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* v850.h (v850_operands): Add insert and extract fields, pointers

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to functions used to handle unusual operand encoding.
(V850_OPERAND_REG, V850_OPERAND_SRG, V850_OPERAND_CC,
V850_OPERAND_SIGNED): Defined.
This commit is contained in:
J.T. Conklin 1996-08-22 23:56:25 +00:00
parent 40484384a7
commit 27021dd459
2 changed files with 56 additions and 2 deletions
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7
include/opcode/ChangeLog
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@ -1,4 +1,11 @@
start-sanitize-v850
Thu Aug 22 16:51:25 1996 J.T. Conklin <jtc@rtl.cygnus.com>
* v850.h (v850_operands): Add insert and extract fields, pointers
to functions used to handle unusual operand encoding.
(V850_OPERAND_REG, V850_OPERAND_SRG, V850_OPERAND_CC,
V850_OPERAND_SIGNED): Defined.
Wed Aug 21 17:45:10 1996 J.T. Conklin <jtc@rtl.cygnus.com>
* v850.h (v850_operands): Add flags field.

51
include/opcode/v850.h
View File

@ -61,6 +61,45 @@ struct v850_operand
/* 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;
};
@ -70,9 +109,17 @@ struct v850_operand
extern const struct v850_operand v850_operands[];
/* Values defined for the flags field of a struct v850_operand. */
#define OPERAND_NUM 1 /* number or symbol */
#define OPERAND_REG 2 /* register */
/* This operand names a general purpose register */
#define V850_OPERAND_REG 0x01
/* This operand names a system register */
#define V850_OPERAND_SRG 0x02
/* This operand names a condition code used in the setf instruction */
#define V850_OPERAND_CC 0x04
/* This operand takes signed values */
#define V850_OPERAND_SIGNED 0x08
#endif /* V850_H */