apple: Port mcontext and ucontext to the new layout

This includes `signal.h` stubs since that is a common header to import
these types.

Author: tgross35

src/new/apple/apple_libc/signal.rs

@@ -0,0 +1,5 @@
+//! Header: `signal.h`
+//!
+//! https://github.com/apple-oss-distributions/Libc/blob/main/include/signal.h
+
+pub use crate::sys::signal::*;

src/new/apple/mod.rs

@@ -0,0 +1,10 @@
+//! Entrypoint for Apple headers, usually found as part of the xcode SDK.
+
+pub(crate) mod xnu;
+pub(crate) use xnu::*;
+
+pub(crate) mod apple_libc {
+    pub(crate) mod signal;
+}
+
+pub(crate) use apple_libc::*;

src/new/apple/xnu/arm/_mcontext.rs

@@ -0,0 +1,15 @@
+//! Header: `arm/_mcontext.h`
+//!
+//! https://github.com/apple-oss-distributions/xnu/blob/main/bsd/arm/_mcontext.h
+
+pub use crate::mach::machine::_structs::*;
+
+s! {
+    pub struct __darwin_mcontext64 {
+        pub __es: __darwin_arm_exception_state64,
+        pub __ss: __darwin_arm_thread_state64,
+        pub __ns: __darwin_arm_neon_state64,
+    }
+}
+
+pub type mcontext_t = *mut __darwin_mcontext64;

src/new/apple/xnu/i386/_mcontext.rs

@@ -0,0 +1,15 @@
+//! Header: `i386/_mcontext.h`
+//!
+//! https://github.com/apple-oss-distributions/xnu/blob/main/bsd/i386/_mcontext.h
+
+pub use crate::mach::machine::_structs::*;
+
+s! {
+    pub struct __darwin_mcontext64 {
+        pub __es: __darwin_x86_exception_state64,
+        pub __ss: __darwin_x86_thread_state64,
+        pub __fs: __darwin_x86_float_state64,
+    }
+}
+
+pub type mcontext_t = *mut __darwin_mcontext64;

src/new/apple/xnu/mach/arm/_structs.rs

@@ -0,0 +1,37 @@
+//! Header: `arm/_structs.h`
+//!
+//! https://github.com/apple-oss-distributions/xnu/blob/main/osfmk/mach/arm/_structs.h
+
+#[cfg(target_arch = "arm")]
+use crate::prelude::*;
+
+s! {
+    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,
+    }
+
+    #[cfg(target_arch = "aarch64")]
+    pub struct __darwin_arm_neon_state64 {
+        pub __v: [crate::__uint128_t; 32],
+        pub __fpsr: u32,
+        pub __fpcr: u32,
+    }
+
+    #[cfg(target_arch = "arm")]
+    #[repr(align(16))]
+    pub struct __darwin_arm_neon_state64 {
+        opaque: [c_char; (32 * 16) + (2 * size_of::<u32>())],
+    }
+}

src/new/apple/xnu/mach/i386/_structs.rs

@@ -0,0 +1,89 @@
+use crate::prelude::*;
+
+s! {
+    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],
+    }
+
+    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_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,
+    }
+}

src/new/apple/xnu/mach/machine/_structs.rs

@@ -0,0 +1,11 @@
+//! Header: `mach/machine/_structs.h`
+
+cfg_if! {
+    if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
+        pub use crate::mach::i386::_structs::*;
+    } else if #[cfg(any(target_arch = "arm", target_arch = "aarch64"))] {
+        pub use crate::mach::arm::_structs::*;
+    } else {
+        // Unsupported arch
+    }
+}

src/new/apple/xnu/mach/mod.rs

@@ -0,0 +1,13 @@
+#[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
+pub(crate) mod arm {
+    pub(crate) mod _structs;
+}
+
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+pub(crate) mod i386 {
+    pub(crate) mod _structs;
+}
+
+pub(crate) mod machine {
+    pub(crate) mod _structs;
+}

src/new/apple/xnu/machine/_mcontext.rs

@@ -0,0 +1,11 @@
+//! Header: `machine/_mcontext.h`
+
+cfg_if! {
+    if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
+        pub use crate::i386::_mcontext::*;
+    } else if #[cfg(any(target_arch = "arm", target_arch = "aarch64"))] {
+        pub use crate::arm::_mcontext::*;
+    } else {
+        // Unsupported arch
+    }
+}

src/new/apple/xnu/mod.rs

@@ -0,0 +1,30 @@
+//! Source from XNU <https://github.com/apple-oss-distributions/xnu/tree/main>
+//!
+//! We omit nesting for the `bsd` module since most items of interest are in there.
+
+/// Directory: `arm/`
+///
+/// https://github.com/apple-oss-distributions/xnu/tree/main/bsd/arm
+#[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
+pub(crate) mod arm {
+    pub(crate) mod _mcontext;
+}
+
+/// Directory: `i386/`
+///
+/// https://github.com/apple-oss-distributions/xnu/tree/main/bsd/i386
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+pub(crate) mod i386 {
+    pub(crate) mod _mcontext;
+}
+
+pub(crate) mod mach;
+
+/// Directory: `machine/`
+///
+/// https://github.com/apple-oss-distributions/xnu/tree/main/bsd/machine
+pub(crate) mod machine {
+    pub(crate) mod _mcontext;
+}
+
+pub(crate) mod sys;