[llvm-dev] Hardware ASan Generating Unknown Instruction

[Mitch Phillips via llvm-dev]

Hi Derrick,

Can you send through `test.c`? What does clang's assembly say
(`path/to/compiled/clang --target=aarch64-linux-gnu -march=armv8.5-a
-fsanitize=hwaddress -S test.c; cat test.s`)?

- Mitch

On Mon, Jun 22, 2020 at 12:04 PM Derrick McKee via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi,
>
> I am trying to execute a simple hello world program compiled like so:
>
> path/to/compiled/clang -o test --target=aarch64-linux-gnu
> -march=armv8.5-a -fsanitize=hwaddress
> --sysroot=/usr/aarch64-linux-gnu/
> -L/usr/lib/gcc/aarch64-linux-gnu/10.1.0/ -g test.c
>
> However, when I look at the disassembly, there is an unknown
> instruction listed at 0x2d51c:
>
> 000000000002d4c0 main:
>    2d4c0: ff c3 00 d1                      sub    sp, sp, #48
>    2d4c4: fd 7b 02 a9                      stp    x29, x30, [sp, #32]
>    2d4c8: fd 83 00 91                      add    x29, sp, #32
>    2d4cc: 08 01 00 d0                      adrp    x8, #139264
>    2d4d0: 08 49 47 f9                      ldr    x8, [x8, #3728]
>    2d4d4: 49 d0 3b d5                      mrs    x9, TPIDR_EL0
>    2d4d8: 28 69 68 f8                      ldr    x8, [x9, x8]
>    2d4dc: 08 7d 40 b2                      orr    x8, x8, #0xffffffff
>    2d4e0: 08 05 00 91                      add    x8, x8, #1
>    2d4e4: a2 13 00 d1                      sub    x2, x29, #4
>    2d4e8: e9 03 08 aa                      mov    x9, x8
>    2d4ec: df 64 ff 97                      bl    #-158852
> <__hwasan_check_x2_18_short>
>    2d4f0: ea 03 1f 2a                      mov    w10, wzr
>    2d4f4: aa c3 1f b8                      stur    w10, [x29, #-4]
>    2d4f8: a2 23 00 d1                      sub    x2, x29, #8
>    2d4fc: e9 03 08 aa                      mov    x9, x8
>    2d500: da 64 ff 97                      bl    #-158872
> <__hwasan_check_x2_18_short>
>    2d504: a0 83 1f b8                      stur    w0, [x29, #-8]
>    2d508: e2 43 00 91                      add    x2, sp, #16
>    2d50c: e9 03 08 aa                      mov    x9, x8
>    2d510: ec 64 ff 97                      bl    #-158800
> <__hwasan_check_x2_19_short>
>    2d514: e1 0b 00 f9                      str    x1, [sp, #16]
>    2d518: 40 00 00 d0                      adrp    x0, #40960
>    2d51c: e0 ff e5 b2                      <unknown>
>    2d520: 00 40 35 91                      add    x0, x0, #3408
>    2d524: ea 0f 00 b9                      str    w10, [sp, #12]
>    2d528: c2 64 ff 97                      bl    #-158968 <printf at plt>
>    2d52c: ea 0f 40 b9                      ldr    w10, [sp, #12]
>    2d530: e0 0b 00 b9                      str    w0, [sp, #8]
>    2d534: e0 03 0a 2a                      mov    w0, w10
>    2d538: fd 7b 42 a9                      ldp    x29, x30, [sp, #32]
>    2d53c: ff c3 00 91                      add    sp, sp, #48
>    2d540: c0 03 5f d6                      ret
>
>
> Am I compiling the program incorrectly?  For reference, here's my clang
> version
>
> # llvm-project/build-10.x/install/bin/clang --version
>                                              [1]
> clang version 10.0.1 (git at github.com:llvm/llvm-project.git
> a634a80615b1e012f1a61aa0cd1e2e67ef77d0bd)
> Target: x86_64-unknown-linux-gnu
> Thread model: posix
>
> --
> Derrick McKee
> Phone: (703) 957-9362
> Email: derrick.mckee at gmail.com
> _______________________________________________
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> llvm-dev at lists.llvm.org
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>
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