248abbd71f
This tripped up some version of GCC or Clang. Change-Id: I925423558f188ce39b65b2e2ecd01bf009fab071
76 lines
2.3 KiB
Raku
76 lines
2.3 KiB
Raku
#!/usr/bin/env perl
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# Copyright (c) 2015, Google Inc.
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#
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# Permission to use, copy, modify, and/or distribute this software for any
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# purpose with or without fee is hereby granted, provided that the above
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# 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 WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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# SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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# OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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$flavour = shift;
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$output = shift;
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if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
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$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
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( $xlate="${dir}../../perlasm/x86_64-xlate.pl" and -f $xlate) or
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die "can't locate x86_64-xlate.pl";
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open OUT,"| \"$^X\" $xlate $flavour $output";
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*STDOUT=*OUT;
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print<<___;
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.text
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# CRYPTO_rdrand writes eight bytes of random data from the hardware RNG to
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# |out|. It returns one on success or zero on hardware failure.
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# int CRYPTO_rdrand(uint8_t out[8]);
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.globl CRYPTO_rdrand
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.type CRYPTO_rdrand,\@function,1
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.align 16
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CRYPTO_rdrand:
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xorq %rax, %rax
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# This is rdrand %rcx. It sets rcx to a random value and sets the carry
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# flag on success.
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.byte 0x48, 0x0f, 0xc7, 0xf1
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# An add-with-carry of zero effectively sets %rax to the carry flag.
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adcq %rax, %rax
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movq %rcx, 0(%rdi)
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retq
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# CRYPTO_rdrand_multiple8_buf fills |len| bytes at |buf| with random data from
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# the hardware RNG. The |len| argument must be a multiple of eight. It returns
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# one on success and zero on hardware failure.
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# int CRYPTO_rdrand_multiple8_buf(uint8_t *buf, size_t len);
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.globl CRYPTO_rdrand_multiple8_buf
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.type CRYPTO_rdrand_multiple8_buf,\@function,2
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.align 16
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CRYPTO_rdrand_multiple8_buf:
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test %rsi, %rsi
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jz .Lout
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movq \$8, %rdx
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.Lloop:
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# This is rdrand %rcx. It sets rcx to a random value and sets the carry
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# flag on success.
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.byte 0x48, 0x0f, 0xc7, 0xf1
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jnc .Lerr
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movq %rcx, 0(%rdi)
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addq %rdx, %rdi
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subq %rdx, %rsi
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jnz .Lloop
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.Lout:
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movq \$1, %rax
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retq
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.Lerr:
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xorq %rax, %rax
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retq
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___
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close STDOUT; # flush
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