Merging upstream version 1.67.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

48 files changed, 981 insertions, 1640 deletions

diff --git a/compiler/rustc_target/Cargo.toml b/compiler/rustc_target/Cargo.toml
index fc37fdb1c..568c916a1 100644
--- a/compiler/rustc_target/Cargo.toml
+++ b/compiler/rustc_target/Cargo.toml
@@ -7,6 +7,7 @@ edition = "2021"
 bitflags = "1.2.1"
 tracing = "0.1"
 serde_json = "1.0.59"
+rustc_abi = { path = "../rustc_abi" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_feature = { path = "../rustc_feature" }
 rustc_index = { path = "../rustc_index" }
diff --git a/compiler/rustc_target/src/abi/call/loongarch.rs b/compiler/rustc_target/src/abi/call/loongarch.rs
new file mode 100644
index 000000000..d29b479de
--- /dev/null
+++ b/compiler/rustc_target/src/abi/call/loongarch.rs
@@ -0,0 +1,342 @@
+use crate::abi::call::{ArgAbi, ArgExtension, CastTarget, FnAbi, PassMode, Reg, RegKind, Uniform};
+use crate::abi::{self, Abi, FieldsShape, HasDataLayout, Size, TyAbiInterface, TyAndLayout};
+use crate::spec::HasTargetSpec;
+
+#[derive(Copy, Clone)]
+enum RegPassKind {
+    Float(Reg),
+    Integer(Reg),
+    Unknown,
+}
+
+#[derive(Copy, Clone)]
+enum FloatConv {
+    FloatPair(Reg, Reg),
+    Float(Reg),
+    MixedPair(Reg, Reg),
+}
+
+#[derive(Copy, Clone)]
+struct CannotUseFpConv;
+
+fn is_loongarch_aggregate<'a, Ty>(arg: &ArgAbi<'a, Ty>) -> bool {
+    match arg.layout.abi {
+        Abi::Vector { .. } => true,
+        _ => arg.layout.is_aggregate(),
+    }
+}
+
+fn should_use_fp_conv_helper<'a, Ty, C>(
+    cx: &C,
+    arg_layout: &TyAndLayout<'a, Ty>,
+    xlen: u64,
+    flen: u64,
+    field1_kind: &mut RegPassKind,
+    field2_kind: &mut RegPassKind,
+) -> Result<(), CannotUseFpConv>
+where
+    Ty: TyAbiInterface<'a, C> + Copy,
+{
+    match arg_layout.abi {
+        Abi::Scalar(scalar) => match scalar.primitive() {
+            abi::Int(..) | abi::Pointer => {
+                if arg_layout.size.bits() > xlen {
+                    return Err(CannotUseFpConv);
+                }
+                match (*field1_kind, *field2_kind) {
+                    (RegPassKind::Unknown, _) => {
+                        *field1_kind = RegPassKind::Integer(Reg {
+                            kind: RegKind::Integer,
+                            size: arg_layout.size,
+                        });
+                    }
+                    (RegPassKind::Float(_), RegPassKind::Unknown) => {
+                        *field2_kind = RegPassKind::Integer(Reg {
+                            kind: RegKind::Integer,
+                            size: arg_layout.size,
+                        });
+                    }
+                    _ => return Err(CannotUseFpConv),
+                }
+            }
+            abi::F32 | abi::F64 => {
+                if arg_layout.size.bits() > flen {
+                    return Err(CannotUseFpConv);
+                }
+                match (*field1_kind, *field2_kind) {
+                    (RegPassKind::Unknown, _) => {
+                        *field1_kind =
+                            RegPassKind::Float(Reg { kind: RegKind::Float, size: arg_layout.size });
+                    }
+                    (_, RegPassKind::Unknown) => {
+                        *field2_kind =
+                            RegPassKind::Float(Reg { kind: RegKind::Float, size: arg_layout.size });
+                    }
+                    _ => return Err(CannotUseFpConv),
+                }
+            }
+        },
+        Abi::Vector { .. } | Abi::Uninhabited => return Err(CannotUseFpConv),
+        Abi::ScalarPair(..) | Abi::Aggregate { .. } => match arg_layout.fields {
+            FieldsShape::Primitive => {
+                unreachable!("aggregates can't have `FieldsShape::Primitive`")
+            }
+            FieldsShape::Union(_) => {
+                if !arg_layout.is_zst() {
+                    return Err(CannotUseFpConv);
+                }
+            }
+            FieldsShape::Array { count, .. } => {
+                for _ in 0..count {
+                    let elem_layout = arg_layout.field(cx, 0);
+                    should_use_fp_conv_helper(
+                        cx,
+                        &elem_layout,
+                        xlen,
+                        flen,
+                        field1_kind,
+                        field2_kind,
+                    )?;
+                }
+            }
+            FieldsShape::Arbitrary { .. } => {
+                match arg_layout.variants {
+                    abi::Variants::Multiple { .. } => return Err(CannotUseFpConv),
+                    abi::Variants::Single { .. } => (),
+                }
+                for i in arg_layout.fields.index_by_increasing_offset() {
+                    let field = arg_layout.field(cx, i);
+                    should_use_fp_conv_helper(cx, &field, xlen, flen, field1_kind, field2_kind)?;
+                }
+            }
+        },
+    }
+    Ok(())
+}
+
+fn should_use_fp_conv<'a, Ty, C>(
+    cx: &C,
+    arg: &TyAndLayout<'a, Ty>,
+    xlen: u64,
+    flen: u64,
+) -> Option<FloatConv>
+where
+    Ty: TyAbiInterface<'a, C> + Copy,
+{
+    let mut field1_kind = RegPassKind::Unknown;
+    let mut field2_kind = RegPassKind::Unknown;
+    if should_use_fp_conv_helper(cx, arg, xlen, flen, &mut field1_kind, &mut field2_kind).is_err() {
+        return None;
+    }
+    match (field1_kind, field2_kind) {
+        (RegPassKind::Integer(l), RegPassKind::Float(r)) => Some(FloatConv::MixedPair(l, r)),
+        (RegPassKind::Float(l), RegPassKind::Integer(r)) => Some(FloatConv::MixedPair(l, r)),
+        (RegPassKind::Float(l), RegPassKind::Float(r)) => Some(FloatConv::FloatPair(l, r)),
+        (RegPassKind::Float(f), RegPassKind::Unknown) => Some(FloatConv::Float(f)),
+        _ => None,
+    }
+}
+
+fn classify_ret<'a, Ty, C>(cx: &C, arg: &mut ArgAbi<'a, Ty>, xlen: u64, flen: u64) -> bool
+where
+    Ty: TyAbiInterface<'a, C> + Copy,
+{
+    if let Some(conv) = should_use_fp_conv(cx, &arg.layout, xlen, flen) {
+        match conv {
+            FloatConv::Float(f) => {
+                arg.cast_to(f);
+            }
+            FloatConv::FloatPair(l, r) => {
+                arg.cast_to(CastTarget::pair(l, r));
+            }
+            FloatConv::MixedPair(l, r) => {
+                arg.cast_to(CastTarget::pair(l, r));
+            }
+        }
+        return false;
+    }
+
+    let total = arg.layout.size;
+
+    // "Scalars wider than 2✕XLEN are passed by reference and are replaced in
+    // the argument list with the address."
+    // "Aggregates larger than 2✕XLEN bits are passed by reference and are
+    // replaced in the argument list with the address, as are C++ aggregates
+    // with nontrivial copy constructors, destructors, or vtables."
+    if total.bits() > 2 * xlen {
+        // We rely on the LLVM backend lowering code to lower passing a scalar larger than 2*XLEN.
+        if is_loongarch_aggregate(arg) {
+            arg.make_indirect();
+        }
+        return true;
+    }
+
+    let xlen_reg = match xlen {
+        32 => Reg::i32(),
+        64 => Reg::i64(),
+        _ => unreachable!("Unsupported XLEN: {}", xlen),
+    };
+    if is_loongarch_aggregate(arg) {
+        if total.bits() <= xlen {
+            arg.cast_to(xlen_reg);
+        } else {
+            arg.cast_to(Uniform { unit: xlen_reg, total: Size::from_bits(xlen * 2) });
+        }
+        return false;
+    }
+
+    // "When passed in registers, scalars narrower than XLEN bits are widened
+    // according to the sign of their type up to 32 bits, then sign-extended to
+    // XLEN bits."
+    extend_integer_width(arg, xlen);
+    false
+}
+
+fn classify_arg<'a, Ty, C>(
+    cx: &C,
+    arg: &mut ArgAbi<'a, Ty>,
+    xlen: u64,
+    flen: u64,
+    is_vararg: bool,
+    avail_gprs: &mut u64,
+    avail_fprs: &mut u64,
+) where
+    Ty: TyAbiInterface<'a, C> + Copy,
+{
+    if !is_vararg {
+        match should_use_fp_conv(cx, &arg.layout, xlen, flen) {
+            Some(FloatConv::Float(f)) if *avail_fprs >= 1 => {
+                *avail_fprs -= 1;
+                arg.cast_to(f);
+                return;
+            }
+            Some(FloatConv::FloatPair(l, r)) if *avail_fprs >= 2 => {
+                *avail_fprs -= 2;
+                arg.cast_to(CastTarget::pair(l, r));
+                return;
+            }
+            Some(FloatConv::MixedPair(l, r)) if *avail_fprs >= 1 && *avail_gprs >= 1 => {
+                *avail_gprs -= 1;
+                *avail_fprs -= 1;
+                arg.cast_to(CastTarget::pair(l, r));
+                return;
+            }
+            _ => (),
+        }
+    }
+
+    let total = arg.layout.size;
+    let align = arg.layout.align.abi.bits();
+
+    // "Scalars wider than 2✕XLEN are passed by reference and are replaced in
+    // the argument list with the address."
+    // "Aggregates larger than 2✕XLEN bits are passed by reference and are
+    // replaced in the argument list with the address, as are C++ aggregates
+    // with nontrivial copy constructors, destructors, or vtables."
+    if total.bits() > 2 * xlen {
+        // We rely on the LLVM backend lowering code to lower passing a scalar larger than 2*XLEN.
+        if is_loongarch_aggregate(arg) {
+            arg.make_indirect();
+        }
+        if *avail_gprs >= 1 {
+            *avail_gprs -= 1;
+        }
+        return;
+    }
+
+    let double_xlen_reg = match xlen {
+        32 => Reg::i64(),
+        64 => Reg::i128(),
+        _ => unreachable!("Unsupported XLEN: {}", xlen),
+    };
+
+    let xlen_reg = match xlen {
+        32 => Reg::i32(),
+        64 => Reg::i64(),
+        _ => unreachable!("Unsupported XLEN: {}", xlen),
+    };
+
+    if total.bits() > xlen {
+        let align_regs = align > xlen;
+        if is_loongarch_aggregate(arg) {
+            arg.cast_to(Uniform {
+                unit: if align_regs { double_xlen_reg } else { xlen_reg },
+                total: Size::from_bits(xlen * 2),
+            });
+        }
+        if align_regs && is_vararg {
+            *avail_gprs -= *avail_gprs % 2;
+        }
+        if *avail_gprs >= 2 {
+            *avail_gprs -= 2;
+        } else {
+            *avail_gprs = 0;
+        }
+        return;
+    } else if is_loongarch_aggregate(arg) {
+        arg.cast_to(xlen_reg);
+        if *avail_gprs >= 1 {
+            *avail_gprs -= 1;
+        }
+        return;
+    }
+
+    // "When passed in registers, scalars narrower than XLEN bits are widened
+    // according to the sign of their type up to 32 bits, then sign-extended to
+    // XLEN bits."
+    if *avail_gprs >= 1 {
+        extend_integer_width(arg, xlen);
+        *avail_gprs -= 1;
+    }
+}
+
+fn extend_integer_width<'a, Ty>(arg: &mut ArgAbi<'a, Ty>, xlen: u64) {
+    if let Abi::Scalar(scalar) = arg.layout.abi {
+        if let abi::Int(i, _) = scalar.primitive() {
+            // 32-bit integers are always sign-extended
+            if i.size().bits() == 32 && xlen > 32 {
+                if let PassMode::Direct(ref mut attrs) = arg.mode {
+                    attrs.ext(ArgExtension::Sext);
+                    return;
+                }
+            }
+        }
+    }
+
+    arg.extend_integer_width_to(xlen);
+}
+
+pub fn compute_abi_info<'a, Ty, C>(cx: &C, fn_abi: &mut FnAbi<'a, Ty>)
+where
+    Ty: TyAbiInterface<'a, C> + Copy,
+    C: HasDataLayout + HasTargetSpec,
+{
+    let xlen = cx.data_layout().pointer_size.bits();
+    let flen = match &cx.target_spec().llvm_abiname[..] {
+        "ilp32f" | "lp64f" => 32,
+        "ilp32d" | "lp64d" => 64,
+        _ => 0,
+    };
+
+    let mut avail_gprs = 8;
+    let mut avail_fprs = 8;
+
+    if !fn_abi.ret.is_ignore() && classify_ret(cx, &mut fn_abi.ret, xlen, flen) {
+        avail_gprs -= 1;
+    }
+
+    for (i, arg) in fn_abi.args.iter_mut().enumerate() {
+        if arg.is_ignore() {
+            continue;
+        }
+        classify_arg(
+            cx,
+            arg,
+            xlen,
+            flen,
+            i >= fn_abi.fixed_count as usize,
+            &mut avail_gprs,
+            &mut avail_fprs,
+        );
+    }
+}
diff --git a/compiler/rustc_target/src/abi/call/mod.rs b/compiler/rustc_target/src/abi/call/mod.rs
index 9e5f0e4d1..a5ffaebea 100644
--- a/compiler/rustc_target/src/abi/call/mod.rs
+++ b/compiler/rustc_target/src/abi/call/mod.rs
@@ -3,6 +3,7 @@ use crate::abi::{HasDataLayout, TyAbiInterface, TyAndLayout};
 use crate::spec::{self, HasTargetSpec};
 use rustc_span::Symbol;
 use std::fmt;
+use std::str::FromStr;
 
 mod aarch64;
 mod amdgpu;
@@ -10,6 +11,7 @@ mod arm;
 mod avr;
 mod bpf;
 mod hexagon;
+mod loongarch;
 mod m68k;
 mod mips;
 mod mips64;
@@ -260,7 +262,7 @@ impl CastTarget {
         let mut size = self.rest.total;
         for i in 0..self.prefix.iter().count() {
             match self.prefix[i] {
-                Some(v) => size += Size { raw: v.size.bytes() },
+                Some(v) => size += v.size,
                 None => {}
             }
         }
@@ -696,6 +698,7 @@ impl<'a, Ty> FnAbi<'a, Ty> {
             "amdgpu" => amdgpu::compute_abi_info(cx, self),
             "arm" => arm::compute_abi_info(cx, self),
             "avr" => avr::compute_abi_info(self),
+            "loongarch64" => loongarch::compute_abi_info(cx, self),
             "m68k" => m68k::compute_abi_info(self),
             "mips" => mips::compute_abi_info(cx, self),
             "mips64" => mips64::compute_abi_info(cx, self),
@@ -735,6 +738,33 @@ impl<'a, Ty> FnAbi<'a, Ty> {
     }
 }
 
+impl FromStr for Conv {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "C" => Ok(Conv::C),
+            "Rust" => Ok(Conv::Rust),
+            "RustCold" => Ok(Conv::Rust),
+            "ArmAapcs" => Ok(Conv::ArmAapcs),
+            "CCmseNonSecureCall" => Ok(Conv::CCmseNonSecureCall),
+            "Msp430Intr" => Ok(Conv::Msp430Intr),
+            "PtxKernel" => Ok(Conv::PtxKernel),
+            "X86Fastcall" => Ok(Conv::X86Fastcall),
+            "X86Intr" => Ok(Conv::X86Intr),
+            "X86Stdcall" => Ok(Conv::X86Stdcall),
+            "X86ThisCall" => Ok(Conv::X86ThisCall),
+            "X86VectorCall" => Ok(Conv::X86VectorCall),
+            "X86_64SysV" => Ok(Conv::X86_64SysV),
+            "X86_64Win64" => Ok(Conv::X86_64Win64),
+            "AmdGpuKernel" => Ok(Conv::AmdGpuKernel),
+            "AvrInterrupt" => Ok(Conv::AvrInterrupt),
+            "AvrNonBlockingInterrupt" => Ok(Conv::AvrNonBlockingInterrupt),
+            _ => Err(format!("'{}' is not a valid value for entry function call convetion.", s)),
+        }
+    }
+}
+
 // Some types are used a lot. Make sure they don't unintentionally get bigger.
 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 mod size_asserts {
diff --git a/compiler/rustc_target/src/abi/call/sparc64.rs b/compiler/rustc_target/src/abi/call/sparc64.rs
index 1b74959ad..c8b6ac5ae 100644
--- a/compiler/rustc_target/src/abi/call/sparc64.rs
+++ b/compiler/rustc_target/src/abi/call/sparc64.rs
@@ -78,7 +78,7 @@ fn arg_scalar_pair<C>(
 where
     C: HasDataLayout,
 {
-    data = arg_scalar(cx, &scalar1, offset, data);
+    data = arg_scalar(cx, scalar1, offset, data);
     match (scalar1.primitive(), scalar2.primitive()) {
         (abi::F32, _) => offset += Reg::f32().size,
         (_, abi::F64) => offset += Reg::f64().size,
@@ -87,10 +87,10 @@ where
         _ => {}
     }
 
-    if (offset.raw % 4) != 0 && scalar2.primitive().is_float() {
-        offset.raw += 4 - (offset.raw % 4);
+    if (offset.bytes() % 4) != 0 && scalar2.primitive().is_float() {
+        offset += Size::from_bytes(4 - (offset.bytes() % 4));
     }
-    data = arg_scalar(cx, &scalar2, offset, data);
+    data = arg_scalar(cx, scalar2, offset, data);
     return data;
 }
 
