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elaborate/update json in blog

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janis 2026-07-17 16:22:42 +02:00
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blog/intro.org
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@ -109,32 +109,33 @@ As is, attempting to build this code will throw linker errors, because cargo wil
#+begin_src json #+begin_src json
{ {
"arch": "x86_64", "arch": "x86_64",
"code-model": "kernel", "code-model": "kernel",
"cpu": "x86-64", "cpu": "x86-64",
"crt-objects-fallback": "false", "crt-objects-fallback": "false",
"data-layout": "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128", "data-layout": "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128",
"disable-redzone": true, "disable-redzone": true,
"target-endian": "little", "target-endian": "little",
"features": "-mmx,-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2,+soft-float", "features": "-mmx,-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2,+soft-float",
"linker": "mold", "linker": "rust-lld",
"linker-flavor": "gnu", "linker-flavor": "ld.lld",
"llvm-target": "x86_64-unknown-none-elf", "llvm-target": "x86_64-unknown-none-elf",
"max-atomic-width": 64, "max-atomic-width": 64,
"panic-strategy": "abort", "panic-strategy": "abort",
"plt-by-default": false, "plt-by-default": false,
"position-independent-executables": true, "os": "none",
"relro-level": "full", "executables": true,
"rustc-abi": "softfloat", "relro-level": "full",
"stack-probes": { "rustc-abi": "softfloat",
"kind": "inline" "stack-probes": {
}, "kind": "inline"
"static-position-independent-executables": true, },
"supported-sanitizers": [ "supported-sanitizers": [
"kcfi", "kcfi",
"kernel-address" "kernel-address"
], ],
"target-pointer-width": 64 "target-pointer-width": 64,
"target-c-int-width": 32
} }
#+end_src #+end_src
@ -148,6 +149,8 @@ More options available in the current rustc can be found by running the followin
rustc -Zunstable-options --print target-spec-json-schema rustc -Zunstable-options --print target-spec-json-schema
#+end_src #+end_src
Notably, I have not copied the =*position-independent-executables= fields from the =x86_64-unknown-none-elf= target, because we will later use a linker script to place our kernel in the higher-half of the address space and modify the layout of our sections manually, and position independent executables complicate this.
If we now attempt to build our kernel, cargo will now complain that it cannot find the =core= crate since it is not available for our custom target: If we now attempt to build our kernel, cargo will now complain that it cannot find the =core= crate since it is not available for our custom target:
#+begin_src bash #+begin_src bash
cargo -Zjson-target-spec build --target x86_64-unknown-kernel.json cargo -Zjson-target-spec build --target x86_64-unknown-kernel.json