diff --git a/libc-test/semver/freebsd-x86_64.txt b/libc-test/semver/freebsd-x86_64.txt
index be73d1f7290fe..14ddc25a1b254 100644
--- a/libc-test/semver/freebsd-x86_64.txt
+++ b/libc-test/semver/freebsd-x86_64.txt
@@ -13,8 +13,6 @@ _MC_HASSEGS
 fpreg
 fpreg32
 max_align_t
-mcontext_t
 reg
 reg32
-ucontext_t
 xmmreg
diff --git a/libc-test/semver/freebsd.txt b/libc-test/semver/freebsd.txt
index c9944d1d791f7..e3418ef7d220e 100644
--- a/libc-test/semver/freebsd.txt
+++ b/libc-test/semver/freebsd.txt
@@ -2028,6 +2028,7 @@ mallctl
 mallctlbymib
 mallctlnametomib
 mallocx
+mcontext_t
 memmem
 memrchr
 memset_s
@@ -2358,6 +2359,7 @@ timer_t
 timex
 truncate
 ttyname_r
+ucontext_t
 unmount
 useconds_t
 uselocale
diff --git a/src/unix/bsd/freebsdlike/dragonfly/mod.rs b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
index 9b3b872d03948..7bff483df6ae5 100644
--- a/src/unix/bsd/freebsdlike/dragonfly/mod.rs
+++ b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
@@ -1462,6 +1462,7 @@ pub const TIOCISPTMASTER: ::c_ulong = 0x20007455;
 pub const TIOCMODG: ::c_ulong = 0x40047403;
 pub const TIOCMODS: ::c_ulong = 0x80047404;
 pub const TIOCREMOTE: ::c_ulong = 0x80047469;
+pub const TIOCTIMESTAMP: ::c_ulong = 0x40107459;
 
 // Constants used by "at" family of system calls.
 pub const AT_FDCWD: ::c_int = 0xFFFAFDCD; // invalid file descriptor
diff --git a/src/unix/bsd/freebsdlike/freebsd/aarch64.rs b/src/unix/bsd/freebsdlike/freebsd/aarch64.rs
index e8be8815c028e..004b6266ea863 100644
--- a/src/unix/bsd/freebsdlike/freebsd/aarch64.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/aarch64.rs
@@ -1,6 +1,7 @@
 pub type c_char = u8;
 pub type c_long = i64;
 pub type c_ulong = u64;
+pub type clock_t = i32;
 pub type wchar_t = u32;
 pub type time_t = i64;
 pub type suseconds_t = i64;
@@ -142,5 +143,8 @@ cfg_if! {
     }
 }
 
+pub const BIOCSRTIMEOUT: ::c_ulong = 0x8010426d;
+pub const BIOCGRTIMEOUT: ::c_ulong = 0x4010426e;
 pub const MAP_32BIT: ::c_int = 0x00080000;
 pub const MINSIGSTKSZ: ::size_t = 4096; // 1024 * 4
+pub const TIOCTIMESTAMP: ::c_ulong = 0x40107459;
diff --git a/src/unix/bsd/freebsdlike/freebsd/arm.rs b/src/unix/bsd/freebsdlike/freebsd/arm.rs
index 8ff500c65981c..c5c79323f727e 100644
--- a/src/unix/bsd/freebsdlike/freebsd/arm.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/arm.rs
@@ -1,10 +1,54 @@
 pub type c_char = u8;
 pub type c_long = i32;
 pub type c_ulong = u32;
+pub type clock_t = u32;
 pub type wchar_t = u32;
 pub type time_t = i64;
 pub type suseconds_t = i32;
 pub type register_t = i32;
+pub type __greg_t = ::c_uint;
+pub type __gregset_t = [::__greg_t; 17];
+
+s_no_extra_traits! {
+    pub struct mcontext_t {
+        pub __gregs: ::__gregset_t,
+        pub mc_vfp_size: ::__size_t,
+        pub mc_vfp_ptr: *mut ::c_void,
+        pub mc_spare: [::c_uint; 33],
+    }
+}
+
+cfg_if! {
+    if #[cfg(feature = "extra_traits")] {
+        impl PartialEq for mcontext_t {
+            fn eq(&self, other: &mcontext_t) -> bool {
+                self.__gregs == other.__gregs &&
+                self.mc_vfp_size == other.mc_vfp_size &&
+                self.mc_vfp_ptr == other.mc_vfp_ptr &&
+                self.mc_spare.iter().zip(other.mc_spare.iter()).all(|(a, b)| a == b)
+            }
+        }
+        impl Eq for mcontext_t {}
+        impl ::fmt::Debug for mcontext_t {
+            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
+                f.debug_struct("mcontext_t")
+                    .field("__gregs", &self.__gregs)
+                    .field("mc_vfp_size", &self.mc_vfp_size)
+                    .field("mc_vfp_ptr", &self.mc_vfp_ptr)
+                    .field("mc_spare", &self.mc_spare)
+                    .finish()
+            }
+        }
+        impl ::hash::Hash for mcontext_t {
+            fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
+                self.__gregs.hash(state);
+                self.mc_vfp_size.hash(state);
+                self.mc_vfp_ptr.hash(state);
+                self.mc_spare.hash(state);
+            }
+        }
+    }
+}
 