@@ -169,14 +169,14 @@ where
                     has_float: false,
                     arg_attribute: ArgAttribute::default(),
                 },
-                Size { raw: 0 },
+                Size::ZERO,
             );
 
             if data.has_float {
                 // Structure { float, int, int } doesn't like to be handled like
                 // { float, long int }. Other way around it doesn't mind.
                 if data.last_offset < arg.layout.size
-                    && (data.last_offset.raw % 8) != 0
+                    && (data.last_offset.bytes() % 8) != 0
                     && data.prefix_index < data.prefix.len()
                 {
                     data.prefix[data.prefix_index] = Some(Reg::i32());
@@ -185,7 +185,7 @@ where
                 }
 
                 let mut rest_size = arg.layout.size - data.last_offset;
-                if (rest_size.raw % 8) != 0 && data.prefix_index < data.prefix.len() {
+                if (rest_size.bytes() % 8) != 0 && data.prefix_index < data.prefix.len() {
                     data.prefix[data.prefix_index] = Some(Reg::i32());
                     rest_size = rest_size - Reg::i32().size;
                 }
@@ -214,13 +214,13 @@ where
     C: HasDataLayout,
 {
     if !fn_abi.ret.is_ignore() {
-        classify_arg(cx, &mut fn_abi.ret, Size { raw: 32 });
+        classify_arg(cx, &mut fn_abi.ret, Size::from_bytes(32));
     }
 
     for arg in fn_abi.args.iter_mut() {
         if arg.is_ignore() {
             continue;
         }
-        classify_arg(cx, arg, Size { raw: 16 });
+        classify_arg(cx, arg, Size::from_bytes(16));
     }
 }
diff --git a/compiler/rustc_target/src/abi/mod.rs b/compiler/rustc_target/src/abi/mod.rs
index 7171ca7bf..53c9878ab 100644
--- a/compiler/rustc_target/src/abi/mod.rs
+++ b/compiler/rustc_target/src/abi/mod.rs
@@ -2,284 +2,16 @@ pub use Integer::*;
 pub use Primitive::*;
 
 use crate::json::{Json, ToJson};
-use crate::spec::Target;
 
-use std::convert::{TryFrom, TryInto};
 use std::fmt;
-use std::iter::Step;
-use std::num::{NonZeroUsize, ParseIntError};
-use std::ops::{Add, AddAssign, Deref, Mul, RangeInclusive, Sub};
-use std::str::FromStr;
+use std::ops::Deref;
 
 use rustc_data_structures::intern::Interned;
-use rustc_index::vec::{Idx, IndexVec};
 use rustc_macros::HashStable_Generic;
 
 pub mod call;
 
-/// Parsed [Data layout](https://llvm.org/docs/LangRef.html#data-layout)
-/// for a target, which contains everything needed to compute layouts.
-pub struct TargetDataLayout {
-    pub endian: Endian,
-    pub i1_align: AbiAndPrefAlign,
-    pub i8_align: AbiAndPrefAlign,
-    pub i16_align: AbiAndPrefAlign,
-    pub i32_align: AbiAndPrefAlign,
-    pub i64_align: AbiAndPrefAlign,
-    pub i128_align: AbiAndPrefAlign,
-    pub f32_align: AbiAndPrefAlign,
-    pub f64_align: AbiAndPrefAlign,
-    pub pointer_size: Size,
-    pub pointer_align: AbiAndPrefAlign,
-    pub aggregate_align: AbiAndPrefAlign,
-
-    /// Alignments for vector types.
-    pub vector_align: Vec<(Size, AbiAndPrefAlign)>,
-
-    pub instruction_address_space: AddressSpace,
-
-    /// Minimum size of #[repr(C)] enums (default I32 bits)
-    pub c_enum_min_size: Integer,
-}
-
-impl Default for TargetDataLayout {
-    /// Creates an instance of `TargetDataLayout`.
-    fn default() -> TargetDataLayout {
-        let align = |bits| Align::from_bits(bits).unwrap();
-        TargetDataLayout {
-            endian: Endian::Big,
-            i1_align: AbiAndPrefAlign::new(align(8)),
-            i8_align: AbiAndPrefAlign::new(align(8)),
-            i16_align: AbiAndPrefAlign::new(align(16)),
-            i32_align: AbiAndPrefAlign::new(align(32)),
-            i64_align: AbiAndPrefAlign { abi: align(32), pref: align(64) },
-            i128_align: AbiAndPrefAlign { abi: align(32), pref: align(64) },
-            f32_align: AbiAndPrefAlign::new(align(32)),
-            f64_align: AbiAndPrefAlign::new(align(64)),
-            pointer_size: Size::from_bits(64),
-            pointer_align: AbiAndPrefAlign::new(align(64)),
-            aggregate_align: AbiAndPrefAlign { abi: align(0), pref: align(64) },
-            vector_align: vec![
-                (Size::from_bits(64), AbiAndPrefAlign::new(align(64))),
-                (Size::from_bits(128), AbiAndPrefAlign::new(align(128))),
-            ],
-            instruction_address_space: AddressSpace::DATA,
-            c_enum_min_size: Integer::I32,
-        }
-    }
-}
-
-pub enum TargetDataLayoutErrors<'a> {
-    InvalidAddressSpace { addr_space: &'a str, cause: &'a str, err: ParseIntError },
-    InvalidBits { kind: &'a str, bit: &'a str, cause: &'a str, err: ParseIntError },
-    MissingAlignment { cause: &'a str },
-    InvalidAlignment { cause: &'a str, err: String },
-    InconsistentTargetArchitecture { dl: &'a str, target: &'a str },
-    InconsistentTargetPointerWidth { pointer_size: u64, target: u32 },
-    InvalidBitsSize { err: String },
-}
-
-impl TargetDataLayout {
-    pub fn parse<'a>(target: &'a Target) -> Result<TargetDataLayout, TargetDataLayoutErrors<'a>> {
-        // Parse an address space index from a string.
-        let parse_address_space = |s: &'a str, cause: &'a str| {
-            s.parse::<u32>().map(AddressSpace).map_err(|err| {
-                TargetDataLayoutErrors::InvalidAddressSpace { addr_space: s, cause, err }
-            })
-        };
-
-        // Parse a bit count from a string.
-        let parse_bits = |s: &'a str, kind: &'a str, cause: &'a str| {
-            s.parse::<u64>().map_err(|err| TargetDataLayoutErrors::InvalidBits {
-                kind,
-                bit: s,
-                cause,
-                err,
-            })
-        };
-
-        // Parse a size string.
-        let size = |s: &'a str, cause: &'a str| parse_bits(s, "size", cause).map(Size::from_bits);
-
-        // Parse an alignment string.
-        let align = |s: &[&'a str], cause: &'a str| {
-            if s.is_empty() {
-                return Err(TargetDataLayoutErrors::MissingAlignment { cause });
-            }
-            let align_from_bits = |bits| {
-                Align::from_bits(bits)
-                    .map_err(|err| TargetDataLayoutErrors::InvalidAlignment { cause, err })
-            };
-            let abi = parse_bits(s[0], "alignment", cause)?;
-            let pref = s.get(1).map_or(Ok(abi), |pref| parse_bits(pref, "alignment", cause))?;
-            Ok(AbiAndPrefAlign { abi: align_from_bits(abi)?, pref: align_from_bits(pref)? })
-        };
-
-        let mut dl = TargetDataLayout::default();
-        let mut i128_align_src = 64;
-        for spec in target.data_layout.split('-') {
-            let spec_parts = spec.split(':').collect::<Vec<_>>();
-
-            match &*spec_parts {
-                ["e"] => dl.endian = Endian::Little,
-                ["E"] => dl.endian = Endian::Big,
-                [p] if p.starts_with('P') => {
-                    dl.instruction_address_space = parse_address_space(&p[1..], "P")?
-                }
-                ["a", ref a @ ..] => dl.aggregate_align = align(a, "a")?,
-                ["f32", ref a @ ..] => dl.f32_align = align(a, "f32")?,
-                ["f64", ref a @ ..] => dl.f64_align = align(a, "f64")?,
-                [p @ "p", s, ref a @ ..] | [p @ "p0", s, ref a @ ..] => {
-                    dl.pointer_size = size(s, p)?;
-                    dl.pointer_align = align(a, p)?;
-                }
-                [s, ref a @ ..] if s.starts_with('i') => {
-                    let Ok(bits) = s[1..].parse::<u64>() else {
-                        size(&s[1..], "i")?; // For the user error.
-                        continue;
-                    };
-                    let a = align(a, s)?;
-                    match bits {
-                        1 => dl.i1_align = a,
-                        8 => dl.i8_align = a,
-                        16 => dl.i16_align = a,
-                        32 => dl.i32_align = a,
-                        64 => dl.i64_align = a,
-                        _ => {}
-                    }
-                    if bits >= i128_align_src && bits <= 128 {
-                        // Default alignment for i128 is decided by taking the alignment of
-                        // largest-sized i{64..=128}.
-                        i128_align_src = bits;
-                        dl.i128_align = a;
-                    }
-                }
-                [s, ref a @ ..] if s.starts_with('v') => {
-                    let v_size = size(&s[1..], "v")?;
-                    let a = align(a, s)?;
-                    if let Some(v) = dl.vector_align.iter_mut().find(|v| v.0 == v_size) {
-                        v.1 = a;
-                        continue;
-                    }
-                    // No existing entry, add a new one.
-                    dl.vector_align.push((v_size, a));
-                }
-                _ => {} // Ignore everything else.
-            }
-        }
-
-        // Perform consistency checks against the Target information.
-        if dl.endian != target.endian {
-            return Err(TargetDataLayoutErrors::InconsistentTargetArchitecture {
-                dl: dl.endian.as_str(),
-                target: target.endian.as_str(),
-            });
-        }
-
-        let target_pointer_width: u64 = target.pointer_width.into();
-        if dl.pointer_size.bits() != target_pointer_width {
-            return Err(TargetDataLayoutErrors::InconsistentTargetPointerWidth {
-                pointer_size: dl.pointer_size.bits(),
-                target: target.pointer_width,
-            });
-        }
-
-        dl.c_enum_min_size = match Integer::from_size(Size::from_bits(target.c_enum_min_bits)) {
-            Ok(bits) => bits,
-            Err(err) => return Err(TargetDataLayoutErrors::InvalidBitsSize { err }),
-        };
-
-        Ok(dl)
-    }
-
-    /// Returns exclusive upper bound on object size.
-    ///
-    /// The theoretical maximum object size is defined as the maximum positive `isize` value.
-    /// This ensures that the `offset` semantics remain well-defined by allowing it to correctly
-    /// index every address within an object along with one byte past the end, along with allowing
-    /// `isize` to store the difference between any two pointers into an object.
-    ///
-    /// The upper bound on 64-bit currently needs to be lower because LLVM uses a 64-bit integer
-    /// to represent object size in bits. It would need to be 1 << 61 to account for this, but is
-    /// currently conservatively bounded to 1 << 47 as that is enough to cover the current usable
-    /// address space on 64-bit ARMv8 and x86_64.
-    #[inline]
-    pub fn obj_size_bound(&self) -> u64 {
-        match self.pointer_size.bits() {
-            16 => 1 << 15,
-            32 => 1 << 31,
-            64 => 1 << 47,
-            bits => panic!("obj_size_bound: unknown pointer bit size {}", bits),
-        }
-    }
-
-    #[inline]
-    pub fn ptr_sized_integer(&self) -> Integer {
-        match self.pointer_size.bits() {
-            16 => I16,
-            32 => I32,
-            64 => I64,
-            bits => panic!("ptr_sized_integer: unknown pointer bit size {}", bits),
-        }
-    }
-
-    #[inline]
-    pub fn vector_align(&self, vec_size: Size) -> AbiAndPrefAlign {
-        for &(size, align) in &self.vector_align {
-            if size == vec_size {
-                return align;
-            }
-        }
-        // Default to natural alignment, which is what LLVM does.
-        // That is, use the size, rounded up to a power of 2.
-        AbiAndPrefAlign::new(Align::from_bytes(vec_size.bytes().next_power_of_two()).unwrap())
-    }
-}
-
-pub trait HasDataLayout {
-    fn data_layout(&self) -> &TargetDataLayout;
-}
-
-impl HasDataLayout for TargetDataLayout {
-    #[inline]
-    fn data_layout(&self) -> &TargetDataLayout {
-        self
-    }
-}
-
-/// Endianness of the target, which must match cfg(target-endian).
-#[derive(Copy, Clone, PartialEq)]
-pub enum Endian {
-    Little,
-    Big,
-}
-
-impl Endian {
-    pub fn as_str(&self) -> &'static str {
-        match self {
-            Self::Little => "little",
-            Self::Big => "big",
-        }
-    }
-}
-
-impl fmt::Debug for Endian {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.write_str(self.as_str())
-    }
-}
-
-impl FromStr for Endian {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        match s {
-            "little" => Ok(Self::Little),
-            "big" => Ok(Self::Big),
-            _ => Err(format!(r#"unknown endian: "{}""#, s)),
-        }
-    }
-}
+pub use rustc_abi::*;
 
 impl ToJson for Endian {
     fn to_json(&self) -> Json {
@@ -287,1025 +19,15 @@ impl ToJson for Endian {
     }
 }
 
