tree cb98fbdce3e3d72f46d3b2d7d3b473b16b01abdc
parent a5f8b420561b198a310600cfc9f8f0bd1c179f49
author James Cowgill <james410@cowgill.org.uk> 1450317069 +0000
committer Gilles Peskine <Gilles.Peskine@arm.com> 1517259266 +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.