From 32f4606cece09b6bcf4f553c06c3aaab34f784c6 Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Wed, 28 Aug 2019 16:35:23 +0200
Subject: [PATCH 01/16] add arm32 linux bits definitions

---
 std/os/bits/linux.zig          |   1 +
 std/os/bits/linux/arm-eabi.zig | 510 +++++++++++++++++++++++++++++++++
 2 files changed, 511 insertions(+)
 create mode 100644 std/os/bits/linux/arm-eabi.zig

diff --git a/std/os/bits/linux.zig b/std/os/bits/linux.zig
index c7d8cc2ad2..0617378da9 100644
--- a/std/os/bits/linux.zig
+++ b/std/os/bits/linux.zig
@@ -7,6 +7,7 @@ pub usingnamespace @import("linux/errno.zig");
 pub usingnamespace switch (builtin.arch) {
     .x86_64 => @import("linux/x86_64.zig"),
     .aarch64 => @import("linux/arm64.zig"),
+    .arm => @import("linux/arm-eabi.zig"),
     else => struct {},
 };
 
diff --git a/std/os/bits/linux/arm-eabi.zig b/std/os/bits/linux/arm-eabi.zig
new file mode 100644
index 0000000000..ea4c452eb6
--- /dev/null
+++ b/std/os/bits/linux/arm-eabi.zig
@@ -0,0 +1,510 @@
+// arm-eabi-specific declarations that are intended to be imported into the POSIX namespace.
+
+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;
+
+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_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_mknod = 14;
+pub const SYS_chmod = 15;
+pub const SYS_lchown = 16;
+pub const SYS_lseek = 19;
+pub const SYS_getpid = 20;
+pub const SYS_mount = 21;
+pub const SYS_setuid = 23;
+pub const SYS_getuid = 24;
+pub const SYS_ptrace = 26;
+pub const SYS_pause = 29;
+pub const SYS_access = 33;
+pub const SYS_nice = 34;
+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_brk = 45;
+pub const SYS_setgid = 46;
+pub const SYS_getgid = 47;
+pub const SYS_geteuid = 49;
+pub const SYS_getegid = 50;
+pub const SYS_acct = 51;
+pub const SYS_umount2 = 52;
+pub const SYS_ioctl = 54;
+pub const SYS_fcntl = 55;
+pub const SYS_setpgid = 57;
+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_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_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_symlink = 83;
+pub const SYS_readlink = 85;
+pub const SYS_uselib = 86;
+pub const SYS_swapon = 87;
+pub const SYS_reboot = 88;
+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_statfs = 99;
+pub const SYS_fstatfs = 100;
+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_vhangup = 111;
+pub const SYS_wait4 = 114;
+pub const SYS_swapoff = 115;
+pub const SYS_sysinfo = 116;
+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_adjtimex = 124;
+pub const SYS_mprotect = 125;
+pub const SYS_sigprocmask = 126;
+pub const SYS_init_module = 128;
+pub const SYS_delete_module = 129;
+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_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_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_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_getdents64 = 217;
+pub const SYS_pivot_root = 218;
+pub const SYS_mincore = 219;
+pub const SYS_madvise = 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_io_setup = 243;
+pub const SYS_io_destroy = 244;
+pub const SYS_io_getevents = 245;
+pub const SYS_io_submit = 246;
+pub const SYS_io_cancel = 247;
+pub const SYS_exit_group = 248;
+pub const SYS_lookup_dcookie = 249;
+pub const SYS_epoll_create = 250;
+pub const SYS_epoll_ctl = 251;
+pub const SYS_epoll_wait = 252;
+pub const SYS_remap_file_pages = 253;
+pub const SYS_set_tid_address = 256;
+pub const SYS_timer_create = 257;
+pub const SYS_timer_settime = 258;
+pub const SYS_timer_gettime = 259;
+pub const SYS_timer_getoverrun = 260;
+pub const SYS_timer_delete = 261;
+pub const SYS_clock_settime = 262;
+pub const SYS_clock_gettime = 263;
+pub const SYS_clock_getres = 264;
+pub const SYS_clock_nanosleep = 265;
+pub const SYS_statfs64 = 266;
+pub const SYS_fstatfs64 = 267;
+pub const SYS_tgkill = 268;
+pub const SYS_utimes = 269;
+pub const SYS_arm_fadvise64_64 = 270;
+pub const SYS_pciconfig_iobase = 271;
+pub const SYS_pciconfig_read = 272;
+pub const SYS_pciconfig_write = 273;
+pub const SYS_mq_open = 274;
+pub const SYS_mq_unlink = 275;
+pub const SYS_mq_timedsend = 276;
+pub const SYS_mq_timedreceive = 277;
+pub const SYS_mq_notify = 278;
+pub const SYS_mq_getsetattr = 279;
+pub const SYS_waitid = 280;
+pub const SYS_socket = 281;
+pub const SYS_bind = 282;
+pub const SYS_connect = 283;
+pub const SYS_listen = 284;
+pub const SYS_accept = 285;
+pub const SYS_getsockname = 286;
+pub const SYS_getpeername = 287;
+pub const SYS_socketpair = 288;
+pub const SYS_send = 289;
+pub const SYS_sendto = 290;
+pub const SYS_recv = 291;
+pub const SYS_recvfrom = 292;
+pub const SYS_shutdown = 293;
+pub const SYS_setsockopt = 294;
+pub const SYS_getsockopt = 295;
+pub const SYS_sendmsg = 296;
+pub const SYS_recvmsg = 297;
+pub const SYS_semop = 298;
+pub const SYS_semget = 299;
+pub const SYS_semctl = 300;
+pub const SYS_msgsnd = 301;
+pub const SYS_msgrcv = 302;
+pub const SYS_msgget = 303;
+pub const SYS_msgctl = 304;
+pub const SYS_shmat = 305;
+pub const SYS_shmdt = 306;
+pub const SYS_shmget = 307;
+pub const SYS_shmctl = 308;
+pub const SYS_add_key = 309;
+pub const SYS_request_key = 310;
+pub const SYS_keyctl = 311;
+pub const SYS_semtimedop = 312;
+pub const SYS_vserver = 313;
+pub const SYS_ioprio_set = 314;
+pub const SYS_ioprio_get = 315;
+pub const SYS_inotify_init = 316;
+pub const SYS_inotify_add_watch = 317;
+pub const SYS_inotify_rm_watch = 318;
+pub const SYS_mbind = 319;
+pub const SYS_get_mempolicy = 320;
+pub const SYS_set_mempolicy = 321;
+pub const SYS_openat = 322;
+pub const SYS_mkdirat = 323;
+pub const SYS_mknodat = 324;
+pub const SYS_fchownat = 325;
+pub const SYS_futimesat = 326;
+pub const SYS_fstatat64 = 327;
+pub const SYS_unlinkat = 328;
+pub const SYS_renameat = 329;
+pub const SYS_linkat = 330;
+pub const SYS_symlinkat = 331;
+pub const SYS_readlinkat = 332;
+pub const SYS_fchmodat = 333;
+pub const SYS_faccessat = 334;
+pub const SYS_pselect6 = 335;
+pub const SYS_ppoll = 336;
+pub const SYS_unshare = 337;
+pub const SYS_set_robust_list = 338;
+pub const SYS_get_robust_list = 339;
+pub const SYS_splice = 340;
+pub const SYS_arm_sync_file_range = 341;
+pub const SYS_tee = 342;
+pub const SYS_vmsplice = 343;
+pub const SYS_move_pages = 344;
+pub const SYS_getcpu = 345;
+pub const SYS_epoll_pwait = 346;
+pub const SYS_kexec_load = 347;
+pub const SYS_utimensat = 348;
+pub const SYS_signalfd = 349;
+pub const SYS_timerfd_create = 350;
+pub const SYS_eventfd = 351;
+pub const SYS_fallocate = 352;
+pub const SYS_timerfd_settime = 353;
+pub const SYS_timerfd_gettime = 354;
+pub const SYS_signalfd4 = 355;
+pub const SYS_eventfd2 = 356;
+pub const SYS_epoll_create1 = 357;
+pub const SYS_dup3 = 358;
+pub const SYS_pipe2 = 359;
+pub const SYS_inotify_init1 = 360;
+pub const SYS_preadv = 361;
+pub const SYS_pwritev = 362;
+pub const SYS_rt_tgsigqueueinfo = 363;
+pub const SYS_perf_event_open = 364;
+pub const SYS_recvmmsg = 365;
+pub const SYS_accept4 = 366;
+pub const SYS_fanotify_init = 367;
+pub const SYS_fanotify_mark = 368;
+pub const SYS_prlimit64 = 369;
+pub const SYS_name_to_handle_at = 370;
+pub const SYS_open_by_handle_at = 371;
+pub const SYS_clock_adjtime = 372;
+pub const SYS_syncfs = 373;
+pub const SYS_sendmmsg = 374;
+pub const SYS_setns = 375;
+pub const SYS_process_vm_readv = 376;
+pub const SYS_process_vm_writev = 377;
+pub const SYS_kcmp = 378;
+pub const SYS_finit_module = 379;
+pub const SYS_sched_setattr = 380;
+pub const SYS_sched_getattr = 381;
+pub const SYS_renameat2 = 382;
+pub const SYS_seccomp = 383;
+pub const SYS_getrandom = 384;
+pub const SYS_memfd_create = 385;
+pub const SYS_bpf = 386;
+pub const SYS_execveat = 387;
+pub const SYS_userfaultfd = 388;
+pub const SYS_membarrier = 389;
+pub const SYS_mlock2 = 390;
+pub const SYS_copy_file_range = 391;
+pub const SYS_preadv2 = 392;
+pub const SYS_pwritev2 = 393;
+pub const SYS_pkey_mprotect = 394;
+pub const SYS_pkey_alloc = 395;
+pub const SYS_pkey_free = 396;
+pub const SYS_statx = 397;
+pub const SYS_rseq = 398;
+pub const SYS_io_pgetevents = 399;
+
+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 = 0o40000;
+pub const O_NOFOLLOW = 0o100000;
+pub const O_CLOEXEC = 0o2000000;
+
+pub const O_ASYNC = 0o20000;
+pub const O_DIRECT = 0o200000;
+pub const O_LARGEFILE = 0o400000;
+pub const O_NOATIME = 0o1000000;
+pub const O_PATH = 0o10000000;
+pub const O_TMPFILE = 0o20040000;
+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;
+
+/// stack-like segment
+pub const MAP_GROWSDOWN = 0x0100;
+
+/// ETXTBSY
+pub const MAP_DENYWRITE = 0x0800;
+
+/// mark it as an executable
+pub const MAP_EXECUTABLE = 0x1000;
+
+/// pages are locked
+pub const MAP_LOCKED = 0x2000;
+
+/// don't check for reservations
+pub const MAP_NORESERVE = 0x4000;
+
+/// populate (prefault) pagetables
+pub const MAP_POPULATE = 0x8000;
+
+/// do not block on IO
+pub const MAP_NONBLOCK = 0x10000;
+
+/// give out an address that is best suited for process/thread stacks
+pub const MAP_STACK = 0x20000;
+
+/// create a huge page mapping
+pub const MAP_HUGETLB = 0x40000;
+
+/// perform synchronous page faults for the mapping
+pub const MAP_SYNC = 0x80000;
+
+pub const VDSO_USEFUL = true;
+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,
+};
+
+/// 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: u64,
+    __dev_patting: u32,
+    __ino_truncated: u32,
+    mode: u32,
+    nlink: u32,
+    uid: u32,
+    gid: u32,
+    rdev: u64,
+    __rdev_padding: u32,
+    size: i64,
+    blksize: i32,
+    blocks: i64,
+    atim: timespec,
+    mtim: timespec,
+    ctim: timespec,
+    ino: u64,
+
+    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,
+};