-/// Size of a type in bytes.
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Encodable, Decodable)]
-#[derive(HashStable_Generic)]
-pub struct Size {
-    raw: u64,
-}
-
-// This is debug-printed a lot in larger structs, don't waste too much space there
-impl fmt::Debug for Size {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "Size({} bytes)", self.bytes())
-    }
-}
-
-impl Size {
-    pub const ZERO: Size = Size { raw: 0 };
-
-    /// Rounds `bits` up to the next-higher byte boundary, if `bits` is
-    /// not a multiple of 8.
-    pub fn from_bits(bits: impl TryInto<u64>) -> Size {
-        let bits = bits.try_into().ok().unwrap();
-        // Avoid potential overflow from `bits + 7`.
-        Size { raw: bits / 8 + ((bits % 8) + 7) / 8 }
-    }
-
-    #[inline]
-    pub fn from_bytes(bytes: impl TryInto<u64>) -> Size {
-        let bytes: u64 = bytes.try_into().ok().unwrap();
-        Size { raw: bytes }
-    }
-
-    #[inline]
-    pub fn bytes(self) -> u64 {
-        self.raw
-    }
-
-    #[inline]
-    pub fn bytes_usize(self) -> usize {
-        self.bytes().try_into().unwrap()
-    }
-
-    #[inline]
-    pub fn bits(self) -> u64 {
-        #[cold]
-        fn overflow(bytes: u64) -> ! {
-            panic!("Size::bits: {} bytes in bits doesn't fit in u64", bytes)
-        }
-
-        self.bytes().checked_mul(8).unwrap_or_else(|| overflow(self.bytes()))
-    }
-
-    #[inline]
-    pub fn bits_usize(self) -> usize {
-        self.bits().try_into().unwrap()
-    }
-
-    #[inline]
-    pub fn align_to(self, align: Align) -> Size {
-        let mask = align.bytes() - 1;
-        Size::from_bytes((self.bytes() + mask) & !mask)
-    }
-
-    #[inline]
-    pub fn is_aligned(self, align: Align) -> bool {
-        let mask = align.bytes() - 1;
-        self.bytes() & mask == 0
-    }
-
-    #[inline]
-    pub fn checked_add<C: HasDataLayout>(self, offset: Size, cx: &C) -> Option<Size> {
-        let dl = cx.data_layout();
-
-        let bytes = self.bytes().checked_add(offset.bytes())?;
-
-        if bytes < dl.obj_size_bound() { Some(Size::from_bytes(bytes)) } else { None }
-    }
-
-    #[inline]
-    pub fn checked_mul<C: HasDataLayout>(self, count: u64, cx: &C) -> Option<Size> {
-        let dl = cx.data_layout();
-
-        let bytes = self.bytes().checked_mul(count)?;
-        if bytes < dl.obj_size_bound() { Some(Size::from_bytes(bytes)) } else { None }
-    }
-
-    /// Truncates `value` to `self` bits and then sign-extends it to 128 bits
-    /// (i.e., if it is negative, fill with 1's on the left).
-    #[inline]
-    pub fn sign_extend(self, value: u128) -> u128 {
-        let size = self.bits();
-        if size == 0 {
-            // Truncated until nothing is left.
-            return 0;
-        }
-        // Sign-extend it.
-        let shift = 128 - size;
-        // Shift the unsigned value to the left, then shift back to the right as signed
-        // (essentially fills with sign bit on the left).
-        (((value << shift) as i128) >> shift) as u128
-    }
-
-    /// Truncates `value` to `self` bits.
-    #[inline]
-    pub fn truncate(self, value: u128) -> u128 {
-        let size = self.bits();
-        if size == 0 {
-            // Truncated until nothing is left.
-            return 0;
-        }
-        let shift = 128 - size;
-        // Truncate (shift left to drop out leftover values, shift right to fill with zeroes).
-        (value << shift) >> shift
-    }
-
-    #[inline]
-    pub fn signed_int_min(&self) -> i128 {
-        self.sign_extend(1_u128 << (self.bits() - 1)) as i128
-    }
-
-    #[inline]
-    pub fn signed_int_max(&self) -> i128 {
-        i128::MAX >> (128 - self.bits())
-    }
-
-    #[inline]
-    pub fn unsigned_int_max(&self) -> u128 {
-        u128::MAX >> (128 - self.bits())
-    }
-}
-
-// Panicking addition, subtraction and multiplication for convenience.
-// Avoid during layout computation, return `LayoutError` instead.
-
-impl Add for Size {
-    type Output = Size;
-    #[inline]
-    fn add(self, other: Size) -> Size {
-        Size::from_bytes(self.bytes().checked_add(other.bytes()).unwrap_or_else(|| {
-            panic!("Size::add: {} + {} doesn't fit in u64", self.bytes(), other.bytes())
-        }))
-    }
-}
-
-impl Sub for Size {
-    type Output = Size;
-    #[inline]
-    fn sub(self, other: Size) -> Size {
-        Size::from_bytes(self.bytes().checked_sub(other.bytes()).unwrap_or_else(|| {
-            panic!("Size::sub: {} - {} would result in negative size", self.bytes(), other.bytes())
-        }))
-    }
-}
-
-impl Mul<Size> for u64 {
-    type Output = Size;
-    #[inline]
-    fn mul(self, size: Size) -> Size {
-        size * self
-    }
-}
-
-impl Mul<u64> for Size {
-    type Output = Size;
-    #[inline]
-    fn mul(self, count: u64) -> Size {
-        match self.bytes().checked_mul(count) {
-            Some(bytes) => Size::from_bytes(bytes),
-            None => panic!("Size::mul: {} * {} doesn't fit in u64", self.bytes(), count),
-        }
-    }
-}
-
-impl AddAssign for Size {
-    #[inline]
-    fn add_assign(&mut self, other: Size) {
-        *self = *self + other;
-    }
-}
-
-impl Step for Size {
-    #[inline]
-    fn steps_between(start: &Self, end: &Self) -> Option<usize> {
-        u64::steps_between(&start.bytes(), &end.bytes())
-    }
-
-    #[inline]
-    fn forward_checked(start: Self, count: usize) -> Option<Self> {
-        u64::forward_checked(start.bytes(), count).map(Self::from_bytes)
-    }
-
-    #[inline]
-    fn forward(start: Self, count: usize) -> Self {
-        Self::from_bytes(u64::forward(start.bytes(), count))
-    }
-
-    #[inline]
-    unsafe fn forward_unchecked(start: Self, count: usize) -> Self {
-        Self::from_bytes(u64::forward_unchecked(start.bytes(), count))
-    }
-
-    #[inline]
-    fn backward_checked(start: Self, count: usize) -> Option<Self> {
-        u64::backward_checked(start.bytes(), count).map(Self::from_bytes)
-    }
-
-    #[inline]
-    fn backward(start: Self, count: usize) -> Self {
-        Self::from_bytes(u64::backward(start.bytes(), count))
-    }
-
-    #[inline]
-    unsafe fn backward_unchecked(start: Self, count: usize) -> Self {
-        Self::from_bytes(u64::backward_unchecked(start.bytes(), count))
-    }
-}
-
-/// Alignment of a type in bytes (always a power of two).
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Encodable, Decodable)]
-#[derive(HashStable_Generic)]
-pub struct Align {
-    pow2: u8,
-}
-
-// This is debug-printed a lot in larger structs, don't waste too much space there
-impl fmt::Debug for Align {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "Align({} bytes)", self.bytes())
-    }
-}
-
-impl Align {
-    pub const ONE: Align = Align { pow2: 0 };
-    pub const MAX: Align = Align { pow2: 29 };
-
-    #[inline]
-    pub fn from_bits(bits: u64) -> Result<Align, String> {
-        Align::from_bytes(Size::from_bits(bits).bytes())
-    }
-
-    #[inline]
-    pub fn from_bytes(align: u64) -> Result<Align, String> {
-        // Treat an alignment of 0 bytes like 1-byte alignment.
-        if align == 0 {
-            return Ok(Align::ONE);
-        }
-
-        #[cold]
-        fn not_power_of_2(align: u64) -> String {
-            format!("`{}` is not a power of 2", align)
-        }
-
-        #[cold]
-        fn too_large(align: u64) -> String {
-            format!("`{}` is too large", align)
-        }
-
-        let mut bytes = align;
-        let mut pow2: u8 = 0;
-        while (bytes & 1) == 0 {
-            pow2 += 1;
-            bytes >>= 1;
-        }
-        if bytes != 1 {
-            return Err(not_power_of_2(align));
-        }
-        if pow2 > Self::MAX.pow2 {
-            return Err(too_large(align));
-        }
-
-        Ok(Align { pow2 })
-    }
-
-    #[inline]
-    pub fn bytes(self) -> u64 {
-        1 << self.pow2
-    }
-
-    #[inline]
-    pub fn bits(self) -> u64 {
-        self.bytes() * 8
-    }
-
-    /// Computes the best alignment possible for the given offset
-    /// (the largest power of two that the offset is a multiple of).
-    ///
-    /// N.B., for an offset of `0`, this happens to return `2^64`.
-    #[inline]
-    pub fn max_for_offset(offset: Size) -> Align {
-        Align { pow2: offset.bytes().trailing_zeros() as u8 }
-    }
-
-    /// Lower the alignment, if necessary, such that the given offset
-    /// is aligned to it (the offset is a multiple of the alignment).
-    #[inline]
-    pub fn restrict_for_offset(self, offset: Size) -> Align {
-        self.min(Align::max_for_offset(offset))
-    }
-}
-
-/// A pair of alignments, ABI-mandated and preferred.
-#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
-#[derive(HashStable_Generic)]
-pub struct AbiAndPrefAlign {
-    pub abi: Align,
-    pub pref: Align,
-}
-
-impl AbiAndPrefAlign {
-    #[inline]
-    pub fn new(align: Align) -> AbiAndPrefAlign {
-        AbiAndPrefAlign { abi: align, pref: align }
-    }
-
-    #[inline]
-    pub fn min(self, other: AbiAndPrefAlign) -> AbiAndPrefAlign {
-        AbiAndPrefAlign { abi: self.abi.min(other.abi), pref: self.pref.min(other.pref) }
-    }
-
-    #[inline]
-    pub fn max(self, other: AbiAndPrefAlign) -> AbiAndPrefAlign {
-        AbiAndPrefAlign { abi: self.abi.max(other.abi), pref: self.pref.max(other.pref) }
-    }
-}
-
-/// Integers, also used for enum discriminants.
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, HashStable_Generic)]
-pub enum Integer {
-    I8,
-    I16,
-    I32,
-    I64,
-    I128,
-}
-
-impl Integer {
-    #[inline]
-    pub fn size(self) -> Size {
-        match self {
-            I8 => Size::from_bytes(1),
-            I16 => Size::from_bytes(2),
-            I32 => Size::from_bytes(4),
-            I64 => Size::from_bytes(8),
-            I128 => Size::from_bytes(16),
-        }
-    }
-
-    pub fn align<C: HasDataLayout>(self, cx: &C) -> AbiAndPrefAlign {
-        let dl = cx.data_layout();
-
-        match self {
-            I8 => dl.i8_align,
-            I16 => dl.i16_align,
-            I32 => dl.i32_align,
-            I64 => dl.i64_align,
-            I128 => dl.i128_align,
-        }
-    }
-
-    /// Finds the smallest Integer type which can represent the signed value.
-    #[inline]
-    pub fn fit_signed(x: i128) -> Integer {
-        match x {
-            -0x0000_0000_0000_0080..=0x0000_0000_0000_007f => I8,
-            -0x0000_0000_0000_8000..=0x0000_0000_0000_7fff => I16,
-            -0x0000_0000_8000_0000..=0x0000_0000_7fff_ffff => I32,
-            -0x8000_0000_0000_0000..=0x7fff_ffff_ffff_ffff => I64,
-            _ => I128,
-        }
-    }
-
-    /// Finds the smallest Integer type which can represent the unsigned value.
-    #[inline]
-    pub fn fit_unsigned(x: u128) -> Integer {
-        match x {
-            0..=0x0000_0000_0000_00ff => I8,
-            0..=0x0000_0000_0000_ffff => I16,
-            0..=0x0000_0000_ffff_ffff => I32,
-            0..=0xffff_ffff_ffff_ffff => I64,
-            _ => I128,
-        }
-    }
-
-    /// Finds the smallest integer with the given alignment.
-    pub fn for_align<C: HasDataLayout>(cx: &C, wanted: Align) -> Option<Integer> {
-        let dl = cx.data_layout();
-
-        for candidate in [I8, I16, I32, I64, I128] {
-            if wanted == candidate.align(dl).abi && wanted.bytes() == candidate.size().bytes() {
-                return Some(candidate);
-            }
-        }
-        None
-    }
-
-    /// Find the largest integer with the given alignment or less.
-    pub fn approximate_align<C: HasDataLayout>(cx: &C, wanted: Align) -> Integer {
-        let dl = cx.data_layout();
-
-        // FIXME(eddyb) maybe include I128 in the future, when it works everywhere.
-        for candidate in [I64, I32, I16] {
-            if wanted >= candidate.align(dl).abi && wanted.bytes() >= candidate.size().bytes() {
-                return candidate;
-            }
-        }
-        I8
-    }
-
-    // FIXME(eddyb) consolidate this and other methods that find the appropriate
-    // `Integer` given some requirements.
-    #[inline]
-    fn from_size(size: Size) -> Result<Self, String> {
-        match size.bits() {
-            8 => Ok(Integer::I8),
-            16 => Ok(Integer::I16),
-            32 => Ok(Integer::I32),
-            64 => Ok(Integer::I64),
-            128 => Ok(Integer::I128),
-            _ => Err(format!("rust does not support integers with {} bits", size.bits())),
-        }
-    }
-}
-
-/// Fundamental unit of memory access and layout.
-#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, HashStable_Generic)]
-pub enum Primitive {
-    /// The `bool` is the signedness of the `Integer` type.
-    ///
-    /// One would think we would not care about such details this low down,
-    /// but some ABIs are described in terms of C types and ISAs where the
-    /// integer arithmetic is done on {sign,zero}-extended registers, e.g.
-    /// a negative integer passed by zero-extension will appear positive in
-    /// the callee, and most operations on it will produce the wrong values.
-    Int(Integer, bool),
-    F32,
-    F64,
-    Pointer,
-}
-
-impl Primitive {
-    pub fn size<C: HasDataLayout>(self, cx: &C) -> Size {
-        let dl = cx.data_layout();
-
-        match self {
-            Int(i, _) => i.size(),
-            F32 => Size::from_bits(32),
-            F64 => Size::from_bits(64),
-            Pointer => dl.pointer_size,
-        }
-    }
-
-    pub fn align<C: HasDataLayout>(self, cx: &C) -> AbiAndPrefAlign {
-        let dl = cx.data_layout();
-
-        match self {
-            Int(i, _) => i.align(dl),
-            F32 => dl.f32_align,
-            F64 => dl.f64_align,
-            Pointer => dl.pointer_align,
-        }
-    }
-
-    // FIXME(eddyb) remove, it's trivial thanks to `matches!`.
-    #[inline]
-    pub fn is_float(self) -> bool {
-        matches!(self, F32 | F64)
-    }
-
-    // FIXME(eddyb) remove, it's completely unused.
-    #[inline]
-    pub fn is_int(self) -> bool {
-        matches!(self, Int(..))
-    }
-
-    #[inline]
-    pub fn is_ptr(self) -> bool {
-        matches!(self, Pointer)
-    }
-}
-
-/// Inclusive wrap-around range of valid values, that is, if
-/// start > end, it represents `start..=MAX`,
-/// followed by `0..=end`.
-///
-/// That is, for an i8 primitive, a range of `254..=2` means following
-/// sequence:
-///
-///    254 (-2), 255 (-1), 0, 1, 2
-///
-/// This is intended specifically to mirror LLVM’s `!range` metadata semantics.
-#[derive(Clone, Copy, PartialEq, Eq, Hash)]
-#[derive(HashStable_Generic)]
-pub struct WrappingRange {
-    pub start: u128,
-    pub end: u128,
-}
-
-impl WrappingRange {
-    pub fn full(size: Size) -> Self {
-        Self { start: 0, end: size.unsigned_int_max() }
-    }
-
-    /// Returns `true` if `v` is contained in the range.
-    #[inline(always)]
-    pub fn contains(&self, v: u128) -> bool {
-        if self.start <= self.end {
-            self.start <= v && v <= self.end
-        } else {
-            self.start <= v || v <= self.end
-        }
-    }
-
-    /// Returns `self` with replaced `start`
-    #[inline(always)]
-    pub fn with_start(mut self, start: u128) -> Self {
-        self.start = start;
-        self
-    }
-
-    /// Returns `self` with replaced `end`
-    #[inline(always)]
-    pub fn with_end(mut self, end: u128) -> Self {
-        self.end = end;
-        self
-    }
-
-    /// Returns `true` if `size` completely fills the range.
-    #[inline]
-    pub fn is_full_for(&self, size: Size) -> bool {
-        let max_value = size.unsigned_int_max();
-        debug_assert!(self.start <= max_value && self.end <= max_value);
-        self.start == (self.end.wrapping_add(1) & max_value)
-    }
-}
-
-impl fmt::Debug for WrappingRange {
-    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
-        if self.start > self.end {
-            write!(fmt, "(..={}) | ({}..)", self.end, self.start)?;
-        } else {
-            write!(fmt, "{}..={}", self.start, self.end)?;
-        }
-        Ok(())
-    }
-}
-
-/// Information about one scalar component of a Rust type.
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
-#[derive(HashStable_Generic)]
-pub enum Scalar {
-    Initialized {
-        value: Primitive,
-
-        // FIXME(eddyb) always use the shortest range, e.g., by finding
-        // the largest space between two consecutive valid values and
-        // taking everything else as the (shortest) valid range.
-        valid_range: WrappingRange,
-    },
-    Union {
-        /// Even for unions, we need to use the correct registers for the kind of
-        /// values inside the union, so we keep the `Primitive` type around. We
-        /// also use it to compute the size of the scalar.
-        /// However, unions never have niches and even allow undef,
-        /// so there is no `valid_range`.
-        value: Primitive,
-    },
-}
-
-impl Scalar {
-    #[inline]
-    pub fn is_bool(&self) -> bool {
-        matches!(
-            self,
-            Scalar::Initialized {
-                value: Int(I8, false),
-                valid_range: WrappingRange { start: 0, end: 1 }
-            }
-        )
-    }
-
-    /// Get the primitive representation of this type, ignoring the valid range and whether the
-    /// value is allowed to be undefined (due to being a union).
-    pub fn primitive(&self) -> Primitive {
-        match *self {
-            Scalar::Initialized { value, .. } | Scalar::Union { value } => value,
-        }
-    }
-
-    pub fn align(self, cx: &impl HasDataLayout) -> AbiAndPrefAlign {
-        self.primitive().align(cx)
-    }
-
-    pub fn size(self, cx: &impl HasDataLayout) -> Size {
-        self.primitive().size(cx)
-    }
-
-    #[inline]
-    pub fn to_union(&self) -> Self {
-        Self::Union { value: self.primitive() }
-    }
-
-    #[inline]
-    pub fn valid_range(&self, cx: &impl HasDataLayout) -> WrappingRange {
-        match *self {
-            Scalar::Initialized { valid_range, .. } => valid_range,
-            Scalar::Union { value } => WrappingRange::full(value.size(cx)),
-        }
-    }
-
-    #[inline]
-    /// Allows the caller to mutate the valid range. This operation will panic if attempted on a union.
-    pub fn valid_range_mut(&mut self) -> &mut WrappingRange {
-        match self {
-            Scalar::Initialized { valid_range, .. } => valid_range,
-            Scalar::Union { .. } => panic!("cannot change the valid range of a union"),
-        }
-    }
-
-    /// Returns `true` if all possible numbers are valid, i.e `valid_range` covers the whole layout
-    #[inline]
-    pub fn is_always_valid<C: HasDataLayout>(&self, cx: &C) -> bool {
-        match *self {
-            Scalar::Initialized { valid_range, .. } => valid_range.is_full_for(self.size(cx)),
-            Scalar::Union { .. } => true,
-        }
-    }
-
-    /// Returns `true` if this type can be left uninit.
-    #[inline]
-    pub fn is_uninit_valid(&self) -> bool {
-        match *self {
-            Scalar::Initialized { .. } => false,
-            Scalar::Union { .. } => true,
-        }
-    }
-}
-
-/// Describes how the fields of a type are located in memory.
-#[derive(PartialEq, Eq, Hash, Debug, HashStable_Generic)]
-pub enum FieldsShape {
-    /// Scalar primitives and `!`, which never have fields.
-    Primitive,
-
-    /// All fields start at no offset. The `usize` is the field count.
-    Union(NonZeroUsize),
-
-    /// Array/vector-like placement, with all fields of identical types.
-    Array { stride: Size, count: u64 },
-
-    /// Struct-like placement, with precomputed offsets.
-    ///
-    /// Fields are guaranteed to not overlap, but note that gaps
-    /// before, between and after all the fields are NOT always
-    /// padding, and as such their contents may not be discarded.
-    /// For example, enum variants leave a gap at the start,
-    /// where the discriminant field in the enum layout goes.
-    Arbitrary {
-        /// Offsets for the first byte of each field,
-        /// ordered to match the source definition order.
-        /// This vector does not go in increasing order.
-        // FIXME(eddyb) use small vector optimization for the common case.
-        offsets: Vec<Size>,
-
-        /// Maps source order field indices to memory order indices,
-        /// depending on how the fields were reordered (if at all).
-        /// This is a permutation, with both the source order and the
-        /// memory order using the same (0..n) index ranges.
-        ///
-        /// Note that during computation of `memory_index`, sometimes
-        /// it is easier to operate on the inverse mapping (that is,
-        /// from memory order to source order), and that is usually
-        /// named `inverse_memory_index`.
-        ///
-        // FIXME(eddyb) build a better abstraction for permutations, if possible.
-        // FIXME(camlorn) also consider small vector  optimization here.
-        memory_index: Vec<u32>,
-    },
-}
-
-impl FieldsShape {
-    #[inline]
-    pub fn count(&self) -> usize {
-        match *self {
-            FieldsShape::Primitive => 0,
-            FieldsShape::Union(count) => count.get(),
-            FieldsShape::Array { count, .. } => count.try_into().unwrap(),
-            FieldsShape::Arbitrary { ref offsets, .. } => offsets.len(),
-        }
-    }
-
-    #[inline]
-    pub fn offset(&self, i: usize) -> Size {
-        match *self {
-            FieldsShape::Primitive => {
-                unreachable!("FieldsShape::offset: `Primitive`s have no fields")
-            }
-            FieldsShape::Union(count) => {
-                assert!(
-                    i < count.get(),
-                    "tried to access field {} of union with {} fields",
-                    i,
-                    count
-                );
-                Size::ZERO
-            }
-            FieldsShape::Array { stride, count } => {
-                let i = u64::try_from(i).unwrap();
-                assert!(i < count);
-                stride * i
-            }
-            FieldsShape::Arbitrary { ref offsets, .. } => offsets[i],
-        }
-    }
-
-    #[inline]
-    pub fn memory_index(&self, i: usize) -> usize {
-        match *self {
-            FieldsShape::Primitive => {
-                unreachable!("FieldsShape::memory_index: `Primitive`s have no fields")
-            }
-            FieldsShape::Union(_) | FieldsShape::Array { .. } => i,
-            FieldsShape::Arbitrary { ref memory_index, .. } => memory_index[i].try_into().unwrap(),
-        }
-    }
-
-    /// Gets source indices of the fields by increasing offsets.
-    #[inline]
-    pub fn index_by_increasing_offset<'a>(&'a self) -> impl Iterator<Item = usize> + 'a {
-        let mut inverse_small = [0u8; 64];
-        let mut inverse_big = vec![];
-        let use_small = self.count() <= inverse_small.len();
-
-        // We have to write this logic twice in order to keep the array small.
-        if let FieldsShape::Arbitrary { ref memory_index, .. } = *self {
-            if use_small {
-                for i in 0..self.count() {
-                    inverse_small[memory_index[i] as usize] = i as u8;
-                }
-            } else {
-                inverse_big = vec![0; self.count()];
-                for i in 0..self.count() {
-                    inverse_big[memory_index[i] as usize] = i as u32;
-                }
-            }
-        }
-
-        (0..self.count()).map(move |i| match *self {
-            FieldsShape::Primitive | FieldsShape::Union(_) | FieldsShape::Array { .. } => i,
-            FieldsShape::Arbitrary { .. } => {
-                if use_small {
-                    inverse_small[i] as usize
-                } else {
-                    inverse_big[i] as usize
-                }
-            }
-        })
-    }
-}
-
-/// An identifier that specifies the address space that some operation
-/// should operate on. Special address spaces have an effect on code generation,
-/// depending on the target and the address spaces it implements.
-#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
-pub struct AddressSpace(pub u32);
-
-impl AddressSpace {
-    /// The default address space, corresponding to data space.
-    pub const DATA: Self = AddressSpace(0);
-}
-
-/// Describes how values of the type are passed by target ABIs,
-/// in terms of categories of C types there are ABI rules for.
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, HashStable_Generic)]
-pub enum Abi {
-    Uninhabited,
-    Scalar(Scalar),
-    ScalarPair(Scalar, Scalar),
-    Vector {
-        element: Scalar,
-        count: u64,
-    },
-    Aggregate {
-        /// If true, the size is exact, otherwise it's only a lower bound.
-        sized: bool,
-    },
-}
-
-impl Abi {
-    /// Returns `true` if the layout corresponds to an unsized type.
-    #[inline]
-    pub fn is_unsized(&self) -> bool {
-        match *self {
-            Abi::Uninhabited | Abi::Scalar(_) | Abi::ScalarPair(..) | Abi::Vector { .. } => false,
-            Abi::Aggregate { sized } => !sized,
-        }
-    }
-
-    /// Returns `true` if this is a single signed integer scalar
-    #[inline]
-    pub fn is_signed(&self) -> bool {
-        match self {
-            Abi::Scalar(scal) => match scal.primitive() {
-                Primitive::Int(_, signed) => signed,
-                _ => false,
-            },
-            _ => panic!("`is_signed` on non-scalar ABI {:?}", self),
-        }
-    }
-
-    /// Returns `true` if this is an uninhabited type
-    #[inline]
-    pub fn is_uninhabited(&self) -> bool {
-        matches!(*self, Abi::Uninhabited)
-    }
-
-    /// Returns `true` is this is a scalar type
-    #[inline]
-    pub fn is_scalar(&self) -> bool {
-        matches!(*self, Abi::Scalar(_))
-    }
-}
-
 rustc_index::newtype_index! {
     pub struct VariantIdx {
         derive [HashStable_Generic]
     }
 }
 
