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https://github.com/jart/cosmopolitan.git
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7e0a09feec
This change ports APE Loader to Linux AARCH64, so that Raspberry Pi users can run programs like redbean, without the executable needing to modify itself. Progress has also slipped into this change on the issue of making progress better conforming to user expectations and industry standards regarding which symbols we're allowed to declare
63 lines
3.1 KiB
C
63 lines
3.1 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 "ape/sections.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/thread/tls.h"
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extern int __threadcalls_end[] __attribute__((__weak__));
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extern int __threadcalls_start[] __attribute__((__weak__));
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static privileged void FixupLockNops(void) {
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__morph_begin();
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/*
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* _NOPL("__threadcalls", func)
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*
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* The big ugly macro above is used by Cosmopolitan Libc to unser
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* locking primitive (e.g. flockfile, funlockfile) have zero impact on
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* performance and binary size when threads aren't actually in play.
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*
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* we have this
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*
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* 0f 1f 05 b1 19 00 00 nopl func(%rip)
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*
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* we're going to turn it into this
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*
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* 67 67 e8 b1 19 00 00 addr32 addr32 call func
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*
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* This is cheap and fast because the big ugly macro stored in the
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* binary the offsets of all the instructions we need to change.
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*/
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for (int *p = __threadcalls_start; p < __threadcalls_end; ++p) {
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__executable_start[*p + 0] = 0x67;
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__executable_start[*p + 1] = 0x67;
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__executable_start[*p + 2] = 0xe8;
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}
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__morph_end();
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}
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void __enable_threads(void) {
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if (__threaded) return;
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#ifdef __x86_64__
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STRACE("__enable_threads()");
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FixupLockNops();
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#endif
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__threaded = __tls_enabled ? __get_tls()->tib_tid : sys_gettid();
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}
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