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.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/cpu/thread_context.hh b/src/cpu/thread_context.hh
index ecbd1a41e..bb6b54c08 100644
--- a/src/cpu/thread_context.hh
+++ b/src/cpu/thread_context.hh
@@ -161,6 +161,8 @@ class ThreadContext
 
     virtual Process *getProcessPtr() = 0;
 
+    virtual void setProcessPtr(Process *p) = 0;
+
     virtual Status status() const = 0;
 
     virtual void setStatus(Status new_status) = 0;
@@ -223,6 +225,14 @@ class ThreadContext
 
     virtual void pcState(const TheISA::PCState &val) = 0;
 
+    void
+    setNPC(Addr val)
+    {
+        TheISA::PCState pc_state = pcState();
+        pc_state.setNPC(val);
+        pcState(pc_state);
+    }
+
     virtual void pcStateNoRecord(const TheISA::PCState &val) = 0;
 
     virtual Addr instAddr() = 0;
@@ -360,6 +370,8 @@ class ProxyThreadContext : public ThreadContext
 
     Process *getProcessPtr() { return actualTC->getProcessPtr(); }
 
+    void setProcessPtr(Process *p) { actualTC->setProcessPtr(p); }
+
     Status status() const { return actualTC->status(); }
 
     void setStatus(Status new_status) { actualTC->setStatus(new_status); }