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Diffstat (limited to 'include/opcode/msp430.h')
-rw-r--r--include/opcode/msp430.h15
1 files changed, 10 insertions, 5 deletions
diff --git a/include/opcode/msp430.h b/include/opcode/msp430.h
index 110d7cf..463e5e6 100644
--- a/include/opcode/msp430.h
+++ b/include/opcode/msp430.h
@@ -35,7 +35,13 @@ struct msp430_operand_s
#endif
};
-#define BYTE_OPERATION (1 << 6) /* Byte operation flag for all instructions. */
+/* Byte operation flag for all instructions. Also used as the
+ A/L bit in the extension word to indicate a 20-bit operation. */
+#define BYTE_OPERATION (1 << 6)
+/* Z/C bit in the extension word. If set the carry bit is ignored
+ for the duration of the operation, although it may be changed as
+ a result of the operation. */
+#define IGNORE_CARRY_BIT (1 << 8)
struct msp430_opcode_s
{
@@ -46,7 +52,7 @@ struct msp430_opcode_s
int bin_mask;
};
-#define MSP_INSN(name, size, numb, bin, mask) { #name, size, numb, bin, mask }
+#define MSP_INSN(name, fmt, numb, bin, mask) { #name, fmt, numb, bin, mask }
static struct msp430_opcode_s msp430_opcodes[] =
{
@@ -156,7 +162,8 @@ static struct msp430_opcode_s msp430_opcodes[] =
MSP_INSN (pushx, -3, 1, 0x1200, 0xff80),
MSP_INSN (rrax, -3, 1, 0x1100, 0xff80),
- MSP_INSN (rrcx, -3, 1, 0x1000, 0xff80),
+ MSP_INSN (rrcx, -3, 1, 0x1000, 0xff80), /* Synthesised as RRC but with the Z/C bit clear. */
+ MSP_INSN (rrux, -3, 1, 0x1000, 0xff80), /* Synthesised as RRC but with the Z/C bit set. */
MSP_INSN (swpbx, -3, 1, 0x1080, 0xffc0),
MSP_INSN (sxtx, -3, 1, 0x1180, 0xffc0),
@@ -173,8 +180,6 @@ static struct msp430_opcode_s msp430_opcodes[] =
MSP_INSN (rlam, -1, 6, 0x0240, 0xf3e0),
MSP_INSN (rrum, -1, 6, 0x0340, 0xf3e0),
- MSP_INSN (rrux, -1, 7, 0x0340, 0xffe0), /* Synthesized in terms of RRUM. */
-
MSP_INSN (adda, -1, 8, 0x00a0, 0xf0b0),
MSP_INSN (cmpa, -1, 8, 0x0090, 0xf0b0),
MSP_INSN (suba, -1, 8, 0x00b0, 0xf0b0),