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-rw-r--r--compiler/rustc_codegen_cranelift/src/toolchain.rs1
-rw-r--r--compiler/rustc_codegen_llvm/src/asm.rs6
-rw-r--r--compiler/rustc_codegen_ssa/src/back/link.rs1
-rw-r--r--compiler/rustc_codegen_ssa/src/back/linker.rs129
-rw-r--r--compiler/rustc_codegen_ssa/src/target_features.rs4
-rw-r--r--compiler/rustc_feature/src/active.rs1
-rw-r--r--compiler/rustc_llvm/build.rs1
-rw-r--r--compiler/rustc_llvm/src/lib.rs8
-rw-r--r--compiler/rustc_span/src/symbol.rs2
-rw-r--r--compiler/rustc_target/src/abi/call/bpf.rs31
-rw-r--r--compiler/rustc_target/src/abi/call/mod.rs2
-rw-r--r--compiler/rustc_target/src/asm/bpf.rs129
-rw-r--r--compiler/rustc_target/src/asm/mod.rs25
-rw-r--r--compiler/rustc_target/src/spec/bpf_base.rs42
-rw-r--r--compiler/rustc_target/src/spec/bpfeb_unknown_none.rs12
-rw-r--r--compiler/rustc_target/src/spec/bpfel_unknown_none.rs12
-rw-r--r--compiler/rustc_target/src/spec/mod.rs6
-rw-r--r--compiler/rustc_typeck/src/collect.rs1
18 files changed, 413 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_cranelift/src/toolchain.rs b/compiler/rustc_codegen_cranelift/src/toolchain.rs
index 484a9b699a0..49475fe2469 100644
--- a/compiler/rustc_codegen_cranelift/src/toolchain.rs
+++ b/compiler/rustc_codegen_cranelift/src/toolchain.rs
@@ -67,6 +67,7 @@ fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) {
                     LinkerFlavor::Msvc => "link.exe",
                     LinkerFlavor::Lld(_) => "lld",
                     LinkerFlavor::PtxLinker => "rust-ptx-linker",
+                    LinkerFlavor::BpfLinker => "bpf-linker",
                 }),
                 flavor,
             )),
diff --git a/compiler/rustc_codegen_llvm/src/asm.rs b/compiler/rustc_codegen_llvm/src/asm.rs
index 0aef77129d8..ecf62ed213d 100644
--- a/compiler/rustc_codegen_llvm/src/asm.rs
+++ b/compiler/rustc_codegen_llvm/src/asm.rs
@@ -288,6 +288,7 @@ impl AsmBuilderMethods<'tcx> for Builder<'a, 'll, 'tcx> {
                 InlineAsmArch::Mips | InlineAsmArch::Mips64 => {}
                 InlineAsmArch::SpirV => {}
                 InlineAsmArch::Wasm32 => {}
+                InlineAsmArch::Bpf => {}
             }
         }
         if !options.contains(InlineAsmOptions::NOMEM) {
@@ -593,6 +594,8 @@ fn reg_to_llvm(reg: InlineAsmRegOrRegClass, layout: Option<&TyAndLayout<'tcx>>)
             InlineAsmRegClass::X86(X86InlineAsmRegClass::zmm_reg) => "v",
             InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg) => "^Yk",
             InlineAsmRegClass::Wasm(WasmInlineAsmRegClass::local) => "r",
+            InlineAsmRegClass::Bpf(BpfInlineAsmRegClass::reg) => "r",
+            InlineAsmRegClass::Bpf(BpfInlineAsmRegClass::wreg) => "w",
             InlineAsmRegClass::SpirV(SpirVInlineAsmRegClass::reg) => {
                 bug!("LLVM backend does not support SPIR-V")
             }
@@ -661,6 +664,7 @@ fn modifier_to_llvm(
         },
         InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg) => None,
         InlineAsmRegClass::Wasm(WasmInlineAsmRegClass::local) => None,
+        InlineAsmRegClass::Bpf(_) => None,
         InlineAsmRegClass::SpirV(SpirVInlineAsmRegClass::reg) => {
             bug!("LLVM backend does not support SPIR-V")
         }
@@ -708,6 +712,8 @@ fn dummy_output_type(cx: &CodegenCx<'ll, 'tcx>, reg: InlineAsmRegClass) -> &'ll
         | InlineAsmRegClass::X86(X86InlineAsmRegClass::zmm_reg) => cx.type_f32(),
         InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg) => cx.type_i16(),
