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authorAli Saidi <saidi@eecs.umich.edu>2006-06-26 16:49:05 -0400
committerAli Saidi <saidi@eecs.umich.edu>2006-06-26 16:49:05 -0400
commitc4be6f1e64a7bdd0c5057e2ab3f6a117444bc8ea (patch)
treebda9a1246d36fed3c8c9f23bf7d9f70b0af01bbb /src/arch/alpha
parentdeaf940946a7381d6f77dd8732951ff5ba0d1e8c (diff)
downloadgem5-c4be6f1e64a7bdd0c5057e2ab3f6a117444bc8ea.tar.xz
add syscall emulation page table fault so we can allocate more stack pages
src/cpu/simple/base.cc: add syscall emulation page table fault so we can allocate more stack pages FaultBase::invoke will do this, we don't need to do it here src/sim/faults.hh: I have no idea why this #if was there... gone src/sim/process.cc: make stack_min actually be the current minimum --HG-- extra : convert_revision : 9786b39f2747b94654a5d77c74243cd20503add4
Diffstat (limited to 'src/arch/alpha')
-rw-r--r--src/arch/alpha/faults.cc31
-rw-r--r--src/arch/alpha/faults.hh23
2 files changed, 54 insertions, 0 deletions
diff --git a/src/arch/alpha/faults.cc b/src/arch/alpha/faults.cc
index 8493223ff..06765768a 100644
--- a/src/arch/alpha/faults.cc
+++ b/src/arch/alpha/faults.cc
@@ -35,6 +35,9 @@
#include "base/trace.hh"
#if FULL_SYSTEM
#include "arch/alpha/ev5.hh"
+#else
+#include "sim/process.hh"
+#include "mem/page_table.hh"
#endif
namespace AlphaISA
@@ -56,6 +59,12 @@ FaultName ArithmeticFault::_name = "arith";
FaultVect ArithmeticFault::_vect = 0x0501;
FaultStat ArithmeticFault::_count;
+#if !FULL_SYSTEM
+FaultName PageTableFault::_name = "page_table_fault";
+FaultVect PageTableFault::_vect = 0x0000;
+FaultStat PageTableFault::_count;
+#endif
+
FaultName InterruptFault::_name = "interrupt";
FaultVect InterruptFault::_vect = 0x0101;
FaultStat InterruptFault::_count;
@@ -173,6 +182,28 @@ void ItbFault::invoke(ThreadContext * tc)
AlphaFault::invoke(tc);
}
+#else //!FULL_SYSTEM
+
+void PageTableFault::invoke(ThreadContext *tc)
+{
+ Process *p = tc->getProcessPtr();
+
+ // address is higher than the stack region or in the current stack region
+ if (vaddr > p->stack_base || vaddr > p->stack_min)
+ FaultBase::invoke(tc);
+
+ // We've accessed the next page
+ if (vaddr > p->stack_min - PageBytes) {
+ p->stack_min -= PageBytes;
+ if (p->stack_base - p->stack_min > 8*1024*1024)
+ fatal("Over max stack size for one thread\n");
+ p->pTable->allocate(p->stack_min, PageBytes);
+ warn("Increasing stack size by one page.");
+ } else {
+ FaultBase::invoke(tc);
+ }
+}
+
#endif
} // namespace AlphaISA
diff --git a/src/arch/alpha/faults.hh b/src/arch/alpha/faults.hh
index f952cf9d6..11a568174 100644
--- a/src/arch/alpha/faults.hh
+++ b/src/arch/alpha/faults.hh
@@ -81,6 +81,29 @@ class AlignmentFault : public AlphaFault
bool isAlignmentFault() {return true;}
};
+#if !FULL_SYSTEM
+class PageTableFault : public AlphaFault
+{
+ private:
+ Addr vaddr;
+ static FaultName _name;
+ static FaultVect _vect;
+ static FaultStat _count;
+ public:
+ PageTableFault(Addr va)
+ : vaddr(va) {}
+ FaultName name() {return _name;}
+ FaultVect vect() {return _vect;}
+ FaultStat & countStat() {return _count;}
+ void invoke(ThreadContext * tc);
+};
+
+static inline Fault genPageTableFault(Addr va)
+{
+ return new PageTableFault(va);
+}
+#endif
+
static inline Fault genMachineCheckFault()
{
return new MachineCheckFault;