src/shims/foreign_items/posix/linux.rs

   1 use crate::*;
   2 use rustc::mir;
   3
   4 impl<'mir, 'tcx> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
   5 pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
   6     fn emulate_foreign_item_by_name(
   7         &mut self,
   8         link_name: &str,
   9         args: &[OpTy<'tcx, Tag>],
  10         dest: PlaceTy<'tcx, Tag>,
  11         _ret: mir::BasicBlock,
  12     ) -> InterpResult<'tcx, bool> {
  13         let this = self.eval_context_mut();
  14
  15         match link_name {
  16             "__errno_location" => {
  17                 let errno_place = this.machine.last_error.unwrap();
  18                 this.write_scalar(errno_place.to_ref().to_scalar()?, dest)?;
  19             }
  20
  21             // File related shims
  22             "open64" => {
  23                 let result = this.open(args[0], args[1])?;
  24                 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
  25             }
  26
  27             "close" => {
  28                 let result = this.close(args[0])?;
  29                 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
  30             }
  31
  32             "lseek64" => {
  33                 let result = this.lseek64(args[0], args[1], args[2])?;
  34                 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
  35             }
  36
  37             // Time related shims
  38             "clock_gettime" => {
  39                 let result = this.clock_gettime(args[0], args[1])?;
  40                 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
  41             }
  42
  43             // Other shims
  44             "pthread_getattr_np" => {
  45                 this.write_null(dest)?;
  46             }
  47
  48             "syscall" => {
  49                 let sys_getrandom = this
  50                     .eval_path_scalar(&["libc", "SYS_getrandom"])?
  51                     .expect("Failed to get libc::SYS_getrandom")
  52                     .to_machine_usize(this)?;
  53
  54                 let sys_statx = this
  55                     .eval_path_scalar(&["libc", "SYS_statx"])?
  56                     .expect("Failed to get libc::SYS_statx")
  57                     .to_machine_usize(this)?;
  58
  59                 match this.read_scalar(args[0])?.to_machine_usize(this)? {
  60                     // `libc::syscall(NR_GETRANDOM, buf.as_mut_ptr(), buf.len(), GRND_NONBLOCK)`
  61                     // is called if a `HashMap` is created the regular way (e.g. HashMap<K, V>).
  62                     id if id == sys_getrandom => {
  63                         // The first argument is the syscall id,
  64                         // so skip over it.
  65                         super::getrandom(this, &args[1..], dest)?;
  66                     }
  67                     id if id == sys_statx => {
  68                         // The first argument is the syscall id,
  69                         // so skip over it.
  70                         let result = this.statx(args[1], args[2], args[3], args[4], args[5])?;
  71                         this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
  72                     }
  73                     id => throw_unsup_format!("miri does not support syscall ID {}", id),
  74                 }
  75             }
  76
  77             "getrandom" => {
  78                 super::getrandom(this, args, dest)?;
  79             }
  80
  81             "sched_getaffinity" => {
  82                 // Return an error; `num_cpus` then falls back to `sysconf`.
  83                 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
  84             }
  85
  86             _ => throw_unsup_format!("can't call foreign function: {}", link_name),
  87         };
  88
  89         Ok(true)
  90     }
  91 }