/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│ │vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│ ╞══════════════════════════════════════════════════════════════════════════════╡ │ Copyright 2021 Justine Alexandra Roberts Tunney │ │ │ │ Permission to use, copy, modify, and/or distribute this software for │ │ any purpose with or without fee is hereby granted, provided that the │ │ above copyright notice and this permission notice appear in all copies. │ │ │ │ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │ │ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │ │ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │ │ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │ │ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │ │ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │ │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │ │ PERFORMANCE OF THIS SOFTWARE. │ ╚─────────────────────────────────────────────────────────────────────────────*/ #include "libc/calls/calls.h" #include "libc/dce.h" #include "libc/errno.h" #include "libc/intrin/kprintf.h" #include "libc/intrin/spinlock.h" #include "libc/intrin/wait0.internal.h" #include "libc/log/backtrace.internal.h" #include "libc/mem/mem.h" #include "libc/nexgen32e/gettls.h" #include "libc/nexgen32e/nexgen32e.h" #include "libc/runtime/runtime.h" #include "libc/runtime/stack.h" #include "libc/runtime/symbols.internal.h" #include "libc/sysv/consts/clone.h" #include "libc/sysv/consts/map.h" #include "libc/sysv/consts/o.h" #include "libc/sysv/consts/prot.h" #include "libc/sysv/consts/sig.h" #include "libc/testlib/ezbench.h" #include "libc/testlib/testlib.h" #include "libc/time/time.h" char *stack, *tls; int x, me, tid, *childetid; _Atomic(int) thechilde; void SetUp(void) { x = 0; me = gettid(); tls = calloc(1, 64); __initialize_tls(tls); *(int *)(tls + 0x3c) = 31337; childetid = (int *)(tls + 0x38); ASSERT_NE(MAP_FAILED, (stack = mmap(0, GetStackSize(), PROT_READ | PROT_WRITE, MAP_STACK | MAP_ANONYMOUS, -1, 0))); } void TearDown(void) { EXPECT_SYS(0, 0, munmap(stack, GetStackSize())); free(tls); } int DoNothing(void *arg) { return 0; } //////////////////////////////////////////////////////////////////////////////// // TEST ERROR NUMBERS TEST(clone, testNullFunc_raisesEinval) { EXPECT_SYS(EINVAL, -1, clone(0, stack, GetStackSize(), CLONE_THREAD | CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_SETTLS, 0, 0, tls, 64, 0)); } //////////////////////////////////////////////////////////////////////////////// // TEST THREADS WORK int CloneTest1(void *arg) { intptr_t rsp, top, bot; CheckStackIsAligned(); // PrintBacktraceUsingSymbols(2, __builtin_frame_address(0), // GetSymbolTable()); rsp = (intptr_t)__builtin_frame_address(0); bot = (intptr_t)stack; top = bot + GetStackSize(); ASSERT_GT(rsp, bot); // check we're on stack ASSERT_LT(rsp, top); // check we're on stack ASSERT_GT(rsp, top - 256); // check we're near top of stack ASSERT_TRUE(IS2POW(GetStackSize())); ASSERT_EQ(0, bot & (GetStackSize() - 1)); x = 42; if (!IsWindows()) { ASSERT_EQ(31337, errno); } else { errno = 31337; ASSERT_EQ(31337, errno); } ASSERT_EQ(23, (intptr_t)arg); ASSERT_NE(gettid(), getpid()); ASSERT_EQ(gettid(), *childetid); // CLONE_CHILD_SETTID return 0; } TEST(clone, test1) { int ptid = 0; *childetid = -1; ASSERT_NE(-1, (tid = clone(CloneTest1, stack, GetStackSize(), CLONE_THREAD | CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_PARENT_SETTID | CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID | CLONE_SETTLS, (void *)23, &ptid, tls, 64, childetid))); _wait0(childetid); // CLONE_CHILD_CLEARTID ASSERT_NE(gettid(), tid); ASSERT_EQ(tid, ptid); ASSERT_EQ(42, x); ASSERT_NE(me, tid); ASSERT_EQ(0, errno); errno = 31337; ASSERT_EQ(31337, errno); errno = 0; } //////////////////////////////////////////////////////////////////////////////// // TEST THREADS CAN ISSUE SYSTEM CALLS WITH INDEPENDENT ERRNOS _Atomic(int) sysbarrier; int CloneTestSys(void *arg) { int i, id = (intptr_t)arg; CheckStackIsAligned(); while (!sysbarrier) asm("pause"); for (i = 0; i < 20; ++i) { switch (id % 3) { case 0: errno = 123; open(0, 0); asm("pause"); ASSERT_EQ(EFAULT, errno); break; case 1: errno = 123; dup(-1); asm("pause"); ASSERT_EQ(EBADF, errno); break; case 2: errno = 123; dup3(0, 0, 0); asm("pause"); ASSERT_EQ(EINVAL, errno); break; default: unreachable; } } return 0; } TEST(clone, tlsSystemCallsErrno_wontClobberMainThreadBecauseTls) { int i; char *tls[8], *stack[8]; ASSERT_EQ(0, errno); for (i = 0; i < 8; ++i) { tls[i] = __initialize_tls(malloc(64)); stack[i] = mmap(0, GetStackSize(), PROT_READ | PROT_WRITE, MAP_STACK | MAP_ANONYMOUS, -1, 0); ASSERT_NE( -1, (tid = clone( CloneTestSys, stack[i], GetStackSize(), CLONE_THREAD | CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID | CLONE_SETTLS, (void *)(intptr_t)i, 0, tls[i], 64, (int *)(tls[i] + 0x38)))); } sysbarrier = 1; for (i = 0; i < 8; ++i) { _wait0((int *)(tls[i] + 0x38)); free(tls[i]); munmap(stack[i], GetStackSize()); } ASSERT_EQ(0, errno); } //////////////////////////////////////////////////////////////////////////////// // BENCHMARK void LaunchThread(void) { char *tls, *stack; tls = __initialize_tls(malloc(64)); __cxa_atexit(free, tls, 0); stack = mmap(0, GetStackSize(), PROT_READ | PROT_WRITE, MAP_STACK | MAP_ANONYMOUS, -1, 0); clone(DoNothing, stack, GetStackSize(), CLONE_THREAD | CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID | CLONE_SETTLS, 0, 0, tls, 64, (int *)(tls + 0x38)); } BENCH(clone, bench) { char *volatile tp; errno_t *volatile ep; EZBENCH2("__errno_location", donothing, (ep = __errno_location())); EZBENCH2("__get_tls_inline", donothing, (tp = __get_tls_inline())); EZBENCH2("__get_tls", donothing, (tp = __get_tls())); EZBENCH2("clone()", donothing, LaunchThread()); }