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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
77 lines
3.3 KiB
C
77 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=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/errno.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/sysv/consts/grnd.h"
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STATIC_YOINK("rdrand_init");
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static noinline uint64_t rdrand_failover(void) {
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int f;
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size_t i;
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ssize_t r;
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volatile uint64_t b;
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register uint64_t x;
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for (f = GRND_RANDOM | GRND_NONBLOCK, i = 0; i < 8; i += r) {
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if ((r = getrandom((char *)&b + i, 8 - i, f)) <= 0) {
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if (r == -1 && errno == EINTR) {
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r = 0;
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} else if (r == -1 && errno == EAGAIN) {
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f = 0;
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} else {
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return rand64();
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}
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}
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}
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x = b;
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b = 0;
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return x;
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}
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/**
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* Retrieves 64-bits of hardware random data from RDRAND instruction.
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*
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* If RDRAND isn't available (we check CPUID and we also disable it
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* automatically for microarchitectures where it's slow or buggy) then
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* we try getrandom(), RtlGenRandom(), or sysctl(KERN_ARND). If those
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* aren't available then we try /dev/urandom and if that fails, we try
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* getauxval(AT_RANDOM), and if not we finally use RDTSC and getpid().
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*
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* This function takes between 10 nanoseconds to several microseconds.
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*
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* @see rngset(), rdseed(), rand64()
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*/
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uint64_t rdrand(void) {
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int i;
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char cf;
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uint64_t x;
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if (X86_HAVE(RDRND)) {
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for (i = 0; i < 10; ++i) {
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asm volatile(CFLAG_ASM("rdrand\t%1")
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: CFLAG_CONSTRAINT(cf), "=r"(x)
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: /* no inputs */
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: "cc");
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if (cf) return x;
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asm volatile("pause");
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}
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}
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return rdrand_failover();
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}
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