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Added Enhanced DSP Extension STRD and LRDD instructions.

This commit is contained in:
masscat 2007-05-01 13:53:07 +00:00
parent 131d6a3b19
commit ba8dcdfde2
1 changed files with 73 additions and 0 deletions
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73
desmume/src/Disassembler.c
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@ -3192,6 +3192,79 @@ static char * OP_LDC_OPTION(u32 adr, u32 i, char * txt)
return txt;
}
/*
*
* The Enhanced DSP Extension LDRD and STRD instructions.
*
*/
static char *
OP_LDRD_STRD_POST_INDEX(u32 adr, u32 i, char * txt) {
const char *direction =
BIT5(i) ? "STR" : "LDR";
/* U bit - set = add, clear = sub */
char sign = BIT23(i) ? '+' : '-';
int txt_index = 0;
txt_index += sprintf( &txt[txt_index], "%s%sD R%d, [R%d], ",
direction, Condition[CONDITION(i)],
(int)REG_POS(i, 12),
(int)REG_POS(i, 16));
/* I bit - set = immediate, clear = reg */
if ( BIT22(i)) {
sprintf( &txt[txt_index], "#%c%d",
sign, (int)(((i>>4) & 0xF0) | (i&0xF)) );
}
else {
sprintf( &txt[txt_index], "%cR%d",
sign, (int)REG_POS(i, 0));
}
return txt;
}
static char *
OP_LDRD_STRD_OFFSET_PRE_INDEX(u32 adr, u32 i, char * txt) {
const char *direction =
BIT5(i) ? "STR" : "LDR";
/* U bit - set = add, clear = sub */
char sign = BIT23(i) ? '+' : '-';
int txt_index = 0;
txt_index += sprintf( &txt[txt_index], "%s%sD R%d, [R%d, ",
direction, Condition[CONDITION(i)],
(int)REG_POS(i, 12),
(int)REG_POS(i, 16));
/* I bit - set = immediate, clear = reg */
if ( BIT22(i)) {
if ( BIT21(i)) {
/* pre-index */
sprintf( &txt[txt_index], "#%c%d]!",
sign, (int)(((i>>4)&0xF0)|(i&0xF)));
}
else {
/* offset */
sprintf( &txt[txt_index], "#%c%d]",
sign, (int)(((i>>4)&0xF0)|(i&0xF)));
}
}
else {
if ( BIT21(i)) {
/* pre-index */
sprintf( &txt[txt_index], "%c%d]!",
sign, (int)REG_POS(i, 0));
}
else {
/* offset */
sprintf( &txt[txt_index], "%c%d]",
sign, (int)REG_POS(i, 0));
}
}
return txt;
}
//----------------MCR-----------------------
static char * OP_MCR(u32 adr, u32 i, char * txt)