diff --git a/src/doc/book b/src/doc/book
index db919bc6bb907..9cffbeabec3bc 160000
--- a/src/doc/book
+++ b/src/doc/book
@@ -1 +1 @@
-Subproject commit db919bc6bb9071566e9c4f05053672133eaac33e
+Subproject commit 9cffbeabec3bcec42d09432bfe7705125c848889
diff --git a/src/doc/edition-guide b/src/doc/edition-guide
index c413d42a207bd..aa0022c875907 160000
--- a/src/doc/edition-guide
+++ b/src/doc/edition-guide
@@ -1 +1 @@
-Subproject commit c413d42a207bd082f801ec0137c31b71e4bfed4c
+Subproject commit aa0022c875907886cae8f3ef8e9ebf6e2a5e728d
diff --git a/src/doc/embedded-book b/src/doc/embedded-book
index de3d55f521e65..9e656ead82bfe 160000
--- a/src/doc/embedded-book
+++ b/src/doc/embedded-book
@@ -1 +1 @@
-Subproject commit de3d55f521e657863df45260ebbca1b10527f662
+Subproject commit 9e656ead82bfe869493dec82653a52e27fa6a05c
diff --git a/src/doc/nomicon b/src/doc/nomicon
index fb29b147be4d9..f1ff93b668444 160000
--- a/src/doc/nomicon
+++ b/src/doc/nomicon
@@ -1 +1 @@
-Subproject commit fb29b147be4d9a1f8e24aba753a7e1de537abf61
+Subproject commit f1ff93b66844493a7b03101c7df66ac958c62418
diff --git a/src/doc/reference b/src/doc/reference
index 2a2de9ce09597..41493ffce5d0e 160000
--- a/src/doc/reference
+++ b/src/doc/reference
@@ -1 +1 @@
-Subproject commit 2a2de9ce095979978ad7b582daecf94e4070b916
+Subproject commit 41493ffce5d0e17d54eaf5ec9a995054e2b9aece
diff --git a/src/doc/rust-by-example b/src/doc/rust-by-example
index 1ff0f8e018838..2ce92beabb912 160000
--- a/src/doc/rust-by-example
+++ b/src/doc/rust-by-example
@@ -1 +1 @@
-Subproject commit 1ff0f8e018838a710ebc0cc1a7bf74ebe73ad9f1
+Subproject commit 2ce92beabb912d417a7314d6da83ac9b50dc2afb
diff --git a/src/doc/rustc-guide b/src/doc/rustc-guide
index 99e1b1d53656b..344c4e437ba4c 160000
--- a/src/doc/rustc-guide
+++ b/src/doc/rustc-guide
@@ -1 +1 @@
-Subproject commit 99e1b1d53656be08654df399fc200584aebb50e4
+Subproject commit 344c4e437ba4cfa5c14db643ec4d6b68dcd164c5
diff --git a/src/libcore/intrinsics.rs b/src/libcore/intrinsics.rs
index 782a7ba455984..bd7570d0f68f4 100644
--- a/src/libcore/intrinsics.rs
+++ b/src/libcore/intrinsics.rs
@@ -41,6 +41,8 @@
                    since = "1.18.0")]
 pub use crate::ptr::drop_in_place;
 
+use crate::mem;
+
 extern "rust-intrinsic" {
     // N.B., these intrinsics take raw pointers because they mutate aliased
     // memory, which is not valid for either `&` or `&mut`.
@@ -1323,6 +1325,26 @@ mod real_intrinsics {
   }
 }
 
+/// Checks whether `ptr` is properly aligned with respect to
+/// `align_of::<T>()`.
+pub(crate) fn is_aligned_and_not_null<T>(ptr: *const T) -> bool {
+    return !ptr.is_null() && ptr as usize % mem::align_of::<T>() == 0;
+}
+
+/// Checks whether the regions of memory starting at `src` and `dst` of size
+/// `count * size_of::<T>()` overlap.
+fn overlaps<T>(src: *const T, dst: *const T, count: usize) -> bool {
+    let src_usize = src as usize;
+    let dst_usize = dst as usize;
+    let size = mem::size_of::<T>().checked_mul(count).unwrap();
+    let diff = if src_usize > dst_usize {
+        src_usize - dst_usize
+    } else {
+        dst_usize - src_usize
+    };
+    size > diff
+}
+
 /// Copies `count * size_of::<T>()` bytes from `src` to `dst`. The source
 /// and destination must *not* overlap.
 ///
@@ -1409,6 +1431,9 @@ mod real_intrinsics {
 #[stable(feature = "rust1", since = "1.0.0")]
 #[inline]
 pub unsafe fn copy_nonoverlapping<T>(src: *const T, dst: *mut T, count: usize) {
+    debug_assert!(is_aligned_and_not_null(src), "attempt to copy from unaligned or null pointer");
+    debug_assert!(is_aligned_and_not_null(dst), "attempt to copy to unaligned or null pointer");
+    debug_assert!(!overlaps(src, dst, count), "attempt to copy to overlapping memory");
     real_intrinsics::copy_nonoverlapping(src, dst, count);
 }
 
