Auto merge of #812 - malbarbo:x32, r=alexcrichton

Initial fixes for linux x32

Tested with a local build of rustc. The main test can be compiled but fails to execute (receives SIGTRAP, which I think in this case indicates memory violation, I will open an issue in the rustc repo).

This PR is important because it fixes the definition of `c_long` and `c_ulong`. Without these fixes, rustc crash with the error:

```
Cannot emit physreg copy instruction
UNREACHABLE executed at /checkout/src/llvm/lib/Target/X86/X86InstrInfo.cpp:5778!
```

Related rust-lang/rust#37976

libc-test/build.rs

@@ -9,6 +9,7 @@ fn main() {
     let aarch64 = target.contains("aarch64");
     let i686 = target.contains("i686");
     let x86_64 = target.contains("x86_64");
+    let x32 = target.ends_with("gnux32");
     let windows = target.contains("windows");
     let mingw = target.contains("windows-gnu");
     let linux = target.contains("unknown-linux");
@@ -135,9 +136,10 @@ fn main() {
             cfg.header("sys/quota.h");
         }
 
-        if !musl {
+        if !musl && !x32 {
             cfg.header("sys/sysctl.h");
         }
+
         if !musl && !uclibc {
 
             if !netbsd && !openbsd && !uclibc {

src/unix/mod.rs

@@ -34,9 +34,14 @@ s! {
         pub tv_usec: suseconds_t,
     }
 
+    // linux x32 compatibility
+    // See https://sourceware.org/bugzilla/show_bug.cgi?id=16437
     pub struct timespec {
         pub tv_sec: time_t,
-        pub tv_nsec: c_long,
+        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
+        pub tv_nsec: i64,
+        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
+        pub tv_nsec: ::c_long,
     }
 
     pub struct rlimit {

src/unix/notbsd/linux/mod.rs

@@ -213,12 +213,30 @@ s! {
         __val: [::c_int; 2],
     }
 
+    // x32 compatibility
+    // See https://sourceware.org/bugzilla/show_bug.cgi?id=21279
     pub struct mq_attr {
+        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
+        pub mq_flags: i64,
+        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
+        pub mq_maxmsg: i64,
+        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
+        pub mq_msgsize: i64,
+        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
+        pub mq_curmsgs: i64,
+        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
+        pad: [i64; 4],
+
+        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
         pub mq_flags: ::c_long,
+        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
         pub mq_maxmsg: ::c_long,
+        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
         pub mq_msgsize: ::c_long,
+        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
         pub mq_curmsgs: ::c_long,
-        pad: [::c_long; 4]
+        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
+        pad: [::c_long; 4],
     }
 
     pub struct cpu_set_t {

src/unix/notbsd/linux/other/b32/mod.rs

@@ -281,6 +281,17 @@ pub const PTRACE_SETFPREGS: ::c_uint = 15;
 pub const PTRACE_GETREGS: ::c_uint = 12;
 pub const PTRACE_SETREGS: ::c_uint = 13;
 
+#[link(name = "util")]
+extern {
+    pub fn sysctl(name: *mut ::c_int,
+                  namelen: ::c_int,
+                  oldp: *mut ::c_void,
+                  oldlenp: *mut ::size_t,
+                  newp: *mut ::c_void,
+                  newlen: ::size_t)
+                  -> ::c_int;
+}
+
 cfg_if! {
     if #[cfg(target_arch = "x86")] {
         mod x86;

src/unix/notbsd/linux/other/b64/aarch64.rs

@@ -1,5 +1,7 @@
 //! AArch64-specific definitions for 64-bit linux-like values
 
+pub type c_long = i64;
+pub type c_ulong = u64;
 pub type c_char = u8;
 pub type wchar_t = u32;
 pub type nlink_t = u32;
@@ -763,3 +765,14 @@ pub const SYS_pkey_mprotect: ::c_ulong = 288;
 pub const SYS_pkey_alloc: ::c_ulong = 289;
 pub const SYS_pkey_free: ::c_ulong = 290;
 pub const SYS_syscalls: ::c_ulong = 291;
+
+#[link(name = "util")]
+extern {
+    pub fn sysctl(name: *mut ::c_int,
+                  namelen: ::c_int,
+                  oldp: *mut ::c_void,
+                  oldlenp: *mut ::size_t,
+                  newp: *mut ::c_void,
+                  newlen: ::size_t)
+                  -> ::c_int;
+}

