bni80386.h

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/*
* bni80386.h - This file defines the interfaces to the 80386
* assembly primitives. It is intended to be included in "bni.h"
* via the "#include BNINCLUDE" mechanism.
*
* Copyright (C) 1995-1997 Pretty Good Privacy, Inc. All rights reserved.
*
* $Id: bni80386.h,v 1.2.4.1 1997/06/07 09:49:32 mhw Exp $
*/

#define BN_LITTLE_ENDIAN 1

typedef unsigned long bnword32;
#define BNWORD32 bnword32

/* MS-DOS needs the calling convention described to it. */
#ifndef MSDOS
#ifdef __MSDOS
#define MSDOS 1
#endif
#endif
#ifndef MSDOS
#ifdef __MSDOS__
#define MSDOS 1
#endif
#endif

/* By MS-DOS, we mean 16-bit brain-dead MS-DOS. Not 32-bit good things. */
#ifdef __GO32
#undef MSDOS
#endif
#ifdef __GO32__
#undef MSDOS
#endif

#ifdef MSDOS
#define CDECL __cdecl
#else
#define CDECL /*nothing*/
#endif

#ifdef __cplusplus
/* These assembly-language primitives use C names */
extern "C" {
#endif

/* Function prototypes for the asm routines */
void CDECL
bniMulN1_32(bnword32 *out, bnword32 const *in, unsigned len, bnword32 k);
#define bniMulN1_32 bniMulN1_32

bnword32 CDECL
bniMulAdd1_32(bnword32 *out, bnword32 const *in, unsigned len, bnword32 k);
#define bniMulAdd1_32 bniMulAdd1_32

bnword32 CDECL
bniMulSub1_32(bnword32 *out, bnword32 const *in, unsigned len, bnword32 k);
#define bniMulSub1_32 bniMulSub1_32

bnword32 CDECL
bniDiv21_32(bnword32 *q, bnword32 nh, bnword32 nl, bnword32 d);
#define bniDiv21_32 bniDiv21_32

unsigned CDECL
bniModQ_32(bnword32 const *n, unsigned len, bnword32 d);
#define bniModQ_32 bniModQ_32

#ifdef __cplusplus
}
#endif


#if __GNUC__
/*
* Use the (massively cool) GNU inline-assembler extension to define
* inline expansions for various operations.
*
* The massively cool part is that the assembler can have inputs
* and outputs, and you specify the operands and which effective
* addresses are legal and they get substituted into the code.
* (For example, some of the code requires a zero. Rather than
* specify an immediate constant, the expansion specifies an operand
* of zero which can be in various places. This lets GCC use an
* immediate zero, or a register which contains zero if it's available.)
*
* The syntax is asm("asm_code" : outputs : inputs : trashed)
* %0, %1 and so on in the asm code are substituted by the operands
* in left-to-right order (outputs, then inputs).
* The operands contain constraint strings and values to use.
* Outputs must be lvalues, inputs may be rvalues. In the constraints:
* "a" means that the operand must be in eax.
* "d" means that the operand must be in edx.
* "g" means that the operand may be any effective address.
* "=" means that the operand is assigned to.
* "%" means that this operand and the following one may be
* interchanged if desirable.
* "bcDSmn" means that the operand must be in ebx, ecx, esi, edi, memory,
*	or an immediate constant. (This is almost the same as "g"
*	but allowing it in eax wouldn't help because x is already
*	assigned there, and it must not be in edx, since edx is
*	overwritten by the multiply before a and b are read.)
*
* Note that GCC uses AT&T assembler syntax, which is rather
* different from Intel syntax. The length (b, w or l) of the
* operation is appended to the opcode, and the *second* operand
* is the destination, not the first. Finally, the register names
* are all preceded with "%". (Doubled here because % is a
* magic character.)
*/

/* (ph<<32) + pl = x*y */
#define mul32_ppmm(ph,pl,x,y)	\
	__asm__("mull %3" : "=d"(ph), "=a"(pl) : "%a"(x), "g"(y))

/* (ph<<32) + pl = x*y + a */
#define mul32_ppmma(ph,pl,x,y,a)	\
			__asm__("mull %3\n\t"		\
			"addl %4,%%eax\n\t"	\
			"adcl %5,%%edx"		 \
			: "=&d"(ph), "=a"(pl)	\
			: "%a"(x), "g"(y), "bcDSmn"(a), "bcDSmn"(0))

/* (ph<<32) + pl = x*y + a + b */
#define mul32_ppmmaa(ph,pl,x,y,a,b)	 \
			__asm__("mull %3\n\t"			\
			"addl %4,%%eax\n\t"		\
			"adcl %6,%%edx\n\t"		\
			"addl %5,%%eax\n\t"		\
			"adcl %6,%%edx"			\
			: "=&d"(ph), "=a"(pl)	\
			: "%a"(x), "g"(y), "%bcDSmn"(a), "bcDSmn"(b), "bcDSmn"(0))

/* q = ((nh<<32) + nl) / d, return remainder. nh guaranteed < d. */
#undef bniDiv21_32
#define bniDiv21_32(q,nh,nl,d)	\
	({unsigned _;	 \
	__asm__("divl %4" : "=d"(_), "=a"(*q)	: "d"(nh), "a"(nl), "g"(d)); \
	_;})

/* No quotient, just return remainder ((nh<<32) + nl) % d */
#define bniMod21_32(nh,nl,d)	\
	({unsigned _;	 \
	__asm__("divl %3" : "=d"(_) : "d"(nh), "a"(nl), "g"(d) : "ax"); \
	_;})

#endif /* __GNUC__ */