tree 239760dd887f80f56c90a49e0bd97c9496a1779b
parent 5c1e24ca055c851953bf4a5b3215a27f9f54a00c
author James Cowgill <james410@cowgill.org.uk> 1450317069 +0000
committer Simon Butcher <simon.butcher@arm.com> 1464010168 +0100

Fix segfault on x32 by using better register constraints in bn_mul.h

On x32, pointers are only 4-bytes wide and need to be loaded using the "movl"
instruction instead of "movq" to avoid loading garbage into the register.

The MULADDC routines for x86-64 are adjusted to work on x32 as well by getting
gcc to load all the registers for us in advance (and storing them later) by
using better register constraints. The b, c, D and S constraints correspond to
the rbx, rcx, rdi and rsi registers respectively.