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ppcdrc.cpp: clear two LSBs of the branch target address.

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This is what a real CPU does in order to prevent branching to an invalid address.
This commit is contained in:
Maxim Poliakovski 2016-12-25 17:58:27 +01:00
parent 0cbc070ce4
commit 619e737610
1 changed files with 5 additions and 2 deletions
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7
src/devices/cpu/powerpc/ppcdrc.cpp
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@ -1942,8 +1942,11 @@ void ppc_device::generate_branch(drcuml_block *block, compiler_state *compiler,
}
else
{
generate_update_cycles(block, &compiler_temp, mem(srcptr), true); // <subtract cycles>
UML_HASHJMP(block, m_core->mode, mem(srcptr), *m_nocode); // hashjmp <mode>,<rsreg>,nocode
generate_update_cycles(block, &compiler_temp, mem(srcptr), true); // <subtract cycles>
/* clear two LSBs of the target address to prevent branching to an invalid address */
UML_AND(block, I0, mem(srcptr), 0xFFFFFFFC); // and i0, 0xFFFFFFFC
UML_HASHJMP(block, m_core->mode, I0, *m_nocode); // hashjmp <mode>,i0,nocode
}
/* update the label */