mirror of
https://github.com/jart/cosmopolitan.git
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1422e96b4e
There's a new program named ape/ape-m1.c which will be used to build an embeddable binary that can load ape and elf executables. The support is mostly working so far, but still chasing down ABI issues.
69 lines
3.4 KiB
C
69 lines
3.4 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 2022 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/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/nexgen32e/msr.internal.h"
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#include "libc/nt/thread.h"
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#include "libc/thread/tls.h"
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#include "libc/thread/tls2.h"
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int sys_set_tls();
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textstartup void __set_tls(struct CosmoTib *tib) {
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tib = __adj_tls(tib);
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#ifdef __x86_64__
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// ask the operating system to change the x86 segment register
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int ax, dx;
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if (IsWindows()) {
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__tls_index = TlsAlloc();
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_npassert(0 <= __tls_index && __tls_index < 64);
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asm("mov\t%1,%%gs:%0" : "=m"(*((long *)0x1480 + __tls_index)) : "r"(tib));
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} else if (IsFreebsd()) {
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sys_set_tls(129 /*AMD64_SET_FSBASE*/, tib);
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} else if (IsLinux()) {
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sys_set_tls(ARCH_SET_FS, tib);
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} else if (IsNetbsd()) {
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// netbsd has sysarch(X86_SET_FSBASE) but we can't use that because
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// signal handlers will cause it to be reset due to not setting the
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// _mc_tlsbase field in struct mcontext_netbsd.
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sys_set_tls(tib);
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} else if (IsOpenbsd()) {
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sys_set_tls(tib);
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} else if (IsXnu()) {
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// thread_fast_set_cthread_self has a weird ABI
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int e = errno;
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sys_set_tls((intptr_t)tib - 0x30);
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errno = e;
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} else {
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uint64_t val = (uint64_t)tib;
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asm volatile("wrmsr"
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: /* no outputs */
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: "c"(MSR_IA32_FS_BASE), "a"((uint32_t)val),
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"d"((uint32_t)(val >> 32)));
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}
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#else
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asm volatile("mov\tx28,%0" : /* no outputs */ : "r"(tib));
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if (!IsXnu()) {
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asm volatile("msr\ttpidr_el0,%0" : /* no outputs */ : "r"(tib));
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}
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#endif
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}
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