48 lines
2.6 KiB
C
48 lines
2.6 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/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 uint32_t g_rando32;
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textstartup static void g_rando32_init() {
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intptr_t *auxvp;
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if (!IsXnu() && !IsWindows()) {
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asm("mov\t%%r15,%0" : "=r"(auxvp)); /* libc/crt/crt.S */
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for (; *auxvp; auxvp += 2) {
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if (*auxvp == AT_RANDOM) {
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uint8_t(*sysrandseed)[16] = (uint8_t(*)[16])auxvp[1];
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if (sysrandseed) g_rando32 ^= read32le(&(*sysrandseed)[8]);
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return;
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}
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}
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}
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g_rando32 ^= kMarsagliaXorshift32Seed;
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if (IsWindows()) {
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g_rando32 ^= winrandish();
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} else {
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devrand(&g_rando32, sizeof(g_rando32));
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}
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}
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const void *const g_rando32_ctor[] initarray = {g_rando32_init};
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