You've got a simulated segfault. You're program for some reason is trying to
access memory at address 0. M5 doesn't have a mapping for that page, so it
assumes your program did something wrong and quits. You should try to figure
out why your program is trying to use that address, or if it's not why m5
thinks it is.
Gabe
Quoting SrÄan StipiÄ <[EMAIL PROTECTED]>:
> Hi.
>
> I am trying to implement multi CPU x86 sistem call emulation in M5.
> The idea is that every thread that is created in the program runs on
> it's own CPU,
> so that we don't need any thread scheduling.
>
> The following program runs without the problems with my implementation:
>
> int k = 0;
>
> void f(long a){ k+= a; }
> void g(long a){ k+= a; }
>
> int main(){
> long t1 = create_thread(&f, 5);
> long t2 = create_thread(&g, 6);
> join_thread(t1);
> join_thread(t2);
> printf("%d", k);
> }
>
>
> The implementation that I have wright now is:
>
> I have implemented 3 new system calls in M5:
> create_thread
> join_thread
> stop_thread.
>
> create_thread(f, a):
> - alocates a stack space for new thread
> - and adds the code that will call the stop_thread system call when
> function 'f' returns.
> - sets program counter of the unactive cpu to point to address of 'f'
> - activates inactive cpu
>
> join_thread(t1):
> - waits thread 't1' to be suspended or suspends parent thread
>
> stop_thread():
> - suspends itself.
>
>
> When I run more complex examples that execute 'printf' or 'malloc' in
> child thread,
> the simulator stop executing program with the following error message:
>
> Running clients... panic: Tried to access unmapped address 0.
> @ cycle 132099500
> [invoke:build/X86_SE/arch/x86/faults.cc, line 160]
> Program aborted at cycle 132099500
> Aborted
>
> Can you give me any directions what can be the problem?
>
> (I have the feeling that current sistem call emulation doesn't support
> I/0 that execute from two different thread_conetexts)
>
> Tnx,
> Srdjan
>
> P.S.
> Longer log for the example were child thread calls malloc:
> 127311000: system.cpu2 T0 : @main+280 : CALL_NEAR_I : stupd
> t7, SS:[rsp + 0xfffffffffffffff8] : MemWrite : D=0x00007fffffffeaa8
> A=0x7fffffffeaa8
> 127311500: system.cpu2 T0 : @main+280 : CALL_NEAR_I : wrip ,
> t7, t1 : IntAlu :
> 127312000: system.cpu2 T0 : @create_thread : PUSH_R : stupd rbp,
> SS:[rsp + 0xfffffffffffffff8] : MemWrite : D=0x00007fffffffeaa0
> A=0x7fffffffeaa0
> 127312500: system.cpu2 T0 : @create_thread+1 : MOV_R_R : mov rbp,
> rbp, rsp : IntAlu : D=0x00007fffffffeaa0
> 127313000: system.cpu2 T0 : @create_thread+4 : SUB_R_I : limm t1,
> 0x20 : IntAlu : D=0x0000000000000020
> 127313500: system.cpu2 T0 : @create_thread+4 : SUB_R_I : sub rsp,
> rsp, t1 : IntAlu : D=0x000000000000002c
> 127314000: system.cpu2 T0 : @create_thread+8 : MOV_M_R : st rdi,
> SS:[rbp + 0xffffffffffffffe8] : MemWrite : D=0x00000000004005ea
> A=0x7fffffffea88
> 127314500: system.cpu2 T0 : @create_thread+12 : MOV_M_R : st
> rsi, SS:[rbp + 0xffffffffffffffe0] : MemWrite : D=0x0000000000d91c28
> A=0x7fffffffea80
> 127315500: system.cpu2 T0 : @create_thread+16 : MOV_R_I : limm
> eax, 0x111 : IntAlu : D=0x0000000000000111
> 127316000: system.cpu2 T0 : @create_thread+21 : MOV_R_M : ld
> rdi, SS:[rbp + 0xffffffffffffffe8] : MemRead : D=0x00000000004005ea
> A=0x7fffffffea88
> 127317000: system.cpu2 T0 : @create_thread+25 : MOV_R_M : ld
> rsi, SS:[rbp + 0xffffffffffffffe0] : MemRead : D=0x0000000000d91c28
> A=0x7fffffffea80
> 127317500: system.cpu2 T0 : @create_thread+29 : syscall eax
> : IntAlu :
> 127318000: system.cpu2 T0 : @create_thread+31 : MOV_M_R : st
> rax, SS:[rbp + 0xfffffffffffffff8] : MemWrite : D=0x0000000000cbb0d0
> A=0x7fffffffea98
> 127318500: system.cpu0 T0 : @client_run : PUSH_R : stupd rbp,
> SS:[rsp + 0xfffffffffffffff8] : MemWrite : D=0x00002aaaaabacfe9
> A=0x2aaaaabacfe9
> 127319000: system.cpu2 T0 : @create_thread+35 : MOV_R_M : ld
> rax, SS:[rbp + 0xfffffffffffffff8] : MemRead : D=0x0000000000cbb0d0
> A=0x7fffffffea98
> 127319000: system.cpu0 T0 : @client_run+1 : MOV_R_R : mov rbp,
> rbp, rsp : IntAlu : D=0x00002aaaaabacfe9
> ....
> ....
> 127339500: system.cpu2 T0 : @main+355 : CMP_R_M : sub t0,
> rax, t1 : IntAlu : D=0x00000000000000b9
> 127340000: system.cpu2 T0 : @main+359 : JL_I : rdip t1,
> %ctrl153, : IntAlu : D=0x000000000040367e
> 127340000: system.cpu0 T0 : @malloc+22 : MOV_R_P : ld rax,
> DS:[t7 + 0x16fcab] : MemRead : D=0x0000000000000000 A=0x58a848
> 127340500: system.cpu0 T0 : @malloc+29 : TEST_R_R : and t0,
> rax, rax : IntAlu : D=0x0000000000000050
> 127340500: system.cpu2 T0 : @main+359 : JL_I : limm t2,
> 0xffffffffffffffda : IntAlu : D=0xffffffffffffffda
> 127341000: system.cpu2 T0 : @main+359 : JL_I : wrip , t1, t2
> : IntAlu :
> 127341000: system.cpu0 T0 : @malloc+32 : JZ_I : rdip t1,
> %ctrl153, : IntAlu : D=0x000000000041aba2
> 127341500: system.cpu0 T0 : @malloc+32 : JZ_I : limm t2, 0x1e
> : IntAlu : D=0x000000000000001e
> 127341500: system.cpu2 T0 : @main+323 : MOV_R_M : ld eax,
> SS:[rbp + 0xffffffffffffffe4] : MemRead : D=0x0000000000000000
> A=0x7fffffffeb34
> 127342000: system.cpu2 T0 : @main+326 : MOV_R_M : ld rdx,
> SS:[rbp + 0xffffffffffffffc8] : MemRead : D=0x00007fffffffeab0
> A=0x7fffffffeb18
> 127342000: system.cpu0 T0 : @malloc+32 : JZ_I : wrip , t1, t2
> : IntAlu :
> 127343000: system.cpu2 T0 : @main+330 : CDQE_R : sexti rax,
> rax, 0x1f : IntAlu : D=0x0000000000000000
> END
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