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-rw-r--r--opcodes/ChangeLog15
-rw-r--r--opcodes/i386-dis.c244
2 files changed, 245 insertions, 14 deletions
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 1322bf7..6499aea 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,18 @@
+2006-11-09 H.J. Lu <hongjiu.lu@intel.com>
+
+ * i386-dis.c (twobyte_uses_SSE_prefix): Renamed to ...
+ (twobyte_uses_DATA_prefix): This.
+ (twobyte_uses_REPNZ_prefix): New.
+ (twobyte_uses_REPZ_prefix): Likewise.
+ (threebyte_0x38_uses_DATA_prefix): Likewise.
+ (threebyte_0x38_uses_REPNZ_prefix): Likewise.
+ (threebyte_0x38_uses_REPZ_prefix): Likewise.
+ (threebyte_0x3a_uses_DATA_prefix): Likewise.
+ (threebyte_0x3a_uses_REPNZ_prefix): Likewise.
+ (threebyte_0x3a_uses_REPZ_prefix): Likewise.
+ (print_insn): Updated checking usages of DATA/REPNZ/REPZ
+ prefixes.
+
2006-11-06 Troy Rollo <troy@corvu.com.au>
* ppc-opc.c: Restore COM to mfcr wrongly removed 2003-07-04.
diff --git a/opcodes/i386-dis.c b/opcodes/i386-dis.c
index c1e67c4..0da2446 100644
--- a/opcodes/i386-dis.c
+++ b/opcodes/i386-dis.c
@@ -1158,7 +1158,7 @@ static const unsigned char twobyte_has_modrm[256] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
};
-static const unsigned char twobyte_uses_SSE_prefix[256] = {
+static const unsigned char twobyte_uses_DATA_prefix[256] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
/* ------------------------------- */
/* 00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0f */
@@ -1181,6 +1181,196 @@ static const unsigned char twobyte_uses_SSE_prefix[256] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
};
+static const unsigned char twobyte_uses_REPNZ_prefix[256] = {
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+ /* ------------------------------- */
+ /* 00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0f */
+ /* 10 */ 1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 1f */
+ /* 20 */ 0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0, /* 2f */
+ /* 30 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 3f */
+ /* 40 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 4f */
+ /* 50 */ 0,1,0,0,0,0,0,0,1,1,1,0,1,1,1,1, /* 5f */
+ /* 60 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 6f */
+ /* 70 */ 1,0,0,0,0,0,0,0,1,1,0,0,1,1,0,0, /* 7f */
+ /* 80 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 8f */
+ /* 90 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 9f */
+ /* a0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* af */
+ /* b0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* bf */
+ /* c0 */ 0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0, /* cf */
+ /* d0 */ 1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0, /* df */
+ /* e0 */ 0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0, /* ef */
+ /* f0 */ 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ff */
+ /* ------------------------------- */
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+};
+
+static const unsigned char twobyte_uses_REPZ_prefix[256] = {
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+ /* ------------------------------- */
+ /* 00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0f */
+ /* 10 */ 1,1,1,0,0,0,1,0,0,0,0,0,0,0,0,0, /* 1f */
+ /* 20 */ 0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0, /* 2f */
+ /* 30 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 3f */
+ /* 40 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 4f */
+ /* 50 */ 0,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1, /* 5f */
+ /* 60 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, /* 6f */
+ /* 70 */ 1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1, /* 7f */
+ /* 80 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 8f */
+ /* 90 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 9f */
+ /* a0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* af */
+ /* b0 */ 0,0,0,0,0,0,0,0,1,0,0,0,0,1,0,0, /* bf */
+ /* c0 */ 0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0, /* cf */
+ /* d0 */ 0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0, /* df */
+ /* e0 */ 0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0, /* ef */
+ /* f0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ff */
+ /* ------------------------------- */
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+};
+
+/* This is used to determine if opcode 0f 38 XX uses DATA prefix. */
+static const unsigned char threebyte_0x38_uses_DATA_prefix[256] = {
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+ /* ------------------------------- */
+ /* 00 */ 1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0, /* 0f */
+ /* 10 */ 0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0, /* 1f */
+ /* 20 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 2f */
+ /* 30 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 3f */
+ /* 40 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 4f */
+ /* 50 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 5f */
+ /* 60 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 6f */
+ /* 70 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 7f */
+ /* 80 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 8f */
+ /* 90 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 9f */
