[Qemu-devel] SMP cpu_index error on X86_64

[陳正芬]

Hi : 

     I want to get  the value of cpu_index into a variable in translate-all.c, and pass the variable to a function in /tcg/i386/tcg-target.c.

     It works fine on X86_32(Host) with ARM11MPCore(Guest).  ARM11 single core also emulates fine on x86_64.

     However, I emulate ARM11MPCore (-smp 2), it show the "Segmentation fault" error.
                        
     Works:

• HOST- x86_32    GUEST- ARM11MPCore (1 core~4 core) 
• HOST- x86_64    GUEST- ARM11MPCore (1 core)

     Failed:

• HOST- x86_64    GUEST- ARM11MPCore (2 core~4 core)

    These are the error messages and gdb debug info :

Program received signal SIGSEGV, Segmentation fault.
0x0000000040c4551b in ?? ()
(gdb) bt
#0  0x0000000040c4551b in ?? ()
#1  0x00007fffffffdca0 in ?? ()
#2  0x000000000052dd4f in tcg_out_modrm_offset (s=Cannot access memory at address 0x6c00654d)
    at /home/sue7785/qemu-0.15.1/tcg/i386/tcg-target.c:581
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb) x/20i 0x0000000040c4551b
=> 0x40c4551b:  mov    %ebx,0x4(%rsi)
   0x40c4551e:  mov    %ebp,0x14(%r14)
   0x40c45522:  callq  0x54a242 <helper_sub_cc>
   0x40c45527:  mov    0xc4(%r14),%ebp
   0x40c4552e:  test   %ebp,%ebp
   0x40c45530:  jne    0x40c45580
   0x40c45536:  push   %rdi
   0x40c45537:  push   %rsi
   0x40c45538:  push   %rdx
   0x40c45539:  push   %rcx
   0x40c4553a:  push   %r8
   0x40c4553c:  push   %r9
   0x40c4553e:  push   %rax
   0x40c4553f:  push   %rbx
   0x40c45540:  mov    $0x1,%edi
   0x40c45545:  mov    $0x40017588,%esi
   0x40c4554a:  mov    $0xb,%edx
   0x40c4554f:  mov    $0x10,%ecx
   0x40c45554:  callq  0x52d49a <trace_tb2>
   0x40c45559:  pop    %rbx

Thanks in advance,

Regards,

Meg