Subversion Repositories openrisc_2011-10-31

/* pyramid.opcode.h -- gdb initial attempt.

   Copyright 2001 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2, or (at your option)

   any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor,

   Boston, MA 02110-1301, USA.  */

/* pyramid opcode table: wot to do with this

   particular opcode */

struct pyr_datum

{

  char              nargs;

  char *            args;       /* how to compile said opcode */

  unsigned long     mask;       /* Bit vector: which operand modes are valid

                                   for this opcode */

  unsigned char     code;       /* op-code (always 6(?) bits */

};

typedef struct pyr_insn_format

{

    unsigned int mode :4;

    unsigned int operator :8;

    unsigned int index_scale :2;

    unsigned int index_reg :6;

    unsigned int operand_1 :6;

    unsigned int operand_2:6;

} pyr_insn_format;

/* We store four bytes of opcode for all opcodes.

   Pyramid is sufficiently RISCy that:

      - insns are always an integral number of words;

      - the length of any insn can be told from the first word of

        the insn. (ie, if there are zero, one, or two words of

        immediate operand/offset).

   The args component is a string containing two characters for each

   operand of the instruction.  The first specifies the kind of operand;

   the second, the place it is stored. */

/* Kinds of operands:

   mask  assembler syntax       description

   0x0001:  movw Rn,Rn          register to register

   0x0002:  movw K,Rn           quick immediate to register

   0x0004:  movw I,Rn           long immediate to register

   0x0008:  movw (Rn),Rn        register indirect to register

            movw (Rn)[x],Rn     register indirect to register

   0x0010:  movw I(Rn),Rn       offset register indirect to register

            movw I(Rn)[x],Rn    offset register indirect, indexed, to register

   0x0020:  movw Rn,(Rn)        register to register indirect

   0x0040:  movw K,(Rn)         quick immediate to register indirect

   0x0080:  movw I,(Rn)         long immediate to register indirect

   0x0100:  movw (Rn),(Rn)      register indirect to-register indirect

   0x0100:  movw (Rn),(Rn)      register indirect to-register indirect

   0x0200:  movw I(Rn),(Rn)     register indirect+offset to register indirect

   0x0200:  movw I(Rn),(Rn)     register indirect+offset to register indirect

   0x0400:  movw Rn,I(Rn)       register to register indirect+offset

   0x0800:  movw K,I(Rn)        quick immediate to register indirect+offset

   0x1000:  movw I,I(Rn)        long immediate to register indirect+offset

   0x1000:  movw (Rn),I(Rn)     register indirect to-register indirect+offset

   0x1000:  movw I(Rn),I(Rn)    register indirect+offset to register indirect

                                        +offset

   0x0000:  (irregular)         ???

   Each insn has a four-bit field encoding the type(s) of its operands.

*/

/* Some common combinations

   */

/* the first 5,(0x1|0x2|0x4|0x8|0x10) ie (1|2|4|8|16), ie ( 32 -1)*/

#define GEN_TO_REG (31)

#define UNKNOWN ((unsigned long)-1)

#define ANY (GEN_TO_REG | (GEN_TO_REG << 5) | (GEN_TO_REG << 15))

#define CONVERT (1|8|0x10|0x20|0x200)

#define K_TO_REG (2)

#define I_TO_REG (4)

#define NOTK_TO_REG (GEN_TO_REG & ~K_TO_REG)

#define NOTI_TO_REG (GEN_TO_REG & ~I_TO_REG)

/* The assembler requires that this array be sorted as follows:

   all instances of the same mnemonic must be consecutive.

   All instances of the same mnemonic with the same number of operands

   must be consecutive.

