Auto merge of #38726 - japaric:sparc64, r=sanxiyn

sparc64-linux support

This is built on top of #38656 and depends on rust-lang/libc#483

Hello world works.

The libc-test test suite passes.

`panic!` doesn't fully work:

```
$ qemu-sparc64-static ./panic
thread 'main' panicked at 'explicit panic', panic.rs:1
note: Run with `RUST_BACKTRACE=1` for a backtrace.
Illegal instruction (core dumped)
```

Backtraces don't work either, probably related to the previous point:

```
$ export RUST_BACKTRACE=1
$ qemu-sparc64-static ./panic
thread 'main' panicked at 'explicit panic', panic.rs:1
stack backtrace:
Illegal instruction (core dumped)
```

r? @alexcrichton

@jakllsch Does panicking / backtraces work on sparc64-netbsd?

cc @glaubitz

19 files changed, 290 insertions, 11 deletions

diff --git a/configure b/configure
index 5094e5a764b..beb0a9d43a0 100755
--- a/configure
+++ b/configure
@@ -1822,7 +1822,7 @@ do
         CMAKE_ARGS="$CMAKE_ARGS -DLLVM_ENABLE_ASSERTIONS=ON"
     fi
 
-    CMAKE_ARGS="$CMAKE_ARGS -DLLVM_TARGETS_TO_BUILD='X86;ARM;AArch64;Mips;PowerPC;SystemZ;JSBackend;MSP430'"
+    CMAKE_ARGS="$CMAKE_ARGS -DLLVM_TARGETS_TO_BUILD='X86;ARM;AArch64;Mips;PowerPC;SystemZ;JSBackend;MSP430;Sparc'"
     CMAKE_ARGS="$CMAKE_ARGS -G '$CFG_CMAKE_GENERATOR'"
     CMAKE_ARGS="$CMAKE_ARGS $CFG_LLVM_SRC_DIR"
 
diff --git a/mk/cfg/sparc64-unknown-linux-gnu.mk b/mk/cfg/sparc64-unknown-linux-gnu.mk
new file mode 100644
index 00000000000..34aee77ae21
--- /dev/null
+++ b/mk/cfg/sparc64-unknown-linux-gnu.mk
@@ -0,0 +1 @@
+# rustbuild-only target
diff --git a/mk/cfg/sparc64-unknown-netbsd.mk b/mk/cfg/sparc64-unknown-netbsd.mk
new file mode 100644
index 00000000000..a2b01ba0537
--- /dev/null
+++ b/mk/cfg/sparc64-unknown-netbsd.mk
@@ -0,0 +1,3 @@
+# This file is intentially left empty to indicate that, while this target is
+# supported, it's not supported using plain GNU Make builds. Use a --rustbuild
+# instead.
diff --git a/mk/main.mk b/mk/main.mk
index d01ec07b424..2c646450d01 100644
--- a/mk/main.mk
+++ b/mk/main.mk
@@ -285,7 +285,7 @@ endif
 # LLVM macros
 ######################################################################
 
-LLVM_OPTIONAL_COMPONENTS=x86 arm aarch64 mips powerpc pnacl systemz jsbackend msp430
+LLVM_OPTIONAL_COMPONENTS=x86 arm aarch64 mips powerpc pnacl systemz jsbackend msp430 sparc
 LLVM_REQUIRED_COMPONENTS=ipo bitreader bitwriter linker asmparser mcjit \
                 interpreter instrumentation
 
diff --git a/src/liballoc_jemalloc/build.rs b/src/liballoc_jemalloc/build.rs
index 2bbec9e5fc2..1edcb0b1f24 100644
--- a/src/liballoc_jemalloc/build.rs
+++ b/src/liballoc_jemalloc/build.rs
@@ -151,6 +151,12 @@ fn main() {
     cmd.arg(format!("--host={}", build_helper::gnu_target(&target)));
     cmd.arg(format!("--build={}", build_helper::gnu_target(&host)));
 