From 50c37c75d1208bb8a0bf5b2792e4a1d69d6f7110 Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Wed, 28 Aug 2019 17:41:49 +0200
Subject: [PATCH 02/16] add arm32 syscall conventions

---
 std/os/linux.zig          |  1 +
 std/os/linux/arm-eabi.zig | 80 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+)
 create mode 100644 std/os/linux/arm-eabi.zig

diff --git a/std/os/linux.zig b/std/os/linux.zig
index 053f30d265..ba679387dd 100644
--- a/std/os/linux.zig
+++ b/std/os/linux.zig
@@ -17,6 +17,7 @@ pub const is_the_target = builtin.os == .linux;
 pub usingnamespace switch (builtin.arch) {
     .x86_64 => @import("linux/x86_64.zig"),
     .aarch64 => @import("linux/arm64.zig"),
+    .arm => @import("linux/arm-eabi.zig"),
     else => struct {},
 };
 pub usingnamespace @import("bits.zig");
diff --git a/std/os/linux/arm-eabi.zig b/std/os/linux/arm-eabi.zig
new file mode 100644
index 0000000000..3b8eb055d5
--- /dev/null
+++ b/std/os/linux/arm-eabi.zig
@@ -0,0 +1,80 @@
+pub fn syscall0(number: usize) usize {
+    return asm volatile ("svc #0"
+        : [ret] "={r0}" (-> usize)
+        : [number] "{r7}" (number)
+    );
+}
+
+pub fn syscall1(number: usize, arg1: usize) usize {
+    return asm volatile ("svc #0"
+        : [ret] "={r0}" (-> usize)
+        : [number] "{r7}" (number),
+          [arg1] "{r0}" (arg1)
+    );
+}
+
+pub fn syscall2(number: usize, arg1: usize, arg2: usize) usize {
+    return asm volatile ("svc #0"
+        : [ret] "={r0}" (-> usize)
+        : [number] "{r7}" (number),
+          [arg1] "{r0}" (arg1),
+          [arg2] "{r1}" (arg2)
+    );
+}
+
+pub fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) usize {
+    return asm volatile ("svc #0"
+        : [ret] "={r0}" (-> usize)
+        : [number] "{r7}" (number),
+          [arg1] "{r0}" (arg1),
+          [arg2] "{r1}" (arg2),
+          [arg3] "{r2}" (arg3)
+    );
+}
+
+pub fn syscall4(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize) usize {
+    return asm volatile ("svc #0"
+        : [ret] "={r0}" (-> usize)
+        : [number] "{r7}" (number),
+          [arg1] "{r0}" (arg1),
+          [arg2] "{r1}" (arg2),
+          [arg3] "{r2}" (arg3),
+          [arg4] "{r3}" (arg4)
+    );
+}
+
+pub fn syscall5(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
+    return asm volatile ("svc #0"
+        : [ret] "={r0}" (-> usize)
+        : [number] "{r7}" (number),
+          [arg1] "{r0}" (arg1),
+          [arg2] "{r1}" (arg2),
+          [arg3] "{r2}" (arg3),
+          [arg4] "{r3}" (arg4),
+          [arg5] "{r4}" (arg5)
+    );
+}
+
+pub fn syscall6(
+    number: usize,
+    arg1: usize,
+    arg2: usize,
+    arg3: usize,
+    arg4: usize,
+    arg5: usize,
+    arg6: usize,
+) usize {
+    return asm volatile ("svc #0"
+        : [ret] "={r0}" (-> usize)
+        : [number] "{r7}" (number),
+          [arg1] "{r0}" (arg1),
+          [arg2] "{r1}" (arg2),
+          [arg3] "{r2}" (arg3),
+          [arg4] "{r3}" (arg4),
+          [arg5] "{r4}" (arg5),
+          [arg6] "{r5}" (arg6)
+    );
+}
+
+/// 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;