         InlineAsmRegClass::Wasm(WasmInlineAsmRegClass::local) => cx.type_i32(),
+        InlineAsmRegClass::Bpf(BpfInlineAsmRegClass::reg) => cx.type_i64(),
+        InlineAsmRegClass::Bpf(BpfInlineAsmRegClass::wreg) => cx.type_i32(),
         InlineAsmRegClass::SpirV(SpirVInlineAsmRegClass::reg) => {
             bug!("LLVM backend does not support SPIR-V")
         }
diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs
index 87eb51342d4..9a66d016252 100644
--- a/compiler/rustc_codegen_ssa/src/back/link.rs
+++ b/compiler/rustc_codegen_ssa/src/back/link.rs
@@ -1124,6 +1124,7 @@ fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) {
                     LinkerFlavor::Msvc => "link.exe",
                     LinkerFlavor::Lld(_) => "lld",
                     LinkerFlavor::PtxLinker => "rust-ptx-linker",
+                    LinkerFlavor::BpfLinker => "bpf-linker",
                 }),
                 flavor,
             )),
diff --git a/compiler/rustc_codegen_ssa/src/back/linker.rs b/compiler/rustc_codegen_ssa/src/back/linker.rs
index 4dc9a3f5e41..9df8a99cdd6 100644
--- a/compiler/rustc_codegen_ssa/src/back/linker.rs
+++ b/compiler/rustc_codegen_ssa/src/back/linker.rs
@@ -84,6 +84,10 @@ impl LinkerInfo {
             LinkerFlavor::PtxLinker => {
                 Box::new(PtxLinker { cmd, sess, info: self }) as Box<dyn Linker>
             }
+
+            LinkerFlavor::BpfLinker => {
+                Box::new(BpfLinker { cmd, sess, info: self }) as Box<dyn Linker>
+            }
         }
     }
 }
@@ -1431,3 +1435,128 @@ impl<'a> Linker for PtxLinker<'a> {
 
     fn linker_plugin_lto(&mut self) {}
 }
+
+pub struct BpfLinker<'a> {
+    cmd: Command,
+    sess: &'a Session,
+    info: &'a LinkerInfo,
+}
+
+impl<'a> Linker for BpfLinker<'a> {
+    fn cmd(&mut self) -> &mut Command {
+        &mut self.cmd
+    }
+
+    fn set_output_kind(&mut self, _output_kind: LinkOutputKind, _out_filename: &Path) {}
+
+    fn link_rlib(&mut self, path: &Path) {
+        self.cmd.arg(path);
+    }
+
+    fn link_whole_rlib(&mut self, path: &Path) {
+        self.cmd.arg(path);
+    }
+
+    fn include_path(&mut self, path: &Path) {
+        self.cmd.arg("-L").arg(path);
+    }
+
+    fn debuginfo(&mut self, _strip: Strip) {
+        self.cmd.arg("--debug");
+    }
+
+    fn add_object(&mut self, path: &Path) {
+        self.cmd.arg(path);
+    }
+
+    fn optimize(&mut self) {
+        self.cmd.arg(match self.sess.opts.optimize {
+            OptLevel::No => "-O0",
+            OptLevel::Less => "-O1",
+            OptLevel::Default => "-O2",
+            OptLevel::Aggressive => "-O3",
+            OptLevel::Size => "-Os",
+            OptLevel::SizeMin => "-Oz",
+        });
+    }
+
+    fn output_filename(&mut self, path: &Path) {
+        self.cmd.arg("-o").arg(path);
+    }
+
+    fn finalize(&mut self) {
+        self.cmd.arg("--cpu").arg(match self.sess.opts.cg.target_cpu {
+            Some(ref s) => s,
+            None => &self.sess.target.options.cpu,
+        });
+        self.cmd.arg("--cpu-features").arg(match &self.sess.opts.cg.target_feature {
+            feat if !feat.is_empty() => feat,
+            _ => &self.sess.target.options.features,
+        });
+    }
+
+    fn link_dylib(&mut self, _lib: Symbol, _verbatim: bool, _as_needed: bool) {
+        panic!("external dylibs not supported")
+    }
+
+    fn link_rust_dylib(&mut self, _lib: Symbol, _path: &Path) {
+        panic!("external dylibs not supported")
+    }
+
+    fn link_staticlib(&mut self, _lib: Symbol, _verbatim: bool) {
+        panic!("staticlibs not supported")
