1#!/usr/bin/env perl 2 3# Copyright (c) 2015, Google Inc. 4# 5# Permission to use, copy, modify, and/or distribute this software for any 6# purpose with or without fee is hereby granted, provided that the above 7# copyright notice and this permission notice appear in all copies. 8# 9# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 12# SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 14# OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 15# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ 16 17use strict; 18 19my $flavour = shift; 20my $output = shift; 21if ($flavour =~ /\./) { $output = $flavour; undef $flavour; } 22 23my $win64 = 0; 24$win64 = 1 if ($flavour =~ /[nm]asm|mingw64/ || $output =~ /\.asm$/); 25 26$0 =~ m/(.*[\/\\])[^\/\\]+$/; 27my $dir = $1; 28my $xlate; 29( $xlate="${dir}../../../perlasm/x86_64-xlate.pl" and -f $xlate) or 30die "can't locate x86_64-xlate.pl"; 31 32open OUT,"| \"$^X\" $xlate $flavour $output"; 33*STDOUT=*OUT; 34 35my ($out, $len, $tmp1, $tmp2) = $win64 ? ("%rcx", "%rdx", "%r8", "%r9") 36 : ("%rdi", "%rsi", "%rdx", "%rcx"); 37 38print<<___; 39.text 40 41# CRYPTO_rdrand writes eight bytes of random data from the hardware RNG to 42# |out|. It returns one on success or zero on hardware failure. 43# int CRYPTO_rdrand(uint8_t out[8]); 44.globl CRYPTO_rdrand 45.type CRYPTO_rdrand,\@abi-omnipotent 46.align 16 47CRYPTO_rdrand: 48.cfi_startproc 49 xorq %rax, %rax 50 rdrand $tmp1 51 # An add-with-carry of zero effectively sets %rax to the carry flag. 52 adcq %rax, %rax 53 movq $tmp1, 0($out) 54 retq 55.cfi_endproc 56.size CRYPTO_rdrand,.-CRYPTO_rdrand 57 58# CRYPTO_rdrand_multiple8_buf fills |len| bytes at |buf| with random data from 59# the hardware RNG. The |len| argument must be a multiple of eight. It returns 60# one on success and zero on hardware failure. 61# int CRYPTO_rdrand_multiple8_buf(uint8_t *buf, size_t len); 62.globl CRYPTO_rdrand_multiple8_buf 63.type CRYPTO_rdrand_multiple8_buf,\@abi-omnipotent 64.align 16 65CRYPTO_rdrand_multiple8_buf: 66.cfi_startproc 67 test $len, $len 68 jz .Lout 69 movq \$8, $tmp1 70.Lloop: 71 rdrand $tmp2 72 jnc .Lerr 73 movq $tmp2, 0($out) 74 addq $tmp1, $out 75 subq $tmp1, $len 76 jnz .Lloop 77.Lout: 78 movq \$1, %rax 79 retq 80.Lerr: 81 xorq %rax, %rax 82 retq 83.cfi_endproc 84.size CRYPTO_rdrand_multiple8_buf,.-CRYPTO_rdrand_multiple8_buf 85___ 86 87close STDOUT; # flush 88