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[Qemu-devel] [Bug 1429841] Re: error "rom: requested regions overlap" fo

From: Peter Maydell
Subject: [Qemu-devel] [Bug 1429841] Re: error "rom: requested regions overlap" for NOLOAD sections
Date: Fri, 03 Nov 2017 17:14:13 -0000

This bug is fixed in QEMU master by commits bf1733392ca2 and
f33e5e6299288c, which will be in the upcoming QEMU 2.11 release.

(PS: the thing the loader cares about is not elf sections but elf
segments in the program header, so the section table and its attributes
isn't relevant here, only the program header. In any case your example
ELF file loads OK with the bugfixes applied.)

** Changed in: qemu
       Status: New => Fix Committed

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  error "rom: requested regions overlap" for NOLOAD sections

Status in QEMU:
  Fix Committed

Bug description:
  command line:
  qemu-system-arm -semihosting -nographic -monitor null -serial null -no-reboot 
-kernel build/fw/0HNFcomSLuP1_CUNIT.elf

  rom: requested regions overlap (rom phdr #6: build/fw/0HNFcomSLuP1_CUNIT.elf. 
free=0x8001effc, addr=0x8001c000)
  rom loading failed

  I checked the sections of the .elf file with arm-none-eabi-objdump -h:
  Idx Name          Size      VMA       LMA       File off  Algn
   35 .marker_appli 00001000  801ae000  801ae000  00025000  2**0
   36 .safe_data    00000014  80200000  8001b000  00020000  2**2
                    CONTENTS, ALLOC, LOAD, DATA
   37 .safe_bss     00000488  80200020  8001b020  00020014  2**2
   38 .marker_safe_data 00001000  80201000  8001c000  00029000  2**0
   39 .data         000008cc  80202000  8001b600  00022000  2**3
                    CONTENTS, ALLOC, LOAD, DATA
   40 .bss          0000312c  802028d0  8001bed0  000228cc  2**3
   41 .marker_data  00001000  80206000  8001f600  00026000  2**0
   42 .cunit        00010000  80300000  80119600  00028000  2**0
   43 .marker_code  00001000  8001c000  8001c000  00024000  2**0

  So I had a look where the values in  the error message could come from:
  0x8001c000: is the "LMA" value of section .marker_safe_data
  0x8001effc: is "Size" + "LMA" of the .bss section (0x0000312c + 0x8001bed0)

  So it is correct that (regarding the "LMA" value) the .marker_safe_data 
section collides with .bss section.
  But actually these sections have no "LOAD" attribute, so I would guess that 
their "LMA" should not be used anyway.
  Those section should reside at their "VMA" addresses (0x802xxxxx) during 
runtime but they have no data to load.

  Or am I getting something completely wrong?
  Should I give an additional option to qemu?

  I got this error with 2.0.0+dfsg-2ubuntu1.10 and 1.0.50-2012.03-0ubuntu2.1
  I didn't get this error (but others) with 0.10.2

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