 */

struct pyr_opcode               /* pyr opcode text */

{

  char *            name;       /* opcode name: lowercase string  [key]  */

  struct pyr_datum  datum;      /* rest of opcode table          [datum] */

};

#define pyr_how args

#define pyr_nargs nargs

#define pyr_mask mask

#define pyr_name name

struct pyr_opcode pyr_opcodes[] =

{

  {"movb",      { 2, "", UNKNOWN,               0x11}, },

  {"movh",      { 2, "", UNKNOWN,               0x12} },

  {"movw",      { 2, "", ANY,                   0x10} },

  {"movl",      { 2, "", ANY,                   0x13} },

  {"mnegw",     { 2, "", (0x1|0x8|0x10),        0x14} },

  {"mnegf",     { 2, "", 0x1,                   0x15} },

  {"mnegd",     { 2, "", 0x1,                   0x16} },

  {"mcomw",     { 2, "", (0x1|0x8|0x10),        0x17} },

  {"mabsw",     { 2, "", (0x1|0x8|0x10),        0x18} },

  {"mabsf",     { 2, "", 0x1,                   0x19} },

  {"mabsd",     { 2, "", 0x1,                   0x1a} },

  {"mtstw",     { 2, "", (0x1|0x8|0x10),        0x1c} },

  {"mtstf",     { 2, "", 0x1,                   0x1d} },

  {"mtstd",     { 2, "", 0x1,                   0x1e} },

  {"mova",      { 2, "", 0x8|0x10,              0x1f} },

  {"movzbw",    { 2, "", (0x1|0x8|0x10),        0x20} },

  {"movzhw",    { 2, "", (0x1|0x8|0x10),        0x21} },

                                /* 2 insns out of order here */

  {"movbl",     { 2, "", 1,                     0x4f} },

  {"filbl",     { 2, "", 1,                     0x4e} },

  {"cvtbw",     { 2, "", CONVERT,               0x22} },

  {"cvthw",     { 2, "", CONVERT,               0x23} },

  {"cvtwb",     { 2, "", CONVERT,               0x24} },

  {"cvtwh",     { 2, "", CONVERT,               0x25} },

  {"cvtwf",     { 2, "", CONVERT,               0x26} },

  {"cvtwd",     { 2, "", CONVERT,               0x27} },

  {"cvtfw",     { 2, "", CONVERT,               0x28} },

  {"cvtfd",     { 2, "", CONVERT,               0x29} },

  {"cvtdw",     { 2, "", CONVERT,               0x2a} },

  {"cvtdf",     { 2, "", CONVERT,               0x2b} },

  {"addw",      { 2, "", GEN_TO_REG,            0x40} },

  {"addwc",     { 2, "", GEN_TO_REG,            0x41} },

  {"subw",      { 2, "", GEN_TO_REG,            0x42} },

  {"subwb",     { 2, "", GEN_TO_REG,            0x43} },

  {"rsubw",     { 2, "", GEN_TO_REG,            0x44} },

  {"mulw",      { 2, "", GEN_TO_REG,            0x45} },

  {"emul",      { 2, "", GEN_TO_REG,            0x47} },

  {"umulw",     { 2, "", GEN_TO_REG,            0x46} },

  {"divw",      { 2, "", GEN_TO_REG,            0x48} },

  {"ediv",      { 2, "", GEN_TO_REG,            0x4a} },

  {"rdivw",     { 2, "", GEN_TO_REG,            0x4b} },

  {"udivw",     { 2, "", GEN_TO_REG,            0x49} },

  {"modw",      { 2, "", GEN_TO_REG,            0x4c} },

  {"umodw",     { 2, "", GEN_TO_REG,            0x4d} },

  {"addf",      { 2, "", 1,                     0x50} },

  {"addd",      { 2, "", 1,                     0x51} },

  {"subf",      { 2, "", 1,                     0x52} },

  {"subd",      { 2, "", 1,                     0x53} },

  {"mulf",      { 2, "", 1,                     0x56} },

  {"muld",      { 2, "", 1,                     0x57} },

  {"divf",      { 2, "", 1,                     0x58} },

  {"divd",      { 2, "", 1,                     0x59} },

  {"cmpb",      { 2, "", UNKNOWN,               0x61} },