-#[derive(PartialEq, Eq, Hash, Debug, HashStable_Generic)]
-pub enum Variants<'a> {
-    /// Single enum variants, structs/tuples, unions, and all non-ADTs.
-    Single { index: VariantIdx },
-
-    /// Enum-likes with more than one inhabited variant: each variant comes with
-    /// a *discriminant* (usually the same as the variant index but the user can
-    /// assign explicit discriminant values).  That discriminant is encoded
-    /// as a *tag* on the machine.  The layout of each variant is
-    /// a struct, and they all have space reserved for the tag.
-    /// For enums, the tag is the sole field of the layout.
-    Multiple {
-        tag: Scalar,
-        tag_encoding: TagEncoding,
-        tag_field: usize,
-        variants: IndexVec<VariantIdx, Layout<'a>>,
-    },
-}
-
-#[derive(PartialEq, Eq, Hash, Debug, HashStable_Generic)]
-pub enum TagEncoding {
-    /// The tag directly stores the discriminant, but possibly with a smaller layout
-    /// (so converting the tag to the discriminant can require sign extension).
-    Direct,
-
-    /// Niche (values invalid for a type) encoding the discriminant:
-    /// Discriminant and variant index coincide.
-    /// The variant `untagged_variant` contains a niche at an arbitrary
-    /// offset (field `tag_field` of the enum), which for a variant with
-    /// discriminant `d` is set to
-    /// `(d - niche_variants.start).wrapping_add(niche_start)`.
-    ///
-    /// For example, `Option<(usize, &T)>`  is represented such that
-    /// `None` has a null pointer for the second tuple field, and
-    /// `Some` is the identity function (with a non-null reference).
-    Niche {
-        untagged_variant: VariantIdx,
-        niche_variants: RangeInclusive<VariantIdx>,
-        niche_start: u128,
-    },
-}
-
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, HashStable_Generic)]
-pub struct Niche {
-    pub offset: Size,
-    pub value: Primitive,
-    pub valid_range: WrappingRange,
-}
-
-impl Niche {
-    pub fn from_scalar<C: HasDataLayout>(cx: &C, offset: Size, scalar: Scalar) -> Option<Self> {
-        let Scalar::Initialized { value, valid_range } = scalar else { return None };
-        let niche = Niche { offset, value, valid_range };
-        if niche.available(cx) > 0 { Some(niche) } else { None }
-    }
-
-    pub fn available<C: HasDataLayout>(&self, cx: &C) -> u128 {
-        let Self { value, valid_range: v, .. } = *self;
-        let size = value.size(cx);
-        assert!(size.bits() <= 128);
-        let max_value = size.unsigned_int_max();
-
-        // Find out how many values are outside the valid range.
-        let niche = v.end.wrapping_add(1)..v.start;
-        niche.end.wrapping_sub(niche.start) & max_value
-    }
-
-    pub fn reserve<C: HasDataLayout>(&self, cx: &C, count: u128) -> Option<(u128, Scalar)> {
-        assert!(count > 0);
-
-        let Self { value, valid_range: v, .. } = *self;
-        let size = value.size(cx);
-        assert!(size.bits() <= 128);
-        let max_value = size.unsigned_int_max();
-
-        let niche = v.end.wrapping_add(1)..v.start;
-        let available = niche.end.wrapping_sub(niche.start) & max_value;
-        if count > available {
-            return None;
-        }
-
-        // Extend the range of valid values being reserved by moving either `v.start` or `v.end` bound.
-        // Given an eventual `Option<T>`, we try to maximize the chance for `None` to occupy the niche of zero.
-        // This is accomplished by preferring enums with 2 variants(`count==1`) and always taking the shortest path to niche zero.
-        // Having `None` in niche zero can enable some special optimizations.
-        //
-        // Bound selection criteria:
-        // 1. Select closest to zero given wrapping semantics.
-        // 2. Avoid moving past zero if possible.
-        //
-        // In practice this means that enums with `count > 1` are unlikely to claim niche zero, since they have to fit perfectly.
-        // If niche zero is already reserved, the selection of bounds are of little interest.
-        let move_start = |v: WrappingRange| {
-            let start = v.start.wrapping_sub(count) & max_value;
-            Some((start, Scalar::Initialized { value, valid_range: v.with_start(start) }))
-        };
-        let move_end = |v: WrappingRange| {
-            let start = v.end.wrapping_add(1) & max_value;
-            let end = v.end.wrapping_add(count) & max_value;
-            Some((start, Scalar::Initialized { value, valid_range: v.with_end(end) }))
-        };
-        let distance_end_zero = max_value - v.end;
-        if v.start > v.end {
-            // zero is unavailable because wrapping occurs
-            move_end(v)
-        } else if v.start <= distance_end_zero {
-            if count <= v.start {
-                move_start(v)
-            } else {
-                // moved past zero, use other bound
-                move_end(v)
-            }
-        } else {
-            let end = v.end.wrapping_add(count) & max_value;
-            let overshot_zero = (1..=v.end).contains(&end);
-            if overshot_zero {
-                // moved past zero, use other bound
-                move_start(v)
-            } else {
-                move_end(v)
-            }
-        }
-    }
-}
-
-#[derive(PartialEq, Eq, Hash, HashStable_Generic)]
-pub struct LayoutS<'a> {
-    /// Says where the fields are located within the layout.
-    pub fields: FieldsShape,
-
-    /// Encodes information about multi-variant layouts.
-    /// Even with `Multiple` variants, a layout still has its own fields! Those are then
-    /// shared between all variants. One of them will be the discriminant,
-    /// but e.g. generators can have more.
-    ///
-    /// To access all fields of this layout, both `fields` and the fields of the active variant
-    /// must be taken into account.
-    pub variants: Variants<'a>,
-
-    /// The `abi` defines how this data is passed between functions, and it defines
-    /// value restrictions via `valid_range`.
-    ///
-    /// Note that this is entirely orthogonal to the recursive structure defined by
-    /// `variants` and `fields`; for example, `ManuallyDrop<Result<isize, isize>>` has
-    /// `Abi::ScalarPair`! So, even with non-`Aggregate` `abi`, `fields` and `variants`
-    /// have to be taken into account to find all fields of this layout.
-    pub abi: Abi,
-
-    /// The leaf scalar with the largest number of invalid values
-    /// (i.e. outside of its `valid_range`), if it exists.
-    pub largest_niche: Option<Niche>,
-
-    pub align: AbiAndPrefAlign,
-    pub size: Size,
-}
-
-impl<'a> LayoutS<'a> {
-    pub fn scalar<C: HasDataLayout>(cx: &C, scalar: Scalar) -> Self {
-        let largest_niche = Niche::from_scalar(cx, Size::ZERO, scalar);
-        let size = scalar.size(cx);
-        let align = scalar.align(cx);
-        LayoutS {
-            variants: Variants::Single { index: VariantIdx::new(0) },
-            fields: FieldsShape::Primitive,
-            abi: Abi::Scalar(scalar),
-            largest_niche,
-            size,
-            align,
-        }
-    }
-}
-
-impl<'a> fmt::Debug for LayoutS<'a> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        // This is how `Layout` used to print before it become
-        // `Interned<LayoutS>`. We print it like this to avoid having to update
-        // expected output in a lot of tests.
-        let LayoutS { size, align, abi, fields, largest_niche, variants } = self;
-        f.debug_struct("Layout")
-            .field("size", size)
-            .field("align", align)
-            .field("abi", abi)
-            .field("fields", fields)
-            .field("largest_niche", largest_niche)
-            .field("variants", variants)
-            .finish()
-    }
-}
-
 #[derive(Copy, Clone, PartialEq, Eq, Hash, HashStable_Generic)]
 #[rustc_pass_by_value]
-pub struct Layout<'a>(pub Interned<'a, LayoutS<'a>>);
+pub struct Layout<'a>(pub Interned<'a, LayoutS<VariantIdx>>);
 
 impl<'a> fmt::Debug for Layout<'a> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -1319,7 +41,7 @@ impl<'a> Layout<'a> {
         &self.0.0.fields
     }
 
-    pub fn variants(self) -> &'a Variants<'a> {
+    pub fn variants(self) -> &'a Variants<VariantIdx> {
         &self.0.0.variants
     }
 
@@ -1354,47 +76,12 @@ pub struct TyAndLayout<'a, Ty> {
 }
 
 impl<'a, Ty> Deref for TyAndLayout<'a, Ty> {
-    type Target = &'a LayoutS<'a>;
-    fn deref(&self) -> &&'a LayoutS<'a> {
+    type Target = &'a LayoutS<VariantIdx>;
+    fn deref(&self) -> &&'a LayoutS<VariantIdx> {
         &self.layout.0.0
     }
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, Debug)]
-pub enum PointerKind {
-    /// Most general case, we know no restrictions to tell LLVM.
-    SharedMutable,
-
-    /// `&T` where `T` contains no `UnsafeCell`, is `dereferenceable`, `noalias` and `readonly`.
-    Frozen,
-
-    /// `&mut T` which is `dereferenceable` and `noalias` but not `readonly`.
-    UniqueBorrowed,
-
-    /// `&mut !Unpin`, which is `dereferenceable` but neither `noalias` nor `readonly`.
-    UniqueBorrowedPinned,
-
-    /// `Box<T>`, which is `noalias` (even on return types, unlike the above) but neither `readonly`
-    /// nor `dereferenceable`.
-    UniqueOwned,
-}
-
-#[derive(Copy, Clone, Debug)]
-pub struct PointeeInfo {
-    pub size: Size,
-    pub align: Align,
-    pub safe: Option<PointerKind>,
-    pub address_space: AddressSpace,
-}
-
-/// Used in `might_permit_raw_init` to indicate the kind of initialisation
-/// that is checked to be valid
-#[derive(Copy, Clone, Debug, PartialEq, Eq)]
-pub enum InitKind {
-    Zero,
-    UninitMitigated0x01Fill,
-}
-
 /// Trait that needs to be implemented by the higher-level type representation
 /// (e.g. `rustc_middle::ty::Ty`), to provide `rustc_target::abi` functionality.
 pub trait TyAbiInterface<'a, C>: Sized {
@@ -1490,6 +177,11 @@ impl<'a, Ty> TyAndLayout<'a, Ty> {
         self.abi.is_unsized()
     }
 
+    #[inline]
+    pub fn is_sized(&self) -> bool {
+        self.abi.is_sized()
+    }
+
     /// Returns `true` if the type is a ZST and not unsized.
     pub fn is_zst(&self) -> bool {
         match self.abi {
diff --git a/compiler/rustc_target/src/json.rs b/compiler/rustc_target/src/json.rs
index b5d926352..75bb76a9d 100644
--- a/compiler/rustc_target/src/json.rs
+++ b/compiler/rustc_target/src/json.rs
@@ -89,3 +89,28 @@ impl<A: ToJson> ToJson for Option<A> {
         }
     }
 }
+
+impl ToJson for crate::abi::call::Conv {
+    fn to_json(&self) -> Json {
+        let s = match self {
+            Self::C => "C",
+            Self::Rust => "Rust",
+            Self::RustCold => "RustCold",
+            Self::ArmAapcs => "ArmAapcs",
+            Self::CCmseNonSecureCall => "CCmseNonSecureCall",
+            Self::Msp430Intr => "Msp430Intr",
+            Self::PtxKernel => "PtxKernel",
+            Self::X86Fastcall => "X86Fastcall",
+            Self::X86Intr => "X86Intr",
+            Self::X86Stdcall => "X86Stdcall",
+            Self::X86ThisCall => "X86ThisCall",
+            Self::X86VectorCall => "X86VectorCall",
+            Self::X86_64SysV => "X86_64SysV",
+            Self::X86_64Win64 => "X86_64Win64",
+            Self::AmdGpuKernel => "AmdGpuKernel",
+            Self::AvrInterrupt => "AvrInterrupt",
+            Self::AvrNonBlockingInterrupt => "AvrNonBlockingInterrupt",
+        };
+        Json::String(s.to_owned())
+    }
+}
diff --git a/compiler/rustc_target/src/lib.rs b/compiler/rustc_target/src/lib.rs
index aaba0d7f0..b69a0a645 100644
--- a/compiler/rustc_target/src/lib.rs
+++ b/compiler/rustc_target/src/lib.rs
@@ -35,10 +35,7 @@ pub mod spec;
 #[cfg(test)]
 mod tests;
 
-/// Requirements for a `StableHashingContext` to be used in this crate.
-/// This is a hack to allow using the `HashStable_Generic` derive macro
-/// instead of implementing everything in `rustc_middle`.
-pub trait HashStableContext {}
+pub use rustc_abi::HashStableContext;
 
 /// The name of rustc's own place to organize libraries.
 ///
diff --git a/compiler/rustc_target/src/spec/aarch64_apple_darwin.rs b/compiler/rustc_target/src/spec/aarch64_apple_darwin.rs
index 6d919a4c2..e72cab629 100644
--- a/compiler/rustc_target/src/spec/aarch64_apple_darwin.rs
+++ b/compiler/rustc_target/src/spec/aarch64_apple_darwin.rs
@@ -1,26 +1,23 @@
+use super::apple_base::{macos_llvm_target, opts, Arch};
 use crate::spec::{FramePointer, SanitizerSet, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let arch = "arm64";
-    let mut base = super::apple_base::opts("macos", arch, "");
+    let arch = Arch::Arm64;
+    let mut base = opts("macos", arch);
     base.cpu = "apple-a14".into();
     base.max_atomic_width = Some(128);
 
     // FIXME: The leak sanitizer currently fails the tests, see #88132.
     base.supported_sanitizers = SanitizerSet::ADDRESS | SanitizerSet::CFI | SanitizerSet::THREAD;
 
