49 lines
2.7 KiB
C
49 lines
2.7 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/bits.h"
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#include "libc/dce.h"
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#include "libc/rand/rand.h"
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#include "libc/rand/xorshift.h"
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#include "libc/sysv/consts/auxv.h"
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hidden uint64_t g_rando64;
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textstartup static void g_rando64_init() {
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register intptr_t *auxv asm("r15"); /* @see libc/crt/crt.S */
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asm volatile("" : "=r"(auxv));
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if (!IsXnu() && !IsWindows()) {
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for (intptr_t *auxvp = auxv; auxvp[0]; auxvp += 2) {
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if (auxvp[0] == AT_RANDOM) {
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uint8_t(*sysrandseed)[16] = (uint8_t(*)[16])auxvp[1];
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if (sysrandseed) g_rando64 ^= read64le(&(*sysrandseed)[0]);
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return;
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}
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}
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}
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g_rando64 ^= kMarsagliaXorshift64Seed;
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if (IsWindows()) {
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g_rando64 ^= winrandish();
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} else {
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devrand(&g_rando64, sizeof(g_rando64));
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}
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}
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const void *const g_rando64_ctor[] initarray = {g_rando64_init};
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