TF flag support - fixed eflags computation before exception

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@145 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2003-05-10 15:07:51 +00:00
parent cabb4d616d
commit c50c0c3fbf

View File

@ -132,6 +132,7 @@ typedef struct DisasContext {
int vm86; /* vm86 mode */
int cpl;
int iopl;
int tf; /* TF cpu flag */
} DisasContext;
/* i386 arith/logic operations */
@ -1366,6 +1367,15 @@ static void gen_enter(DisasContext *s, int esp_addend, int level)
gen_op_mov_reg_T1[ot][R_ESP]();
}
static void gen_exception(DisasContext *s, int trapno, unsigned int cur_eip)
{
if (s->cc_op != CC_OP_DYNAMIC)
gen_op_set_cc_op(s->cc_op);
gen_op_jmp_im(cur_eip);
gen_op_raise_exception(trapno);
s->is_jmp = 1;
}
/* return the next pc address. Return -1 if no insn found. *is_jmp_ptr
is set to true if the instruction sets the PC (last instruction of
a basic block) */
@ -2770,8 +2780,7 @@ long disas_insn(DisasContext *s, uint8_t *pc_start)
case 0x6d:
if (s->cpl > s->iopl || s->vm86) {
/* NOTE: even for (E)CX = 0 the exception is raised */
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
} else {
if ((b & 1) == 0)
ot = OT_BYTE;
@ -2788,8 +2797,7 @@ long disas_insn(DisasContext *s, uint8_t *pc_start)
case 0x6f:
if (s->cpl > s->iopl || s->vm86) {
/* NOTE: even for (E)CX = 0 the exception is raised */
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
} else {
if ((b & 1) == 0)
ot = OT_BYTE;
@ -2808,8 +2816,7 @@ long disas_insn(DisasContext *s, uint8_t *pc_start)
case 0xe4:
case 0xe5:
if (s->cpl > s->iopl || s->vm86) {
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
} else {
if ((b & 1) == 0)
ot = OT_BYTE;
@ -2824,8 +2831,7 @@ long disas_insn(DisasContext *s, uint8_t *pc_start)
case 0xe6:
case 0xe7:
if (s->cpl > s->iopl || s->vm86) {
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
} else {
if ((b & 1) == 0)
ot = OT_BYTE;
@ -2840,8 +2846,7 @@ long disas_insn(DisasContext *s, uint8_t *pc_start)
case 0xec:
case 0xed:
if (s->cpl > s->iopl || s->vm86) {
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
} else {
if ((b & 1) == 0)
ot = OT_BYTE;
@ -2855,8 +2860,7 @@ long disas_insn(DisasContext *s, uint8_t *pc_start)
case 0xee:
case 0xef:
if (s->cpl > s->iopl || s->vm86) {
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
} else {
if ((b & 1) == 0)
ot = OT_BYTE;
@ -2928,8 +2932,7 @@ long disas_insn(DisasContext *s, uint8_t *pc_start)
break;
case 0xcf: /* iret */
if (s->vm86 && s->iopl != 3) {
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
} else {
/* XXX: not restartable */
/* pop offset */
@ -3066,8 +3069,7 @@ long disas_insn(DisasContext *s, uint8_t *pc_start)
/* flags */
case 0x9c: /* pushf */
if (s->vm86 && s->iopl != 3) {
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
} else {
if (s->cc_op != CC_OP_DYNAMIC)
gen_op_set_cc_op(s->cc_op);
@ -3077,8 +3079,7 @@ long disas_insn(DisasContext *s, uint8_t *pc_start)
break;
case 0x9d: /* popf */
if (s->vm86 && s->iopl != 3) {
