| // This file is generated from a similarly-named Perl script in the BoringSSL |
| // source tree. Do not edit by hand. |
| |
| #include <openssl/asm_base.h> |
| |
| #if !defined(OPENSSL_NO_ASM) && defined(OPENSSL_X86_64) && defined(__ELF__) |
| .text |
| |
| // CRYPTO_rdrand writes eight bytes of random data from the hardware RNG to |
| // |out|. It returns one on success or zero on hardware failure. |
| // int CRYPTO_rdrand(uint8_t out[8]); |
| .globl CRYPTO_rdrand |
| .hidden CRYPTO_rdrand |
| .type CRYPTO_rdrand,@function |
| .align 16 |
| CRYPTO_rdrand: |
| .cfi_startproc |
| _CET_ENDBR |
| xorq %rax,%rax |
| rdrand %rdx |
| // An add-with-carry of zero effectively sets %rax to the carry flag. |
| adcq %rax,%rax |
| movq %rdx,0(%rdi) |
| ret |
| .cfi_endproc |
| .size CRYPTO_rdrand,.-CRYPTO_rdrand |
| |
| // CRYPTO_rdrand_multiple8_buf fills |len| bytes at |buf| with random data from |
| // the hardware RNG. The |len| argument must be a multiple of eight. It returns |
| // one on success and zero on hardware failure. |
| // int CRYPTO_rdrand_multiple8_buf(uint8_t *buf, size_t len); |
| .globl CRYPTO_rdrand_multiple8_buf |
| .hidden CRYPTO_rdrand_multiple8_buf |
| .type CRYPTO_rdrand_multiple8_buf,@function |
| .align 16 |
| CRYPTO_rdrand_multiple8_buf: |
| .cfi_startproc |
| _CET_ENDBR |
| testq %rsi,%rsi |
| jz .Lout |
| movq $8,%rdx |
| .Lloop: |
| rdrand %rcx |
| jnc .Lerr |
| movq %rcx,0(%rdi) |
| addq %rdx,%rdi |
| subq %rdx,%rsi |
| jnz .Lloop |
| .Lout: |
| movq $1,%rax |
| ret |
| .Lerr: |
| xorq %rax,%rax |
| ret |
| .cfi_endproc |
| .size CRYPTO_rdrand_multiple8_buf,.-CRYPTO_rdrand_multiple8_buf |
| #endif |