+    }
+
+    fn link_whole_staticlib(&mut self, _lib: Symbol, _verbatim: bool, _search_path: &[PathBuf]) {
+        panic!("staticlibs not supported")
+    }
+
+    fn framework_path(&mut self, _path: &Path) {
+        panic!("frameworks not supported")
+    }
+
+    fn link_framework(&mut self, _framework: Symbol, _as_needed: bool) {
+        panic!("frameworks not supported")
+    }
+
+    fn full_relro(&mut self) {}
+
+    fn partial_relro(&mut self) {}
+
+    fn no_relro(&mut self) {}
+
+    fn gc_sections(&mut self, _keep_metadata: bool) {}
+
+    fn no_gc_sections(&mut self) {}
+
+    fn pgo_gen(&mut self) {}
+
+    fn no_crt_objects(&mut self) {}
+
+    fn no_default_libraries(&mut self) {}
+
+    fn control_flow_guard(&mut self) {}
+
+    fn export_symbols(&mut self, tmpdir: &Path, crate_type: CrateType) {
+        let path = tmpdir.join("symbols");
+        let res: io::Result<()> = try {
+            let mut f = BufWriter::new(File::create(&path)?);
+            for sym in self.info.exports[&crate_type].iter() {
+                writeln!(f, "{}", sym)?;
+            }
+        };
+        if let Err(e) = res {
+            self.sess.fatal(&format!("failed to write symbols file: {}", e));
+        } else {
+            self.cmd.arg("--export-symbols").arg(&path);
+        }
+    }
+
+    fn subsystem(&mut self, _subsystem: &str) {}
+
+    fn group_start(&mut self) {}
+
+    fn group_end(&mut self) {}
+
+    fn linker_plugin_lto(&mut self) {}
+}
diff --git a/compiler/rustc_codegen_ssa/src/target_features.rs b/compiler/rustc_codegen_ssa/src/target_features.rs
index 98d550d732f..b10de567744 100644
--- a/compiler/rustc_codegen_ssa/src/target_features.rs
+++ b/compiler/rustc_codegen_ssa/src/target_features.rs
@@ -210,6 +210,8 @@ const WASM_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
     ("nontrapping-fptoint", Some(sym::wasm_target_feature)),
 ];
 
+const BPF_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[("alu32", Some(sym::bpf_target_feature))];
+
 /// When rustdoc is running, provide a list of all known features so that all their respective
 /// primitives may be documented.
 ///
@@ -224,6 +226,7 @@ pub fn all_known_features() -> impl Iterator<Item = (&'static str, Option<Symbol
         .chain(MIPS_ALLOWED_FEATURES.iter())
         .chain(RISCV_ALLOWED_FEATURES.iter())
         .chain(WASM_ALLOWED_FEATURES.iter())
+        .chain(BPF_ALLOWED_FEATURES.iter())
         .cloned()
 }
 
@@ -237,6 +240,7 @@ pub fn supported_target_features(sess: &Session) -> &'static [(&'static str, Opt
         "powerpc" | "powerpc64" => POWERPC_ALLOWED_FEATURES,
         "riscv32" | "riscv64" => RISCV_ALLOWED_FEATURES,
         "wasm32" | "wasm64" => WASM_ALLOWED_FEATURES,
+        "bpf" => BPF_ALLOWED_FEATURES,
         _ => &[],
     }
 }
diff --git a/compiler/rustc_feature/src/active.rs b/compiler/rustc_feature/src/active.rs
index 2054cd3e4c2..0359f503ef9 100644
--- a/compiler/rustc_feature/src/active.rs
+++ b/compiler/rustc_feature/src/active.rs
@@ -250,6 +250,7 @@ declare_features! (
     (active, f16c_target_feature, "1.36.0", Some(44839), None),
     (active, riscv_target_feature, "1.45.0", Some(44839), None),
     (active, ermsb_target_feature, "1.49.0", Some(44839), None),
+    (active, bpf_target_feature, "1.54.0", Some(44839), None),
 
     // -------------------------------------------------------------------------
     // feature-group-end: actual feature gates (target features)
diff --git a/compiler/rustc_llvm/build.rs b/compiler/rustc_llvm/build.rs
