Generate correct symbols.o for sparc-unknown-none-elf #131222
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Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @nnethercote (or someone else) some time within the next two weeks. Please see the contribution instructions for more information. Namely, in order to ensure the minimum review times lag, PR authors and assigned reviewers should ensure that the review label (
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Before: $ cargo +nightly run --release -Zbuild-std=core
Compiling compiler_builtins v0.1.123
Compiling core v0.0.0 (/home/jonathan/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core)
Compiling rustc-std-workspace-core v1.99.0 (/home/jonathan/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core)
Compiling sparc-demo-rust v0.1.0 (/home/jonathan/Documents/github/sparc-experiments/sparc-demo-rust)
error: linking with `sparc-gaisler-elf-clang` failed: exit status: 1
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= note: LC_ALL="C" PATH="/home/jonathan/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/home/jonathan/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/home/jonathan/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/home/jonathan/Documents/github/sparc-experiments/sparc-demo-rust/tsim-eval/tsim/linux-x64:/home/jonathan/Documents/github/sparc-experiments/sparc-demo-rust/sparc-bcc-2.3.0-llvm/bin:/home/jonathan/.cargo/bin:/usr/local/bin:/usr/bin:/bin:/usr/games:/home/jonathan/.local/bin" VSLANG="1033" "sparc-gaisler-elf-clang" "/tmp/rustc5XTXaN/symbols.o" "/home/jonathan/Documents/github/sparc-experiments/sparc-demo-rust/target/sparc-unknown-none-elf/release/deps/sparc_demo_rust-dda8726ad5b0a340.sparc_demo_rust.d5175a5ce72ae1e3-cgu.0.rcgu.o" "-Wl,--as-needed" "-Wl,-Bstatic" "/home/jonathan/Documents/github/sparc-experiments/sparc-demo-rust/target/sparc-unknown-none-elf/release/deps/libcompiler_builtins-543ae673c75fcb78.rlib" "-Wl,-Bdynamic" "-Wl,-z,noexecstack" "-o" "/home/jonathan/Documents/github/sparc-experiments/sparc-demo-rust/target/sparc-unknown-none-elf/release/deps/sparc_demo_rust-dda8726ad5b0a340" "-Wl,--gc-sections" "-no-pie" "-mcpu=leon3" "-latomic"
= note: sparc-gaisler-elf-clang: warning: argument unused during compilation: '-nopie' [-Wunused-command-line-argument]
/home/jonathan/Documents/github/sparc-experiments/sparc-demo-rust/sparc-bcc-2.3.0-llvm/bin/sparc-gaisler-elf-ld: unknown architecture of input file `/tmp/rustc5XTXaN/symbols.o' is incompatible with sparc output
sparc-gaisler-elf-clang: error: ld command failed with exit code 1 (use -v to see invocation)
error: could not compile `sparc-demo-rust` (bin "sparc-demo-rust") due to 1 previous errorAfter: $ cargo +stage1 run --release
Compiling sparc-demo-rust v0.1.0 (/home/jonathan/Documents/github/sparc-experiments/sparc-demo-rust)
Finished `release` profile [optimized + debuginfo] target(s) in 0.41s
Running `tsim-leon3 -c sim-commands.txt target/sparc-unknown-none-elf/release/sparc-demo-rust`
TSIM3 LEON3 SPARC simulator, version 3.1.11 (evaluation version)
Copyright (C) 2024, Frontgrade Gaisler - all rights reserved.
This software may only be used with a valid license.
For latest updates, go to https://www.gaisler.com/
Comments or bug-reports to [email protected]
This TSIM evaluation version will expire 2024-11-03
Number of CPUs: 2
system frequency: 50.000 MHz
icache: 1 * 4 KiB, 16 bytes/line (4 KiB total)
dcache: 1 * 4 KiB, 16 bytes/line (4 KiB total)
Allocated 8192 KiB SRAM memory, in 1 bank at 0x40000000
Allocated 32 MiB SDRAM memory, in 1 bank at 0x60000000
Allocated 8192 KiB ROM memory at 0x00000000
section: .text, addr: 0x40000000, size: 34304 bytes
section: .rodata, addr: 0x40008600, size: 3760 bytes
section: .data, addr: 0x400094b0, size: 1176 bytes
read 431 symbols
Initializing and starting from 0x40000000
Hello, this is Rust!
