[src/trunk]: src/libexec/ld.elf_so Remove old assert that only two segments e...

[joerg <joerg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/5720ceede914
branches:  trunk
changeset: 824949:5720ceede914
user:      joerg <joerg%NetBSD.org@localhost>
date:      Fri Jun 23 15:29:21 2017 +0000

description:
Remove old assert that only two segments exist. The rest of the code has
been changed to cope with more and at least Go actively creates them.
Adjust the mapping size computation to use the maximum and not depend on
PT_LOAD segments to be in order.

diffstat:

 libexec/ld.elf_so/headers.c |  23 +++++++++++------------
 1 files changed, 11 insertions(+), 12 deletions(-)

diffs (62 lines):

diff -r 14a488406df2 -r 5720ceede914 libexec/ld.elf_so/headers.c
--- a/libexec/ld.elf_so/headers.c       Fri Jun 23 15:24:35 2017 +0000
+++ b/libexec/ld.elf_so/headers.c       Fri Jun 23 15:29:21 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: headers.c,v 1.61 2016/06/14 13:06:41 christos Exp $     */
+/*     $NetBSD: headers.c,v 1.62 2017/06/23 15:29:21 joerg Exp $        */
 
 /*
  * Copyright 1996 John D. Polstra.
@@ -40,7 +40,7 @@
 
 #include <sys/cdefs.h>
 #ifndef lint
-__RCSID("$NetBSD: headers.c,v 1.61 2016/06/14 13:06:41 christos Exp $");
+__RCSID("$NetBSD: headers.c,v 1.62 2017/06/23 15:29:21 joerg Exp $");
 #endif /* not lint */
 
 #include <err.h>
@@ -380,8 +380,9 @@
        Obj_Entry      *obj;
        const Elf_Phdr *phlimit = phdr + phnum;
        const Elf_Phdr *ph;
-       int             nsegs = 0;
-       Elf_Addr        vaddr;
+       bool            first_seg = true;
+       Elf_Addr        vaddr;
+       size_t          size;
 
        obj = _rtld_obj_new();
 
@@ -409,17 +410,16 @@
                        break;
 
                case PT_LOAD:
-                       assert(nsegs < 2);
-                       if (nsegs == 0) {       /* First load segment */
+                       size = round_up(vaddr + ph->p_memsz) - obj->vaddrbase;
+                       if (first_seg) {        /* First load segment */
                                obj->vaddrbase = round_down(vaddr);
                                obj->mapbase = (caddr_t)(uintptr_t)obj->vaddrbase;
-                               obj->textsize = round_up(vaddr + ph->p_memsz) -
-                                   obj->vaddrbase;
+                               obj->textsize = size;
+                               obj->mapsize = size;
+                               first_seg = false;
                        } else {                /* Last load segment */
-                               obj->mapsize = round_up(vaddr + ph->p_memsz) -
-                                   obj->vaddrbase;
+                               obj->mapsize = MAX(obj->mapsize, size);
                        }
-                       ++nsegs;
                        dbg(("headers: %s %p phsize %" PRImemsz,
                            "PT_LOAD", (void *)(uintptr_t)vaddr,
                             ph->p_memsz));
@@ -466,7 +466,6 @@
 #endif
                }
        }
-       assert(nsegs == 2);
 
        obj->entry = entry;
        return obj;