Rust\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u304b\u3089QEMU\u4e0a\u306e\u30e9\u30ba\u30d1\u30a42\u3067\u30d9\u30a2\u30e1\u30bf\u30eb(OS\u306a\u3057)\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u52d5\u4f5c\u3059\u308b\u3068\u3053\u308d\u307e\u3067\u3092\u89e3\u8aac\u3002<\/p>\n
\u30ea\u30dd\u30b8\u30c8\u30ea\u306f\u3053\u3061\u3089
\nhttps:\/\/github.com\/maueki\/baremetal-raspi2-qemu<\/p>\n
\u7b46\u8005\u306e\u74b0\u5883(Debian GNU\/Linux)\u3060\u3068\u4ee5\u4e0b\u3067\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u53ef\u80fd\u3002<\/p>\n
$ <\/span>sudo <\/span>apt install <\/span>qemu-system-arm\r\n<\/code><\/pre>\nRust\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/h1>\n
Rust\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u30fb\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306frustup\u3067\u304a\u3053\u306a\u3046\u3002<\/p>\n
$ <\/span>curl https:\/\/sh.rustup.rs -sSf<\/span> | sh\r\n<\/code><\/pre>\n\u3059\u3067\u306brust\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066\u3042\u308b\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3067\u6700\u65b0\u7248\u306b\u3057\u3066\u304a\u304f\u3002<\/p>\n
$ <\/span>rustup update\r\n<\/code><\/pre>\n\u30af\u30ed\u30b9\u30d3\u30eb\u30c9\u30c4\u30fc\u30eb\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/h1>\n
Rust\u3092\u666e\u901a\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305f\u3060\u3051\u3067\u306f\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305f\u30de\u30b7\u30f3\u5411\u3051\u306e\u30d0\u30a4\u30ca\u30ea\u3057\u304b\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u3002
\n\u672c\u6765\u3060\u3068\u30e9\u30ba\u30d1\u30a4\uff12\u306eCPU\u3067\u3042\u308bARM(cortex-A7)\u7528\u306etoolchain\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066\u2026\u2026\u3068\u306a\u308b\u3068\u3053\u308d\u3060\u304c\u3001\u305d\u3046\u3044\u3063\u305f\u9762\u5012\u306a\u4f5c\u696d\u3092\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u306b\u5f93\u3063\u3066\u81ea\u52d5\u3067\u884c\u3063\u3066\u304f\u308c\u308b\u30c4\u30fc\u30ebcargo-xbuild(xargo\u306efork)\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u3002<\/p>\n
$ <\/span>cargo install <\/span>cargo-xbuild\r\n<\/code><\/pre>\n\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u4f5c\u6210<\/h1>\n
Rust\u3068\u4e00\u7dd2\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u308bcargo\u3092\u4f7f\u3063\u3066\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u96db\u5f62\u3092\u4f5c\u308b\u3002<\/p>\n
$ <\/span>cargo new baremetal-raspi2 --bin<\/span>\r\n$ <\/span>cd <\/span>baremetal-raspi2\r\n<\/code><\/pre>\n\u3053\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u4f7f\u7528\u3055\u308c\u308bRust\u3092nightly\u306b\u5909\u66f4\u3057\u3066\u304a\u304f\u3002<\/p>\n
