From 37b45e3c8cb2aef57e1d5dd8efd46705b8d46c16 Mon Sep 17 00:00:00 2001
From: Ali Saidi <saidi@eecs.umich.edu>
Date: Wed, 9 May 2007 15:37:46 -0400
Subject: fix the translating ports so it can add a page on a fault

--HG--
extra : convert_revision : 56f6f2cbf4e92b7f2dd8c9453831fab86d83ef80
---
 src/sim/process.cc | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

(limited to 'src/sim/process.cc')

diff --git a/src/sim/process.cc b/src/sim/process.cc
index 68239fa52..8b273d591 100644
--- a/src/sim/process.cc
+++ b/src/sim/process.cc
@@ -47,6 +47,7 @@
 #include "mem/translating_port.hh"
 #include "sim/builder.hh"
 #include "sim/process.hh"
+#include "sim/process_impl.hh"
 #include "sim/stats.hh"
 #include "sim/syscall_emul.hh"
 #include "sim/system.hh"
@@ -182,7 +183,8 @@ Process::startup()
 
     Port *mem_port;
     mem_port = system->physmem->getPort("functional");
-    initVirtMem = new TranslatingPort("process init port", pTable, true);
+    initVirtMem = new TranslatingPort("process init port", this,
+            TranslatingPort::Always);
     mem_port->setPeer(initVirtMem);
     initVirtMem->setPeer(mem_port);
 }
@@ -250,6 +252,29 @@ Process::sim_fd(int tgt_fd)
     return fd_map[tgt_fd];
 }
 
+bool
+Process::checkAndAllocNextPage(Addr vaddr)
+{
+    // if this is an initial write we might not have
+    if (vaddr >= stack_min && vaddr < stack_base) {
+        pTable->allocate(roundDown(vaddr, VMPageSize), VMPageSize);
+        return true;
+    }
+
+    // We've accessed the next page of the stack, so extend the stack
+    // to cover it.
+    if(vaddr < stack_min && vaddr >= stack_min - TheISA::PageBytes)
+    {
+        stack_min -= TheISA::PageBytes;
+        if(stack_base - stack_min > 8*1024*1024)
+            fatal("Over max stack size for one thread\n");
+        pTable->allocate(stack_min, TheISA::PageBytes);
+        warn("Increasing stack size by one page.");
+        return true;
+    }
+    return false;
+}
+
 void
 Process::serialize(std::ostream &os)
 {
-- 
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