> rustc $(<\/span>if<\/span> $(RELEASE)<\/span>,--release)<\/span> $(<\/span>if<\/span> $(VERBOSE)<\/span>,--verbose)<\/span> --target<\/span> $(UTS_MACHINE)<\/span>-unknown-none-gnu<\/span> --<\/span> -C<\/span> code-model=<\/span>kernel -C<\/span> relocation-model=<\/span>static -C<\/span> panic<\/span>=<\/span>abort)<\/span>\r\n<\/code><\/pre>\n
Rust\u3068C\u8a00\u8a9e\u30bd\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\u306e\u69cb\u6210\u3092\u3056\u3063\u3068\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u251c\u2500\u2500 src\r\n\u2502   \u251c\u2500\u2500 io\r\n\u2502   \u2502   \u2514\u2500\u2500 mod.rs\r\n\u2502   \u251c\u2500\u2500 lang.rs\r\n\u2502   \u251c\u2500\u2500 lib.rs\r\n\u2502   \u251c\u2500\u2500 mem\r\n\u2502   \u2502   \u2514\u2500\u2500 mod.rs\r\n\u2502   \u251c\u2500\u2500 roulette.rs\r\n\u2502   \u2514\u2500\u2500 shim.c\r\n<\/code><\/pre>\n
\n
\u30d5\u30a1\u30a4\u30eb\u8aac\u660eshim.cLinux kernel driver\u3002init()\u3084open()\u3067Rust\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059io\/mod.rsprintk\u306e\u30e9\u30c3\u30d1\u30fc\u3067print!\u30de\u30af\u30ed\u3092\u5b9a\u7fa9mem\/mod.rskmalloc\u306e\u30e9\u30c3\u30d1\u30fc\u3067\u30d2\u30fc\u30d7\u30a2\u30ed\u30b1\u30fc\u30bf\u3092\u5b9f\u88c5lang.rspanic_handler\u304a\u3088\u3073alloc_error_handler\u3092\u5b9a\u7fa9lib.rsinit(), exit()\u3067\u547c\u3070\u308c\u308b\u95a2\u6570\u3092\u5b9a\u7fa9roulette.rs\u4e00\u5b9a\u78ba\u7387\u3067panic\u3059\u308b\u51e6\u7406\u3092\u5b9a\u7fa9<\/div>\n<\/div>\n
\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9<\/h2>\n
\u3067\u306f\u3001\u30b3\u30fc\u30c9\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u521d\u671f\u5316\/\u7d42\u4e86\u51e6\u7406<\/h3>\n
driver\u30ed\u30fc\u30c9<\/h4>\n
\u307e\u305a\u306f\u3001\u521d\u671f\u5316\u3092\u8ffd\u3063\u3066\u3044\u304d\u307e\u3059\u3002
\nkernel driver\u306e\u30a8\u30f3\u30c8\u30ea\u30dd\u30a4\u30f3\u30c8\u306a\u306e\u3067\u3001C\u8a00\u8a9e\u304b\u3089\u3067\u3059\u3002
\n\u6700\u5f8c\u306e\u4e00\u884c\u4ee5\u5916\u306f\u3001\u666e\u901a\u306ekernel driver\u3067\u3059\u3002
\n\u30ad\u30e3\u30e9\u30af\u30bf\u30c7\u30d0\u30a4\u30b9\u3092\u767b\u9332\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u5f8c\u307b\u3069\u6539\u3081\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n
\/*\r\n * The entry points in C\r\n *\/<\/span>\r\nstatic<\/span> int<\/span> _mod_init<\/span>(<\/span>void<\/span>)<\/span> {<\/span>\r\n\r\n  \/\/ Register a character device<\/span>\r\n  rl_dev_major_num<\/span> =<\/span> register_chrdev<\/span>(<\/span>0<\/span> \/* allocate a major number *\/<\/span>,<\/span> rl_device_name<\/span>,<\/span> &<\/span>rl_driver_fops<\/span>);<\/span>\r\n\r\n  if<\/span> (<\/span>rl_dev_major_num<\/span> <<\/span> 0<\/span>)<\/span> {<\/span>\r\n    printk<\/span>(<\/span>KERN_ALERT<\/span> \"failed to register character device: got major number %d<\/span>\\n<\/span>\"<\/span>,<\/span> rl_dev_major_num<\/span>);<\/span>\r\n    return<\/span> rl_dev_major_num<\/span>;<\/span>\r\n  }<\/span>\r\n\r\n  printk<\/span>(<\/span>KERN_INFO<\/span> \"Registered %s with major device number %d<\/span>\\n<\/span>\"<\/span>,<\/span> rl_device_name<\/span>,<\/span> rl_dev_major_num<\/span>);<\/span>\r\n  printk<\/span>(<\/span>KERN_INFO<\/span> \"Run \/bin\/mknod \/dev\/%s c %d 0<\/span>\\n<\/span>\"<\/span>,<\/span> rl_device_name<\/span>,<\/span> rl_dev_major_num<\/span>);<\/span>\r\n\r\n  return<\/span> rust_mod_init<\/span>();<\/span>\r\n}<\/span>\r\ninit<\/span>(<\/span>_mod_init<\/span>);<\/span>\r\n<\/code><\/pre>\n
rust_mod_init()\u306f\u3001Rust\u306e\u95a2\u6570\u547c\u3073\u51fa\u3057\u3067\u3059\u3002shim.c\u5185\u3067extern\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\/*\r\n * The entry points for the kernel module in Rust. We define\r\n * entry points in C for the module_init and module_exit macros.\r\n *\/<\/span>\r\nextern<\/span> int<\/span> rust_mod_init<\/span>(<\/span>void<\/span>);<\/span>\r\n<\/code><\/pre>\n
