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start writing functions for extracting and inserting unusual operands

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This commit is contained in:
J.T. Conklin 1996-08-23 02:35:16 +00:00
parent 271fef259a
commit 4f23511029
1 changed files with 37 additions and 6 deletions
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43
opcodes/v850-opc.c
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@ -1,6 +1,10 @@
#include "ansidecl.h"
#include "opcode/v850.h"
/* Local insertion and extraction functions. */
static unsigned long insert_d9 PARAMS ((unsigned long, long, const char **));
static long extract_d9 PARAMS ((unsigned long, int *));
/* regular opcode */
#define OP(x) ((x & 0x3f) << 5)
#define OP_MASK OP(0x3f)
@ -33,7 +37,7 @@ const struct v850_operand v850_operands[] = {
#define I5 (R2+1)
{ 5, 0, 0, 0, 0 },
#define IMM16 field in a format 6 insn. */
/* The IMM16 field in a format 6 insn. */
#define I16 (I5+1)
{ 16, 0, 0, 0, 0 },
@ -41,12 +45,12 @@ const struct v850_operand v850_operands[] = {
#define D6 (I16+1)
{ 6, 1, 0, 0, 0 },
/* The DISP8 field in a format 3 insn. */
#define D8 (D6+1)
{ 9, 0, 0, 0, 0 },
/* The DISP9 field in a format 3 insn. */
#define D9 (D6+1)
{ 0, 0, insert_d9, extract_d9, 0 },
/* The DISP16 field in a format 6 insn. */
#define D16 (D8+1)
#define D16 (D9+1)
{ 16, 0, 0, 0, 0 },
/* The DISP22 field in a format 4 insn. */
@ -70,7 +74,7 @@ const struct v850_operand v850_operands[] = {
#define IF2 {I5, R2}
/* conditional branch instruction format (Format III) */
#define IF3 {D8}
#define IF3 {D9}
/* 16-bit load/store instruction (Format IV) */
#define IF4A {D6, R2}
@ -215,3 +219,30 @@ const struct v850_opcode v850_opcodes[] = {
const int v850_num_opcodes =
sizeof (v850_opcodes) / sizeof (v850_opcodes[0]);
/* The functions used to insert and extract complicated operands. */
static unsigned long
insert_d9 (insn, value, errmsg)
unsigned long insn;
long value;
const char **errmsg;
{
if (value > 511 || value <= -512)
*errmsg = "value out of range";
return (insn | ((value & 0x1f0) << 7) | ((value & 0x0e) << 3));
}
static long
extract_d9 (insn, invalid)
unsigned long insn;
int *invalid;
{
long ret = ((insn & 0xf800) >> 7) | ((insn & 0x0070) >> 3);
if ((insn & 0x8000) != 0)
ret -= 0x0200;
return ret;
}