src/unix/notbsd/linux/other/b64/mod.rs

@@ -1,7 +1,5 @@
 //! 64-bit specific definitions for linux-like values
 
-pub type c_long = i64;
-pub type c_ulong = u64;
 pub type clock_t = i64;
 pub type time_t = i64;
 pub type ino_t = u64;
@@ -15,18 +13,18 @@ s! {
     }
 
     pub struct sysinfo {
-        pub uptime: ::c_long,
-        pub loads: [::c_ulong; 3],
-        pub totalram: ::c_ulong,
-        pub freeram: ::c_ulong,
-        pub sharedram: ::c_ulong,
-        pub bufferram: ::c_ulong,
-        pub totalswap: ::c_ulong,
-        pub freeswap: ::c_ulong,
+        pub uptime: i64,
+        pub loads: [u64; 3],
+        pub totalram: u64,
+        pub freeram: u64,
+        pub sharedram: u64,
+        pub bufferram: u64,
+        pub totalswap: u64,
+        pub freeswap: u64,
         pub procs: ::c_ushort,
         pub pad: ::c_ushort,
-        pub totalhigh: ::c_ulong,
-        pub freehigh: ::c_ulong,
+        pub totalhigh: u64,
+        pub freehigh: u64,
         pub mem_unit: ::c_uint,
         pub _f: [::c_char; 0],
     }
@@ -64,6 +62,15 @@ cfg_if! {
     } else if #[cfg(any(target_arch = "x86_64"))] {
         mod x86_64;
         pub use self::x86_64::*;
+        cfg_if! {
+            if #[cfg(target_pointer_width = "32")] {
+                mod x32;
+                pub use self::x32::*;
+            } else {
+                mod not_x32;
+                pub use self::not_x32::*;
+            }
+        }
     } else {
         // Unknown target_arch
     }

src/unix/notbsd/linux/other/b64/not_x32.rs

@@ -0,0 +1,25 @@
+pub type c_long = i64;
+pub type c_ulong = u64;
+
+pub const SYS_uselib: ::c_long = 134;
+pub const SYS__sysctl: ::c_long = 156;
+pub const SYS_create_module: ::c_long = 174;
+pub const SYS_get_kernel_syms: ::c_long = 177;
+pub const SYS_query_module: ::c_long = 178;
+pub const SYS_nfsservctl: ::c_long = 180;
+pub const SYS_set_thread_area: ::c_long = 205;
+pub const SYS_get_thread_area: ::c_long = 211;
+pub const SYS_epoll_ctl_old: ::c_long = 214;
+pub const SYS_epoll_wait_old: ::c_long = 215;
+pub const SYS_vserver: ::c_long = 236;
+
+#[link(name = "util")]
+extern {
+    pub fn sysctl(name: *mut ::c_int,
+                  namelen: ::c_int,
+                  oldp: *mut ::c_void,
+                  oldlenp: *mut ::size_t,
+                  newp: *mut ::c_void,
+                  newlen: ::size_t)
+                  -> ::c_int;
+}

src/unix/notbsd/linux/other/b64/powerpc64.rs

@@ -1,5 +1,7 @@
 //! PowerPC64-specific definitions for 64-bit linux-like values
 
+pub type c_long = i64;
+pub type c_ulong = u64;
 pub type c_char = u8;
 pub type wchar_t = i32;
 pub type nlink_t = u64;
@@ -842,3 +844,14 @@ pub const SYS_copy_file_range: ::c_ulong = 379;
 pub const SYS_preadv2: ::c_ulong = 380;
 pub const SYS_pwritev2: ::c_ulong = 381;
 pub const SYS_kexec_file_load: ::c_ulong = 382;
+
+#[link(name = "util")]
+extern {
+    pub fn sysctl(name: *mut ::c_int,
+                  namelen: ::c_int,
+                  oldp: *mut ::c_void,
+                  oldlenp: *mut ::size_t,
+                  newp: *mut ::c_void,
+                  newlen: ::size_t)
+                  -> ::c_int;
+}

