[PATCH 16/17] exec: keep track of the range where executable segments are mapped

[Justus Winter]

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.
---
 exec/exec.c |   23 +++++++++++++++++++++++
 exec/priv.h |    4 ++++
 2 files changed, 27 insertions(+)

diff --git a/exec/exec.c b/exec/exec.c
index 30a5e00..de796f9 100644
--- a/exec/exec.c
+++ b/exec/exec.c
@@ -289,6 +289,17 @@ 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
@@ -732,6 +743,9 @@ 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);
 
@@ -1851,6 +1865,15 @@ 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)
diff --git a/exec/priv.h b/exec/priv.h
index dbecb7a..61c0e72 100644
--- a/exec/priv.h
+++ b/exec/priv.h
@@ -88,6 +88,10 @@ struct execdata
     vm_address_t entry;
     file_t file;
 
+    /* Set by load_section.  */
+    vm_address_t start_code;
+    vm_address_t end_code;
+
 #ifndef EXECDATA_STREAM
 
     /* Note that if `file_data' (below) is set, then these just point
-- 
1.7.10.4