-    base.link_env_remove.to_mut().extend(super::apple_base::macos_link_env_remove());
-
-    // Clang automatically chooses a more specific target based on
-    // MACOSX_DEPLOYMENT_TARGET.  To enable cross-language LTO to work
-    // correctly, we do too.
-    let llvm_target = super::apple_base::macos_llvm_target(arch);
-
     Target {
-        llvm_target: llvm_target.into(),
+        // Clang automatically chooses a more specific target based on
+        // MACOSX_DEPLOYMENT_TARGET.  To enable cross-language LTO to work
+        // correctly, we do too.
+        llvm_target: macos_llvm_target(arch).into(),
         pointer_width: 64,
         data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
-        arch: "aarch64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             mcount: "\u{1}mcount".into(),
             frame_pointer: FramePointer::NonLeaf,
diff --git a/compiler/rustc_target/src/spec/aarch64_apple_ios.rs b/compiler/rustc_target/src/spec/aarch64_apple_ios.rs
index beb904239..b5f9eb125 100644
--- a/compiler/rustc_target/src/spec/aarch64_apple_ios.rs
+++ b/compiler/rustc_target/src/spec/aarch64_apple_ios.rs
@@ -1,19 +1,17 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{ios_llvm_target, opts, Arch};
 use crate::spec::{FramePointer, Target, TargetOptions};
 
 pub fn target() -> Target {
-    // Clang automatically chooses a more specific target based on
-    // IPHONEOS_DEPLOYMENT_TARGET.
-    // This is required for the target to pick the right
-    // MACH-O commands, so we do too.
-    let arch = "arm64";
-    let llvm_target = super::apple_base::ios_llvm_target(arch);
-
+    let arch = Arch::Arm64;
     Target {
-        llvm_target: llvm_target.into(),
+        // Clang automatically chooses a more specific target based on
+        // IPHONEOS_DEPLOYMENT_TARGET.
+        // This is required for the target to pick the right
+        // MACH-O commands, so we do too.
+        llvm_target: ios_llvm_target(arch).into(),
         pointer_width: 64,
         data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
-        arch: "aarch64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             features: "+neon,+fp-armv8,+apple-a7".into(),
             max_atomic_width: Some(128),
@@ -30,7 +28,7 @@ pub fn target() -> Target {
                 darwinpcs\0\
                 -Os\0"
                 .into(),
-            ..opts("ios", Arch::Arm64)
+            ..opts("ios", arch)
         },
     }
 }
diff --git a/compiler/rustc_target/src/spec/aarch64_apple_ios_macabi.rs b/compiler/rustc_target/src/spec/aarch64_apple_ios_macabi.rs
index 2d2671549..0009972cf 100644
--- a/compiler/rustc_target/src/spec/aarch64_apple_ios_macabi.rs
+++ b/compiler/rustc_target/src/spec/aarch64_apple_ios_macabi.rs
@@ -1,17 +1,18 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{opts, Arch};
 use crate::spec::{Cc, FramePointer, LinkerFlavor, Lld, Target, TargetOptions};
 
 pub fn target() -> Target {
     let llvm_target = "arm64-apple-ios14.0-macabi";
 
-    let mut base = opts("ios", Arch::Arm64_macabi);
+    let arch = Arch::Arm64_macabi;
+    let mut base = opts("ios", arch);
     base.add_pre_link_args(LinkerFlavor::Darwin(Cc::Yes, Lld::No), &["-target", llvm_target]);
 
     Target {
         llvm_target: llvm_target.into(),
         pointer_width: 64,
         data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
-        arch: "aarch64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             features: "+neon,+fp-armv8,+apple-a12".into(),
             max_atomic_width: Some(128),
diff --git a/compiler/rustc_target/src/spec/aarch64_apple_ios_sim.rs b/compiler/rustc_target/src/spec/aarch64_apple_ios_sim.rs
index b4e135f66..3374755e2 100644
--- a/compiler/rustc_target/src/spec/aarch64_apple_ios_sim.rs
+++ b/compiler/rustc_target/src/spec/aarch64_apple_ios_sim.rs
@@ -1,21 +1,17 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{ios_sim_llvm_target, opts, Arch};
 use crate::spec::{FramePointer, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let base = opts("ios", Arch::Arm64_sim);
-
-    // Clang automatically chooses a more specific target based on
-    // IPHONEOS_DEPLOYMENT_TARGET.
-    // This is required for the simulator target to pick the right
-    // MACH-O commands, so we do too.
-    let arch = "arm64";
-    let llvm_target = super::apple_base::ios_sim_llvm_target(arch);
-
+    let arch = Arch::Arm64_sim;
     Target {
-        llvm_target: llvm_target.into(),
+        // Clang automatically chooses a more specific target based on
+        // IPHONEOS_DEPLOYMENT_TARGET.
+        // This is required for the simulator target to pick the right
+        // MACH-O commands, so we do too.
+        llvm_target: ios_sim_llvm_target(arch).into(),
         pointer_width: 64,
         data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
-        arch: "aarch64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             features: "+neon,+fp-armv8,+apple-a7".into(),
             max_atomic_width: Some(128),
@@ -32,7 +28,7 @@ pub fn target() -> Target {
                 darwinpcs\0\
                 -Os\0"
                 .into(),
-            ..base
+            ..opts("ios", arch)
         },
     }
 }
diff --git a/compiler/rustc_target/src/spec/aarch64_apple_tvos.rs b/compiler/rustc_target/src/spec/aarch64_apple_tvos.rs
index 2e31d16dc..bb7c39ff2 100644
--- a/compiler/rustc_target/src/spec/aarch64_apple_tvos.rs
+++ b/compiler/rustc_target/src/spec/aarch64_apple_tvos.rs
@@ -1,18 +1,19 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{opts, Arch};
 use crate::spec::{FramePointer, Target, TargetOptions};
 
 pub fn target() -> Target {
+    let arch = Arch::Arm64;
     Target {
         llvm_target: "arm64-apple-tvos".into(),
         pointer_width: 64,
         data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
-        arch: "aarch64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             features: "+neon,+fp-armv8,+apple-a7".into(),
             max_atomic_width: Some(128),
             forces_embed_bitcode: true,
             frame_pointer: FramePointer::NonLeaf,
-            ..opts("tvos", Arch::Arm64)
+            ..opts("tvos", arch)
         },
     }
 }
diff --git a/compiler/rustc_target/src/spec/aarch64_apple_watchos_sim.rs b/compiler/rustc_target/src/spec/aarch64_apple_watchos_sim.rs
index 3059f4214..e4af4127c 100644
--- a/compiler/rustc_target/src/spec/aarch64_apple_watchos_sim.rs
+++ b/compiler/rustc_target/src/spec/aarch64_apple_watchos_sim.rs
@@ -1,21 +1,17 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{opts, watchos_sim_llvm_target, Arch};
 use crate::spec::{FramePointer, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let base = opts("watchos", Arch::Arm64_sim);
-
-    // Clang automatically chooses a more specific target based on
-    // WATCHOS_DEPLOYMENT_TARGET.
-    // This is required for the simulator target to pick the right
-    // MACH-O commands, so we do too.
-    let arch = "arm64";
-    let llvm_target = super::apple_base::watchos_sim_llvm_target(arch);
-
+    let arch = Arch::Arm64_sim;
     Target {
-        llvm_target: llvm_target.into(),
+        // Clang automatically chooses a more specific target based on
+        // WATCHOS_DEPLOYMENT_TARGET.
+        // This is required for the simulator target to pick the right
+        // MACH-O commands, so we do too.
+        llvm_target: watchos_sim_llvm_target(arch).into(),
         pointer_width: 64,
         data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
-        arch: "aarch64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             features: "+neon,+fp-armv8,+apple-a7".into(),
             max_atomic_width: Some(128),
@@ -32,7 +28,7 @@ pub fn target() -> Target {
                 darwinpcs\0\
                 -Os\0"
                 .into(),
-            ..base
+            ..opts("watchos", arch)
         },
     }
 }
diff --git a/compiler/rustc_target/src/spec/aarch64_unknown_nto_qnx_710.rs b/compiler/rustc_target/src/spec/aarch64_unknown_nto_qnx_710.rs
new file mode 100644
index 000000000..916b6137b
--- /dev/null
+++ b/compiler/rustc_target/src/spec/aarch64_unknown_nto_qnx_710.rs
@@ -0,0 +1,28 @@
+use super::nto_qnx_base;
+use crate::spec::{Cc, LinkerFlavor, Lld, Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "aarch64-unknown-unknown".into(),
+        pointer_width: 64,
+        // from: https://llvm.org/docs/LangRef.html#data-layout
+        // e         = little endian
+        // m:e       = ELF mangling: Private symbols get a .L prefix
+        // i8:8:32   = 8-bit-integer, minimum_alignment=8, preferred_alignment=32
+        // i16:16:32 = 16-bit-integer, minimum_alignment=16, preferred_alignment=32
+        // i64:64    = 64-bit-integer, minimum_alignment=64, preferred_alignment=64
+        // i128:128  = 128-bit-integer, minimum_alignment=128, preferred_alignment=128
+        // n32:64    = 32 and 64 are native integer widths; Elements of this set are considered to support most general arithmetic operations efficiently.
+        // S128      = 128 bits are the natural alignment of the stack in bits.
+        data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".into(),
+        arch: "aarch64".into(),
+        options: TargetOptions {
+            max_atomic_width: Some(128),
+            pre_link_args: TargetOptions::link_args(
+                LinkerFlavor::Gnu(Cc::Yes, Lld::No),
+                &["-Vgcc_ntoaarch64le_cxx"],
+            ),
+            ..nto_qnx_base::opts()
+        },
+    }
+}
diff --git a/compiler/rustc_target/src/spec/abi.rs b/compiler/rustc_target/src/spec/abi.rs
index ce45fa139..cb2a0c04c 100644
--- a/compiler/rustc_target/src/spec/abi.rs
+++ b/compiler/rustc_target/src/spec/abi.rs
@@ -40,6 +40,28 @@ pub enum Abi {
     RustCold,
 }
 
+impl Abi {
+    pub fn supports_varargs(self) -> bool {
+        // * C and Cdecl obviously support varargs.
+        // * C can be based on SysV64 or Win64, so they must support varargs.
+        // * EfiApi is based on Win64 or C, so it also supports it.
+        //
+        // * Stdcall does not, because it would be impossible for the callee to clean
+        //   up the arguments. (callee doesn't know how many arguments are there)
+        // * Same for Fastcall, Vectorcall and Thiscall.
+        // * System can become Stdcall, so is also a no-no.
+        // * Other calling conventions are related to hardware or the compiler itself.
+        match self {
+            Self::C { .. }
+            | Self::Cdecl { .. }
+            | Self::Win64 { .. }
+            | Self::SysV64 { .. }
+            | Self::EfiApi => true,
+            _ => false,
+        }
+    }
+}
+
 #[derive(Copy, Clone)]
 pub struct AbiData {
     abi: Abi,
diff --git a/compiler/rustc_target/src/spec/aix_base.rs b/compiler/rustc_target/src/spec/aix_base.rs
new file mode 100644
index 000000000..c71c4ba2c
--- /dev/null
+++ b/compiler/rustc_target/src/spec/aix_base.rs
@@ -0,0 +1,32 @@
+use crate::abi::Endian;
+use crate::spec::{crt_objects, cvs, Cc, CodeModel, LinkOutputKind, LinkerFlavor, TargetOptions};
+
+pub fn opts() -> TargetOptions {
+    TargetOptions {
+        abi: "vec-extabi".into(),
+        code_model: Some(CodeModel::Small),
+        cpu: "pwr7".into(),
+        os: "aix".into(),
+        vendor: "ibm".into(),
+        dynamic_linking: true,
+        endian: Endian::Big,
+        executables: true,
+        archive_format: "aix_big".into(),
+        families: cvs!["unix"],
+        has_rpath: false,
+        has_thread_local: true,
+        crt_static_respected: true,
+        linker_flavor: LinkerFlavor::Unix(Cc::No),
+        linker: Some("ld".into()),
+        eh_frame_header: false,
+        is_like_aix: true,
+        default_dwarf_version: 3,
+        function_sections: true,
+        pre_link_objects: crt_objects::new(&[
+            (LinkOutputKind::DynamicNoPicExe, &["/usr/lib/crt0_64.o", "/usr/lib/crti_64.o"]),
+            (LinkOutputKind::DynamicPicExe, &["/usr/lib/crt0_64.o", "/usr/lib/crti_64.o"]),
+        ]),
+        dll_suffix: ".a".into(),
+        ..Default::default()
+    }
+}
diff --git a/compiler/rustc_target/src/spec/apple/tests.rs b/compiler/rustc_target/src/spec/apple/tests.rs
new file mode 100644
index 000000000..3c90a5e7e
--- /dev/null
+++ b/compiler/rustc_target/src/spec/apple/tests.rs
@@ -0,0 +1,35 @@
+use crate::spec::{
+    aarch64_apple_darwin, aarch64_apple_ios_sim, aarch64_apple_watchos_sim, i686_apple_darwin,
+    x86_64_apple_darwin, x86_64_apple_ios, x86_64_apple_tvos, x86_64_apple_watchos_sim,
+};
+
+#[test]
+fn simulator_targets_set_abi() {
+    let all_sim_targets = [
+        x86_64_apple_ios::target(),
+        x86_64_apple_tvos::target(),
+        x86_64_apple_watchos_sim::target(),
+        aarch64_apple_ios_sim::target(),
+        // Note: There is currently no ARM64 tvOS simulator target
+        aarch64_apple_watchos_sim::target(),
+    ];
+
+    for target in all_sim_targets {
+        assert_eq!(target.abi, "sim")
+    }
+}
+
+#[test]
+fn macos_link_environment_unmodified() {
+    let all_macos_targets = [
+        aarch64_apple_darwin::target(),
+        i686_apple_darwin::target(),
+        x86_64_apple_darwin::target(),
+    ];
+
+    for target in all_macos_targets {
+        // macOS targets should only remove information for cross-compiling, but never
+        // for the host.
+        assert_eq!(target.link_env_remove, crate::spec::cvs!["IPHONEOS_DEPLOYMENT_TARGET"]);
+    }
+}
diff --git a/compiler/rustc_target/src/spec/apple_base.rs b/compiler/rustc_target/src/spec/apple_base.rs
index 40bc59ca1..7f8160b5d 100644
--- a/compiler/rustc_target/src/spec/apple_base.rs
+++ b/compiler/rustc_target/src/spec/apple_base.rs
@@ -3,7 +3,78 @@ use std::{borrow::Cow, env};
 use crate::spec::{cvs, Cc, DebuginfoKind, FramePointer, LinkArgs};
 use crate::spec::{LinkerFlavor, Lld, SplitDebuginfo, StaticCow, TargetOptions};
 
-fn pre_link_args(os: &'static str, arch: &'static str, abi: &'static str) -> LinkArgs {
+#[cfg(test)]
+#[path = "apple/tests.rs"]
+mod tests;
+
+use Arch::*;
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone)]
+pub enum Arch {
+    Armv7,
+    Armv7k,
+    Armv7s,
+    Arm64,
+    Arm64_32,
+    I386,
+    I686,
+    X86_64,
+    X86_64_sim,
+    X86_64_macabi,
+    Arm64_macabi,
+    Arm64_sim,
+}
+
+impl Arch {
+    pub fn target_name(self) -> &'static str {
+        match self {
+            Armv7 => "armv7",
+            Armv7k => "armv7k",
+            Armv7s => "armv7s",
+            Arm64 | Arm64_macabi | Arm64_sim => "arm64",
+            Arm64_32 => "arm64_32",
+            I386 => "i386",
+            I686 => "i686",
+            X86_64 | X86_64_sim | X86_64_macabi => "x86_64",
+        }
+    }
+
+    pub fn target_arch(self) -> Cow<'static, str> {
+        Cow::Borrowed(match self {
+            Armv7 | Armv7k | Armv7s => "arm",
+            Arm64 | Arm64_32 | Arm64_macabi | Arm64_sim => "aarch64",
+            I386 | I686 => "x86",
+            X86_64 | X86_64_sim | X86_64_macabi => "x86_64",
+        })
+    }
+
+    fn target_abi(self) -> &'static str {
+        match self {
+            Armv7 | Armv7k | Armv7s | Arm64 | Arm64_32 | I386 | I686 | X86_64 => "",
+            X86_64_macabi | Arm64_macabi => "macabi",
+            // x86_64-apple-ios is a simulator target, even though it isn't
+            // declared that way in the target like the other ones...
+            Arm64_sim | X86_64_sim => "sim",
+        }
+    }
+
+    fn target_cpu(self) -> &'static str {
+        match self {
+            Armv7 => "cortex-a8", // iOS7 is supported on iPhone 4 and higher
+            Armv7k => "cortex-a8",
+            Armv7s => "cortex-a9",
+            Arm64 => "apple-a7",
+            Arm64_32 => "apple-s4",
+            I386 | I686 => "yonah",
+            X86_64 | X86_64_sim => "core2",
+            X86_64_macabi => "core2",
+            Arm64_macabi => "apple-a12",
+            Arm64_sim => "apple-a12",
+        }
+    }
+}
+
+fn pre_link_args(os: &'static str, arch: Arch, abi: &'static str) -> LinkArgs {
     let platform_name: StaticCow<str> = match abi {
         "sim" => format!("{}-simulator", os).into(),
         "macabi" => "mac-catalyst".into(),
@@ -19,6 +90,8 @@ fn pre_link_args(os: &'static str, arch: &'static str, abi: &'static str) -> Lin
     }
     .into();
 
+    let arch = arch.target_name();
+
     let mut args = TargetOptions::link_args(
         LinkerFlavor::Darwin(Cc::No, Lld::No),
         &["-arch", arch, "-platform_version"],
@@ -35,24 +108,29 @@ fn pre_link_args(os: &'static str, arch: &'static str, abi: &'static str) -> Lin
     args
 }
 