$ <\/span>rustup override add nightly\r\n<\/code><\/pre>\nRust\u306b\u306fstable\u3001unstable\u3001\u3068\u5b9f\u9a13\u7684\u4f4d\u7f6e\u3065\u3051\u306enightly\u306e\uff13\u3064\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u5b58\u5728\u3059\u308b\u304c\u3001\u30d9\u30a2\u30e1\u30bf\u30eb\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3059\u308b\u969b\u306b\u306fnightly\u306b\u3057\u304b\u5b9f\u88c5\u3055\u308c\u3066\u3044\u306a\u3044\u6a5f\u80fd\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u305f\u3081\u3060\u3002<\/p>\n
boot.S<\/h1>\n
\u3044\u3088\u3044\u3088Rust\u3067\u30b3\u30fc\u30c9\u3092\u66f8\u304d\u59cb\u3081\u308b\u2026\u2026\u3068\u8a00\u3044\u305f\u3044\u3068\u3053\u308d\u3060\u304c\u4e00\u756a\u59cb\u3081\u306b\u52d5\u304f\u30b3\u30fc\u30c9\u306f\u30a2\u30bb\u30f3\u30d6\u30e9\u304c\u90fd\u5408\u304c\u826f\u3044\u305f\u3081\u3001\u30a2\u30bb\u30f3\u30d6\u30e9\u3067\u66f8\u304f\u3002<\/p>\n
.section \".text.boot\"\r\n\r\n.globl _start\r\n_start:\r\nhalt:\r\n wfe\r\n b halt\r\n<\/code><\/pre>\n\u7121\u9650\u30eb\u30fc\u30d7\u3059\u308b\u3060\u3051\u306e\u30b3\u30fc\u30c9\u3060\u3002.section “.text.boot”\u306f\u5f8c\u3067\u3053\u306e\u30b3\u30fc\u30c9\u3092\u30e1\u30e2\u30ea\u914d\u7f6e\u3059\u308b\u3068\u304d\u306e\u76ee\u5b89\u3068\u306a\u308b\u3002<\/p>\n
main.rs<\/h1>\n
\u3055\u3066\u672c\u6765\u3067\u3042\u308c\u3070boot.S\u3092\u30d3\u30eb\u30c9\u3059\u308b\u305f\u3081\u306bbuild.rs\u3092\u66f8\u304f\u3068\u3053\u308d\u3060\u304c\u3001\u3061\u3087\u3063\u3068\u9762\u5012\u306a\u306e\u3067\u5f8c\u56de\u3057\u306b\u3057\u3066\u3001\u3053\u3053\u3067\u306fRust\u30bd\u30fc\u30b9\u306b\u30a2\u30bb\u30f3\u30d6\u30e9\u30d5\u30a1\u30a4\u30eb\u3092\u53d6\u308a\u8fbc\u3093\u3067\u3057\u307e\u3048\u308bglobal_asm!\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3057\u305fmain.rs\u3092\u7528\u610f\u3059\u308b\u3002<\/p>\n
#![feature(global_asm,<\/span> asm)]<\/span>\r\n#![no_std]<\/span>\r\n#![no_main]<\/span>\r\n\r\nuse<\/span> core<\/span>::<\/span>panic<\/span>::<\/span>PanicInfo<\/span>;<\/span>\r\n\r\nglobal_asm!<\/span>(<\/span>include_str!<\/span>(<\/span>\"boot.S\"<\/span>));<\/span>\r\n\r\n#[panic_handler]<\/span>\r\nfn<\/span> panic<\/span>(<\/span>_<\/span>info<\/span>:<\/span> &<\/span>PanicInfo<\/span>)<\/span> -><\/span> !<\/span> {<\/span>\r\n loop<\/span> {<\/span>\r\n unsafe<\/span> {<\/span>asm!<\/span>(<\/span>\"\"<\/span> ::::<\/span> \"volatile\"<\/span>)}<\/span>\r\n }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n\u30d9\u30a2\u30e1\u30bf\u30eb\u306a\u306e\u3067\u666e\u6bb5\u4f7f\u7528\u3057\u3066\u3044\u308blibstd(std\u30e2\u30b8\u30e5\u30fc\u30eb)\u306f\u4f7f\u7528\u3067\u304d\u306a\u3044\u3002\u305d\u306e\u305f\u3081\u306b#[no_std]\u3092\u66f8\u304f\u3002
