Exec format error for multicore

[ChiaLiu0618]

Hi, I tried running it with just one tile. While there don't appear to be any errors based on the terminal messages, my perf.log file is still empty. Is this expected behavior, or could there be an issue? Thank you ~

[Jbalkind]

IIRC the perf.log file is only used for the OpenSPARC T1 core. As it is now, we don't have a mechanism to check which core is in use and avoid this, but it could be done in the near future with a different PR I'm merging.

It does seem like the broader issue/bug with verilator failing on multicore is still the case. It would be good to dig in this. Not sure who will have time to do so, though. Any volunteers reading this would be very welcome :)

[ChiaLiu0618]

Hi, we’ve been trying to run assembly code on the OpenPiton multicore, but it seems that the code isn't properly linked to the riscv_test.h and test_macros.h header files. Do you have any suggestions on what could be the issue, or where I should place these files to resolve the problem?

Thank you~

[Jbalkind]

I think I see two main issues here:

1. I think the test you're running is the 32 bit riscv test for PicoRV32, not 64 bit for Ariane? - If so, that test won't run with 4 cores without modifications. We also don't have a 64 bit asm test compilation flow at present. You could look at this repo/branch for the 64 bit asm flow if you really wanted to adapt it: https://github.com/bring-your-own-core/byoc/tree/anycore
2. You're building from source instead of using a precompiled binary. I would suggest that you pre-build the riscv assembly tests and then make use of the -precompiled argument to sims to run the precompiled binary. The readme gives some partial instructions on this

[ChiaLiu0618]

Hi, I’d like to ask if the rv64ui-p-addi.S file located at ~/openpiton/piton/design/chip/tile/ariane/tmp/riscv-tests/build/isa is the compiled binary version of the addi.S file located at ~/openpiton/piton/design/chip/tile/ariane/tmp/riscv-tests/isa/rv64ui? Thank you~

[Jbalkind]

Do you mean the .riscv file (I think that's the extension)? To the best of my knowledge, it should be, yes. You can use -precompiled to run that test. I think the readme should have an example

[ChiaLiu0618]

Hi, I was trying to reduce the sims.log file by minimizing the number of instructions, but I encountered a bad trap. Does the sims.log still capture the transmission behavior, or is the bad trap message fatal? I ran the following command:
sims -sys=manycore -vlt_run -x_tiles=2 -y_tiles=2 addi_example.s -ariane -finish_mask=1111 -rtl_timeout 100000. The attached are my terminal, code, and sims.log. Thank you~ sims.log

[Jbalkind]

Bad trap corresponds with the core's PC going to the "fail" label in the program's binary. You should be able to use your riscv64 objdump (or check diag.dump) to see what address that label exists at. From that you should be able to trace why the program reached that PC, based on your modifications.