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adding support for clang relocations #102

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wants to merge 16 commits into from
Closed

adding support for clang relocations #102

wants to merge 16 commits into from

Commits on Jul 13, 2022

  1. Separate out JITting from interpreting 

    This patch separates out the JITter from the interpreter.  It adds a
"null" JIT which just errors out.

After this patch is applied it is possible to build on non-x86-64
platforms and run the interpreter without worrying about the JIT.

This is achieved by adding a translate function-pointer member to
the ubpf_vm struct. ubpf_create() then sets the pointer up to the
correct JIT.  Finally ubpf_translate() now delegates to that function
pointer.

To enable code reuse some common code from ubpf_jit_x86_64.c is moved
into a new file ubpf_jit.c.

Also what was ubpf_translate() in ubpf_jit_x86_64.c is renmaed
ubpf_translate_x86_64.c.

The build process assumes that all backends can be compiled on all
platforms.  It then relies on the linker to not link in unused backends.

The code also assumes that only the JIT backend targeting the platform
the code is run on will is needed.

Finally, the testing infrastructure is updated to support non-x86-64
platforms.
    @mdr78
    Matthew Gretton-Dann authored and mdr78 committed Jul 13, 2022
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  2. Work around test_elf failures 

    The elf tests fail on Arm but not x86-64.  This seems to be due to the
local field of st_other not eing set on symbols.

We work around this issue by setting local to 0 on all symbols.  This is
a good catch-all value as it generally means "default".
    @mdr78
    Matthew Gretton-Dann authored and mdr78 committed Jul 13, 2022
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  3. Fix address sanitizer failures.

    @mdr78
    Matthew Gretton-Dann authored and mdr78 committed Jul 13, 2022
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  4. Added memfrob impl. for musl

    @jpsamaroo @mdr78
    jpsamaroo authored and mdr78 committed Jul 13, 2022
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  5. Added endian.h header for musl

    @jpsamaroo @mdr78
    jpsamaroo authored and mdr78 committed Jul 13, 2022
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  6. Expose VM registers. 

    This can be useful to:
- Inspect registers after program execution.
- Determine where registers should be stored.

Signed-off-by: Martin Ichilevici de Oliveira <martin.i.oliveira@gmail.com>
    @iomartin @mdr78
    iomartin authored and mdr78 committed Jul 13, 2022
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  7. Add initial Arm64 JIT implementation 

    This adds initial implementation of the Arm64 JIT.
    @mdr78
    Matthew Gretton-Dann authored and mdr78 committed Jul 13, 2022
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  8. Enable Arm64 JIT testing

    @mdr78
    Matthew Gretton-Dann authored and mdr78 committed Jul 13, 2022
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  9. Add test for large offset loads/stores.

    @mdr78
    Matthew Gretton-Dann authored and mdr78 committed Jul 13, 2022
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  10. Update README.md with Arm64 support.

    @mdr78
    Matthew Gretton-Dann authored and mdr78 committed Jul 13, 2022
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  11. cmake: Initial commit

    @alessandrogario @mdr78
    alessandrogario authored and mdr78 committed Jul 13, 2022
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  12. Revert "Add: CMake, CI, macOS/Windows support, packaging, scan-build"

    @Alan-Jowett @mdr78
    Alan-Jowett authored and mdr78 committed Jul 13, 2022
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  13. vm: include ubpf_jit.o in dynamic library

    @yoursunny @mdr78
    yoursunny authored and mdr78 committed Jul 13, 2022
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  14. cmake: Initial commit

    @alessandrogario @mdr78
    alessandrogario authored and mdr78 committed Jul 13, 2022
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  15. make: Add missing ubpf_config.h generator

    @alessandrogario @mdr78
    alessandrogario authored and mdr78 committed Jul 13, 2022
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  16. adding support for clang relocations 

    Added support for clang function and string relocations, these show as up as
R_BPF_64_64 and R_BPF_64_32 in *-readelf relocations. Support for nosetests elf
tests is still TBD.

Signed-off-by: Ray Kinsella <mdr@ashroe.eu>
    @mdr78
    mdr78 committed Jul 13, 2022
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