[Qemu-devel] [PATCH, RFC] BSD user emulator

[Blue Swirl]

Hi,

This is a preliminary implementation of BSD user emulator. Some files
inside bsd-user contain a lot of unwanted cruft copied from linux-user
and ldscript is not used. But it can already run a handcrafted Sparc64
helloworld file (on OpenBSD/Sparc64 host):

LD_BIND_NOW=y ./qemu-sparc64 -d in_asm -strace ../helloworld.sparc64_obsd
write(1,0x2001f8,13)Hello World!
 = 13
exit(13)

cat /tmp/qemu.log
start    end      size     prot
00100000-00102000 00002000 r-x
00200000-00202000 00002000 r--
00300000-00302000 00002000 rw-
00700000-00702000 00002000 rw-
40000000-40080000 00080000 rw-
40080000-40082000 00002000 ---
40d32000-40d3a000 00008000 ---
418e8000-418f0000 00008000 ---
41b84000-41b8c000 00008000 ---
4325a000-43262000 00008000 ---
4357c000-4357e000 00002000 ---
436ca000-436d2000 00008000 ---
43758000-43760000 00008000 ---
44202000-4420a000 00008000 ---
44dce000-44dd6000 00008000 ---
4643e000-46448000 0000a000 ---
466da000-466e2000 00008000 ---
467d0000-467d8000 00008000 ---
48492000-4849a000 00008000 ---
487b0000-487b8000 00008000 ---
48e8a000-48e92000 00008000 ---
49136000-4913e000 00008000 ---
4941a000-49422000 00008000 ---
494ec000-494ee000 00002000 ---
498b4000-498bc000 00008000 ---
4a950000-4a958000 00008000 ---
4ade4000-4adec000 00008000 ---
4bae8000-4baf0000 00008000 ---
4bb86000-4bb88000 00002000 ---
4d542000-4d55c000 0001a000 ---
4df92000-4df9a000 00008000 ---
4e10a000-4e112000 00008000 ---
4e212000-4e21a000 00008000 ---
4eaca000-4ead2000 00008000 ---
4f392000-4f39a000 00008000 ---
4f4ae000-4f4b6000 00008000 ---
4f6da000-4f6e2000 00008000 ---
500ba000-544bc000 04402000 ---
start_brk   0x0000000000700208
end_code    0x00000000001001f8
start_code  0x0000000000100000
start_data  0x0000000000700208
end_data    0x0000000000700208
start_stack 0x000000004007fb70
brk         0x0000000000700208
entry       0x00000000001001c8
--------------
IN:
0x00000000001001c8:  mov  0xd, %o2
0x00000000001001cc:  sethi  %hi(0), %o0
0x00000000001001d0:  sethi  %hi(0x200000), %o1
0x00000000001001d4:  mov  %o0, %o0
0x00000000001001d8:  or  %o1, 0x1f8, %o1
0x00000000001001dc:  sllx  %o0, 0x20, %o0
0x00000000001001e0:  or  %o1, %o0, %o1
0x00000000001001e4:  mov  1, %o0
0x00000000001001e8:  mov  4, %g1
0x00000000001001ec:  ta  0

--------------
IN:
0x00000000001001f0:  mov  1, %g1
0x00000000001001f4:  ta  0

I think in BSD (at least OpenBSD), system call numbers, system call
parameters, ioctls, and signal numbers are shared across
architectures, maybe even between *BSDs. If it's true, it should make
the emulator much simpler than Linux one.

bsd_user_emu.diff.bz2
Description: BZip2 compressed data