NationalSecurityAgency/ghidra · warning · RuntimeException

Unsupported language.

Error message

Unsupported language.

What it means

Thrown by FindUndefinedFunctionsScript.getPatterns when the current program's processor is not x86 (windows/gcc), PowerPC, or ARM. The script only knows compiler function-prologue byte patterns for those architectures; anything else (MIPS, AARCH64, RISC-V, etc.) falls through all the if-blocks and hits RuntimeException.

Source

Thrown at Ghidra/Features/Base/ghidra_scripts/FindUndefinedFunctionsScript.java:125

				(byte) 0x02, (byte) 0xa6 }, false),//
			};
		}
		if (processor.equals(Processor.findOrPossiblyCreateProcessor("ARM"))) {
			return new PatternMatcher[] {
				//new PatternMatcher(new byte[]{(byte)0x00,(byte)0x00,(byte)0x50,(byte)0xe3}, true),//only check 'cmp' at function entry
				//new PatternMatcher(new byte[]{(byte)0x00,(byte)0x00,(byte)0x51,(byte)0xe3}, true),//only check 'cmp' at function entry
				//new PatternMatcher(new byte[]{(byte)0x00,(byte)0x00,(byte)0x53,(byte)0xe3}, true),//only check 'cmp' at function entry
				new PatternMatcher(
					new byte[] { (byte) 0xf0, (byte) 0x40, (byte) 0x2d, (byte) 0xe9 }, false),//stmdb sp!{r4 r5 r6 r7 lr}
				new PatternMatcher(
					new byte[] { (byte) 0xb0, (byte) 0x40, (byte) 0x2d, (byte) 0xe9 }, false),//stmdb sp!{r4 r5 r7 lr}
				new PatternMatcher(
					new byte[] { (byte) 0x90, (byte) 0x40, (byte) 0x2d, (byte) 0xe9 }, false),//stmdb sp!{r4 r7 lr}
				new PatternMatcher(
					new byte[] { (byte) 0x80, (byte) 0x40, (byte) 0x2d, (byte) 0xe9 }, false),//stmdb sp!{r7 lr}
			};
		}
		throw new RuntimeException("Unsupported language.");
	}

	private class PatternMatcher {
		byte[] expectedBytes;
		boolean requiresEntyPoint;

		PatternMatcher(byte[] expectedBytes, boolean requiresEntryPoint) {
			this.expectedBytes = expectedBytes;
			this.requiresEntyPoint = requiresEntryPoint;
		}

		boolean isMatch(Address undefinedAddress) throws MemoryAccessException {
			byte[] actualBytes = new byte[expectedBytes.length];
			currentProgram.getMemory().getBytes(undefinedAddress, actualBytes);

			if (equals(expectedBytes, actualBytes)) {
				if (requiresEntyPoint) {
//					return currentProgram.getSymbolTable().isExternalEntryPoint(undefinedAddress);

View on GitHub (pinned to d5f144c24d)

Solutions

1. Confirm the program's processor is x86/PowerPC/ARM; for others, this script will not help.
2. Extend getPatterns with byte signatures for the new architecture and rebuild the script.
3. Skip the script for unsupported languages: check currentProgram.getLanguage().getProcessor() first and exit cleanly.
4. Use Ghidra's auto-analysis 'Subroutine References' or 'Function Recovery' for architectures this script doesn't cover.

Example fix

// before
// falls through x86/PowerPC/ARM checks
throw new RuntimeException("Unsupported language.");

// after
Processor p = currentProgram.getLanguage().getProcessor();
if (!p.equals(Processor.findOrPossiblyCreateProcessor("x86")) &&
    !p.equals(Processor.findOrPossiblyCreateProcessor("PowerPC")) &&
    !p.equals(Processor.findOrPossiblyCreateProcessor("ARM"))) {
    println("Unsupported processor: " + p + " - nothing to do.");
    return new PatternMatcher[0];
}

Processor p = currentProgram.getLanguage().getProcessor();
boolean supported =
    p.equals(Processor.findOrPossiblyCreateProcessor("x86")) ||
    p.equals(Processor.findOrPossiblyCreateProcessor("PowerPC")) ||
    p.equals(Processor.findOrPossiblyCreateProcessor("ARM"));
if (!supported) {
    // do not run getPatterns / the script
}

static boolean isSupportedProcessor(Program prog) {
    Processor p = prog.getLanguage().getProcessor();
    return p.equals(Processor.findOrPossiblyCreateProcessor("x86")) ||
           p.equals(Processor.findOrPossiblyCreateProcessor("PowerPC")) ||
           p.equals(Processor.findOrPossiblyCreateProcessor("ARM"));
}

try {
    run();
} catch (RuntimeException e) {
    if ("Unsupported language.".equals(e.getMessage())) {
        println("Processor not supported by this script.");
    } else throw e;
}

When it happens

Trigger: Running FindUndefinedFunctionsScript against a program whose language processor is not in the supported set. The method iterates known prologue signatures and throws if none matched.

Common situations: Loading a MIPS, AARCH64, RISC-V, or other unsupported binary. Using a custom Sleigh language whose Processor name doesn't match 'x86'/'PowerPC'/'ARM'.

Related errors

• This mapper cannot handle Harvard guests
• No such register: {name}
• Cannot commit self-score with the matrix scorer
• At file '{pdbName}': {errorMessage}
• headless use not supported

AI-assisted analysis of NationalSecurityAgency/ghidra@d5f144c24d (2026-08-14). Data as JSON: /api/errors/2343c98e55b18fbd. Report an issue: GitHub.