Merge pull request #3808 from LemonBoy/i386-for-ya

linux-i386 support

lib/std/debug.zig

@@ -2417,6 +2417,12 @@ extern fn handleSegfaultLinux(sig: i32, info: *const os.siginfo_t, ctx_ptr: *con
     std.debug.warn("Segmentation fault at address 0x{x}\n", addr);
 
     switch (builtin.arch) {
+        .i386 => {
+            const ctx = @ptrCast(*const os.ucontext_t, @alignCast(@alignOf(os.ucontext_t), ctx_ptr));
+            const ip = @intCast(usize, ctx.mcontext.gregs[os.REG_EIP]);
+            const bp = @intCast(usize, ctx.mcontext.gregs[os.REG_EBP]);
+            dumpStackTraceFromBase(bp, ip);
+        },
         .x86_64 => {
             const ctx = @ptrCast(*const os.ucontext_t, @alignCast(@alignOf(os.ucontext_t), ctx_ptr));
             const ip = @intCast(usize, ctx.mcontext.gregs[os.REG_RIP]);

lib/std/os/bits/linux.zig

@@ -9,6 +9,7 @@ pub usingnamespace switch (builtin.arch) {
 };
 
 pub usingnamespace switch (builtin.arch) {
+    .i386 => @import("linux/i386.zig"),
     .x86_64 => @import("linux/x86_64.zig"),
     .aarch64 => @import("linux/arm64.zig"),
     .arm => @import("linux/arm-eabi.zig"),

lib/std/os/bits/linux/arm-eabi.zig

@@ -466,7 +466,6 @@ pub const MAP_LOCKED = 0x2000;
 /// don't check for reservations
 pub const MAP_NORESERVE = 0x4000;
 
-pub const VDSO_USEFUL = true;
 pub const VDSO_CGT_SYM = "__vdso_clock_gettime";
 pub const VDSO_CGT_VER = "LINUX_2.6";
 

lib/std/os/bits/linux/arm64.zig

@@ -358,7 +358,6 @@ pub const MAP_LOCKED = 0x2000;
 /// don't check for reservations
 pub const MAP_NORESERVE = 0x4000;
 
-pub const VDSO_USEFUL = true;
 pub const VDSO_CGT_SYM = "__kernel_clock_gettime";
 pub const VDSO_CGT_VER = "LINUX_2.6.39";
 

