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[Qemu-devel] A strange segmentation fault
From: |
Heng Yin |
Subject: |
[Qemu-devel] A strange segmentation fault |
Date: |
Tue, 05 Dec 2006 16:47:35 -0000 |
User-agent: |
Thunderbird 1.5.0.8 (X11/20061025) |
Hi Qemu developers,
I'm running into a strange problem, when I do some implementation on Qemu.
In target_i386/op.c, if I add a function call in the following function,
Qemu will crash immediately after execution.
void OPPROTO op_jnz_T0_label(void)
{
helper_test(T0); //this is the function I add
if (T0)
GOTO_LABEL_PARAM(1);
FORCE_RET();
}
I define this function in target_i386/helper.c:
int helper_test(int a)
{
return a*3;
}
However, if my function takes no arguments, qemu works well.
void OPPROTO op_jnz_T0_label(void)
{
helper_test(); //this is the function I add
if (T0)
GOTO_LABEL_PARAM(1);
FORCE_RET();
}
I define this function in target_i386/helper.c:
int helper_test()
{
return 100+cpu_single_env;
}
I built qemu on linux, and tested it on 0.8.0 and 0.8.2, and the problem
appeared on both versions. I also tried to load winxp and linux images
with three different options for kqemu: -kernel-kqemu -no-kqemu (none),
and nothing is changed.
Below is the message I got in gdb:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1212746048 (LWP 5587)]
0x00000001 in ?? ()
(gdb) bt
#0 0x00000001 in ?? ()
#1 0x080bac6c in cpu_x86_exec (env1=0x40) at
/home/hyin/qemu-0.8.2/cpu-exec.c:772
#2 0x08050a62 in main_loop () at /home/hyin/qemu-0.8.2/vl.c:5069
#3 0x08051fe2 in main (argc=3324, argv=0x8) at
/home/hyin/qemu-0.8.2/vl.c:6221
Can you guys give any idea of what may cause this problem and how to
solve it?
Thanks,
Heng
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