/* tic80.h -- Header file for TI TMS320C80 (MV) opcode table
- Copyright 1996 Free Software Foundation, Inc.
+ Copyright 1996, 1997 Free Software Foundation, Inc.
Written by Fred Fish (fnf@cygnus.com), Cygnus Support
- using other opcode/*.h files as templates.
This file is part of GDB, GAS, and the GNU binutils.
#ifndef TIC80_H
#define TIC80_H
-/* The opcode table is an array of struct TIc80_opcode. */
+/* The opcode table is an array of struct tic80_opcode. */
-struct TIc80_opcode
+struct tic80_opcode
{
/* The opcode name. */
+
const char *name;
- /* The opcode itself. Those bits which will be filled in with
- operands are zeroes. */
+ /* The opcode itself. Those bits which will be filled in with operands
+ are zeroes. */
+
unsigned long 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). */
+ /* 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 long mask;
- /* The format of this opcode. */
+ /* The format of this opcode. I.E. short-immediate, register, long
+ immediate, etc. FIXME: Will this ever be used? */
+
unsigned char format;
- /* 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. */
+ /* 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. FIXME: Adjust size to
+ match actual requirements when TIc80 support is complete */
+
unsigned char operands[8];
};
-/* The table itself is sorted by major opcode number, and is otherwise
- in the order in which the disassembler should consider
- instructions. */
+/* The table itself is sorted by major opcode number, and is otherwise in
+ the order in which the disassembler should consider instructions.
+ FIXME: This isn't currently true. */
+
extern const struct tic80_opcode tic80_opcodes[];
extern const int tic80_num_opcodes;
struct tic80_operand
{
/* The number of bits in the operand. */
+
int bits;
/* How far the operand is left shifted in the instruction. */
+
int shift;
+ /* 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 long (*insert) PARAMS ((unsigned long instruction, long 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 & PPC_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. */
+
+ long (*extract) PARAMS ((unsigned long instruction, int *invalid));
+
/* One bit syntax flags. */
- int flags;
+
+ unsigned long flags;
};
/* Elements in the table are retrieved by indexing with values from
extern const struct tic80_operand tic80_operands[];
/* Values defined for the flags field of a struct tic80_operand. */
-#define TIC80_OPERAND_DREG 0x1
-
-#define TIC80_OPERAND_AREG 0x2
-
-#define TIC80_OPERAND_PSW 0x4
-
-#define TIC80_OPERAND_MDR 0x8
-
-#define TIC80_OPERAND_SIGNED 0x10
-
-#define TIC80_OPERAND_PROMOTE 0x20
-
-#define TIC80_OPERAND_PAREN 0x40
-
-#define TIC80_OPERAND_REPEATED 0x80
-
-#define TIC80_OPERAND_EXTENDED 0x100
-
-#define TIC80_OPERAND_PCREL 0x400
-
-#define TIC80_OPERAND_MEMADDR 0x800
-#define FMT_1 1
-#define FMT_2 2
-#define FMT_3 3
-#define FMT_4 4
-#define FMT_5 5
-#define FMT_6 6
-#define FMT_7 7
+/* This operand takes signed values. */
+#define TIC80_OPERAND_SIGNED (01)
+
+/* The next operand should be wrapped in parentheses rather than separated
+ from this one by a comma. This is used for various instructions, like
+ the load and store instructions, which want their operands to look like
+ "displacement(reg)" */
+#define TIC80_OPERAND_PARENS (02)
+
+/* This operand may use the symbolic names for the condition and size
+ codes that the branch instructions use, such as "eq.b", "or.f",
+ etc. */
+#define TIC80_OPERAND_CC_SZ (04)
+
+/* This operand names a register. The disassembler uses this to print
+ register names with a leading 'r'. */
+#define TIC80_OPERAND_GPR (010)
+
+/* This operand names a floating point accumulator register. The disassembler
+ prints these with a leading 'a'. */
+#define TIC80_OPERAND_FPA (020)
+
+/* This operand is a relative branch displacement. The disassembler
+ prints these symbolically if possible. */
+#define TIC80_OPERAND_RELATIVE (040)
+
+/* This flag is a hint to the disassembler for using hex as the prefered
+ printing format, even for small positive or negative immediate values.
+ Normally values in the range -999 to 999 are printed as signed decimal
+ values and other values are printed in hex. */
+#define TIC80_OPERAND_BITFIELD (0100)
+
+/* Values which go in the struct tic80_opcode format field to distinguish
+ between various types of instructions with the same mnemonic. FIXME: Not
+ currently used? */
+
+#define FMT_UNUSED 0 /* Unused */
+#define FMT_SI 1 /* Short immediate format */
+#define FMT_LI 2 /* Long immediate format */
+#define FMT_REG 3 /* Register format */
#endif /* TIC80_H */
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