Rust\u5074\u306e\u5b9f\u88c5\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002
\nno_mangle\u3067\u30de\u30f3\u30b0\u30eb\u3055\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u4ee5\u5916\u306f\u3001\u666e\u901a\u306eRust\u306b\u898b\u3048\u307e\u3059\u306d\u3002<\/p>\n
\/\/ Entry points<\/span>\r\n#[no_mangle]<\/span>\r\npub<\/span> extern<\/span> \"C\"<\/span> fn<\/span> rust_mod_init<\/span>()<\/span> -><\/span> i32<\/span> {<\/span>\r\n    print!<\/span>(<\/span>\"Panic probability: {}\/{}<\/span>\\n<\/span>\"<\/span>,<\/span> CONFIG<\/span>.lock<\/span>()<\/span>.chance<\/span>,<\/span> MAX_RAND<\/span>);<\/span>\r\n    0<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u305f\u3060\u3001\u88cf\u3067\u306f\u8272\u3005\u3068\u52d5\u3044\u3066\u3044\u307e\u3059\u3002
\n\u9806\u756a\u306b\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002
\nprint!\u30de\u30af\u30ed\u3001\u30d2\u30fc\u30d7\u30a2\u30ed\u30b1\u30fc\u30bf\u3001CONFIG\u3001\u306e\u9806\u756a\u306b\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n
print!\u30de\u30af\u30ed<\/h4>\n
\u307e\u305a\u306f\u3001print!\u30de\u30af\u30ed\u3067\u3059\u3002
\n\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3063\u3066\u3044\u306a\u3044\u305f\u3081\u3001printk()\u3092\u30e9\u30c3\u30d7\u3059\u308b\u4ed5\u7d44\u307f\u3092\u81ea\u4f5c\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\/\/\/ Like the `print!` macro in the standard library, but calls printk<\/span>\r\n#[allow(unused_macros)]<\/span>\r\nmacro_rules!<\/span> print<\/span> {<\/span>\r\n    (<\/span>$<\/span>(<\/span>$arg:tt<\/span>)<\/span>*<\/span>)<\/span> =><\/span> (<\/span>$crate<\/span>::<\/span>io<\/span>::<\/span>print<\/span>(<\/span>format_args!<\/span>(<\/span>$<\/span>(<\/span>$arg<\/span>)<\/span>*<\/span>)));<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u306ecrate\u306eio\u30e2\u30b8\u30e5\u30fc\u30eb\u306eprint()\u3092\u8aad\u3093\u3067\u3044\u307e\u3059\u306d\u3002
\n\u3064\u307e\u308a\u3001\u540cio.rs\u5185\u306eprint()\u95a2\u6570\u3067\u3059\u3002<\/p>\n
pub<\/span> fn<\/span> print<\/span>(<\/span>args<\/span>:<\/span> fmt<\/span>::<\/span>Arguments<\/span>)<\/span> {<\/span>\r\n    use<\/span> core<\/span>::<\/span>fmt<\/span>::<\/span>Write<\/span>;<\/span>\r\n    let<\/span> mut<\/span> writer<\/span> =<\/span> PRINTK_WRITER<\/span>.lock<\/span>();<\/span>\r\n    writer<\/span>.write_fmt<\/span>(<\/span>args<\/span>)<\/span>.unwrap<\/span>();<\/span>\r\n    writer<\/span>.flush<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
PRINTK_WRITER\u306e\u30ed\u30c3\u30af\u3092\u53d6\u5f97\u3057\u3001writer\u304c\u5b9f\u88c5\u3057\u3066\u3044\u308bWrite trait\u306ewrite_fmt()\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u3002
\n\u3053\u306ePRINTK_WRITER\u306f\u3001Mutex\u4ed8\u304d\u306eKernelDebugWriter\u3067\u3059\u3002
\nlazy_static!\u30de\u30af\u30ed\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u6700\u521d\u306b\u4f7f\u308f\u308c\u308b\u3068\u304d\u306b\u521d\u671f\u5316\u3055\u308c\u307e\u3059\u3002<\/p>\n
lazy_static!<\/span> {<\/span>\r\n    \/\/\/ Used by the `print!` and `println!` macros.<\/span>\r\n    pub<\/span> static<\/span> ref<\/span> PRINTK_WRITER<\/span>:<\/span> Mutex<\/span><<\/span>KernelDebugWriter<\/span>><\/span> =<\/span> Mutex<\/span>::<\/span>new<\/span>(<\/span>KernelDebugWriter<\/span>::<\/span>default<\/span>());<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
KernelDebugWriter\u306f\u3001\u6700\u7d42\u7684\u306b\u3001C\u8a00\u8a9e\u306eprintk()\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002
