exec: keep track of the range where executable segments are mapped

Keep track of the range where executable segments are mapped into
memory and hand that information over to the proc server.

* exec/priv.h (struct execdata): Add {start,end}_code.
* exec/exec.c (prepare): Initialize {start,end}_code.
(load_section): Update {start,end}_code.
(do_exec): Use proc_set_code to hand {start,end}_code to the proc server.

1 files changed, 23 insertions, 0 deletions

diff --git a/exec/exec.c b/exec/exec.c
index f139792b..6eb81c8a 100644
--- a/exec/exec.c
+++ b/exec/exec.c
@@ -207,6 +207,17 @@ load_section (void *section, struct execdata *u)
 	    }
 	}
 
+      /* If this segment is executable, adjust start_code and end_code
+	 so that this mapping is within that range.  */
+      if (vm_prot & VM_PROT_EXECUTE)
+	{
+	  if (u->start_code == 0 || u->start_code > addr)
+	    u->start_code = addr;
+
+	  if (u->end_code < addr + memsz)
+	    u->end_code = addr + memsz;
+	}
+
       if (mapstart > addr)
 	{
 	  /* We must read and copy in the space in the section before the
@@ -445,6 +456,9 @@ prepare (file_t file, struct execdata *e)
 
   e->interp.section = NULL;
 
+  e->start_code = 0;
+  e->end_code = 0;
+
   /* Initialize E's stdio stream.  */
   prepare_stream (e);
 
@@ -1399,6 +1413,15 @@ do_exec (file_t file,
       }
   boot->user_entry = e.entry;	/* already adjusted in `load' */
 
+  /* Set the start_code and end_code values for this process.
+     /hurd/exec is used to start /hurd/proc, so at this point there is
+     no proc server, so we need to be careful here.  */
+  if (boot->portarray[INIT_PORT_PROC] != MACH_PORT_NULL)
+    e.error = proc_set_code (boot->portarray[INIT_PORT_PROC],
+			     e.start_code, e.end_code);
+  if (e.error)
+    goto out;
+
   /* Create the initial thread.  */
   e.error = thread_create (newtask, &thread);
   if (e.error)