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https://github.com/jart/cosmopolitan.git
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91d783352a
Cosmopolitan Threads are currently Linux-only (with some NetBSD and Windows support too!). This change ensures we only initialize the high-level threading runtime when Cosmopolitan Threads are used.
74 lines
3.3 KiB
C
74 lines
3.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/dce.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/thread/descriptor.h"
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// TLS boundaries
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extern char _tbss_start, _tbss_end, _tdata_start, _tdata_end;
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static textstartup void _main_thread_init(void) {
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if (!IsLinux()) return; /* TODO */
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size_t tbsssize = &_tbss_end - &_tbss_start;
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size_t tdatasize = &_tdata_end - &_tdata_start;
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size_t tlssize = tbsssize + tdatasize;
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size_t totalsize = tlssize + sizeof(struct cthread_descriptor_t);
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totalsize = (totalsize + PAGESIZE - 1) & -PAGESIZE;
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uintptr_t mem = (uintptr_t)mmap(NULL, totalsize, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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if (mem == -1) {
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abort();
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}
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void* bottom = (void*)mem;
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void* top = (void*)(mem + totalsize);
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cthread_t td = (cthread_t)top - 1;
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td->self = td;
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td->stack.top = NULL;
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td->stack.bottom = NULL;
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td->tls.top = top;
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td->tls.bottom = bottom;
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td->alloc.top = top;
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td->alloc.bottom = bottom;
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td->state = cthread_main;
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// Initialize TLS with content of .tdata section
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memmove((void*)((uintptr_t)td - tlssize), &_tdata_start, tdatasize);
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// Get TID of main thread
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int gettid = __NR_gettid;
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if (gettid == 0xfff) gettid = __NR_getpid;
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td->tid = syscall(gettid);
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// Set FS
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if (arch_prctl(ARCH_SET_FS, td) != 0) {
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abort();
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}
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}
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const void* const _main_thread_ctor[] initarray = {
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_main_thread_init,
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};
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