index 301ed639f3b..452d1b19a18 100644
--- a/compiler/rustc_llvm/build.rs
+++ b/compiler/rustc_llvm/build.rs
@@ -86,6 +86,7 @@ fn main() {
         "nvptx",
         "hexagon",
         "riscv",
+        "bpf",
     ];
 
     let required_components = &[
diff --git a/compiler/rustc_llvm/src/lib.rs b/compiler/rustc_llvm/src/lib.rs
index 555aefb1929..122627eb500 100644
--- a/compiler/rustc_llvm/src/lib.rs
+++ b/compiler/rustc_llvm/src/lib.rs
@@ -167,4 +167,12 @@ pub fn initialize_available_targets() {
         LLVMInitializeWebAssemblyAsmPrinter,
         LLVMInitializeWebAssemblyAsmParser
     );
+    init_target!(
+        llvm_component = "bpf",
+        LLVMInitializeBPFTargetInfo,
+        LLVMInitializeBPFTarget,
+        LLVMInitializeBPFTargetMC,
+        LLVMInitializeBPFAsmPrinter,
+        LLVMInitializeBPFAsmParser
+    );
 }
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index 46ef308cbf2..31b425f1a79 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -328,6 +328,7 @@ symbols! {
         box_free,
         box_patterns,
         box_syntax,
+        bpf_target_feature,
         braced_empty_structs,
         branch,
         breakpoint,
@@ -1332,6 +1333,7 @@ symbols! {
         wrapping_add,
         wrapping_mul,
         wrapping_sub,
+        wreg,
         write_bytes,
         xmm_reg,
         ymm_reg,
diff --git a/compiler/rustc_target/src/abi/call/bpf.rs b/compiler/rustc_target/src/abi/call/bpf.rs
new file mode 100644
index 00000000000..466c525531c
--- /dev/null
+++ b/compiler/rustc_target/src/abi/call/bpf.rs
@@ -0,0 +1,31 @@
+// see https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/BPF/BPFCallingConv.td
+use crate::abi::call::{ArgAbi, FnAbi};
+
+fn classify_ret<Ty>(ret: &mut ArgAbi<'_, Ty>) {
+    if ret.layout.is_aggregate() || ret.layout.size.bits() > 64 {
+        ret.make_indirect();
+    } else {
+        ret.extend_integer_width_to(32);
+    }
+}
+
+fn classify_arg<Ty>(arg: &mut ArgAbi<'_, Ty>) {
+    if arg.layout.is_aggregate() || arg.layout.size.bits() > 64 {
+        arg.make_indirect();
+    } else {
+        arg.extend_integer_width_to(32);
+    }
+}
+
+pub fn compute_abi_info<Ty>(fn_abi: &mut FnAbi<'_, Ty>) {
+    if !fn_abi.ret.is_ignore() {
+        classify_ret(&mut fn_abi.ret);
+    }
+
+    for arg in &mut fn_abi.args {
+        if arg.is_ignore() {
+            continue;
+        }
+        classify_arg(arg);
+    }
+}
diff --git a/compiler/rustc_target/src/abi/call/mod.rs b/compiler/rustc_target/src/abi/call/mod.rs
index 0cf2441d84e..6e0e1403740 100644
--- a/compiler/rustc_target/src/abi/call/mod.rs
+++ b/compiler/rustc_target/src/abi/call/mod.rs
@@ -6,6 +6,7 @@ mod aarch64;
 mod amdgpu;
 mod arm;
 mod avr;
+mod bpf;
 mod hexagon;
 mod mips;
 mod mips64;
@@ -654,6 +655,7 @@ impl<'a, Ty> FnAbi<'a, Ty> {
                 }
             }
             "asmjs" => wasm::compute_c_abi_info(cx, self),
+            "bpf" => bpf::compute_abi_info(self),
             a => return Err(format!("unrecognized arch \"{}\" in target specification", a)),
         }
 
diff --git a/compiler/rustc_target/src/asm/bpf.rs b/compiler/rustc_target/src/asm/bpf.rs
new file mode 100644
index 00000000000..ecb6bdc95ce
--- /dev/null
+++ b/compiler/rustc_target/src/asm/bpf.rs
@@ -0,0 +1,129 @@
+use super::{InlineAsmArch, InlineAsmType, Target};
+use rustc_macros::HashStable_Generic;
+use std::fmt;
+
+def_reg_class! {
+    Bpf BpfInlineAsmRegClass {
+        reg,
+        wreg,
+    }
+}
+
+impl BpfInlineAsmRegClass {
+    pub fn valid_modifiers(self, _arch: InlineAsmArch) -> &'static [char] {