lib/std/os/bits/linux/i386.zig

@@ -0,0 +1,642 @@
+// i386-specific declarations that are intended to be imported into the POSIX namespace.
+// This does include Linux-only APIs.
+
+const std = @import("../../../std.zig");
+const linux = std.os.linux;
+const socklen_t = linux.socklen_t;
+const iovec = linux.iovec;
+const iovec_const = linux.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;
+
+pub const SYS_restart_syscall = 0;
+pub const SYS_exit = 1;
+pub const SYS_fork = 2;
+pub const SYS_read = 3;
+pub const SYS_write = 4;
+pub const SYS_open = 5;
+pub const SYS_close = 6;
+pub const SYS_waitpid = 7;
+pub const SYS_creat = 8;
+pub const SYS_link = 9;
+pub const SYS_unlink = 10;
+pub const SYS_execve = 11;
+pub const SYS_chdir = 12;
+pub const SYS_time = 13;
+pub const SYS_mknod = 14;
+pub const SYS_chmod = 15;
+pub const SYS_lchown = 16;
+pub const SYS_break = 17;
+pub const SYS_oldstat = 18;
+pub const SYS_lseek = 19;
+pub const SYS_getpid = 20;
+pub const SYS_mount = 21;
+pub const SYS_umount = 22;
+pub const SYS_setuid = 23;
+pub const SYS_getuid = 24;
+pub const SYS_stime = 25;
+pub const SYS_ptrace = 26;
+pub const SYS_alarm = 27;
+pub const SYS_oldfstat = 28;
+pub const SYS_pause = 29;
+pub const SYS_utime = 30;
+pub const SYS_stty = 31;
+pub const SYS_gtty = 32;
+pub const SYS_access = 33;
+pub const SYS_nice = 34;
+pub const SYS_ftime = 35;
+pub const SYS_sync = 36;
+pub const SYS_kill = 37;
+pub const SYS_rename = 38;
+pub const SYS_mkdir = 39;
+pub const SYS_rmdir = 40;
+pub const SYS_dup = 41;
+pub const SYS_pipe = 42;
+pub const SYS_times = 43;
+pub const SYS_prof = 44;
+pub const SYS_brk = 45;
+pub const SYS_setgid = 46;
+pub const SYS_getgid = 47;
+pub const SYS_signal = 48;
+pub const SYS_geteuid = 49;
+pub const SYS_getegid = 50;
+pub const SYS_acct = 51;
+pub const SYS_umount2 = 52;
+pub const SYS_lock = 53;
+pub const SYS_ioctl = 54;
+pub const SYS_fcntl = 55;
+pub const SYS_mpx = 56;
+pub const SYS_setpgid = 57;
+pub const SYS_ulimit = 58;
+pub const SYS_oldolduname = 59;
+pub const SYS_umask = 60;
+pub const SYS_chroot = 61;
+pub const SYS_ustat = 62;
+pub const SYS_dup2 = 63;
+pub const SYS_getppid = 64;
+pub const SYS_getpgrp = 65;
+pub const SYS_setsid = 66;
+pub const SYS_sigaction = 67;
+pub const SYS_sgetmask = 68;
+pub const SYS_ssetmask = 69;
+pub const SYS_setreuid = 70;
+pub const SYS_setregid = 71;
+pub const SYS_sigsuspend = 72;
+pub const SYS_sigpending = 73;
+pub const SYS_sethostname = 74;
+pub const SYS_setrlimit = 75;
+pub const SYS_getrlimit = 76;
+pub const SYS_getrusage = 77;
+pub const SYS_gettimeofday = 78;
+pub const SYS_settimeofday = 79;
+pub const SYS_getgroups = 80;
+pub const SYS_setgroups = 81;
+pub const SYS_select = 82;
+pub const SYS_symlink = 83;
+pub const SYS_oldlstat = 84;
+pub const SYS_readlink = 85;
+pub const SYS_uselib = 86;
+pub const SYS_swapon = 87;
+pub const SYS_reboot = 88;
+pub const SYS_readdir = 89;
+pub const SYS_mmap = 90;
+pub const SYS_munmap = 91;
+pub const SYS_truncate = 92;
+pub const SYS_ftruncate = 93;
+pub const SYS_fchmod = 94;
+pub const SYS_fchown = 95;
+pub const SYS_getpriority = 96;
+pub const SYS_setpriority = 97;
+pub const SYS_profil = 98;
+pub const SYS_statfs = 99;
+pub const SYS_fstatfs = 100;
+pub const SYS_ioperm = 101;
+pub const SYS_socketcall = 102;
+pub const SYS_syslog = 103;
+pub const SYS_setitimer = 104;
+pub const SYS_getitimer = 105;
+pub const SYS_stat = 106;
+pub const SYS_lstat = 107;
+pub const SYS_fstat = 108;
+pub const SYS_olduname = 109;
+pub const SYS_iopl = 110;
+pub const SYS_vhangup = 111;
+pub const SYS_idle = 112;
+pub const SYS_vm86old = 113;
+pub const SYS_wait4 = 114;
+pub const SYS_swapoff = 115;
+pub const SYS_sysinfo = 116;
+pub const SYS_ipc = 117;
+pub const SYS_fsync = 118;
+pub const SYS_sigreturn = 119;
+pub const SYS_clone = 120;
+pub const SYS_setdomainname = 121;
+pub const SYS_uname = 122;
+pub const SYS_modify_ldt = 123;
+pub const SYS_adjtimex = 124;
+pub const SYS_mprotect = 125;
+pub const SYS_sigprocmask = 126;
+pub const SYS_create_module = 127;
+pub const SYS_init_module = 128;
+pub const SYS_delete_module = 129;
+pub const SYS_get_kernel_syms = 130;
+pub const SYS_quotactl = 131;
+pub const SYS_getpgid = 132;
+pub const SYS_fchdir = 133;
+pub const SYS_bdflush = 134;
+pub const SYS_sysfs = 135;
+pub const SYS_personality = 136;
+pub const SYS_afs_syscall = 137;
+pub const SYS_setfsuid = 138;
+pub const SYS_setfsgid = 139;
+pub const SYS__llseek = 140;
+pub const SYS_getdents = 141;
+pub const SYS__newselect = 142;
+pub const SYS_flock = 143;
+pub const SYS_msync = 144;
+pub const SYS_readv = 145;
+pub const SYS_writev = 146;
+pub const SYS_getsid = 147;
+pub const SYS_fdatasync = 148;
