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/*
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Crown Copyright (c) 1996
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This TenDRA(r) Computer Program is subject to Copyright
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owned by the United Kingdom Secretary of State for Defence
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acting through the Defence Evaluation and Research Agency
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(DERA). It is made available to Recipients with a
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royalty-free licence for its use, reproduction, transfer
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to other parties and amendment for any purpose not excluding
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product development provided that any such use et cetera
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shall be deemed to be acceptance of the following conditions:-
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(1) Its Recipients shall ensure that this Notice is
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reproduced upon any copies or amended versions of it;
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(2) Any amended version of it shall be clearly marked to
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show both the nature of and the organisation responsible
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for the relevant amendment or amendments;
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(3) Its onward transfer from a recipient to another
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party shall be deemed to be that party's acceptance of
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these conditions;
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(4) DERA gives no warranty or assurance as to its
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quality or suitability for any purpose and DERA accepts
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no liability whatsoever in relation to any use to which
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it may be put.
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*/
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/*
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VERSION INFORMATION
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===================
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--------------------------------------------------------------------------
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$Header: /u/g/release/CVSROOT/Source/src/installers/680x0/common/ops_shared.h,v 1.1.1.1 1998/01/17 15:55:50 release Exp $
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--------------------------------------------------------------------------
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$Log: ops_shared.h,v $
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* Revision 1.1.1.1 1998/01/17 15:55:50 release
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* First version to be checked into rolling release.
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*
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Revision 1.1.1.1 1997/10/13 12:42:57 ma
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First version.
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Revision 1.3 1997/10/13 08:50:06 ma
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Made all pl_tests for general proc & exception handling pass.
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Revision 1.2 1997/09/25 06:45:30 ma
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All general_proc tests passed
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Revision 1.1.1.1 1997/03/14 07:50:16 ma
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Imported from DRA
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* Revision 1.1.1.1 1996/09/20 10:56:57 john
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*
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* Revision 1.2 1996/07/05 14:25:35 john
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* Changes for spec 3.1
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*
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* Revision 1.1.1.1 1996/03/26 15:45:16 john
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*
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* Revision 1.2 93/03/03 14:50:17 14:50:17 ra (Robert Andrews)
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* Added support for jump_overflow routine.
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*
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* Revision 1.1 93/02/22 17:16:28 17:16:28 ra (Robert Andrews)
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* Initial revision
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*
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--------------------------------------------------------------------------
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*/
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#ifndef OPS_SHARED_INCLUDED
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#define OPS_SHARED_INCLUDED
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/*
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KEY TO OVERFLOW JUMPS
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The argument to jump_overflow is one of the following.
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*/
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typedef enum {
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UNCONDITIONAL,
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ON_OVERFLOW,
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ON_CARRY,
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ON_FP_OVERFLOW,
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ON_FP_CARRY,
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ON_FP_OPERAND_ERROR
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} overflow_type ;
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#define ON_SHAPE( s ) ( is_signed ( s ) ? ON_OVERFLOW : ON_CARRY )
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/*
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PROTOTYPES
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This file is a relic of the old operations.c which was split into
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the four ops_*.c files. These routines were previously static but
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now must be external.
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*/
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extern void branch PROTO_S ( ( long, exp, int, int, int ) ) ;
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extern int branch_ins PROTO_S ( ( long, int, int, int ) ) ;
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extern void jump_overflow PROTO_S ( ( int ) ) ;
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extern void test_overflow PROTO_S ( ( overflow_type ) ) ;
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extern void test_overflow2 PROTO_S ( ( int ) ) ;
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extern void push PROTO_S ( ( shape, long, where ) ) ;
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extern void push_float PROTO_S ( ( long, where ) ) ;
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extern void pop PROTO_S ( ( shape, long, where ) ) ;
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extern void pop_float PROTO_S ( ( long, where ) ) ;
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extern void shift_aux PROTO_S ( ( shape, where, where, where, int, int ) ) ;
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extern void checkalloc_stack PROTO_S ( (where, int) );
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extern int set_overflow PROTO_S ( ( exp ) );
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extern int have_overflow PROTO_S ( ( void ) );
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extern void clear_overflow PROTO_S ( ( int ) );
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extern void reset_round_mode PROTO_S ( ( void ) );
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extern void cmp_zero PROTO_S ( ( shape, long, where ) ) ;
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/*
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CONDITION CODES
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These condition codes are used to eliminate unnecessary comparison
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instructions.
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*/
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extern where last_cond ;
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extern where last_cond2 ;
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extern where last_cond_alt ;
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extern long last_cond_sz ;
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/*
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SET CONDITION CODES
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This macro is used to set the condition codes for the where X of
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size Y.
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*/
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#define set_cond( X, Y ) \
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{ \
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have_cond = 1 ; \
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last_cond = ( X ) ; \
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last_cond_sz = ( Y ) ; \
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}
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/*
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SET ALTERNATIVE CONDITION CODES
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This macro is used to set the alterative last condition to X.
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*/
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#define set_cond_alt( X ) \
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{ \
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have_cond = 3 ; \
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last_cond_alt = ( X ) ; \
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}
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/*
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OUTPUT A COMPARISON INSTRUCTION
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Some assemblers (e.g. HP) reverse the order of the operands in
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comparison instructions. This macro handles this fact.
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*/
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#ifndef asm_cmp_reversed
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#define ins2_cmp( I, S1, S2, X1, X2, M ) ins2 ( I, S1, S2, X1, X2, M )
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#else
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#define ins2_cmp( I, S1, S2, X1, X2, M ) ins2 ( I, S2, S1, X2, X1, M )
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#endif
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#endif
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