+        &[]
+    }
+
+    pub fn suggest_class(self, _arch: InlineAsmArch, _ty: InlineAsmType) -> Option<Self> {
+        None
+    }
+
+    pub fn suggest_modifier(
+        self,
+        _arch: InlineAsmArch,
+        _ty: InlineAsmType,
+    ) -> Option<(char, &'static str)> {
+        None
+    }
+
+    pub fn default_modifier(self, _arch: InlineAsmArch) -> Option<(char, &'static str)> {
+        None
+    }
+
+    pub fn supported_types(
+        self,
+        _arch: InlineAsmArch,
+    ) -> &'static [(InlineAsmType, Option<&'static str>)] {
+        match self {
+            Self::reg => types! { _: I8, I16, I32, I64; },
+            Self::wreg => types! { "alu32": I8, I16, I32; },
+        }
+    }
+}
+
+fn only_alu32(
+    _arch: InlineAsmArch,
+    mut has_feature: impl FnMut(&str) -> bool,
+    _target: &Target,
+) -> Result<(), &'static str> {
+    if !has_feature("alu32") {
+        Err("register can't be used without the `alu32` target feature")
+    } else {
+        Ok(())
+    }
+}
+
+def_regs! {
+    Bpf BpfInlineAsmReg BpfInlineAsmRegClass {
+        r0: reg = ["r0"],
+        r1: reg = ["r1"],
+        r2: reg = ["r2"],
+        r3: reg = ["r3"],
+        r4: reg = ["r4"],
+        r5: reg = ["r5"],
+        r6: reg = ["r6"],
+        r7: reg = ["r7"],
+        r8: reg = ["r8"],
+        r9: reg = ["r9"],
+        w0: wreg = ["w0"] % only_alu32,
+        w1: wreg = ["w1"] % only_alu32,
+        w2: wreg = ["w2"] % only_alu32,
+        w3: wreg = ["w3"] % only_alu32,
+        w4: wreg = ["w4"] % only_alu32,
+        w5: wreg = ["w5"] % only_alu32,
+        w6: wreg = ["w6"] % only_alu32,
+        w7: wreg = ["w7"] % only_alu32,
+        w8: wreg = ["w8"] % only_alu32,
+        w9: wreg = ["w9"] % only_alu32,
+
+        #error = ["r10", "w10"] =>
+            "the stack pointer cannot be used as an operand for inline asm",
+    }
+}
+
+impl BpfInlineAsmReg {
+    pub fn emit(
+        self,
+        out: &mut dyn fmt::Write,
+        _arch: InlineAsmArch,
+        _modifier: Option<char>,
+    ) -> fmt::Result {
+        out.write_str(self.name())
+    }
+
+    pub fn overlapping_regs(self, mut cb: impl FnMut(BpfInlineAsmReg)) {
+        cb(self);
+
+        macro_rules! reg_conflicts {
+            (
+                $(
+                    $r:ident : $w:ident
+                ),*
+            ) => {
+                match self {
+                    $(
+                        Self::$r => {
+                            cb(Self::$w);
+                        }
+                        Self::$w => {
+                            cb(Self::$r);
+                        }
+                    )*
+                }
+            };
+        }
+
+        reg_conflicts! {
+            r0 : w0,
+            r1 : w1,
+            r2 : w2,
+            r3 : w3,
+            r4 : w4,
+            r5 : w5,
+            r6 : w6,
+            r7 : w7,
+            r8 : w8,
+            r9 : w9
+        }
+    }
+}
diff --git a/compiler/rustc_target/src/asm/mod.rs b/compiler/rustc_target/src/asm/mod.rs
index c17c2961434..305ea7d50e6 100644
--- a/compiler/rustc_target/src/asm/mod.rs
+++ b/compiler/rustc_target/src/asm/mod.rs
@@ -148,6 +148,7 @@ macro_rules! types {
 
 mod aarch64;
 mod arm;
+mod bpf;
 mod hexagon;
 mod mips;
 mod nvptx;
@@ -159,6 +160,7 @@ mod x86;
 
 pub use aarch64::{AArch64InlineAsmReg, AArch64InlineAsmRegClass};
 pub use arm::{ArmInlineAsmReg, ArmInlineAsmRegClass};
+pub use bpf::{BpfInlineAsmReg, BpfInlineAsmRegClass};
 pub use hexagon::{HexagonInlineAsmReg, HexagonInlineAsmRegClass};