0 1 2 3 4 5 6 7 8 9
0: 0 0 0 0 0 0 0 0 0 0
1: 0 1 2 3 4 5 6 7 8 9
2: 0 2 4 6 8 10 12 14 16 18
3: 0 3 6 9 12 15 18 21 24 27
4: 0 4 8 12 16 20 24 28 32 36
5: 0 5 10 15 20 25 30 35 40 45
6: 0 6 12 18 24 30 36 42 48 54
7: 0 7 14 21 28 35 42 49 56 63
8: 0 8 16 24 32 40 48 56 64 72
9: 0 9 18 27 36 45 54 63 72 81
PANIC: PanicInfo { message: I am a panic, location: Location { file: "src/main.rs", line: 56, col: 5 }, can_unwind: true, force_no_backtrace: fals
Program exited normally on CPU 0 |
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This seems fine to me but the discussion in #130172 is complex enough that I will defer to... |
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I mulled this over for a bit, basically wrote a blog post worth of my thoughts on how silly this case was, then did some research and found something interesting: clang recognizes a lot more than just "v8" and "v9", but fortunately they encode v8 and v9ness.
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Ah apparently that codegen attribute is actually fairly recent: llvm/llvm-project#98713 So not in LLVM 19... nevermind. Okay, doing some fiddling and more reading, I was missing a detail: LLVM has a fairly... idiosyncratic... way of doing option parsing. So they do recognize all the V8+ CPUs independently, it's not entirely up to Clang. Whew! |
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Ah, it's from this, which turns into some generated files of C++ and such: https://github.com/llvm/llvm-project/blob/eaff3a743406ff1636e6328e1ba1bc66318d53cb/llvm/lib/Target/Sparc/Sparc.td#L115-L200 The slightly more complicated pattern-match required for handling the Niagara and UltraSPARC processors doesn't seem too bad. |
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But if this makes Leon 3 bare metal work and 32-bit on 64-bit SPARC Linux work, that's ok for now right? |
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Yes, I'm just saying that it should recognize the other "v9" CPUs as well, which are these: So, v9, ultrasparc, ultrasparc3, niagara, niagara2, niagara3, niagara4. |
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I was unable to find a 32-bit SPARC gcc for Linux (Debian bookworm) so sadly I can't test. |
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The built in SPARC Linux target says |
FWIW, I used to be able to test using g++-multilib-sparc64 on Ubuntu/Debian and -m32 flag (taiki-e/setup-cross-toolchain-action@ea9aca6), but since the nightly a while ago, the build has been broken with the "file in wrong format" error (taiki-e/setup-cross-toolchain-action@8953e6c, probably related to d1d21ed, considering when the error occurred). |
Correct. |
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@glaubitz does this change work for you? |
Then your toolchain defaults to SPARC V7 which is not what Debian's GCC does.
I need to test this first. Please give me the time over the weekend as I'm currently busy with other stuff. |
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Auditing Debian's toolchain, it seems Debian carries multiple patches for SPARC that they apparently have yet to submit to GCC. Can you link to the specific patchset your toolchain was built with, so we can be sure this isn't all a problem introduced by Debian's patches in the first place? |
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Did you have a chance to look at this one, @glaubitz ? |
Not yet. I'll try to get it done over the weekend. |
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Working on this now. Sorry, I was on a business trip this week and didn't have any time to look into it. |
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So, I tried building the current git master for 32-bit SPARC and it didn't build due to LLVM requiring Does it build for you for Leon with this patch applied? |
which target? |
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I haven't tried this patch on master, only the exact contents of this PR as per the opening message. I used Gaisler's toolchain and my pre-existing example repository. I'm hoping you can tell me if I broke SPARC Linux or not because I can't find a SPARC Linux toolchain for my Debian Stable box to do the testing. |
That was |
I built the toolchain myself from source but I'm working on enabling the 32-bit SPARC toolchain by default now so it can just be installed from source. This also makes cross-building 32-bit kernels on Debian easier. |
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I thought |
The kernel is usually UltraSPARC, but the userland can be both 32- and 64-bit. Most Linux distributions preferred a 32-bit userland in the past. On Gentoo, you can still chose between the two. |
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TIL! |
what linker? specific commit, please. |
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Can we just merge this and look at resolving any SPARC Linux issues in a subsequent commit? |
These all enable the v9 target feature, so I think it would be better to refer to the v9 target feature (like #132472 (comment)) rather than parsing the cpu string. |
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…kingjubilee Rollup of 4 pull requests Successful merges: - rust-lang#131222 (Generate correct symbols.o for sparc-unknown-none-elf) - rust-lang#132423 (remove const-support for align_offset and is_aligned) - rust-lang#132565 (Reduce dependence on the target name) - rust-lang#132576 (remove attribute ids from hir stats (they're simply not needed)) r? `@ghost` `@rustbot` modify labels: rollup
Rollup merge of rust-lang#131222 - thejpster:fix-sparc-v7-symbol-o, r=workingjubilee Generate correct symbols.o for sparc-unknown-none-elf This fixes rust-lang#130172 by selecting the correct ELF Machine type for sparc-unknown-none-elf (which has a baseline of SPARC V7).