+    // for some reason, jemalloc configure doesn't detect this value
+    // automatically for this target
+    if target == "sparc64-unknown-linux-gnu" {
+        cmd.arg("--with-lg-quantum=4");
+    }
+
     run(&mut cmd);
     let mut make = Command::new(build_helper::make(&host));
     make.current_dir(&build_dir)
diff --git a/src/liballoc_jemalloc/lib.rs b/src/liballoc_jemalloc/lib.rs
index 21e45f9c4b2..f2df393ad77 100644
--- a/src/liballoc_jemalloc/lib.rs
+++ b/src/liballoc_jemalloc/lib.rs
@@ -84,7 +84,8 @@ mod imp {
                   target_arch = "aarch64",
                   target_arch = "powerpc64",
                   target_arch = "mips64",
-                  target_arch = "s390x")))]
+                  target_arch = "s390x",
+                  target_arch = "sparc64")))]
     const MIN_ALIGN: usize = 16;
 
     // MALLOCX_ALIGN(a) macro
diff --git a/src/liballoc_system/lib.rs b/src/liballoc_system/lib.rs
index 4daa6cbb846..5f0b637656b 100644
--- a/src/liballoc_system/lib.rs
+++ b/src/liballoc_system/lib.rs
@@ -35,7 +35,8 @@ const MIN_ALIGN: usize = 8;
 #[cfg(all(any(target_arch = "x86_64",
               target_arch = "aarch64",
               target_arch = "mips64",
-              target_arch = "s390x")))]
+              target_arch = "s390x",
+              target_arch = "sparc64")))]
 const MIN_ALIGN: usize = 16;
 
 #[no_mangle]
diff --git a/src/liblibc b/src/liblibc
-Subproject e49e9bb7c3d9c7f2fd893f0ee0db81617b8db21
+Subproject 98589876259e19f13eab81b033ced95bbb6deca
diff --git a/src/libpanic_unwind/gcc.rs b/src/libpanic_unwind/gcc.rs
index 73264fab69c..e8b3a9a42c2 100644
--- a/src/libpanic_unwind/gcc.rs
+++ b/src/libpanic_unwind/gcc.rs
@@ -133,6 +133,9 @@ const UNWIND_DATA_REG: (i32, i32) = (3, 4); // R3, R4 / X3, X4
 #[cfg(target_arch = "s390x")]
 const UNWIND_DATA_REG: (i32, i32) = (6, 7); // R6, R7
 
+#[cfg(target_arch = "sparc64")]
+const UNWIND_DATA_REG: (i32, i32) = (24, 25); // I0, I1
+
 // The following code is based on GCC's C and C++ personality routines.  For reference, see:
 // https://github.com/gcc-mirror/gcc/blob/master/libstdc++-v3/libsupc++/eh_personality.cc
 // https://github.com/gcc-mirror/gcc/blob/trunk/libgcc/unwind-c.c
diff --git a/src/librustc_back/target/mod.rs b/src/librustc_back/target/mod.rs
index 9616cc77e35..5afa85d1552 100644
--- a/src/librustc_back/target/mod.rs
+++ b/src/librustc_back/target/mod.rs
@@ -158,6 +158,8 @@ supported_targets! {
     ("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),
     ("mipsel-unknown-linux-uclibc", mipsel_unknown_linux_uclibc),
 
+    ("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
+
     ("i686-linux-android", i686_linux_android),
     ("arm-linux-androideabi", arm_linux_androideabi),
     ("armv7-linux-androideabi", armv7_linux_androideabi),
@@ -174,6 +176,7 @@ supported_targets! {
     ("i686-unknown-openbsd", i686_unknown_openbsd),
     ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
 
+    ("sparc64-unknown-netbsd", sparc64_unknown_netbsd),
     ("x86_64-unknown-netbsd", x86_64_unknown_netbsd),
     ("x86_64-rumprun-netbsd", x86_64_rumprun_netbsd),
 