\nprintk()\u95a2\u6570\u306b\u6e21\u3059\u6587\u5b57\u5217\u306f\u3001Vec\u3067\u30d0\u30c3\u30d5\u30a1\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002<\/p>\n
#[derive(Default)]<\/span>\r\npub<\/span> struct<\/span> KernelDebugWriter<\/span> {<\/span>\r\n    buffer<\/span>:<\/span> Vec<\/span><<\/span>u8<\/span>><\/span>,<\/span>\r\n}<\/span>\r\n\r\nextern<\/span> \"C\"<\/span> {<\/span>\r\n    \/\/ printk()\u306e\u30e9\u30c3\u30d1\u30fc<\/span>\r\n    fn<\/span> puts_c<\/span>(<\/span>len<\/span>:<\/span> u64<\/span>,<\/span> c<\/span>:<\/span> *<\/span>const<\/span> u8<\/span>);<\/span>\r\n}<\/span>\r\n\r\n\/\/ `buffer`\u3092\u62e1\u5f35\u3057\u3066\u3001`buffer`\u306b\u6587\u5b57\u5217\u3092\u8ffd\u52a0\u3059\u308b\u3002<\/span>\r\nimpl<\/span> fmt<\/span>::<\/span>Write<\/span> for<\/span> KernelDebugWriter<\/span> {<\/span>\r\n    fn<\/span> write_str<\/span>(<\/span>&<\/span>mut<\/span> self<\/span>,<\/span> s<\/span>:<\/span> &<\/span>str<\/span>)<\/span> -><\/span> fmt<\/span>::<\/span>Result<\/span> {<\/span>\r\n        \/\/ Add the bytes from `s` to the buffer<\/span>\r\n        self<\/span>.buffer<\/span>.extend<\/span>(<\/span>s<\/span>.bytes<\/span>());<\/span>\r\n        Ok<\/span>(())<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nimpl<\/span> KernelDebugWriter<\/span> {<\/span>\r\n    \/\/ \u5b9f\u969b\u306b\u6587\u5b57\u3092\u51fa\u529b\u3059\u308b\u3002\u51fa\u529b\u304c\u7d42\u308f\u308b\u3068\u3001`buffer`\u3092\u30af\u30ea\u30a2\u3059\u308b\u3002<\/span>\r\n    fn<\/span> flush<\/span>(<\/span>&<\/span>mut<\/span> self<\/span>)<\/span> {<\/span>\r\n        \/\/ Call c_puts with the string length and a pointer to its contents<\/span>\r\n        unsafe<\/span> {<\/span> puts_c<\/span>(<\/span>self<\/span>.buffer<\/span>.len<\/span>()<\/span> as<\/span> u64<\/span>,<\/span> self<\/span>.buffer<\/span>.as_ptr<\/span>()<\/span> as<\/span> *<\/span>const<\/span> u8<\/span>)<\/span> };<\/span>\r\n        self<\/span>.buffer<\/span>.clear<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Vec\u3092\u4f7f\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u30d2\u30fc\u30d7\u30a2\u30ed\u30b1\u30fc\u30bf\u304c\u5fc5\u8981\u3067\u3059\u3002\u3053\u308c\u306f\u5f8c\u3067\u8aac\u660e\u3057\u307e\u3059\u3002
\nwrite_str()\u3067buffer\u306b\u6587\u5b57\u5217\u306e\u30c7\u30fc\u30bf\u3092\u8ffd\u52a0\u3057\u3001flush()\u3067C\u8a00\u8a9e\u306eput_c()\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/p>\n
C\u8a00\u8a9e\u306e\u4e16\u754c\u306b\u623b\u308a\u307e\u3059\u3002put_c()\u306fprintk()\u306e\u30e9\u30c3\u30d1\u30fc\u3067\u3059\u306d\u3002<\/p>\n
\/*\r\n * A utility function to print a string.\r\n * NOTE: `str` is not necessarily NULL-terminated.\r\n *\/<\/span>\r\nvoid<\/span> puts_c<\/span>(<\/span>u64<\/span> length<\/span>,<\/span> char<\/span>*<\/span> str<\/span>)<\/span> {<\/span>\r\n  printk<\/span>(<\/span>KERN_DEBUG<\/span> \"%.*s\"<\/span>,<\/span> (<\/span>int<\/span>)<\/span>length<\/span>,<\/span> str<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u3067\u3001Rust\u304b\u3089kernel\u30ed\u30b0\u3092\u51fa\u529b\u3067\u304d\u308b\u4ed5\u7d44\u307f\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n
\u30d2\u30fc\u30d7\u30a2\u30ed\u30b1\u30fc\u30bf<\/h4>\n
kmalloc()\u3092\u30e9\u30c3\u30d7\u3057\u3066\u3001Vec\u306e\u5229\u7528\u3092\u89e3\u7981\u3057\u307e\u3059\u3002<\/p>\n
Rust\u306e\u30d9\u30a2\u30e1\u30bf\u30eb\u30d2\u30fc\u30d7\u30a2\u30ed\u30b1\u30fc\u30bf\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3067\u66f8\u304d\u307e\u3057\u305f\u3002\u8a73\u7d30\u306b\u8208\u5473\u304c\u3042\u308c\u3070\u3054\u89a7\u4e0b\u3055\u3044\u3002
\nRedox Slab Allocator\u3067\u5b66\u3076Rust\u30d9\u30a2\u30e1\u30bf\u30eb\u74b0\u5883\u306e\u30d2\u30fc\u30d7\u30a2\u30ed\u30b1\u30fc\u30bf<\/p>\n
