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39bf41f4eb
- Python static hello world now 1.8mb
- Python static fully loaded now 10mb
- Python HTTPS client now uses MbedTLS
- Python REPL now completes import stmts
- Increase stack size for Python for now
- Begin synthesizing posixpath and ntpath
- Restore Python \N{UNICODE NAME} support
- Restore Python NFKD symbol normalization
- Add optimized code path for Intel SHA-NI
- Get more Python unit tests passing faster
- Get Python help() pagination working on NT
- Python hashlib now supports MbedTLS PBKDF2
- Make memcpy/memmove/memcmp/bcmp/etc. faster
- Add Mersenne Twister and Vigna to LIBC_RAND
- Provide privileged __printf() for error code
- Fix zipos opendir() so that it reports ENOTDIR
- Add basic chmod() implementation for Windows NT
- Add Cosmo's best functions to Python cosmo module
- Pin function trace indent depth to that of caller
- Show memory diagram on invalid access in MODE=dbg
- Differentiate stack overflow on crash in MODE=dbg
- Add stb_truetype and tools for analyzing font files
- Upgrade to UNICODE 13 and reduce its binary footprint
- COMPILE.COM now logs resource usage of build commands
- Start implementing basic poll() support on bare metal
- Set getauxval(AT_EXECFN) to GetModuleFileName() on NT
- Add descriptions to strerror() in non-TINY build modes
- Add COUNTBRANCH() macro to help with micro-optimizations
- Make error / backtrace / asan / memory code more unbreakable
- Add fast perfect C implementation of μ-Law and a-Law audio codecs
- Make strtol() functions consistent with other libc implementations
- Improve Linenoise implementation (see also github.com/jart/bestline)
- COMPILE.COM now suppresses stdout/stderr of successful build commands
74 lines
3.3 KiB
C
74 lines
3.3 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=8 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/bits/xadd.h"
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#include "libc/calls/calls.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/rand/rand.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/auxv.h"
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static uint64_t thepool;
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/**
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* Returns nondeterministic random data.
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*
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* This function automatically seeds itself on startup and reseeds
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* itself after fork() and vfork(). It takes about nanosecond to run.
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* That makes it much slower than vigna() and rand() but much faster
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* than rdrand() and rdseed().
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*
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* @see rdseed(), rdrand(), rand(), random(), rngset()
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* @note based on vigna's algorithm
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* @asyncsignalsafe
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* @vforksafe
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*/
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uint64_t rand64(void) {
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bool cf;
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register uint64_t t;
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if (X86_HAVE(RDSEED)) {
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asm volatile(CFLAG_ASM("rdseed\t%1")
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: CFLAG_CONSTRAINT(cf), "=r"(t)
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: /* no inputs */
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: "cc");
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if (cf) {
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thepool ^= t;
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return t;
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}
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}
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t = _xadd(&thepool, 0x9e3779b97f4a7c15);
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t ^= (getpid() * 0x1001111111110001ull + 0xdeaadead) >> 31;
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t = (t ^ (t >> 30)) * 0xbf58476d1ce4e5b9;
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t = (t ^ (t >> 27)) * 0x94d049bb133111eb;
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return t ^ (t >> 31);
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}
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static textstartup void rand64_init(int argc, char **argv, char **envp,
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intptr_t *auxv) {
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for (; auxv[0]; auxv += 2) {
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if (auxv[0] == AT_RANDOM) {
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thepool = READ64LE((const char *)auxv[1]);
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return;
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}
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}
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thepool = kStartTsc;
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}
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const void *const g_rand64_init[] initarray = {rand64_init};
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