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ddb: Add support for disassembling 'crc32' on amd64

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This commit is contained in:
Conrad Meyer 2019-10-16 18:27:27 +00:00
parent 087ea4103c
commit f677fed5a2
1 changed files with 35 additions and 3 deletions
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38
sys/amd64/amd64/db_disasm.c
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@ -145,6 +145,26 @@ static const struct inst db_inst_0f388x[] = {
/*8f*/ { "", FALSE, NONE, 0, 0 }, /*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[] = { static const struct inst * const db_inst_0f38[] = {
0, 0,
0, 0,
@ -161,7 +181,7 @@ static const struct inst * const db_inst_0f38[] = {
0, 0,
0, 0,
0, 0,
0 db_inst_0f38fx
}; };
static const char * const db_Grp6[] = { static const char * const db_Grp6[] = {
@ -1238,7 +1258,7 @@ db_disasm(db_addr_t loc, bool altfmt)
boolean_t first; boolean_t first;
int displ; int displ;
int prefix; int prefix;
int rep; int rep, repne;
int imm; int imm;
int imm2; int imm2;
long imm64; long imm64;
@ -1254,6 +1274,7 @@ db_disasm(db_addr_t loc, bool altfmt)
* Get prefixes * Get prefixes
*/ */
rep = FALSE; rep = FALSE;
repne = FALSE;
prefix = TRUE; prefix = TRUE;
do { do {
switch (inst) { switch (inst) {
@ -1284,8 +1305,12 @@ db_disasm(db_addr_t loc, bool altfmt)
case 0xf0: case 0xf0:
db_printf("lock "); db_printf("lock ");
break; break;
/*
* XXX repne/repe are only actually valid for MOVS, CMPS,
* SCAS, LODS, STOS, INS, OUTS.
*/
case 0xf2: case 0xf2:
db_printf("repne "); repne = TRUE;
break; break;
case 0xf3: case 0xf3:
rep = TRUE; rep = TRUE;
@ -1480,6 +1505,11 @@ db_disasm(db_addr_t loc, bool altfmt)
rep = FALSE; 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 (size == WORD) {
if (ip->i_extra == db_Grp9 && f_mod(rex, regmodrm) != 3 && if (ip->i_extra == db_Grp9 && f_mod(rex, regmodrm) != 3 &&
f_reg(rex, regmodrm) == 0x6) { f_reg(rex, regmodrm) == 0x6) {
@ -1495,6 +1525,8 @@ db_disasm(db_addr_t loc, bool altfmt)
if (rep == TRUE) if (rep == TRUE)
db_printf("repe "); /* XXX repe VS rep */ db_printf("repe "); /* XXX repe VS rep */
if (repne == TRUE)
db_printf("repne ");
if (i_size == SDEP) { if (i_size == SDEP) {
if (size == LONG) if (size == LONG)