Merge pull request #23495 from alexrp/loongarch

Some `loongarch64-linux` porting work

Author: alexrp

lib/std/os/linux.zig

@@ -1992,8 +1992,8 @@ pub fn accept4(fd: i32, noalias addr: ?*sockaddr, noalias len: ?*socklen_t, flag
 }
 
 pub fn fstat(fd: i32, stat_buf: *Stat) usize {
-    if (native_arch == .riscv32) {
-        // riscv32 has made the interesting decision to not implement some of
+    if (native_arch == .riscv32 or native_arch.isLoongArch()) {
+        // riscv32 and loongarch have made the interesting decision to not implement some of
         // the older stat syscalls, including this one.
         @compileError("No fstat syscall on this architecture.");
     } else if (@hasField(SYS, "fstat64")) {
@@ -2004,8 +2004,8 @@ pub fn fstat(fd: i32, stat_buf: *Stat) usize {
 }
 
 pub fn stat(pathname: [*:0]const u8, statbuf: *Stat) usize {
-    if (native_arch == .riscv32) {
-        // riscv32 has made the interesting decision to not implement some of
+    if (native_arch == .riscv32 or native_arch.isLoongArch()) {
+        // riscv32 and loongarch have made the interesting decision to not implement some of
         // the older stat syscalls, including this one.
         @compileError("No stat syscall on this architecture.");
     } else if (@hasField(SYS, "stat64")) {
@@ -2016,8 +2016,8 @@ pub fn stat(pathname: [*:0]const u8, statbuf: *Stat) usize {
 }
 
 pub fn lstat(pathname: [*:0]const u8, statbuf: *Stat) usize {
-    if (native_arch == .riscv32) {
-        // riscv32 has made the interesting decision to not implement some of
+    if (native_arch == .riscv32 or native_arch.isLoongArch()) {
+        // riscv32 and loongarch have made the interesting decision to not implement some of
         // the older stat syscalls, including this one.
         @compileError("No lstat syscall on this architecture.");
     } else if (@hasField(SYS, "lstat64")) {
@@ -2028,8 +2028,8 @@ pub fn lstat(pathname: [*:0]const u8, statbuf: *Stat) usize {
 }
 
 pub fn fstatat(dirfd: i32, path: [*:0]const u8, stat_buf: *Stat, flags: u32) usize {
-    if (native_arch == .riscv32) {
-        // riscv32 has made the interesting decision to not implement some of
+    if (native_arch == .riscv32 or native_arch.isLoongArch()) {
+        // riscv32 and loongarch have made the interesting decision to not implement some of
         // the older stat syscalls, including this one.
         @compileError("No fstatat syscall on this architecture.");
     } else if (@hasField(SYS, "fstatat64")) {

lib/std/os/linux/loongarch64.zig

@@ -2,11 +2,15 @@ const builtin = @import("builtin");
 const std = @import("../../std.zig");
 const linux = std.os.linux;
 const SYS = linux.SYS;
-const iovec = std.os.iovec;
+const iovec = std.posix.iovec;
+const iovec_const = std.posix.iovec_const;
 const uid_t = linux.uid_t;
 const gid_t = linux.gid_t;
 const stack_t = linux.stack_t;
 const sigset_t = linux.sigset_t;
+const sockaddr = linux.sockaddr;
+const socklen_t = linux.socklen_t;
+const timespec = linux.timespec;
 
 pub fn syscall0(number: SYS) usize {
     return asm volatile (
@@ -150,6 +154,30 @@ pub fn restore_rt() callconv(.naked) noreturn {
     );
 }
 
+pub const msghdr = extern struct {
+    name: ?*sockaddr,
+    namelen: socklen_t,
+    iov: [*]iovec,
+    iovlen: i32,
+    __pad1: i32 = 0,
+    control: ?*anyopaque,
+    controllen: socklen_t,
+    __pad2: socklen_t = 0,
+    flags: i32,
+};
+
+pub const msghdr_const = extern struct {
+    name: ?*const sockaddr,
+    namelen: socklen_t,
+    iov: [*]const iovec_const,
+    iovlen: i32,
+    __pad1: i32 = 0,
+    control: ?*const anyopaque,
+    controllen: socklen_t,
+    __pad2: socklen_t = 0,
+    flags: i32,
+};
+
 pub const blksize_t = i32;
 pub const nlink_t = u32;
 pub const time_t = i64;
@@ -159,6 +187,38 @@ pub const ino_t = u64;
 pub const dev_t = u32;
 pub const blkcnt_t = i64;
 