+ /* a0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* af */
+ /* b0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* bf */
+ /* c0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* cf */
+ /* d0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* df */
+ /* e0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ef */
+ /* f0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ff */
+ /* ------------------------------- */
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+};
+
+/* This is used to determine if opcode 0f 38 XX uses REPNZ prefix. */
+static const unsigned char threebyte_0x38_uses_REPNZ_prefix[256] = {
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+ /* ------------------------------- */
+ /* 00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0f */
+ /* 10 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 1f */
+ /* 20 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 2f */
+ /* 30 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 3f */
+ /* 40 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 4f */
+ /* 50 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 5f */
+ /* 60 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 6f */
+ /* 70 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 7f */
+ /* 80 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 8f */
+ /* 90 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 9f */
+ /* a0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* af */
+ /* b0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* bf */
+ /* c0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* cf */
+ /* d0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* df */
+ /* e0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ef */
+ /* f0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ff */
+ /* ------------------------------- */
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+};
+
+/* This is used to determine if opcode 0f 38 XX uses REPZ prefix. */
+static const unsigned char threebyte_0x38_uses_REPZ_prefix[256] = {
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+ /* ------------------------------- */
+ /* 00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0f */
+ /* 10 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 1f */
+ /* 20 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 2f */
+ /* 30 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 3f */
+ /* 40 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 4f */
+ /* 50 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 5f */
+ /* 60 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 6f */
+ /* 70 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 7f */
+ /* 80 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 8f */
+ /* 90 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 9f */
+ /* a0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* af */
+ /* b0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* bf */
+ /* c0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* cf */
+ /* d0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* df */
+ /* e0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ef */
+ /* f0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ff */
+ /* ------------------------------- */
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+};
+
+/* This is used to determine if opcode 0f 3a XX uses DATA prefix. */
+static const unsigned char threebyte_0x3a_uses_DATA_prefix[256] = {
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+ /* ------------------------------- */
+ /* 00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, /* 0f */
+ /* 10 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 1f */
+ /* 20 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 2f */
+ /* 30 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 3f */
+ /* 40 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 4f */
+ /* 50 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 5f */
+ /* 60 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 6f */
+ /* 70 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 7f */
+ /* 80 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 8f */
+ /* 90 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 9f */
+ /* a0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* af */
+ /* b0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* bf */
+ /* c0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* cf */
+ /* d0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* df */
+ /* e0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ef */
+ /* f0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ff */
+ /* ------------------------------- */
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+};
+
+/* This is used to determine if opcode 0f 3a XX uses REPNZ prefix. */
+static const unsigned char threebyte_0x3a_uses_REPNZ_prefix[256] = {
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+ /* ------------------------------- */
+ /* 00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0f */
+ /* 10 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 1f */
+ /* 20 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 2f */
+ /* 30 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 3f */
+ /* 40 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 4f */
