50 lines
1.4 KiB
Rust
50 lines
1.4 KiB
Rust
use rustc_middle::mir;
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use crate::*;
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#[derive(Debug, Copy, Clone)]
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pub enum Dlsym {
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GetEntropy,
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}
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impl Dlsym {
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// Returns an error for unsupported symbols, and None if this symbol
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// should become a NULL pointer (pretend it does not exist).
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pub fn from_str(name: &str) -> InterpResult<'static, Option<Dlsym>> {
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use self::Dlsym::*;
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Ok(match name {
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"getentropy" => Some(GetEntropy),
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"__pthread_get_minstack" => None,
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_ => throw_unsup_format!("unsupported dlsym: {}", name),
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})
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}
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}
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impl<'mir, 'tcx> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
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pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
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fn call_dlsym(
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&mut self,
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dlsym: Dlsym,
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args: &[OpTy<'tcx, Tag>],
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ret: Option<(PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
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) -> InterpResult<'tcx> {
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use self::Dlsym::*;
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let this = self.eval_context_mut();
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let (dest, ret) = ret.expect("we don't support any diverging dlsym");
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match dlsym {
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GetEntropy => {
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let ptr = this.read_scalar(args[0])?.not_undef()?;
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let len = this.read_scalar(args[1])?.to_machine_usize(this)?;
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this.gen_random(ptr, len)?;
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this.write_null(dest)?;
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}
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}
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this.dump_place(*dest);
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this.go_to_block(ret);
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Ok(())
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}
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}
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