[Gems-users] The process to get pid and related questions

[Weihang Jiang <weihang.jiang@xxxxxxxxx>]

The process to get pid from inside simulator:

1. find the break address using mdb in the simulation machine
   mdb -k
2. find the instruction that modified the pid "stx ... [%l0 + 0x10]"
   >::dis resume    (see attachment)
   can't not find "stx ... [%l0 + 0x10]", instead, I pick
"resume+0xa8:                   
stx       %o0, [%i1 + 0x10]"
3. find the starting address of the function "resume"
   > resume=X
              102da90 
  now the starting address of resume + offset is the break point = 0x102da90 + 0xa8 = 0x102db38
4. ./simics -c xxx.check
    break 0x102db38
    c
    @cpu = SIM_current_processor()
    @cwp = SIM_read_register(cpu, SIM_get_register_number(cpu, "cwp"))
    @va = SIM_get_interface(cpu, "sparc-v9").read_window_register(cpu, cwp, 25) + 0x10
    @pa = SIM_logical_to_physical(cpu, Sim_DI_Data, va)
    @print pa 
    output:  50331664 (0x3000010 )  (this is thread_physical_addr)
    
5.  @SIM_breakpoint(SIM_get_object ("phys_mem0"),Sim_Break_Physical,Sim_Access_Write,0x3000010,4,0)
     c
     
6. @thread = SIM_read_phys_memory(conf.cpu0, 0x3000010,8)
    (thread = 2890513120576)
    @procp= SIM_read_phys_memory(conf.cpu0, SIM_logical_to_physical(conf.cpu0,Sim_DI_Data,thread+0x130),8)
    (procp = 21012480)
    @pidp= SIM_read_phys_memory(conf.cpu0, SIM_logical_to_physical(conf.cpu0,Sim_DI_Data,procp+0xb0),8)
    (pidp = 21451608)
    @pid= SIM_read_phys_memory(conf.cpu0, SIM_logical_to_physical(conf.cpu0,Sim_DI_Data,pidp+0x4),4)
    (pid = 1)

    The problem is that the pid is always equal to "1"
(never changed). Can anyone point out where I made mistake?
    
-- 
Weihang Jiang