From 223b773e038b7af6ee1dec1c69836c135049d1ba Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Thu, 29 Aug 2019 00:54:57 +0200
Subject: [PATCH 03/16] Add more syscall constants

---
 std/os/bits/linux/arm-eabi.zig | 35 ++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/std/os/bits/linux/arm-eabi.zig b/std/os/bits/linux/arm-eabi.zig
index ea4c452eb6..956e40a2ce 100644
--- a/std/os/bits/linux/arm-eabi.zig
+++ b/std/os/bits/linux/arm-eabi.zig
@@ -231,6 +231,7 @@ pub const SYS_statfs64 = 266;
 pub const SYS_fstatfs64 = 267;
 pub const SYS_tgkill = 268;
 pub const SYS_utimes = 269;
+pub const SYS_fadvise64_64 = 270;
 pub const SYS_arm_fadvise64_64 = 270;
 pub const SYS_pciconfig_iobase = 271;
 pub const SYS_pciconfig_read = 272;
@@ -302,6 +303,7 @@ pub const SYS_unshare = 337;
 pub const SYS_set_robust_list = 338;
 pub const SYS_get_robust_list = 339;
 pub const SYS_splice = 340;
+pub const SYS_sync_file_range2 = 341;
 pub const SYS_arm_sync_file_range = 341;
 pub const SYS_tee = 342;
 pub const SYS_vmsplice = 343;
@@ -361,6 +363,39 @@ pub const SYS_pkey_free = 396;
 pub const SYS_statx = 397;
 pub const SYS_rseq = 398;
 pub const SYS_io_pgetevents = 399;
+pub const SYS_migrate_pages = 400;
+pub const SYS_kexec_file_load = 401;
+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_breakpoint = 0x0f0001;
+pub const SYS_cacheflush = 0x0f0002;
+pub const SYS_usr26 = 0x0f0003;
+pub const SYS_usr32 = 0x0f0004;
+pub const SYS_set_tls = 0x0f0005;
+pub const SYS_get_tls = 0x0f0006;
 
 pub const O_CREAT = 0o100;
 pub const O_EXCL = 0o200;

From 57de61084e1a805838243e5428e774a591197454 Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Thu, 29 Aug 2019 00:55:22 +0200
Subject: [PATCH 04/16] Make mmap use SYS_mmap2 if it exists

---
 std/os/bits/linux/arm-eabi.zig | 2 ++
 std/os/linux.zig               | 6 +++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/std/os/bits/linux/arm-eabi.zig b/std/os/bits/linux/arm-eabi.zig
index 956e40a2ce..1b45588459 100644
--- a/std/os/bits/linux/arm-eabi.zig
+++ b/std/os/bits/linux/arm-eabi.zig
@@ -397,6 +397,8 @@ pub const SYS_usr32 = 0x0f0004;
 pub const SYS_set_tls = 0x0f0005;
 pub const SYS_get_tls = 0x0f0006;
 
+pub const MMAP2_UNIT = 4096;
+
 pub const O_CREAT = 0o100;
 pub const O_EXCL = 0o200;
 pub const O_NOCTTY = 0o400;
diff --git a/std/os/linux.zig b/std/os/linux.zig
index ba679387dd..7d019001ef 100644
--- a/std/os/linux.zig
+++ b/std/os/linux.zig
@@ -190,7 +190,11 @@ pub fn umount2(special: [*]const u8, flags: u32) usize {
 }
 
 pub fn mmap(address: ?[*]u8, length: usize, prot: usize, flags: u32, fd: i32, offset: isize) usize {
-    return syscall6(SYS_mmap, @ptrToInt(address), length, prot, flags, @bitCast(usize, isize(fd)), @bitCast(usize, offset));
+    if (@hasDecl(@This(), "SYS_mmap2")) {
+        return syscall6(SYS_mmap2, @ptrToInt(address), length, prot, flags, @bitCast(usize, isize(fd)), @bitCast(usize, @divTrunc(offset, MMAP2_UNIT)));
+    } else {
+        return syscall6(SYS_mmap, @ptrToInt(address), length, prot, flags, @bitCast(usize, isize(fd)), @bitCast(usize, offset));
+    }
 }
 
 pub fn mprotect(address: [*]const u8, length: usize, protection: usize) usize {

From b3ac323a448e1e8a816eab64777b855396afe6c8 Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Thu, 29 Aug 2019 01:14:43 +0200
Subject: [PATCH 05/16] TLS initialization, clone definition and _start
 functionality

---
 std/os/linux/tls.zig  |  3 +++
 std/special/c.zig     | 29 +++++++++++++++++++++++++++++
 std/special/start.zig |  2 +-
 3 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/std/os/linux/tls.zig b/std/os/linux/tls.zig
index a10d68663b..63c44d6982 100644
--- a/std/os/linux/tls.zig
+++ b/std/os/linux/tls.zig
@@ -118,6 +118,9 @@ pub fn setThreadPointer(addr: usize) void {
                 : [addr] "r" (addr)
             );
         },
+        .arm => |arm| {
+            _ = std.os.linux.syscall1(std.os.linux.SYS_set_tls, addr);
+        },
         else => @compileError("Unsupported architecture"),
     }
 }
diff --git a/std/special/c.zig b/std/special/c.zig
index 7300b8bf74..5ac7457429 100644
--- a/std/special/c.zig
+++ b/std/special/c.zig
@@ -238,6 +238,35 @@ nakedcc fn clone() void {
             \\      mov x8,#93 // SYS_exit
             \\      svc #0
         );
+    } else if (builtin.arch == builtin.Arch.arm) {
+        asm volatile (
+            \\    stmfd sp!,{r4,r5,r6,r7}
+            \\    mov r7,#120
+            \\    mov r6,r3
+            \\    mov r5,r0
+            \\    mov r0,r2
+            \\    and r1,r1,#-16
+            \\    ldr r2,[sp,#16]
+            \\    ldr r3,[sp,#20]
+            \\    ldr r4,[sp,#24]
+            \\    svc 0
+            \\    tst r0,r0
+            \\    beq 1f
+            \\    ldmfd sp!,{r4,r5,r6,r7}
+            \\    bx lr
+            \\
+            \\1:  mov r0,r6
+            \\    tst r5,#1
+            \\    bne 1f
+            \\    mov lr,pc
+            \\    mov pc,r5
+            \\2:  mov r7,#1
+            \\    svc 0
+            \\
+            \\1:  mov lr,pc
+            \\    bx r5
+            \\    b 2b
+        );
     } else {
         @compileError("Implement clone() for this arch.");
     }
diff --git a/std/special/start.zig b/std/special/start.zig
index 3427ff422d..fde79a4baf 100644
--- a/std/special/start.zig
+++ b/std/special/start.zig
@@ -44,7 +44,7 @@ nakedcc fn _start() noreturn {
                 : [argc] "={esp}" (-> [*]usize)
             );
         },
-        .aarch64, .aarch64_be => {
+        .aarch64, .aarch64_be, .arm => {
             argc_ptr = asm ("mov %[argc], sp"
                 : [argc] "=r" (-> [*]usize)
             );

