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Trap if add would switch instruction set.

This commit is contained in:
Christian Speckner 2024-08-10 09:29:23 +02:00
parent e7de075b20
commit b45eb6247d
1 changed files with 3 additions and 0 deletions
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3
src/emucore/CortexM0.cxx
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@ -999,6 +999,9 @@ CortexM0::err_t CortexM0::execute(uInt16 inst, uInt8 op)
rc = ra + rb; rc = ra + rb;
if(rd == 15) if(rd == 15)
{ {
if ((rc & 1) == 0)
return errIntrinsic(ERR_INVALID_OPERATING_MODE, read_register(15) - 4);
rc &= ~1; //write_register may f this as well rc &= ~1; //write_register may f this as well
rc += 2; //The program counter is special rc += 2; //The program counter is special
} }