print!\u30de\u30af\u30ed\u3067\u306f\u3001\u6587\u5b57\u5217\u3092Vec\u306ebuffer\u3067\u30d0\u30c3\u30d5\u30a1\u30ea\u30f3\u30b0\u3057\u3066\u3001printk()\u306b\u51fa\u529b\u3092\u59d4\u8b72\u3057\u3066\u3044\u307e\u3057\u305f\u3002
\nVec\u3092\u4f7f\u3046\u305f\u3081\u306b\u306f\u3001\u30d2\u30fc\u30d7\u9818\u57df\u3092\u78ba\u4fdd\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30d2\u30fc\u30d7\u9818\u57df\u3092\u4f7f\u3046\u305f\u3081\u306b\u306f\u3001GlobalAlloc trait\u3092\u5b9f\u88c5\u3057\u305f\u30a2\u30ed\u30b1\u30fc\u30bf\u3092#[global_allocator]\u30a2\u30c8\u30ea\u30d3\u30e5\u30fc\u30c8\u3092\u4ed8\u3051\u3066\u5b9a\u7fa9\u3057\u307e\u3059\u3002
\n\u30a2\u30ed\u30b1\u30fc\u30bf\u306f\u6b21\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\/\/ Set up the global allocator<\/span>\r\n#[global_allocator]<\/span>\r\nstatic<\/span> ALLOCATOR<\/span>:<\/span> mem<\/span>::<\/span>KernelAllocator<\/span> =<\/span> mem<\/span>::<\/span>KernelAllocator<\/span>::<\/span>new<\/span>();<\/span>\r\n<\/code><\/pre>\n
KernelAllocator\u306e\u5185\u90e8\u3092\u8ffd\u3063\u3066\u3044\u304d\u307e\u3059\u3002\u91cd\u8981\u306a\u306e\u306fGlobalAlloc trait\u306e\u5b9f\u88c5\u3067\u3059\u3002<\/p>\n
#[derive(Default)]<\/span>\r\npub<\/span> struct<\/span> KernelAllocator<\/span>;<\/span>\r\n\r\nimpl<\/span> KernelAllocator<\/span> {<\/span>\r\n    pub<\/span> const<\/span> fn<\/span> new<\/span>()<\/span> -><\/span> Self<\/span> {<\/span>\r\n        Self<\/span> {}<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n\/\/ Use shim functions to avoid hardcoding the GFP_KERNEL constant<\/span>\r\n#[allow(dead_code)]<\/span>\r\nextern<\/span> \"C\"<\/span> {<\/span>\r\n    fn<\/span> kmalloc_c<\/span>(<\/span>size<\/span>:<\/span> usize<\/span>)<\/span> -><\/span> *<\/span>mut<\/span> u8<\/span>;<\/span>\r\n    fn<\/span> kfree_c<\/span>(<\/span>ptr<\/span>:<\/span> *<\/span>mut<\/span> u8<\/span>);<\/span>\r\n    fn<\/span> krealloc_c<\/span>(<\/span>ptr<\/span>:<\/span> *<\/span>mut<\/span> u8<\/span>,<\/span> size<\/span>:<\/span> usize<\/span>)<\/span> -><\/span> *<\/span>mut<\/span> u8<\/span>;<\/span>\r\n}<\/span>\r\n\r\nunsafe<\/span> impl<\/span> GlobalAlloc<\/span> for<\/span> KernelAllocator<\/span> {<\/span>\r\n    unsafe<\/span> fn<\/span> alloc<\/span>(<\/span>&<\/span>self<\/span>,<\/span> layout<\/span>:<\/span> Layout<\/span>)<\/span> -><\/span> *<\/span>mut<\/span> u8<\/span> {<\/span>\r\n        \/\/ A side effect of the buddy allocator is that allocations are aligned to<\/span>\r\n        \/\/ the power-of-two that is larger than the allocation size. So if the<\/span>\r\n        \/\/ request needs to be aligned to something larger than the allocation size,<\/span>\r\n        \/\/ we can just pass max(size, align) to kmalloc to get something reasonable<\/span>\r\n        \/\/ at the cost of a few extra wasted bytes.<\/span>\r\n        use<\/span> core<\/span>::<\/span>cmp<\/span>::<\/span>max<\/span>;<\/span>\r\n        let<\/span> p<\/span> =<\/span> kmalloc_c<\/span>(<\/span>max<\/span>(<\/span>layout<\/span>.size<\/span>(),<\/span> layout<\/span>.align<\/span>()));<\/span>\r\n        if<\/span> p<\/span>.is_null<\/span>()<\/span> {<\/span>\r\n            0<\/span> as<\/span> *<\/span>mut<\/span> u8<\/span>            \r\n        }<\/span> else<\/span> {<\/span>\r\n            p<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    unsafe<\/span> fn<\/span> dealloc<\/span>(<\/span>&<\/span>self<\/span>,<\/span> ptr<\/span>:<\/span> *<\/span>mut<\/span> u8<\/span>,<\/span> _<\/span>layout<\/span>:<\/span> Layout<\/span>)<\/span> {<\/span>\r\n        kfree_c<\/span>(<\/span>ptr<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
