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When speculation fails (as determined by the chk instruction) the

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processor is to jump to recovery code. This branching behaviour
may not be implemented by the processor and a Speculative Operation
fault is raised. The OS is responsible to emulate the branch.
Implement this, because GCC 4.2 uses advanced loads regularly.
This commit is contained in:
Marcel Moolenaar 2007-05-21 05:11:43 +00:00
parent 3662c7b8ad
commit 6de61ca8f8
1 changed files with 13 additions and 1 deletions
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14
sys/ia64/ia64/trap.c
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@ -629,8 +629,20 @@ trap(int vector, struct trapframe *tf)
break;
}
case IA64_VEC_NAT_CONSUMPTION:
case IA64_VEC_SPECULATION:
/*
* The branching behaviour of the chk instruction is not
* implemented by the processor. All we need to do is
* compute the target address of the branch and make sure
* that control is transfered to that address.
* We should do this in the IVT table and not by entring
* the kernel...
*/
tf->tf_special.iip += tf->tf_special.ifa << 4;
tf->tf_special.psr &= ~IA64_PSR_RI;
goto out;
case IA64_VEC_NAT_CONSUMPTION:
case IA64_VEC_UNSUPP_DATA_REFERENCE:
if (user) {
ucode = vector;