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RE: [Qemu-devel] Support for new target emulator

From: Boyapati, Anitha
Subject: RE: [Qemu-devel] Support for new target emulator
Date: Tue, 24 Nov 2009 13:02:22 +0100

> -----Original Message-----
> From: Rabin Vincent [mailto:address@hidden On Behalf Of Rabin
> Vincent

Hello Rabin,

> I've put up the current source at http://repo.or.cz/w/qemu/avr32.git,
> and a small README and some prebuilt kernel and busybox binaries to play
> with at http://rab.in/qemu/avr32/.
> Current status and a TODO list are below.  Have a look.  I still hope to
> complete this and get it merged at some point, but you're welcome to
> beat me to it.  If you (or anyone else) decide to work off this, I'd
> be happy to take patches or give you push access to the repo.
> Current status:
> - linux-user: Busybox (ash, ls, gzip, etc) works.

I am playing around the code downloaded from git repo and tried something like 
the following in linux-user mode:

$ qemu-avr32 a.out

[a.out is a simple elf file created using avr32-gcc by compiling a file 
containing a blank main()].


int main() {
        return 0;

I get an error "mmap: Invalid argument". The same behavior can be seen for all 
elf programs (as simple as a blank main function). Not sure what I expected, 
but definitely not an error. This kind of execution is important for providing 
gdb support.

Further analysis shows that the error directly narrows down to target_mmap in 
mmap.c. The check for offset and target_page_mask fails for stack segment 
mapping and results in this error. Any idea why this happened? Let me know your 
insights on this issue.

Some more info about helloworld using readelf:

Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  LOAD           0x000400 0x00000000 0x00000000 0x07a8c 0x07a90 RWE 0x400
  LOAD           0x008000 0x24000000 0x00007a90 0x00848 0x00848 RW  0x400
  LOAD           0x008848 0x24000848 0x24000848 0x00000 0x00050 RW  0x400
  LOAD           0x008c00 0x24007000 0x24007000 0x00000 0x01000 RW  0x400

 Section to Segment mapping:
  Segment Sections...
   00     .reset .init .text .fini .rodata .dalign 
   01     .ctors .dtors .jcr .got .data 
   02     .bss 
   03     .stack


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