alloc()\u3067\u306f\u3001kmalloc_c()\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306fC\u8a00\u8a9e\u306ekmalloc\u306e\u30e9\u30c3\u30d1\u30fc\u3067\u3059\u3002<\/p>\n
\/*\r\n * Re-exported memory management functions\r\n *\/<\/span>\r\nvoid<\/span>*<\/span> kmalloc_c<\/span>(<\/span>size_t<\/span> size<\/span>)<\/span> {<\/span>\r\n  return<\/span> kmalloc<\/span>(<\/span>size<\/span>,<\/span> GFP_KERNEL<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u8584\u3044\u30e9\u30c3\u30d1\u30fc1\u679a\u3092\u4f5c\u308b\u3060\u3051\u3067\u3001Vec\u3084Box\u306a\u3069\u306e\u4fbf\u5229\u6a5f\u80fd\u304c\u89e3\u7981\u3068\u306a\u308b\u308f\u3051\u3067\u3059\u3002\u3053\u308c\u306f\u6717\u5831\u3067\u3059\u306d\uff01<\/p>\n
CONFIG<\/h4>\n
Rust\u5074\u306e\u521d\u671f\u5316\u51e6\u7406\u3092\u518d\u63b2\u8f09\u3057\u307e\u3059\u3002<\/p>\n
\/\/ Entry points<\/span>\r\n#[no_mangle]<\/span>\r\npub<\/span> extern<\/span> \"C\"<\/span> fn<\/span> rust_mod_init<\/span>()<\/span> -><\/span> i32<\/span> {<\/span>\r\n    print!<\/span>(<\/span>\"Panic probability: {}\/{}<\/span>\\n<\/span>\"<\/span>,<\/span> CONFIG<\/span>.lock<\/span>()<\/span>.chance<\/span>,<\/span> MAX_RAND<\/span>);<\/span>\r\n    0<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
CONFIG.lock().chance\u306fkernel panic\u304c\u767a\u751f\u3059\u308b\u78ba\u7387\u3067\u3059\u3002\u3069\u306e\u3088\u3046\u306b\u521d\u671f\u5316\u3055\u308c\u3066\u3044\u308b\u304b\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
lazy_static!<\/span> {<\/span>\r\n    \/\/ CONFIG\u306fRouletteConfig\u3092Mutex\u3067\u5305\u3093\u3067\u3044\u307e\u3059<\/span>\r\n    pub<\/span> static<\/span> ref<\/span> CONFIG<\/span>:<\/span> Mutex<\/span><<\/span>RouletteConfig<\/span>><\/span> =<\/span> Mutex<\/span>::<\/span>new<\/span>(<\/span>RouletteConfig<\/span>::<\/span>new<\/span>());<\/span>\r\n}<\/span>\r\n\r\n#[derive(Default)]<\/span>\r\npub<\/span> struct<\/span> RouletteConfig<\/span> {<\/span>\r\n    pub<\/span> chance<\/span>:<\/span> u8<\/span>,<\/span>\r\n}<\/span>\r\n\r\nimpl<\/span> RouletteConfig<\/span> {<\/span>\r\n    pub<\/span> fn<\/span> new<\/span>()<\/span> -><\/span> Self<\/span> {<\/span>\r\n        \/\/ MIN_RAND(0)\u304b\u3089MAX_RAND(100)\u306e\u7bc4\u56f2\u3067\u4e71\u6570\u3092\u751f\u6210\u3057\u307e\u3059<\/span>\r\n        let<\/span> chance<\/span> =<\/span> RNG<\/span>.lock<\/span>()<\/span>.gen_range<\/span>(<\/span>MIN_RAND<\/span>,<\/span> MAX_RAND<\/span>);<\/span>\r\n        RouletteConfig<\/span> {<\/span> chance<\/span>:<\/span> chance<\/span> }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6b63\u78ba\u306b\u306f\u30010\uff5e99\u306e\u7bc4\u56f2\u3067\u4e71\u6570\u3092\u751f\u6210\u3057\u307e\u3059\u3002API\u306e\u89e3\u8aac\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
Generate a random value in the range [low, high), i.e. inclusive of low and exclusive of high.<\/p><\/blockquote>\n
RNG\u306f\u6b21\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002JitterRng\u3068\u3044\u3046\u4e71\u6570\u751f\u6210\u5668\u3092Mutex\u3067\u5305\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n
lazy_static!<\/span> {<\/span>\r\n    static<\/span> ref<\/span> RNG<\/span>:<\/span> Mutex<\/span><<\/span>rand<\/span>::<\/span>JitterRng<\/span>><\/span> =<\/span> Mutex<\/span>::<\/span>new<\/span>(<\/span>rand<\/span>::<\/span>JitterRng<\/span>::<\/span>new_with_timer<\/span>(||<\/span> unsafe<\/span> {<\/span> nanosecond_timer_c<\/span>()<\/span> }));<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
JitterRng\u306fCPU\u5b9f\u884c\u6642\u9593\u306e\u30b8\u30c3\u30bf\u3068\u30e1\u30e2\u30ea\u30a2\u30af\u30bb\u30b9\u306e\u30b8\u30c3\u30bf\u3068\u3092\u4f7f\u3063\u305f\u3001\u4e71\u6570\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u3001\u3068\u306e\u3053\u3068\u3067\u3059\u3002