\n\u307e\u305f\u3001\u901a\u5e38\u306e\u3088\u3046\u306bmain()\u3092\u66f8\u3051\u3070\u81ea\u52d5\u7684\u306b\u305d\u3053\u304c\u30a8\u30f3\u30c8\u30ea\u30dd\u30a4\u30f3\u30c8\u306b\u306a\u308b\u3068\u3044\u3046\u3053\u3068\u3082\u306a\u3044\u305f\u3081#[no_main]\u3092\u66f8\u3044\u3066main()\u306f\u66f8\u304b\u306a\u3044\u3002<\/p>\n
\u305d\u3057\u3066\u3001global_asm!(include_str!(“boot.S”));\u3067\u5148\u7a0b\u306eboot.S\u3092\u53d6\u308a\u8fbc\u3080\u3002<\/p>\n
panic()\u306f#[no_std]\u74b0\u5883\u3067\u30d1\u30cb\u30c3\u30af\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306b\u5b9f\u884c\u3055\u308c\u308b\u51e6\u7406\u3068\u3057\u3066\u5fc5\u8981\u3068\u306a\u308b\u3002\u3053\u3053\u3067\u306f\u5358\u7d14\u306b\u51e6\u7406\u3092\u7121\u9650\u30eb\u30fc\u30d7\u306b\u843d\u3068\u3059\u3060\u3051\u306a\u306e\u3060\u304c\u3001\u3069\u3046\u3084\u3089Rust\u306f\u526f\u4f5c\u7528\u306a\u3057\u306e\u7121\u9650\u30eb\u30fc\u30d7\u306f\u307e\u305a\u3044\u3089\u3057\u3044\u306e\u3067asm!(“” :::: “volatile”)\u3067\u305d\u308c\u3092\u56de\u907f\u3057\u3066\u3044\u308b\u3002<\/p>\n
Cargo.toml<\/h1>\n
Cargo.toml\u306b\u4ee5\u4e0b\u3092\u8ffd\u52a0\u3002<\/p>\n
[<\/span>profile<\/span>.dev<\/span>]<\/span>\r\npanic<\/span> =<\/span> \"abort\"<\/span>\r\n\r\n[<\/span>profile<\/span>.release<\/span>]<\/span>\r\npanic<\/span> =<\/span> \"abort\"<\/span>\r\n<\/code><\/pre>\n\u3053\u308c\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0b\u53c2\u7167\u3002
\nhttps:\/\/os.phil-opp.com\/freestanding-rust-binary\/#disabling-unwinding<\/p>\n
\u30d3\u30eb\u30c9\u30bf\u30fc\u30b2\u30c3\u30c8\u30d5\u30a1\u30a4\u30eb\u4f5c\u6210<\/h1>\n
xbuild\u306b\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u307e\u305b\u3066\u3001\u30af\u30ed\u30b9\u30d3\u30eb\u30c9\u74b0\u5883\u3092\u81ea\u52d5\u3067\u7528\u610f\u3057\u3066\u3082\u3089\u3046\u3002<\/p>\n
{<\/span>\r\n \"llvm-target\"<\/span>:<\/span> \"armv7-none-eabihf\"<\/span>,<\/span>\r\n \"target-endian\"<\/span>:<\/span> \"little\"<\/span>,<\/span>\r\n \"target-pointer-width\"<\/span>:<\/span> \"32\"<\/span>,<\/span>\r\n \"target-c-int-width\"<\/span>:<\/span> \"32\"<\/span>,<\/span>\r\n \"os\"<\/span>:<\/span> \"none\"<\/span>,<\/span>\r\n \"env\"<\/span>:<\/span> \"eabi\"<\/span>,<\/span>\r\n \"vendor\"<\/span>:<\/span> \"unknown\"<\/span>,<\/span>\r\n \"arch\"<\/span>:<\/span> \"arm\"<\/span>,<\/span>\r\n\r\n \"linker\"<\/span>:<\/span> \"rust-lld\"<\/span>,<\/span>\r\n \"linker-flavor\"<\/span>:<\/span> \"ld.lld\"<\/span>,<\/span>\r\n \"pre-link-args\"<\/span>:<\/span> {<\/span>\r\n \"ld.lld\"<\/span>:<\/span> [<\/span>\r\n \"--script=linker.ld\"<\/span>\r\n ]<\/span>\r\n },<\/span>\r\n \"data-layout\"<\/span>:<\/span> \"e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64\"<\/span>,<\/span>\r\n \"executables\"<\/span>:<\/span> true<\/span>,<\/span>\r\n \"relocation-model\"<\/span>:<\/span> \"static\"<\/span>,<\/span>\r\n \"no-compiler-rt\"<\/span>:<\/span> true<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n\u6307\u5b9a\u3067\u304d\u308b\u9805\u76ee\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0b\u53c2\u7167<\/p>\n
