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Diffstat (limited to 'include/alpha.h')
| -rw-r--r-- | include/alpha.h | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/include/alpha.h b/include/alpha.h new file mode 100644 index 0000000..22c85a1 --- /dev/null +++ b/include/alpha.h @@ -0,0 +1,237 @@ +/* alpha.h -- Header file for Alpha opcode table + Copyright 1996, 1999, 2001, 2003 Free Software Foundation, Inc. + Contributed by Richard Henderson <rth@tamu.edu>, + patterned after the PPC opcode table written by Ian Lance Taylor. + +This file is part of GDB, GAS, and the GNU binutils. + +GDB, GAS, and the GNU binutils are free software; you can redistribute +them and/or modify them under the terms of the GNU General Public +License as published by the Free Software Foundation; either version +1, or (at your option) any later version. + +GDB, GAS, and the GNU binutils are distributed in the hope that they +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 file; see the file COPYING. If not, write to the Free +Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ + +#ifndef OPCODE_ALPHA_H +#define OPCODE_ALPHA_H + +/* The opcode table is an array of struct alpha_opcode. */ + +struct alpha_opcode +{ + /* The opcode name. */ + const char *name; + + /* The opcode itself. Those bits which will be filled in with + operands are zeroes. */ + unsigned opcode; + + /* The opcode mask. This is used by the disassembler. This is a + mask containing ones indicating those bits which must match the + opcode field, and zeroes indicating those bits which need not + match (and are presumably filled in by operands). */ + unsigned mask; + + /* One bit flags for the opcode. These are primarily used to + indicate specific processors and environments support the + instructions. The defined values are listed below. */ + unsigned flags; + + /* An array of operand codes. Each code is an index into the + operand table. They appear in the order which the operands must + appear in assembly code, and are terminated by a zero. */ + unsigned char operands[4]; +}; + +/* The table itself is sorted by major opcode number, and is otherwise + in the order in which the disassembler should consider + instructions. */ +extern const struct alpha_opcode alpha_opcodes[]; +extern const unsigned alpha_num_opcodes; + +/* Values defined for the flags field of a struct alpha_opcode. */ + +/* CPU Availability */ +#define AXP_OPCODE_BASE 0x0001 /* Base architecture -- all cpus. */ +#define AXP_OPCODE_EV4 0x0002 /* EV4 specific PALcode insns. */ +#define AXP_OPCODE_EV5 0x0004 /* EV5 specific PALcode insns. */ +#define AXP_OPCODE_EV6 0x0008 /* EV6 specific PALcode insns. */ +#define AXP_OPCODE_BWX 0x0100 /* Byte/word extension (amask bit 0). */ +#define AXP_OPCODE_CIX 0x0200 /* "Count" extension (amask bit 1). */ +#define AXP_OPCODE_MAX 0x0400 /* Multimedia extension (amask bit 8). */ + +#define AXP_OPCODE_NOPAL (~(AXP_OPCODE_EV4|AXP_OPCODE_EV5|AXP_OPCODE_EV6)) + +/* A macro to extract the major opcode from an instruction. */ +#define AXP_OP(i) (((i) >> 26) & 0x3F) + +/* The total number of major opcodes. */ +#define AXP_NOPS 0x40 + + +/* The operands table is an array of struct alpha_operand. */ + +struct alpha_operand +{ + /* The number of bits in the operand. */ + unsigned int bits : 5; + + /* How far the operand is left shifted in the instruction. */ + unsigned int shift : 5; + + /* The default relocation type for this operand. */ + signed int default_reloc : 16; + + /* One bit syntax flags. */ + unsigned int flags : 16; + + /* Insertion function. This is used by the assembler. To insert an + operand value into an instruction, check this field. + + If it is NULL, execute + i |= (op & ((1 << o->bits) - 1)) << o->shift; + (i is the instruction which we are filling in, o is a pointer to + this structure, and op is the opcode value; this assumes twos + complement arithmetic). + + If this field is not NULL, then simply call it with the + instruction and the operand value. It will return the new value + of the instruction. If the ERRMSG argument is not NULL, then if + the operand value is illegal, *ERRMSG will be set to a warning + string (the operand will be inserted in any case). If the + operand value is legal, *ERRMSG will be unchanged (most operands + can accept any value). */ + unsigned (*insert) (unsigned