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Do not use load_seg_vm to load CS in real mode iret handling 

load_seg_vm calls cpu_x86_load_seg_cache which updates hflags of
current env, real hardware doesn't do this, nor the code that handles
real mode lret/lcall/ljmp.

This unbreaks "unreal mode" and makes QEMU the first emulator being
able to run Project Angel demo by IMPACT Studios. (Not that there are
many physical machines out there capable of doing the same)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5403 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
malc 2008-10-02 20:02:27 +00:00
parent 78f5bf1e6f
commit bdadc0b5b6
1 changed files with 2 additions and 1 deletions
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3
target-i386/op_helper.c
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@ -2651,7 +2651,8 @@ void helper_iret_real(int shift)
POPW(ssp, sp, sp_mask, new_eflags);
}
ESP = (ESP & ~sp_mask) | (sp & sp_mask);
load_seg_vm(R_CS, new_cs);
env->segs[R_CS].selector = new_cs;
env->segs[R_CS].base = (new_cs << 4);
env->eip = new_eip;
if (env->eflags & VM_MASK)
eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | RF_MASK | NT_MASK;