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Fix for MPI divide on MSVC

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Resolves multiple platform issues when building bignum.c with Microsoft
Visual Studio.
This commit is contained in:
Simon Butcher 2016-01-03 22:39:18 +00:00
parent e5049f46d4
commit 6901e50d81
2 changed files with 11 additions and 4 deletions
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1
include/polarssl/bignum.h
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@ -136,6 +136,7 @@ typedef uint32_t t_udbl;
defined(__s390x__) || defined(__mips64) ) )
typedef int64_t t_sint;
typedef uint64_t t_uint;
/* mbedtls_t_udbl defined as 128-bit unsigned int */
typedef unsigned int t_udbl __attribute__((mode(TI)));
#define POLARSSL_HAVE_UDBL
#else

14
library/bignum.c
View file

@ -1097,6 +1097,12 @@ static t_uint int_div_int(t_uint u1, t_uint u0, t_uint d, t_uint *r)
{
#if defined(POLARSSL_HAVE_UDBL)
t_udbl dividend, quotient;
#else
const t_uint radix = (t_uint) 1 << biH;
const t_uint uint_halfword_mask = ( (t_uint) 1 << biH ) - 1;
t_uint d0, d1, q0, q1, rAX, r0, quotient;
t_uint u0_msw, u0_lsw;
size_t s;
#endif
/*
@ -1117,7 +1123,7 @@ static t_uint int_div_int(t_uint u1, t_uint u0, t_uint d, t_uint *r)
quotient = ( (t_udbl) 1 << biL ) - 1;
if( r != NULL )
*r = dividend - (quotient * d);
*r = (t_uint)( dividend - (quotient * d ) );
return (t_uint) quotient;
#else
@ -1138,14 +1144,14 @@ static t_uint int_div_int(t_uint u1, t_uint u0, t_uint d, t_uint *r)
d = d << s;
u1 = u1 << s;
u1 |= (u0 >> (32 - s)) & ( (-s) >> 31);
u1 |= ( u0 >> ( biL - s ) ) & ( -(t_sint)s >> ( biL - 1 ) );
u0 = u0 << s;
d1 = d >> biH;
d0 = d & 0xffff;
d0 = d & uint_halfword_mask;
u0_msw = u0 >> biH;
u0_lsw = u0 & 0xffff;
u0_lsw = u0 & uint_halfword_mask;
/*
* Find the first quotient and remainder