diff options
Diffstat (limited to 'deps/openssl/openssl/crypto/bn/asm/x86-mont.pl')
| -rwxr-xr-x | deps/openssl/openssl/crypto/bn/asm/x86-mont.pl | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/deps/openssl/openssl/crypto/bn/asm/x86-mont.pl b/deps/openssl/openssl/crypto/bn/asm/x86-mont.pl index e8f6b05084..89f4de61e8 100755 --- a/deps/openssl/openssl/crypto/bn/asm/x86-mont.pl +++ b/deps/openssl/openssl/crypto/bn/asm/x86-mont.pl @@ -85,6 +85,21 @@ $frame=32; # size of above frame rounded up to 16n &and ("esp",-64); # align to cache line + # Some OSes, *cough*-dows, insist on stack being "wired" to + # physical memory in strictly sequential manner, i.e. if stack + # allocation spans two pages, then reference to farmost one can + # be punishable by SEGV. But page walking can do good even on + # other OSes, because it guarantees that villain thread hits + # the guard page before it can make damage to innocent one... + &mov ("eax","ebp"); + &sub ("eax","esp"); + &and ("eax",-4096); +&set_label("page_walk"); + &mov ("edx",&DWP(0,"esp","eax")); + &sub ("eax",4096); + &data_byte(0x2e); + &jnc (&label("page_walk")); + ################################# load argument block... &mov ("eax",&DWP(0*4,"esi"));# BN_ULONG *rp &mov ("ebx",&DWP(1*4,"esi"));# const BN_ULONG *ap |