Possible problem debug sections default addresses on powerpc-linux-gnu

[Franz Sirl <Franz dot Sirl-kernel at lauterbach dot com>]

Hi,

while loading a vmlinux kernel file with debugging information, I got a warning
about some debug section addresses not being 0. I tracked this down to the
linkerscript "vmlinux.lds" used during kernel builds, which doesn't mention any
debug sections like .stab at all. After adding the debug section entries from
elf.sc to vmlinux.lds the warning went away.

readelf -a shows the following differences:

--- old     Wed Apr 12 00:31:56 2000
+++ new        Wed Apr 12 00:32:02 2000
@@ -32,9 +32,9 @@
   [ 8] .text.init        PROGBITS        c00da000 0ea000 00847c 00  AX   0   0 4
   [ 9] .data.init        PROGBITS        c00e247c 0f247c 000a08 00  WA   0   0 4
   [10] .bss              NOBITS          c00e3000 0f3000 01864c 00  WA   0   0 16
-  [11] .stab             PROGBITS        c00fb64c 0f3000 233db4 0c      13   0 4
-  [12] .comment          PROGBITS        c0441cc0 326db4 002f49 00       0   0 1
-  [13] .stabstr          STRTAB          c032f400 329cfd 1128c0 00       0   0 1
+  [11] .stab             PROGBITS        00000000 0f3000 233db4 0c      12   0 4
+  [12] .stabstr          STRTAB          00000000 326db4 1128c0 00       0   0 1
+  [13] .comment          PROGBITS        00000000 439674 002f49 00       0   0 1
   [14] .shstrtab         STRTAB          00000000 43c5bd 000098 00       0   0 1
   [15] .symtab           SYMTAB          00000000 43c900 0166a0 10      16 909 4
   [16] .strtab           STRTAB          00000000 452fa0 0155b7 00       0   0 1
@@ -67,9 +67,9 @@
      8: c00da000     0 SECTION LOCAL  DEFAULT    8
      9: c00e247c     0 SECTION LOCAL  DEFAULT    9
     10: c00e3000     0 SECTION LOCAL  DEFAULT   10
-    11: c00fb64c     0 SECTION LOCAL  DEFAULT   11
-    12: c0441cc0     0 SECTION LOCAL  DEFAULT   12
-    13: c032f400     0 SECTION LOCAL  DEFAULT   13
+    11: 00000000     0 SECTION LOCAL  DEFAULT   11
+    12: 00000000     0 SECTION LOCAL  DEFAULT   12
+    13: 00000000     0 SECTION LOCAL  DEFAULT   13
     14: 00000000     0 SECTION LOCAL  DEFAULT   14
     15: 00000000     0 SECTION LOCAL  DEFAULT   15
     16: 00000000     0 SECTION LOCAL  DEFAULT   16

The change is quite obvious. My question is whether this is expected behaviour 
or if the linker should be changed to provide correct values for the debug
section addresses, even though they are not mentioned in the linkerscript.

In any case I will send a patch to fix the omission in the vmlinux.lds script
to the kernel developers.

Franz.