ieee_inst.h

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/*
*****************************************************************************
**                                                                          *
**                          COPYRIGHT 1990 BY                               *
**             DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.                *
**                         ALL RIGHTS RESERVED                              *
**                                                                          *
**  THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND  COPIED  *
**  ONLY  IN  ACCORDANCE  WITH  THE  TERMS  OF  SUCH  LICENSE AND WITH THE  *
**  INCLUSION OF THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE OR  ANY  OTHER  *
**  COPIES  THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY  *
**  OTHER PERSON.  NO TITLE TO AND OWNERSHIP OF  THE  SOFTWARE  IS  HEREBY  *
**  TRANSFERRED.                                                            *
**                                                                          *
**  THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE  WITHOUT  NOTICE  *
**  AND  SHOULD  NOT  BE  CONSTRUED  AS  A COMMITMENT BY DIGITAL EQUIPMENT  *
**  CORPORATION.                                                            *
**                                                                          *
**  DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR  RELIABILITY  OF  ITS  *
**  SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL.                 *
**                                                                          *
*****************************************************************************
**++
**  FACILITY:
**
**      SYS
**
**  ABSTRACT:
**
**  AUTHORS:
**
**      Robert Gries
**
**  CREATION DATE:      07-Oct-1993
**
**  MODIFICATION HISTORY:
**      
**      X-1                             Robert Gries            07-Oct-1993
**              Initial implementation
**
**      X-2                             Ellen Batbouta          17-Dec-1993
**              Add new status message, IEEE$_COULD_BE_INTOVF
**  
**      X-3     WBF                     Burns Fisher            26-Oct-1995
**              Retroactively add mod history and add opcodes for byte/word
**              instructions
**
**      X-4     EMB                     Ellen M. Batbouta       31-Jul-1997
**              Eliminate the symbol, __LANGUAGE_C__.  This symbol conflicts
**              with the new C compiler about to be used for our builds.
**
**      X-5     WBF                     Burns Fisher            15-Mar-1999
**              Add opcodes for count instructions: CTLZ, CTPOP, CTTZ
**
**      X-6     EMB                     Ellen M. Batbouta       02-Apr-1999     
**              Add the following constants, IEEE_FLOAT, VAX_FLOATS, SINGLE_PRECISION,
**              and DOUBLE_PRECISION.  These constants are used as input to the
**              square root emulation routine, softfp_isqrt.    Add constants,
**              itfp_sqrts and itfp_sqrtt (the function codes for the IEEE square
**              root functions).
**--
**/

#ifndef _ALPHA_INST_H_
#define _ALPHA_INST_H_  1

/*
** Define constants used as part of the interface
*/

#define IEEE_FLOAT              1
#define VAX_FLOATS              0

#define SINGLE_PRECISION        0
#define DOUBLE_PRECISION        1

/*
 * inst.h -- instruction format defines
 */

union alpha_instruction {
        unsigned long word;
        unsigned char byte[4];

        /* common fields to all instructions */
        struct {
#ifdef __MSDOS__
                unsigned short function_lo: 16;
                unsigned function_hi:10;
#else
                unsigned : 26;
#endif
                unsigned opcode : 6;
        } common;

        /* memory format */
        struct {
                signed memory_displacement : 16;
                unsigned rb : 5;
                unsigned ra : 5;
                unsigned opcode : 6;
        } m_format;

        /* branch format */
        struct {
#ifdef __MSDOS__
                unsigned short branch_displacement_lo;
                unsigned branch_displacement_hi : 5;
#else
                signed branch_displacement : 21;
#endif
                unsigned ra : 5;
                unsigned opcode : 6;
        } b_format;

        /* operate format */
        struct {
                unsigned rc : 5;
                unsigned function : 7;
                unsigned form : 1;
                unsigned : 3;
                unsigned rb : 5;
                unsigned ra : 5;
                unsigned opcode : 6;
        } o_format;

        /* literal (operate) format */
        struct {
                unsigned rc : 5;
                unsigned function : 7;
                unsigned form : 1;
#ifdef __MSDOS__
                unsigned literal_lo : 3;
                unsigned literal_hi : 5;
#else
                unsigned literal : 8;
#endif
                unsigned ra : 5;
                unsigned opcode : 6;
        } l_format;

        /* floating point format */
        struct {
                unsigned fc: 5;
                unsigned fnc: 4;
                unsigned src: 2;
                unsigned rnd: 2;
                unsigned u: 1;
                unsigned ie: 1;
                unsigned s: 1;
                unsigned fb : 5;
                unsigned fa : 5;
                unsigned opcode : 6;
        } f_format;

