RTEMS | RISC-V: hello.exe crashes since 2024-Oct-26 (#5139)

[Frank Kuehndel (@frank_k)]

Frank Kuehndel created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5139



## Summary

We have a CI job which executs the exact instructions from the [rtems user manual: Bare Metal Rust with RTEMS](https://docs.rtems.org/branches/master/user/rust/bare-metal.html#bare-metal-rust-with-rtems) and therefore runs `hello.exe` from the RTEMS samples. This executable crashes when executed. The Ticker sample crashes too.

This is **not** a Rust bug! This is just RTEMS without any Rust involved!

Basically, it does:

1. Run RSB for Risc-V to install Tools.
2. Build for Risc-V
3. Run the `hello.exe` sample

The output looks like:

```
+ qemu-system-riscv64 -M virt -nographic -bios build/riscv/rv64imafdc/testsuites/samples/hello.exe

*** FATAL ***
fatal source: 9 (RTEMS_FATAL_SOURCE_EXCEPTION)
mstatus 0x8000000a00007800
mcause  0x0000000000000007
mepc    0x0000000080005d66
ra      0x0000000080005d36
sp      0x0000000080057a40
gp      0x0000000080053800
tp      0x0000000000000000
t0      0x000000008000b56e
t1      0x000000000000000f
t2      0x0000000000000000
s0      0x000000008005c470
s1      0x0000000000000010
a0      0x0000000080055010
a1      0x0000000000000000
a2      0xffffff788005c480
a3      0x00000000800550b0
a4      0x0000000100000000
a5      0x0000000000000000
a6      0x0000000000000000
a7      0x0000000000000008
s2      0x000000877ffa3b80
s3      0x0000000000000011
s4      0x00000087fffffff0
s5      0x0000000000000020
s6      0x000000877ffa3b91
s7      0x0000008800000000
s8      0x000000008005c46f
s9      0x0000000000000000
s10     0x0000000000000000
s11     0x0000000000000000
t3      0x00000000000000f6
t4      0x0000000000000000
t5      0x0000000000000000
t6      0x0000000000000000
fcsr    0x00000000
RTEMS version: 6.0.0.eaaeebedda43a9e9886078389b3af05d0c267a7a
RTEMS tools: 13.3.0 20240521 (RTEMS 6, RSB 78680c889c2458f26170fe6e4a05c37791aacc87, Newlib 1b3dcfd)
executing thread is NULL
```

The first known buggy build was:

| | Version/Commmit |
| ------ | ------ |
|Date: |2024-10-26T02:33:07+02:00 |
|rtems-docs: |a3cfaea265cb6b5af8f0eb6cb5f4ace32873ecf3 |
|rtems-source-builder: |78680c889c2458f26170fe6e4a05c37791aacc87 |
|rtems: |eaaeebedda43a9e9886078389b3af05d0c267a7a |

The last known good build was:

| | Version/Commmit |
| ------ | ------ |
|Date: |2024-10-25T02:33:14+02:00 |
|rtems-docs: |2cafea3f43db17f7f0355078449acd77527e2dd3 |
|rtems-source-builder: |d7870131e4de88f35ed137e62c83874597ccee82 |
|rtems: |e0f1c8fe0b20ae486f5b99c3a9155686bc3a11f2 |

By the way, the build of `hello.exe` for SPARC (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)

### Pre-set options

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5139
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