\n- \n
rustc_target::spec::Target<\/ul>\n<\/li>\n<\/ul>\n <\/p>\n
rustc_target::spec::TargetOptions<\/ul>\n\u30dd\u30a4\u30f3\u30c8\u3068\u3057\u3066\u306f”–script=linker.ld”\u3067\u30ea\u30f3\u30ab\u30fc\u30b9\u30af\u30ea\u30d7\u30c8\uff08\u30c3\u5f8c\u8ff0\uff09\u3092\u6307\u5b9a\u3057\u3066\u3044\u308b\u3068\u3053\u308d\u3002
\nlinker.ld\u306f\u81ea\u524d\u306e\u30ea\u30f3\u30ab\u30fc\u30b9\u30af\u30ea\u30d7\u30c8\u3067\u3042\u3068\u3067\u4f5c\u6210\u3059\u308b\u3002<\/p>\n
\u30ea\u30f3\u30ab\u30fc\u30b9\u30af\u30ea\u30d7\u30c8<\/h1>\n\u30bb\u30af\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066<\/h2>\n
linker.ld\u89e3\u8aac\u306e\u524d\u306b\u30bb\u30af\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066\u5c11\u3057\u3060\u3051\u8aac\u660e\u3059\u308b\u3002
\n(C\/C++\u540c\u69d8)Rust\u3067\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u305f\u30b3\u30fc\u30c9\u3001\u30c7\u30fc\u30bf\u306f\u30bb\u30af\u30b7\u30e7\u30f3\u3068\u3044\u3046\u3082\u306e\u306b\u5c5e\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u3002<\/p>\n
\u5b9f\u969b\u306b\u898b\u3066\u307f\u308b\u3002
\n\/tmp\u7b49\u306b\u4ee5\u4e0b\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u3063\u3066<\/p>\n
#[no_mangle]<\/span>\r\npub<\/span> fn<\/span> hello<\/span>()<\/span> -><\/span> &<\/span>'static<\/span> str<\/span> {<\/span>\r\n \"Hello World\"<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3067\u30a2\u30bb\u30f3\u30d6\u30ea\u3092\u5410\u304b\u305b\u3066\u307f\u308b\u3002
\n(#[no_mangle]\u3092\u4ed8\u3051\u3066\u3044\u308b\u306e\u306f\u540d\u524d\u30de\u30f3\u30b0\u30ea\u30f3\u30b0\u3092\u6291\u5236\u3057\u7d50\u679c\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u3059\u308b\u305f\u3081\u3059\u308b\u305f\u3081)<\/p>\n
$ <\/span>rustc --emit<\/span> asm --crate-type<\/span> lib test.rs\r\n<\/code><\/pre>\n\u7d50\u679c\u306ftest.s\u306b\u51fa\u529b\u3055\u308c\u308b\u3002<\/p>\n
.text\r\n .file \"test.3a1fbbbh-cgu.0\"\r\n .section .text.hello,\"ax\",@progbits\r\n .globl hello\r\n .p2align 4, 0x90\r\n .type hello,@function\r\nhello:\r\n .cfi_startproc\r\n leaq .L__unnamed_1(%rip), %rax\r\n movl $11, %edx\r\n retq\r\n.Lfunc_end0:\r\n .size hello, .Lfunc_end0-hello\r\n .cfi_endproc\r\n\r\n .type .L__unnamed_1,@object\r\n .section .rodata..L__unnamed_1,\"a\",@progbits\r\n.L__unnamed_1:\r\n .ascii \"Hello World\"\r\n .size .L__unnamed_1, 11\r\n\r\n\r\n .section \".note.GNU-stack\",\"\",@progbits\r\n<\/code><\/pre>\n.section\u3067\u30bb\u30af\u30b7\u30e7\u30f3\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b\u3002
