Add support for the rumprun unikernel

For most parts, rumprun currently looks like NetBSD, as they share the same
libc and drivers. However, being a unikernel, rumprun does not support
process management, signals or virtual memory, so related functions
might fail at runtime. Stack guards are disabled exactly for this reason.

Code for rumprun is always cross-compiled, it uses always static
linking and needs a custom linker.

9 files changed, 85 insertions, 6 deletions

diff --git a/configure b/configure
index 1d95965150c..fa2117dcc1d 100755
--- a/configure
+++ b/configure
@@ -1295,6 +1295,12 @@ $ pacman -R cmake && pacman -S mingw-w64-x86_64-cmake
             putvar CFG_MSVC_LIB_PATH_${bits}
             ;;
 
+        *-rumprun-netbsd)
+            step_msg "targeting rumprun-netbsd, disabling jemalloc"
+            CFG_DISABLE_JEMALLOC=1
+            putvar CFG_DISABLE_JEMALLOC
+            ;;
+
         *)
             ;;
     esac
diff --git a/mk/cfg/x86_64-rumprun-netbsd.mk b/mk/cfg/x86_64-rumprun-netbsd.mk
new file mode 100644
index 00000000000..5894805e3e5
--- /dev/null
+++ b/mk/cfg/x86_64-rumprun-netbsd.mk
@@ -0,0 +1,24 @@
+# x86_64-rumprun-netbsd configuration
+CROSS_PREFIX_x86_64-rumprun-netbsd=x86_64-rumprun-netbsd-
+CC_x86_64-rumprun-netbsd=gcc
+CXX_x86_64-rumprun-netbsd=g++
+CPP_x86_64-rumprun-netbsd=gcc -E
+AR_x86_64-rumprun-netbsd=ar
+CFG_INSTALL_ONLY_RLIB_x86_64-rumprun-netbsd = 1
+CFG_LIB_NAME_x86_64-rumprun-netbsd=lib$(1).so
+CFG_STATIC_LIB_NAME_x86_64-rumprun-netbsd=lib$(1).a
+CFG_LIB_GLOB_x86_64-rumprun-netbsd=lib$(1)-*.so
+CFG_JEMALLOC_CFLAGS_x86_64-rumprun-netbsd := -m64
+CFG_GCCISH_CFLAGS_x86_64-rumprun-netbsd := -Wall -Werror -g -fPIC -m64
+CFG_GCCISH_CXXFLAGS_x86_64-rumprun-netbsd :=
+CFG_GCCISH_LINK_FLAGS_x86_64-rumprun-netbsd :=
+CFG_GCCISH_DEF_FLAG_x86_64-rumprun-netbsd :=
+CFG_LLC_FLAGS_x86_64-rumprun-netbsd :=
+CFG_INSTALL_NAME_x86_64-rumprun-netbsd =
+CFG_EXE_SUFFIX_x86_64-rumprun-netbsd =
+CFG_WINDOWSY_x86_64-rumprun-netbsd :=
+CFG_UNIXY_x86_64-rumprun-netbsd := 1
+CFG_LDPATH_x86_64-rumprun-netbsd :=
+CFG_RUN_x86_64-rumprun-netbsd=$(2)
+CFG_RUN_TARG_x86_64-rumprun-netbsd=$(call CFG_RUN_x86_64-rumprun-netbsd,,$(2))
+CFG_GNU_TRIPLE_x86_64-rumprun-netbsd := x86_64-rumprun-netbsd
diff --git a/src/liblibc/lib.rs b/src/liblibc/lib.rs
index 2ee69543c3c..f75851506c2 100644
--- a/src/liblibc/lib.rs
+++ b/src/liblibc/lib.rs
@@ -24,6 +24,7 @@
        html_playground_url = "https://play.rust-lang.org/",
        issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/")]
 #![cfg_attr(test, feature(test))]
+#![feature(cfg_target_vendor)]
 
 //! Bindings for the C standard library and other platform libraries
 //!
@@ -143,7 +144,10 @@ pub use funcs::bsd43::*;
 
 // On NaCl, these libraries are static. Thus it would be a Bad Idea to link them
 // in when creating a test crate.
-#[cfg(not(any(windows, target_env = "musl", all(target_os = "nacl", test))))]
+#[cfg(not(any(windows,
+              target_env = "musl",
+              all(target_os = "nacl", test),
+              all(target_os = "netbsd", target_vendor = "rumprun"))))]
 #[link(name = "c")]
 #[link(name = "m")]
 extern {}
diff --git a/src/librustc_back/target/mod.rs b/src/librustc_back/target/mod.rs
index b5847b98af1..be404fc97ce 100644
--- a/src/librustc_back/target/mod.rs
+++ b/src/librustc_back/target/mod.rs
@@ -411,6 +411,7 @@ impl Target {
             x86_64_unknown_bitrig,
             x86_64_unknown_openbsd,
             x86_64_unknown_netbsd,
+            x86_64_rumprun_netbsd,
 