diff --git a/src/librustc_back/target/sparc64_unknown_linux_gnu.rs b/src/librustc_back/target/sparc64_unknown_linux_gnu.rs
new file mode 100644
index 00000000000..f627cc18f0b
--- /dev/null
+++ b/src/librustc_back/target/sparc64_unknown_linux_gnu.rs
@@ -0,0 +1,30 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use target::{Target, TargetResult};
+
+pub fn target() -> TargetResult {
+    let mut base = super::linux_base::opts();
+    base.cpu = "v9".to_string();
+    base.max_atomic_width = Some(64);
+    base.exe_allocation_crate = "alloc_system".to_string();
+
+    Ok(Target {
+        llvm_target: "sparc64-unknown-linux-gnu".to_string(),
+        target_endian: "big".to_string(),
+        target_pointer_width: "64".to_string(),
+        data_layout: "E-m:e-i64:64-n32:64-S128".to_string(),
+        arch: "sparc64".to_string(),
+        target_os: "linux".to_string(),
+        target_env: "gnu".to_string(),
+        target_vendor: "unknown".to_string(),
+        options: base,
+    })
+}
diff --git a/src/librustc_back/target/sparc64_unknown_netbsd.rs b/src/librustc_back/target/sparc64_unknown_netbsd.rs
new file mode 100644
index 00000000000..f30cebbc2d5
--- /dev/null
+++ b/src/librustc_back/target/sparc64_unknown_netbsd.rs
@@ -0,0 +1,30 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use target::{Target, TargetResult};
+
+pub fn target() -> TargetResult {
+    let mut base = super::netbsd_base::opts();
+    base.cpu = "v9".to_string();
+    base.pre_link_args.push("-m64".to_string());
+    base.max_atomic_width = Some(64);
+
+    Ok(Target {
+        llvm_target: "sparc64-unknown-netbsd".to_string(),
+        target_endian: "big".to_string(),
+        target_pointer_width: "64".to_string(),
+        data_layout: "E-m:e-i64:64-n32:64-S128".to_string(),
+        arch: "sparc64".to_string(),
+        target_os: "netbsd".to_string(),
+        target_env: "".to_string(),
+        target_vendor: "unknown".to_string(),
+        options: base,
+    })
+}
diff --git a/src/librustc_trans/abi.rs b/src/librustc_trans/abi.rs
index 65e752232f6..b3eec5d66c4 100644
--- a/src/librustc_trans/abi.rs
+++ b/src/librustc_trans/abi.rs
@@ -25,6 +25,7 @@ use cabi_mips64;
 use cabi_asmjs;
 use cabi_msp430;
 use cabi_sparc;
+use cabi_sparc64;
 use cabi_nvptx;
 use cabi_nvptx64;
 use machine::{llalign_of_min, llsize_of, llsize_of_alloc};
@@ -614,6 +615,7 @@ impl FnType {
             "wasm32" => cabi_asmjs::compute_abi_info(ccx, self),
             "msp430" => cabi_msp430::compute_abi_info(ccx, self),
             "sparc" => cabi_sparc::compute_abi_info(ccx, self),
+            "sparc64" => cabi_sparc64::compute_abi_info(ccx, self),
             "nvptx" => cabi_nvptx::compute_abi_info(ccx, self),
             "nvptx64" => cabi_nvptx64::compute_abi_info(ccx, self),
             a => ccx.sess().fatal(&format!("unrecognized arch \"{}\" in target specification", a))
diff --git a/src/librustc_trans/cabi_sparc64.rs b/src/librustc_trans/cabi_sparc64.rs
new file mode 100644
index 00000000000..e675cca33d1
--- /dev/null
+++ b/src/librustc_trans/cabi_sparc64.rs
@@ -0,0 +1,185 @@
+// Copyright 2014-2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// FIXME: This needs an audit for correctness and completeness.
+
+use llvm::{Integer, Pointer, Float, Double, Struct, Vector, Array};
+use abi::{self, FnType, ArgType};
+use context::CrateContext;
+use type_::Type;
+
+fn ty_size(ty: Type) -> usize {
+    if ty.kind() == Vector {
+        bug!("ty_size: unhandled type")
+    } else {
+        abi::ty_size(ty, 8)
+    }
+}
+
+fn is_homogenous_aggregate_ty(ty: Type) -> Option<(Type, u64)> {
+    fn check_array(ty: Type) -> Option<(Type, u64)> {
+        let len = ty.array_length() as u64;
+        if len == 0 {
+            return None
+        }
+        let elt = ty.element_type();
+
+        // if our element is an HFA/HVA, so are we; multiply members by our len
+        is_homogenous_aggregate_ty(elt).map(|(base_ty, members)| (base_ty, len * members))
+    }
+
+    fn check_struct(ty: Type) -> Option<(Type, u64)> {
+        let str_tys = ty.field_types();
+        if str_tys.len() == 0 {
+            return None
+        }
+
+        let mut prev_base_ty = None;
+        let mut members = 0;
+        for opt_homog_agg in str_tys.iter().map(|t| is_homogenous_aggregate_ty(*t)) {
+            match (prev_base_ty, opt_homog_agg) {
+                // field isn't itself an HFA, so we aren't either