+pub const SYS__sysctl = 149;
+pub const SYS_mlock = 150;
+pub const SYS_munlock = 151;
+pub const SYS_mlockall = 152;
+pub const SYS_munlockall = 153;
+pub const SYS_sched_setparam = 154;
+pub const SYS_sched_getparam = 155;
+pub const SYS_sched_setscheduler = 156;
+pub const SYS_sched_getscheduler = 157;
+pub const SYS_sched_yield = 158;
+pub const SYS_sched_get_priority_max = 159;
+pub const SYS_sched_get_priority_min = 160;
+pub const SYS_sched_rr_get_interval = 161;
+pub const SYS_nanosleep = 162;
+pub const SYS_mremap = 163;
+pub const SYS_setresuid = 164;
+pub const SYS_getresuid = 165;
+pub const SYS_vm86 = 166;
+pub const SYS_query_module = 167;
+pub const SYS_poll = 168;
+pub const SYS_nfsservctl = 169;
+pub const SYS_setresgid = 170;
+pub const SYS_getresgid = 171;
+pub const SYS_prctl = 172;
+pub const SYS_rt_sigreturn = 173;
+pub const SYS_rt_sigaction = 174;
+pub const SYS_rt_sigprocmask = 175;
+pub const SYS_rt_sigpending = 176;
+pub const SYS_rt_sigtimedwait = 177;
+pub const SYS_rt_sigqueueinfo = 178;
+pub const SYS_rt_sigsuspend = 179;
+pub const SYS_pread64 = 180;
+pub const SYS_pwrite64 = 181;
+pub const SYS_chown = 182;
+pub const SYS_getcwd = 183;
+pub const SYS_capget = 184;
+pub const SYS_capset = 185;
+pub const SYS_sigaltstack = 186;
+pub const SYS_sendfile = 187;
+pub const SYS_getpmsg = 188;
+pub const SYS_putpmsg = 189;
+pub const SYS_vfork = 190;
+pub const SYS_ugetrlimit = 191;
+pub const SYS_mmap2 = 192;
+pub const SYS_truncate64 = 193;
+pub const SYS_ftruncate64 = 194;
+pub const SYS_stat64 = 195;
+pub const SYS_lstat64 = 196;
+pub const SYS_fstat64 = 197;
+pub const SYS_lchown32 = 198;
+pub const SYS_getuid32 = 199;
+pub const SYS_getgid32 = 200;
+pub const SYS_geteuid32 = 201;
+pub const SYS_getegid32 = 202;
+pub const SYS_setreuid32 = 203;
+pub const SYS_setregid32 = 204;
+pub const SYS_getgroups32 = 205;
+pub const SYS_setgroups32 = 206;
+pub const SYS_fchown32 = 207;
+pub const SYS_setresuid32 = 208;
+pub const SYS_getresuid32 = 209;
+pub const SYS_setresgid32 = 210;
+pub const SYS_getresgid32 = 211;
+pub const SYS_chown32 = 212;
+pub const SYS_setuid32 = 213;
+pub const SYS_setgid32 = 214;
+pub const SYS_setfsuid32 = 215;
+pub const SYS_setfsgid32 = 216;
+pub const SYS_pivot_root = 217;
+pub const SYS_mincore = 218;
+pub const SYS_madvise = 219;
+pub const SYS_getdents64 = 220;
+pub const SYS_fcntl64 = 221;
+pub const SYS_gettid = 224;
+pub const SYS_readahead = 225;
+pub const SYS_setxattr = 226;
+pub const SYS_lsetxattr = 227;
+pub const SYS_fsetxattr = 228;
+pub const SYS_getxattr = 229;
+pub const SYS_lgetxattr = 230;
+pub const SYS_fgetxattr = 231;
+pub const SYS_listxattr = 232;
+pub const SYS_llistxattr = 233;
+pub const SYS_flistxattr = 234;
+pub const SYS_removexattr = 235;
+pub const SYS_lremovexattr = 236;
+pub const SYS_fremovexattr = 237;
+pub const SYS_tkill = 238;
+pub const SYS_sendfile64 = 239;
+pub const SYS_futex = 240;
+pub const SYS_sched_setaffinity = 241;
+pub const SYS_sched_getaffinity = 242;
+pub const SYS_set_thread_area = 243;
+pub const SYS_get_thread_area = 244;
+pub const SYS_io_setup = 245;
+pub const SYS_io_destroy = 246;
+pub const SYS_io_getevents = 247;
+pub const SYS_io_submit = 248;
+pub const SYS_io_cancel = 249;
+pub const SYS_fadvise64 = 250;
+pub const SYS_exit_group = 252;
+pub const SYS_lookup_dcookie = 253;
+pub const SYS_epoll_create = 254;
+pub const SYS_epoll_ctl = 255;
+pub const SYS_epoll_wait = 256;
+pub const SYS_remap_file_pages = 257;
+pub const SYS_set_tid_address = 258;
+pub const SYS_timer_create = 259;
+pub const SYS_timer_settime = SYS_timer_create + 1;
+pub const SYS_timer_gettime = SYS_timer_create + 2;
+pub const SYS_timer_getoverrun = SYS_timer_create + 3;
+pub const SYS_timer_delete = SYS_timer_create + 4;
+pub const SYS_clock_settime = SYS_timer_create + 5;
+pub const SYS_clock_gettime = SYS_timer_create + 6;
+pub const SYS_clock_getres = SYS_timer_create + 7;
+pub const SYS_clock_nanosleep = SYS_timer_create + 8;
+pub const SYS_statfs64 = 268;
+pub const SYS_fstatfs64 = 269;
+pub const SYS_tgkill = 270;
+pub const SYS_utimes = 271;
+pub const SYS_fadvise64_64 = 272;
+pub const SYS_vserver = 273;
+pub const SYS_mbind = 274;
+pub const SYS_get_mempolicy = 275;
+pub const SYS_set_mempolicy = 276;
+pub const SYS_mq_open = 277;
+pub const SYS_mq_unlink = SYS_mq_open + 1;
+pub const SYS_mq_timedsend = SYS_mq_open + 2;
+pub const SYS_mq_timedreceive = SYS_mq_open + 3;
+pub const SYS_mq_notify = SYS_mq_open + 4;
+pub const SYS_mq_getsetattr = SYS_mq_open + 5;
+pub const SYS_kexec_load = 283;
+pub const SYS_waitid = 284;
+pub const SYS_add_key = 286;
+pub const SYS_request_key = 287;
+pub const SYS_keyctl = 288;
+pub const SYS_ioprio_set = 289;