\nnew_with_timer()\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001no_std\u74b0\u5883\u3067JitterRng\u3092\u4f7f\u3046\u5834\u5408\u306eAPI\u3067\u3059\u3002<\/p>\n
pub<\/span> fn<\/span> new_with_timer<\/span>(<\/span>timer<\/span>:<\/span> fn<\/span>()<\/span> -><\/span> u64<\/span>)<\/span> -><\/span> JitterRng<\/span>\r\n<\/code><\/pre>\n
Create a new JitterRng. A custom timer can be supplied, making it possible to use JitterRng in no_std environments.<\/p><\/blockquote>\n
new_with_timer()\u3067\u6e21\u3057\u3066\u3044\u308b\u30af\u30ed\u30fc\u30b8\u30e3\u3067\u306f\u3001C\u8a00\u8a9e\u306enanosecond_timer_c()\u3092\u547c\u3093\u3067\u3044\u307e\u3059\u3002
\n\u3053\u306e\u4e2d\u3067\u306fjiffies\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n
\/*\r\n * This isn't really a nanosecond timer but its close enough.\r\n *\/<\/span>\r\nu64<\/span> nanosecond_timer_c<\/span>(<\/span>void<\/span>)<\/span> {<\/span>\r\n  return<\/span> get_jiffies_64<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5c11\u3057\u6574\u7406\u3059\u308b\u3068\u3001RNG\u306fMutex\u3067\u5305\u307e\u308c\u305f\u4e71\u6570\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u3067\u3059\u3002
\nRNG.gen_range(MIN_RAND, MAX_RAND)\u3092\u547c\u3073\u51fa\u3059\u3068\u3001\u30af\u30ed\u30fc\u30b8\u30e3\u3067jiffies\u3092\u53d6\u5f97\u3057\u30010\u304b\u308999\u306e\u7bc4\u56f2\u3067\u4e71\u6570\u3092\u751f\u6210\u3057\u307e\u3059\u3002
\nCONFIG\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u6642\u306b\u3001RNG.get_range()\u3092\u547c\u3073\u51fa\u3057\u3001panic\u78ba\u7387\u3067\u3042\u308bchance\u3092\u521d\u671f\u5316\u3057\u307e\u3059\u3002<\/p>\n
\u7d42\u4e86\u51e6\u7406\u306f\u7279\u306b\u96e3\u3057\u3044\u3053\u3068\u3092\u3057\u3066\u3044\u306a\u3044\u306e\u3067\u3001\u7701\u7565\u3057\u307e\u3059\u3002<\/p>\n
\u30ed\u30b7\u30a2\u30f3\u30eb\u30fc\u30ec\u30c3\u30c8\u5b9f\u884c<\/h3>\n
\u305d\u308c\u3067\u306f\u3001\u809d\u5fc3\u306e\u30ed\u30b7\u30a2\u30f3\u30eb\u30fc\u30ec\u30c3\u30c8\u5b9f\u884c\u90e8\u5206\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002
\n\u8a18\u4e8b\u306e\u6700\u521d\u306e\u65b9\u3067\u3084\u3063\u305f\u901a\u308a\u3001\/dev\/kernel-roulette\u3092cat\u3057\u305f\u3068\u304d(\u3088\u308a\u6b63\u78ba\u306b\u306fopen()\u547c\u3073\u51fa\u3057\u6642)\u306b\u4e71\u6570\u3092\u751f\u6210\u3057\u3001chance\u3088\u308a\u5c0f\u3055\u306a\u5024\u304c\u51fa\u308b\u3068panic\u3057\u307e\u3059\u3002<\/p>\n
$ cat \/dev\/kernel-roulette\r\nSurvived... sampled value is 86, which is >= 49\r\n$ cat \/dev\/kernel-roulette\r\nSegmentation fault\r\n<\/code><\/pre>\n
\u6b8b\u5ff5\u306a\u3053\u3068\u306b\u3001\u30c7\u30d0\u30a4\u30b9\u30d5\u30a1\u30a4\u30eb\u306e\u64cd\u4f5c\u306f\u307b\u3068\u3093\u3069C\u8a00\u8a9e\u3067\u51e6\u7406\u3057\u3066\u3044\u307e\u3059\u3002
\n\u307e\u305a\u3001\u30ad\u30e3\u30e9\u30af\u30bf\u30c7\u30d0\u30a4\u30b9\u3067\u3059\u304c\u3001_mod_init()\u3067\u767b\u9332\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n
static<\/span> int<\/span> _mod_init<\/span>(<\/span>void<\/span>)<\/span> {<\/span>\r\n\r\n  \/\/ Register a character device<\/span>\r\n  rl_dev_major_num<\/span> =<\/span> register_chrdev<\/span>(<\/span>0<\/span> \/* allocate a major number *\/<\/span>,<\/span> rl_device_name<\/span>,<\/span> &<\/span>rl_driver_fops<\/span>);<\/span>\r\n...<\/span>\r\n<\/code><\/pre>\n
\u30ad\u30e3\u30e9\u30af\u30bf\u30c7\u30d0\u30a4\u30b9\u30c9\u30e9\u30a4\u30d0\u306b\u306f\u3001open(), release(), read()\u304c\u5b9f\u88c5\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