From 108a51b11032ba3ed7864a653f87283853e6e318 Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Thu, 29 Aug 2019 10:34:05 +0200
Subject: [PATCH 06/16] fix issues with debug.zig

- Use sys_*stat*64 instead of sys_*stat* where appropriate
- Fix overflow when calculating atime, ctime and mtime on File.stat()
- Fix compilation error casting getEndPos to usize.
---
 std/debug.zig                  |  2 +-
 std/fs/file.zig                |  6 +++---
 std/os/bits/linux/arm-eabi.zig |  4 ++--
 std/os/linux.zig               | 24 ++++++++++++++++++++----
 4 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/std/debug.zig b/std/debug.zig
index d1c17343ef..a6ef60b663 100644
--- a/std/debug.zig
+++ b/std/debug.zig
@@ -1053,7 +1053,7 @@ fn openSelfDebugInfoPosix(allocator: *mem.Allocator) !DwarfInfo {
     S.self_exe_file = try fs.openSelfExe();
     errdefer S.self_exe_file.close();
 
-    const self_exe_mmap_len = mem.alignForward(try S.self_exe_file.getEndPos(), mem.page_size);
+    const self_exe_mmap_len = mem.alignForward(@intCast(usize, try S.self_exe_file.getEndPos()), mem.page_size);
     const self_exe_mmap = try os.mmap(
         null,
         self_exe_mmap_len,
diff --git a/std/fs/file.zig b/std/fs/file.zig
index 0014693d40..83cbe23780 100644
--- a/std/fs/file.zig
+++ b/std/fs/file.zig
@@ -261,9 +261,9 @@ pub const File = struct {
         return Stat{
             .size = @bitCast(u64, st.size),
             .mode = st.mode,
-            .atime = atime.tv_sec * std.time.ns_per_s + atime.tv_nsec,
-            .mtime = mtime.tv_sec * std.time.ns_per_s + mtime.tv_nsec,
-            .ctime = ctime.tv_sec * std.time.ns_per_s + ctime.tv_nsec,
+            .atime = @intCast(i64, atime.tv_sec) * std.time.ns_per_s + atime.tv_nsec,
+            .mtime = @intCast(i64, mtime.tv_sec) * std.time.ns_per_s + mtime.tv_nsec,
+            .ctime = @intCast(i64, ctime.tv_sec) * std.time.ns_per_s + ctime.tv_nsec,
         };
     }
 
diff --git a/std/os/bits/linux/arm-eabi.zig b/std/os/bits/linux/arm-eabi.zig
index 1b45588459..5048a2afc7 100644
--- a/std/os/bits/linux/arm-eabi.zig
+++ b/std/os/bits/linux/arm-eabi.zig
@@ -502,7 +502,7 @@ pub const msghdr_const = extern struct {
 /// methods to accomplish this.
 pub const Stat = extern struct {
     dev: u64,
-    __dev_patting: u32,
+    __dev_padding: u32,
     __ino_truncated: u32,
     mode: u32,
     nlink: u32,
@@ -512,7 +512,7 @@ pub const Stat = extern struct {
     __rdev_padding: u32,
     size: i64,
     blksize: i32,
-    blocks: i64,
+    blocks: u64,
     atim: timespec,
     mtim: timespec,
     ctim: timespec,
diff --git a/std/os/linux.zig b/std/os/linux.zig
index 7d019001ef..3134ebf641 100644
--- a/std/os/linux.zig
+++ b/std/os/linux.zig
@@ -713,22 +713,38 @@ pub fn accept4(fd: i32, noalias addr: *sockaddr, noalias len: *socklen_t, flags:
 }
 
 pub fn fstat(fd: i32, stat_buf: *Stat) usize {
-    return syscall2(SYS_fstat, @bitCast(usize, isize(fd)), @ptrToInt(stat_buf));
+    if (@hasDecl(@This(), "SYS_fstat64")) {
+        return syscall2(SYS_fstat64, @bitCast(usize, isize(fd)), @ptrToInt(stat_buf));
+    } else {
+        return syscall2(SYS_fstat, @bitCast(usize, isize(fd)), @ptrToInt(stat_buf));
+    }
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn stat(pathname: [*]const u8, statbuf: *Stat) usize {
-    return syscall2(SYS_stat, @ptrToInt(pathname), @ptrToInt(statbuf));
+    if (@hasDecl(@This(), "SYS_stat64")) {
+        return syscall2(SYS_stat64, @ptrToInt(pathname), @ptrToInt(statbuf));
+    } else {
+        return syscall2(SYS_stat, @ptrToInt(pathname), @ptrToInt(statbuf));
+    }
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn lstat(pathname: [*]const u8, statbuf: *Stat) usize {
-    return syscall2(SYS_lstat, @ptrToInt(pathname), @ptrToInt(statbuf));
+    if (@hasDecl(@This(), "SYS_lstat64")) {
+        return syscall2(SYS_lstat64, @ptrToInt(pathname), @ptrToInt(statbuf));
+    } else {
+        return syscall2(SYS_lstat, @ptrToInt(pathname), @ptrToInt(statbuf));
+    }
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn fstatat(dirfd: i32, path: [*]const u8, stat_buf: *Stat, flags: u32) usize {
-    return syscall4(SYS_fstatat, @bitCast(usize, isize(dirfd)), @ptrToInt(path), @ptrToInt(stat_buf), flags);
+    if (@hasDecl(@This(), "SYS_fstatat64")) {
+        return syscall4(SYS_fstatat64, @bitCast(usize, isize(dirfd)), @ptrToInt(path), @ptrToInt(stat_buf), flags);
+    } else {
+        return syscall4(SYS_fstatat, @bitCast(usize, isize(dirfd)), @ptrToInt(path), @ptrToInt(stat_buf), flags);
+    }
 }
 
 // TODO https://github.com/ziglang/zig/issues/265

From e4c262b804dded7e47aea0bb61f4578b94a7fa86 Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Thu, 29 Aug 2019 10:52:50 +0200
Subject: [PATCH 07/16] Don't print line info if source is not available

---
 std/debug.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/std/debug.zig b/std/debug.zig
index a6ef60b663..8918426e47 100644
--- a/std/debug.zig
+++ b/std/debug.zig
@@ -793,7 +793,7 @@ fn printLineInfo(
                 try out_stream.write(GREEN ++ "^" ++ RESET ++ "\n");
             }
         } else |err| switch (err) {
-            error.EndOfFile => {},
+            error.EndOfFile, error.FileNotFound  => {},
             else => return err,
         }
     } else {

From 2323da3a680f48207d35db26f63ea0553e74d956 Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Thu, 29 Aug 2019 18:12:58 +0200
Subject: [PATCH 08/16] add __aeabi_read_tp

---
 std/os/bits/linux/arm-eabi.zig | 24 ++++++++++++++++++++++++
 std/os/linux/arm-eabi.zig      |  8 ++++++++
 std/os/linux/tls.zig           | 12 ++++++++++++
 std/special/c.zig              |  2 ++
 4 files changed, 46 insertions(+)

diff --git a/std/os/bits/linux/arm-eabi.zig b/std/os/bits/linux/arm-eabi.zig
index 5048a2afc7..ca80b67fe1 100644
--- a/std/os/bits/linux/arm-eabi.zig
+++ b/std/os/bits/linux/arm-eabi.zig
@@ -474,6 +474,30 @@ pub const VDSO_USEFUL = true;
 pub const VDSO_CGT_SYM = "__vdso_clock_gettime";
 pub const VDSO_CGT_VER = "LINUX_2.6";
 