+pub const SYS_ioprio_get = 290;
+pub const SYS_inotify_init = 291;
+pub const SYS_inotify_add_watch = 292;
+pub const SYS_inotify_rm_watch = 293;
+pub const SYS_migrate_pages = 294;
+pub const SYS_openat = 295;
+pub const SYS_mkdirat = 296;
+pub const SYS_mknodat = 297;
+pub const SYS_fchownat = 298;
+pub const SYS_futimesat = 299;
+pub const SYS_fstatat64 = 300;
+pub const SYS_unlinkat = 301;
+pub const SYS_renameat = 302;
+pub const SYS_linkat = 303;
+pub const SYS_symlinkat = 304;
+pub const SYS_readlinkat = 305;
+pub const SYS_fchmodat = 306;
+pub const SYS_faccessat = 307;
+pub const SYS_pselect6 = 308;
+pub const SYS_ppoll = 309;
+pub const SYS_unshare = 310;
+pub const SYS_set_robust_list = 311;
+pub const SYS_get_robust_list = 312;
+pub const SYS_splice = 313;
+pub const SYS_sync_file_range = 314;
+pub const SYS_tee = 315;
+pub const SYS_vmsplice = 316;
+pub const SYS_move_pages = 317;
+pub const SYS_getcpu = 318;
+pub const SYS_epoll_pwait = 319;
+pub const SYS_utimensat = 320;
+pub const SYS_signalfd = 321;
+pub const SYS_timerfd_create = 322;
+pub const SYS_eventfd = 323;
+pub const SYS_fallocate = 324;
+pub const SYS_timerfd_settime = 325;
+pub const SYS_timerfd_gettime = 326;
+pub const SYS_signalfd4 = 327;
+pub const SYS_eventfd2 = 328;
+pub const SYS_epoll_create1 = 329;
+pub const SYS_dup3 = 330;
+pub const SYS_pipe2 = 331;
+pub const SYS_inotify_init1 = 332;
+pub const SYS_preadv = 333;
+pub const SYS_pwritev = 334;
+pub const SYS_rt_tgsigqueueinfo = 335;
+pub const SYS_perf_event_open = 336;
+pub const SYS_recvmmsg = 337;
+pub const SYS_fanotify_init = 338;
+pub const SYS_fanotify_mark = 339;
+pub const SYS_prlimit64 = 340;
+pub const SYS_name_to_handle_at = 341;
+pub const SYS_open_by_handle_at = 342;
+pub const SYS_clock_adjtime = 343;
+pub const SYS_syncfs = 344;
+pub const SYS_sendmmsg = 345;
+pub const SYS_setns = 346;
+pub const SYS_process_vm_readv = 347;
+pub const SYS_process_vm_writev = 348;
+pub const SYS_kcmp = 349;
+pub const SYS_finit_module = 350;
+pub const SYS_sched_setattr = 351;
+pub const SYS_sched_getattr = 352;
+pub const SYS_renameat2 = 353;
+pub const SYS_seccomp = 354;
+pub const SYS_getrandom = 355;
+pub const SYS_memfd_create = 356;
+pub const SYS_bpf = 357;
+pub const SYS_execveat = 358;
+pub const SYS_socket = 359;
+pub const SYS_socketpair = 360;
+pub const SYS_bind = 361;
+pub const SYS_connect = 362;
+pub const SYS_listen = 363;
+pub const SYS_accept4 = 364;
+pub const SYS_getsockopt = 365;
+pub const SYS_setsockopt = 366;
+pub const SYS_getsockname = 367;
+pub const SYS_getpeername = 368;
+pub const SYS_sendto = 369;
+pub const SYS_sendmsg = 370;
+pub const SYS_recvfrom = 371;
+pub const SYS_recvmsg = 372;
+pub const SYS_shutdown = 373;
+pub const SYS_userfaultfd = 374;
+pub const SYS_membarrier = 375;
+pub const SYS_mlock2 = 376;
+pub const SYS_copy_file_range = 377;
+pub const SYS_preadv2 = 378;
+pub const SYS_pwritev2 = 379;
+pub const SYS_pkey_mprotect = 380;
+pub const SYS_pkey_alloc = 381;
+pub const SYS_pkey_free = 382;
+pub const SYS_statx = 383;
+pub const SYS_arch_prctl = 384;
+pub const SYS_io_pgetevents = 385;
+pub const SYS_rseq = 386;
+pub const SYS_semget = 393;
+pub const SYS_semctl = 394;
+pub const SYS_shmget = 395;
+pub const SYS_shmctl = 396;
+pub const SYS_shmat = 397;
+pub const SYS_shmdt = 398;
+pub const SYS_msgget = 399;
+pub const SYS_msgsnd = 400;
+pub const SYS_msgrcv = 401;
+pub const SYS_msgctl = 402;
+pub const SYS_clock_gettime64 = 403;
+pub const SYS_clock_settime64 = 404;
+pub const SYS_clock_adjtime64 = 405;
+pub const SYS_clock_getres_time64 = 406;
+pub const SYS_clock_nanosleep_time64 = 407;
+pub const SYS_timer_gettime64 = 408;
+pub const SYS_timer_settime64 = 409;
+pub const SYS_timerfd_gettime64 = 410;
+pub const SYS_timerfd_settime64 = 411;
+pub const SYS_utimensat_time64 = 412;
+pub const SYS_pselect6_time64 = 413;
+pub const SYS_ppoll_time64 = 414;
+pub const SYS_io_pgetevents_time64 = 416;
+pub const SYS_recvmmsg_time64 = 417;
+pub const SYS_mq_timedsend_time64 = 418;
+pub const SYS_mq_timedreceive_time64 = 419;
+pub const SYS_semtimedop_time64 = 420;
+pub const SYS_rt_sigtimedwait_time64 = 421;
+pub const SYS_futex_time64 = 422;
+pub const SYS_sched_rr_get_interval_time64 = 423;
+pub const SYS_pidfd_send_signal = 424;
+pub const SYS_io_uring_setup = 425;
+pub const SYS_io_uring_enter = 426;
+pub const SYS_io_uring_register = 427;
+pub const SYS_open_tree = 428;
+pub const SYS_move_mount = 429;
+pub const SYS_fsopen = 430;
+pub const SYS_fsconfig = 431;
+pub const SYS_fsmount = 432;
+pub const SYS_fspick = 433;
+
+pub const O_CREAT = 0o100;
+pub const O_EXCL = 0o200;
+pub const O_NOCTTY = 0o400;
+pub const O_TRUNC = 0o1000;
+pub const O_APPEND = 0o2000;
