Re: [Qemu-devel] Run program without kernel. Possible? (part 2)

[Luis Pureza]

Hi,

I think you got it right. I compiled a small test program on linux/x86 using a cross compiler that generates sparc binaries.

Then I tried to emulate it (still on linux/x86) using

$ qemu-sparc -d in_asm program

and it starts emulating but then fails:

Unhandled trap: 0x2
pc: 40002bac  npc: 40002bb0
General Registers:
%g0: 00000000   %g1: 40002bac   %g2: 00000000   %g3: 00000000

%g4: 40002800   %g5: 00000000   %g6: 00000000   %g7: 00000000
Current Register Window:
%o0: 00000000   %o1: 00000000   %o2: 00000000   %o3: 00000000
%o4: 00000000   %o5: 00000000   %o6: b7dbb2a0   %o7: 40002b00

%l0: 00000000   %l1: 00000000   %l2: 00000000   %l3: 00000000
%l4: 00000000   %l5: 00000000   %l6: 00000000   %l7: 00000000
%i0: 00000000   %i1: 00000000   %i2: 00000000   %i3: 00000000
%i4: 00000000   %i5: 00000000   %i6: 00000000   %i7: 00000000

Floating Point Registers:
<All 0>
psr: 0x04000000 -> ---- --- wim: 0x00000001
fsr: 0x00000000

According to the SPARC manual that is an illegal instruction trap. The log contains:

##########################################################
start    end      size     prot
40000000-40004000 00004000 rwx
b7d76000-b7df6000 00080000 rw-
b7df6000-b7df7000 00001000 ---
start_brk   0x40003adc
end_code    0x400038c4
start_code  0x40000000
end_data    0x400038c4
start_stack 0xb7df52e0
brk         0x40003adc
entry       0x40000000
--------------
IN:
0x40000000:  mov  %g0, %g4
0x40000004:  sethi  %hi(0x40002800), %g4
0x40000008:  jmp  %g4 + 0x2f8   ! 0x40002af8
0x4000000c:  nop

--------------
IN:
0x40002af8:  sethi  %hi(0x40002800), %g1
0x40002afc:  or  %g1, 0x3ac, %g1        ! 0x40002bac
0x40002b00:  call  %g1
0x40002b04:  nop

--------------

IN:
0x40002bac:  rd  %psr, %l3
##########################################################
This last instruction seems to be completely legal, so I don't really know what's happening...
The source for the program is in attachment.

Thanks for your help.

Luís Pureza

P.S.: By the way, every time I tried qemu-i386 using examples from the official documentation, it failed with this error:

cannot set up thread-local storage: set_thread_area failed when setting up thread-local storage

Seems to be something related to my glibc. My problem?

On 7/18/06, Johannes Schindelin <address@hidden> wrote:

Hi,

Yes. To a certain extent: If you run x86 linux, and you want to execute a
program for PPC linux, you can use the usermode emulation (-user).

Unfortunately, this is only possible if you run Linux _and_ the program is
for Linux (on another CPU).

If you want to do this for Darwin, you might be lucky with the usermode
emulation of darwine (which is not yet merged with mainstream QEmu,
unfortunately).

Maybe you want to ask in a more precise fashion what you want to achieve?

Ciao,
Dscho



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teste3.c
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