-pub fn opts(os: &'static str, arch: &'static str, abi: &'static str) -> TargetOptions {
-    // ELF TLS is only available in macOS 10.7+. If you try to compile for 10.6
+pub fn opts(os: &'static str, arch: Arch) -> TargetOptions {
+    // Static TLS is only available in macOS 10.7+. If you try to compile for 10.6
     // either the linker will complain if it is used or the binary will end up
     // segfaulting at runtime when run on 10.6. Rust by default supports macOS
     // 10.7+, but there is a standard environment variable,
     // MACOSX_DEPLOYMENT_TARGET, which is used to signal targeting older
     // versions of macOS. For example compiling on 10.10 with
     // MACOSX_DEPLOYMENT_TARGET set to 10.6 will cause the linker to generate
-    // warnings about the usage of ELF TLS.
+    // warnings about the usage of static TLS.
     //
-    // Here we detect what version is being requested, defaulting to 10.7. ELF
+    // Here we detect what version is being requested, defaulting to 10.7. Static
     // TLS is flagged as enabled if it looks to be supported. The architecture
     // only matters for default deployment target which is 11.0 for ARM64 and
     // 10.7 for everything else.
-    let has_thread_local = macos_deployment_target("x86_64") >= (10, 7);
+    let has_thread_local = os == "macos" && macos_deployment_target(Arch::X86_64) >= (10, 7);
+
+    let abi = arch.target_abi();
 
     TargetOptions {
+        abi: abi.into(),
         os: os.into(),
+        cpu: arch.target_cpu().into(),
+        link_env_remove: link_env_remove(arch, os),
         vendor: "apple".into(),
         linker_flavor: LinkerFlavor::Darwin(Cc::Yes, Lld::No),
         // macOS has -dead_strip, which doesn't rely on function_sections
@@ -103,46 +181,65 @@ fn deployment_target(var_name: &str) -> Option<(u32, u32)> {
         .and_then(|(a, b)| a.parse::<u32>().and_then(|a| b.parse::<u32>().map(|b| (a, b))).ok())
 }
 
-fn macos_default_deployment_target(arch: &str) -> (u32, u32) {
-    if arch == "arm64" { (11, 0) } else { (10, 7) }
+fn macos_default_deployment_target(arch: Arch) -> (u32, u32) {
+    // Note: Arm64_sim is not included since macOS has no simulator.
+    if matches!(arch, Arm64 | Arm64_macabi) { (11, 0) } else { (10, 7) }
 }
 
-fn macos_deployment_target(arch: &str) -> (u32, u32) {
+fn macos_deployment_target(arch: Arch) -> (u32, u32) {
     deployment_target("MACOSX_DEPLOYMENT_TARGET")
         .unwrap_or_else(|| macos_default_deployment_target(arch))
 }
 
-fn macos_lld_platform_version(arch: &str) -> String {
+fn macos_lld_platform_version(arch: Arch) -> String {
     let (major, minor) = macos_deployment_target(arch);
     format!("{}.{}", major, minor)
 }
 
-pub fn macos_llvm_target(arch: &str) -> String {
+pub fn macos_llvm_target(arch: Arch) -> String {
     let (major, minor) = macos_deployment_target(arch);
-    format!("{}-apple-macosx{}.{}.0", arch, major, minor)
+    format!("{}-apple-macosx{}.{}.0", arch.target_name(), major, minor)
 }
 
-pub fn macos_link_env_remove() -> Vec<StaticCow<str>> {
-    let mut env_remove = Vec::with_capacity(2);
-    // Remove the `SDKROOT` environment variable if it's clearly set for the wrong platform, which
-    // may occur when we're linking a custom build script while targeting iOS for example.
-    if let Ok(sdkroot) = env::var("SDKROOT") {
-        if sdkroot.contains("iPhoneOS.platform") || sdkroot.contains("iPhoneSimulator.platform") {
-            env_remove.push("SDKROOT".into())
+fn link_env_remove(arch: Arch, os: &'static str) -> StaticCow<[StaticCow<str>]> {
+    // Apple platforms only officially support macOS as a host for any compilation.
+    //
+    // If building for macOS, we go ahead and remove any erronous environment state
+    // that's only applicable to cross-OS compilation. Always leave anything for the
+    // host OS alone though.
+    if os == "macos" {
+        let mut env_remove = Vec::with_capacity(2);
+        // Remove the `SDKROOT` environment variable if it's clearly set for the wrong platform, which
+        // may occur when we're linking a custom build script while targeting iOS for example.
+        if let Ok(sdkroot) = env::var("SDKROOT") {
+            if sdkroot.contains("iPhoneOS.platform") || sdkroot.contains("iPhoneSimulator.platform")
+            {
+                env_remove.push("SDKROOT".into())
+            }
+        }
+        // Additionally, `IPHONEOS_DEPLOYMENT_TARGET` must not be set when using the Xcode linker at
+        // "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld",
+        // although this is apparently ignored when using the linker at "/usr/bin/ld".
+        env_remove.push("IPHONEOS_DEPLOYMENT_TARGET".into());
+        env_remove.into()
+    } else {
+        // Otherwise if cross-compiling for a different OS/SDK, remove any part
+        // of the linking environment that's wrong and reversed.
+        match arch {
+            Armv7 | Armv7k | Armv7s | Arm64 | Arm64_32 | I386 | I686 | X86_64 | X86_64_sim
+            | Arm64_sim => {
+                cvs!["MACOSX_DEPLOYMENT_TARGET"]
+            }
+            X86_64_macabi | Arm64_macabi => cvs!["IPHONEOS_DEPLOYMENT_TARGET"],
         }
     }
-    // Additionally, `IPHONEOS_DEPLOYMENT_TARGET` must not be set when using the Xcode linker at
-    // "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld",
-    // although this is apparently ignored when using the linker at "/usr/bin/ld".
-    env_remove.push("IPHONEOS_DEPLOYMENT_TARGET".into());
-    env_remove
 }
 
 fn ios_deployment_target() -> (u32, u32) {
     deployment_target("IPHONEOS_DEPLOYMENT_TARGET").unwrap_or((7, 0))
 }
 
-pub fn ios_llvm_target(arch: &str) -> String {
+pub fn ios_llvm_target(arch: Arch) -> String {
     // Modern iOS tooling extracts information about deployment target
     // from LC_BUILD_VERSION. This load command will only be emitted when
     // we build with a version specific `llvm_target`, with the version
@@ -150,7 +247,7 @@ pub fn ios_llvm_target(arch: &str) -> String {
     // to pick it up (since std and core are still built with the fallback
     // of version 7.0 and hence emit the old LC_IPHONE_MIN_VERSION).
     let (major, minor) = ios_deployment_target();
-    format!("{}-apple-ios{}.{}.0", arch, major, minor)
+    format!("{}-apple-ios{}.{}.0", arch.target_name(), major, minor)
 }
 
 fn ios_lld_platform_version() -> String {
@@ -158,9 +255,9 @@ fn ios_lld_platform_version() -> String {
     format!("{}.{}", major, minor)
 }
 
-pub fn ios_sim_llvm_target(arch: &str) -> String {
+pub fn ios_sim_llvm_target(arch: Arch) -> String {
     let (major, minor) = ios_deployment_target();
-    format!("{}-apple-ios{}.{}.0-simulator", arch, major, minor)
+    format!("{}-apple-ios{}.{}.0-simulator", arch.target_name(), major, minor)
 }
 
 fn tvos_deployment_target() -> (u32, u32) {
@@ -181,7 +278,7 @@ fn watchos_lld_platform_version() -> String {
     format!("{}.{}", major, minor)
 }
 
-pub fn watchos_sim_llvm_target(arch: &str) -> String {
+pub fn watchos_sim_llvm_target(arch: Arch) -> String {
     let (major, minor) = watchos_deployment_target();
-    format!("{}-apple-watchos{}.{}.0-simulator", arch, major, minor)
+    format!("{}-apple-watchos{}.{}.0-simulator", arch.target_name(), major, minor)
 }
diff --git a/compiler/rustc_target/src/spec/apple_sdk_base.rs b/compiler/rustc_target/src/spec/apple_sdk_base.rs
deleted file mode 100644
index 49e302676..000000000
--- a/compiler/rustc_target/src/spec/apple_sdk_base.rs
+++ /dev/null
@@ -1,72 +0,0 @@
-use crate::spec::{cvs, TargetOptions};
-use std::borrow::Cow;
-
-use Arch::*;
-#[allow(non_camel_case_types)]
-#[derive(Copy, Clone)]
-pub enum Arch {
-    Armv7,
-    Armv7k,
-    Armv7s,
-    Arm64,
-    Arm64_32,
-    I386,
-    X86_64,
-    X86_64_macabi,
-    Arm64_macabi,
-    Arm64_sim,
-}
-
-fn target_arch_name(arch: Arch) -> &'static str {
-    match arch {
-        Armv7 => "armv7",
-        Armv7k => "armv7k",
-        Armv7s => "armv7s",
-        Arm64 | Arm64_macabi | Arm64_sim => "arm64",
-        Arm64_32 => "arm64_32",
-        I386 => "i386",
-        X86_64 | X86_64_macabi => "x86_64",
-    }
-}
-
-fn target_abi(arch: Arch) -> &'static str {
-    match arch {
-        Armv7 | Armv7k | Armv7s | Arm64 | Arm64_32 | I386 | X86_64 => "",
-        X86_64_macabi | Arm64_macabi => "macabi",
-        Arm64_sim => "sim",
-    }
-}
-
-fn target_cpu(arch: Arch) -> &'static str {
-    match arch {
-        Armv7 => "cortex-a8", // iOS7 is supported on iPhone 4 and higher
-        Armv7k => "cortex-a8",
-        Armv7s => "cortex-a9",
-        Arm64 => "apple-a7",
-        Arm64_32 => "apple-s4",
-        I386 => "yonah",
-        X86_64 => "core2",
-        X86_64_macabi => "core2",
-        Arm64_macabi => "apple-a12",
-        Arm64_sim => "apple-a12",
-    }
-}
-
-fn link_env_remove(arch: Arch) -> Cow<'static, [Cow<'static, str>]> {
-    match arch {
-        Armv7 | Armv7k | Armv7s | Arm64 | Arm64_32 | I386 | X86_64 | Arm64_sim => {
-            cvs!["MACOSX_DEPLOYMENT_TARGET"]
-        }
-        X86_64_macabi | Arm64_macabi => cvs!["IPHONEOS_DEPLOYMENT_TARGET"],
-    }
-}
-
-pub fn opts(os: &'static str, arch: Arch) -> TargetOptions {
-    TargetOptions {
-        abi: target_abi(arch).into(),
-        cpu: target_cpu(arch).into(),
-        link_env_remove: link_env_remove(arch),
-        has_thread_local: false,
-        ..super::apple_base::opts(os, target_arch_name(arch), target_abi(arch))
-    }
-}
diff --git a/compiler/rustc_target/src/spec/arm64_32_apple_watchos.rs b/compiler/rustc_target/src/spec/arm64_32_apple_watchos.rs
index cb7f5f2a5..52ee68e75 100644
--- a/compiler/rustc_target/src/spec/arm64_32_apple_watchos.rs
+++ b/compiler/rustc_target/src/spec/arm64_32_apple_watchos.rs
@@ -1,4 +1,4 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{opts, Arch};
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -12,6 +12,8 @@ pub fn target() -> Target {
             features: "+neon,+fp-armv8,+apple-a7".into(),
             max_atomic_width: Some(128),
             forces_embed_bitcode: true,
+            dynamic_linking: false,
+            position_independent_executables: true,
             // These arguments are not actually invoked - they just have
             // to look right to pass App Store validation.
             bitcode_llvm_cmdline: "-triple\0\
diff --git a/compiler/rustc_target/src/spec/armv7_apple_ios.rs b/compiler/rustc_target/src/spec/armv7_apple_ios.rs
index 57fd74a36..3259c8547 100644
--- a/compiler/rustc_target/src/spec/armv7_apple_ios.rs
+++ b/compiler/rustc_target/src/spec/armv7_apple_ios.rs
@@ -1,18 +1,21 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{ios_llvm_target, opts, Arch};
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
-    let llvm_target = super::apple_base::ios_llvm_target("armv7");
-
+    let arch = Arch::Armv7;
     Target {
-        llvm_target: llvm_target.into(),
+        // Clang automatically chooses a more specific target based on
+        // IPHONEOS_DEPLOYMENT_TARGET.
+        // This is required for the target to pick the right
+        // MACH-O commands, so we do too.
+        llvm_target: ios_llvm_target(arch).into(),
         pointer_width: 32,
         data_layout: "e-m:o-p:32:32-Fi8-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32".into(),
-        arch: "arm".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             features: "+v7,+vfp3,+neon".into(),
             max_atomic_width: Some(64),
-            ..opts("ios", Arch::Armv7)
+            ..opts("ios", arch)
         },
     }
 }
diff --git a/compiler/rustc_target/src/spec/armv7k_apple_watchos.rs b/compiler/rustc_target/src/spec/armv7k_apple_watchos.rs
index af5d1c2ff..6e1d00d1f 100644
--- a/compiler/rustc_target/src/spec/armv7k_apple_watchos.rs
+++ b/compiler/rustc_target/src/spec/armv7k_apple_watchos.rs
@@ -1,17 +1,19 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{opts, Arch};
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
-    let base = opts("watchos", Arch::Armv7k);
+    let arch = Arch::Armv7k;
     Target {
         llvm_target: "armv7k-apple-watchos".into(),
         pointer_width: 32,
         data_layout: "e-m:o-p:32:32-Fi8-i64:64-a:0:32-n32-S128".into(),
-        arch: "arm".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             features: "+v7,+vfp4,+neon".into(),
             max_atomic_width: Some(64),
             forces_embed_bitcode: true,
+            dynamic_linking: false,
+            position_independent_executables: true,
             // These arguments are not actually invoked - they just have
             // to look right to pass App Store validation.
             bitcode_llvm_cmdline: "-triple\0\
@@ -22,7 +24,7 @@ pub fn target() -> Target {
                 darwinpcs\0\
                 -Os\0"
                 .into(),
-            ..base
+            ..opts("watchos", arch)
         },
     }
 }
diff --git a/compiler/rustc_target/src/spec/armv7s_apple_ios.rs b/compiler/rustc_target/src/spec/armv7s_apple_ios.rs
index cc17265b2..be4bc6758 100644
--- a/compiler/rustc_target/src/spec/armv7s_apple_ios.rs
+++ b/compiler/rustc_target/src/spec/armv7s_apple_ios.rs
@@ -1,16 +1,17 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{opts, Arch};
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
+    let arch = Arch::Armv7s;
     Target {
         llvm_target: "armv7s-apple-ios".into(),
         pointer_width: 32,
         data_layout: "e-m:o-p:32:32-Fi8-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32".into(),
-        arch: "arm".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             features: "+v7,+vfp4,+neon".into(),
             max_atomic_width: Some(64),
-            ..opts("ios", Arch::Armv7s)
+            ..opts("ios", arch)
         },
     }
 }
diff --git a/compiler/rustc_target/src/spec/i386_apple_ios.rs b/compiler/rustc_target/src/spec/i386_apple_ios.rs
index b85214a9c..581998161 100644
--- a/compiler/rustc_target/src/spec/i386_apple_ios.rs
+++ b/compiler/rustc_target/src/spec/i386_apple_ios.rs
@@ -1,21 +1,23 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{ios_sim_llvm_target, opts, Arch};
 use crate::spec::{StackProbeType, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let base = opts("ios", Arch::I386);
-    let llvm_target = super::apple_base::ios_sim_llvm_target("i386");
-
+    let arch = Arch::I386;
     Target {
-        llvm_target: llvm_target.into(),
+        // Clang automatically chooses a more specific target based on
+        // IPHONEOS_DEPLOYMENT_TARGET.
+        // This is required for the target to pick the right
+        // MACH-O commands, so we do too.
+        llvm_target: ios_sim_llvm_target(arch).into(),
         pointer_width: 32,
         data_layout: "e-m:o-p:32:32-p270:32:32-p271:32:32-p272:64:64-\
             f64:32:64-f80:128-n8:16:32-S128"
             .into(),
-        arch: "x86".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             max_atomic_width: Some(64),
             stack_probes: StackProbeType::X86,
-            ..base
+            ..opts("ios", arch)
         },
     }
 }
diff --git a/compiler/rustc_target/src/spec/i686_apple_darwin.rs b/compiler/rustc_target/src/spec/i686_apple_darwin.rs
index 15607c12e..ad22467ba 100644
--- a/compiler/rustc_target/src/spec/i686_apple_darwin.rs
+++ b/compiler/rustc_target/src/spec/i686_apple_darwin.rs
@@ -1,28 +1,27 @@
+use super::apple_base::{macos_llvm_target, opts, Arch};
 use crate::spec::{Cc, FramePointer, LinkerFlavor, Lld, StackProbeType, Target, TargetOptions};
 
 pub fn target() -> Target {
-    // ld64 only understand i386 and not i686
-    let mut base = super::apple_base::opts("macos", "i386", "");
-    base.cpu = "yonah".into();
+    // ld64 only understands i386 and not i686
+    let arch = Arch::I386;
+    let mut base = opts("macos", arch);
     base.max_atomic_width = Some(64);
     base.add_pre_link_args(LinkerFlavor::Darwin(Cc::Yes, Lld::No), &["-m32"]);
-    base.link_env_remove.to_mut().extend(super::apple_base::macos_link_env_remove());
     base.stack_probes = StackProbeType::X86;
     base.frame_pointer = FramePointer::Always;
 