+pub const O_NONBLOCK = 0o4000;
+pub const O_DSYNC = 0o10000;
+pub const O_SYNC = 0o4010000;
+pub const O_RSYNC = 0o4010000;
+pub const O_DIRECTORY = 0o200000;
+pub const O_NOFOLLOW = 0o400000;
+pub const O_CLOEXEC = 0o2000000;
+
+pub const O_ASYNC = 0o20000;
+pub const O_DIRECT = 0o40000;
+pub const O_LARGEFILE = 0o100000;
+pub const O_NOATIME = 0o1000000;
+pub const O_PATH = 0o10000000;
+pub const O_TMPFILE = 0o20200000;
+pub const O_NDELAY = O_NONBLOCK;
+
+pub const F_DUPFD = 0;
+pub const F_GETFD = 1;
+pub const F_SETFD = 2;
+pub const F_GETFL = 3;
+pub const F_SETFL = 4;
+
+pub const F_SETOWN = 8;
+pub const F_GETOWN = 9;
+pub const F_SETSIG = 10;
+pub const F_GETSIG = 11;
+
+pub const F_GETLK = 12;
+pub const F_SETLK = 13;
+pub const F_SETLKW = 14;
+
+pub const F_SETOWN_EX = 15;
+pub const F_GETOWN_EX = 16;
+
+pub const F_GETOWNER_UIDS = 17;
+
+pub const MAP_NORESERVE = 0x4000;
+pub const MAP_GROWSDOWN = 0x0100;
+pub const MAP_DENYWRITE = 0x0800;
+pub const MAP_EXECUTABLE = 0x1000;
+pub const MAP_LOCKED = 0x2000;
+pub const MAP_32BIT = 0x40;
+
+pub const MMAP2_UNIT = 4096;
+
+pub const VDSO_CGT_SYM = "__vdso_clock_gettime";
+pub const VDSO_CGT_VER = "LINUX_2.6";
+
+pub const msghdr = extern struct {
+    msg_name: ?*sockaddr,
+    msg_namelen: socklen_t,
+    msg_iov: [*]iovec,
+    msg_iovlen: i32,
+    msg_control: ?*c_void,
+    msg_controllen: socklen_t,
+    msg_flags: i32,
+};
+
+pub const msghdr_const = extern struct {
+    msg_name: ?*const sockaddr,
+    msg_namelen: socklen_t,
+    msg_iov: [*]iovec_const,
+    msg_iovlen: i32,
+    msg_control: ?*c_void,
+    msg_controllen: socklen_t,
+    msg_flags: i32,
+};
+
+pub const blksize_t = i32;
+pub const nlink_t = u32;
+pub const time_t = isize;
+pub const mode_t = u32;
+pub const off_t = i64;
+pub const ino_t = u64;
+pub const dev_t = u64;
+pub const blkcnt_t = i64;
+
+/// Renamed to Stat to not conflict with the stat function.
+/// atime, mtime, and ctime have functions to return `timespec`,
+/// because although this is a POSIX API, the layout and names of
+/// the structs are inconsistent across operating systems, and
+/// in C, macros are used to hide the differences. Here we use
+/// methods to accomplish this.
+pub const Stat = extern struct {
+    dev: dev_t,
+    __dev_padding: u32,
+    __ino_truncated: u32,
+    mode: mode_t,
+    nlink: nlink_t,
+    uid: uid_t,
+    gid: gid_t,
+    rdev: dev_t,
+    __rdev_padding: u32,
+    size: off_t,
+    blksize: blksize_t,
+    blocks: blkcnt_t,
+    atim: timespec,
+    mtim: timespec,
+    ctim: timespec,
+    ino: ino_t,
+
+    pub fn atime(self: Stat) timespec {
+        return self.atim;
+    }
+
+    pub fn mtime(self: Stat) timespec {
+        return self.mtim;
+    }
+
+    pub fn ctime(self: Stat) timespec {
+        return self.ctim;
+    }
+};
+
+pub const timespec = extern struct {
+    tv_sec: i32,
+    tv_nsec: i32,
+};
+
+pub const timeval = extern struct {
+    tv_sec: i32,
+    tv_usec: i32,
+};
+
+pub const timezone = extern struct {
+    tz_minuteswest: i32,
+    tz_dsttime: i32,
+};
+
+pub const mcontext_t = extern struct {
+    gregs: [19]usize,
+    fpregs: [*]u8,
+    oldmask: usize,
+    cr2: usize,
+};
+
+pub const REG_GS = 0;
+pub const REG_FS = 1;
+pub const REG_ES = 2;
+pub const REG_DS = 3;
+pub const REG_EDI = 4;
+pub const REG_ESI = 5;
+pub const REG_EBP = 6;
+pub const REG_ESP = 7;
+pub const REG_EBX = 8;
+pub const REG_EDX = 9;
+pub const REG_ECX = 10;
+pub const REG_EAX = 11;
+pub const REG_TRAPNO = 12;
+pub const REG_ERR = 13;
+pub const REG_EIP = 14;
+pub const REG_CS = 15;
+pub const REG_EFL = 16;
+pub const REG_UESP = 17;
+pub const REG_SS = 18;
+
+pub const ucontext_t = extern struct {
+    flags: usize,
+    link: *ucontext_t,
+    stack: stack_t,
+    mcontext: mcontext_t,
+    sigmask: sigset_t,
+    regspace: [64]u64,
+};
+
+pub const Elf_Symndx = u32;
+
+pub const user_desc = packed struct {
+    entry_number: u32,
+    base_addr: u32,
+    limit: u32,
+    seg_32bit: u1,
+    contents: u2,
+    read_exec_only: u1,
+    limit_in_pages: u1,
+    seg_not_present: u1,
+    useable: u1,
+};
+
+// socketcall() call numbers
+pub const SC_socket = 1;
+pub const SC_bind = 2;
+pub const SC_connect = 3;
+pub const SC_listen = 4;
+pub const SC_accept = 5;
+pub const SC_getsockname = 6;
+pub const SC_getpeername = 7;
+pub const SC_socketpair = 8;
+pub const SC_send = 9;
+pub const SC_recv = 10;
+pub const SC_sendto = 11;
+pub const SC_recvfrom = 12;
+pub const SC_shutdown = 13;
+pub const SC_setsockopt = 14;
+pub const SC_getsockopt = 15;
+pub const SC_sendmsg = 16;
+pub const SC_recvmsg = 17;
+pub const SC_accept4 = 18;
+pub const SC_recvmmsg = 19;
+pub const SC_sendmmsg = 20;