+                (_, None) => return None,
+
+                // first field - store its type and number of members
+                (None, Some((field_ty, field_members))) => {
+                    prev_base_ty = Some(field_ty);
+                    members = field_members;
+                },
+
+                // 2nd or later field - give up if it's a different type; otherwise incr. members
+                (Some(prev_ty), Some((field_ty, field_members))) => {
+                    if prev_ty != field_ty {
+                        return None;
+                    }
+                    members += field_members;
+                }
+            }
+        }
+
+        // Because of previous checks, we know prev_base_ty is Some(...) because
+        //   1. str_tys has at least one element; and
+        //   2. prev_base_ty was filled in (or we would've returned early)
+        let (base_ty, members) = (prev_base_ty.unwrap(), members);
+
+        // Ensure there is no padding.
+        if ty_size(ty) == ty_size(base_ty) * (members as usize) {
+            Some((base_ty, members))
+        } else {
+            None
+        }
+    }
+
+    let homog_agg = match ty.kind() {
+        Float  => Some((ty, 1)),
+        Double => Some((ty, 1)),
+        Array  => check_array(ty),
+        Struct => check_struct(ty),
+        _ => None
+    };
+
+    // Ensure we have at most eight uniquely addressable members
+    homog_agg.and_then(|(base_ty, members)| {
+        if members > 0 && members <= 8 {
+            Some((base_ty, members))
+        } else {
+            None
+        }
+    })
+}
+
+fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
+    if is_reg_ty(ret.ty) {
+        ret.extend_integer_width_to(64);
+        return;
+    }
+
+    // don't return aggregates in registers
+    ret.make_indirect(ccx);
+
+    if let Some((base_ty, members)) = is_homogenous_aggregate_ty(ret.ty) {
+        ret.cast = Some(Type::array(&base_ty, members));
+        return;
+    }
+    let size = ty_size(ret.ty);
+    if size <= 16 {
+        let llty = if size <= 1 {
+            Type::i8(ccx)
+        } else if size <= 2 {
+            Type::i16(ccx)
+        } else if size <= 4 {
+            Type::i32(ccx)
+        } else if size <= 8 {
+            Type::i64(ccx)
+        } else {
+            Type::array(&Type::i64(ccx), ((size + 7 ) / 8 ) as u64)
+        };
+        ret.cast = Some(llty);
+        return;
+    }
+}
+
+fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
+    if is_reg_ty(arg.ty) {
+        arg.extend_integer_width_to(64);
+        return;
+    }
+
+    if let Some((base_ty, members)) = is_homogenous_aggregate_ty(arg.ty) {
+        arg.cast = Some(Type::array(&base_ty, members));
+        return;
+    }
+
+    arg.cast = Some(struct_ty(ccx, arg.ty));
+}
+
+fn is_reg_ty(ty: Type) -> bool {
+    match ty.kind() {
+        Integer
+        | Pointer
+        | Float
+        | Double => true,
+        _ => false
+    }
+}
+
+fn coerce_to_long(ccx: &CrateContext, size: usize) -> Vec<Type> {
+    let long_ty = Type::i64(ccx);
+    let mut args = Vec::new();
+
+    let mut n = size / 64;
+    while n > 0 {
+        args.push(long_ty);
+        n -= 1;
+    }
+
+    let r = size % 64;
+    if r > 0 {
+        args.push(Type::ix(ccx, r as u64));
+    }
+
+    args
+}
+
+fn struct_ty(ccx: &CrateContext, ty: Type) -> Type {
+    let size = ty_size(ty) * 8;
+    Type::struct_(ccx, &coerce_to_long(ccx, size), false)
+}
+
+pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+    if !fty.ret.is_ignore() {
+        classify_ret_ty(ccx, &mut fty.ret);
+    }
+
+    for arg in &mut fty.args {
+        if arg.is_ignore() { continue; }
+        classify_arg_ty(ccx, arg);
+    }
+}
diff --git a/src/librustc_trans/lib.rs b/src/librustc_trans/lib.rs
index 11bfa0d76c3..3a4171e1d0e 100644
--- a/src/librustc_trans/lib.rs
+++ b/src/librustc_trans/lib.rs
@@ -110,6 +110,7 @@ mod cabi_powerpc;
 mod cabi_powerpc64;
 mod cabi_s390x;
 mod cabi_sparc;
+mod cabi_sparc64;
 mod cabi_x86;
 mod cabi_x86_64;
 mod cabi_x86_win64;
diff --git a/src/libstd/env.rs b/src/libstd/env.rs
index 0521f301321..d843d97420a 100644
--- a/src/libstd/env.rs
+++ b/src/libstd/env.rs
@@ -712,6 +712,7 @@ pub mod consts {
     /// - powerpc
     /// - powerpc64
     /// - s390x
+    /// - sparc64
     #[stable(feature = "env", since = "1.0.0")]
     pub const ARCH: &'static str = super::arch::ARCH;
 
