v1.20.0

Raven v1.20.0

riscv32im-unknown-none-elf Compatibility

Raven runs ELF binaries compiled for the riscv32im-unknown-none-elf target — the standard bare-metal Rust target for 32-bit RISC-V without an operating system.

To compile a project for Raven:

# .cargo/config.toml
[build]
target = "riscv32im-unknown-none-elf"

cargo build --release
# load the generated .elf in Raven via Ctrl+O

A working, commented example is available at docs/RustCompatibleABI.rs, showing the minimal structure of a #![no_std] program with _start, a panic handler, and communication with the emulator.

Note: communication with the emulator uses the Linux RISC-V syscall ABI (ecall). No external crates are needed — just core::arch::asm!. The example in docs/RustCompatibleABI.rs wraps this into simple helper functions to keep application code clean.

Supported Extensions

Extension	Support
RV32I — base integer	✅
RV32M — multiply/divide	✅
RV32A — atomics	✅
RV32F — single-precision float	✅
fence	✅ (no-op on single-core)

Available Syscalls

Raven implements a subset of the Linux RISC-V syscall ABI. You don't need to call ecall directly — the example in docs/RustCompatibleABI.rs provides ready-to-use wrappers.

Syscall	Purpose
write (64)	Write text to the Raven console
read (63)	Read a line typed by the user
exit (93)	Terminate execution
getrandom (278)	Fill a buffer with random bytes

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What's new in v1.20.0 — Visible exit code

When a program calls exit, Raven now prints the exit code in red in the console:

Exit 0

Makes it easy to tell at a glance whether the program finished successfully or with an error, without having to inspect registers manually.

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Download

Platform	File
Windows x64	raven-x86_64-pc-windows-msvc.zip
Linux x64	raven-x86_64-unknown-linux-gnu.tar.gz
macOS x64	raven-x86_64-apple-darwin.tar.gz
macOS ARM64 (Apple Silicon)	raven-aarch64-apple-darwin.tar.gz

SHA256 checksums for all files in SHA256SUMS.txt.