instruction, int op, const char **errmsg); + + /* Extraction function. This is used by the disassembler. To + extract this operand type from an instruction, check this field. + + If it is NULL, compute + op = ((i) >> o->shift) & ((1 << o->bits) - 1); + if ((o->flags & AXP_OPERAND_SIGNED) != 0 + && (op & (1 << (o->bits - 1))) != 0) + op -= 1 << o->bits; + (i is the instruction, o is a pointer to this structure, and op + is the result; this assumes twos complement arithmetic). + + If this field is not NULL, then simply call it with the + instruction value. It will return the value of the operand. If + the INVALID argument is not NULL, *INVALID will be set to + non-zero if this operand type can not actually be extracted from + this operand (i.e., the instruction does not match). If the + operand is valid, *INVALID will not be changed. */ + int (*extract) (unsigned instruction, int *invalid); +}; + +/* Elements in the table are retrieved by indexing with values from + the operands field of the alpha_opcodes table. */ + +extern const struct alpha_operand alpha_operands[]; +extern const unsigned alpha_num_operands; + +/* Values defined for the flags field of a struct alpha_operand. */ + +/* Mask for selecting the type for typecheck purposes */ +#define AXP_OPERAND_TYPECHECK_MASK \ + (AXP_OPERAND_PARENS | AXP_OPERAND_COMMA | AXP_OPERAND_IR | \ + AXP_OPERAND_FPR | AXP_OPERAND_RELATIVE | AXP_OPERAND_SIGNED | \ + AXP_OPERAND_UNSIGNED) + +/* This operand does not actually exist in the assembler input. This + is used to support extended mnemonics, for which two operands fields + are identical. The assembler should call the insert function with + any op value. The disassembler should call the extract function, + ignore the return value, and check the value placed in the invalid + argument. */ +#define AXP_OPERAND_FAKE 01 + +/* The operand should be wrapped in parentheses rather than separated + from the previous by a comma. This is used for the load and store + instructions which want their operands to look like "Ra,disp(Rb)". */ +#define AXP_OPERAND_PARENS 02 + +/* Used in combination with PARENS, this supresses the supression of + the comma. This is used for "jmp Ra,(Rb),hint". */ +#define AXP_OPERAND_COMMA 04 + +/* This operand names an integer register. */ +#define AXP_OPERAND_IR 010 + +/* This operand names a floating point register. */ +#define AXP_OPERAND_FPR 020 + +/* This operand is a relative branch displacement. The disassembler + prints these symbolically if possible. */ +#define AXP_OPERAND_RELATIVE 040 + +/* This operand takes signed values. */ +#define AXP_OPERAND_SIGNED 0100 + +/* This operand takes unsigned values. This exists primarily so that + a flags value of 0 can be treated as end-of-arguments. */ +#define AXP_OPERAND_UNSIGNED 0200 + +/* Supress overflow detection on this field. This is used for hints. */ +#define AXP_OPERAND_NOOVERFLOW 0400 + +/* Mask for optional argument default value. */ +#define AXP_OPERAND_OPTIONAL_MASK 07000 + +/* This operand defaults to zero. This is used for jump hints. */ +#define AXP_OPERAND_DEFAULT_ZERO 01000 + +/* This operand should default to the first (real) operand and is used + in conjunction with AXP_OPERAND_OPTIONAL. This allows + "and $0,3,$0" to be written as "and $0,3", etc. I don't like + it, but it's what DEC does. */ +#define AXP_OPERAND_DEFAULT_FIRST 02000 + +/* Similarly, this operand should default to the second (real) operand. + This allows "negl $0" instead of "negl $0,$0". */ +#define AXP_OPERAND_DEFAULT_SECOND 04000 + + +/* Register common names */ + +#define AXP_REG_V0 0 +#define AXP_REG_T0 1 +#define AXP_REG_T1 2 +#define AXP_REG_T2 3 +#define AXP_REG_T3 4 +#define AXP_REG_T4 5 +#define AXP_REG_T5 6 +#define AXP_REG_T6 7 +#define AXP_REG_T7 8 +#define AXP_REG_S0 9 +#define AXP_REG_S1 10 +#define AXP_REG_S2 11 +#define AXP_REG_S3 12 +#define AXP_REG_S4 13 +#define AXP_REG_S5 14 +#define AXP_REG_FP 15 +#define AXP_REG_A0 16 +#define AXP_REG_A1 17 +#define AXP_REG_A2 18 +#define AXP_REG_A3 19 +#define AXP_REG_A4 20 +#define AXP_REG_A5 21 +#define AXP_REG_T8 22 +#define AXP_REG_T9 23 +#define AXP_REG_T10 24 +#define AXP_REG_T11 25 +#define AXP_REG_RA 26 +#define AXP_REG_PV 27 +#define AXP_REG_T12 27 +#define AXP_REG_AT 28 +#define AXP_REG_GP 29 +#define AXP_REG_SP 30 +#define AXP_REG_ZERO 31 + +#endif /* OPCODE_ALPHA_H */ |