\n\u95a2\u6570hello()(\u30b3\u30fc\u30c9\u4e2d\u3067\u306f.globl hello)\u306f\u30bb\u30af\u30b7\u30e7\u30f3.text.hello\u3067\u3001\u6587\u5b57\u5217\u30ea\u30c6\u30e9\u30eb”Hello World”\u306f\u30bb\u30af\u30b7\u30e7\u30f3.rodata..L__unnamed_1\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308b\u3002<\/p>\n
\u30bb\u30af\u30b7\u30e7\u30f3\u540d\u306f\u5404\u8a00\u8a9e\u51e6\u7406\u7cfb\u304c\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u81ea\u7531\u306b\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u308b(Rust\u306e\u3088\u3046\u306b\u30e6\u30fc\u30b6\u30fc\u304c\u6307\u5b9a\u3067\u304d\u308b\u51e6\u7406\u7cfb\u3082\u3042\u308b)\u304c\u3001\u5171\u901a\u3067\u898b\u304b\u3051\u308b\u3081\u307c\u3057\u3044\u3082\u306e\u306f\u4ee5\u4e0b\u306e4\u3064\u3067\u3042\u308b\u3002<\/p>\n
\n\u30bb\u30af\u30b7\u30e7\u30f3\u540d\u5f79\u5272.text\u5b9f\u884c\u30b3\u30fc\u30c9\u9818\u57df.rodata(\u6587\u5b57\u5217\u306a\u3069\u306e)\u56fa\u5b9a\u30c7\u30fc\u30bf\u9818\u57df.data\u521d\u671f\u5316\u6e08\u307f\u30c7\u30fc\u30bf\u9818\u57df.bss\u521d\u671f\u5024\u30bc\u30ed\u306e\u30c7\u30fc\u30bf\u9818\u57df<\/div>\n<\/div>\n\u30ea\u30f3\u30ab\u30fc\u30b9\u30af\u30ea\u30d7\u30c8\u3068\u306f<\/h2>\n
\u30ea\u30f3\u30ab\u30fc\u30b9\u30af\u30ea\u30d7\u30c8\u306f\u3056\u3063\u304f\u308a\u3044\u3046\u3068\u3001\u4e0a\u3067\u8aac\u660e\u3057\u305f\u5404\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30e1\u30e2\u30ea\u4e0a\u306b\u3069\u306e\u3088\u3046\u306b\u914d\u7f6e\u3059\u308b\u304b\u6c7a\u3081\u308b\u305f\u3081\u306e\u3082\u306e\u3060\u3002<\/p>\n
\u666e\u6bb5\u306f\u610f\u8b58\u3057\u306a\u3044\u304c\u3001\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068<\/p>\n
$ <\/span>ld --verbose<\/span>\r\n<\/code><\/pre>\nGCC\u304c\u4f7f\u7528\u3057\u3066\u3044\u308b\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30ea\u30f3\u30ab\u30fc\u30b9\u30af\u30ea\u30d7\u30c8\u304c\u8868\u793a\u3055\u308c\u308b\uff08\u8868\u793a\u3055\u308c\u306a\u3044\u74b0\u5883\u3082\u3042\u308b\u304b\u3082\uff09\u3002
\n\u305f\u3060\u3057\u3053\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30ea\u30f3\u30ab\u30fc\u30b9\u30af\u30ea\u30d7\u30c8\u306fOS\uff08\u7b46\u8005\u306e\u74b0\u5883\u3060\u3068Linux\uff09\u4e0a\u3067\u52d5\u4f5c\u3059\u308b\u524d\u63d0\u306e\u30ea\u30f3\u30ab\u30fc\u30b9\u30af\u30ea\u30d7\u30c8\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u30d9\u30a2\u30e1\u30bf\u30eb\u3067\u52d5\u4f5c\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3059\u308b\u5834\u5408\u306f\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u3002<\/p>\n