+ /* 50 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 5f */
+ /* 60 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 6f */
+ /* 70 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 7f */
+ /* 80 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 8f */
+ /* 90 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 9f */
+ /* a0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* af */
+ /* b0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* bf */
+ /* c0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* cf */
+ /* d0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* df */
+ /* e0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ef */
+ /* f0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ff */
+ /* ------------------------------- */
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+};
+
+/* This is used to determine if opcode 0f 3a XX uses REPZ prefix. */
+static const unsigned char threebyte_0x3a_uses_REPZ_prefix[256] = {
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+ /* ------------------------------- */
+ /* 00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0f */
+ /* 10 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 1f */
+ /* 20 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 2f */
+ /* 30 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 3f */
+ /* 40 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 4f */
+ /* 50 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 5f */
+ /* 60 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 6f */
+ /* 70 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 7f */
+ /* 80 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 8f */
+ /* 90 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 9f */
+ /* a0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* af */
+ /* b0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* bf */
+ /* c0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* cf */
+ /* d0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* df */
+ /* e0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ef */
+ /* f0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ff */
+ /* ------------------------------- */
+ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
+};
+
static char obuf[100];
static char *obufp;
static char scratchbuf[100];
@@ -2649,10 +2839,12 @@ print_insn (bfd_vma pc, disassemble_info *info)
int i;
char *first, *second, *third, *fourth;
int needcomma;
- unsigned char uses_SSE_prefix, uses_LOCK_prefix;
+ unsigned char uses_DATA_prefix, uses_LOCK_prefix;
+ unsigned char uses_REPNZ_prefix, uses_REPZ_prefix;
int sizeflag;
const char *p;
struct dis_private priv;
+ unsigned char op;
if (info->mach == bfd_mach_x86_64_intel_syntax
|| info->mach == bfd_mach_x86_64)
@@ -2820,37 +3012,62 @@ print_insn (bfd_vma pc, disassemble_info *info)
return 1;
}
+ op = 0;
if (*codep == 0x0f)
{
+ unsigned char threebyte;
FETCH_DATA (info, codep + 2);
- dp = &dis386_twobyte[*++codep];
+ threebyte = *++codep;
+ dp = &dis386_twobyte[threebyte];
need_modrm = twobyte_has_modrm[*codep];
- uses_SSE_prefix = twobyte_uses_SSE_prefix[*codep];
+ uses_DATA_prefix = twobyte_uses_DATA_prefix[*codep];
+ uses_REPNZ_prefix = twobyte_uses_REPNZ_prefix[*codep];
+ uses_REPZ_prefix = twobyte_uses_REPZ_prefix[*codep];
uses_LOCK_prefix = (*codep & ~0x02) == 0x20;
+ codep++;
+ if (dp->name == NULL && dp->bytemode1 == IS_3BYTE_OPCODE)
+ {
+ FETCH_DATA (info, codep + 2);
+ op = *codep++;
+ switch (threebyte)
+ {
+ case 0x38:
+ uses_DATA_prefix = threebyte_0x38_uses_DATA_prefix[op];
+ uses_REPNZ_prefix = threebyte_0x38_uses_REPNZ_prefix[op];
+ uses_REPZ_prefix = threebyte_0x38_uses_REPZ_prefix[op];
+ break;
+ case 0x3a:
+ uses_DATA_prefix = threebyte_0x3a_uses_DATA_prefix[op];
+ uses_REPNZ_prefix = threebyte_0x3a_uses_REPNZ_prefix[op];
+ uses_REPZ_prefix = threebyte_0x3a_uses_REPZ_prefix[op];
+ break;
+ default:
+ break;
+ }
+ }
}
else
{
dp = &dis386[*codep];
need_modrm = onebyte_has_modrm[*codep];
- uses_SSE_prefix = 0;
+ uses_DATA_prefix = 0;
+ uses_REPNZ_prefix = 0;
+ uses_REPZ_prefix = 0;
uses_LOCK_prefix = 0;
+ codep++;
}
- /*"lzcnt"=0xBD and "popcnt"=0xB8 are the only two non-sse
- instruction which uses F3 in the opcode without any "rep(z|nz)"*/
- if (!uses_SSE_prefix && (prefixes & PREFIX_REPZ) && *codep != 0xBD && *codep != 0xB8)
+ if (!uses_REPZ_prefix && (prefixes & PREFIX_REPZ))
{
oappend ("repz ");
used_prefixes |= PREFIX_REPZ;
}
- if (!uses_SSE_prefix && (prefixes & PREFIX_REPNZ) && *codep != 0xBD && *codep != 0xB8)
+ if (!uses_REPNZ_prefix && (prefixes & PREFIX_REPNZ))
{
oappend ("repnz ");
used_prefixes |= PREFIX_REPNZ;
}
- codep++;
-
if (!uses_LOCK_prefix && (prefixes & PREFIX_LOCK))
{
oappend ("lock ");
@@ -2870,7 +3087,7 @@ print_insn (bfd_vma pc, disassemble_info *info)
}
}
- if (!uses_SSE_prefix && (prefixes & PREFIX_DATA))
+ if (!uses_DATA_prefix && (prefixes & PREFIX_DATA))
{
sizeflag ^= DFLAG;
if (dp->bytemode3 == cond_jump_mode
@@ -2887,8 +3104,7 @@ print_insn (bfd_vma pc, disassemble_info *info)
if (dp->name == NULL && dp->bytemode1 == IS_3BYTE_OPCODE)
{
- FETCH_DATA (info, codep + 2);
- dp = &three_byte_table[dp->bytemode2][*codep++];
+ dp = &three_byte_table[dp->bytemode2][op];
mod = (*codep >> 6) & 3;
reg = (*codep >> 3) & 7;
rm = *codep & 7;