  {"cmph",      { 2, "", UNKNOWN,               0x62} },

  {"cmpw",      { 2, "", UNKNOWN,               0x60} },

  {"ucmpb",     { 2, "", UNKNOWN,               0x66} },

  /* WHY no "ucmph"??? */

  {"ucmpw",     { 2, "", UNKNOWN,               0x65} },

  {"xchw",      { 2, "", UNKNOWN,               0x0f} },

  {"andw",      { 2, "", GEN_TO_REG,            0x30} },

  {"orw",       { 2, "", GEN_TO_REG,            0x31} },

  {"xorw",      { 2, "", GEN_TO_REG,            0x32} },

  {"bicw",      { 2, "", GEN_TO_REG,            0x33} },

  {"lshlw",     { 2, "", GEN_TO_REG,            0x38} },

  {"ashlw",     { 2, "", GEN_TO_REG,            0x3a} },

  {"ashll",     { 2, "", GEN_TO_REG,            0x3c} },

  {"ashrw",     { 2, "", GEN_TO_REG,            0x3b} },

  {"ashrl",     { 2, "", GEN_TO_REG,            0x3d} },

  {"rotlw",     { 2, "", GEN_TO_REG,            0x3e} },

  {"rotrw",     { 2, "", GEN_TO_REG,            0x3f} },

  /* push and pop insns are "going away next release". */

  {"pushw",     { 2, "", GEN_TO_REG,            0x0c} },

  {"popw",      { 2, "", (0x1|0x8|0x10),        0x0d} },

  {"pusha",     { 2, "", (0x8|0x10),            0x0e} },

  {"bitsw",     { 2, "", UNKNOWN,               0x35} },

  {"bitcw",     { 2, "", UNKNOWN,               0x36} },

  /* some kind of ibra/dbra insns??*/

  {"icmpw",     { 2, "", UNKNOWN,               0x67} },

  {"dcmpw",     { 2, "", (1|4|0x20|0x80|0x400|0x1000),  0x69} },/*FIXME*/

  {"acmpw",     { 2, "", 1,                     0x6b} },

  /* Call is written as a 1-op insn, but is always (dis)assembled as a 2-op

     insn with a 2nd op of tr14.   The assembler will have to grok this.  */

  {"call",      { 2, "", GEN_TO_REG,            0x04} },

  {"call",      { 1, "", GEN_TO_REG,            0x04} },

  {"callk",     { 1, "", UNKNOWN,               0x06} },/* system call?*/

  /* Ret is usually written as a 0-op insn, but gets disassembled as a

     1-op insn. The operand is always tr15. */

  {"ret",       { 0, "", UNKNOWN,                0x09} },

  {"ret",       { 1, "", UNKNOWN,               0x09} },

  {"adsf",      { 2, "", (1|2|4),               0x08} },

  {"retd",      { 2, "", UNKNOWN,               0x0a} },

  {"btc",       { 2, "", UNKNOWN,               0x01} },

  {"bfc",       { 2, "", UNKNOWN,               0x02} },

  /* Careful: halt is 0x00000000. Jump must have some other (mode?)bit set?? */

  {"jump",      { 1, "", UNKNOWN,               0x00} },

  {"btp",       { 2, "", UNKNOWN,               0xf00} },

  /* read control-stack pointer is another 1-or-2 operand insn. */

  {"rcsp",      { 2, "", UNKNOWN,               0x01f} },

  {"rcsp",      { 1, "", UNKNOWN,               0x01f} }

};

/* end: pyramid.opcode.h */

/* One day I will have to take the time to find out what operands

   are valid for these insns, and guess at what they mean.

   I can't imagine what the "I???" insns (iglob, etc) do.

   the arithmetic-sounding insns ending in "p" sound awfully like BCD

   arithmetic insns:

        dshlp -> Decimal SHift Left Packed

        dshrp -> Decimal SHift Right Packed

   and cvtlp would be convert long to packed.

   I have no idea how the operands are interpreted; but having them be

   a long register with (address, length) of an in-memory packed BCD operand

   would not be surprising.

   They are unlikely to be a packed bcd string: 64 bits of long give

   is only 15 digits+sign, which isn't enough for COBOL.