 pub use mips::{MipsInlineAsmReg, MipsInlineAsmRegClass};
 pub use nvptx::{NvptxInlineAsmReg, NvptxInlineAsmRegClass};
@@ -184,6 +186,7 @@ pub enum InlineAsmArch {
     PowerPC64,
     SpirV,
     Wasm32,
+    Bpf,
 }
 
 impl FromStr for InlineAsmArch {
@@ -205,6 +208,7 @@ impl FromStr for InlineAsmArch {
             "mips64" => Ok(Self::Mips64),
             "spirv" => Ok(Self::SpirV),
             "wasm32" => Ok(Self::Wasm32),
+            "bpf" => Ok(Self::Bpf),
             _ => Err(()),
         }
     }
@@ -233,6 +237,7 @@ pub enum InlineAsmReg {
     Mips(MipsInlineAsmReg),
     SpirV(SpirVInlineAsmReg),
     Wasm(WasmInlineAsmReg),
+    Bpf(BpfInlineAsmReg),
     // Placeholder for invalid register constraints for the current target
     Err,
 }
@@ -247,6 +252,7 @@ impl InlineAsmReg {
             Self::PowerPC(r) => r.name(),
             Self::Hexagon(r) => r.name(),
             Self::Mips(r) => r.name(),
+            Self::Bpf(r) => r.name(),
             Self::Err => "<reg>",
         }
     }
@@ -260,6 +266,7 @@ impl InlineAsmReg {
             Self::PowerPC(r) => InlineAsmRegClass::PowerPC(r.reg_class()),
             Self::Hexagon(r) => InlineAsmRegClass::Hexagon(r.reg_class()),
             Self::Mips(r) => InlineAsmRegClass::Mips(r.reg_class()),
+            Self::Bpf(r) => InlineAsmRegClass::Bpf(r.reg_class()),
             Self::Err => InlineAsmRegClass::Err,
         }
     }
@@ -304,6 +311,9 @@ impl InlineAsmReg {
             InlineAsmArch::Wasm32 => {
                 Self::Wasm(WasmInlineAsmReg::parse(arch, has_feature, target, &name)?)
             }
+            InlineAsmArch::Bpf => {
+                Self::Bpf(BpfInlineAsmReg::parse(arch, has_feature, target, &name)?)
+            }
         })
     }
 
@@ -323,6 +333,7 @@ impl InlineAsmReg {
             Self::PowerPC(r) => r.emit(out, arch, modifier),
             Self::Hexagon(r) => r.emit(out, arch, modifier),
             Self::Mips(r) => r.emit(out, arch, modifier),
+            Self::Bpf(r) => r.emit(out, arch, modifier),
             Self::Err => unreachable!("Use of InlineAsmReg::Err"),
         }
     }
@@ -336,6 +347,7 @@ impl InlineAsmReg {
             Self::PowerPC(_) => cb(self),
             Self::Hexagon(r) => r.overlapping_regs(|r| cb(Self::Hexagon(r))),
             Self::Mips(_) => cb(self),
+            Self::Bpf(r) => r.overlapping_regs(|r| cb(Self::Bpf(r))),
             Self::Err => unreachable!("Use of InlineAsmReg::Err"),
         }
     }
@@ -364,6 +376,7 @@ pub enum InlineAsmRegClass {
     Mips(MipsInlineAsmRegClass),
     SpirV(SpirVInlineAsmRegClass),
     Wasm(WasmInlineAsmRegClass),
+    Bpf(BpfInlineAsmRegClass),
     // Placeholder for invalid register constraints for the current target
     Err,
 }
@@ -381,6 +394,7 @@ impl InlineAsmRegClass {
             Self::Mips(r) => r.name(),
             Self::SpirV(r) => r.name(),
             Self::Wasm(r) => r.name(),
+            Self::Bpf(r) => r.name(),
             Self::Err => rustc_span::symbol::sym::reg,
         }
     }
@@ -400,6 +414,7 @@ impl InlineAsmRegClass {
             Self::Mips(r) => r.suggest_class(arch, ty).map(InlineAsmRegClass::Mips),
             Self::SpirV(r) => r.suggest_class(arch, ty).map(InlineAsmRegClass::SpirV),
             Self::Wasm(r) => r.suggest_class(arch, ty).map(InlineAsmRegClass::Wasm),
+            Self::Bpf(r) => r.suggest_class(arch, ty).map(InlineAsmRegClass::Bpf),
             Self::Err => unreachable!("Use of InlineAsmRegClass::Err"),
         }
     }