lib/std/os/bits/linux/mipsel.zig

@@ -454,7 +454,6 @@ pub const SO_PEERSEC = 30;
 pub const SO_SNDBUFFORCE = 31;
 pub const SO_RCVBUFFORCE = 33;
 
-pub const VDSO_USEFUL = true;
 pub const VDSO_CGT_SYM = "__kernel_clock_gettime";
 pub const VDSO_CGT_VER = "LINUX_2.6.39";
 

lib/std/os/bits/linux/x86_64.zig

@@ -420,7 +420,6 @@ pub const MAP_LOCKED = 0x2000;
 /// don't check for reservations
 pub const MAP_NORESERVE = 0x4000;
 
-pub const VDSO_USEFUL = true;
 pub const VDSO_CGT_SYM = "__vdso_clock_gettime";
 pub const VDSO_CGT_VER = "LINUX_2.6";
 pub const VDSO_GETCPU_SYM = "__vdso_getcpu";

lib/std/os/linux.zig

@@ -14,6 +14,7 @@ const vdso = @import("linux/vdso.zig");
 const dl = @import("../dynamic_library.zig");
 
 pub usingnamespace switch (builtin.arch) {
+    .i386 => @import("linux/i386.zig"),
     .x86_64 => @import("linux/x86_64.zig"),
     .aarch64 => @import("linux/arm64.zig"),
     .arm => @import("linux/arm-eabi.zig"),
@@ -743,26 +744,44 @@ pub fn sigismember(set: *const sigset_t, sig: u6) bool {
 }
 
 pub fn getsockname(fd: i32, noalias addr: *sockaddr, noalias len: *socklen_t) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_getsockname, &[3]usize{ @bitCast(usize, @as(isize, fd)), @ptrToInt(addr), @ptrToInt(len) });
+    }
     return syscall3(SYS_getsockname, @bitCast(usize, @as(isize, fd)), @ptrToInt(addr), @ptrToInt(len));
 }
 
 pub fn getpeername(fd: i32, noalias addr: *sockaddr, noalias len: *socklen_t) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_getpeername, &[3]usize{ @bitCast(usize, @as(isize, fd)), @ptrToInt(addr), @ptrToInt(len) });
+    }
     return syscall3(SYS_getpeername, @bitCast(usize, @as(isize, fd)), @ptrToInt(addr), @ptrToInt(len));
 }
 
 pub fn socket(domain: u32, socket_type: u32, protocol: u32) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_socket, &[3]usize{ domain, socket_type, protocol });
+    }
     return syscall3(SYS_socket, domain, socket_type, protocol);
 }
 
 pub fn setsockopt(fd: i32, level: u32, optname: u32, optval: [*]const u8, optlen: socklen_t) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_setsockopt, &[5]usize{ @bitCast(usize, @as(isize, fd)), level, optname, @ptrToInt(optval), @intCast(usize, optlen) });
+    }
     return syscall5(SYS_setsockopt, @bitCast(usize, @as(isize, fd)), level, optname, @ptrToInt(optval), @intCast(usize, optlen));
 }
 
 pub fn getsockopt(fd: i32, level: u32, optname: u32, noalias optval: [*]u8, noalias optlen: *socklen_t) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_getsockopt, &[5]usize{ @bitCast(usize, @as(isize, fd)), level, optname, @ptrToInt(optval), @ptrToInt(optlen) });
+    }
     return syscall5(SYS_getsockopt, @bitCast(usize, @as(isize, fd)), level, optname, @ptrToInt(optval), @ptrToInt(optlen));
 }
 
 pub fn sendmsg(fd: i32, msg: *msghdr_const, flags: u32) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_sendmsg, &[3]usize{ @bitCast(usize, @as(isize, fd)), @ptrToInt(msg), flags });
+    }
     return syscall3(SYS_sendmsg, @bitCast(usize, @as(isize, fd)), @ptrToInt(msg), flags);
 }
 
@@ -807,42 +826,72 @@ pub fn sendmmsg(fd: i32, msgvec: [*]mmsghdr_const, vlen: u32, flags: u32) usize
 }
 
 pub fn connect(fd: i32, addr: *const c_void, len: socklen_t) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_connect, &[3]usize{ @bitCast(usize, @as(isize, fd)), @ptrToInt(addr), len });
+    }
     return syscall3(SYS_connect, @bitCast(usize, @as(isize, fd)), @ptrToInt(addr), len);
 }
 
 pub fn recvmsg(fd: i32, msg: *msghdr, flags: u32) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_recvmsg, &[3]usize{ @bitCast(usize, @as(isize, fd)), @ptrToInt(msg), flags });
+    }
     return syscall3(SYS_recvmsg, @bitCast(usize, @as(isize, fd)), @ptrToInt(msg), flags);
 }
 
 pub fn recvfrom(fd: i32, noalias buf: [*]u8, len: usize, flags: u32, noalias addr: ?*sockaddr, noalias alen: ?*socklen_t) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_recvfrom, &[6]usize{ @bitCast(usize, @as(isize, fd)), @ptrToInt(buf), len, flags, @ptrToInt(addr), @ptrToInt(alen) });
+    }
     return syscall6(SYS_recvfrom, @bitCast(usize, @as(isize, fd)), @ptrToInt(buf), len, flags, @ptrToInt(addr), @ptrToInt(alen));
 }
 
 pub fn shutdown(fd: i32, how: i32) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_shutdown, &[2]usize{ @bitCast(usize, @as(isize, fd)), @bitCast(usize, @as(isize, how)) });
+    }
     return syscall2(SYS_shutdown, @bitCast(usize, @as(isize, fd)), @bitCast(usize, @as(isize, how)));
 }
 
 pub fn bind(fd: i32, addr: *const sockaddr, len: socklen_t) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_bind, &[3]usize{ @bitCast(usize, @as(isize, fd)), @ptrToInt(addr), @intCast(usize, len) });
+    }
     return syscall3(SYS_bind, @bitCast(usize, @as(isize, fd)), @ptrToInt(addr), @intCast(usize, len));
 }
 
 pub fn listen(fd: i32, backlog: u32) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_listen, &[2]usize{ @bitCast(usize, @as(isize, fd)), backlog });
+    }
     return syscall2(SYS_listen, @bitCast(usize, @as(isize, fd)), backlog);
 }
 
 pub fn sendto(fd: i32, buf: [*]const u8, len: usize, flags: u32, addr: ?*const sockaddr, alen: socklen_t) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_sendto, &[6]usize{ @bitCast(usize, @as(isize, fd)), @ptrToInt(buf), len, flags, @ptrToInt(addr), @intCast(usize, alen) });
+    }
     return syscall6(SYS_sendto, @bitCast(usize, @as(isize, fd)), @ptrToInt(buf), len, flags, @ptrToInt(addr), @intCast(usize, alen));
 }
 
 pub fn socketpair(domain: i32, socket_type: i32, protocol: i32, fd: [2]i32) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_socketpair, &[4]usize{ @intCast(usize, domain), @intCast(usize, socket_type), @intCast(usize, protocol), @ptrToInt(&fd[0]) });
+    }
     return syscall4(SYS_socketpair, @intCast(usize, domain), @intCast(usize, socket_type), @intCast(usize, protocol), @ptrToInt(&fd[0]));
 }
 