        /* indepentent floating point format */
        struct {
                unsigned fc: 5;
                unsigned function : 11;
                unsigned fb : 5;
                unsigned fa : 5;
                unsigned opcode : 6;
        } ipf_format;

        /* vax floating point format */
        struct {
                unsigned fc: 5;
                unsigned function : 11;
                unsigned fb : 5;
                unsigned fa : 5;
                unsigned opcode : 6;
        } vax_format;

        /* pal format */
        struct {
#ifdef __MSDOS__
                unsigned short function_lo: 16;
                unsigned function_hi:10;
#else
                unsigned function: 26;
#endif
                unsigned opcode : 6;
        } pal_format;

        /* jsr (memory) format */
        struct {
                signed hint : 14;
                unsigned function : 2;
                unsigned rb : 5;
                unsigned ra : 5;
                unsigned opcode : 6;
        } j_format;
};

/* This section is for status codes.  The one currently defined below
 * is returned by DECODE_INSTRUCTION when it determines that the current
 * instruction is either CVTQL/SV or CVTGQ/SV
 */

#define IEEE$_COULD_BE_INTOVF 2

/*
 * The following are the major instruction opcodes which are contained
 * in the 6-bit 'opcode' field above. The opcodes which are commented as
 * being a "group" have sub-opcodes which are defined later.
 */
#define op_call_pal     0x00            /* pal group; see pal.h functions */
#define op_opc01        0x01
#define op_opc02        0x02
#define op_opc03        0x03
#define op_opc04        0x04
#define op_opc05        0x05
#define op_opc06        0x06
#define op_opc07        0x07
#define op_lda          0x08
#define op_ldah         0x09
#define op_ldbu         0x0a
#define op_ldq_u        0x0b
#define op_ldwu         0x0c
#define op_stw          0x0d
#define op_stb          0x0e
#define op_stq_u        0x0f
#define op_inta         0x10            /* integer arithmetic group */
#define op_intl         0x11            /* integer logical group */
#define op_ints         0x12            /* integer shift group */
#define op_intm         0x13            /* integer multiply group */
#define op_itfp         0x14            /* Integer to floating point register move opcodes */
#define op_fltv         0x15            /* vax floating point group */
#define op_flti         0x16            /* ieee floating point group */
#define op_fltl         0x17            /* datatype independent FP group */
#define op_misc         0x18            /* miscellenous group */
#define op_pal19        0x19
#define op_jsr          0x1a            /* jsr group */
#define op_pal1b        0x1b
#define op_sext         0x1c            /* sext b/w group */
#define op_pal1d        0x1d
#define op_pal1e        0x1e
#define op_pal1f        0x1f
#define op_ldf          0x20
#define op_ldg          0x21
#define op_lds          0x22
#define op_ldt          0x23
#define op_stf          0x24
#define op_stg          0x25
#define op_sts          0x26
#define op_stt          0x27
#define op_ldl          0x28
#define op_ldq          0x29
#define op_ldl_l        0x2a
#define op_ldq_l        0x2b
#define op_stl          0x2c
#define op_stq          0x2d
#define op_stl_c        0x2e
#define op_stq_c        0x2f
#define op_br           0x30
#define op_fbeq         0x31
#define op_fblt         0x32
#define op_fble         0x33
#define op_bsr          0x34
#define op_fbne         0x35
#define op_fbge         0x36
#define op_fbgt         0x37
#define op_blbc         0x38
#define op_beq          0x39
#define op_blt          0x3a
#define op_ble          0x3b
#define op_blbs         0x3c
#define op_bne          0x3d
#define op_bge          0x3e
#define op_bgt          0x3f

/*
 * op_inta: integer arithmetic group. These instructions are operate format
 * (o_format or l_format) instructions with the function code encoded in
 * the 7-bit 'function' field.
 */
#define inta_addl       0x00
#define inta_s4addl     0x02
#define inta_subl       0x09
#define inta_s4subl     0x0b
#define inta_cmpbge     0x0f
#define inta_s8addl     0x12
#define inta_s8subl     0x1b
#define inta_cmpult     0x1d
#define inta_addq       0x20
#define inta_s4addq     0x22
#define inta_subq       0x29
#define inta_s4subq     0x2b
#define inta_cmpeq      0x2d
#define inta_s8addq     0x32
#define inta_s8subq     0x3b
#define inta_cmpule     0x3d
#define inta_addlv      0x40
#define inta_sublv      0x49
#define inta_cmplt      0x4d
#define inta_addqv      0x60
#define inta_subqv      0x69
#define inta_cmple      0x6d