 // should be pub(crate), but that requires Rust 1.18.0
 cfg_if! {
@@ -16,5 +60,9 @@ cfg_if! {
         pub const _ALIGNBYTES: usize = 4 - 1;
     }
 }
+
+pub const BIOCSRTIMEOUT: ::c_ulong = 0x8010426d;
+pub const BIOCGRTIMEOUT: ::c_ulong = 0x4010426e;
 pub const MAP_32BIT: ::c_int = 0x00080000;
 pub const MINSIGSTKSZ: ::size_t = 4096; // 1024 * 4
+pub const TIOCTIMESTAMP: ::c_ulong = 0x40107459;
diff --git a/src/unix/bsd/freebsdlike/freebsd/freebsd13/mod.rs b/src/unix/bsd/freebsdlike/freebsd/freebsd13/mod.rs
index 118404e8b089b..e6cc1fad0b591 100644
--- a/src/unix/bsd/freebsdlike/freebsd/freebsd13/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/freebsd13/mod.rs
@@ -41,7 +41,10 @@ s! {
     }
 
     pub struct __c_anonymous_domainset {
-        _priv: [::uintptr_t; 4],
+        #[cfg(target_pointer_width = "64")]
+        _priv: [::c_ulong; 4],
+        #[cfg(target_pointer_width = "32")]
+        _priv: [::c_ulong; 8],
     }
 
     pub struct kinfo_proc {
diff --git a/src/unix/bsd/freebsdlike/freebsd/freebsd14/mod.rs b/src/unix/bsd/freebsdlike/freebsd/freebsd14/mod.rs
index e624dd7201b0a..1c58bb4b5afcf 100644
--- a/src/unix/bsd/freebsdlike/freebsd/freebsd14/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/freebsd14/mod.rs
@@ -41,7 +41,10 @@ s! {
     }
 
     pub struct __c_anonymous_domainset {
-        _priv: [::uintptr_t; 4],
+        #[cfg(target_pointer_width = "64")]
+        _priv: [::c_ulong; 4],
+        #[cfg(target_pointer_width = "32")]
+        _priv: [::c_ulong; 8],
     }
 
     pub struct kinfo_proc {
diff --git a/src/unix/bsd/freebsdlike/freebsd/freebsd15/mod.rs b/src/unix/bsd/freebsdlike/freebsd/freebsd15/mod.rs
index a299af7d5d53e..00ea22a041a7d 100644
--- a/src/unix/bsd/freebsdlike/freebsd/freebsd15/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/freebsd15/mod.rs
@@ -41,7 +41,10 @@ s! {
     }
 
     pub struct __c_anonymous_domainset {
-        _priv: [::uintptr_t; 4],
+        #[cfg(target_pointer_width = "64")]
+        _priv: [::c_ulong; 4],
+        #[cfg(target_pointer_width = "32")]
+        _priv: [::c_ulong; 8],
     }
 
     pub struct kinfo_proc {
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index a15987df10775..56ceabe6aacb8 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -1,5 +1,4 @@
 pub type fflags_t = u32;
-pub type clock_t = i32;
 
