Merge pull request ziglang#21261 from alexrp/riscv32

More `riscv32-linux` port work

Author: andrewrk

lib/std/dynamic_library.zig

@@ -215,7 +215,8 @@ pub const ElfDynLib = struct {
         const fd = try resolveFromName(path);
         defer posix.close(fd);
 
-        const stat = try posix.fstat(fd);
+        const file: std.fs.File = .{ .handle = fd };
+        const stat = try file.stat();
         const size = std.math.cast(usize, stat.size) orelse return error.FileTooBig;
 
         // This one is to read the ELF info. We do more mmapping later

lib/std/os/linux.zig

@@ -1456,6 +1456,16 @@ pub fn clock_settime(clk_id: i32, tp: *const timespec) usize {
     return syscall2(.clock_settime, @as(usize, @bitCast(@as(isize, clk_id))), @intFromPtr(tp));
 }
 
+pub fn clock_nanosleep(clockid: clockid_t, flags: TIMER, request: *const timespec, remain: ?*timespec) usize {
+    return syscall4(
+        .clock_nanosleep,
+        @intFromEnum(clockid),
+        @as(u32, @bitCast(flags)),
+        @intFromPtr(request),
+        @intFromPtr(remain),
+    );
+}
+
 pub fn gettimeofday(tv: ?*timeval, tz: ?*timezone) usize {
     return syscall2(.gettimeofday, @intFromPtr(tv), @intFromPtr(tz));
 }
@@ -1465,7 +1475,9 @@ pub fn settimeofday(tv: *const timeval, tz: *const timezone) usize {
 }
 
 pub fn nanosleep(req: *const timespec, rem: ?*timespec) usize {
-    return syscall2(.nanosleep, @intFromPtr(req), @intFromPtr(rem));
+    if (native_arch == .riscv32) {
+        @compileError("No nanosleep syscall on this architecture.");
+    } else return syscall2(.nanosleep, @intFromPtr(req), @intFromPtr(rem));
 }
 
 pub fn pause() usize {
@@ -4525,6 +4537,11 @@ pub const clockid_t = enum(u32) {
     _,
 };
 
+pub const TIMER = packed struct(u32) {
+    ABSTIME: bool,
+    _: u31 = 0,
+};
+
 pub const CSIGNAL = 0x000000ff;
 
 pub const CLONE = struct {
@@ -7452,7 +7469,7 @@ pub const kernel_timespec = extern struct {
 };
 
 // https://github.com/ziglang/zig/issues/4726#issuecomment-2190337877
-pub const timespec = if (!builtin.link_libc and native_arch == .riscv32) kernel_timespec else extern struct {
+pub const timespec = if (native_arch == .riscv32) kernel_timespec else extern struct {
     sec: isize,
     nsec: isize,
 };

lib/std/os/linux/riscv32.zig

@@ -212,8 +212,37 @@ pub const msghdr_const = extern struct {
     flags: i32,
 };
 
-/// No `Stat` structure on this platform, only `Statx`.
-pub const Stat = void;
+// 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,
+    __pad: usize,
+    size: off_t,
+    blksize: blksize_t,
+    __pad2: i32,
+    blocks: blkcnt_t,
+    atim: timespec,
+    mtim: timespec,
+    ctim: timespec,
+    __unused: [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 Elf_Symndx = u32;
 

lib/std/posix/test.zig

@@ -349,6 +349,7 @@ 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()`.
     // enable when `fstat` and `fstatat` are implemented on Windows
     if (native_os == .windows) return error.SkipZigTest;
 
@@ -1264,6 +1265,9 @@ test "fchmodat smoke test" {
         0o644,
     );
     posix.close(fd);
+
+    if (builtin.cpu.arch == .riscv32 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: {
         const st = try posix.fstatat(tmp.dir.fd, "symlink", posix.AT.SYMLINK_NOFOLLOW);

lib/std/time.zig

@@ -50,6 +50,34 @@ pub fn sleep(nanoseconds: u64) void {
 
     const s = nanoseconds / ns_per_s;
     const ns = nanoseconds % ns_per_s;
+
+    // Newer kernel ports don't have old `nanosleep()` and `clock_nanosleep()` has been around
+    // since Linux 2.6 and glibc 2.1 anyway.
+    if (builtin.os.tag == .linux) {
+        const linux = std.os.linux;
+
+        var req: linux.timespec = .{
+            .sec = std.math.cast(linux.time_t, s) orelse std.math.maxInt(linux.time_t),
+            .nsec = std.math.cast(linux.time_t, ns) orelse std.math.maxInt(linux.time_t),
+        };
+        var rem: linux.timespec = undefined;
+
+        while (true) {
+            switch (linux.E.init(linux.clock_nanosleep(.MONOTONIC, .{ .ABSTIME = false }, &req, &rem))) {
+                .SUCCESS => return,
+                .INTR => {
+                    req = rem;
+                    continue;
+                },
+                .FAULT,
+                .INVAL,
+                .OPNOTSUPP,
+                => unreachable,
+                else => return,
+            }
+        }
+    }
+
     posix.nanosleep(s, ns);
 }
 

src/codegen/llvm.zig

@@ -12398,6 +12398,7 @@ fn backendSupportsF16(target: std.Target) bool {
         .mipsel,
         .mips64,
         .mips64el,
+        .riscv32,
         .s390x,
         => false,
         .aarch64,