syscall_emul: [PATCH 15/22] add clone/execve for threading and multiprocess simulations

Modifies the clone system call and adds execve system call. Requires allowing
processes to steal thread contexts from other processes in the same system
object and the ability to detach pieces of process state (such as MemState)
to allow dynamic sharing.

3 files changed, 14 insertions, 0 deletions

diff --git a/src/mem/page_table.cc b/src/mem/page_table.cc
index 8ff640837..0abe8eaf3 100644
--- a/src/mem/page_table.cc
+++ b/src/mem/page_table.cc
@@ -104,6 +104,13 @@ FuncPageTable::remap(Addr vaddr, int64_t size, Addr new_vaddr)
 }
 
 void
+FuncPageTable::getMappings(std::vector<std::pair<Addr, Addr>> *addr_maps)
+{
+    for (auto &iter : pTable)
+        addr_maps->push_back(make_pair(iter.first, iter.second.pageStart()));
+}
+
+void
 FuncPageTable::unmap(Addr vaddr, int64_t size)
 {
     assert(pageOffset(vaddr) == 0);
diff --git a/src/mem/page_table.hh b/src/mem/page_table.hh
index 9b24c0efa..0d0a75ef5 100644
--- a/src/mem/page_table.hh
+++ b/src/mem/page_table.hh
@@ -194,6 +194,9 @@ class PageTableBase : public Serializable
             pTableCache[2].valid = false;
         }
     }
+
+    virtual void getMappings(std::vector<std::pair<Addr, Addr>>
+                             *addr_mappings) {};
 };
 
 /**
@@ -239,6 +242,8 @@ class FuncPageTable : public PageTableBase
 
     void serialize(CheckpointOut &cp) const override;
     void unserialize(CheckpointIn &cp) override;
+
+    void getMappings(std::vector<std::pair<Addr, Addr>> *addr_maps) override;
 };
 
 /**
diff --git a/src/mem/se_translating_port_proxy.hh b/src/mem/se_translating_port_proxy.hh
index bb823a75b..5ac6b5286 100644
--- a/src/mem/se_translating_port_proxy.hh
+++ b/src/mem/se_translating_port_proxy.hh
@@ -83,6 +83,8 @@ class SETranslatingPortProxy : public PortProxy
     SETranslatingPortProxy(MasterPort& port, Process* p, AllocType alloc);
     virtual ~SETranslatingPortProxy();
 
+    void setPageTable(PageTableBase *p) { pTable = p; }
+    void setProcess(Process *p) { process = p; }
     bool tryReadBlob(Addr addr, uint8_t *p, int size) const;
     bool tryWriteBlob(Addr addr, const uint8_t *p, int size) const;
     bool tryMemsetBlob(Addr addr, uint8_t val, int size) const;