 pub type vm_prot_t = u_char;
 pub type kvaddr_t = u64;
@@ -1646,7 +1645,7 @@ s_no_extra_traits! {
         pub kf_flags: ::c_int,
         _kf_pad0: ::c_int,
         pub kf_offset: i64,
-        _priv: [::uintptr_t; 38], // FIXME if needed
+        _priv: [u8; 304],   // FIXME: this is really a giant union
         pub kf_status: u16,
         _kf_pad1: u16,
         _kf_ispare0: ::c_int,
@@ -1654,6 +1653,16 @@ s_no_extra_traits! {
         _kf_cap_spare: u64,
         pub kf_path: [::c_char; ::PATH_MAX as usize],
     }
+
+    pub struct ucontext_t {
+        pub uc_sigmask: ::sigset_t,
+        #[cfg(libc_align)]
+        pub uc_mcontext: ::mcontext_t,
+        pub uc_link: *mut ::ucontext_t,
+        pub uc_stack: ::stack_t,
+        pub uc_flags: ::c_int,
+        __spare__: [::c_int; 4],
+    }
 }
 
 cfg_if! {
@@ -2656,6 +2665,19 @@ cfg_if! {
                 self.kf_path.hash(state);
             }
         }
+
+        impl ::fmt::Debug for ucontext_t {
+            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
+                f.debug_struct("ucontext_t")
+                    .field("uc_sigmask", &self.uc_sigmask)
+                    // FIXME: enable when libc_align is dropped
+                    // .field("uc_mcontext", &self.uc_mcontext)
+                    .field("uc_link", &self.uc_link)
+                    .field("uc_stack", &self.uc_stack)
+                    .field("uc_flags", &self.uc_flags)
+                    .finish()
+            }
+        }
     }
 }
 
@@ -3189,9 +3211,22 @@ pub const H4DISC: ::c_int = 0x7;
 
 pub const VM_TOTAL: ::c_int = 1;
 
-pub const BIOCSETFNR: ::c_ulong = 0x80104282;
+cfg_if! {
+    if #[cfg(target_pointer_width = "64")] {
+        pub const BIOCSETFNR: ::c_ulong = 0x80104282;
+    } else {
+        pub const BIOCSETFNR: ::c_ulong = 0x80084282;
+    }
+}
+
+cfg_if! {
+    if #[cfg(target_pointer_width = "64")] {
+        pub const FIODGNAME: ::c_ulong = 0x80106678;
+    } else {
+        pub const FIODGNAME: ::c_ulong = 0x80086678;
+    }
+}
 
-pub const FIODGNAME: ::c_ulong = 0x80106678;
 pub const FIONWRITE: ::c_ulong = 0x40046677;
 pub const FIONSPACE: ::c_ulong = 0x40046676;
 pub const FIOSEEKDATA: ::c_ulong = 0xc0086661;
diff --git a/src/unix/bsd/freebsdlike/freebsd/powerpc.rs b/src/unix/bsd/freebsdlike/freebsd/powerpc.rs
index f84062ba34b93..f85df97f3666a 100644
--- a/src/unix/bsd/freebsdlike/freebsd/powerpc.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/powerpc.rs
@@ -1,11 +1,78 @@
 pub type c_char = u8;
 pub type c_long = i32;
 pub type c_ulong = u32;
+pub type clock_t = u32;
 pub type wchar_t = i32;
 pub type time_t = i64;
 pub type suseconds_t = i32;
 pub type register_t = i32;
 
+cfg_if! {
+    if #[cfg(libc_align)] {
+        s_no_extra_traits! {
+            #[repr(align(16))]
+            pub struct mcontext_t {
+                pub mc_vers: ::c_int,
+                pub mc_flags: ::c_int,
+                pub mc_onstack: ::c_int,
+                pub mc_len: ::c_int,
+                pub mc_avec: [u64; 64],
+                pub mc_av: [u32; 2],
+                pub mc_frame: [::register_t; 42],
+                pub mc_fpreg: [u64; 33],
+                pub mc_vsxfpreg: [u64; 32],
+            }
+        }
+    }
+}
+
+cfg_if! {
+    if #[cfg(all(libc_align, feature = "extra_traits"))] {
+        impl PartialEq for mcontext_t {
+            fn eq(&self, other: &mcontext_t) -> bool {
+                self.mc_vers == other.mc_vers &&
+                self.mc_flags == other.mc_flags &&
+                self.mc_onstack == other.mc_onstack &&
+                self.mc_len == other.mc_len &&
+                self.mc_avec == other.mc_avec &&
+                self.mc_av == other.mc_av &&
+                self.mc_frame == other.mc_frame &&
+                self.mc_fpreg == other.mc_fpreg &&
+                self.mc_vsxfpreg == other.mc_vsxfpreg
+            }
+        }
+        impl Eq for mcontext_t {}
+        impl ::fmt::Debug for mcontext_t {
+            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
+                f.debug_struct("mcontext_t")
+                    .field("mc_vers", &self.mc_vers)
+                    .field("mc_flags", &self.mc_flags)
+                    .field("mc_onstack", &self.mc_onstack)
+                    .field("mc_len", &self.mc_len)
+                    .field("mc_avec", &self.mc_avec)
+                    .field("mc_av", &self.mc_av)
+                    .field("mc_frame", &self.mc_frame)
+                    .field("mc_fpreg", &self.mc_fpreg)
+                    .field("mc_vsxfpreg", &self.mc_vsxfpreg)
+                    .finish()
+            }
+        }
+        impl ::hash::Hash for mcontext_t {
+            fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
+                self.mc_vers.hash(state);
+                self.mc_flags.hash(state);
+                self.mc_onstack.hash(state);
+                self.mc_len.hash(state);
+                self.mc_avec.hash(state);
+                self.mc_av.hash(state);
+                self.mc_frame.hash(state);
+                self.mc_fpreg.hash(state);
+                self.mc_vsxfpreg.hash(state);
+            }
+        }
+    }
+}
+
 // should be pub(crate), but that requires Rust 1.18.0
 cfg_if! {
     if #[cfg(libc_const_size_of)] {
@@ -17,5 +84,8 @@ cfg_if! {
     }
 }
 
