void nteh_usevars()
{
#if SCPP
// Turn off SFLdead and SFLunambig in Sflags
nteh_contextsym()->Sflags &= ~(SFLdead | SFLunambig);
nteh_contextsym()->Sflags |= SFLread;
nteh_ecodesym()->Sflags &= ~(SFLdead | SFLunambig);
nteh_ecodesym()->Sflags |= SFLread;
#else
// Turn off SFLdead and SFLunambig in Sflags
nteh_contextsym()->Sflags &= ~SFLdead;
nteh_contextsym()->Sflags |= SFLread;
#endif
}
code *nteh_filter(block *b)
{
code cs;
CodeBuilder cdb;
assert(b->BC == BC_filter);
if (b->Bflags & BFLehcode) // if referenced __ecode
{
/* Generate:
mov EAX,__context[EBP].info
mov EAX,[EAX]
mov EAX,[EAX]
mov __ecode[EBP],EAX
*/
cdb.append(getregs(mAX));
cs.Iop = 0x8B;
cs.Irm = modregrm(2,AX,BPRM);
cs.Iflags = 0;
cs.Irex = 0;
cs.IFL1 = FLconst;
// EBP offset of __context.info
cs.IEV1.Vint = nteh_EBPoffset_info();
cdb.gen(&cs); // MOV EAX,__context[EBP].info
cs.Irm = modregrm(0,AX,0);
cdb.gen(&cs); // MOV EAX,[EAX]
cdb.gen(&cs); // MOV EAX,[EAX]
cs.Iop = 0x89;
cs.Irm = modregrm(2,AX,BPRM);
cs.IFL1 = FLauto;
cs.IEVsym1 = nteh_ecodesym();
cs.IEVoffset1 = 0;
cdb.gen(&cs); // MOV __ecode[EBP],EAX
}
return cdb.finish();
}
