Auto merge of #2008 - bsteinb:macos-aarch64-mcontext, r=JohnTitor

Make test suite pass on macOS on aarch64

While working on #2007 I tried to run `cargo test` in `libc-test`, which failed, because the definition of `__darwin_mcontext64` was incomplete (see #1990). This adds definitions for the exception state and the floating point state as well.

`libc-test` still does not pass, because I use the type `[u128; 32]` for the `__v` field of `__darwin_arm_neon_state64` (in C it is `__uint128_t __v[32]`. `ctest2` does not translate `u128` to `__uint128_t` and the generated C code does not compile. Any ideas for working around this?

libc-test/build.rs

@@ -199,6 +199,8 @@ fn test_apple(target: &str) {
             "SF_SETTABLE" => true,
             // FIXME: the value has been changed since Catalina (VM_FLAGS_RESILIENT_MEDIA is also contained now).
             "VM_FLAGS_USER_REMAP" => true,
+            // FIXME: the values have been changed since Big Sur
+            "HW_TARGET" | "HW_PRODUCT" | "HW_MAXID" => true,
             _ => false,
         }
     });
@@ -220,6 +222,7 @@ fn test_apple(target: &str) {
         match (struct_, field) {
             // FIXME: the array size has been changed since macOS 10.15 ([8] -> [7]).
             ("statfs", "f_reserved") => true,
+            ("__darwin_arm_neon_state64", "__v") => true,
             _ => false,
         }
     });

src/unix/bsd/apple/b64/aarch64/align.rs

@@ -0,0 +1,48 @@
+pub type mcontext_t = *mut __darwin_mcontext64;
+
+s_no_extra_traits! {
+    #[allow(missing_debug_implementations)]
+    pub struct max_align_t {
+        priv_: f64
+    }
+}
+
+s! {
+    pub struct ucontext_t {
+        pub uc_onstack: ::c_int,
+        pub uc_sigmask: ::sigset_t,
+        pub uc_stack: ::stack_t,
+        pub uc_link: *mut ::ucontext_t,
+        pub uc_mcsize: usize,
+        pub uc_mcontext: mcontext_t,
+    }
+
+    pub struct __darwin_mcontext64 {
+        pub __es: __darwin_arm_exception_state64,
+        pub __ss: __darwin_arm_thread_state64,
+        pub __ns: __darwin_arm_neon_state64,
+    }
+
+    pub struct __darwin_arm_exception_state64 {
+        pub __far: u64,
+        pub __esr: u32,
+        pub __exception: u32,
+    }
+
+    pub struct __darwin_arm_thread_state64 {
+        pub __x: [u64; 29],
+        pub __fp: u64,
+        pub __lr: u64,
+        pub __sp: u64,
+        pub __pc: u64,
+        pub __cpsr: u32,
+        pub __pad: u32,
+    }
+
+    #[repr(align(16))]
+    pub struct __darwin_arm_neon_state64 {
+        pub __v: [[u64; 2]; 32],
+        pub __fpsr: u32,
+        pub __fpcr: u32,
+    }
+}

src/unix/bsd/apple/b64/aarch64/mod.rs

@@ -0,0 +1,8 @@
+pub type boolean_t = ::c_int;
+
+cfg_if! {
+    if #[cfg(libc_align)] {
+        mod align;
+        pub use self::align::*;
+    }
+}

src/unix/bsd/apple/b64/mod.rs

@@ -2,8 +2,6 @@
 
 pub type c_long = i64;
 pub type c_ulong = u64;
-pub type boolean_t = ::c_uint;
-pub type mcontext_t = *mut __darwin_mcontext64;
 