+// The `stat` definition used by the Linux kernel.
+pub const Stat = extern struct {
+    dev: dev_t,
+    ino: ino_t,
+    mode: mode_t,
+    nlink: nlink_t,
+    uid: uid_t,
+    gid: gid_t,
+    rdev: dev_t,
+    _pad1: u64,
+    size: off_t,
+    blksize: blksize_t,
+    _pad2: i32,
+    blocks: blkcnt_t,
+    atim: timespec,
+    mtim: timespec,
+    ctim: timespec,
+    _pad3: [2]u32,
+
+    pub fn atime(self: @This()) timespec {
+        return self.atim;
+    }
+
+    pub fn mtime(self: @This()) timespec {
+        return self.mtim;
+    }
+
+    pub fn ctime(self: @This()) timespec {
+        return self.ctim;
+    }
+};
+
 pub const timeval = extern struct {
     tv_sec: time_t,
     tv_usec: i64,

lib/std/os/linux/test.zig

@@ -86,7 +86,7 @@ test "statx" {
         else => unreachable,
     }
 
-    if (builtin.cpu.arch == .riscv32) return error.SkipZigTest; // No fstatat, so the rest of the test is meaningless.
+    if (builtin.cpu.arch == .riscv32 or builtin.cpu.arch.isLoongArch()) return error.SkipZigTest; // No fstatat, so the rest of the test is meaningless.
 
     var stat_buf: linux.Stat = undefined;
     switch (linux.E.init(linux.fstatat(file.handle, "", &stat_buf, linux.AT.EMPTY_PATH))) {

lib/std/posix/test.zig

@@ -283,7 +283,7 @@ fn testReadlink(target_path: []const u8, symlink_path: []const u8) !void {
 
 test "link with relative paths" {
     if (native_os == .wasi) return error.SkipZigTest; // Can link, but can't change into tmpDir
-    if (builtin.cpu.arch == .riscv32 and builtin.os.tag == .linux and !builtin.link_libc) return error.SkipZigTest; // No `fstat()`.
+    if ((builtin.cpu.arch == .riscv32 or builtin.cpu.arch.isLoongArch()) and builtin.os.tag == .linux and !builtin.link_libc) return error.SkipZigTest; // No `fstat()`.
     if (builtin.cpu.arch.isMIPS64()) return error.SkipZigTest; // `nstat.nlink` assertion is failing with LLVM 20+ for unclear reasons.
 
     switch (native_os) {
@@ -331,7 +331,7 @@ test "link with relative paths" {
 }
 
 test "linkat with different directories" {
-    if (builtin.cpu.arch == .riscv32 and builtin.os.tag == .linux and !builtin.link_libc) return error.SkipZigTest; // No `fstatat()`.
+    if ((builtin.cpu.arch == .riscv32 or builtin.cpu.arch.isLoongArch()) and builtin.os.tag == .linux and !builtin.link_libc) return error.SkipZigTest; // No `fstatat()`.
     if (builtin.cpu.arch.isMIPS64()) return error.SkipZigTest; // `nstat.nlink` assertion is failing with LLVM 20+ for unclear reasons.
 
     switch (native_os) {
@@ -376,7 +376,7 @@ test "linkat with different directories" {
 }
 
 test "fstatat" {
-    if (builtin.cpu.arch == .riscv32 and builtin.os.tag == .linux and !builtin.link_libc) return error.SkipZigTest; // No `fstatat()`.
+    if ((builtin.cpu.arch == .riscv32 or builtin.cpu.arch.isLoongArch()) and builtin.os.tag == .linux and !builtin.link_libc) return error.SkipZigTest; // No `fstatat()`.
     // enable when `fstat` and `fstatat` are implemented on Windows
     if (native_os == .windows) return error.SkipZigTest;
 
@@ -1265,7 +1265,7 @@ test "fchmodat smoke test" {
     );
     posix.close(fd);
 
-    if (builtin.cpu.arch == .riscv32 and builtin.os.tag == .linux and !builtin.link_libc) return error.SkipZigTest; // No `fstatat()`.
+    if ((builtin.cpu.arch == .riscv32 or builtin.cpu.arch.isLoongArch()) and builtin.os.tag == .linux and !builtin.link_libc) return error.SkipZigTest; // No `fstatat()`.
 
     try posix.symlinkat("regfile", tmp.dir.fd, "symlink");
     const sym_mode = blk: {

test/behavior/prefetch.zig

@@ -3,6 +3,7 @@ const std = @import("std");
 
 test "@prefetch()" {
     if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
+    if (builtin.zig_backend == .stage2_llvm and builtin.cpu.arch.isLoongArch()) return error.SkipZigTest; // https://github.com/llvm/llvm-project/issues/134624
 
     var a: [2]u32 = .{ 42, 42 };
     var a_len = a.len;

test/tests.zig

@@ -497,6 +497,33 @@ const test_targets = blk: {
             .pic = false, // Long calls don't work with PIC.
         },
 
+        .{
+            .target = .{
+                .cpu_arch = .loongarch64,
+                .os_tag = .linux,
+                .abi = .none,
+            },
+            .skip_modules = &.{"std"},
+        },
+        .{
+            .target = .{
+                .cpu_arch = .loongarch64,
+                .os_tag = .linux,
+                .abi = .musl,
+            },
+            .link_libc = true,
+            .skip_modules = &.{"std"},
+        },
+        .{
+            .target = .{
+                .cpu_arch = .loongarch64,
+                .os_tag = .linux,
+                .abi = .gnu,
+            },
+            .link_libc = true,
+            .skip_modules = &.{"std"},
+        },
+
         .{
             .target = .{
                 .cpu_arch = .mips,