linker.ld\u4f5c\u6210<\/h2>\n
\u3068\u3044\u3046\u308f\u3051\u3067\u4f5c\u6210\u3057\u305f\u81ea\u524d\u306e\u30ea\u30f3\u30ab\u30fc\u30b9\u30af\u30ea\u30d7\u30c8linker.ld\u304c\u4ee5\u4e0b\u3068\u306a\u308b\u3002<\/p>\n
\r\nSECTIONS\r\n{\r\n \/* Starts at LOADER_ADDR. *\/\r\n . = 0x8000;\r\n __start = .;\r\n __text_start = .;\r\n .text :\r\n {\r\n KEEP(*(.text.boot))\r\n *(.text)\r\n }\r\n . = ALIGN(4096); \/* align to page size *\/\r\n __text_end = .;\r\n\r\n __rodata_start = .;\r\n .rodata :\r\n {\r\n *(.rodata)\r\n }\r\n . = ALIGN(4096); \/* align to page size *\/\r\n __rodata_end = .;\r\n\r\n __data_start = .;\r\n .data :\r\n {\r\n *(.data)\r\n }\r\n . = ALIGN(4096); \/* align to page size *\/\r\n __data_end = .;\r\n\r\n __bss_start = .;\r\n .bss :\r\n {\r\n bss = .;\r\n *(.bss)\r\n }\r\n . = ALIGN(4096); \/* align to page size *\/\r\n __bss_end = .;\r\n\r\n __end = .;\r\n}\r\n<\/code><\/pre>\nRust\u306e\u30ea\u30f3\u30ab\u30fc\u306f\u30ea\u30f3\u30ab\u30fc\u30b9\u30af\u30ea\u30d7\u30c8\u306b\u3064\u3044\u3066GNU ld\u3068\u4e92\u63db\u304c\u3042\u308b\u306e\u3067\u7d30\u304b\u3044\u4ed5\u69d8\u306b\u3064\u3044\u3066\u306f$ info ld scripts\u3092\u898b\u3066\u3082\u3089\u3046\u306e\u304c\u826f\u3044\u3060\u308d\u3046\u3002<\/p>\n
\u30dd\u30a4\u30f3\u30c8\u306f\u30e9\u30ba\u30d0\u30a42\u306eCPU\u306f0x8000\u304b\u3089\u8aad\u307f\u8fbc\u307f\u3092\u958b\u59cb\u3059\u308b\u306e\u3067\u30010x8000\u306bsrc\/boot.S\u3067\u6307\u5b9a\u3057\u305f\u30bb\u30af\u30b7\u30e7\u30f3.text.boot\u3092\u914d\u7f6e\u3057\u3066\u3044\u308b\u3053\u3068\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u8d77\u52d5\u76f4\u5f8cboot.S\u306e\u5148\u982d\u304b\u3089\u5b9f\u884c\u304c\u958b\u59cb\u3055\u308c\u308b\u3053\u3068\u306b\u306a\u308b\u3002<\/p>\n
\u6700\u521d\u306e\u30d3\u30eb\u30c9\u3068\u5b9f\u884c<\/h1>\n
\u3053\u308c\u3067\u3088\u3046\u3084\u304f\u30d3\u30eb\u30c9\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3002\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u76f4\u4e0b\u3067\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3067\u30d3\u30eb\u30c9\u3059\u308b\u3002<\/p>\n
$ <\/span>cargo xbuild --target<\/span> armv7-none-eabihf.json\r\n<\/code><\/pre>\n\u306a\u304a\u3001linker.ld\u306f\u7de8\u96c6\u3057\u3066\u3082\u518d\u30d3\u30eb\u30c9\u3057\u3066\u304f\u308c\u306a\u3044\u306e\u3067\u8981\u6ce8\u610f\u3002<\/p>\n
\u30d3\u30eb\u30c9\u3067\u304d\u305f\u3089\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3067QEMU\u3092\u52d5\u304b\u3057\u3066\u307f\u308b\u3002<\/p>\n
$ <\/span>qemu-system-arm -M<\/span> raspi2 -kernel<\/span> target\/armv7-none-eabihf\/debug\/baremetal-raspi2 -d<\/span> guest_errors -d<\/span> in_asm\r\n<\/code><\/pre>\n\u4eca\u306e\u3068\u3053\u308d\u51fa\u529b\u3082\u4f55\u3082\u306a\u3044\u306e\u3067\u5b9f\u884c\u3057\u305f\u547d\u4ee4\u304c\u308f\u304b\u308b\u3088\u3046\u306b\u30aa\u30d7\u30b7\u30e7\u30f3-d in_asm\u3092\u6307\u5b9a\u3057\u3066\u3044\u308b\u3002
