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fixed null segment validation (aka x86_64 regression bug)

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1708 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2005-12-17 02:59:58 +00:00
parent d3e9db933f
commit cd072e01d8
1 changed files with 8 additions and 1 deletions
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7
target-i386/helper.c
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@ -1987,6 +1987,13 @@ static inline void validate_seg(int seg_reg, int cpl)
int dpl;
uint32_t e2;
/* XXX: on x86_64, we do not want to nullify FS and GS because
they may still contain a valid base. I would be interested to
know how a real x86_64 CPU behaves */
if ((seg_reg == R_FS || seg_reg == R_GS) &&
(env->segs[seg_reg].selector & 0xfffc) == 0)
return;
e2 = env->segs[seg_reg].flags;
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (!(e2 & DESC_CS_MASK) || !(e2 & DESC_C_MASK)) {