mirror of
https://github.com/jart/cosmopolitan.git
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68 lines
3.3 KiB
C
68 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/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/errno.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/threaded.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/stack.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/prot.h"
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#include "libc/thread/thread.h"
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textstartup void _main_thread_init(void) {
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_Static_assert(offsetof(struct cthread_descriptor_t, self) == 0x00, "");
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_Static_assert(offsetof(struct cthread_descriptor_t, self2) == 0x30, "");
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_Static_assert(offsetof(struct cthread_descriptor_t, tid) == 0x38, "");
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_Static_assert(offsetof(struct cthread_descriptor_t, err) == 0x3c, "");
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cthread_t td;
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size_t totalsize;
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char *mem, *bottom, *top;
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totalsize = ROUNDUP(
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(uintptr_t)_tls_size + sizeof(struct cthread_descriptor_t), FRAMESIZE);
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mem = mmap(0, totalsize, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE,
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-1, 0);
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assert(mem != MAP_FAILED);
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bottom = mem;
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top = mem + totalsize;
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td = (cthread_t)(top - sizeof(struct cthread_descriptor_t));
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td->self = td;
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td->self2 = td;
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td->err = errno;
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td->tid = gettid();
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td->alloc.bottom = bottom;
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td->alloc.top = top;
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td->stack.bottom = GetStackAddr(0);
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td->stack.top = td->stack.bottom + GetStackSize();
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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 - (uintptr_t)_tls_size), _tdata_start,
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(uintptr_t)_tdata_size);
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// Set FS
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__install_tls((char *)td);
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}
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