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fixed zero ss selector case in x86_64 emulation

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1394 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2005-04-24 18:04:33 +00:00
parent c45b3c0e1b
commit b359d4e7e4
1 changed files with 16 additions and 9 deletions
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25
target-i386/helper.c
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@ -1494,11 +1494,12 @@ void load_seg(int seg_reg, int selector)
target_ulong ptr;
selector &= 0xffff;
cpl = env->hflags & HF_CPL_MASK;
if ((selector & 0xfffc) == 0) {
/* null selector case */
if (seg_reg == R_SS
#ifdef TARGET_X86_64
&& !(env->hflags & HF_CS64_MASK)
&& (!(env->hflags & HF_CS64_MASK) || cpl == 3)
#endif
)
raise_exception_err(EXCP0D_GPF, 0);
@ -1520,7 +1521,6 @@ void load_seg(int seg_reg, int selector)
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
rpl = selector & 3;
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
cpl = env->hflags & HF_CPL_MASK;
if (seg_reg == R_SS) {
/* must be writable segment */
if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK))
@ -2054,13 +2054,20 @@ static inline void helper_ret_protected(int shift, int is_iret, int addend)
new_ss, new_esp);
}
#endif
if ((env->hflags & HF_LMA_MASK) && (new_ss & 0xfffc) == 0) {
/* NULL ss is allowed in long mode */
cpu_x86_load_seg_cache(env, R_SS, new_ss,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK | (rpl << DESC_DPL_SHIFT) |
DESC_W_MASK | DESC_A_MASK);
if ((new_ss & 0xfffc) == 0) {
#ifdef TARGET_X86_64
/* NULL ss is allowed in long mode if cpl != 3*/
if ((env->hflags & HF_LMA_MASK) && rpl != 3) {
cpu_x86_load_seg_cache(env, R_SS, new_ss,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK | (rpl << DESC_DPL_SHIFT) |
DESC_W_MASK | DESC_A_MASK);
} else
#endif
{
raise_exception_err(EXCP0D_GPF, 0);
}
} else {
if ((new_ss & 3) != rpl)
raise_exception_err(EXCP0D_GPF, new_ss & 0xfffc);