New header file for PowerPC opcode table.
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Ian Lance Taylor
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include/opcode/ppc.h
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196
include/opcode/ppc.h
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/* ppc.h -- Header file for PowerPC opcode table
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Copyright 1994 Free Software Foundation, Inc.
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Written by Ian Lance Taylor, Cygnus Support
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This file is part of GDB, GAS, and the GNU binutils.
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GDB, GAS, and the GNU binutils are free software; you can redistribute
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them and/or modify them under the terms of the GNU General Public
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License as published by the Free Software Foundation; either version
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1, or (at your option) any later version.
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GDB, GAS, and the GNU binutils are distributed in the hope that they
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will be useful, but WITHOUT ANY WARRANTY; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this file; see the file COPYING. If not, write to the Free
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Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifndef PPC_H
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#define PPC_H
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/* The opcode table is an array of struct powerpc_opcode. */
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struct powerpc_opcode
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{
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/* The opcode name. */
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const char *name;
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/* The opcode itself. Those bits which will be filled in with
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operands are zeroes. */
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unsigned long opcode;
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/* The opcode mask. This is used by the disassembler. This is a
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mask containing ones indicating those bits which must match the
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opcode field, and zeroes indicating those bits which need not
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match (and are presumably filled in by operands). */
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unsigned long mask;
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/* One bit flags for the opcode. These are used to indicate which
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specific processors support the instructions. The defined values
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are listed below. */
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unsigned long flags;
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/* An array of operand codes. Each code is an index into the
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operand table. They appear in the order which the operands must
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appear in assembly code, and are terminated by a zero. */
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char operands[8];
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};
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/* The table itself is sorted by major opcode number, and is otherwise
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in the order in which the disassembler should consider
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instructions. */
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extern const struct powerpc_opcode powerpc_opcodes[];
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extern const int powerpc_num_opcodes;
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/* Values defined for the flags field of a struct powerpc_opcode. */
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/* Opcode is defined for the PowerPC architecture. */
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#define PPC_OPCODE_PPC (01)
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/* Opcode is defined for the POWER (RS/6000) architecture. */
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#define PPC_OPCODE_POWER (02)
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/* Opcode is defined for the POWER2 (Rios 2) architecture. */
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#define PPC_OPCODE_POWER2 (04)
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/* Opcode is only defined on 32 bit architectures. */
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#define PPC_OPCODE_32 (010)
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/* Opcode is only defined on 64 bit architectures. */
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#define PPC_OPCODE_64 (020)
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/* A macro to extract the major opcode from an instruction. */
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#define PPC_OP(i) (((i) >> 26) & 0x3f)
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/* The operands table is an array of struct powerpc_operand. */
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struct powerpc_operand
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{
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/* The number of bits in the operand. */
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int bits;
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/* How far the operand is left shifted in the instruction. */
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int shift;
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/* Non zero if the operand is signed (this is zero for most
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operands). */
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int signedp;
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/* Insertion function. This is used by the assembler. To insert an
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operand value into an instruction, check this field.
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If it is NULL, execute
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i |= (op & ((1 << o->bits) - 1)) << o->shift;
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(i is the instruction which we are filling in, o is a pointer to
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this structure, and op is the opcode value; this assumes twos
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complement arithmetic).
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If this field is not NULL, then simply call it with the
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instruction and the operand value. It will return the new value
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of the instruction. If the ERRMSG argument is not NULL, then if
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the operand value is illegal, *ERRMSG will be set to a warning
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string (the operand will be inserted in any case). If the
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operand value is legal, *ERRMSG will be unchanged (most operands
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can accept any value). */
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unsigned long (*insert) PARAMS ((unsigned long instruction, long op,
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const char **errmsg));
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/* Extraction function. This is used by the disassembler. To
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extract this operand type from an instruction, check this field.
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If it is NULL, compute
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op = ((i) >> o->shift) & ((1 << o->bits) - 1);
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if (o->signedp
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&& (op & (1 << (o->bits - 1))) != 0)
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op -= 1 << o->bits;
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(i is the instruction, o is a pointer to this structure, and op
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is the result; this assumes twos complement arithmetic).
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If this field is not NULL, then simply call it with the
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instruction value. It will return the value of the operand. If
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the INVALID argument is not NULL, *INVALID will be set to
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non-zero if this operand type can not actually be extracted from
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this operand (i.e., the instruction does not match). If the
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operand is valid, *INVALID will not be changed. */
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long (*extract) PARAMS ((unsigned long instruction, int *invalid));
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/* One bit syntax flags. */
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unsigned long flags;
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};
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/* Elements in the table are retrieved by indexing with values from
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the operands field of the powerpc_opcodes table. */
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extern const struct powerpc_operand powerpc_operands[];
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/* Values defined for the flags field of a struct powerpc_operand. */
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/* This operand does not actually exist in the assembler input. This
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is used to support extended mnemonics such as mr, for which two
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operands fields are identical. The assembler should call the
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insert function with any op value. The disassembler should call
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the extract function, ignore the return value, and check the value
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placed in the valid argument. */
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#define PPC_OPERAND_FAKE (01)
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/* The next operand should be wrapped in parentheses rather than
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separated from this one by a comma. This is used for the load and
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store instructions which want their operands to look like
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reg,displacement(reg)
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*/
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#define PPC_OPERAND_PARENS (02)
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/* This operand may use the symbolic names for the CR fields, which
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are
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lt 0 gt 1 eq 2 so 3 un 3
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cr0 0 cr1 1 cr2 2 cr3 3
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cr4 4 cr5 5 cr6 6 cr7 7
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These may be combined arithmetically, as in cr2*4+gt. These are
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only supported on the PowerPC, not the POWER. */
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#define PPC_OPERAND_CR (04)
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/* This operand names a register. The disassembler uses this to print
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register names with a leading 'r'. */
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#define PPC_OPERAND_GPR (010)
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/* This operand names a floating point register. The disassembler
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prints these with a leading 'f'. */
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#define PPC_OPERAND_FPR (020)
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/* This operand is a relative branch displacement. The disassembler
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prints these symbolically if possible. */
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#define PPC_OPERAND_RELATIVE (0100)
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/* This operand is an absolute branch address. The disassembler
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prints these symbolically if possible. */
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#define PPC_OPERAND_ABSOLUTE (0200)
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/* This operand is optional, and is zero if omitted. This is used for
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the optional BF and L fields in the comparison instructions. The
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assembler must count the number of operands remaining on the line,
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and the number of operands remaining for the opcode, and decide
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whether this operand is present or not. The disassembler should
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print this operand out only if it is not zero. */
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#define PPC_OPERAND_OPTIONAL (0400)
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/* This operand should be regarded as a negative number for the
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purposes of overflow checking (i.e., the normal most negative
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number is disallowed and one more than the normal most positive
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number is allowed). This flag will only be set for a signed
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operand. */
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#define PPC_OPERAND_NEGATIVE (01000)
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#endif /* PPC_H */
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