\n\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3002<\/p>\n
----------------\r\nIN:\r\n0x00008000: e320f002 wfe\r\n0x00008004: eafffffd b #0x8000\r\n\r\n----------------\r\nIN:\r\n0x00008000: e320f002 wfe\r\n0x00008004: eafffffd b #0x8000\r\n\r\n----------------\r\nIN:\r\n0x00008000: e320f002 wfe\r\n0x00008004: eafffffd b #0x8000\r\n\r\n----------------\r\nIN:\r\n0x00008000: e320f002 wfe\r\n0x00008004: eafffffd b #0x8000\r\n<\/code><\/pre>\n\u306a\u3093\u3068\u306a\u304fboot.S\u306e\u5185\u5bb9\u304c\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u308f\u304b\u308b\u3068\u601d\u3046\u30024\u3064\u51fa\u3066\u3044\u308b\u306e\u306f\u30e9\u30ba\u30d1\u30a42\u306b\u306f\u30b3\u30a2\u304c4\u3064\u3042\u308b\u305f\u3081\u3002<\/p>\n
Tips<\/h1>\n\u30b3\u30a21\u301c3\u3092\u6b62\u3081\u308b<\/h2>\n
\u4e0a\u306b\u66f8\u3044\u305f\u3068\u304a\u308a\u30e9\u30ba\u30d1\u30a42\u3067\u306f4\u3064\u306e\u30b3\u30a2\u304c\u540c\u6642\u306b\u52d5\u304d\u51fa\u30570x8000\u304b\u3089\u5b9f\u884c\u3092\u958b\u59cb\u3057\u3066\u3057\u307e\u3046\u3002\u3053\u308c\u306f\u5f8c\u3005\u3044\u308d\u3044\u308d\u3068\u90fd\u5408\u304c\u60aa\u3044\u306e\u3067\u5f53\u9762\u306e\u9593\u30b3\u30a21\u301c3\u306b\u306f\u5bdd\u3066\u3066\uff08\u7121\u9650\u30eb\u30fc\u30d7\u3057\u3066\uff09\u3082\u3089\u3046\u3053\u3068\u306b\u3059\u308b\u3002<\/p>\n
\/\/ disable core1-3\r\n mrc p15, 0, r1, c0, c0, 5\r\n and r1, r1, #3\r\n cmp r1, #0\r\n beq 2f\r\n\r\n1: wfe\r\n b 1b\r\n2:\r\n<\/code><\/pre>\n\u30b3\u30d7\u30ed\u304b\u3089\u30b3\u30a2\u306eID\u3092\u53d6\u5f97\u3057\u3066\u304d\u30660\u306a\u3089\u30e9\u30d9\u30eb2\u3078\u3001\u305d\u308c\u4ee5\u5916\u306a\u3089\u30e9\u30d9\u30eb1\u3067\u7121\u9650\u30eb\u30fc\u30d7\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u3002<\/p>\n
NEON\u306e\u6709\u52b9\u5316<\/h2>\n
\u4e0a\u3067\u66f8\u3044\u305farmv7-none-eabihf.json\u3060\u304c\u3001\u3053\u308c\u306b\u5f93\u3063\u3066\u30d3\u30eb\u30c9\u3059\u308b\u3068SIMD\u6f14\u7b97\u5668\u3067\u3042\u308bNEON\u30b3\u30d7\u30ed\u30bb\u30c3\u30b5\u3092\u4f7f\u7528\u3059\u308b\u30b3\u30fc\u30c9\u304c\u751f\u6210\u3055\u308c\u308b\u3002
\n\u3057\u304b\u3057\u30e9\u30ba\u30d1\u30a42\u306e\u8d77\u52d5\u6642\u306b\u306fNEON\u30b3\u30d7\u30ed\u30bb\u30c3\u30b5\u306f\u7121\u52b9\u306b\u306a\u3063\u3066\u3044\u308b\u305f\u3081\u3001NEON\u7528\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u300c\u672a\u5b9a\u7fa9\u547d\u4ee4\u4f8b\u5916\u300d\u304c\u767a\u751f\u3057\u3066\u3057\u307e\u3046\u3002<\/p>\n