-    // Clang automatically chooses a more specific target based on
-    // MACOSX_DEPLOYMENT_TARGET.  To enable cross-language LTO to work
-    // correctly, we do too.
-    let arch = "i686";
-    let llvm_target = super::apple_base::macos_llvm_target(&arch);
-
     Target {
-        llvm_target: llvm_target.into(),
+        // Clang automatically chooses a more specific target based on
+        // MACOSX_DEPLOYMENT_TARGET.  To enable cross-language LTO to work
+        // correctly, we do too.
+        //
+        // While ld64 doesn't understand i686, LLVM does.
+        llvm_target: macos_llvm_target(Arch::I686).into(),
         pointer_width: 32,
         data_layout: "e-m:o-p:32:32-p270:32:32-p271:32:32-p272:64:64-\
             f64:32:64-f80:128-n8:16:32-S128"
             .into(),
-        arch: "x86".into(),
+        arch: arch.target_arch(),
         options: TargetOptions { mcount: "\u{1}mcount".into(), ..base },
     }
 }
diff --git a/compiler/rustc_target/src/spec/linux_kernel_base.rs b/compiler/rustc_target/src/spec/linux_kernel_base.rs
deleted file mode 100644
index f41533a95..000000000
--- a/compiler/rustc_target/src/spec/linux_kernel_base.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-use crate::spec::TargetOptions;
-use crate::spec::{FramePointer, PanicStrategy, RelocModel, RelroLevel, StackProbeType};
-
-pub fn opts() -> TargetOptions {
-    TargetOptions {
-        env: "gnu".into(),
-        disable_redzone: true,
-        panic_strategy: PanicStrategy::Abort,
-        stack_probes: StackProbeType::X86,
-        frame_pointer: FramePointer::Always,
-        position_independent_executables: true,
-        needs_plt: true,
-        relro_level: RelroLevel::Full,
-        relocation_model: RelocModel::Static,
-
-        ..Default::default()
-    }
-}
diff --git a/compiler/rustc_target/src/spec/mipsel_sony_psx.rs b/compiler/rustc_target/src/spec/mipsel_sony_psx.rs
new file mode 100644
index 000000000..12a66efdd
--- /dev/null
+++ b/compiler/rustc_target/src/spec/mipsel_sony_psx.rs
@@ -0,0 +1,37 @@
+use crate::spec::{cvs, Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "mipsel-sony-psx".into(),
+        pointer_width: 32,
+        data_layout: "e-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64".into(),
+        arch: "mips".into(),
+
+        options: TargetOptions {
+            os: "none".into(),
+            env: "psx".into(),
+            vendor: "sony".into(),
+            linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::Yes),
+            cpu: "mips1".into(),
+            executables: true,
+            linker: Some("rust-lld".into()),
+            relocation_model: RelocModel::Static,
+            exe_suffix: ".exe".into(),
+
+            // PSX doesn't natively support floats.
+            features: "+soft-float".into(),
+
+            // This should be 16 bits, but LLVM incorrectly tries emitting MIPS-II SYNC instructions
+            // for atomic loads and stores. This crashes rustc so we have to disable the Atomic* API
+            // until this is fixed upstream. See https://reviews.llvm.org/D122427#3420144 for more
+            // info.
+            max_atomic_width: Some(0),
+
+            // PSX does not support trap-on-condition instructions.
+            llvm_args: cvs!["-mno-check-zero-division"],
+            llvm_abiname: "o32".into(),
+            panic_strategy: PanicStrategy::Abort,
+            ..Default::default()
+        },
+    }
+}
diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index 8909cf33a..d05b8aa42 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -34,7 +34,8 @@
 //! the target's settings, though `target-feature` and `link-args` will *add*
 //! to the list specified by the target, rather than replace.
 
-use crate::abi::Endian;
+use crate::abi::call::Conv;
+use crate::abi::{Endian, Integer, Size, TargetDataLayout, TargetDataLayoutErrors};
 use crate::json::{Json, ToJson};
 use crate::spec::abi::{lookup as lookup_abi, Abi};
 use crate::spec::crt_objects::{CrtObjects, LinkSelfContainedDefault};
@@ -57,9 +58,9 @@ use rustc_macros::HashStable_Generic;
 pub mod abi;
 pub mod crt_objects;
 
+mod aix_base;
 mod android_base;
 mod apple_base;
-mod apple_sdk_base;
 mod avr_gnu_base;
 mod bpf_base;
 mod dragonfly_base;
@@ -71,11 +72,11 @@ mod illumos_base;
 mod l4re_base;
 mod linux_base;
 mod linux_gnu_base;
-mod linux_kernel_base;
 mod linux_musl_base;
 mod linux_uclibc_base;
 mod msvc_base;
 mod netbsd_base;
+mod nto_qnx_base;
 mod openbsd_base;
 mod redox_base;
 mod solaris_base;
@@ -115,7 +116,7 @@ pub enum Lld {
 /// relevant now.
 ///
 /// The second goal is to keep the number of flavors to the minimum if possible.
-/// LLD somewhat forces our hand here because that linker is self-sufficent only if its executable
+/// LLD somewhat forces our hand here because that linker is self-sufficient only if its executable
 /// (`argv[0]`) is named in specific way, otherwise it doesn't work and requires a
 /// `-flavor LLD_FLAVOR` argument to choose which logic to use. Our shipped `rust-lld` in
 /// particular is not named in such specific way, so it needs the flavor option, so we make our
@@ -1003,7 +1004,7 @@ macro_rules! supported_targets {
             $(
                 #[test] // `#[test]`
                 fn $module() {
-                    tests_impl::test_target(super::$module::target(), $triple);
+                    tests_impl::test_target(super::$module::target());
                 }
             )+
         }
@@ -1027,6 +1028,7 @@ supported_targets! {
     ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
     ("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
     ("powerpc-unknown-linux-musl", powerpc_unknown_linux_musl),
+    ("powerpc64-ibm-aix", powerpc64_ibm_aix),
     ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
     ("powerpc64-unknown-linux-musl", powerpc64_unknown_linux_musl),
     ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
@@ -1071,8 +1073,6 @@ supported_targets! {
     ("thumbv7neon-linux-androideabi", thumbv7neon_linux_androideabi),
     ("aarch64-linux-android", aarch64_linux_android),
 
-    ("x86_64-unknown-none-linuxkernel", x86_64_unknown_none_linuxkernel),
-
     ("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
     ("armv6-unknown-freebsd", armv6_unknown_freebsd),
     ("armv7-unknown-freebsd", armv7_unknown_freebsd),
@@ -1222,6 +1222,7 @@ supported_targets! {
     ("armv7a-kmc-solid_asp3-eabihf", armv7a_kmc_solid_asp3_eabihf),
 
     ("mipsel-sony-psp", mipsel_sony_psp),
+    ("mipsel-sony-psx", mipsel_sony_psx),
     ("mipsel-unknown-none", mipsel_unknown_none),
     ("thumbv4t-none-eabi", thumbv4t_none_eabi),
     ("armv4t-none-eabi", armv4t_none_eabi),
@@ -1245,6 +1246,9 @@ supported_targets! {
     ("x86_64-unknown-none", x86_64_unknown_none),
 
     ("mips64-openwrt-linux-musl", mips64_openwrt_linux_musl),
+
+    ("aarch64-unknown-nto-qnx710", aarch64_unknown_nto_qnx_710),
+    ("x86_64-pc-nto-qnx710", x86_64_pc_nto_qnx710),
 }
 
 /// Cow-Vec-Str: Cow<'static, [Cow<'static, str>]>
@@ -1313,6 +1317,35 @@ pub struct Target {
     pub options: TargetOptions,
 }
 
+impl Target {
+    pub fn parse_data_layout<'a>(&'a self) -> Result<TargetDataLayout, TargetDataLayoutErrors<'a>> {
+        let mut dl = TargetDataLayout::parse_from_llvm_datalayout_string(&self.data_layout)?;
+
+        // Perform consistency checks against the Target information.
+        if dl.endian != self.endian {
+            return Err(TargetDataLayoutErrors::InconsistentTargetArchitecture {
+                dl: dl.endian.as_str(),
+                target: self.endian.as_str(),
+            });
+        }
+
+        let target_pointer_width: u64 = self.pointer_width.into();
+        if dl.pointer_size.bits() != target_pointer_width {
+            return Err(TargetDataLayoutErrors::InconsistentTargetPointerWidth {
+                pointer_size: dl.pointer_size.bits(),
+                target: self.pointer_width,
+            });
+        }
+
+        dl.c_enum_min_size = match Integer::from_size(Size::from_bits(self.c_enum_min_bits)) {
+            Ok(bits) => bits,
+            Err(err) => return Err(TargetDataLayoutErrors::InvalidBitsSize { err }),
+        };
+
+        Ok(dl)
+    }
+}
+
 pub trait HasTargetSpec {
     fn target_spec(&self) -> &Target;
 }
@@ -1452,6 +1485,9 @@ pub struct TargetOptions {
     pub families: StaticCow<[StaticCow<str>]>,
     /// Whether the target toolchain's ABI supports returning small structs as an integer.
     pub abi_return_struct_as_int: bool,
+    /// Whether the target toolchain is like AIX's. Linker options on AIX are special and it uses
+    /// XCOFF as binary format. Defaults to false.
+    pub is_like_aix: bool,
     /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
     /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
     /// Also indiates whether to use Apple-specific ABI changes, such as extending function
@@ -1526,9 +1562,9 @@ pub struct TargetOptions {
 
     /// Flag indicating whether #[thread_local] is available for this target.
     pub has_thread_local: bool,
-    // This is mainly for easy compatibility with emscripten.
-    // If we give emcc .o files that are actually .bc files it
-    // will 'just work'.
+    /// This is mainly for easy compatibility with emscripten.
+    /// If we give emcc .o files that are actually .bc files it
+    /// will 'just work'.
     pub obj_is_bitcode: bool,
     /// Whether the target requires that emitted object code includes bitcode.
     pub forces_embed_bitcode: bool,
@@ -1667,6 +1703,14 @@ pub struct TargetOptions {
     /// Whether the target supports stack canary checks. `true` by default,
     /// since this is most common among tier 1 and tier 2 targets.
     pub supports_stack_protector: bool,
+
+    /// The name of entry function.
+    /// Default value is "main"
+    pub entry_name: StaticCow<str>,
+
+    /// The ABI of entry function.
+    /// Default value is `Conv::C`, i.e. C call convention
+    pub entry_abi: Conv,
 }
 
 /// Add arguments for the given flavor and also for its "twin" flavors
@@ -1807,6 +1851,7 @@ impl Default for TargetOptions {
             staticlib_suffix: ".a".into(),
             families: cvs![],
             abi_return_struct_as_int: false,
+            is_like_aix: false,
             is_like_osx: false,
             is_like_solaris: false,
             is_like_windows: false,
@@ -1883,6 +1928,8 @@ impl Default for TargetOptions {
             c_enum_min_bits: 32,
             generate_arange_section: true,
             supports_stack_protector: true,
+            entry_name: "main".into(),
+            entry_abi: Conv::C,
         }
     }
 }
@@ -1914,6 +1961,7 @@ impl Target {
                 Abi::Stdcall { unwind }
             }
             Abi::System { unwind } => Abi::C { unwind },
+            Abi::EfiApi if self.arch == "arm" => Abi::Aapcs { unwind: false },
             Abi::EfiApi if self.arch == "x86_64" => Abi::Win64 { unwind: false },
             Abi::EfiApi => Abi::C { unwind: false },
 
@@ -1940,8 +1988,10 @@ impl Target {
             | PlatformIntrinsic
             | Unadjusted
             | Cdecl { .. }
-            | EfiApi
             | RustCold => true,
+            EfiApi => {
+                ["arm", "aarch64", "riscv32", "riscv64", "x86", "x86_64"].contains(&&self.arch[..])
+            }
             X86Interrupt => ["x86", "x86_64"].contains(&&self.arch[..]),
             Aapcs { .. } => "arm" == self.arch,
             CCmseNonSecureCall => ["arm", "aarch64"].contains(&&self.arch[..]),
@@ -2400,6 +2450,18 @@ impl Target {
                     }
                 }
             } );
+            ($key_name:ident, Conv) => ( {
+                let name = (stringify!($key_name)).replace("_", "-");
+                obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
+                    match Conv::from_str(s) {
+                        Ok(c) => {
+                            base.$key_name = c;
+                            Some(Ok(()))
+                        }
+                        Err(e) => Some(Err(e))
+                    }
+                })).unwrap_or(Ok(()))
+            } );
         }
 
         if let Some(j) = obj.remove("target-endian") {
@@ -2461,6 +2523,7 @@ impl Target {
         key!(staticlib_suffix);
         key!(families, TargetFamilies);
         key!(abi_return_struct_as_int, bool);
+        key!(is_like_aix, bool);
         key!(is_like_osx, bool);
         key!(is_like_solaris, bool);
         key!(is_like_windows, bool);
@@ -2519,6 +2582,8 @@ impl Target {
         key!(c_enum_min_bits, u64);
         key!(generate_arange_section, bool);
         key!(supports_stack_protector, bool);
+        key!(entry_name);
+        key!(entry_abi, Conv)?;
 
         if base.is_builtin {
             // This can cause unfortunate ICEs later down the line.
@@ -2593,7 +2658,7 @@ impl Target {
 
                 // Additionally look in the sysroot under `lib/rustlib/<triple>/target.json`
                 // as a fallback.
-                let rustlib_path = crate::target_rustlib_path(&sysroot, &target_triple);
+                let rustlib_path = crate::target_rustlib_path(sysroot, target_triple);
                 let p = PathBuf::from_iter([
                     Path::new(sysroot),
                     Path::new(&rustlib_path),
@@ -2712,6 +2777,7 @@ impl ToJson for Target {
         target_option_val!(staticlib_suffix);
         target_option_val!(families, "target-family");
         target_option_val!(abi_return_struct_as_int);
+        target_option_val!(is_like_aix);
         target_option_val!(is_like_osx);
         target_option_val!(is_like_solaris);
         target_option_val!(is_like_windows);
@@ -2769,6 +2835,8 @@ impl ToJson for Target {
         target_option_val!(c_enum_min_bits);
         target_option_val!(generate_arange_section);
         target_option_val!(supports_stack_protector);
+        target_option_val!(entry_name);
+        target_option_val!(entry_abi);
 
         if let Some(abi) = self.default_adjusted_cabi {
             d.insert("default-adjusted-cabi".into(), Abi::name(abi).to_json());
diff --git a/compiler/rustc_target/src/spec/nto_qnx_base.rs b/compiler/rustc_target/src/spec/nto_qnx_base.rs
new file mode 100644
index 000000000..6fb581ef5
--- /dev/null
+++ b/compiler/rustc_target/src/spec/nto_qnx_base.rs
@@ -0,0 +1,19 @@
+use crate::spec::{cvs, RelroLevel, TargetOptions};
+
+pub fn opts() -> TargetOptions {
+    TargetOptions {
+        crt_static_respected: true,
+        dynamic_linking: true,
+        env: "nto71".into(),
+        executables: true,
+        families: cvs!["unix"],
+        has_rpath: true,
+        has_thread_local: false,
+        linker: Some("qcc".into()),
+        os: "nto".into(),
+        position_independent_executables: true,
+        static_position_independent_executables: true,
+        relro_level: RelroLevel::Full,
+        ..Default::default()
+    }
+}
diff --git a/compiler/rustc_target/src/spec/powerpc64_ibm_aix.rs b/compiler/rustc_target/src/spec/powerpc64_ibm_aix.rs
new file mode 100644
index 000000000..e3eb9bccd
--- /dev/null
+++ b/compiler/rustc_target/src/spec/powerpc64_ibm_aix.rs
@@ -0,0 +1,23 @@
+use crate::spec::{Cc, LinkerFlavor, Target};
+
+pub fn target() -> Target {
+    let mut base = super::aix_base::opts();
+    base.max_atomic_width = Some(64);
+    base.add_pre_link_args(
+        LinkerFlavor::Unix(Cc::No),
+        &[
+            "-b64".into(),
+            "-bpT:0x100000000".into(),
+            "-bpD:0x110000000".into(),
+            "-bcdtors:all:0:s".into(),
+        ],
+    );
+
+    Target {
+        llvm_target: "powerpc64-ibm-aix".into(),
+        pointer_width: 64,
+        data_layout: "E-m:a-i64:64-n32:64-S128-v256:256:256-v512:512:512".into(),
+        arch: "powerpc64".into(),
+        options: base,
+    }
+}
diff --git a/compiler/rustc_target/src/spec/riscv64gc_unknown_freebsd.rs b/compiler/rustc_target/src/spec/riscv64gc_unknown_freebsd.rs
index 0539eca6c..8281bac10 100644
--- a/compiler/rustc_target/src/spec/riscv64gc_unknown_freebsd.rs
+++ b/compiler/rustc_target/src/spec/riscv64gc_unknown_freebsd.rs
@@ -4,7 +4,7 @@ pub fn target() -> Target {
     Target {
         llvm_target: "riscv64-unknown-freebsd".into(),
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         arch: "riscv64".into(),
         options: TargetOptions {
             code_model: Some(CodeModel::Medium),
diff --git a/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_gnu.rs b/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_gnu.rs
index 7d1bf228c..90dccb280 100644
--- a/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_gnu.rs
+++ b/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_gnu.rs
@@ -4,7 +4,7 @@ pub fn target() -> Target {
     Target {
         llvm_target: "riscv64-unknown-linux-gnu".into(),
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         arch: "riscv64".into(),
         options: TargetOptions {
             code_model: Some(CodeModel::Medium),
diff --git a/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_musl.rs b/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_musl.rs
index f04f8a48b..1a56c78e6 100644
--- a/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_musl.rs
+++ b/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_musl.rs
@@ -4,7 +4,7 @@ pub fn target() -> Target {
     Target {
         llvm_target: "riscv64-unknown-linux-musl".into(),
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         arch: "riscv64".into(),
         options: TargetOptions {
             code_model: Some(CodeModel::Medium),
diff --git a/compiler/rustc_target/src/spec/riscv64gc_unknown_none_elf.rs b/compiler/rustc_target/src/spec/riscv64gc_unknown_none_elf.rs
index 67806d578..409b0b269 100644
--- a/compiler/rustc_target/src/spec/riscv64gc_unknown_none_elf.rs
+++ b/compiler/rustc_target/src/spec/riscv64gc_unknown_none_elf.rs
@@ -3,7 +3,7 @@ use crate::spec::{RelocModel, Target, TargetOptions};
 
 pub fn target() -> Target {
     Target {
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         llvm_target: "riscv64".into(),
         pointer_width: 64,
         arch: "riscv64".into(),
diff --git a/compiler/rustc_target/src/spec/riscv64gc_unknown_openbsd.rs b/compiler/rustc_target/src/spec/riscv64gc_unknown_openbsd.rs
index cd10f3afa..ade9d7762 100644
--- a/compiler/rustc_target/src/spec/riscv64gc_unknown_openbsd.rs
+++ b/compiler/rustc_target/src/spec/riscv64gc_unknown_openbsd.rs
@@ -4,7 +4,7 @@ pub fn target() -> Target {
     Target {
         llvm_target: "riscv64-unknown-openbsd".into(),
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         arch: "riscv64".into(),
         options: TargetOptions {
             code_model: Some(CodeModel::Medium),
diff --git a/compiler/rustc_target/src/spec/riscv64imac_unknown_none_elf.rs b/compiler/rustc_target/src/spec/riscv64imac_unknown_none_elf.rs
index f371e09be..87aba9171 100644
--- a/compiler/rustc_target/src/spec/riscv64imac_unknown_none_elf.rs
+++ b/compiler/rustc_target/src/spec/riscv64imac_unknown_none_elf.rs
@@ -3,7 +3,7 @@ use crate::spec::{RelocModel, Target, TargetOptions};
 
 pub fn target() -> Target {
     Target {
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         llvm_target: "riscv64".into(),
         pointer_width: 64,
         arch: "riscv64".into(),
diff --git a/compiler/rustc_target/src/spec/tests/tests_impl.rs b/compiler/rustc_target/src/spec/tests/tests_impl.rs
index 172da0ed5..e0ecf8037 100644
--- a/compiler/rustc_target/src/spec/tests/tests_impl.rs
+++ b/compiler/rustc_target/src/spec/tests/tests_impl.rs
@@ -2,15 +2,15 @@ use super::super::*;
 use std::assert_matches::assert_matches;
 