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
} else {
gen_pop_T0(s);
if (s->dflag) {
@ -3248,11 +3249,12 @@ long disas_insn(DisasContext *s, uint8_t *pc_start)
case 0x90: /* nop */
break;
case 0xcc: /* int3 */
gen_op_int3((long)pc_start);
s->is_jmp = 1;
gen_exception(s, EXCP03_INT3, pc_start - s->cs_base);
break;
case 0xcd: /* int N */
val = ldub(s->pc++);
if (s->cc_op != CC_OP_DYNAMIC)
gen_op_set_cc_op(s->cc_op);
gen_op_int_im(val, pc_start - s->cs_base);
s->is_jmp = 1;
break;
@ -3266,15 +3268,13 @@ long disas_insn(DisasContext *s, uint8_t *pc_start)
if (s->cpl <= s->iopl) {
gen_op_cli();
} else {
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
}
} else {
if (s->iopl == 3) {
gen_op_cli();
} else {
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
}
}
break;
@ -3283,15 +3283,13 @@ long disas_insn(DisasContext *s, uint8_t *pc_start)
if (s->cpl <= s->iopl) {
gen_op_sti();
} else {
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
}
} else {
if (s->iopl == 3) {
gen_op_sti();
} else {
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
}
}
break;
@ -3343,8 +3341,7 @@ long disas_insn(DisasContext *s, uint8_t *pc_start)
break;
case 0xf4: /* hlt */
/* XXX: if cpl == 0, then should do something else */
gen_op_gpf(pc_start - s->cs_base);
s->is_jmp = 1;
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
break;
default:
goto illegal_op;
@ -3453,7 +3450,6 @@ static uint16_t opc_read_flags[NB_OPS] = {
[INDEX_op_setle_T0_subl] = CC_O | CC_S | CC_Z,
[INDEX_op_movl_T0_eflags] = CC_OSZAPC,
[INDEX_op_movl_T0_eflags_vm] = CC_OSZAPC,
[INDEX_op_cmc] = CC_C,
[INDEX_op_salc] = CC_C,
@ -3504,9 +3500,7 @@ static uint16_t opc_write_flags[NB_OPS] = {
[INDEX_op_movb_eflags_T0] = CC_S | CC_Z | CC_A | CC_P | CC_C,
[INDEX_op_movw_eflags_T0] = CC_OSZAPC,
[INDEX_op_movw_eflags_T0_vm] = CC_OSZAPC,
[INDEX_op_movl_eflags_T0] = CC_OSZAPC,
[INDEX_op_movl_eflags_T0_vm] = CC_OSZAPC,
[INDEX_op_clc] = CC_C,
[INDEX_op_stc] = CC_C,
[INDEX_op_cmc] = CC_C,
@ -3726,6 +3720,7 @@ int cpu_x86_gen_code(uint8_t *gen_code_buf, int max_code_size,
dc->vm86 = (flags >> GEN_FLAG_VM_SHIFT) & 1;
dc->cpl = (flags >> GEN_FLAG_CPL_SHIFT) & 3;
dc->iopl = (flags >> GEN_FLAG_IOPL_SHIFT) & 3;
dc->tf = (flags >> GEN_FLAG_TF_SHIFT) & 1;
dc->cc_op = CC_OP_DYNAMIC;
dc->cs_base = cs_base;
@ -3747,6 +3742,10 @@ int cpu_x86_gen_code(uint8_t *gen_code_buf, int max_code_size,
break;
}
pc_ptr = (void *)ret;
/* if single step mode, we generate only one instruction and
generate an exception */
if (dc->tf)
break;
} while (!dc->is_jmp && gen_opc_ptr < gen_opc_end);
/* we must store the eflags state if it is not already done */
if (dc->cc_op != CC_OP_DYNAMIC)
@ -3755,6 +3754,10 @@ int cpu_x86_gen_code(uint8_t *gen_code_buf, int max_code_size,
/* we add an additionnal jmp to update the simulated PC */
gen_op_jmp_im(ret - (unsigned long)dc->cs_base);
}
if (dc->tf) {
gen_op_raise_exception(EXCP01_SSTP);
}
*gen_opc_ptr = INDEX_op_end;
#ifdef DEBUG_DISAS