boot.S\u306b\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3067NEON\u30b3\u30d7\u30ed\u30bb\u30c3\u30b5\u304c\u6709\u52b9\u3068\u306a\u308a\u300c\u672a\u5b9a\u7fa9\u547d\u4ee4\u4f8b\u5916\u300d\u306f\u767a\u751f\u3057\u306a\u304f\u306a\u308b\u3002<\/p>\n
\/\/ enable NEON\/VFP\r\n ldr r0, =(0xF << 20)\r\n mcr p15, 0, r0, c1, c0, 2\r\n mov r3, #0x40000000\r\n vmsr FPEXC, r3\r\n<\/code><\/pre>\n\u3053\u306e\u3042\u3068\u306f\uff1f<\/h1>\n
\u9577\u304f\u306a\u3063\u3066\u3057\u307e\u3063\u305f\u306e\u3067\u3053\u3053\u3067\u4e00\u65e6\u7d42\u308f\u308a\u3068\u3059\u308b\u3002
\n\u6b21\u56de\u306f\u5272\u308a\u8fbc\u307f\u30d9\u30af\u30bf\u306e\u8a2d\u5b9a\u3092\u304a\u3053\u306a\u3044\u3001\u30b7\u30ea\u30a2\u30eb\u304b\u3089\u306e\u5165\u529b\u3092\u30a8\u30b3\u30fc\u30d0\u30c3\u30af\u3059\u308b\u3068\u3053\u308d\u307e\u3067\u3092\u66f8\u304d\u305f\u3044\u3002<\/p>\n
\u307e\u305f\u30d9\u30a2\u30e1\u30bf\u30eb\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3068\u3057\u3066\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3082\u66f8\u3044\u305f\u306e\u3067\u53c2\u8003\u306b\u3057\u3066\u3082\u3089\u3044\u305f\u3044\u3002<\/p>\n
\n- \n
[Rust] \u30e9\u30ba\u30d1\u30a42\u3067\u30d9\u30a2\u30e1\u30bf\u30eb\u30e1\u30e2\u30ea\u30a2\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3<\/ul>\n<\/li>\n<\/ul>\n <\/p>\n
[Rust] \u30e9\u30ba\u30d1\u30a42\u3067\u30d9\u30a2\u30e1\u30bf\u30eb\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30b9\u30a4\u30c3\u30c1<\/ul>\n\u53c2\u8003URL<\/h1>\n","protected":false},"excerpt":{"rendered":"
Rust\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u304b\u3089QEMU\u4e0a\u306e\u30e9\u30ba\u30d1\u30a42\u3067\u30d9\u30a2\u30e1\u30bf\u30eb(OS\u306a\u3057)\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u52d5\u4f5c\u3059\u308b\u3068\u3053\u308d\u307e\u3067\u3092\u89e3\u8aac […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45769","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\/45769-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"Rust\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u304b\u3089QEMU\u4e0a\u306e\u30e9\u30ba\u30d1\u30a42\u3067\u30d9\u30a2\u30e1\u30bf\u30eb(OS\u306a\u3057)\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u52d5\u4f5c\u3059\u308b\u3068\u3053\u308d\u307e\u3067\u3092\u89e3\u8aac […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45769-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-04-11T12:05:32+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-03T16:53:56+00:00\" \/>\n<meta name=\"author\" content=\"\u65b0, \u97f5\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u65b0, \u97f5\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/45769-2\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/45769-2\/\",\"name\":\"- Blog - 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