 // Test target self-consistency and JSON encoding/decoding roundtrip.
-pub(super) fn test_target(mut target: Target, triple: &str) {
+pub(super) fn test_target(mut target: Target) {
     let recycled_target = Target::from_json(target.to_json()).map(|(j, _)| j);
     target.update_to_cli();
-    target.check_consistency(triple);
+    target.check_consistency();
     assert_eq!(recycled_target, Ok(target));
 }
 
 impl Target {
-    fn check_consistency(&self, triple: &str) {
+    fn check_consistency(&self) {
         assert_eq!(self.is_like_osx, self.vendor == "apple");
         assert_eq!(self.is_like_solaris, self.os == "solaris" || self.os == "illumos");
         assert_eq!(self.is_like_windows, self.os == "windows" || self.os == "uefi");
@@ -129,8 +129,7 @@ impl Target {
         if self.dynamic_linking && !(self.is_like_wasm && self.os != "emscripten") {
             assert_eq!(self.relocation_model, RelocModel::Pic);
         }
-        // PIEs are supported but not enabled by default with linuxkernel target.
-        if self.position_independent_executables && !triple.ends_with("-linuxkernel") {
+        if self.position_independent_executables {
             assert_eq!(self.relocation_model, RelocModel::Pic);
         }
         // The UEFI targets do not support dynamic linking but still require PIC (#101377).
diff --git a/compiler/rustc_target/src/spec/wasm32_unknown_unknown.rs b/compiler/rustc_target/src/spec/wasm32_unknown_unknown.rs
index 8dad941b5..06529c2e4 100644
--- a/compiler/rustc_target/src/spec/wasm32_unknown_unknown.rs
+++ b/compiler/rustc_target/src/spec/wasm32_unknown_unknown.rs
@@ -33,12 +33,6 @@ pub fn target() -> Target {
             // For now this target just never has an entry symbol no matter the output
             // type, so unconditionally pass this.
             "--no-entry",
-            // Rust really needs a way for users to specify exports and imports in
-            // the source code. --export-dynamic isn't the right tool for this job,
-            // however it does have the side effect of automatically exporting a lot
-            // of symbols, which approximates what people want when compiling for
-            // wasm32-unknown-unknown expect, so use it for now.
-            "--export-dynamic",
         ],
     );
     options.add_pre_link_args(
@@ -48,7 +42,6 @@ pub fn target() -> Target {
             // otherwise
             "--target=wasm32-unknown-unknown",
             "-Wl,--no-entry",
-            "-Wl,--export-dynamic",
         ],
     );
 
diff --git a/compiler/rustc_target/src/spec/wasm32_wasi.rs b/compiler/rustc_target/src/spec/wasm32_wasi.rs
index 93a956403..a0476d542 100644
--- a/compiler/rustc_target/src/spec/wasm32_wasi.rs
+++ b/compiler/rustc_target/src/spec/wasm32_wasi.rs
@@ -72,7 +72,8 @@
 //! best we can with this target. Don't start relying on too much here unless
 //! you know what you're getting in to!
 
-use super::{crt_objects, wasm_base, Cc, LinkerFlavor, Target};
+use super::crt_objects::{self, LinkSelfContainedDefault};
+use super::{wasm_base, Cc, LinkerFlavor, Target};
 
 pub fn target() -> Target {
     let mut options = wasm_base::options();
@@ -83,6 +84,9 @@ pub fn target() -> Target {
     options.pre_link_objects_self_contained = crt_objects::pre_wasi_self_contained();
     options.post_link_objects_self_contained = crt_objects::post_wasi_self_contained();
 
+    // FIXME: Figure out cases in which WASM needs to link with a native toolchain.
+    options.link_self_contained = LinkSelfContainedDefault::True;
+
     // Right now this is a bit of a workaround but we're currently saying that
     // the target by default has a static crt which we're taking as a signal
     // for "use the bundled crt". If that's turned off then the system's crt
@@ -100,6 +104,10 @@ pub fn target() -> Target {
     // `args::args()` makes the WASI API calls itself.
     options.main_needs_argc_argv = false;
 
+    // And, WASI mangles the name of "main" to distinguish between different
+    // signatures.
+    options.entry_name = "__main_void".into();
+
     Target {
         llvm_target: "wasm32-wasi".into(),
         pointer_width: 32,
diff --git a/compiler/rustc_target/src/spec/wasm_base.rs b/compiler/rustc_target/src/spec/wasm_base.rs
index 528a84a8b..625d3b37c 100644
--- a/compiler/rustc_target/src/spec/wasm_base.rs
+++ b/compiler/rustc_target/src/spec/wasm_base.rs
@@ -1,4 +1,3 @@
-use super::crt_objects::LinkSelfContainedDefault;
 use super::{cvs, Cc, LinkerFlavor, PanicStrategy, RelocModel, TargetOptions, TlsModel};
 
 pub fn options() -> TargetOptions {
@@ -95,9 +94,6 @@ pub fn options() -> TargetOptions {
 
         pre_link_args,
 
-        // FIXME: Figure out cases in which WASM needs to link with a native toolchain.
-        link_self_contained: LinkSelfContainedDefault::True,
-
         // This has no effect in LLVM 8 or prior, but in LLVM 9 and later when
         // PIC code is implemented this has quite a drastic effect if it stays
         // at the default, `pic`. In an effort to keep wasm binaries as minimal
diff --git a/compiler/rustc_target/src/spec/windows_gnullvm_base.rs b/compiler/rustc_target/src/spec/windows_gnullvm_base.rs
index 58210c75a..cada28652 100644
--- a/compiler/rustc_target/src/spec/windows_gnullvm_base.rs
+++ b/compiler/rustc_target/src/spec/windows_gnullvm_base.rs
@@ -1,4 +1,5 @@
-use crate::spec::{cvs, Cc, LinkerFlavor, Lld, TargetOptions};
+use crate::spec::{cvs, Cc, DebuginfoKind, LinkerFlavor, Lld, SplitDebuginfo, TargetOptions};
+use std::borrow::Cow;
 
 pub fn opts() -> TargetOptions {
     // We cannot use `-nodefaultlibs` because compiler-rt has to be passed
@@ -36,7 +37,10 @@ pub fn opts() -> TargetOptions {
         eh_frame_header: false,
         no_default_libraries: false,
         has_thread_local: true,
-
+        // FIXME(davidtwco): Support Split DWARF on Windows GNU - may require LLVM changes to
+        // output DWO, despite using DWARF, doesn't use ELF..
+        debuginfo_kind: DebuginfoKind::Pdb,
+        supported_split_debuginfo: Cow::Borrowed(&[SplitDebuginfo::Off]),
         ..Default::default()
     }
 }
diff --git a/compiler/rustc_target/src/spec/x86_64_apple_darwin.rs b/compiler/rustc_target/src/spec/x86_64_apple_darwin.rs
index 087be1b95..9a3e7a805 100644
--- a/compiler/rustc_target/src/spec/x86_64_apple_darwin.rs
+++ b/compiler/rustc_target/src/spec/x86_64_apple_darwin.rs
@@ -1,29 +1,26 @@
+use super::apple_base::{macos_llvm_target, opts, Arch};
 use crate::spec::{Cc, FramePointer, LinkerFlavor, Lld, SanitizerSet};
 use crate::spec::{StackProbeType, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let arch = "x86_64";
-    let mut base = super::apple_base::opts("macos", arch, "");
-    base.cpu = "core2".into();
-    base.max_atomic_width = Some(128); // core2 support cmpxchg16b
+    let arch = Arch::X86_64;
+    let mut base = opts("macos", arch);
+    base.max_atomic_width = Some(128); // core2 supports cmpxchg16b
     base.frame_pointer = FramePointer::Always;
     base.add_pre_link_args(LinkerFlavor::Darwin(Cc::Yes, Lld::No), &["-m64"]);
-    base.link_env_remove.to_mut().extend(super::apple_base::macos_link_env_remove());
     base.stack_probes = StackProbeType::X86;
     base.supported_sanitizers =
         SanitizerSet::ADDRESS | SanitizerSet::CFI | SanitizerSet::LEAK | SanitizerSet::THREAD;
 
-    // Clang automatically chooses a more specific target based on
-    // MACOSX_DEPLOYMENT_TARGET.  To enable cross-language LTO to work
-    // correctly, we do too.
-    let llvm_target = super::apple_base::macos_llvm_target(&arch);
-
     Target {
-        llvm_target: llvm_target.into(),
+        // Clang automatically chooses a more specific target based on
+        // MACOSX_DEPLOYMENT_TARGET.  To enable cross-language LTO to work
+        // correctly, we do too.
+        llvm_target: macos_llvm_target(arch).into(),
         pointer_width: 64,
         data_layout: "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
             .into(),
-        arch: arch.into(),
+        arch: arch.target_arch(),
         options: TargetOptions { mcount: "\u{1}mcount".into(), ..base },
     }
 }
diff --git a/compiler/rustc_target/src/spec/x86_64_apple_ios.rs b/compiler/rustc_target/src/spec/x86_64_apple_ios.rs
index e6143025d..fbd3ebd4d 100644
--- a/compiler/rustc_target/src/spec/x86_64_apple_ios.rs
+++ b/compiler/rustc_target/src/spec/x86_64_apple_ios.rs
@@ -1,20 +1,18 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{ios_sim_llvm_target, opts, Arch};
 use crate::spec::{StackProbeType, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let base = opts("ios", Arch::X86_64);
-    let llvm_target = super::apple_base::ios_sim_llvm_target("x86_64");
-
+    let arch = Arch::X86_64_sim;
     Target {
-        llvm_target: llvm_target.into(),
+        llvm_target: ios_sim_llvm_target(arch).into(),
         pointer_width: 64,
         data_layout: "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
             .into(),
-        arch: "x86_64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             max_atomic_width: Some(64),
             stack_probes: StackProbeType::X86,
-            ..base
+            ..opts("ios", arch)
         },
     }
 }
diff --git a/compiler/rustc_target/src/spec/x86_64_apple_ios_macabi.rs b/compiler/rustc_target/src/spec/x86_64_apple_ios_macabi.rs
index 13259205a..0f3f85199 100644
--- a/compiler/rustc_target/src/spec/x86_64_apple_ios_macabi.rs
+++ b/compiler/rustc_target/src/spec/x86_64_apple_ios_macabi.rs
@@ -1,10 +1,11 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{opts, Arch};
 use crate::spec::{Cc, LinkerFlavor, Lld, StackProbeType, Target, TargetOptions};
 
 pub fn target() -> Target {
     let llvm_target = "x86_64-apple-ios13.0-macabi";
 
-    let mut base = opts("ios", Arch::X86_64_macabi);
+    let arch = Arch::X86_64_macabi;
+    let mut base = opts("ios", arch);
     base.add_pre_link_args(LinkerFlavor::Darwin(Cc::Yes, Lld::No), &["-target", llvm_target]);
 
     Target {
@@ -12,7 +13,7 @@ pub fn target() -> Target {
         pointer_width: 64,
         data_layout: "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
             .into(),
-        arch: "x86_64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             max_atomic_width: Some(64),
             stack_probes: StackProbeType::X86,
diff --git a/compiler/rustc_target/src/spec/x86_64_apple_tvos.rs b/compiler/rustc_target/src/spec/x86_64_apple_tvos.rs
index 3d54da086..550ce0b9c 100644
--- a/compiler/rustc_target/src/spec/x86_64_apple_tvos.rs
+++ b/compiler/rustc_target/src/spec/x86_64_apple_tvos.rs
@@ -1,17 +1,17 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{opts, Arch};
 use crate::spec::{StackProbeType, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let base = opts("tvos", Arch::X86_64);
+    let arch = Arch::X86_64_sim;
     Target {
         llvm_target: "x86_64-apple-tvos".into(),
         pointer_width: 64,
         data_layout: "e-m:o-i64:64-f80:128-n8:16:32:64-S128".into(),
-        arch: "x86_64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             max_atomic_width: Some(64),
             stack_probes: StackProbeType::X86,
-            ..base
+            ..opts("tvos", arch)
         },
     }
 }
diff --git a/compiler/rustc_target/src/spec/x86_64_apple_watchos_sim.rs b/compiler/rustc_target/src/spec/x86_64_apple_watchos_sim.rs
index e499b1985..75ce02cba 100644
--- a/compiler/rustc_target/src/spec/x86_64_apple_watchos_sim.rs
+++ b/compiler/rustc_target/src/spec/x86_64_apple_watchos_sim.rs
@@ -1,18 +1,14 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{opts, watchos_sim_llvm_target, Arch};
 use crate::spec::{StackProbeType, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let base = opts("watchos", Arch::X86_64);
-
-    let arch = "x86_64";
-    let llvm_target = super::apple_base::watchos_sim_llvm_target(arch);
-
+    let arch = Arch::X86_64_sim;
     Target {
-        llvm_target: llvm_target.into(),
+        llvm_target: watchos_sim_llvm_target(arch).into(),
         pointer_width: 64,
         data_layout: "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
             .into(),
-        arch: "x86_64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             max_atomic_width: Some(64),
             stack_probes: StackProbeType::X86,
@@ -28,7 +24,7 @@ pub fn target() -> Target {
                 darwinpcs\0\
                 -Os\0"
                 .into(),
-            ..base
+            ..opts("watchos", arch)
         },
     }
 }
diff --git a/compiler/rustc_target/src/spec/x86_64_pc_nto_qnx710.rs b/compiler/rustc_target/src/spec/x86_64_pc_nto_qnx710.rs
new file mode 100644
index 000000000..e9b3acee2
--- /dev/null
+++ b/compiler/rustc_target/src/spec/x86_64_pc_nto_qnx710.rs
@@ -0,0 +1,21 @@
+use super::nto_qnx_base;
+use crate::spec::{Cc, LinkerFlavor, Lld, Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "x86_64-pc-unknown".into(),
+        pointer_width: 64,
+        data_layout: "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+            .into(),
+        arch: "x86_64".into(),
+        options: TargetOptions {
+            cpu: "x86-64".into(),
+            max_atomic_width: Some(64),
+            pre_link_args: TargetOptions::link_args(
+                LinkerFlavor::Gnu(Cc::Yes, Lld::No),
+                &["-Vgcc_ntox86_64_cxx"],
+            ),
+            ..nto_qnx_base::opts()
+        },
+    }
+}
diff --git a/compiler/rustc_target/src/spec/x86_64_unknown_none_linuxkernel.rs b/compiler/rustc_target/src/spec/x86_64_unknown_none_linuxkernel.rs
deleted file mode 100644
index ebd9636ff..000000000
--- a/compiler/rustc_target/src/spec/x86_64_unknown_none_linuxkernel.rs
+++ /dev/null
@@ -1,28 +0,0 @@
-// This defines the amd64 target for the Linux Kernel. See the linux-kernel-base module for
-// generic Linux kernel options.
-
-use crate::spec::{Cc, CodeModel, LinkerFlavor, Lld, Target};
-
-pub fn target() -> Target {
-    let mut base = super::linux_kernel_base::opts();
-    base.cpu = "x86-64".into();
-    base.max_atomic_width = Some(64);
-    base.features =
-        "-mmx,-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-3dnow,-3dnowa,-avx,-avx2,+soft-float".into();
-    base.code_model = Some(CodeModel::Kernel);
-    base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-m64"]);
-
-    Target {
-        // FIXME: Some dispute, the linux-on-clang folks think this should use
-        // "Linux". We disagree because running *on* Linux is nothing like
-        // running *as" linux, and historically the "os" component as has always
-        // been used to mean the "on" part.
-        llvm_target: "x86_64-unknown-none-elf".into(),
-        pointer_width: 64,
-        data_layout: "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
-            .into(),
-        arch: "x86_64".into(),
-
-        options: base,
-    }
-}