 s! {
     pub struct timeval32 {
@@ -49,77 +47,6 @@ s! {
         pub bh_datalen: u32,
         pub bh_hdrlen: ::c_ushort,
     }
-
-    pub struct ucontext_t {
-        pub uc_onstack: ::c_int,
-        pub uc_sigmask: ::sigset_t,
-        pub uc_stack: ::stack_t,
-        pub uc_link: *mut ::ucontext_t,
-        pub uc_mcsize: usize,
-        pub uc_mcontext: mcontext_t,
-    }
-
-    pub struct __darwin_x86_exception_state64 {
-        pub __trapno: u16,
-        pub __cpu: u16,
-        pub __err: u32,
-        pub __faultvaddr: u64,
-    }
-
-    pub struct __darwin_x86_float_state64 {
-        pub __fpu_reserved: [::c_int; 2],
-        __fpu_fcw: ::c_short,
-        __fpu_fsw: ::c_short,
-        pub __fpu_ftw: u8,
-        pub __fpu_rsrv1: u8,
-        pub __fpu_fop: u16,
-        pub __fpu_ip: u32,
-        pub __fpu_cs: u16,
-        pub __fpu_rsrv2: u16,
-        pub __fpu_dp: u32,
-        pub __fpu_ds: u16,
-        pub __fpu_rsrv3: u16,
-        pub __fpu_mxcsr: u32,
-        pub __fpu_mxcsrmask: u32,
-        pub __fpu_stmm0: __darwin_mmst_reg,
-        pub __fpu_stmm1: __darwin_mmst_reg,
-        pub __fpu_stmm2: __darwin_mmst_reg,
-        pub __fpu_stmm3: __darwin_mmst_reg,
-        pub __fpu_stmm4: __darwin_mmst_reg,
-        pub __fpu_stmm5: __darwin_mmst_reg,
-        pub __fpu_stmm6: __darwin_mmst_reg,
-        pub __fpu_stmm7: __darwin_mmst_reg,
-        pub __fpu_xmm0: __darwin_xmm_reg,
-        pub __fpu_xmm1: __darwin_xmm_reg,
-        pub __fpu_xmm2: __darwin_xmm_reg,
-        pub __fpu_xmm3: __darwin_xmm_reg,
-        pub __fpu_xmm4: __darwin_xmm_reg,
-        pub __fpu_xmm5: __darwin_xmm_reg,
-        pub __fpu_xmm6: __darwin_xmm_reg,
-        pub __fpu_xmm7: __darwin_xmm_reg,
-        pub __fpu_xmm8: __darwin_xmm_reg,
-        pub __fpu_xmm9: __darwin_xmm_reg,
-        pub __fpu_xmm10: __darwin_xmm_reg,
-        pub __fpu_xmm11: __darwin_xmm_reg,
-        pub __fpu_xmm12: __darwin_xmm_reg,
-        pub __fpu_xmm13: __darwin_xmm_reg,
-        pub __fpu_xmm14: __darwin_xmm_reg,
-        pub __fpu_xmm15: __darwin_xmm_reg,
-        // this field is actually [u8; 96], but defining it with a bigger type
-        // allows us to auto-implement traits for it since the length of the
-        // array is less than 32
-        __fpu_rsrv4: [u32; 24],
-        pub __fpu_reserved1: ::c_int,
-    }
-
-    pub struct __darwin_mmst_reg {
-        pub __mmst_reg: [::c_char; 10],
-        pub __mmst_rsrv: [::c_char; 6],
-    }
-
-    pub struct __darwin_xmm_reg {
-        pub __xmm_reg: [::c_char; 16],
-    }
 }
 
 s_no_extra_traits! {
@@ -184,13 +111,6 @@ extern "C" {
     ) -> ::c_int;
 }
 
-cfg_if! {
-    if #[cfg(libc_align)] {
-        mod align;
-        pub use self::align::*;
-    }
-}
-
 cfg_if! {
     if #[cfg(target_arch = "x86_64")] {
         mod x86_64;

src/unix/bsd/apple/b64/x86_64/align.rs

@@ -0,0 +1,7 @@
+s_no_extra_traits! {
+    #[allow(missing_debug_implementations)]
+    #[repr(align(16))]
+    pub struct max_align_t {
+        priv_: [f64; 2]
+    }
+}