+pub const BIOCSRTIMEOUT: ::c_ulong = 0x8010426d;
+pub const BIOCGRTIMEOUT: ::c_ulong = 0x4010426e;
 pub const MAP_32BIT: ::c_int = 0x00080000;
 pub const MINSIGSTKSZ: ::size_t = 2048; // 512 * 4
+pub const TIOCTIMESTAMP: ::c_ulong = 0x40107459;
diff --git a/src/unix/bsd/freebsdlike/freebsd/powerpc64.rs b/src/unix/bsd/freebsdlike/freebsd/powerpc64.rs
index 69cf4c5fc88c7..1b2d59c31c0cd 100644
--- a/src/unix/bsd/freebsdlike/freebsd/powerpc64.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/powerpc64.rs
@@ -1,11 +1,78 @@
 pub type c_char = u8;
 pub type c_long = i64;
 pub type c_ulong = u64;
+pub type clock_t = u32;
 pub type wchar_t = i32;
 pub type time_t = i64;
 pub type suseconds_t = i64;
 pub type register_t = i64;
 
+cfg_if! {
+    if #[cfg(libc_align)] {
+        s_no_extra_traits! {
+            #[repr(align(16))]
+            pub struct mcontext_t {
+                pub mc_vers: ::c_int,
+                pub mc_flags: ::c_int,
+                pub mc_onstack: ::c_int,
+                pub mc_len: ::c_int,
+                pub mc_avec: [u64; 64],
+                pub mc_av: [u32; 2],
+                pub mc_frame: [::register_t; 42],
+                pub mc_fpreg: [u64; 33],
+                pub mc_vsxfpreg: [u64; 32],
+            }
+        }
+    }
+}
+
+cfg_if! {
+    if #[cfg(all(libc_align, feature = "extra_traits"))] {
+        impl PartialEq for mcontext_t {
+            fn eq(&self, other: &mcontext_t) -> bool {
+                self.mc_vers == other.mc_vers &&
+                self.mc_flags == other.mc_flags &&
+                self.mc_onstack == other.mc_onstack &&
+                self.mc_len == other.mc_len &&
+                self.mc_avec == other.mc_avec &&
+                self.mc_av == other.mc_av &&
+                self.mc_frame == other.mc_frame &&
+                self.mc_fpreg == other.mc_fpreg &&
+                self.mc_vsxfpreg == other.mc_vsxfpreg
+            }
+        }
+        impl Eq for mcontext_t {}
+        impl ::fmt::Debug for mcontext_t {
+            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
+                f.debug_struct("mcontext_t")
+                    .field("mc_vers", &self.mc_vers)
+                    .field("mc_flags", &self.mc_flags)
+                    .field("mc_onstack", &self.mc_onstack)
+                    .field("mc_len", &self.mc_len)
+                    .field("mc_avec", &self.mc_avec)
+                    .field("mc_av", &self.mc_av)
+                    .field("mc_frame", &self.mc_frame)
+                    .field("mc_fpreg", &self.mc_fpreg)
+                    .field("mc_vsxfpreg", &self.mc_vsxfpreg)
+                    .finish()
+            }
+        }
+        impl ::hash::Hash for mcontext_t {
+            fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
+                self.mc_vers.hash(state);
+                self.mc_flags.hash(state);
+                self.mc_onstack.hash(state);
+                self.mc_len.hash(state);
+                self.mc_avec.hash(state);
+                self.mc_av.hash(state);
+                self.mc_frame.hash(state);
+                self.mc_fpreg.hash(state);
+                self.mc_vsxfpreg.hash(state);
+            }
+        }
+    }
+}
+
 // should be pub(crate), but that requires Rust 1.18.0
 cfg_if! {
     if #[cfg(libc_const_size_of)] {
@@ -17,5 +84,8 @@ cfg_if! {
     }
 }
 