@@ -1466,6 +1491,8 @@ pub unsafe fn copy_nonoverlapping<T>(src: *const T, dst: *mut T, count: usize) {
 #[stable(feature = "rust1", since = "1.0.0")]
 #[inline]
 pub unsafe fn copy<T>(src: *const T, dst: *mut T, count: usize) {
+    debug_assert!(is_aligned_and_not_null(src), "attempt to copy from unaligned or null pointer");
+    debug_assert!(is_aligned_and_not_null(dst), "attempt to copy to unaligned or null pointer");
     real_intrinsics::copy(src, dst, count)
 }
 
@@ -1544,5 +1571,6 @@ pub unsafe fn copy<T>(src: *const T, dst: *mut T, count: usize) {
 #[stable(feature = "rust1", since = "1.0.0")]
 #[inline]
 pub unsafe fn write_bytes<T>(dst: *mut T, val: u8, count: usize) {
+    debug_assert!(is_aligned_and_not_null(dst), "attempt to write to unaligned or null pointer");
     real_intrinsics::write_bytes(dst, val, count)
 }
diff --git a/src/libcore/slice/mod.rs b/src/libcore/slice/mod.rs
index 8731f48675356..593ca4d8160b6 100644
--- a/src/libcore/slice/mod.rs
+++ b/src/libcore/slice/mod.rs
@@ -26,6 +26,7 @@ use crate::cmp::Ordering::{self, Less, Equal, Greater};
 use crate::cmp;
 use crate::fmt;
 use crate::intrinsics::assume;
+use crate::intrinsics::is_aligned_and_not_null;
 use crate::isize;
 use crate::iter::*;
 use crate::ops::{FnMut, Try, self};
@@ -5084,7 +5085,7 @@ unsafe impl<'a, T> TrustedRandomAccess for RChunksExactMut<'a, T> {
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub unsafe fn from_raw_parts<'a, T>(data: *const T, len: usize) -> &'a [T] {
-    debug_assert!(data as usize % mem::align_of::<T>() == 0, "attempt to create unaligned slice");
+    debug_assert!(is_aligned_and_not_null(data), "attempt to create unaligned or null slice");
     debug_assert!(mem::size_of::<T>().saturating_mul(len) <= isize::MAX as usize,
                   "attempt to create slice covering half the address space");
     Repr { raw: FatPtr { data, len } }.rust
@@ -5105,7 +5106,7 @@ pub unsafe fn from_raw_parts<'a, T>(data: *const T, len: usize) -> &'a [T] {
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub unsafe fn from_raw_parts_mut<'a, T>(data: *mut T, len: usize) -> &'a mut [T] {
-    debug_assert!(data as usize % mem::align_of::<T>() == 0, "attempt to create unaligned slice");
+    debug_assert!(is_aligned_and_not_null(data), "attempt to create unaligned or null slice");
     debug_assert!(mem::size_of::<T>().saturating_mul(len) <= isize::MAX as usize,
                   "attempt to create slice covering half the address space");
     Repr { raw: FatPtr { data, len } }.rust_mut
diff --git a/src/librustc_codegen_llvm/llvm/ffi.rs b/src/librustc_codegen_llvm/llvm/ffi.rs
index f88923fc9f1c5..01fe1afd51e2c 100644
--- a/src/librustc_codegen_llvm/llvm/ffi.rs
+++ b/src/librustc_codegen_llvm/llvm/ffi.rs
@@ -1706,7 +1706,9 @@ extern "C" {
     pub fn LLVMRustArchiveIteratorFree(AIR: &'a mut ArchiveIterator<'a>);
     pub fn LLVMRustDestroyArchive(AR: &'static mut Archive);
 
-    pub fn LLVMRustGetSectionName(SI: &SectionIterator<'_>, data: &mut *const c_char) -> size_t;
+    #[allow(improper_ctypes)]
+    pub fn LLVMRustGetSectionName(SI: &SectionIterator<'_>,
+                                  data: &mut Option<std::ptr::NonNull<c_char>>) -> size_t;
 
