| // 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 |