Provide source level debug ability in *unix environment.

[Background]
The UnixPkg provide an simulator in *unix. To support source level debug, we need force all modules be built as ELF shard objects and dynamically load all of modules using dlopen(). For peicore, peim and dxecore, we provide a wrapper to provide PeCoffLoader interface 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5382 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 15 insertions, 0 deletions

diff --git a/UnixPkg/Sec/SecMain.c b/UnixPkg/Sec/SecMain.c
index a6da20b135..bfa44e7a17 100644
--- a/UnixPkg/Sec/SecMain.c
+++ b/UnixPkg/Sec/SecMain.c
@@ -983,6 +983,21 @@ SecNt32PeCoffRelocateImage (
      (unsigned long)ImageContext->ImageAddress,
      (unsigned long)ImageContext->EntryPoint);
 
+  Handle = dlopen(ImageContext->PdbPointer, RTLD_NOW);
+  
+  if (Handle) {
+    Entry = dlsym(Handle, "_ModuleEntryPoint");
+  } else {
+    printf("%s\n", dlerror());  
+  }
+  
+  if (Entry != NULL) {
+    ImageContext->EntryPoint = Entry;
+    printf("Change %s Entrypoint to :0x%08lx\n", ImageContext->PdbPointer, Entry);
+  } else {
+    printf("Could not find _ModuleEntryPoint Entry, Module may be built error\n");
+  }
+
   SecUnixLoaderBreak ();
 
   return Status;