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O3CPU: Add a hack to ensure that nextPC is set correctly after syscalls.

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Just check CPU's nextPC before and after syscall and if it changes,
update this instruction's nextPC because the syscall must have changed
the nextPC.
This commit is contained in:
Kevin Lim 2008-09-26 07:44:06 -07:00
parent 70ec46de17
commit 712a8ee700
1 changed files with 8 additions and 0 deletions
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8
src/cpu/o3/alpha/dyn_inst_impl.hh
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@ -161,7 +161,15 @@ template <class Impl>
void void
AlphaDynInst<Impl>::syscall(int64_t callnum) AlphaDynInst<Impl>::syscall(int64_t callnum)
{ {
// HACK: check CPU's nextPC before and after syscall. If it
// changes, update this instruction's nextPC because the syscall
// must have changed the nextPC.
Addr cpu_next_pc = this->cpu->readNextPC(this->threadNumber);
this->cpu->syscall(callnum, this->threadNumber); this->cpu->syscall(callnum, this->threadNumber);
Addr new_next_pc = this->cpu->readNextPC(this->threadNumber);
if (cpu_next_pc != new_next_pc) {
this->setNextPC(new_next_pc);
}
} }
#endif #endif