+pub const HWCAP_SWP = 1 << 0;
+pub const HWCAP_HALF = 1 << 1;
+pub const HWCAP_THUMB = 1 << 2;
+pub const HWCAP_26BIT = 1 << 3;
+pub const HWCAP_FAST_MULT = 1 << 4;
+pub const HWCAP_FPA = 1 << 5;
+pub const HWCAP_VFP = 1 << 6;
+pub const HWCAP_EDSP = 1 << 7;
+pub const HWCAP_JAVA = 1 << 8;
+pub const HWCAP_IWMMXT = 1 << 9;
+pub const HWCAP_CRUNCH = 1 << 10;
+pub const HWCAP_THUMBEE = 1 << 11;
+pub const HWCAP_NEON = 1 << 12;
+pub const HWCAP_VFPv3 = 1 << 13;
+pub const HWCAP_VFPv3D16 = 1 << 14;
+pub const HWCAP_TLS = 1 << 15;
+pub const HWCAP_VFPv4 = 1 << 16;
+pub const HWCAP_IDIVA = 1 << 17;
+pub const HWCAP_IDIVT = 1 << 18;
+pub const HWCAP_VFPD32 = 1 << 19;
+pub const HWCAP_IDIV = HWCAP_IDIVA | HWCAP_IDIVT;
+pub const HWCAP_LPAE = 1 << 20;
+pub const HWCAP_EVTSTRM = 1 << 21;
+
 pub const msghdr = extern struct {
     msg_name: ?*sockaddr,
     msg_namelen: socklen_t,
diff --git a/std/os/linux/arm-eabi.zig b/std/os/linux/arm-eabi.zig
index 3b8eb055d5..a8cb52d711 100644
--- a/std/os/linux/arm-eabi.zig
+++ b/std/os/linux/arm-eabi.zig
@@ -78,3 +78,11 @@ pub fn syscall6(
 
 /// 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;
+
+// LLVM calls this when the read-tp-hard feature is set to false. Currently, there is no way to pass
+// that to llvm via zig. See https://github.com/ziglang/zig/issues/2883
+pub nakedcc fn getThreadPointer() usize {
+    return asm volatile("mrc p15, 0, %[ret], c13, c0, 3"
+        : [ret] "=r" (-> usize)
+    );
+}
\ No newline at end of file
diff --git a/std/os/linux/tls.zig b/std/os/linux/tls.zig
index 63c44d6982..a14b26a5cf 100644
--- a/std/os/linux/tls.zig
+++ b/std/os/linux/tls.zig
@@ -133,6 +133,7 @@ pub fn initTLS() void {
     var at_phent: usize = undefined;
     var at_phnum: usize = undefined;
     var at_phdr: usize = undefined;
+    var at_hwcap: usize = undefined;
 
     var i: usize = 0;
     while (auxv[i].a_type != std.elf.AT_NULL) : (i += 1) {
@@ -140,10 +141,21 @@ pub fn initTLS() void {
             elf.AT_PHENT => at_phent = auxv[i].a_un.a_val,
             elf.AT_PHNUM => at_phnum = auxv[i].a_un.a_val,
             elf.AT_PHDR => at_phdr = auxv[i].a_un.a_val,
+            elf.AT_HWCAP => at_phdr = auxv[i].a_un.a_val,
             else => continue,
         }
     }
 
+    // If the cpu is arm-based, check if it supports the TLS register
+    if (builtin.arch == builtin.Arch.arm and builtin.os == .linux) {
+        if (at_hwcap & std.os.linux.HWCAP_TLS == 0) {
+            // If the CPU does not support TLS via a coprocessor register,
+            // it could be accessed via a kernel helper function
+            // see musl/src/thread/arm/ for details
+            @panic("cpu does not support TLS via coprocessor register");
+        }
+    }
+
     // Sanity check
     assert(at_phent == @sizeOf(elf.Phdr));
 
diff --git a/std/special/c.zig b/std/special/c.zig
index 5ac7457429..669a771c2e 100644
--- a/std/special/c.zig
+++ b/std/special/c.zig
@@ -25,6 +25,8 @@ comptime {
         @export("strncmp", strncmp, .Strong);
         @export("strerror", strerror, .Strong);
         @export("strlen", strlen, .Strong);
+    } else if (builtin.arch == builtin.Arch.arm and builtin.os == .linux) {
+        @export("__aeabi_read_tp", std.os.linux.getThreadPointer, .Strong);
     }
 }
 

From c1f8b201a1419e1f86c116c67de2f5a8c58b9a84 Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Fri, 30 Aug 2019 12:58:44 +0200
Subject: [PATCH 09/16] Improve comments near un-implemented functionality

---
 std/os/linux/arm-eabi.zig | 3 ++-
 std/os/linux/tls.zig      | 6 +++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/std/os/linux/arm-eabi.zig b/std/os/linux/arm-eabi.zig
index a8cb52d711..1167c10f0b 100644
--- a/std/os/linux/arm-eabi.zig
+++ b/std/os/linux/arm-eabi.zig
@@ -80,7 +80,8 @@ pub fn syscall6(
 pub extern fn clone(func: extern fn (arg: usize) u8, stack: usize, flags: u32, arg: usize, ptid: *i32, tls: usize, ctid: *i32) usize;
 
 // LLVM calls this when the read-tp-hard feature is set to false. Currently, there is no way to pass
-// that to llvm via zig. See https://github.com/ziglang/zig/issues/2883
+// that to llvm via zig, see https://github.com/ziglang/zig/issues/2883.
+// LLVM expects libc to provide this function as __aeabi_read_tp, so it is exported if needed from special/c.zig.
 pub nakedcc fn getThreadPointer() usize {
     return asm volatile("mrc p15, 0, %[ret], c13, c0, 3"
         : [ret] "=r" (-> usize)
diff --git a/std/os/linux/tls.zig b/std/os/linux/tls.zig
index a14b26a5cf..1b2687b82c 100644
--- a/std/os/linux/tls.zig
+++ b/std/os/linux/tls.zig
@@ -150,9 +150,9 @@ pub fn initTLS() void {
     if (builtin.arch == builtin.Arch.arm and builtin.os == .linux) {
         if (at_hwcap & std.os.linux.HWCAP_TLS == 0) {
             // If the CPU does not support TLS via a coprocessor register,
-            // it could be accessed via a kernel helper function
-            // see musl/src/thread/arm/ for details
-            @panic("cpu does not support TLS via coprocessor register");
+            // a kernel helper function can be used instead on certain linux kernels.
+            // See linux/arch/arm/include/asm/tls.h and musl/src/thread/arm/__set_thread_area.c.
+            @panic("TODO: Implement ARM fallback TLS functionality");
         }
     }
 

From 4b8325f3815c7fa774bb06ef5d190f039723222b Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Fri, 30 Aug 2019 13:02:15 +0200
Subject: [PATCH 10/16] Remove unneeded os check

---
 std/os/linux/tls.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/std/os/linux/tls.zig b/std/os/linux/tls.zig
index 1b2687b82c..8920e28a5b 100644
--- a/std/os/linux/tls.zig
+++ b/std/os/linux/tls.zig
@@ -147,7 +147,7 @@ pub fn initTLS() void {
     }
 
     // If the cpu is arm-based, check if it supports the TLS register
-    if (builtin.arch == builtin.Arch.arm and builtin.os == .linux) {
+    if (builtin.arch == builtin.Arch.arm) {
         if (at_hwcap & std.os.linux.HWCAP_TLS == 0) {
             // If the CPU does not support TLS via a coprocessor register,
             // a kernel helper function can be used instead on certain linux kernels.