src/unix/notbsd/linux/other/b64/sparc64.rs

@@ -1,5 +1,7 @@
 //! SPARC64-specific definitions for 64-bit linux-like values
 
+pub type c_long = i64;
+pub type c_ulong = u64;
 pub type c_char = i8;
 pub type wchar_t = i32;
 pub type nlink_t = u32;
@@ -430,3 +432,14 @@ pub const TIOCOUTQ: ::c_ulong = 0x40047473;
 pub const TIOCGWINSZ: ::c_ulong = 0x40087468;
 pub const TIOCSWINSZ: ::c_ulong = 0x80087467;
 pub const FIONREAD: ::c_ulong = 0x4004667f;
+
+#[link(name = "util")]
+extern {
+    pub fn sysctl(name: *mut ::c_int,
+                  namelen: ::c_int,
+                  oldp: *mut ::c_void,
+                  oldlenp: *mut ::size_t,
+                  newp: *mut ::c_void,
+                  newlen: ::size_t)
+                  -> ::c_int;
+}

src/unix/notbsd/linux/other/b64/x32.rs

@@ -0,0 +1,2 @@
+pub type c_long = i32;
+pub type c_ulong = u32;

src/unix/notbsd/linux/other/b64/x86_64.rs

@@ -22,11 +22,11 @@ s! {
         pub st_blksize: ::blksize_t,
         pub st_blocks: ::blkcnt_t,
         pub st_atime: ::time_t,
-        pub st_atime_nsec: ::c_long,
+        pub st_atime_nsec: i64,
         pub st_mtime: ::time_t,
-        pub st_mtime_nsec: ::c_long,
+        pub st_mtime_nsec: i64,
         pub st_ctime: ::time_t,
-        pub st_ctime_nsec: ::c_long,
+        pub st_ctime_nsec: i64,
         __unused: [::c_long; 3],
     }
 
@@ -43,11 +43,11 @@ s! {
         pub st_blksize: ::blksize_t,
         pub st_blocks: ::blkcnt64_t,
         pub st_atime: ::time_t,
-        pub st_atime_nsec: ::c_long,
+        pub st_atime_nsec: i64,
         pub st_mtime: ::time_t,
-        pub st_mtime_nsec: ::c_long,
+        pub st_mtime_nsec: i64,
         pub st_ctime: ::time_t,
-        pub st_ctime_nsec: ::c_long,
+        pub st_ctime_nsec: i64,
         __reserved: [::c_long; 3],
     }
 