@@ -843,6 +844,11 @@ mod arch {
     pub const ARCH: &'static str = "s390x";
 }
 
+#[cfg(target_arch = "sparc64")]
+mod arch {
+    pub const ARCH: &'static str = "sparc64";
+}
+
 #[cfg(target_arch = "le32")]
 mod arch {
     pub const ARCH: &'static str = "le32";
diff --git a/src/libstd/os/linux/raw.rs b/src/libstd/os/linux/raw.rs
index 7c9274d0601..bb1830a147e 100644
--- a/src/libstd/os/linux/raw.rs
+++ b/src/libstd/os/linux/raw.rs
@@ -157,12 +157,9 @@ mod arch {
     }
 }
 
-#[cfg(target_arch = "mips64")]
-mod arch {
-    pub use libc::{off_t, ino_t, nlink_t, blksize_t, blkcnt_t, stat, time_t};
-}
-
-#[cfg(target_arch = "s390x")]
+#[cfg(any(target_arch = "mips64",
+          target_arch = "s390x",
+          target_arch = "sparc64"))]
 mod arch {
     pub use libc::{off_t, ino_t, nlink_t, blksize_t, blkcnt_t, stat, time_t};
 }
diff --git a/src/libunwind/libunwind.rs b/src/libunwind/libunwind.rs
index bbac6c07c57..269c2d65b63 100644
--- a/src/libunwind/libunwind.rs
+++ b/src/libunwind/libunwind.rs
@@ -65,6 +65,9 @@ pub const unwinder_private_data_size: usize = 2;
 #[cfg(target_arch = "s390x")]
 pub const unwinder_private_data_size: usize = 2;
 
+#[cfg(target_arch = "sparc64")]
+pub const unwinder_private_data_size: usize = 2;
+
 #[cfg(target_os = "emscripten")]
 pub const unwinder_private_data_size: usize = 20;
 
diff --git a/src/rustllvm/PassWrapper.cpp b/src/rustllvm/PassWrapper.cpp
index f71dac77caf..7bc6e8b0ecb 100644
--- a/src/rustllvm/PassWrapper.cpp
+++ b/src/rustllvm/PassWrapper.cpp
@@ -141,6 +141,12 @@ extern "C" void LLVMRustAddPass(LLVMPassManagerRef PM, LLVMPassRef rust_pass) {
 #define SUBTARGET_MSP430
 #endif
 
+#ifdef LLVM_COMPONENT_SPARC
+#define SUBTARGET_SPARC SUBTARGET(Sparc)
+#else
+#define SUBTARGET_SPARC
+#endif
+
 #define GEN_SUBTARGETS                                                         \
   SUBTARGET_X86                                                                \
   SUBTARGET_ARM                                                                \
@@ -148,7 +154,8 @@ extern "C" void LLVMRustAddPass(LLVMPassManagerRef PM, LLVMPassRef rust_pass) {
   SUBTARGET_MIPS                                                               \
   SUBTARGET_PPC                                                                \
   SUBTARGET_SYSTEMZ                                                            \
-  SUBTARGET_MSP430
+  SUBTARGET_MSP430                                                             \
+  SUBTARGET_SPARC
 
 #define SUBTARGET(x)                                                           \
   namespace llvm {                                                             \