diff options
Diffstat (limited to 'src/tools/miri/src/shims/foreign_items.rs')
| -rw-r--r-- | src/tools/miri/src/shims/foreign_items.rs | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/src/tools/miri/src/shims/foreign_items.rs b/src/tools/miri/src/shims/foreign_items.rs index fcee381ff71..44bca3796f9 100644 --- a/src/tools/miri/src/shims/foreign_items.rs +++ b/src/tools/miri/src/shims/foreign_items.rs @@ -46,7 +46,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> { // This list should be kept in sync with the one from libstd. let min_align = match this.tcx.sess.target.arch.as_ref() { "x86" | "arm" | "mips" | "powerpc" | "powerpc64" | "asmjs" | "wasm32" => 8, - "x86_64" | "aarch64" | "mips64" | "s390x" | "sparc64" => 16, + "x86_64" | "aarch64" | "mips64" | "s390x" | "sparc64" | "loongarch64" => 16, arch => bug!("unsupported target architecture for malloc: `{}`", arch), }; // Windows always aligns, even small allocations. @@ -744,6 +744,44 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> { dest, )?; } + "memcpy" => { + let [ptr_dest, ptr_src, n] = + this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; + let ptr_dest = this.read_pointer(ptr_dest)?; + let ptr_src = this.read_pointer(ptr_src)?; + let n = this.read_target_usize(n)?; + this.mem_copy( + ptr_src, + Align::ONE, + ptr_dest, + Align::ONE, + Size::from_bytes(n), + true, + )?; + this.write_pointer(ptr_dest, dest)?; + } + "strcpy" => { + let [ptr_dest, ptr_src] = + this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; + let ptr_dest = this.read_pointer(ptr_dest)?; + let ptr_src = this.read_pointer(ptr_src)?; + + // We use `read_c_str` to determine the amount of data to copy, + // and then use `mem_copy` for the actual copy. This means + // pointer provenance is preserved by this implementation of `strcpy`. + // That is probably overly cautious, but there also is no fundamental + // reason to have `strcpy` destroy pointer provenance. + let n = this.read_c_str(ptr_src)?.len().checked_add(1).unwrap(); + this.mem_copy( + ptr_src, + Align::ONE, + ptr_dest, + Align::ONE, + Size::from_bytes(n), + true, + )?; + this.write_pointer(ptr_dest, dest)?; + } // math functions (note that there are also intrinsics for some other functions) #[rustfmt::skip] |