@@ -742,7 +742,6 @@ pub const SYS_rt_sigsuspend: ::c_long = 130;
 pub const SYS_sigaltstack: ::c_long = 131;
 pub const SYS_utime: ::c_long = 132;
 pub const SYS_mknod: ::c_long = 133;
-pub const SYS_uselib: ::c_long = 134;
 pub const SYS_personality: ::c_long = 135;
 pub const SYS_ustat: ::c_long = 136;
 pub const SYS_statfs: ::c_long = 137;
@@ -764,7 +763,6 @@ pub const SYS_munlockall: ::c_long = 152;
 pub const SYS_vhangup: ::c_long = 153;
 pub const SYS_modify_ldt: ::c_long = 154;
 pub const SYS_pivot_root: ::c_long = 155;
-pub const SYS__sysctl: ::c_long = 156;
 pub const SYS_prctl: ::c_long = 157;
 pub const SYS_arch_prctl: ::c_long = 158;
 pub const SYS_adjtimex: ::c_long = 159;
@@ -782,13 +780,9 @@ pub const SYS_sethostname: ::c_long = 170;
 pub const SYS_setdomainname: ::c_long = 171;
 pub const SYS_iopl: ::c_long = 172;
 pub const SYS_ioperm: ::c_long = 173;
-pub const SYS_create_module: ::c_long = 174;
 pub const SYS_init_module: ::c_long = 175;
 pub const SYS_delete_module: ::c_long = 176;
-pub const SYS_get_kernel_syms: ::c_long = 177;
-pub const SYS_query_module: ::c_long = 178;
 pub const SYS_quotactl: ::c_long = 179;
-pub const SYS_nfsservctl: ::c_long = 180;
 pub const SYS_getpmsg: ::c_long = 181;
 pub const SYS_putpmsg: ::c_long = 182;
 pub const SYS_afs_syscall: ::c_long = 183;
@@ -813,17 +807,13 @@ pub const SYS_time: ::c_long = 201;
 pub const SYS_futex: ::c_long = 202;
 pub const SYS_sched_setaffinity: ::c_long = 203;
 pub const SYS_sched_getaffinity: ::c_long = 204;
-pub const SYS_set_thread_area: ::c_long = 205;
 pub const SYS_io_setup: ::c_long = 206;
 pub const SYS_io_destroy: ::c_long = 207;
 pub const SYS_io_getevents: ::c_long = 208;
 pub const SYS_io_submit: ::c_long = 209;
 pub const SYS_io_cancel: ::c_long = 210;
-pub const SYS_get_thread_area: ::c_long = 211;
 pub const SYS_lookup_dcookie: ::c_long = 212;
 pub const SYS_epoll_create: ::c_long = 213;
-pub const SYS_epoll_ctl_old: ::c_long = 214;
-pub const SYS_epoll_wait_old: ::c_long = 215;
 pub const SYS_remap_file_pages: ::c_long = 216;
 pub const SYS_getdents64: ::c_long = 217;
 pub const SYS_set_tid_address: ::c_long = 218;
@@ -844,7 +834,6 @@ pub const SYS_epoll_wait: ::c_long = 232;
 pub const SYS_epoll_ctl: ::c_long = 233;
 pub const SYS_tgkill: ::c_long = 234;
 pub const SYS_utimes: ::c_long = 235;
-pub const SYS_vserver: ::c_long = 236;
 pub const SYS_mbind: ::c_long = 237;
 pub const SYS_set_mempolicy: ::c_long = 238;
 pub const SYS_get_mempolicy: ::c_long = 239;

src/unix/notbsd/linux/other/mod.rs

@@ -44,7 +44,8 @@ s! {
 
         #[cfg(any(target_arch = "aarch64",
                   target_arch = "sparc64",
-                  target_pointer_width = "32"))]
+                  all(target_pointer_width = "32",
+                      not(target_arch = "x86_64"))))]
         pub ut_session: ::c_long,
         #[cfg(any(target_arch = "aarch64",
                   target_arch = "sparc64",
@@ -53,7 +54,8 @@ s! {
 
         #[cfg(not(any(target_arch = "aarch64",
                       target_arch = "sparc64",
-                      target_pointer_width = "32")))]
+                      all(target_pointer_width = "32",
+                          not(target_arch = "x86_64")))))]
         pub ut_session: ::int32_t,
         #[cfg(not(any(target_arch = "aarch64",
                       target_arch = "sparc64",
@@ -568,13 +570,6 @@ extern {
 
 #[link(name = "util")]
 extern {
-    pub fn sysctl(name: *mut ::c_int,
-                  namelen: ::c_int,
-                  oldp: *mut ::c_void,
-                  oldlenp: *mut ::size_t,
-                  newp: *mut ::c_void,
-                  newlen: ::size_t)
-                  -> ::c_int;
     pub fn ioctl(fd: ::c_int, request: ::c_ulong, ...) -> ::c_int;
     pub fn backtrace(buf: *mut *mut ::c_void,
                      sz: ::c_int) -> ::c_int;