Documentation | Rust Documentation: Hello World on SPARC does not work anymore (#32)

[Frank Kuehndel (@frank_k)]

Frank Kuehndel created an issue: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/issues/32



## Summary

Executing the exact instructions from the [rtems user manual](https://docs.rtems.org/branches/master/user/rust/bare-metal.html#bare-metal-rust-with-rtems) results in a `hello_rtems_sparc.exe` executable that when run does not print `Hello from Rust` (but crashes)? Currently, the output looks like:

```
RTEMS Testing - Run, 6.0.not_released
 Command Line: /opt/rtems/6/bin/rtems-run --rtems-bsp=leon3-sis hello_rtems_sparc.exe
 Host: Linux dbcc3c47aca7 5.14.21-150500.55.68-default #1 SMP PREEMPT_DYNAMIC Wed Jun 5 21:39:05 UTC 2024 (40e256a) x86_64
 Python: 3.12.3 (main, Jul 31 2024, 17:43:48) [GCC 13.2.0]
Host: Linux-5.14.21-150500.55.68-default-x86_64-with-glibc2.39 (Linux dbcc3c47aca7 5.14.21-150500.55.68-default #1 SMP PREEMPT_DYNAMIC Wed Jun 5 21:39:05 UTC 2024 (40e256a) x86_64 x86_64)
 SIS - SPARC/RISCV instruction simulator 2.30,  copyright Jiri Gaisler 2020
 Bug-reports to jiri at gaisler.se
 LEON3 emulation enabled, 4 cpus online, delta 50 clocks
 Loaded hello_rtems_sparc.exe, entry 0x40000000
cpu 0 in error mode (tt = 0x02)
   186150  40019314:  02d48b00   unknown opcode: 0x02d48b00
Run time     : 0:00:00.254975
```

But it should look like:

```
RTEMS Testing - Run, 6.0.not_released
 Command Line: /opt/rtems/6/bin/rtems-run --rtems-bsp=leon3-sis hello_rtems_sparc.exe
 Host: Linux 22a657516d60 5.14.21-150500.55.68-default #1 SMP PREEMPT_DYNAMIC Wed Jun 5 21:39:05 UTC 2024 (40e256a) x86_64
 Python: 3.12.3 (main, Apr 10 2024, 05:33:47) [GCC 13.2.0]
Host: Linux-5.14.21-150500.55.68-default-x86_64-with-glibc2.39 (Linux 22a657516d60 5.14.21-150500.55.68-default #1 SMP PREEMPT_DYNAMIC Wed Jun 5 21:39:05 UTC 2024 (40e256a) x86_64 x86_64)
 SIS - SPARC/RISCV instruction simulator 2.30,  copyright Jiri Gaisler 2020
 Bug-reports to jiri at gaisler.se
 LEON3 emulation enabled, 4 cpus online, delta 50 clocks
 Loaded hello_rtems_sparc.exe, entry 0x40000000
Hello from Rust
cpu 0 in error mode (tt = 0x80)
   218950  40019060:  91d02000   ta  0x0
Run time     : 0:00:00.255040
```

The first known buggy build was:

| | Version/Commmit |
| ------ | ------ |
|Date: |2024-08-01T02:33:11+02:00 |
|rtems-docs: |05f9a3d56b45e700104d22bf40881ef89fff5d91 |
|rtems-source-builder: |892e966e4331f977cca8c83fc3bc22c8fa9d2754 |
|rtems: |30ae3ef9dae36d6bfce650567af55000ca018650 |
|cargo: |1.80.0 (376290515 2024-07-16) |

The last known good build was:

| | Version/Commmit |
| ------ | ------ |
|Date: |2024-07-29T02:33:15+02:00 |
|rtems-docs: |05f9a3d56b45e700104d22bf40881ef89fff5d91|
|rtems-source-builder: |892e966e4331 |
|rtems: |807070a696a93c1dae09f527efd2a516b01d7277 |
|cargo: |1.80.0 (376290515 2024-07-16) |

The *rtems, rtems-source-builder, rtems-docs* git commits seem to not affect the outcome. Hence, I assume something has changed in Rust. Since the build for SPARC still uses Rust "nightly", its worth a try whether the "nightly" is still needed.

The build of hello world for Risc V (which is also part of the rtems user manual instructions) is not affected and works fine.

## Steps to reproduce

Follow the instructions in [Bare Metal Rust with RTEMS](https://docs.rtems.org/branches/master/user/rust/bare-metal.html#bare-metal-rust-with-rtems)

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/issues/32
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