src/unix/bsd/apple/b64/x86_64/mod.rs

@@ -0,0 +1,112 @@
+pub type boolean_t = ::c_uint;
+pub type mcontext_t = *mut __darwin_mcontext64;
+
+s! {
+    pub struct ucontext_t {
+        pub uc_onstack: ::c_int,
+        pub uc_sigmask: ::sigset_t,
+        pub uc_stack: ::stack_t,
+        pub uc_link: *mut ::ucontext_t,
+        pub uc_mcsize: usize,
+        pub uc_mcontext: mcontext_t,
+    }
+
+    pub struct __darwin_mcontext64 {
+        pub __es: __darwin_x86_exception_state64,
+        pub __ss: __darwin_x86_thread_state64,
+        pub __fs: __darwin_x86_float_state64,
+    }
+
+    pub struct __darwin_x86_exception_state64 {
+        pub __trapno: u16,
+        pub __cpu: u16,
+        pub __err: u32,
+        pub __faultvaddr: u64,
+    }
+
+    pub struct __darwin_x86_thread_state64 {
+        pub __rax: u64,
+        pub __rbx: u64,
+        pub __rcx: u64,
+        pub __rdx: u64,
+        pub __rdi: u64,
+        pub __rsi: u64,
+        pub __rbp: u64,
+        pub __rsp: u64,
+        pub __r8: u64,
+        pub __r9: u64,
+        pub __r10: u64,
+        pub __r11: u64,
+        pub __r12: u64,
+        pub __r13: u64,
+        pub __r14: u64,
+        pub __r15: u64,
+        pub __rip: u64,
+        pub __rflags: u64,
+        pub __cs: u64,
+        pub __fs: u64,
+        pub __gs: u64,
+    }
+
+    pub struct __darwin_x86_float_state64 {
+        pub __fpu_reserved: [::c_int; 2],
+        __fpu_fcw: ::c_short,
+        __fpu_fsw: ::c_short,
+        pub __fpu_ftw: u8,
+        pub __fpu_rsrv1: u8,
+        pub __fpu_fop: u16,
+        pub __fpu_ip: u32,
+        pub __fpu_cs: u16,
+        pub __fpu_rsrv2: u16,
+        pub __fpu_dp: u32,
+        pub __fpu_ds: u16,
+        pub __fpu_rsrv3: u16,
+        pub __fpu_mxcsr: u32,
+        pub __fpu_mxcsrmask: u32,
+        pub __fpu_stmm0: __darwin_mmst_reg,
+        pub __fpu_stmm1: __darwin_mmst_reg,
+        pub __fpu_stmm2: __darwin_mmst_reg,
+        pub __fpu_stmm3: __darwin_mmst_reg,
+        pub __fpu_stmm4: __darwin_mmst_reg,
+        pub __fpu_stmm5: __darwin_mmst_reg,
+        pub __fpu_stmm6: __darwin_mmst_reg,
+        pub __fpu_stmm7: __darwin_mmst_reg,
+        pub __fpu_xmm0: __darwin_xmm_reg,
+        pub __fpu_xmm1: __darwin_xmm_reg,
+        pub __fpu_xmm2: __darwin_xmm_reg,
+        pub __fpu_xmm3: __darwin_xmm_reg,
+        pub __fpu_xmm4: __darwin_xmm_reg,
+        pub __fpu_xmm5: __darwin_xmm_reg,
+        pub __fpu_xmm6: __darwin_xmm_reg,
+        pub __fpu_xmm7: __darwin_xmm_reg,
+        pub __fpu_xmm8: __darwin_xmm_reg,
+        pub __fpu_xmm9: __darwin_xmm_reg,
+        pub __fpu_xmm10: __darwin_xmm_reg,
+        pub __fpu_xmm11: __darwin_xmm_reg,
+        pub __fpu_xmm12: __darwin_xmm_reg,
+        pub __fpu_xmm13: __darwin_xmm_reg,
+        pub __fpu_xmm14: __darwin_xmm_reg,
+        pub __fpu_xmm15: __darwin_xmm_reg,
+        // this field is actually [u8; 96], but defining it with a bigger type
+        // allows us to auto-implement traits for it since the length of the
+        // array is less than 32
+        __fpu_rsrv4: [u32; 24],
+        pub __fpu_reserved1: ::c_int,
+    }
+
+    pub struct __darwin_mmst_reg {
+        pub __mmst_reg: [::c_char; 10],
+        pub __mmst_rsrv: [::c_char; 6],
+    }
+
+    pub struct __darwin_xmm_reg {
+        pub __xmm_reg: [::c_char; 16],
+    }
+}
+
+cfg_if! {
+    if #[cfg(libc_align)] {
+        mod align;
+        pub use self::align::*;
+    }
+}

src/unix/bsd/apple/mod.rs

@@ -1907,6 +1907,9 @@ pub const PTHREAD_PROCESS_PRIVATE: ::c_int = 2;
 pub const PTHREAD_PROCESS_SHARED: ::c_int = 1;
 pub const PTHREAD_CREATE_JOINABLE: ::c_int = 1;
 pub const PTHREAD_CREATE_DETACHED: ::c_int = 2;
+#[cfg(target_arch = "aarch64")]
+pub const PTHREAD_STACK_MIN: ::size_t = 16384;
+#[cfg(not(target_arch = "aarch64"))]
 pub const PTHREAD_STACK_MIN: ::size_t = 8192;
 
 pub const RLIMIT_CPU: ::c_int = 0;
@@ -2843,7 +2846,9 @@ pub const HW_L3CACHESIZE: ::c_int = 22;
 pub const HW_TB_FREQ: ::c_int = 23;
 pub const HW_MEMSIZE: ::c_int = 24;
 pub const HW_AVAILCPU: ::c_int = 25;
-pub const HW_MAXID: ::c_int = 26;
+pub const HW_TARGET: ::c_int = 26;
+pub const HW_PRODUCT: ::c_int = 27;
+pub const HW_MAXID: ::c_int = 28;
 pub const USER_CS_PATH: ::c_int = 1;
 pub const USER_BC_BASE_MAX: ::c_int = 2;
 pub const USER_BC_DIM_MAX: ::c_int = 3;
@@ -3129,6 +3134,9 @@ pub const SETALL: ::c_int = 9;
 // sys/shm.h
 pub const SHM_RDONLY: ::c_int = 0x1000;
 pub const SHM_RND: ::c_int = 0x2000;
+#[cfg(target_arch = "aarch64")]
+pub const SHMLBA: ::c_int = 16 * 1024;
+#[cfg(not(target_arch = "aarch64"))]
 pub const SHMLBA: ::c_int = 4096;
 pub const SHM_R: ::c_int = IPC_R;
 pub const SHM_W: ::c_int = IPC_W;

src/unix/bsd/mod.rs

@@ -632,7 +632,10 @@ extern "C" {
         egid: *mut ::gid_t,
     ) -> ::c_int;
 
-    #[cfg_attr(target_os = "macos", link_name = "glob$INODE64")]
+    #[cfg_attr(
+        all(target_os = "macos", not(target_arch = "aarch64")),
+        link_name = "glob$INODE64")
+    ]
     #[cfg_attr(target_os = "netbsd", link_name = "__glob30")]
     #[cfg_attr(
         all(target_os = "freebsd", any(freebsd11, freebsd10)),