/*
 * op_intl: integer logical group. These instructions are operate format
 * (o_format or l_format) instructions with the function code encoded in
 * the 7-bit 'function' field.
 */
#define intl_and        0x00
#define intl_bic        0x08
#define intl_cmovlbs    0x14
#define intl_cmovlbc    0x16
#define intl_bis        0x20
#define intl_cmoveq     0x24
#define intl_cmovne     0x26
#define intl_ornot      0x28
#define intl_xor        0x40
#define intl_cmovlt     0x44
#define intl_cmovge     0x46
#define intl_eqv        0x48
#define intl_cmovle     0x64
#define intl_cmovgt     0x66

/*
 * op_ints: integer shift group. These instructions are operate format
 * (o_format or l_format) instructions with the function code encoded in
 * the 7-bit 'function' field.
 */
#define ints_mskbl      0x02
#define ints_extbl      0x06
#define ints_insbl      0x0b
#define ints_mskwl      0x12
#define ints_extwl      0x16
#define ints_inswl      0x1b
#define ints_mskll      0x22
#define ints_extll      0x26
#define ints_insll      0x2b
#define ints_zap        0x30
#define ints_zapnot     0x31
#define ints_mskql      0x32
#define ints_srl        0x34
#define ints_extql      0x36
#define ints_sll        0x39
#define ints_insql      0x3b
#define ints_sra        0x3c
#define ints_mskwh      0x52
#define ints_inswh      0x57
#define ints_extwh      0x5a
#define ints_msklh      0x62
#define ints_inslh      0x67
#define ints_extlh      0x6a
#define ints_mskqh      0x72
#define ints_insqh      0x77
#define ints_extqh      0x7a

/*
 * op_intm: integer multiply group. These instructions are operate format
 * (o_format or l_format) instructions with the function code encoded in
 * the 7-bit 'function' field.
 */
#define intm_mull       0x00
#define intm_mulq       0x20
#define intm_umulh      0x30
#define intm_mullv      0x40
#define intm_mulqv      0x60

/*
 * op_jsr: jsr group. These instructions are memory format (j_format)
 * instructions with the function code encoded in the 2-bit 'function'
 * field.
 */
#define jsr_jmp         0x0
#define jsr_jsr         0x1
#define jsr_ret         0x2
#define jsr_jsr_coroutine 0x3

/*
 * op_misc: miscellenous group. These instructions are memory format
 * (m_format) instructions with the function code encoded in the 16-bit
 * displacement field
 */
#define misc_trapb      0x0000
#define misc_excb       0x0400
#define misc_mb         0x4000
#define misc_wmb        0x4400
#define misc_fetch      0x8000
#define misc_fetch_m    0xa000
#define misc_rpcc       0xc000
#define misc_rc         0xe000
#define misc_rs         0xf000

/*
 * op_fltl: datatype independent floating point group. These instructions
 * are floating point operate format (f_format) instructions with the function
 * code encoded in the 11-bit 'function' field.
 */
#define fltl_cvtlq      0x010
#define fltl_cpys       0x020
#define fltl_cpysn      0x021
#define fltl_cpyse      0x022
#define fltl_mt_fpcr    0x024
#define fltl_mf_fpcr    0x025
#define fltl_fcmoveq    0x02a
#define fltl_fcmovne    0x02b
#define fltl_fcmovlt    0x02c
#define fltl_fcmovge    0x02d
#define fltl_fcmovle    0x02e
#define fltl_fcmovgt    0x02f
#define fltl_cvtql      0x030
#define fltl_cvtqlv     0x130
#define fltl_cvtqlsv    0x530

/*
 * Vax floating point group - Only need to define one instruction.
 */

#define fltv_cvtgqsv    0x5af

/*
 * op_fltl: datatype independent floating point group. These instructions
 * are floating point operate format (f_format) instructions with the function
 * code encoded in the 11-bit 'function' field.
 */
#define fltl_add        0x0
#define fltl_sub        0x1
#define fltl_mul        0x2
#define fltl_div        0x3
#define fltl_cmpun      0x4
#define fltl_cmpeq      0x5
#define fltl_cmplt      0x6
#define fltl_cmple      0x7
#define fltl_res8       0x8
#define fltl_res9       0x9
#define fltl_resa       0xa
#define fltl_resb       0xb
#define fltl_cvtxq      0xf
#define fltl_cvtxf      0xc
#define fltl_cvtxd      0xd
#define fltl_cvtxg      0xe
#define fltl_cvtxq      0xf

/* 
 * op_itfp: Integer to floating point register move group
 */
#define itfp_sqrts 0x08b
#define itfp_sqrtt 0x0ab

/*
 * op_sext: Sign extension group (plus ctx group)
 */
#define sext_sextb      0x0         
#define sext_sextw      0x1         

#define sext_ctpop      0x30
#define sext_ctlz       0x32
#define sext_cttz       0x33

#endif /* _ALPHA_INST_H_ */

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