From e39c93a2f346e4bfb2653ccf231d736dfb9bce6e Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Sun, 1 Sep 2019 11:54:57 +0200
Subject: [PATCH 11/16] Replace legacy 16-bit syscalls with 32-bit versions
 when appropriate

---
 std/os/linux.zig | 84 ++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 70 insertions(+), 14 deletions(-)

diff --git a/std/os/linux.zig b/std/os/linux.zig
index 3134ebf641..e24ba441cc 100644
--- a/std/os/linux.zig
+++ b/std/os/linux.zig
@@ -486,35 +486,67 @@ pub fn nanosleep(req: *const timespec, rem: ?*timespec) usize {
 }
 
 pub fn setuid(uid: u32) usize {
-    return syscall1(SYS_setuid, uid);
+    if (@hasDecl(@This(), "SYS_setuid32")) {
+        return syscall1(SYS_setuid32, uid);
+    } else {
+        return syscall1(SYS_setuid, uid);
+    }
 }
 
 pub fn setgid(gid: u32) usize {
-    return syscall1(SYS_setgid, gid);
+    if (@hasDecl(@This(), "SYS_setgid32")) {
+        return syscall1(SYS_setgid32, gid);
+    } else {
+        return syscall1(SYS_setgid, gid);
+    }
 }
 
 pub fn setreuid(ruid: u32, euid: u32) usize {
-    return syscall2(SYS_setreuid, ruid, euid);
+    if (@hasDecl(@This(), "SYS_setreuid32")) {
+        return syscall2(SYS_setreuid32, ruid, euid));
+    } else {
+        return syscall2(SYS_setreuid, ruid, euid));
+    }
 }
 
 pub fn setregid(rgid: u32, egid: u32) usize {
-    return syscall2(SYS_setregid, rgid, egid);
+    if (@hasDecl(@This(), "SYS_setregid32")) {
+        return syscall2(SYS_setregid32, rgid, egid);
+    } else {
+        return syscall2(SYS_setregid, rgid, egid);
+    }
 }
 
 pub fn getuid() u32 {
-    return u32(syscall0(SYS_getuid));
+    if (@hasDecl(@This(), "SYS_getuid32")) {
+        return u32(syscall0(SYS_getuid32));
+    } else {
+        return u32(syscall0(SYS_getuid));
+    }
 }
 
 pub fn getgid() u32 {
-    return u32(syscall0(SYS_getgid));
+    if (@hasDecl(@This(), "SYS_getgid32")) {
+        return u32(syscall0(SYS_getgid32));
+    } else {
+        return u32(syscall0(SYS_getgid));
+    }
 }
 
 pub fn geteuid() u32 {
-    return u32(syscall0(SYS_geteuid));
+    if (@hasDecl(@This(), "SYS_geteuid32")) {
+        return u32(syscall0(SYS_geteuid32));
+    } else {
+        return u32(syscall0(SYS_geteuid));
+    }
 }
 
 pub fn getegid() u32 {
-    return u32(syscall0(SYS_getegid));
+    if (@hasDecl(@This(), "SYS_getegid32")) {
+        return u32(syscall0(SYS_getegid32));
+    } else {
+        return u32(syscall0(SYS_getegid));
+    }
 }
 
 pub fn seteuid(euid: u32) usize {
@@ -526,27 +558,51 @@ pub fn setegid(egid: u32) usize {
 }
 
 pub fn getresuid(ruid: *u32, euid: *u32, suid: *u32) usize {
-    return syscall3(SYS_getresuid, @ptrToInt(ruid), @ptrToInt(euid), @ptrToInt(suid));
+    if (@hasDecl(@This(), "SYS_getresuid32")) {
+        return syscall3(SYS_getresuid32, @ptrToInt(ruid), @ptrToInt(euid), @ptrToInt(suid));
+    } else {
+        return syscall3(SYS_getresuid, @ptrToInt(ruid), @ptrToInt(euid), @ptrToInt(suid));
+    }
 }
 
 pub fn getresgid(rgid: *u32, egid: *u32, sgid: *u32) usize {
-    return syscall3(SYS_getresgid, @ptrToInt(rgid), @ptrToInt(egid), @ptrToInt(sgid));
+    if (@hasDecl(@This(), "SYS_getresgid32")) {
+        return syscall3(SYS_getresgid32, @ptrToInt(rgid), @ptrToInt(egid), @ptrToInt(sgid));
+    } else {
+        return syscall3(SYS_getresgid, @ptrToInt(rgid), @ptrToInt(egid), @ptrToInt(sgid));
+    }
 }
 
 pub fn setresuid(ruid: u32, euid: u32, suid: u32) usize {
-    return syscall3(SYS_setresuid, ruid, euid, suid);
+    if (@hasDecl(@This(), "SYS_setresuid32")) {
+        return syscall3(SYS_setresuid32, ruid, euid, suid);
+    } else {
+        return syscall3(SYS_setresuid, ruid, euid, suid);
+    }
 }
 
 pub fn setresgid(rgid: u32, egid: u32, sgid: u32) usize {
-    return syscall3(SYS_setresgid, rgid, egid, sgid);
+    if (@hasDecl(@This(), "SYS_setresgid32")) {
+        return syscall3(SYS_setresgid32, rgid, egid, sgid);
+    } else {
+        return syscall3(SYS_setresgid, rgid, egid, sgid);
+    }
 }
 
 pub fn getgroups(size: usize, list: *u32) usize {
-    return syscall2(SYS_getgroups, size, @ptrToInt(list));
+    if (@hasDecl(@This(), "SYS_getgroups32")) {
+        return syscall2(SYS_getgroups32, size, @ptrToInt(list));
+    } else {
+        return syscall2(SYS_getgroups, size, @ptrToInt(list));
+    }
 }
 
 pub fn setgroups(size: usize, list: *const u32) usize {
-    return syscall2(SYS_setgroups, size, @ptrToInt(list));
+    if (@hasDecl(@This(), "SYS_setgroups32")) {
+        return syscall2(SYS_setgroups32, size, @ptrToInt(list));
+    } else {
+        return syscall2(SYS_setgroups, size, @ptrToInt(list));
+    }
 }
 
 pub fn getpid() i32 {

From e9d795b025e55dcd9d8c4378141b996358634863 Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Sun, 1 Sep 2019 12:08:02 +0200
Subject: [PATCH 12/16] Fix up seteuid and setegid

---
 std/os/linux.zig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/std/os/linux.zig b/std/os/linux.zig
index e24ba441cc..7bb59dde41 100644
--- a/std/os/linux.zig
+++ b/std/os/linux.zig
@@ -550,11 +550,11 @@ pub fn getegid() u32 {
 }
 
 pub fn seteuid(euid: u32) usize {
-    return syscall1(SYS_seteuid, euid);
+    return setreuid(std.math.maxInt(u32), euid);
 }
 
 pub fn setegid(egid: u32) usize {
-    return syscall1(SYS_setegid, egid);
+    return setregid(std.math.maxInt(u32), egid);
 }
 
 pub fn getresuid(ruid: *u32, euid: *u32, suid: *u32) usize {

From e7912dee9bd63b03415f441b4de9b3babc79c859 Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Sun, 1 Sep 2019 16:10:36 +0200
Subject: [PATCH 13/16] Fix up preadv, preadv2, pwritev and pwritev2

