Hello guys. I'm running qemu on x86_64 host. It's clean build from git sources dated 2011.05.19, commit 1fddfba129f5435c80eda14e8bc23fdb888c7187 I have the following output from "log trace,op,out_asm":
Trace 0x4000a310 [d0026c92] OP: ---- 0xd00000c0 movi_i32 tmp1,$0xfffffff4 add_i32 tmp0,ar9,tmp1 qemu_ld32 ar1,tmp0,$0x0 ---- 0xd00000c3 movi_i32 tmp1,$0xfffffff0 add_i32 tmp0,ar9,tmp1 qemu_ld32 ar0,tmp0,$0x0 [...snip...] OUT: [size=664] 0x4000a330: mov 0x2c(%r14),%ebp 0x4000a334: lea -0xc(%rbp),%ebx 0x4000a337: mov %ebx,%esi 0x4000a339: mov %ebx,%edi 0x4000a33b: shr $0x7,%esi 0x4000a33e: and $0xfffff003,%edi 0x4000a344: and $0x1fe0,%esi 0x4000a34a: lea 0x1000(%r14,%rsi,1),%rsi 0x4000a352: cmp (%rsi),%edi 0x4000a354: mov %ebx,%edi 0x4000a356: jne 0x4000a360 0x4000a358: add 0x10(%rsi),%rdi 0x4000a35c: mov (%rdi),%ebp 0x4000a35e: jmp 0x4000a369 0x4000a360: xor %esi,%esi 0x4000a362: callq 0x52edc2 0x4000a367: mov %eax,%ebp 0x4000a369: mov 0x2c(%r14),%ebx 0x4000a36d: lea -0x10(%rbx),%r12d 0x4000a371: mov %ebp,0xc(%r14) 0x4000a375: mov %r12d,%esi 0x4000a378: mov %r12d,%edi [...snip...] Execution of this fragment eventually causes SIGSEGV. In gdb actually generated code for this TB looks like this: (gdb) x/25i 0x4000a330 0x4000a330: mov 0x2c(%r14),%ebp 0x4000a334: lea -0xc(%rbp),%ebx 0x4000a337: mov %ebx,%esi 0x4000a339: mov %ebx,%edi 0x4000a33b: shr $0x7,%esi 0x4000a33e: and $0xfffff003,%edi 0x4000a344: and $0x1fe0,%esi 0x4000a34a: lea 0x3000(%r14,%rsi,1),%rsi 0x4000a352: cmp (%rsi),%edi 0x4000a354: mov %ebx,%edi 0x4000a356: jne 0x4000a360 0x4000a358: add 0x10(%rsi),%rdi 0x4000a35c: mov (%rdi),%ebp 0x4000a35e: jmp 0x4000a36c 0x4000a360: mov $0x1,%esi 0x4000a365: callq 0x52edc2 <__ldl_mmu> 0x4000a36a: mov %eax,%ebp 0x4000a36c: sub $0x44,%al => 0x4000a36e: lea -0x10(%rbx),%esp 0x4000a371: mov %ebp,0xc(%r14) 0x4000a375: mov %r12d,%esi 0x4000a378: mov %r12d,%edi Please note how the current instruction in gdb differ from what was said in OUT. This lea corrupts stack pointer and the next callq generates segfault. Could please anyone familiar with TCG take a look at this, or suggest where I should look myself? Thanks. -- Max
