FreeBSD: Add ucontext_t, mcontext_t for all archs (rust-lang#3848)

[ gate ppc under `cfg(libc_align)` and adjust `Debug` implementations to
  meet msrv - Trevor ]
(backport <rust-lang#3848>)
(cherry picked from commit 2053d5b)

Author: nathaniel-bennett

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -1661,6 +1661,15 @@ s_no_extra_traits! {
         pub uc_flags: c_int,
         __spare__: [c_int; 4],
     }
+
+    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! {
@@ -2587,6 +2596,18 @@ 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)
+                    .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()
+            }
+        }
     }
 }
 

src/unix/bsd/freebsdlike/freebsd/x86.rs

@@ -118,7 +118,8 @@ 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)

src/unix/bsd/freebsdlike/freebsd/x86_64/align.rs

@@ -0,0 +1,186 @@
+use {c_long, register_t};
+
+s_no_extra_traits! {
+    #[allow(missing_debug_implementations)]
+    #[repr(align(16))]
+    pub struct max_align_t {
+        priv_: [f64; 4]
+    }
+
+    #[repr(align(16))]
+    pub struct mcontext_t {
+        pub mc_onstack: register_t,
+        pub mc_rdi: register_t,
+        pub mc_rsi: register_t,
+        pub mc_rdx: register_t,
+        pub mc_rcx: register_t,
+        pub mc_r8: register_t,
+        pub mc_r9: register_t,
+        pub mc_rax: register_t,
+        pub mc_rbx: register_t,
+        pub mc_rbp: register_t,
+        pub mc_r10: register_t,
+        pub mc_r11: register_t,
+        pub mc_r12: register_t,
+        pub mc_r13: register_t,
+        pub mc_r14: register_t,
+        pub mc_r15: register_t,
+        pub mc_trapno: u32,
+        pub mc_fs: u16,
+        pub mc_gs: u16,
+        pub mc_addr: register_t,
+        pub mc_flags: u32,
+        pub mc_es: u16,
+        pub mc_ds: u16,
+        pub mc_err: register_t,
+        pub mc_rip: register_t,
+        pub mc_cs: register_t,
+        pub mc_rflags: register_t,
+        pub mc_rsp: register_t,
+        pub mc_ss: register_t,
+        pub mc_len: c_long,
+        pub mc_fpformat: c_long,
+        pub mc_ownedfp: c_long,
+        pub mc_fpstate: [c_long; 64],
+        pub mc_fsbase: register_t,
+        pub mc_gsbase: register_t,
+        pub mc_xfpustate: register_t,
+        pub mc_xfpustate_len: register_t,
+        pub mc_spare: [c_long; 4],
+    }
+}
+
+cfg_if! {
+    if #[cfg(feature = "extra_traits")] {
+        impl PartialEq for mcontext_t {
+            fn eq(&self, other: &mcontext_t) -> bool {
+                self.mc_onstack == other.mc_onstack &&
+                self.mc_rdi == other.mc_rdi &&
+                self.mc_rsi == other.mc_rsi &&
+                self.mc_rdx == other.mc_rdx &&
+                self.mc_rcx == other.mc_rcx &&
+                self.mc_r8 == other.mc_r8 &&
+                self.mc_r9 == other.mc_r9 &&
+                self.mc_rax == other.mc_rax &&
+                self.mc_rbx == other.mc_rbx &&
+                self.mc_rbp == other.mc_rbp &&
+                self.mc_r10 == other.mc_r10 &&
+                self.mc_r11 == other.mc_r11 &&
+                self.mc_r12 == other.mc_r12 &&
+                self.mc_r13 == other.mc_r13 &&
+                self.mc_r14 == other.mc_r14 &&
+                self.mc_r15 == other.mc_r15 &&
+                self.mc_trapno == other.mc_trapno &&
+                self.mc_fs == other.mc_fs &&
+                self.mc_gs == other.mc_gs &&
+                self.mc_addr == other.mc_addr &&
+                self.mc_flags == other.mc_flags &&
+                self.mc_es == other.mc_es &&
+                self.mc_ds == other.mc_ds &&
+                self.mc_err == other.mc_err &&
+                self.mc_rip == other.mc_rip &&
+                self.mc_cs == other.mc_cs &&
+                self.mc_rflags == other.mc_rflags &&
+                self.mc_rsp == other.mc_rsp &&
+                self.mc_ss == other.mc_ss &&
+                self.mc_len == other.mc_len &&
+                self.mc_fpformat == other.mc_fpformat &&
+                self.mc_ownedfp == other.mc_ownedfp &&
+                self.mc_fpstate.iter().zip(other.mc_fpstate.iter())
+                .all(|(a, b)| a == b) &&
+                self.mc_fsbase == other.mc_fsbase &&