 pub fn accept(fd: i32, noalias addr: *sockaddr, noalias len: *socklen_t) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_accept, &[4]usize{ fd, addr, len, 0 });
+    }
     return accept4(fd, addr, len, 0);
 }
 
 pub fn accept4(fd: i32, noalias addr: *sockaddr, noalias len: *socklen_t, flags: u32) usize {
+    if (builtin.arch == .i386) {
+        return socketcall(SC_accept4, &[4]usize{ @bitCast(usize, @as(isize, fd)), @ptrToInt(addr), @ptrToInt(len), flags });
+    }
     return syscall4(SYS_accept4, @bitCast(usize, @as(isize, fd)), @ptrToInt(addr), @ptrToInt(len), flags);
 }
 

lib/std/os/linux/i386.zig

@@ -0,0 +1,119 @@
+usingnamespace @import("../bits.zig");
+
+pub fn syscall0(number: usize) usize {
+    return asm volatile ("int $0x80"
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (number)
+        : "memory"
+    );
+}
+
+pub fn syscall1(number: usize, arg1: usize) usize {
+    return asm volatile ("int $0x80"
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (number),
+          [arg1] "{ebx}" (arg1)
+        : "memory"
+    );
+}
+
+pub fn syscall2(number: usize, arg1: usize, arg2: usize) usize {
+    return asm volatile ("int $0x80"
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (number),
+          [arg1] "{ebx}" (arg1),
+          [arg2] "{ecx}" (arg2)
+        : "memory"
+    );
+}
+
+pub fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) usize {
+    return asm volatile ("int $0x80"
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (number),
+          [arg1] "{ebx}" (arg1),
+          [arg2] "{ecx}" (arg2),
+          [arg3] "{edx}" (arg3)
+        : "memory"
+    );
+}
+
+pub fn syscall4(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize) usize {
+    return asm volatile ("int $0x80"
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (number),
+          [arg1] "{ebx}" (arg1),
+          [arg2] "{ecx}" (arg2),
+          [arg3] "{edx}" (arg3),
+          [arg4] "{esi}" (arg4)
+        : "memory"
+    );
+}
+
+pub fn syscall5(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
+    return asm volatile ("int $0x80"
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (number),
+          [arg1] "{ebx}" (arg1),
+          [arg2] "{ecx}" (arg2),
+          [arg3] "{edx}" (arg3),
+          [arg4] "{esi}" (arg4),
+          [arg5] "{edi}" (arg5)
+        : "memory"
+    );
+}
+
+pub fn syscall6(
+    number: usize,
+    arg1: usize,
+    arg2: usize,
+    arg3: usize,
+    arg4: usize,
+    arg5: usize,
+    arg6: usize,
+) usize {
+    return asm volatile (
+        \\  push %%ebp
+        \\  mov %[arg6], %%ebp
+        \\  int $0x80
+        \\  pop %%ebp
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (number),
+          [arg1] "{ebx}" (arg1),
+          [arg2] "{ecx}" (arg2),
+          [arg3] "{edx}" (arg3),
+          [arg4] "{esi}" (arg4),
+          [arg5] "{edi}" (arg5),
+          [arg6] "rm" (arg6)
+        : "memory"
+    );
+}
+
+pub fn socketcall(call: usize, args: [*]usize) usize {
+    return asm volatile ("int $0x80"
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (@as(usize, SYS_socketcall)),
+          [arg1] "{ebx}" (call),
+          [arg2] "{ecx}" (@ptrToInt(args))
+        : "memory"
+    );
+}
+
+/// This matches the libc clone function.
+pub extern fn clone(func: extern fn (arg: usize) u8, stack: usize, flags: u32, arg: usize, ptid: *i32, tls: usize, ctid: *i32) usize;
+
+pub nakedcc fn restore() void {
+    return asm volatile ("int $0x80"
+        :
+        : [number] "{eax}" (@as(usize, SYS_sigreturn))
+        : "memory"
+    );
+}
+
+pub nakedcc fn restore_rt() void {
+    return asm volatile ("int $0x80"
+        :
+        : [number] "{eax}" (@as(usize, SYS_rt_sigreturn))
+        : "memory"
+    );
+}

lib/std/os/linux/tls.zig

@@ -109,12 +109,38 @@ const TLSImage = struct {
     tcb_offset: usize,
     dtv_offset: usize,
     data_offset: usize,
+    // Only used on the i386 architecture
+    gdt_entry_number: usize,
 };
 
 pub var tls_image: ?TLSImage = null;
 
 pub fn setThreadPointer(addr: usize) void {
     switch (builtin.arch) {
+        .i386 => {
+            var user_desc = std.os.linux.user_desc{
+                .entry_number = tls_image.?.gdt_entry_number,
+                .base_addr = addr,
+                .limit = 0xfffff,
+                .seg_32bit = 1,
+                .contents = 0, // Data
+                .read_exec_only = 0,
+                .limit_in_pages = 1,
+                .seg_not_present = 0,
+                .useable = 1,
+            };
+            const rc = std.os.linux.syscall1(std.os.linux.SYS_set_thread_area, @ptrToInt(&user_desc));
+            assert(rc == 0);
+
+            const gdt_entry_number = user_desc.entry_number;
+            // We have to keep track of our slot as it's also needed for clone()
+            tls_image.?.gdt_entry_number = gdt_entry_number;
+            // Update the %gs selector
+            asm volatile ("movl %[gs_val], %%gs"
+                :
+                : [gs_val] "r" (gdt_entry_number << 3 | 3)
+            );
+        },
         .x86_64 => {
             const rc = std.os.linux.syscall2(std.os.linux.SYS_arch_prctl, std.os.linux.ARCH_SET_FS, addr);
             assert(rc == 0);
@@ -238,6 +264,7 @@ pub fn initTLS() ?*elf.Phdr {
             .tcb_offset = tcb_offset,
             .dtv_offset = dtv_offset,
             .data_offset = data_offset,
+            .gdt_entry_number = @bitCast(usize, @as(isize, -1)),
         };
     }
 

