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target-i386: Dump unknown opcodes with -d unimp

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We discriminate here between opcodes that are illegal in the current
cpu mode or with illegal arguments (such as modrm.mod == 3) and
encodings that are unknown (such as an unimplemented isa extension).

Backports commit b9f9c5b41aab06479cb1695990b7cca98ef84fc7 from qemu
This commit is contained in:
Richard Henderson 2018-02-21 21:34:08 -05:00 committed by Lioncash
parent 1c096b8fa2
commit 7775b05fb8
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 82 additions and 43 deletions
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125
qemu/target-i386/translate.c
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@ -74,6 +74,7 @@ typedef struct DisasContext {
int prefix; int prefix;
TCGMemOp aflag; TCGMemOp aflag;
TCGMemOp dflag; TCGMemOp dflag;
target_ulong pc_start;
target_ulong pc; /* pc = eip + cs_base */ target_ulong pc; /* pc = eip + cs_base */
int is_jmp; /* 1 = means jump (stop translation), 2 means CPU int is_jmp; /* 1 = means jump (stop translation), 2 means CPU
static state change (stop translation) */ static state change (stop translation) */
@ -2695,6 +2696,30 @@ static void gen_exception(DisasContext *s, int trapno, target_ulong cur_eip)
s->is_jmp = DISAS_TB_JUMP; s->is_jmp = DISAS_TB_JUMP;
} }
/* Generate #UD for the current instruction. The assumption here is that
the instruction is known, but it isn't allowed in the current cpu mode. */
static void gen_illegal_opcode(DisasContext *s)
{
gen_exception(s, EXCP06_ILLOP, s->pc_start - s->cs_base);
}
/* Similarly, except that the assumption here is that we don't decode
the instruction at all -- either a missing opcode, an unimplemented
feature, or just a bogus instruction stream. */
static void gen_unknown_opcode(CPUX86State *env, DisasContext *s)
{
gen_illegal_opcode(s);
if (qemu_loglevel_mask(LOG_UNIMP)) {
target_ulong pc = s->pc_start, end = s->pc;
qemu_log("ILLOPC: " TARGET_FMT_lx ":", pc);
for (; pc < end; ++pc) {
qemu_log(" %02x", cpu_ldub_code(env, pc));
}
qemu_log("\n");
}
}
/* an interrupt is different from an exception because of the /* an interrupt is different from an exception because of the
privilege checks */ privilege checks */
static void gen_interrupt(DisasContext *s, int intno, static void gen_interrupt(DisasContext *s, int intno,
@ -3459,7 +3484,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
b1 = 0; b1 = 0;
sse_fn_epp = sse_op_table1[b][b1]; sse_fn_epp = sse_op_table1[b][b1];
if (!sse_fn_epp) { if (!sse_fn_epp) {
goto illegal_op; goto unknown_op;
} }
if ((b <= 0x5f && b >= 0x10) || b == 0xc6 || b == 0xc2) { if ((b <= 0x5f && b >= 0x10) || b == 0xc6 || b == 0xc2) {
is_xmm = 1; is_xmm = 1;
@ -3478,15 +3503,19 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
} }
if (s->flags & HF_EM_MASK) { if (s->flags & HF_EM_MASK) {
illegal_op: illegal_op:
gen_exception(s, EXCP06_ILLOP, pc_start - s->cs_base); gen_illegal_opcode(s);
return; return;
} }
if (is_xmm && !(s->flags & HF_OSFXSR_MASK)) if (is_xmm
if ((b != 0x38 && b != 0x3a) || (s->prefix & PREFIX_DATA)) && !(s->flags & HF_OSFXSR_MASK)
goto illegal_op; && ((b != 0x38 && b != 0x3a) || (s->prefix & PREFIX_DATA))) {
goto unknown_op;
}
if (b == 0x0e) { if (b == 0x0e) {
if (!(s->cpuid_ext2_features & CPUID_EXT2_3DNOW)) if (!(s->cpuid_ext2_features & CPUID_EXT2_3DNOW)) {
goto illegal_op; /* If we were fully decoding this we might use illegal_op. */
goto unknown_op;
}
/* femms */ /* femms */
gen_helper_emms(tcg_ctx, cpu_env); gen_helper_emms(tcg_ctx, cpu_env);
return; return;
@ -3511,8 +3540,9 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
b |= (b1 << 8); b |= (b1 << 8);
switch(b) { switch(b) {
case 0x0e7: /* movntq */ case 0x0e7: /* movntq */
if (mod == 3) if (mod == 3) {
goto illegal_op; goto unknown_op;
}
gen_lea_modrm(env, s, modrm); gen_lea_modrm(env, s, modrm);
gen_stq_env_A0(s, offsetof(CPUX86State, fpregs[reg].mmx)); gen_stq_env_A0(s, offsetof(CPUX86State, fpregs[reg].mmx));
break; break;
@ -3838,7 +3868,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
case 0x172: case 0x172:
case 0x173: case 0x173:
if (b1 >= 2) { if (b1 >= 2) {
goto illegal_op; goto unknown_op;
} }
val = cpu_ldub_code(env, s->pc++); val = cpu_ldub_code(env, s->pc++);
if (is_xmm) { if (is_xmm) {
@ -3857,7 +3887,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
sse_fn_epp = sse_op_table2[((b - 1) & 3) * 8 + sse_fn_epp = sse_op_table2[((b - 1) & 3) * 8 +
(((modrm >> 3)) & 7)][b1]; (((modrm >> 3)) & 7)][b1];
if (!sse_fn_epp) { if (!sse_fn_epp) {
goto illegal_op; goto unknown_op;
} }
if (is_xmm) { if (is_xmm) {
rm = (modrm & 7) | REX_B(s); rm = (modrm & 7) | REX_B(s);
@ -4081,12 +4111,12 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
reg = ((modrm >> 3) & 7) | rex_r; reg = ((modrm >> 3) & 7) | rex_r;
mod = (modrm >> 6) & 3; mod = (modrm >> 6) & 3;
if (b1 >= 2) { if (b1 >= 2) {
goto illegal_op; goto unknown_op;
} }
sse_fn_epp = sse_op_table6[b].op[b1]; sse_fn_epp = sse_op_table6[b].op[b1];
if (!sse_fn_epp) { if (!sse_fn_epp) {
goto illegal_op; goto unknown_op;
} }
if (!(s->cpuid_ext_features & sse_op_table6[b].ext_mask)) if (!(s->cpuid_ext_features & sse_op_table6[b].ext_mask))
goto illegal_op; goto illegal_op;
@ -4136,7 +4166,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
} }
} }
if (sse_fn_epp == SSE_SPECIAL) { if (sse_fn_epp == SSE_SPECIAL) {
goto illegal_op; goto unknown_op;
} }
tcg_gen_addi_ptr(tcg_ctx, cpu_ptr0, cpu_env, op1_offset); tcg_gen_addi_ptr(tcg_ctx, cpu_ptr0, cpu_env, op1_offset);
@ -4504,12 +4534,12 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
@ -4521,12 +4551,12 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
reg = ((modrm >> 3) & 7) | rex_r; reg = ((modrm >> 3) & 7) | rex_r;
mod = (modrm >> 6) & 3; mod = (modrm >> 6) & 3;
if (b1 >= 2) { if (b1 >= 2) {
goto illegal_op; goto unknown_op;
} }
sse_fn_eppi = sse_op_table7[b].op[b1]; sse_fn_eppi = sse_op_table7[b].op[b1];
if (!sse_fn_eppi) { if (!sse_fn_eppi) {
goto illegal_op; goto unknown_op;
} }
if (!(s->cpuid_ext_features & sse_op_table7[b].ext_mask)) if (!(s->cpuid_ext_features & sse_op_table7[b].ext_mask))
goto illegal_op; goto illegal_op;
@ -4728,12 +4758,14 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
default: default:
goto illegal_op; unknown_op:
gen_unknown_opcode(env, s);
return;
} }
} else { } else {
/* generic MMX or SSE operation */ /* generic MMX or SSE operation */
@ -4806,11 +4838,12 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
} }
switch(b) { switch(b) {
case 0x0f: /* 3DNow! data insns */ case 0x0f: /* 3DNow! data insns */
if (!(s->cpuid_ext2_features & CPUID_EXT2_3DNOW))
goto illegal_op;
val = cpu_ldub_code(env, s->pc++); val = cpu_ldub_code(env, s->pc++);
sse_fn_epp = sse_op_table5[val]; sse_fn_epp = sse_op_table5[val];
if (!sse_fn_epp) { if (!sse_fn_epp) {
goto unknown_op;
}
if (!(s->cpuid_ext2_features & CPUID_EXT2_3DNOW)) {
goto illegal_op; goto illegal_op;
} }
tcg_gen_addi_ptr(tcg_ctx, cpu_ptr0, cpu_env, op1_offset); tcg_gen_addi_ptr(tcg_ctx, cpu_ptr0, cpu_env, op1_offset);
@ -4830,7 +4863,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
/* compare insns */ /* compare insns */
val = cpu_ldub_code(env, s->pc++); val = cpu_ldub_code(env, s->pc++);
if (val >= 8) if (val >= 8)
goto illegal_op; goto unknown_op;
sse_fn_epp = sse_op_table4[val][b1]; sse_fn_epp = sse_op_table4[val][b1];
tcg_gen_addi_ptr(tcg_ctx, cpu_ptr0, cpu_env, op1_offset); tcg_gen_addi_ptr(tcg_ctx, cpu_ptr0, cpu_env, op1_offset);
@ -4917,7 +4950,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
bool cc_op_dirty = s->cc_op_dirty; bool cc_op_dirty = s->cc_op_dirty;
bool changed_cc_op = false; bool changed_cc_op = false;
s->pc = pc_start; s->pc_start = s->pc = pc_start;
// end address tells us to stop emulation // end address tells us to stop emulation
if (s->pc == s->uc->addr_end) { if (s->pc == s->uc->addr_end) {
@ -5069,7 +5102,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
b = 0x13a; b = 0x13a;
break; break;
default: /* Reserved for future use. */ default: /* Reserved for future use. */
goto illegal_op; goto unknown_op;
} }
} }
s->vex_v = (~vex3 >> 3) & 0xf; s->vex_v = (~vex3 >> 3) & 0xf;
@ -5421,7 +5454,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
} }
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