---
 std/os/linux.zig | 42 ++++++++++++++++++++++++++++++++++++------
 1 file changed, 36 insertions(+), 6 deletions(-)

diff --git a/std/os/linux.zig b/std/os/linux.zig
index 7bb59dde41..58c402f829 100644
--- a/std/os/linux.zig
+++ b/std/os/linux.zig
@@ -210,11 +210,26 @@ pub fn read(fd: i32, buf: [*]u8, count: usize) usize {
 }
 
 pub fn preadv(fd: i32, iov: [*]const iovec, count: usize, offset: u64) usize {
-    return syscall4(SYS_preadv, @bitCast(usize, isize(fd)), @ptrToInt(iov), count, offset);
+    return syscall5(
+        SYS_preadv,
+        @bitCast(usize, isize(fd)),
+        @ptrToInt(iov),
+        count,
+        @truncate(usize, offset),
+        @truncate(usize, offset >> 32),
+    );
 }
 
 pub fn preadv2(fd: i32, iov: [*]const iovec, count: usize, offset: u64, flags: kernel_rwf) usize {
-    return syscall5(SYS_preadv2, @bitCast(usize, isize(fd)), @ptrToInt(iov), count, offset, flags);
+    return syscall6(
+        SYS_preadv2,
+        @bitCast(usize, isize(fd)),
+        @ptrToInt(iov),
+        count,
+        @truncate(usize, offset),
+        @truncate(usize, offset >> 32),
+        flags
+    );
 }
 
 pub fn readv(fd: i32, iov: [*]const iovec, count: usize) usize {
@@ -226,11 +241,26 @@ pub fn writev(fd: i32, iov: [*]const iovec_const, count: usize) usize {
 }
 
 pub fn pwritev(fd: i32, iov: [*]const iovec_const, count: usize, offset: u64) usize {
-    return syscall4(SYS_pwritev, @bitCast(usize, isize(fd)), @ptrToInt(iov), count, offset);
+    return syscall5(
+        SYS_pwritev,
+        @bitCast(usize, isize(fd)),
+        @ptrToInt(iov),
+        count,
+        @truncate(usize, offset),
+        @truncate(usize, offset >> 32),
+    );
 }
 
 pub fn pwritev2(fd: i32, iov: [*]const iovec_const, count: usize, offset: u64, flags: kernel_rwf) usize {
-    return syscall5(SYS_pwritev2, @bitCast(usize, isize(fd)), @ptrToInt(iov), count, offset, flags);
+    return syscall6(
+        SYS_pwritev2,
+        @bitCast(usize, isize(fd)),
+        @ptrToInt(iov),
+        count,
+        @truncate(usize, offset),
+        @truncate(usize, offset >> 32),
+        flags
+    );
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
@@ -503,9 +533,9 @@ pub fn setgid(gid: u32) usize {
 
 pub fn setreuid(ruid: u32, euid: u32) usize {
     if (@hasDecl(@This(), "SYS_setreuid32")) {
-        return syscall2(SYS_setreuid32, ruid, euid));
+        return syscall2(SYS_setreuid32, ruid, euid);
     } else {
-        return syscall2(SYS_setreuid, ruid, euid));
+        return syscall2(SYS_setreuid, ruid, euid);
     }
 }
 

From 6a76298740344ba6d82c33b19914238a1233eaa0 Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Wed, 4 Sep 2019 15:59:51 +0200
Subject: [PATCH 14/16] Add missing clobbers on arm-eabi and arm64 syscall
 conventions

---
 std/os/linux/arm-eabi.zig | 7 +++++++
 std/os/linux/arm64.zig    | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/std/os/linux/arm-eabi.zig b/std/os/linux/arm-eabi.zig
index 1167c10f0b..a0a00dce8b 100644
--- a/std/os/linux/arm-eabi.zig
+++ b/std/os/linux/arm-eabi.zig
@@ -2,6 +2,7 @@ pub fn syscall0(number: usize) usize {
     return asm volatile ("svc #0"
         : [ret] "={r0}" (-> usize)
         : [number] "{r7}" (number)
+        : "memory"
     );
 }
 
@@ -10,6 +11,7 @@ pub fn syscall1(number: usize, arg1: usize) usize {
         : [ret] "={r0}" (-> usize)
         : [number] "{r7}" (number),
           [arg1] "{r0}" (arg1)
+        : "memory"
     );
 }
 
@@ -19,6 +21,7 @@ pub fn syscall2(number: usize, arg1: usize, arg2: usize) usize {
         : [number] "{r7}" (number),
           [arg1] "{r0}" (arg1),
           [arg2] "{r1}" (arg2)
+        : "memory"
     );
 }
 
@@ -29,6 +32,7 @@ pub fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) usize {
           [arg1] "{r0}" (arg1),
           [arg2] "{r1}" (arg2),
           [arg3] "{r2}" (arg3)
+        : "memory"
     );
 }
 
@@ -40,6 +44,7 @@ pub fn syscall4(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usiz
           [arg2] "{r1}" (arg2),
           [arg3] "{r2}" (arg3),
           [arg4] "{r3}" (arg4)
+        : "memory"
     );
 }
 
@@ -52,6 +57,7 @@ pub fn syscall5(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usiz
           [arg3] "{r2}" (arg3),
           [arg4] "{r3}" (arg4),
           [arg5] "{r4}" (arg5)
+        : "memory"
     );
 }
 
@@ -73,6 +79,7 @@ pub fn syscall6(
           [arg4] "{r3}" (arg4),
           [arg5] "{r4}" (arg5),
           [arg6] "{r5}" (arg6)
+        : "memory"
     );
 }
 
diff --git a/std/os/linux/arm64.zig b/std/os/linux/arm64.zig
index 94cf8818de..28da9af1c6 100644
--- a/std/os/linux/arm64.zig
+++ b/std/os/linux/arm64.zig
@@ -2,6 +2,7 @@ pub fn syscall0(number: usize) usize {
     return asm volatile ("svc #0"
         : [ret] "={x0}" (-> usize)
         : [number] "{x8}" (number)
+        : "memory", "cc"
     );
 }
 
@@ -10,6 +11,7 @@ pub fn syscall1(number: usize, arg1: usize) usize {
         : [ret] "={x0}" (-> usize)
         : [number] "{x8}" (number),
           [arg1] "{x0}" (arg1)
+        : "memory", "cc"
     );
 }
 
@@ -19,6 +21,7 @@ pub fn syscall2(number: usize, arg1: usize, arg2: usize) usize {
         : [number] "{x8}" (number),
           [arg1] "{x0}" (arg1),
           [arg2] "{x1}" (arg2)
+        : "memory", "cc"
     );
 }
 
@@ -29,6 +32,7 @@ pub fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) usize {
           [arg1] "{x0}" (arg1),
           [arg2] "{x1}" (arg2),
           [arg3] "{x2}" (arg3)
+        : "memory", "cc"
     );
 }
 
@@ -40,6 +44,7 @@ pub fn syscall4(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usiz
           [arg2] "{x1}" (arg2),
           [arg3] "{x2}" (arg3),
           [arg4] "{x3}" (arg4)
+        : "memory", "cc"
     );
 }
 
@@ -52,6 +57,7 @@ pub fn syscall5(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usiz
           [arg3] "{x2}" (arg3),
           [arg4] "{x3}" (arg4),
           [arg5] "{x4}" (arg5)
+        : "memory", "cc"
     );
 }
 