 */

#if 0

  {"wcsp",      { 2, "", UNKNOWN,               0x00} }, /*write csp?*/

  /* The OSx Operating System Porting Guide claims SSL does things

     with tr12 (a register reserved to it) to do with static block-structure

     references.  SSL=Set Static Link?  It's "Going away next release". */

  {"ssl",       { 2, "", UNKNOWN,               0x00} },

  {"ccmps",     { 2, "", UNKNOWN,               0x00} },

  {"lcd",       { 2, "", UNKNOWN,               0x00} },

  {"uemul",     { 2, "", UNKNOWN,               0x00} }, /*unsigned emul*/

  {"srf",       { 2, "", UNKNOWN,               0x00} }, /*Gidget time???*/

  {"mnegp",     { 2, "", UNKNOWN,               0x00} }, /move-neg phys?*/

  {"ldp",       { 2, "", UNKNOWN,               0x00} }, /*load phys?*/

  {"ldti",      { 2, "", UNKNOWN,               0x00} },

  {"ldb",       { 2, "", UNKNOWN,               0x00} },

  {"stp",       { 2, "", UNKNOWN,               0x00} },

  {"stti",      { 2, "", UNKNOWN,               0x00} },

  {"stb",       { 2, "", UNKNOWN,               0x00} },

  {"stu",       { 2, "", UNKNOWN,               0x00} },

  {"addp",      { 2, "", UNKNOWN,               0x00} },

  {"subp",      { 2, "", UNKNOWN,               0x00} },

  {"mulp",      { 2, "", UNKNOWN,               0x00} },

  {"divp",      { 2, "", UNKNOWN,               0x00} },

  {"dshlp",     { 2, "", UNKNOWN,               0x00} },  /* dec shl packed? */

  {"dshrp",     { 2, "", UNKNOWN,               0x00} }, /* dec shr packed? */

  {"movs",      { 2, "", UNKNOWN,               0x00} }, /*move (string?)?*/

  {"cmpp",      { 2, "", UNKNOWN,               0x00} }, /* cmp phys?*/

  {"cmps",      { 2, "", UNKNOWN,               0x00} }, /* cmp (string?)?*/

  {"cvtlp",     { 2, "", UNKNOWN,               0x00} }, /* cvt long to p??*/

  {"cvtpl",     { 2, "", UNKNOWN,               0x00} }, /* cvt p to l??*/

  {"dintr",     { 2, "", UNKNOWN,               0x00} }, /* ?? intr ?*/

  {"rphysw",    { 2, "", UNKNOWN,               0x00} }, /* read phys word?*/

  {"wphysw",    { 2, "", UNKNOWN,               0x00} }, /* write phys word?*/

  {"cmovs",     { 2, "", UNKNOWN,               0x00} },

  {"rsubw",     { 2, "", UNKNOWN,               0x00} },

  {"bicpsw",    { 2, "", UNKNOWN,               0x00} }, /* clr bit in psw? */

  {"bispsw",    { 2, "", UNKNOWN,               0x00} }, /* set bit in psw? */

  {"eio",       { 2, "", UNKNOWN,               0x00} }, /* ?? ?io ? */

  {"callp",     { 2, "", UNKNOWN,               0x00} }, /* call phys?*/

  {"callr",     { 2, "", UNKNOWN,               0x00} },

  {"lpcxt",     { 2, "", UNKNOWN,               0x00} }, /*load proc context*/

  {"rei",       { 2, "", UNKNOWN,               0x00} }, /*ret from intrpt*/

  {"rport",     { 2, "", UNKNOWN,               0x00} }, /*read-port?*/

  {"rtod",      { 2, "", UNKNOWN,               0x00} }, /*read-time-of-day?*/

  {"ssi",       { 2, "", UNKNOWN,               0x00} },

  {"vtpa",      { 2, "", UNKNOWN,               0x00} }, /*virt-to-phys-addr?*/

  {"wicl",      { 2, "", UNKNOWN,               0x00} }, /* write icl ? */

  {"wport",     { 2, "", UNKNOWN,               0x00} }, /*write-port?*/

  {"wtod",      { 2, "", UNKNOWN,               0x00} }, /*write-time-of-day?*/

  {"flic",      { 2, "", UNKNOWN,               0x00} },

  {"iglob",     { 2, "", UNKNOWN,               0x00} }, /* I global? */

  {"iphys",     { 2, "", UNKNOWN,               0x00} }, /* I physical? */

  {"ipid",      { 2, "", UNKNOWN,               0x00} }, /* I pid? */

  {"ivect",     { 2, "", UNKNOWN,               0x00} }, /* I vector? */

  {"lamst",     { 2, "", UNKNOWN,               0x00} },

  {"tio",       { 2, "", UNKNOWN,               0x00} },

#endif