Re: [Qemu-devel] 32bit emulation in x86_64 System emulation

[Mario Goppold <mgoppold@tbz-pariv.de>]

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Today I found out that the output of nm and ldd for both are identical. The 
binaries are exchangeable. In other words the compiler produces the same 
output. And here are the diffs between the strace calls (as attachment).

What else can I do? Any suggestions?

Mario 
 

Am Donnerstag, 27. Oktober 2005 08:37 schrieb Mario Goppold:
> Hi list,
>
> I've tried to install SuSE92 x68_64 as guest (qemu 0.7.2 with and without
> kqemu). During the install grub terminates with core. But not only grub
> terminates:
>
>   #include <stdio.h>
>   int main() {
>     printf("Hallo Welt!\n");
>     return 0;
>   }
>
>   gcc a.c ; ./a.out is ok but
>   gcc -m32 a.c; ./a.out Segmentation fault (core dumped)
>
> with gdb:
>   Core was generated by `./a.out'.
>   Program terminated with signal 11, Segmentation fault.
>
>   warning: current_sos: Can't read pathname for load map: Input/output
> error
>
>   Reading symbols from /lib/tls/libc.so.6...done.
>   Loaded symbols for /lib/tls/libc.so.6
>   Reading symbols from /lib/ld-linux.so.2...done.
>   Loaded symbols for /lib/ld-linux.so.2
>   #0  0x5568aff4 in ?? () from /lib/tls/libc.so.6
>   (gdb) where
>   #0  0x5568aff4 in ?? () from /lib/tls/libc.so.6
>   #1  0x555d4bf3 in _IO_file_stat_internal () from /lib/tls/libc.so.6
>   #2  0x555d4bf3 in _IO_file_stat_internal () from /lib/tls/libc.so.6
>   #3  0x555ca494 in _IO_file_doallocate_internal () from /lib/tls/libc.so.6
>   #4  0x555d77be in _IO_doallocbuf_internal () from /lib/tls/libc.so.6
>   #5  0x555d550a in _IO_new_file_overflow () from /lib/tls/libc.so.6
>   #6  0x555d49fd in _IO_new_file_xsputn () from /lib/tls/libc.so.6
>   #7  0x555b25e8 in vfprintf () from /lib/tls/libc.so.6
>   #8  0x555ba7b0 in printf () from /lib/tls/libc.so.6
>   #9  0x080483e0 in main () at a.c:4
>
> What's worng? Outside of qemu it works fine.
> In the meantime i've found out that's not (only) a SuSE problem:
>
> SuSE92, SuSE93, SuSE10, FC4 fails but Ubuntu 5.10 works fine (all in
> x86_64).
>
> Have anyone see this behaviour. What can i do?
>
> Mario
>
>
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> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel

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--- qemu.suse92.strace.out	2005-10-28 12:12:47.318635137 +0200
+++ suse92.strace.out	2005-10-28 11:36:06.664647905 +0200
@@ -1,14 +1,14 @@
 execve("./a.out", ["./a.out"], [/* 42 vars */]) = 0
-uname({sys="Linux", node="SuSE92x86-64", ...}) = 0
+uname({sys="Linux", node="linux", ...}) = 0
 brk(0)                                  = 0x804a000
 access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
 open("/etc/ld.so.cache", O_RDONLY)      = 3
-fstat64(0x3, 0xffffcdb8)                = 0
-old_mmap(0x5c3e00000000, 8589934593, PROT_READ|PROT_WRITE, 0xf /* MAP_??? */|MAP_FIXED|MAP_ANONYMOUS|MAP_NORESERVE|MAP_POPULATE|MAP_NONBLOCK|MAP_GROWSDOWN|MAP_DENYWRITE|MAP_EXECUTABLE|MAP_LOCKED|0xfffe06c0, 770, 0xa9c000000000) = 0x5556d000
+fstat64(0x3, 0xffffcdc8)                = 0
+old_mmap(0x5ccc00000000, 8589934593, PROT_READ|PROT_WRITE, 0xf /* MAP_??? */|MAP_FIXED|MAP_ANONYMOUS|MAP_NORESERVE|MAP_POPULATE|MAP_NONBLOCK|MAP_GROWSDOWN|MAP_DENYWRITE|MAP_EXECUTABLE|MAP_LOCKED|0xfffe06c0, 2051, 0xb08600000000) = 0x5556d000
 close(3)                                = 0
 open("/lib/tls/libc.so.6", O_RDONLY)    = 3
 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\0L\1\000"..., 512) = 512
-fstat64(0x3, 0xffffce30)                = 0
+fstat64(0x3, 0xffffce40)                = 0
 old_mmap(0x115c2c00000000, 8804682956805, PROT_READ|PROT_WRITE, MAP_FILE, 0, 0) = 0x55573000
 madvise(0x55573000, 1137708, MADV_SEQUENTIAL|0x1) = 0
 mprotect(0x55682000, 27692, PROT_NONE)  = 0
@@ -17,9 +17,12 @@
 close(3)                                = 0
 old_mmap(0x100000000000, 146028888067, PROT_READ|PROT_WRITE|PROT_EXEC|PROT_SEM|PROT_GROWSDOWN|PROT_GROWSUP|0xfcfffff0, 0xc /* MAP_??? */|MAP_ANONYMOUS|MAP_POPULATE|MAP_GROWSDOWN|MAP_DENYWRITE|MAP_EXECUTABLE|MAP_LOCKED|0x555606c0, 16, 0x855565d95) = 0x55689000
 mprotect(0x55683000, 4096, PROT_READ)   = 0
-set_thread_area(0xffffd448)             = 0
-munmap(0x5556d000, 23614)               = 0
---- SIGSEGV (Segmentation fault) @ 0 (0) ---
-+++ killed by SIGSEGV +++
-[ Process PID=2231 runs in 32 bit mode. ]
-[ Process PID=2231 runs in 64 bit mode. ]
+set_thread_area(0xffffd458)             = 0
+munmap(0x5556d000, 23756)               = 0
+fstat64(0x1, 0xffffcfe8)                = 0
+mmap2(NULL, 4096, PROT_READ|PROT_WRITE, 0x3 /* MAP_??? */, 34, 0xffffffff) = 0x5556d000
+write(1, "Hallo Welt!\n", 12Hallo Welt!
+)           = 12
+munmap(0x5556d000, 4096)                = 0
+exit_group(0)                           = ?
+[ Process PID=4693 runs in 32 bit mode. ]