@@ -73,6 +79,7 @@ pub fn syscall6(
           [arg4] "{x3}" (arg4),
           [arg5] "{x4}" (arg5),
           [arg6] "{x5}" (arg6)
+        : "memory", "cc"
     );
 }
 

From 77d04c03e3f20c4c60d98e73b876222006aa05fc Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Wed, 4 Sep 2019 16:23:25 +0200
Subject: [PATCH 15/16] Implement remaining requested changes

- Replace @intCast with a checked version (std/debug.zig)
- Replace @intCast with i64() when casting from a smaller type (std/fs/file.zig)
- Replace `nakedcc` with appropriate calling convention for linking with c (std/os/linux/arm-eabi.zig)
- Only check if hwcap contains TLS when the hwcap field actually exists (std/os/linux/tls.zig)
---
 std/debug.zig             | 3 ++-
 std/fs/file.zig           | 6 +++---
 std/os/linux/arm-eabi.zig | 2 +-
 std/os/linux/tls.zig      | 6 +++---
 4 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/std/debug.zig b/std/debug.zig
index 8918426e47..68e6220a72 100644
--- a/std/debug.zig
+++ b/std/debug.zig
@@ -1053,7 +1053,8 @@ fn openSelfDebugInfoPosix(allocator: *mem.Allocator) !DwarfInfo {
     S.self_exe_file = try fs.openSelfExe();
     errdefer S.self_exe_file.close();
 
-    const self_exe_mmap_len = mem.alignForward(@intCast(usize, try S.self_exe_file.getEndPos()), mem.page_size);
+    const self_exe_len = math.cast(usize, try S.self_exe_file.getEndPos()) catch return error.DebugInfoTooLarge;
+    const self_exe_mmap_len = mem.alignForward(self_exe_len, mem.page_size);
     const self_exe_mmap = try os.mmap(
         null,
         self_exe_mmap_len,
diff --git a/std/fs/file.zig b/std/fs/file.zig
index 83cbe23780..5ecad01026 100644
--- a/std/fs/file.zig
+++ b/std/fs/file.zig
@@ -261,9 +261,9 @@ pub const File = struct {
         return Stat{
             .size = @bitCast(u64, st.size),
             .mode = st.mode,
-            .atime = @intCast(i64, atime.tv_sec) * std.time.ns_per_s + atime.tv_nsec,
-            .mtime = @intCast(i64, mtime.tv_sec) * std.time.ns_per_s + mtime.tv_nsec,
-            .ctime = @intCast(i64, ctime.tv_sec) * std.time.ns_per_s + ctime.tv_nsec,
+            .atime = i64(atime.tv_sec) * std.time.ns_per_s + atime.tv_nsec,
+            .mtime = i64(mtime.tv_sec) * std.time.ns_per_s + mtime.tv_nsec,
+            .ctime = i64(ctime.tv_sec) * std.time.ns_per_s + ctime.tv_nsec,
         };
     }
 
diff --git a/std/os/linux/arm-eabi.zig b/std/os/linux/arm-eabi.zig
index a0a00dce8b..c8a5bbe378 100644
--- a/std/os/linux/arm-eabi.zig
+++ b/std/os/linux/arm-eabi.zig
@@ -89,7 +89,7 @@ pub extern fn clone(func: extern fn (arg: usize) u8, stack: usize, flags: u32, a
 // LLVM calls this when the read-tp-hard feature is set to false. Currently, there is no way to pass
 // that to llvm via zig, see https://github.com/ziglang/zig/issues/2883.
 // LLVM expects libc to provide this function as __aeabi_read_tp, so it is exported if needed from special/c.zig.
-pub nakedcc fn getThreadPointer() usize {
+pub extern fn getThreadPointer() usize {
     return asm volatile("mrc p15, 0, %[ret], c13, c0, 3"
         : [ret] "=r" (-> usize)
     );
diff --git a/std/os/linux/tls.zig b/std/os/linux/tls.zig
index 8920e28a5b..2ed5f1d75b 100644
--- a/std/os/linux/tls.zig
+++ b/std/os/linux/tls.zig
@@ -133,7 +133,7 @@ pub fn initTLS() void {
     var at_phent: usize = undefined;
     var at_phnum: usize = undefined;
     var at_phdr: usize = undefined;
-    var at_hwcap: usize = undefined;
+    var at_hwcap: ?usize = null;
 
     var i: usize = 0;
     while (auxv[i].a_type != std.elf.AT_NULL) : (i += 1) {
@@ -147,8 +147,8 @@ pub fn initTLS() void {
     }
 
     // If the cpu is arm-based, check if it supports the TLS register
-    if (builtin.arch == builtin.Arch.arm) {
-        if (at_hwcap & std.os.linux.HWCAP_TLS == 0) {
+    if (at_hwcap) |hwcap| {
+        if (builtin.arch == builtin.Arch.arm and hwcap & std.os.linux.HWCAP_TLS == 0) {
             // If the CPU does not support TLS via a coprocessor register,
             // a kernel helper function can be used instead on certain linux kernels.
             // See linux/arch/arm/include/asm/tls.h and musl/src/thread/arm/__set_thread_area.c.

From df06976e73e37a36009fb5f43c2310ad610a4a2e Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Wed, 4 Sep 2019 17:48:01 +0200
Subject: [PATCH 16/16] Only check for TLS support on arm if TLS segment exists

---
 std/os/linux/tls.zig | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/std/os/linux/tls.zig b/std/os/linux/tls.zig
index 2ed5f1d75b..3c55013f47 100644
--- a/std/os/linux/tls.zig
+++ b/std/os/linux/tls.zig
@@ -133,7 +133,7 @@ pub fn initTLS() void {
     var at_phent: usize = undefined;
     var at_phnum: usize = undefined;
     var at_phdr: usize = undefined;
-    var at_hwcap: ?usize = null;
+    var at_hwcap: usize = undefined;
 
     var i: usize = 0;
     while (auxv[i].a_type != std.elf.AT_NULL) : (i += 1) {
@@ -146,16 +146,6 @@ pub fn initTLS() void {
         }
     }
 
-    // If the cpu is arm-based, check if it supports the TLS register
-    if (at_hwcap) |hwcap| {
-        if (builtin.arch == builtin.Arch.arm and hwcap & std.os.linux.HWCAP_TLS == 0) {
-            // If the CPU does not support TLS via a coprocessor register,
-            // a kernel helper function can be used instead on certain linux kernels.
-            // See linux/arch/arm/include/asm/tls.h and musl/src/thread/arm/__set_thread_area.c.
-            @panic("TODO: Implement ARM fallback TLS functionality");
-        }
-    }
-
     // Sanity check
     assert(at_phent == @sizeOf(elf.Phdr));
 
@@ -171,6 +161,14 @@ pub fn initTLS() void {
     }
 
     if (tls_phdr) |phdr| {
+        // If the cpu is arm-based, check if it supports the TLS register
+        if (builtin.arch == builtin.Arch.arm and hwcap & std.os.linux.HWCAP_TLS == 0) {
+            // If the CPU does not support TLS via a coprocessor register,
+            // a kernel helper function can be used instead on certain linux kernels.
+            // See linux/arch/arm/include/asm/tls.h and musl/src/thread/arm/__set_thread_area.c.
+            @panic("TODO: Implement ARM fallback TLS functionality");
+        }
+
         // Offsets into the allocated TLS area
         var tcb_offset: usize = undefined;
         var dtv_offset: usize = undefined;