mirror of
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
119 lines
4.2 KiB
C
119 lines
4.2 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/calls/clock_gettime.internal.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/syscall_support-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/bits.h"
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#include "libc/intrin/safemacros.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/rdtsc.h"
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#include "libc/nexgen32e/x86feature.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/thread/tls.h"
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#include "libc/time/time.h"
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// TODO(jart): DELETE
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static clock_gettime_f *__gettime;
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static struct Now {
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uint64_t k0;
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long double r0, cpn;
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} g_now;
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static long double GetTimeSample(void) {
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uint64_t tick1, tick2;
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long double time1, time2;
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sched_yield();
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time1 = dtime(CLOCK_REALTIME_PRECISE);
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tick1 = rdtsc();
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nanosleep(&(struct timespec){0, 1000000}, NULL);
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time2 = dtime(CLOCK_REALTIME_PRECISE);
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tick2 = rdtsc();
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return (time2 - time1) * 1e9 / MAX(1, tick2 - tick1);
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}
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static long double MeasureNanosPerCycle(void) {
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int i, n;
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long double avg, samp;
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if (__tls_enabled) __get_tls()->tib_flags |= TIB_FLAG_TIME_CRITICAL;
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if (IsWindows()) {
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n = 10;
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} else {
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n = 5;
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}
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for (avg = 1.0L, i = 1; i < n; ++i) {
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samp = GetTimeSample();
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avg += (samp - avg) / i;
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}
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if (__tls_enabled) __get_tls()->tib_flags &= ~TIB_FLAG_TIME_CRITICAL;
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STRACE("MeasureNanosPerCycle cpn*1000=%d", (long)(avg * 1000));
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return avg;
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}
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void RefreshTime(void) {
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struct Now now;
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now.cpn = MeasureNanosPerCycle();
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now.r0 = dtime(CLOCK_REALTIME_PRECISE);
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now.k0 = rdtsc();
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memcpy(&g_now, &now, sizeof(now));
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}
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static long double nowl_sys(void) {
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return dtime(CLOCK_REALTIME_PRECISE);
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}
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static long double nowl_art(void) {
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uint64_t ticks = rdtsc() - g_now.k0;
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return g_now.r0 + (1 / 1e9L * (ticks * g_now.cpn));
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}
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static long double nowl_vdso(void) {
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long double secs;
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struct timespec tv;
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unassert(__gettime);
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__gettime(CLOCK_REALTIME_PRECISE, &tv);
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secs = tv.tv_nsec;
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secs *= 1 / 1e9L;
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secs += tv.tv_sec;
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return secs;
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}
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long double nowl_setup(void) {
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bool isfast;
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uint64_t ticks;
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__gettime = __clock_gettime_get(&isfast);
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if (isfast) {
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nowl = nowl_vdso;
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} else if (X86_HAVE(INVTSC)) {
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RefreshTime();
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nowl = nowl_art;
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} else {
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nowl = nowl_sys;
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}
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return nowl();
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}
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long double (*nowl)(void) = nowl_setup;
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