Author: cem
Date: Wed Oct 16 18:27:27 2019
New Revision: 353662
URL: https://svnweb.freebsd.org/changeset/base/353662
Log:
ddb: Add support for disassembling 'crc32' on amd64
Modified:
head/sys/amd64/amd64/db_disasm.c
Modified: head/sys/amd64/amd64/db_disasm.c
==============================================================================
--- head/sys/amd64/amd64/db_disasm.c Wed Oct 16 18:12:22 2019
(r353661)
+++ head/sys/amd64/amd64/db_disasm.c Wed Oct 16 18:27:27 2019
(r353662)
@@ -145,6 +145,26 @@ static const struct inst db_inst_0f388x[] = {
/*8f*/ { "", FALSE, NONE, 0, 0 },
};
+static const struct inst db_inst_0f38fx[] = {
+/*f0*/ { "crc32b",TRUE, NONE, op2(Eb, R), 0 },
+/*f1*/ { "crc32", TRUE, LONG, op2(E, R), 0 },
+/*f2*/ { "", FALSE, NONE, 0, 0 },
+/*f3*/ { "", FALSE, NONE, 0, 0 },
+/*f4*/ { "", FALSE, NONE, 0, 0 },
+/*f5*/ { "", FALSE, NONE, 0, 0 },
+/*f6*/ { "", FALSE, NONE, 0, 0 },
+/*f7*/ { "", FALSE, NONE, 0, 0 },
+
+/*f8*/ { "", FALSE, NONE, 0, 0 },
+/*f9*/ { "", FALSE, NONE, 0, 0 },
+/*fa*/ { "", FALSE, NONE, 0, 0 },
+/*fb*/ { "", FALSE, NONE, 0, 0 },
+/*fc*/ { "", FALSE, NONE, 0, 0 },
+/*fd*/ { "", FALSE, NONE, 0, 0 },
+/*fe*/ { "", FALSE, NONE, 0, 0 },
+/*ff*/ { "", FALSE, NONE, 0, 0 },
+};
+
static const struct inst * const db_inst_0f38[] = {
0,
0,
@@ -161,7 +181,7 @@ static const struct inst * const db_inst_0f38[] = {
0,
0,
0,
- 0
+ db_inst_0f38fx
};
static const char * const db_Grp6[] = {
@@ -1238,7 +1258,7 @@ db_disasm(db_addr_t loc, bool altfmt)
boolean_t first;
int displ;
int prefix;
- int rep;
+ int rep, repne;
int imm;
int imm2;
long imm64;
@@ -1254,6 +1274,7 @@ db_disasm(db_addr_t loc, bool altfmt)
* Get prefixes
*/
rep = FALSE;
+ repne = FALSE;
prefix = TRUE;
do {
switch (inst) {
@@ -1284,8 +1305,12 @@ db_disasm(db_addr_t loc, bool altfmt)
case 0xf0:
db_printf("lock ");
break;
+ /*
+ * XXX repne/repe are only actually valid for MOVS, CMPS,
+ * SCAS, LODS, STOS, INS, OUTS.
+ */
case 0xf2:
- db_printf("repne ");
+ repne = TRUE;
break;
case 0xf3:
rep = TRUE;
@@ -1480,6 +1505,11 @@ db_disasm(db_addr_t loc, bool altfmt)
rep = FALSE;
}
}
+ /* N.B., likely highly incomplete. */
+ if (repne) {
+ if (ip == &db_inst_0f38fx[0] || ip == &db_inst_0f38fx[1])
+ repne = FALSE;
+ }
if (size == WORD) {
if (ip->i_extra == db_Grp9 && f_mod(rex, regmodrm) != 3 &&
f_reg(rex, regmodrm) == 0x6) {
@@ -1495,6 +1525,8 @@ db_disasm(db_addr_t loc, bool altfmt)
if (rep == TRUE)
db_printf("repe "); /* XXX repe VS rep */
+ if (repne == TRUE)
+ db_printf("repne ");
if (i_size == SDEP) {
if (size == LONG)
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