+pub const BIOCSRTIMEOUT: ::c_ulong = 0x8010426d;
+pub const BIOCGRTIMEOUT: ::c_ulong = 0x4010426e;
 pub const MAP_32BIT: ::c_int = 0x00080000;
 pub const MINSIGSTKSZ: ::size_t = 2048; // 512 * 4
+pub const TIOCTIMESTAMP: ::c_ulong = 0x40107459;
diff --git a/src/unix/bsd/freebsdlike/freebsd/riscv64.rs b/src/unix/bsd/freebsdlike/freebsd/riscv64.rs
index f9fa1c2750b22..bad84177e6f0a 100644
--- a/src/unix/bsd/freebsdlike/freebsd/riscv64.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/riscv64.rs
@@ -1,6 +1,7 @@
 pub type c_char = u8;
 pub type c_long = i64;
 pub type c_ulong = u64;
+pub type clock_t = i32;
 pub type wchar_t = ::c_int;
 pub type time_t = i64;
 pub type suseconds_t = ::c_long;
@@ -150,5 +151,8 @@ cfg_if! {
     }
 }
 
+pub const BIOCSRTIMEOUT: ::c_ulong = 0x8010426d;
+pub const BIOCGRTIMEOUT: ::c_ulong = 0x4010426e;
 pub const MAP_32BIT: ::c_int = 0x00080000;
 pub const MINSIGSTKSZ: ::size_t = 4096; // 1024 * 4
+pub const TIOCTIMESTAMP: ::c_ulong = 0x40107459;
diff --git a/src/unix/bsd/freebsdlike/freebsd/x86.rs b/src/unix/bsd/freebsdlike/freebsd/x86.rs
index 31a660e7d0a22..b9da7caa2001e 100644
--- a/src/unix/bsd/freebsdlike/freebsd/x86.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/x86.rs
@@ -1,54 +1,49 @@
 pub type c_char = i8;
 pub type c_long = i32;
 pub type c_ulong = u32;
+pub type clock_t = ::c_ulong;
 pub type wchar_t = i32;
 pub type time_t = i32;
 pub type suseconds_t = i32;
 pub type register_t = i32;
 