     #[allow(improper_ctypes)]
     pub fn LLVMRustWriteTwineToString(T: &Twine, s: &RustString);
diff --git a/src/librustc_codegen_llvm/metadata.rs b/src/librustc_codegen_llvm/metadata.rs
index 7cf497cb5d036..9bddd29d2e88f 100644
--- a/src/librustc_codegen_llvm/metadata.rs
+++ b/src/librustc_codegen_llvm/metadata.rs
@@ -8,7 +8,6 @@ use rustc_data_structures::owning_ref::OwningRef;
 use rustc_codegen_ssa::METADATA_FILENAME;
 
 use std::path::Path;
-use std::ptr;
 use std::slice;
 use rustc_fs_util::path_to_c_string;
 
@@ -67,10 +66,14 @@ fn search_meta_section<'a>(of: &'a ObjectFile,
     unsafe {
         let si = mk_section_iter(of.llof);
         while llvm::LLVMIsSectionIteratorAtEnd(of.llof, si.llsi) == False {
-            let mut name_buf = ptr::null();
+            let mut name_buf = None;
             let name_len = llvm::LLVMRustGetSectionName(si.llsi, &mut name_buf);
-            let name = slice::from_raw_parts(name_buf as *const u8, name_len as usize).to_vec();
-            let name = String::from_utf8(name).unwrap();
+            let name = name_buf.map_or(
+                "".to_string(),
+                |buf| String::from_utf8(
+                    slice::from_raw_parts(buf.as_ptr() as *const u8,
+                                          name_len as usize)
+                    .to_vec()).unwrap());
             debug!("get_metadata_section: name {}", name);
             if read_metadata_section_name(target) == name {
                 let cbuf = llvm::LLVMGetSectionContents(si.llsi);
diff --git a/src/llvm-project b/src/llvm-project
index 84abffda0e03b..4fc9fb8245abe 160000
--- a/src/llvm-project
+++ b/src/llvm-project
@@ -1 +1 @@
-Subproject commit 84abffda0e03b03c62bdfc3cfeda1c2cf1f88c85
+Subproject commit 4fc9fb8245abe24680192535870c4522644a4212
diff --git a/src/stdsimd b/src/stdsimd
index 4bf456c35e85f..359845eb7cae8 160000
--- a/src/stdsimd
+++ b/src/stdsimd
@@ -1 +1 @@
-Subproject commit 4bf456c35e85fcca5cf95008401af8ab25abf850
+Subproject commit 359845eb7cae85799dc2ec81f2fb05da0aa6276d
diff --git a/src/tools/cargo b/src/tools/cargo
index 6be12653dcefb..0e35bd8af0ec7 160000
--- a/src/tools/cargo
+++ b/src/tools/cargo
@@ -1 +1 @@
-Subproject commit 6be12653dcefb46ee7b605f063ee75b5e6cba513
+Subproject commit 0e35bd8af0ec72d3225c4819b330b94628f0e9d0
diff --git a/src/tools/clippy b/src/tools/clippy
index 8c0e038f6f25e..016d92d6ed5ae 160000
--- a/src/tools/clippy
+++ b/src/tools/clippy
@@ -1 +1 @@
-Subproject commit 8c0e038f6f25e0d8db8e24bcd37b4b11ca9665c6
+Subproject commit 016d92d6ed5ae8a3785b65aa300768abbc26f818
diff --git a/src/tools/miri b/src/tools/miri
index 7d7cf4d42e414..72b4ee0381dec 160000
--- a/src/tools/miri
+++ b/src/tools/miri
@@ -1 +1 @@
-Subproject commit 7d7cf4d42e41437f5a5b04a6b8dd567f330ae6ee
+Subproject commit 72b4ee0381decf609204e5548c1f5e79bdfb18b7
diff --git a/src/tools/rls b/src/tools/rls
index 20e32686df573..6840dd69af3ad 160000
--- a/src/tools/rls
+++ b/src/tools/rls
@@ -1 +1 @@
-Subproject commit 20e32686df573fc44ac1052bf3e6982b0da27cfc
+Subproject commit 6840dd69af3ada1f8a432075f1f0be679ea8a468
diff --git a/src/tools/rustfmt b/src/tools/rustfmt
index b860feaffccb8..d6829d62dca64 160000
--- a/src/tools/rustfmt
+++ b/src/tools/rustfmt
@@ -1 +1 @@
-Subproject commit b860feaffccb81199c045e9b1511c2e25825dc0c
+Subproject commit d6829d62dca64dfe7ceaa96d1a9c1cd36428221d