             x86_64_apple_darwin,
             i686_apple_darwin,
diff --git a/src/librustc_back/target/x86_64_rumprun_netbsd.rs b/src/librustc_back/target/x86_64_rumprun_netbsd.rs
new file mode 100644
index 00000000000..d63ad53cc2b
--- /dev/null
+++ b/src/librustc_back/target/x86_64_rumprun_netbsd.rs
@@ -0,0 +1,35 @@
+// Copyright 2014-2015 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;
+
+pub fn target() -> Target {
+    let mut base = super::netbsd_base::opts();
+    base.pre_link_args.push("-m64".to_string());
+    base.linker = "x86_64-rumprun-netbsd-gcc".to_string();
+    base.ar = "x86_64-rumprun-netbsd-ar".to_string();
+
+    base.dynamic_linking = false;
+    base.has_rpath = false;
+    base.position_independent_executables = false;
+    base.disable_redzone = true;
+    base.no_default_libraries = false;
+
+    Target {
+        llvm_target: "x86_64-rumprun-netbsd".to_string(),
+        target_endian: "little".to_string(),
+        target_pointer_width: "64".to_string(),
+        arch: "x86_64".to_string(),
+        target_os: "netbsd".to_string(),
+        target_env: "".to_string(),
+        target_vendor: "rumprun".to_string(),
+        options: base,
+    }
+}
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index c67a4182f54..9129ffcc211 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -204,6 +204,7 @@
 #![feature(associated_consts)]
 #![feature(borrow_state)]
 #![feature(box_syntax)]
+#![feature(cfg_target_vendor)]
 #![feature(char_from_unchecked)]
 #![feature(char_internals)]
 #![feature(clone_from_slice)]
diff --git a/src/libstd/sys/common/libunwind.rs b/src/libstd/sys/common/libunwind.rs
index c6bffb0f733..da7ebbf4ed3 100644
--- a/src/libstd/sys/common/libunwind.rs
+++ b/src/libstd/sys/common/libunwind.rs
@@ -108,10 +108,18 @@ extern {}
 #[link(name = "unwind", kind = "static")]
 extern {}
 
-#[cfg(any(target_os = "android", target_os = "netbsd", target_os = "openbsd"))]
+#[cfg(any(target_os = "android", target_os = "openbsd"))]
 #[link(name = "gcc")]
 extern {}
 
+#[cfg(all(target_os = "netbsd", not(target_vendor = "rumprun")))]
+#[link(name = "gcc")]
+extern {}
+
+#[cfg(all(target_os = "netbsd", target_vendor = "rumprun"))]
+#[link(name = "unwind")]
+extern {}
+
 #[cfg(target_os = "dragonfly")]
 #[link(name = "gcc_pic")]
 extern {}
diff --git a/src/libstd/sys/unix/stack_overflow.rs b/src/libstd/sys/unix/stack_overflow.rs
index 441313bc639..f5fd11b61b1 100644
--- a/src/libstd/sys/unix/stack_overflow.rs
+++ b/src/libstd/sys/unix/stack_overflow.rs
@@ -34,7 +34,7 @@ impl Drop for Handler {
 #[cfg(any(target_os = "linux",
           target_os = "macos",
           target_os = "bitrig",
-          target_os = "netbsd",
+          all(target_os = "netbsd", not(target_vendor = "rumprun")),
           target_os = "openbsd"))]
 mod imp {
     use super::Handler;
@@ -143,7 +143,7 @@ mod imp {
 #[cfg(not(any(target_os = "linux",
               target_os = "macos",
               target_os = "bitrig",
-              target_os = "netbsd",
+              all(target_os = "netbsd", not(target_vendor = "rumprun")),
               target_os = "openbsd")))]
 mod imp {
     use ptr;
diff --git a/src/libstd/sys/unix/thread.rs b/src/libstd/sys/unix/thread.rs
index 83e0a03a234..50e01ecf9fa 100644
--- a/src/libstd/sys/unix/thread.rs
+++ b/src/libstd/sys/unix/thread.rs
@@ -174,7 +174,7 @@ impl Drop for Thread {
 #[cfg(all(not(target_os = "linux"),
           not(target_os = "macos"),
           not(target_os = "bitrig"),
-          not(target_os = "netbsd"),
+          not(all(target_os = "netbsd", not(target_vendor = "rumprun"))),
           not(target_os = "openbsd")))]
 pub mod guard {
     pub unsafe fn current() -> Option<usize> { None }
@@ -185,7 +185,7 @@ pub mod guard {
 #[cfg(any(target_os = "linux",
           target_os = "macos",
           target_os = "bitrig",
-          target_os = "netbsd",
+          all(target_os = "netbsd", not(target_vendor = "rumprun")),
           target_os = "openbsd"))]
 #[allow(unused_imports)]
 pub mod guard {