lib/std/os/wasi.zig

@@ -12,8 +12,8 @@ comptime {
     assert(@alignOf(u16) == 2);
     assert(@alignOf(i32) == 4);
     assert(@alignOf(u32) == 4);
-    assert(@alignOf(i64) == 8);
+    // assert(@alignOf(i64) == 8);
-    assert(@alignOf(u64) == 8);
+    // assert(@alignOf(u64) == 8);
 }
 
 pub const iovec_t = iovec;

lib/std/special/c.zig

@@ -197,6 +197,49 @@ extern fn __stack_chk_fail() noreturn {
 // across .o file boundaries. fix comptime @ptrCast of nakedcc functions.
 nakedcc fn clone() void {
     switch (builtin.arch) {
+        .i386 => {
+            // __clone(func, stack, flags, arg, ptid, tls, ctid)
+            //         +8,   +12,   +16,   +20, +24,  +28, +32
+            // syscall(SYS_clone, flags, stack, ptid, tls, ctid)
+            //         eax,       ebx,   ecx,   edx,  esi, edi
+            asm volatile (
+                \\  push %%ebp
+                \\  mov %%esp,%%ebp
+                \\  push %%ebx
+                \\  push %%esi
+                \\  push %%edi
+                \\  // Setup the arguments
+                \\  mov 16(%%ebp),%%ebx
+                \\  mov 12(%%ebp),%%ecx
+                \\  and $-16,%%ecx
+                \\  sub $20,%%ecx
+                \\  mov 20(%%ebp),%%eax
+                \\  mov %%eax,4(%%ecx)
+                \\  mov 8(%%ebp),%%eax
+                \\  mov %%eax,0(%%ecx)
+                \\  mov 24(%%ebp),%%edx
+                \\  mov 28(%%ebp),%%esi
+                \\  mov 32(%%ebp),%%edi
+                \\  mov $120,%%eax
+                \\  int $128
+                \\  test %%eax,%%eax
+                \\  jnz 1f
+                \\  pop %%eax
+                \\  xor %%ebp,%%ebp
+                \\  call *%%eax
+                \\  mov %%eax,%%ebx
+                \\  xor %%eax,%%eax
+                \\  inc %%eax
+                \\  int $128
+                \\  hlt
+                \\1:
+                \\  pop %%edi
+                \\  pop %%esi
+                \\  pop %%ebx
+                \\  pop %%ebp
+                \\  ret
+            );
+        },
         .x86_64 => {
             asm volatile (
                 \\      xor %%eax,%%eax

lib/std/thread.zig

@@ -314,11 +314,38 @@ pub const Thread = struct {
                 os.CLONE_THREAD | os.CLONE_SYSVSEM | os.CLONE_PARENT_SETTID | os.CLONE_CHILD_CLEARTID |
                 os.CLONE_DETACHED;
             var newtls: usize = undefined;
+            // This structure is only needed when targeting i386
+            var user_desc: if (builtin.arch == .i386) os.linux.user_desc else void = undefined;
+
             if (os.linux.tls.tls_image) |tls_img| {
-                newtls = os.linux.tls.copyTLS(mmap_addr + tls_start_offset);
+                if (builtin.arch == .i386) {
+                    user_desc = os.linux.user_desc{
+                        .entry_number = tls_img.gdt_entry_number,
+                        .base_addr = os.linux.tls.copyTLS(mmap_addr + tls_start_offset),
+                        .limit = 0xfffff,
+                        .seg_32bit = 1,
+                        .contents = 0, // Data
+                        .read_exec_only = 0,
+                        .limit_in_pages = 1,
+                        .seg_not_present = 0,
+                        .useable = 1,
+                    };
+                    newtls = @ptrToInt(&user_desc);
+                } else {
+                    newtls = os.linux.tls.copyTLS(mmap_addr + tls_start_offset);
+                }
                 flags |= os.CLONE_SETTLS;
             }
-            const rc = os.linux.clone(MainFuncs.linuxThreadMain, mmap_addr + stack_end_offset, flags, arg, &thread_ptr.data.handle, newtls, &thread_ptr.data.handle);
+
+            const rc = os.linux.clone(
+                MainFuncs.linuxThreadMain,
+                mmap_addr + stack_end_offset,
+                flags,
+                arg,
+                &thread_ptr.data.handle,
+                newtls,
+                &thread_ptr.data.handle,
+            );
             switch (os.errno(rc)) {
                 0 => return thread_ptr,
                 os.EAGAIN => return error.ThreadQuotaExceeded,

test/tests.zig

@@ -70,6 +70,26 @@ const test_targets = [_]TestTarget{
         .link_libc = true,
     },
 
+    TestTarget{
+        .target = Target{
+            .Cross = CrossTarget{
+                .os = .linux,
+                .arch = .i386,
+                .abi = .none,
+            },
+        },
+    },
+    TestTarget{
+        .target = Target{
+            .Cross = CrossTarget{
+                .os = .linux,
+                .arch = .i386,
+                .abi = .musl,
+            },
+        },
+        .link_libc = true,
+    },
+
     TestTarget{
         .target = Target{
             .Cross = CrossTarget{
@@ -411,7 +431,7 @@ pub fn addPkgTests(
         const ArchTag = @TagType(builtin.Arch);
         if (test_target.disable_native and
             test_target.target.getOs() == builtin.os and
-            @as(ArchTag,test_target.target.getArch()) == @as(ArchTag,builtin.arch))
+            @as(ArchTag, test_target.target.getArch()) == @as(ArchTag, builtin.arch))
         {
             continue;
         }
@@ -429,7 +449,7 @@ pub fn addPkgTests(
             "bare";
 
         const triple_prefix = if (test_target.target == .Native)
-            @as([]const u8,"native")
+            @as([]const u8, "native")
         else
             test_target.target.zigTripleNoSubArch(b.allocator) catch unreachable;