-s_no_extra_traits! {
-    pub struct mcontext_t {
-        pub mc_onstack: register_t,
-        pub mc_gs: register_t,
-        pub mc_fs: register_t,
-        pub mc_es: register_t,
-        pub mc_ds: register_t,
-        pub mc_edi: register_t,
-        pub mc_esi: register_t,
-        pub mc_ebp: register_t,
-        pub mc_isp: register_t,
-        pub mc_ebx: register_t,
-        pub mc_edx: register_t,
-        pub mc_ecx: register_t,
-        pub mc_eax: register_t,
-        pub mc_trapno: register_t,
-        pub mc_err: register_t,
-        pub mc_eip: register_t,
-        pub mc_cs: register_t,
-        pub mc_eflags: register_t,
-        pub mc_esp: register_t,
-        pub mc_ss: register_t,
-        pub mc_len: ::c_int,
-        pub mc_fpformat: ::c_int,
-        pub mc_ownedfp: ::c_int,
-        pub mc_flags: register_t,
-        pub mc_fpstate: [[::c_int; 32]; 4],
-        pub mc_fsbase: register_t,
-        pub mc_gsbase: register_t,
-        pub mc_xfpustate: register_t,
-        pub mc_xfpustate_len: register_t,
-        pub mc_spare2: [::c_int; 4],
-    }
-}
-
-s! {
-    pub struct ucontext_t {
-        pub uc_sigmask: ::sigset_t,
-        pub uc_mcontext: ::mcontext_t,
-        pub uc_link: *mut ::ucontext_t,
-        pub uc_stack: ::stack_t,
-        pub uc_flags: ::c_int,
-        __spare__: [::c_int; 4],
+cfg_if! {
+    if #[cfg(libc_align)] {
+        s_no_extra_traits! {
+            #[repr(align(16))]
+            pub struct mcontext_t {
+                pub mc_onstack: register_t,
+                pub mc_gs: register_t,
+                pub mc_fs: register_t,
+                pub mc_es: register_t,
+                pub mc_ds: register_t,
+                pub mc_edi: register_t,
+                pub mc_esi: register_t,
+                pub mc_ebp: register_t,
+                pub mc_isp: register_t,
+                pub mc_ebx: register_t,
+                pub mc_edx: register_t,
+                pub mc_ecx: register_t,
+                pub mc_eax: register_t,
+                pub mc_trapno: register_t,
+                pub mc_err: register_t,
+                pub mc_eip: register_t,
+                pub mc_cs: register_t,
+                pub mc_eflags: register_t,
+                pub mc_esp: register_t,
+                pub mc_ss: register_t,
+                pub mc_len: ::c_int,
+                pub mc_fpformat: ::c_int,
+                pub mc_ownedfp: ::c_int,
+                pub mc_flags: register_t,
+                pub mc_fpstate: [::c_int; 128],
+                pub mc_fsbase: register_t,
+                pub mc_gsbase: register_t,
+                pub mc_xfpustate: register_t,
+                pub mc_xfpustate_len: register_t,
+                pub mc_spare2: [::c_int; 4],
+            }
+        }
     }
 }
 
@@ -64,7 +59,7 @@ cfg_if! {
 }
 
 cfg_if! {
-    if #[cfg(feature = "extra_traits")] {
+    if #[cfg(all(libc_align, feature = "extra_traits"))] {
         impl PartialEq for mcontext_t {
             fn eq(&self, other: &mcontext_t) -> bool {
                 self.mc_onstack == other.mc_onstack &&
@@ -127,7 +122,8 @@ cfg_if! {
                     .field("mc_fpformat", &self.mc_fpformat)
                     .field("mc_ownedfp", &self.mc_ownedfp)
                     .field("mc_flags", &self.mc_flags)
-                    .field("mc_fpstate", &self.mc_fpstate)
+                    // FIXME(msrv) debug not supported for arrays in old MSRV
+                    // .field("mc_fpstate", &self.mc_fpstate)
                     .field("mc_fsbase", &self.mc_fsbase)
                     .field("mc_gsbase", &self.mc_gsbase)
                     .field("mc_xfpustate", &self.mc_xfpustate)
@@ -175,4 +171,7 @@ cfg_if! {
 
 pub const MINSIGSTKSZ: ::size_t = 2048; // 512 * 4
 
+pub const BIOCSRTIMEOUT: ::c_ulong = 0x8008426d;
+pub const BIOCGRTIMEOUT: ::c_ulong = 0x4008426e;
 pub const KINFO_FILE_SIZE: ::c_int = 1392;
+pub const TIOCTIMESTAMP: ::c_ulong = 0x40087459;
diff --git a/src/unix/bsd/freebsdlike/freebsd/x86_64/align.rs b/src/unix/bsd/freebsdlike/freebsd/x86_64/align.rs
index 3a016a0519852..208e7f2c90c0a 100644
--- a/src/unix/bsd/freebsdlike/freebsd/x86_64/align.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/x86_64/align.rs
@@ -184,14 +184,3 @@ cfg_if! {
         }
     }
 }
-
-s! {
-    pub struct ucontext_t {
-        pub uc_sigmask: ::sigset_t,
-        pub uc_mcontext: ::mcontext_t,
-        pub uc_link: *mut ::ucontext_t,
-        pub uc_stack: ::stack_t,
-        pub uc_flags: ::c_int,
-        __spare__: [::c_int; 4],
-    }
-}
diff --git a/src/unix/bsd/freebsdlike/freebsd/x86_64/mod.rs b/src/unix/bsd/freebsdlike/freebsd/x86_64/mod.rs
index fb4597927f3d6..446cc22dd1ba1 100644
--- a/src/unix/bsd/freebsdlike/freebsd/x86_64/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/x86_64/mod.rs
@@ -1,6 +1,7 @@
 pub type c_char = i8;
 pub type c_long = i64;
 pub type c_ulong = u64;
+pub type clock_t = i32;
 pub type wchar_t = i32;
 pub type time_t = i64;
 pub type suseconds_t = i64;
@@ -249,6 +250,10 @@ cfg_if! {
         pub const _ALIGNBYTES: usize = 8 - 1;
     }
 }
+
+pub const BIOCSRTIMEOUT: ::c_ulong = 0x8010426d;
+pub const BIOCGRTIMEOUT: ::c_ulong = 0x4010426e;
+
 pub const MAP_32BIT: ::c_int = 0x00080000;
 pub const MINSIGSTKSZ: ::size_t = 2048; // 512 * 4
 