@@ -426,6 +441,7 @@ impl InlineAsmRegClass {
             Self::Mips(r) => r.suggest_modifier(arch, ty),
             Self::SpirV(r) => r.suggest_modifier(arch, ty),
             Self::Wasm(r) => r.suggest_modifier(arch, ty),
+            Self::Bpf(r) => r.suggest_modifier(arch, ty),
             Self::Err => unreachable!("Use of InlineAsmRegClass::Err"),
         }
     }
@@ -448,6 +464,7 @@ impl InlineAsmRegClass {
             Self::Mips(r) => r.default_modifier(arch),
             Self::SpirV(r) => r.default_modifier(arch),
             Self::Wasm(r) => r.default_modifier(arch),
+            Self::Bpf(r) => r.default_modifier(arch),
             Self::Err => unreachable!("Use of InlineAsmRegClass::Err"),
         }
     }
@@ -469,6 +486,7 @@ impl InlineAsmRegClass {
             Self::Mips(r) => r.supported_types(arch),
             Self::SpirV(r) => r.supported_types(arch),
             Self::Wasm(r) => r.supported_types(arch),
+            Self::Bpf(r) => r.supported_types(arch),
             Self::Err => unreachable!("Use of InlineAsmRegClass::Err"),
         }
     }
@@ -493,6 +511,7 @@ impl InlineAsmRegClass {
             }
             InlineAsmArch::SpirV => Self::SpirV(SpirVInlineAsmRegClass::parse(arch, name)?),
             InlineAsmArch::Wasm32 => Self::Wasm(WasmInlineAsmRegClass::parse(arch, name)?),
+            InlineAsmArch::Bpf => Self::Bpf(BpfInlineAsmRegClass::parse(arch, name)?),
         })
     }
 
@@ -510,6 +529,7 @@ impl InlineAsmRegClass {
             Self::Mips(r) => r.valid_modifiers(arch),
             Self::SpirV(r) => r.valid_modifiers(arch),
             Self::Wasm(r) => r.valid_modifiers(arch),
+            Self::Bpf(r) => r.valid_modifiers(arch),
             Self::Err => unreachable!("Use of InlineAsmRegClass::Err"),
         }
     }
@@ -679,5 +699,10 @@ pub fn allocatable_registers(
             wasm::fill_reg_map(arch, has_feature, target, &mut map);
             map
         }
+        InlineAsmArch::Bpf => {
+            let mut map = bpf::regclass_map();
+            bpf::fill_reg_map(arch, has_feature, target, &mut map);
+            map
+        }
     }
 }
diff --git a/compiler/rustc_target/src/spec/bpf_base.rs b/compiler/rustc_target/src/spec/bpf_base.rs
new file mode 100644
index 00000000000..764cc735d75
--- /dev/null
+++ b/compiler/rustc_target/src/spec/bpf_base.rs
@@ -0,0 +1,42 @@
+use crate::spec::{LinkerFlavor, MergeFunctions, PanicStrategy, TargetOptions};
+use crate::{abi::Endian, spec::abi::Abi};
+
+pub fn opts(endian: Endian) -> TargetOptions {
+    TargetOptions {
+        allow_asm: true,
+        endian,
+        linker_flavor: LinkerFlavor::BpfLinker,
+        atomic_cas: false,
+        executables: true,
+        dynamic_linking: true,
+        no_builtins: true,
+        panic_strategy: PanicStrategy::Abort,
+        position_independent_executables: true,
+        // Disable MergeFunctions since:
+        // - older kernels don't support bpf-to-bpf calls
+        // - on newer kernels, userspace still needs to relocate before calling
+        //   BPF_PROG_LOAD and not all BPF libraries do that yet
+        merge_functions: MergeFunctions::Disabled,
+        obj_is_bitcode: true,
+        requires_lto: false,
+        singlethread: true,
+        max_atomic_width: Some(64),
+        unsupported_abis: vec![
+            Abi::Cdecl,
+            Abi::Stdcall { unwind: false },
+            Abi::Stdcall { unwind: true },
+            Abi::Fastcall,
+            Abi::Vectorcall,
+            Abi::Thiscall { unwind: false },
