| author |  Robin Voetter <robin@voetter.nl> 2019-08-29 18:12:58+02:00 |
| committer | Robin Voetter <robin@voetter.nl> 2019-08-29 18:12:58+02:00 |
| log | 2323da3a680f48207d35db26f63ea0553e74d956 |
| tree | 4670d28b0cae89d11d18e66a68a2fc30a1ed85db |
| parent | e4c262b804dded7e47aea0bb61f4578b94a7fa86 |
add __aeabi_read_tp
4 files changed, 46 insertions(+), 0 deletions(-)
std- os
- bits
- linux
- linux
- special
std/os/bits/linux/arm-eabi.zig+24
| ... | ... | @@ -474,6 +474,30 @@ pub const VDSO_USEFUL = true; |
| 474 | 474 | pub const VDSO_CGT_SYM = "__vdso_clock_gettime"; |
| 475 | 475 | pub const VDSO_CGT_VER = "LINUX_2.6"; |
| 476 | 476 | |
| 477 | pub const HWCAP_SWP = 1 << 0; | |
| 478 | pub const HWCAP_HALF = 1 << 1; | |
| 479 | pub const HWCAP_THUMB = 1 << 2; | |
| 480 | pub const HWCAP_26BIT = 1 << 3; | |
| 481 | pub const HWCAP_FAST_MULT = 1 << 4; | |
| 482 | pub const HWCAP_FPA = 1 << 5; | |
| 483 | pub const HWCAP_VFP = 1 << 6; | |
| 484 | pub const HWCAP_EDSP = 1 << 7; | |
| 485 | pub const HWCAP_JAVA = 1 << 8; | |
| 486 | pub const HWCAP_IWMMXT = 1 << 9; | |
| 487 | pub const HWCAP_CRUNCH = 1 << 10; | |
| 488 | pub const HWCAP_THUMBEE = 1 << 11; | |
| 489 | pub const HWCAP_NEON = 1 << 12; | |
| 490 | pub const HWCAP_VFPv3 = 1 << 13; | |
| 491 | pub const HWCAP_VFPv3D16 = 1 << 14; | |
| 492 | pub const HWCAP_TLS = 1 << 15; | |
| 493 | pub const HWCAP_VFPv4 = 1 << 16; | |
| 494 | pub const HWCAP_IDIVA = 1 << 17; | |
| 495 | pub const HWCAP_IDIVT = 1 << 18; | |
| 496 | pub const HWCAP_VFPD32 = 1 << 19; | |
| 497 | pub const HWCAP_IDIV = HWCAP_IDIVA | HWCAP_IDIVT; | |
| 498 | pub const HWCAP_LPAE = 1 << 20; | |
| 499 | pub const HWCAP_EVTSTRM = 1 << 21; | |
| 500 | ||
| 477 | 501 | pub const msghdr = extern struct { |
| 478 | 502 | msg_name: ?*sockaddr, |
| 479 | 503 | msg_namelen: socklen_t, |
std/os/linux/arm-eabi.zig+8
| ... | ... | @@ -78,3 +78,11 @@ pub fn syscall6( |
| 78 | 78 | |
| 79 | 79 | /// This matches the libc clone function. |
| 80 | 80 | pub extern fn clone(func: extern fn (arg: usize) u8, stack: usize, flags: u32, arg: usize, ptid: *i32, tls: usize, ctid: *i32) usize; |
| 81 | ||
| 82 | // LLVM calls this when the read-tp-hard feature is set to false. Currently, there is no way to pass | |
| 83 | // that to llvm via zig. See https://github.com/ziglang/zig/issues/2883 | |
| 84 | pub nakedcc fn getThreadPointer() usize { | |
| 85 | return asm volatile("mrc p15, 0, %[ret], c13, c0, 3" | |
| 86 | : [ret] "=r" (-> usize) | |
| 87 | ); | |
| 88 | } | |
| \ No newline at end of file |
std/os/linux/tls.zig+12
| ... | ... | @@ -133,6 +133,7 @@ pub fn initTLS() void { |
| 133 | 133 | var at_phent: usize = undefined; |
| 134 | 134 | var at_phnum: usize = undefined; |
| 135 | 135 | var at_phdr: usize = undefined; |
| 136 | var at_hwcap: usize = undefined; | |
| 136 | 137 | |
| 137 | 138 | var i: usize = 0; |
| 138 | 139 | while (auxv[i].a_type != std.elf.AT_NULL) : (i += 1) { |
| ... | ... | @@ -140,10 +141,21 @@ pub fn initTLS() void { |
| 140 | 141 | elf.AT_PHENT => at_phent = auxv[i].a_un.a_val, |
| 141 | 142 | elf.AT_PHNUM => at_phnum = auxv[i].a_un.a_val, |
| 142 | 143 | elf.AT_PHDR => at_phdr = auxv[i].a_un.a_val, |
| 144 | elf.AT_HWCAP => at_phdr = auxv[i].a_un.a_val, | |
| 143 | 145 | else => continue, |
| 144 | 146 | } |
| 145 | 147 | } |
| 146 | 148 | |
| 149 | // If the cpu is arm-based, check if it supports the TLS register | |
| 150 | if (builtin.arch == builtin.Arch.arm and builtin.os == .linux) { | |
| 151 | if (at_hwcap & std.os.linux.HWCAP_TLS == 0) { | |
| 152 | // If the CPU does not support TLS via a coprocessor register, | |
| 153 | // it could be accessed via a kernel helper function | |
| 154 | // see musl/src/thread/arm/ for details | |
| 155 | @panic("cpu does not support TLS via coprocessor register"); | |
| 156 | } | |
| 157 | } | |
| 158 | ||
| 147 | 159 | // Sanity check |
| 148 | 160 | assert(at_phent == @sizeOf(elf.Phdr)); |
| 149 | 161 |
std/special/c.zig+2
| ... | ... | @@ -25,6 +25,8 @@ comptime { |
| 25 | 25 | @export("strncmp", strncmp, .Strong); |
| 26 | 26 | @export("strerror", strerror, .Strong); |
| 27 | 27 | @export("strlen", strlen, .Strong); |
| 28 | } else if (builtin.arch == builtin.Arch.arm and builtin.os == .linux) { | |
| 29 | @export("__aeabi_read_tp", std.os.linux.getThreadPointer, .Strong); | |
| 28 | 30 | } |
| 29 | 31 | } |
| 30 | 32 |