…rkingjubilee Add v9, v8plus, and leoncasa target feature to sparc and use v8plus in create_object_file This adds the following three unstable target features: - `v9`: SPARC-V9 instructions ([LLVM definition][sparc-v9]) - Relevant to rust-lang#131222 (comment) - Relevant to rust-lang#132472 (comment) - This is also needed to implement taiki-e/atomic-maybe-uninit#31 (depends on inline assembly support) more robustly. - `v8plus`: SPARC-V8+ ABI ([LLVM definition][sparc-v8plus]) - This is added in LLVM 20. In LLVM 19 and older, it is emulated to work the same way as LLVM in each LLVM version. - See rust-lang#132585 (comment) for more. - `leoncasa`: CASA instruction[^1] of LEON3 and LEON4 processors ([LLVM definition][sparc-leoncasa], LLVM feature name: `hasleoncasa`) - This is needed to implement taiki-e/atomic-maybe-uninit#31 (depends on inline assembly support) more robustly. [^1]: Atomic CAS instruction [sparc-v9]: https://github.com/llvm/llvm-project/blob/f5e4ffaa49254706ad6fa209de8aec28e20f0041/llvm/lib/Target/Sparc/Sparc.td#L37-L39 [sparc-v8plus]: https://github.com/llvm/llvm-project/blob/f5e4ffaa49254706ad6fa209de8aec28e20f0041/llvm/lib/Target/Sparc/Sparc.td#L37-L39 [sparc-leoncasa]: https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/Sparc/LeonFeatures.td#L32-L37
Rollup merge of rust-lang#132552 - taiki-e:sparc-target-feature, r=workingjubilee Add v9, v8plus, and leoncasa target feature to sparc and use v8plus in create_object_file This adds the following three unstable target features: - `v9`: SPARC-V9 instructions ([LLVM definition][sparc-v9]) - Relevant to rust-lang#131222 (comment) - Relevant to rust-lang#132472 (comment) - This is also needed to implement taiki-e/atomic-maybe-uninit#31 (depends on inline assembly support) more robustly. - `v8plus`: SPARC-V8+ ABI ([LLVM definition][sparc-v8plus]) - This is added in LLVM 20. In LLVM 19 and older, it is emulated to work the same way as LLVM in each LLVM version. - See rust-lang#132585 (comment) for more. - `leoncasa`: CASA instruction[^1] of LEON3 and LEON4 processors ([LLVM definition][sparc-leoncasa], LLVM feature name: `hasleoncasa`) - This is needed to implement taiki-e/atomic-maybe-uninit#31 (depends on inline assembly support) more robustly. [^1]: Atomic CAS instruction [sparc-v9]: https://github.com/llvm/llvm-project/blob/f5e4ffaa49254706ad6fa209de8aec28e20f0041/llvm/lib/Target/Sparc/Sparc.td#L37-L39 [sparc-v8plus]: https://github.com/llvm/llvm-project/blob/f5e4ffaa49254706ad6fa209de8aec28e20f0041/llvm/lib/Target/Sparc/Sparc.td#L37-L39 [sparc-leoncasa]: https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/Sparc/LeonFeatures.td#L32-L37
…rkingjubilee Add v9, v8plus, and leoncasa target feature to sparc and use v8plus in create_object_file This adds the following three unstable target features: - `v9`: SPARC-V9 instructions ([LLVM definition][sparc-v9]) - Relevant to rust-lang#131222 (comment) - Relevant to rust-lang#132472 (comment) - This is also needed to implement taiki-e/atomic-maybe-uninit#31 (depends on inline assembly support) more robustly. - `v8plus`: SPARC-V8+ ABI ([LLVM definition][sparc-v8plus]) - This is added in LLVM 20. In LLVM 19 and older, it is emulated to work the same way as LLVM in each LLVM version. - See rust-lang#132585 (comment) for more. - `leoncasa`: CASA instruction[^1] of LEON3 and LEON4 processors ([LLVM definition][sparc-leoncasa], LLVM feature name: `hasleoncasa`) - This is needed to implement taiki-e/atomic-maybe-uninit#31 (depends on inline assembly support) more robustly. [^1]: Atomic CAS instruction [sparc-v9]: https://github.com/llvm/llvm-project/blob/f5e4ffaa49254706ad6fa209de8aec28e20f0041/llvm/lib/Target/Sparc/Sparc.td#L37-L39 [sparc-v8plus]: https://github.com/llvm/llvm-project/blob/f5e4ffaa49254706ad6fa209de8aec28e20f0041/llvm/lib/Target/Sparc/Sparc.td#L37-L39 [sparc-leoncasa]: https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/Sparc/LeonFeatures.td#L32-L37
This fixes #130172 by selecting the correct ELF Machine type for sparc-unknown-none-elf (which has a baseline of SPARC V7).