static<\/span> int<\/span> rl_device_open<\/span>(<\/span>struct<\/span> inode<\/span>*<\/span> inode<\/span>,<\/span> struct<\/span> file<\/span>*<\/span> filp<\/span>);<\/span>\r\nstatic<\/span> int<\/span> rl_device_release<\/span>(<\/span>struct<\/span> inode<\/span>*<\/span> inode<\/span>,<\/span> struct<\/span> file<\/span>*<\/span> filp<\/span>);<\/span>\r\nstatic<\/span> ssize_t<\/span> rl_device_read<\/span>(<\/span>struct<\/span> file<\/span>*<\/span> filp<\/span>,<\/span>    \/* see include\/linux\/fs.h   *\/<\/span>\r\n                              char<\/span> __user<\/span>*<\/span> buffer<\/span>,<\/span>  \/* buffer to fill with data *\/<\/span>\r\n                              size_t<\/span> length<\/span>,<\/span>    \/* length of the buffer  *\/<\/span>\r\n                              loff_t<\/span>*<\/span> offset<\/span> \/* the file offset *\/<\/span>);<\/span>\r\nstatic<\/span> struct<\/span> file_operations<\/span> rl_driver_fops<\/span> =<\/span> {<\/span>\r\n  .<\/span>read<\/span> =<\/span> rl_device_read<\/span>,<\/span>\r\n  .<\/span>open<\/span> =<\/span> rl_device_open<\/span>,<\/span>\r\n  .<\/span>release<\/span> =<\/span> rl_device_release<\/span>,<\/span>\r\n};<\/span>\r\nstatic<\/span> int<\/span> rl_dev_major_num<\/span> =<\/span> 0<\/span>;<\/span>\r\nstatic<\/span> const<\/span> char<\/span> rl_device_name<\/span>[]<\/span> =<\/span> \"kernel-roulette\"<\/span>;<\/span>\r\n<\/code><\/pre>\n
release()\u3068read()\u304b\u3089\u306fRust\u3092\u547c\u3093\u3067\u3044\u306a\u3044\u305f\u3081\u3001open()\u3060\u3051\u89e3\u8aac\u3057\u307e\u3059\u3002
\nRust\u3092\u547c\u3093\u3067\u3044\u308b\u306e\u306f\u3001sample()\u306e\u90e8\u5206\u3067\u3059\u3002<\/p>\n
static<\/span> int<\/span> rl_device_open<\/span>(<\/span>struct<\/span> inode<\/span>*<\/span> inode<\/span>,<\/span> struct<\/span> file<\/span>*<\/span> filp<\/span>)<\/span> {<\/span>\r\n  u8<\/span> sampled<\/span>;<\/span>\r\n  struct<\/span> rl_state<\/span>*<\/span> state<\/span>;<\/span>\r\n...<\/span>\r\n  \/\/ Get a sample from Rust<\/span>\r\n  sampled<\/span> =<\/span> sample<\/span>();<\/span> \/\/ may panic!<\/span>\r\n...<\/span>\r\n  \/\/ read()\u3067\u8aad\u307f\u3060\u3059\u30c7\u30fc\u30bf\u3092\u3053\u3053\u3067\u4f5c\u6210\u3057\u307e\u3059<\/span>\r\n  \/\/ Format data and store in string<\/span>\r\n  snprintf<\/span>(<\/span>state<\/span>-><\/span>data<\/span>,<\/span> MAX_BUFFER_SIZE<\/span>,<\/span> \"Survived... sampled value is %d, which is >= %d<\/span>\\n<\/span>\"<\/span>,<\/span> sampled<\/span>,<\/span> get_chance<\/span>());<\/span>\r\n...<\/span>\r\n  \/\/ Set private_data to the state we allocated<\/span>\r\n  filp<\/span>-><\/span>private_data<\/span> =<\/span> state<\/span>;<\/span>\r\n  return<\/span> SUCCESS<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Rust\u306esample()\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
#[no_mangle]<\/span>\r\npub<\/span> extern<\/span> \"C\"<\/span> fn<\/span> sample<\/span>()<\/span> -><\/span> u8<\/span> {<\/span>\r\n    let<\/span> sampled<\/span> =<\/span> RNG<\/span>.lock<\/span>()<\/span>.gen_range<\/span>(<\/span>MIN_RAND<\/span>,<\/span> MAX_RAND<\/span>);<\/span>\r\n    if<\/span> sampled<\/span> <<\/span> CONFIG<\/span>.lock<\/span>()<\/span>.chance<\/span> {<\/span>\r\n        panic!<\/span>(<\/span>\"Boom!\"<\/span>);<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n        sampled<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u65b0\u305f\u306b\u751f\u6210\u3057\u305f\u4e71\u6570\u304c\u3001chance\u3088\u308a\u5c0f\u3055\u3051\u308c\u3070\u3001”Boom”\u3092\u51fa\u529b\u3057\u3066\u3001panic\u3057\u307e\u3059\u3002
\npanic_handler\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
