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| author | Adam Langley <agl@google.com> | 2015-06-23 16:28:07 -0700 |
|---|---|---|
| committer | Adam Langley <agl@google.com> | 2015-06-23 16:33:55 -0700 |
| commit | bd9957e6e28506c4431ce8d3cadbc0a04905b15e (patch) | |
| tree | 25164b0a84665df0c05eb07a4abb82b39fa6d6a0 /win-x86_64/crypto/rand/rdrand-x86_64.asm | |
| parent | e0846beeb321f7d3170e4e389950b12fce69ab10 (diff) | |
| download | external_boringssl-bd9957e6e28506c4431ce8d3cadbc0a04905b15e.zip external_boringssl-bd9957e6e28506c4431ce8d3cadbc0a04905b15e.tar.gz external_boringssl-bd9957e6e28506c4431ce8d3cadbc0a04905b15e.tar.bz2 | |
Handle RDRAND failures.
I mistakenly believed that only RDSEED could fail. However, the Intel
manuals state that RDRAND can fail too.
This change cherry-picks the following BoringSSL changes:
2cac3506 – Handle RDRAND failures.
248abbd7 – Add missing comma in .type pragma for rdrand code.
Change-Id: Icdc56a50ce36e9c525063583882c676a5312d313
Diffstat (limited to 'win-x86_64/crypto/rand/rdrand-x86_64.asm')
| -rw-r--r-- | win-x86_64/crypto/rand/rdrand-x86_64.asm | 50 |
1 files changed, 49 insertions, 1 deletions
diff --git a/win-x86_64/crypto/rand/rdrand-x86_64.asm b/win-x86_64/crypto/rand/rdrand-x86_64.asm index a63ea69..4c03791 100644 --- a/win-x86_64/crypto/rand/rdrand-x86_64.asm +++ b/win-x86_64/crypto/rand/rdrand-x86_64.asm @@ -5,6 +5,9 @@ default rel section .text code align=64 + + + global CRYPTO_rdrand ALIGN 16 @@ -16,7 +19,52 @@ $L$SEH_begin_CRYPTO_rdrand: mov rdi,rcx -DB 0x48,0x0f,0xc7,0xf0 + xor rax,rax + + +DB 0x48,0x0f,0xc7,0xf1 + + adc rax,rax + mov QWORD[rdi],rcx + mov rdi,QWORD[8+rsp] ;WIN64 epilogue + mov rsi,QWORD[16+rsp] + DB 0F3h,0C3h ;repret + + + + + +global CRYPTO_rdrand_multiple8_buf + +ALIGN 16 +CRYPTO_rdrand_multiple8_buf: + mov QWORD[8+rsp],rdi ;WIN64 prologue + mov QWORD[16+rsp],rsi + mov rax,rsp +$L$SEH_begin_CRYPTO_rdrand_multiple8_buf: + mov rdi,rcx + mov rsi,rdx + + + test rsi,rsi + jz NEAR $L$out + mov rdx,8 +$L$loop: + + +DB 0x48,0x0f,0xc7,0xf1 + jnc NEAR $L$err + mov QWORD[rdi],rcx + add rdi,rdx + sub rsi,rdx + jnz NEAR $L$loop +$L$out: + mov rax,1 + mov rdi,QWORD[8+rsp] ;WIN64 epilogue + mov rsi,QWORD[16+rsp] + DB 0F3h,0C3h ;repret +$L$err: + xor rax,rax mov rdi,QWORD[8+rsp] ;WIN64 epilogue mov rsi,QWORD[16+rsp] DB 0F3h,0C3h ;repret |