@@ -265,6 +270,8 @@ pub const _MC_FPOWNED_PCB: c_long = 0x20002;
 
 pub const KINFO_FILE_SIZE: ::c_int = 1392;
 
+pub const TIOCTIMESTAMP: ::c_ulong = 0x40107459;
+
 cfg_if! {
     if #[cfg(libc_align)] {
         mod align;
diff --git a/src/unix/bsd/freebsdlike/mod.rs b/src/unix/bsd/freebsdlike/mod.rs
index 6ef1a59429207..d4749178f3c2c 100644
--- a/src/unix/bsd/freebsdlike/mod.rs
+++ b/src/unix/bsd/freebsdlike/mod.rs
@@ -1251,7 +1251,6 @@ pub const TIOCGETD: ::c_ulong = 0x4004741a;
 pub const TIOCSETD: ::c_ulong = 0x8004741b;
 pub const TIOCGDRAINWAIT: ::c_ulong = 0x40047456;
 pub const TIOCSDRAINWAIT: ::c_ulong = 0x80047457;
-pub const TIOCTIMESTAMP: ::c_ulong = 0x40107459;
 pub const TIOCMGDTRWAIT: ::c_ulong = 0x4004745a;
 pub const TIOCMSDTRWAIT: ::c_ulong = 0x8004745b;
 pub const TIOCDRAIN: ::c_ulong = 0x2000745e;
@@ -1306,10 +1305,15 @@ pub const BIOCSRSIG: ::c_ulong = 0x80044273;
 pub const BIOCSDLT: ::c_ulong = 0x80044278;
 pub const BIOCGSEESENT: ::c_ulong = 0x40044276;
 pub const BIOCSSEESENT: ::c_ulong = 0x80044277;
-pub const BIOCSETF: ::c_ulong = 0x80104267;
-pub const BIOCGDLTLIST: ::c_ulong = 0xc0104279;
-pub const BIOCSRTIMEOUT: ::c_ulong = 0x8010426d;
-pub const BIOCGRTIMEOUT: ::c_ulong = 0x4010426e;
+cfg_if! {
+    if #[cfg(target_pointer_width = "64")] {
+        pub const BIOCGDLTLIST: ::c_ulong = 0xc0104279;
+        pub const BIOCSETF: ::c_ulong = 0x80104267;
+    } else if #[cfg(target_pointer_width = "32")] {
+        pub const BIOCGDLTLIST: ::c_ulong = 0xc0084279;
+        pub const BIOCSETF: ::c_ulong = 0x80084267;
+    }
+}
 
 pub const FIODTYPE: ::c_ulong = 0x4004667a;
 pub const FIOGETLBA: ::c_ulong = 0x40046679;
diff --git a/src/unix/linux_like/android/b64/aarch64/align.rs b/src/unix/linux_like/android/b64/aarch64/align.rs
index 154c2c54ce6de..9832303d7ac46 100644
--- a/src/unix/linux_like/android/b64/aarch64/align.rs
+++ b/src/unix/linux_like/android/b64/aarch64/align.rs
@@ -4,17 +4,19 @@ s_no_extra_traits! {
     pub struct max_align_t {
         priv_: [f32; 8]
     }
-}
 
-s! {
+    #[allow(missing_debug_implementations)]
     pub struct ucontext_t {
         pub uc_flags: ::c_ulong,
         pub uc_link: *mut ucontext_t,
         pub uc_stack: ::stack_t,
         pub uc_sigmask: ::sigset_t,
+        pub __pad: [u8; 1024 / 8 - ::core::mem::size_of::<::sigset_t>()],
         pub uc_mcontext: mcontext_t,
     }
+}
 
+s! {
     #[repr(align(16))]
     pub struct mcontext_t {
         pub fault_address: ::c_ulonglong,