#[panic_handler]<\/span>\r\n#[no_mangle]<\/span>\r\npub<\/span> fn<\/span> rust_begin_panic<\/span>(<\/span>info<\/span>:<\/span> &<\/span>PanicInfo<\/span>)<\/span> -><\/span> !<\/span> {<\/span>\r\n    \/\/ Print the file and line number<\/span>\r\n    if<\/span> let<\/span> Some<\/span>(<\/span>location<\/span>)<\/span> =<\/span> info<\/span>.location<\/span>()<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"Rust panic @ {}:{}\"<\/span>,<\/span>\r\n            location<\/span>.file<\/span>(),<\/span> location<\/span>.line<\/span>());<\/span>\r\n    }<\/span>\r\n\r\n    \/\/ Print the message and a newline<\/span>\r\n    if<\/span> let<\/span> Some<\/span>(<\/span>message<\/span>)<\/span> =<\/span> info<\/span>.message<\/span>()<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> message<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    unsafe<\/span> {<\/span>\r\n        \/\/ In a real kernel module, we should use abort() instead of panic()<\/span>\r\n        abort<\/span>()<\/span> \/\/ replace with panic_c() if you want<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6700\u7d42\u7684\u306bC\u8a00\u8a9e\u306eabort()\u3092\u547c\u3093\u3067\u3044\u307e\u3059\u3002abort()\u306fBUG()\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/p>\n
\/*\r\n * Define the abort() function. We use the BUG() macro, which generates a ud2 instruction.\r\n *\/<\/span>\r\nvoid<\/span> abort<\/span>(<\/span>void<\/span>)<\/span> {<\/span>\r\n  BUG<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3061\u306a\u307f\u306b\u3001abort()\u306e\u4ee3\u308f\u308a\u306b\u3001panic_c()\u3092\u547c\u3073\u51fa\u3059\u3068\u2026<\/p>\n
void<\/span> panic_c<\/span>(<\/span>void<\/span>)<\/span> {<\/span>\r\n  panic<\/span>(<\/span>\"Panic!\"<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u672c\u5f53\u306b\u30d5\u30ea\u30fc\u30ba\u3057\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0a\u3067\u4e3b\u8981\u306a\u51e6\u7406\u306e\u89e3\u6790\u306f\u5b8c\u4e86\u3067\u3059\u3002
\n\u3044\u304b\u304c\u3067\u3057\u305f\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n
\u307e\u3068\u3081<\/h1>\n
    \n
  • \n
      Linux kernel module\u304b\u3089Rust\u3092\u547c\u3079\u307e\u3059\u3002Rust\u3092\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u30d3\u30eb\u30c9\u3057\u3066\u304a\u304d\u3001C\u8a00\u8a9e\u306ekernel module object\u3068\u30ea\u30f3\u30af\u3059\u308b\u3060\u3051\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \n
      • \n
          kmalloc()\u306e\u30e9\u30c3\u30d1\u30fc\u3092\u7528\u610f\u3059\u308b\u3053\u3068\u3067\u3001Vec\u306a\u3069\u3001\u30d2\u30fc\u30d7\u9818\u57df\u3092\u4f7f\u3046\u6a5f\u80fd\u304c\u4f7f\u3048\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n
           <\/p>\n
            \n
          • \n
              printk()\u306e\u30e9\u30c3\u30d1\u30fc\u3092\u7528\u610f\u3059\u308b\u3053\u3068\u3067\u3001print!\u30de\u30af\u30ed\u3092\u4f5c\u3063\u3066\u3001\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u3088\u3046\u306b\u4f7f\u3048\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n
               <\/p>\n
                \u6b8b\u5ff5\u306a\u304c\u3089\u30c7\u30d0\u30a4\u30b9\u30d5\u30a1\u30a4\u30eb\u306e\u64cd\u4f5c\u306f\u307b\u3068\u3093\u3069C\u8a00\u8a9e\u3067\u3057\u305f\u3002<\/ul>\n
                \u53c2\u8003<\/h1>\n
                kernel-roulette<\/p>\n","protected":false},"excerpt":{"rendered":"
                kernel-roulette Rust\u3067Linux kernel module\u304c\u66f8\u3051\u308b\u2026\u3002\u5642\u306e\u771f\u76f8\u3092\u7a81\u304d\u6b62\u3081 […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45444","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/45444-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"kernel-roulette Rust\u3067Linux kernel module\u304c\u66f8\u3051\u308b\u2026\u3002\u5642\u306e\u771f\u76f8\u3092\u7a81\u304d\u6b62\u3081 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45444-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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