@ -5434,7 +5467,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
rm = (modrm & 7) | REX_B(s); rm = (modrm & 7) | REX_B(s);
op = (modrm >> 3) & 7; op = (modrm >> 3) & 7;
if (op >= 2 && b == 0xfe) { if (op >= 2 && b == 0xfe) {
goto illegal_op; goto unknown_op;
} }
if (CODE64(s)) { if (CODE64(s)) {
if (op == 2 || op == 4) { if (op == 2 || op == 4) {
@ -5527,7 +5560,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
gen_push_v(s, cpu_T0); gen_push_v(s, cpu_T0);
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
@ -6472,7 +6505,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
gen_helper_fwait(tcg_ctx, cpu_env); gen_helper_fwait(tcg_ctx, cpu_env);
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
case 0x0c: /* grp d9/4 */ case 0x0c: /* grp d9/4 */
@ -6491,7 +6524,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
gen_helper_fxam_ST0(tcg_ctx, cpu_env); gen_helper_fxam_ST0(tcg_ctx, cpu_env);
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
case 0x0d: /* grp d9/5 */ case 0x0d: /* grp d9/5 */
@ -6526,7 +6559,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
gen_helper_fldz_ST0(tcg_ctx, cpu_env); gen_helper_fldz_ST0(tcg_ctx, cpu_env);
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
} }
break; break;
@ -6626,7 +6659,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
gen_helper_fpop(tcg_ctx, cpu_env); gen_helper_fpop(tcg_ctx, cpu_env);
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
case 0x1c: case 0x1c:
@ -6644,7 +6677,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
case 4: /* fsetpm (287 only, just do nop here) */ case 4: /* fsetpm (287 only, just do nop here) */
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
case 0x1d: /* fucomi */ case 0x1d: /* fucomi */
@ -6696,7 +6729,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
gen_helper_fpop(tcg_ctx, cpu_env); gen_helper_fpop(tcg_ctx, cpu_env);
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
case 0x38: /* ffreep sti, undocumented op */ case 0x38: /* ffreep sti, undocumented op */
@ -6711,7 +6744,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
gen_op_mov_reg_v(tcg_ctx, MO_16, R_EAX, cpu_T0); gen_op_mov_reg_v(tcg_ctx, MO_16, R_EAX, cpu_T0);
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
case 0x3d: /* fucomip */ case 0x3d: /* fucomip */
@ -7203,7 +7236,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
val = cpu_ldub_code(env, s->pc++); val = cpu_ldub_code(env, s->pc++);
tcg_gen_movi_tl(tcg_ctx, cpu_T1, val); tcg_gen_movi_tl(tcg_ctx, cpu_T1, val);
if (op < 4) if (op < 4)
goto illegal_op; goto unknown_op;
op -= 4; op -= 4;
goto bt_op; goto bt_op;
case 0x1a3: /* bt Gv, Ev */ case 0x1a3: /* bt Gv, Ev */
@ -7720,7 +7753,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
set_cc_op(s, CC_OP_EFLAGS); set_cc_op(s, CC_OP_EFLAGS);
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
@ -8041,7 +8074,7 @@ case 0x101:
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
@ -8410,7 +8443,7 @@ case 0x101:
} }
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
} }
break; break;
@ -8646,7 +8679,7 @@ case 0x101:
} }
break; break;
} }
goto illegal_op; goto unknown_op;
case 0xf8: /* sfence / pcommit */ case 0xf8: /* sfence / pcommit */
if (prefixes & PREFIX_DATA) { if (prefixes & PREFIX_DATA) {
@ -8688,7 +8721,7 @@ case 0x101:
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
break; break;
@ -8757,7 +8790,7 @@ case 0x101:
gen_sse(env, s, b, pc_start, rex_r); gen_sse(env, s, b, pc_start, rex_r);
break; break;
default: default:
goto illegal_op; goto unknown_op;
} }
/* lock generation */ /* lock generation */
if (s->prefix & PREFIX_LOCK) if (s->prefix & PREFIX_LOCK)
@ -8790,7 +8823,13 @@ case 0x101:
if (s->prefix & PREFIX_LOCK) if (s->prefix & PREFIX_LOCK)
gen_helper_unlock(tcg_ctx, cpu_env); gen_helper_unlock(tcg_ctx, cpu_env);
/* XXX: ensure that no lock was generated */ /* XXX: ensure that no lock was generated */
gen_exception(s, EXCP06_ILLOP, pc_start - s->cs_base); gen_illegal_opcode(s);
return s->pc;
unknown_op:
if (s->prefix & PREFIX_LOCK)
gen_helper_unlock(tcg_ctx, cpu_env);
/* XXX: ensure that no lock was generated */
gen_unknown_opcode(env, s);
return s->pc; return s->pc;
} }