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FEXInterpreter is now FEX, update your phonebooks #239

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Merged
slp merged 1 commit into from
Jul 15, 2026
+9 −10
Merged

FEXInterpreter is now FEX, update your phonebooks #239

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19 changes: 9 additions & 10 deletions crates/muvm/src/guest/fex.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,34 +8,33 @@ use crate::utils::env::find_in_path;
const FEX_X86_BINFMT_MISC_RULE: &str = ":FEX-x86:M:0:\\x7fELF\\x01\\x01\\x01\\x00\\x00\\x00\\x00\\\
x00\\x00\\x00\\x00\\x00\\x02\\x00\\x03\\x00:\\xff\\xff\\\
xff\\xff\\xff\\xfe\\xfe\\x00\\x00\\x00\\x00\\xff\\xff\\\
xff\\xff\\xff\\xfe\\xff\\xff\\xff:${FEX_INTERPRETER}:POCF";
xff\\xff\\xff\\xfe\\xff\\xff\\xff:${FEX}:POCF";
const FEX_X86_64_BINFMT_MISC_RULE: &str =
":FEX-x86_64:M:0:\\x7fELF\\x02\\x01\\x01\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x02\\\
x00\\x3e\\x00:\\xff\\xff\\xff\\xff\\xff\\xfe\\xfe\\x00\\x00\\x00\\x00\\xff\\xff\\xff\\xff\\\
xff\\xfe\\xff\\xff\\xff:${FEX_INTERPRETER}:POCF";
xff\\xfe\\xff\\xff\\xff:${FEX}:POCF";

pub fn setup_fex() -> Result<()> {
let fex_interpreter_path =
find_in_path("FEXInterpreter").context("Failed to check existence of `FEXInterpreter`")?;
let Some(fex_interpreter_path) = fex_interpreter_path else {
return Err(anyhow!("Failed to find `FEXInterpreter` in PATH"));
let fex_path = find_in_path("FEX").context("Failed to check existence of `FEX`")?;
let Some(fex_path) = fex_path else {
return Err(anyhow!("Failed to find `FEX` in PATH"));
};
let fex_interpreter_path = fex_interpreter_path
let fex_path = fex_path
.to_str()
.context("Failed to process `FEXInterpreter` path as it contains invalid UTF-8")?;
.context("Failed to process `FEX` path as it contains invalid UTF-8")?;

let mut file = File::options()
.write(true)
.open("/proc/sys/fs/binfmt_misc/register")
.context("Failed to open binfmt_misc/register for writing")?;

{
let rule = FEX_X86_BINFMT_MISC_RULE.replace("${FEX_INTERPRETER}", fex_interpreter_path);
let rule = FEX_X86_BINFMT_MISC_RULE.replace("${FEX}", fex_path);
file.write_all(rule.as_bytes())
.context("Failed to register `FEX-x86` binfmt_misc rule")?;
}
{
let rule = FEX_X86_64_BINFMT_MISC_RULE.replace("${FEX_INTERPRETER}", fex_interpreter_path);
let rule = FEX_X86_64_BINFMT_MISC_RULE.replace("${FEX}", fex_path);
file.write_all(rule.as_bytes())
.context("Failed to register `FEX-x86_64` binfmt_misc rule")?;
}
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