+            Abi::Thiscall { unwind: true },
+            Abi::Aapcs,
+            Abi::Win64,
+            Abi::SysV64,
+            Abi::PtxKernel,
+            Abi::Msp430Interrupt,
+            Abi::X86Interrupt,
+            Abi::AmdGpuKernel,
+        ],
+        ..Default::default()
+    }
+}
diff --git a/compiler/rustc_target/src/spec/bpfeb_unknown_none.rs b/compiler/rustc_target/src/spec/bpfeb_unknown_none.rs
new file mode 100644
index 00000000000..a45da82eb40
--- /dev/null
+++ b/compiler/rustc_target/src/spec/bpfeb_unknown_none.rs
@@ -0,0 +1,12 @@
+use crate::spec::Target;
+use crate::{abi::Endian, spec::bpf_base};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "bpfeb".to_string(),
+        data_layout: "E-m:e-p:64:64-i64:64-i128:128-n32:64-S128".to_string(),
+        pointer_width: 64,
+        arch: "bpf".to_string(),
+        options: bpf_base::opts(Endian::Big),
+    }
+}
diff --git a/compiler/rustc_target/src/spec/bpfel_unknown_none.rs b/compiler/rustc_target/src/spec/bpfel_unknown_none.rs
new file mode 100644
index 00000000000..6c9afdf35ae
--- /dev/null
+++ b/compiler/rustc_target/src/spec/bpfel_unknown_none.rs
@@ -0,0 +1,12 @@
+use crate::spec::Target;
+use crate::{abi::Endian, spec::bpf_base};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "bpfel".to_string(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".to_string(),
+        pointer_width: 64,
+        arch: "bpf".to_string(),
+        options: bpf_base::opts(Endian::Little),
+    }
+}
diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index 4683def94f7..0f2aaeb533a 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -57,6 +57,7 @@ mod apple_base;
 mod apple_sdk_base;
 mod arm_base;
 mod avr_gnu_base;
+mod bpf_base;
 mod dragonfly_base;
 mod freebsd_base;
 mod fuchsia_base;
@@ -93,6 +94,7 @@ pub enum LinkerFlavor {
     Msvc,
     Lld(LldFlavor),
     PtxLinker,
+    BpfLinker,
 }
 
 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
@@ -161,6 +163,7 @@ flavor_mappings! {
     ((LinkerFlavor::Ld), "ld"),
     ((LinkerFlavor::Msvc), "msvc"),
     ((LinkerFlavor::PtxLinker), "ptx-linker"),
+    ((LinkerFlavor::BpfLinker), "bpf-linker"),
     ((LinkerFlavor::Lld(LldFlavor::Wasm)), "wasm-ld"),
     ((LinkerFlavor::Lld(LldFlavor::Ld64)), "ld64.lld"),
     ((LinkerFlavor::Lld(LldFlavor::Ld)), "ld.lld"),
@@ -897,6 +900,9 @@ supported_targets! {
     ("aarch64_be-unknown-linux-gnu", aarch64_be_unknown_linux_gnu),
     ("aarch64-unknown-linux-gnu_ilp32", aarch64_unknown_linux_gnu_ilp32),
     ("aarch64_be-unknown-linux-gnu_ilp32", aarch64_be_unknown_linux_gnu_ilp32),
+
+    ("bpfeb-unknown-none", bpfeb_unknown_none),
+    ("bpfel-unknown-none", bpfel_unknown_none),
 }
 
 /// Everything `rustc` knows about how to compile for a specific target.
diff --git a/compiler/rustc_typeck/src/collect.rs b/compiler/rustc_typeck/src/collect.rs
index 5d83375e5a1..f5ee4b21ea6 100644
--- a/compiler/rustc_typeck/src/collect.rs
+++ b/compiler/rustc_typeck/src/collect.rs
@@ -2597,6 +2597,7 @@ fn from_target_feature(
                 Some(sym::rtm_target_feature) => rust_features.rtm_target_feature,
                 Some(sym::f16c_target_feature) => rust_features.f16c_target_feature,
                 Some(sym::ermsb_target_feature) => rust_features.ermsb_target_feature,
+                Some(sym::bpf_target_feature) => rust_features.bpf_target_feature,
                 Some(name) => bug!("unknown target feature gate {}", name),
                 None => true,
             };
generated by cgit-pink 1.4.1-3-g733a5 (git 2.37.1) at 2026-01-14 04:45:20 +0000