+                self.mc_gsbase == other.mc_gsbase &&
+                self.mc_xfpustate == other.mc_xfpustate &&
+                self.mc_xfpustate_len == other.mc_xfpustate_len &&
+                self.mc_spare == other.mc_spare
+            }
+        }
+        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_onstack", &self.mc_onstack)
+                    .field("mc_rdi", &self.mc_rdi)
+                    .field("mc_rsi", &self.mc_rsi)
+                    .field("mc_rdx", &self.mc_rdx)
+                    .field("mc_rcx", &self.mc_rcx)
+                    .field("mc_r8", &self.mc_r8)
+                    .field("mc_r9", &self.mc_r9)
+                    .field("mc_rax", &self.mc_rax)
+                    .field("mc_rbx", &self.mc_rbx)
+                    .field("mc_rbp", &self.mc_rbp)
+                    .field("mc_r10", &self.mc_r10)
+                    .field("mc_r11", &self.mc_r11)
+                    .field("mc_r12", &self.mc_r12)
+                    .field("mc_r13", &self.mc_r13)
+                    .field("mc_r14", &self.mc_r14)
+                    .field("mc_r15", &self.mc_r15)
+                    .field("mc_trapno", &self.mc_trapno)
+                    .field("mc_fs", &self.mc_fs)
+                    .field("mc_gs", &self.mc_gs)
+                    .field("mc_addr", &self.mc_addr)
+                    .field("mc_flags", &self.mc_flags)
+                    .field("mc_es", &self.mc_es)
+                    .field("mc_ds", &self.mc_ds)
+                    .field("mc_err", &self.mc_err)
+                    .field("mc_rip", &self.mc_rip)
+                    .field("mc_cs", &self.mc_cs)
+                    .field("mc_rflags", &self.mc_rflags)
+                    .field("mc_rsp", &self.mc_rsp)
+                    .field("mc_ss", &self.mc_ss)
+                    .field("mc_len", &self.mc_len)
+                    .field("mc_fpformat", &self.mc_fpformat)
+                    .field("mc_ownedfp", &self.mc_ownedfp)
+                    // FIXME: .field("mc_fpstate", &self.mc_fpstate)
+                    .field("mc_fsbase", &self.mc_fsbase)
+                    .field("mc_gsbase", &self.mc_gsbase)
+                    .field("mc_xfpustate", &self.mc_xfpustate)
+                    .field("mc_xfpustate_len", &self.mc_xfpustate_len)
+                    .field("mc_spare", &self.mc_spare)
+                    .finish()
+            }
+        }
+        impl ::hash::Hash for mcontext_t {
+            fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
+                self.mc_onstack.hash(state);
+                self.mc_rdi.hash(state);
+                self.mc_rsi.hash(state);
+                self.mc_rdx.hash(state);
+                self.mc_rcx.hash(state);
+                self.mc_r8.hash(state);
+                self.mc_r9.hash(state);
+                self.mc_rax.hash(state);
+                self.mc_rbx.hash(state);
+                self.mc_rbp.hash(state);
+                self.mc_r10.hash(state);
+                self.mc_r11.hash(state);
+                self.mc_r12.hash(state);
+                self.mc_r13.hash(state);
+                self.mc_r14.hash(state);
+                self.mc_r15.hash(state);
+                self.mc_trapno.hash(state);
+                self.mc_fs.hash(state);
+                self.mc_gs.hash(state);
+                self.mc_addr.hash(state);
+                self.mc_flags.hash(state);
+                self.mc_es.hash(state);
+                self.mc_ds.hash(state);
+                self.mc_err.hash(state);
+                self.mc_rip.hash(state);
+                self.mc_cs.hash(state);
+                self.mc_rflags.hash(state);
+                self.mc_rsp.hash(state);
+                self.mc_ss.hash(state);
+                self.mc_len.hash(state);
+                self.mc_fpformat.hash(state);
+                self.mc_ownedfp.hash(state);
+                self.mc_fpstate.hash(state);
+                self.mc_fsbase.hash(state);
+                self.mc_gsbase.hash(state);
+                self.mc_xfpustate.hash(state);
+                self.mc_xfpustate_len.hash(state);
+                self.mc_spare.hash(state);
+            }
+        }
+    }
+}