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target-i386: Fix exceptions for fxsave/fxrstor 

This patch corrects the following aspects of exception generation in
fxsave/fxrstor:

* Generate #GP if the operand is not aligned to a 16 byte boundary
* Generate #UD if the LOCK prefix is used
* For CR0.EM = 1 #NM is generated, not #UD

Signed-off-by: Kevin Wolf <mail@kevin-wolf.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Kevin Wolf 2009-10-02 22:28:57 +02:00 committed by Aurelien Jarno
parent 94f4af02a1
commit 09d85fb843
2 changed files with 14 additions and 4 deletions
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10
target-i386/op_helper.c
View File

@ -4350,6 +4350,11 @@ void helper_fxsave(target_ulong ptr, int data64)
CPU86_LDouble tmp;
target_ulong addr;
/* The operand must be 16 byte aligned */
if (ptr & 0xf) {
raise_exception(EXCP0D_GPF);
}
fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
fptag = 0;
for(i = 0; i < 8; i++) {
@ -4406,6 +4411,11 @@ void helper_fxrstor(target_ulong ptr, int data64)
CPU86_LDouble tmp;
target_ulong addr;
/* The operand must be 16 byte aligned */
if (ptr & 0xf) {
raise_exception(EXCP0D_GPF);
}
env->fpuc = lduw(ptr);
fpus = lduw(ptr + 2);
fptag = lduw(ptr + 4);

8
target-i386/translate.c
View File

@ -7502,9 +7502,9 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start)
switch(op) {
case 0: /* fxsave */
if (mod == 3 || !(s->cpuid_features & CPUID_FXSR) ||
(s->flags & HF_EM_MASK))
(s->prefix & PREFIX_LOCK))
goto illegal_op;
if (s->flags & HF_TS_MASK) {
if ((s->flags & HF_EM_MASK) || (s->flags & HF_TS_MASK)) {
gen_exception(s, EXCP07_PREX, pc_start - s->cs_base);
break;
}
@ -7516,9 +7516,9 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start)
break;
case 1: /* fxrstor */
if (mod == 3 || !(s->cpuid_features & CPUID_FXSR) ||
(s->flags & HF_EM_MASK))
(s->prefix & PREFIX_LOCK))
goto illegal_op;
if (s->flags & HF_TS_MASK) {
if ((s->flags & HF_EM_MASK) || (s->flags & HF_TS_MASK)) {
gen_exception(s, EXCP07_PREX, pc_start - s->cs_base);
break;
}