kernel/fiasco/src/kern/syscalls-log.cpp

   1 IMPLEMENTATION [log]:
   2
   3 #include <cstring>
   4 #include "config.h"
   5 #include "jdb_trace.h"
   6 #include "jdb_tbuf.h"
   7 #include "types.h"
   8 #include "cpu_lock.h"
   9
  10
  11 /** IPC logging.
  12     called from interrupt gate.
  13  */
  14 extern "C" void sys_ipc_log_wrapper(void)
  15 {
  16   Thread *curr = current_thread();
  17   Entry_frame   *regs      = reinterpret_cast<Entry_frame*>(curr->regs());
  18   Syscall_frame *ipc_regs  = reinterpret_cast<Syscall_frame*>(curr->regs());
  19
  20   Mword entry_event_num    = (Mword)-1;
  21   Unsigned8 have_snd       = (ipc_regs->ref().op() & L4_obj_ref::Ipc_send)
  22                              || (ipc_regs->ref().op() == L4_obj_ref::Ipc_call);
  23   Unsigned8 is_next_period = ipc_regs->next_period();
  24   Utcb *utcb = curr->utcb().access(true);
  25   int do_log               = Jdb_ipc_trace::log() &&
  26                                 Jdb_ipc_trace::check_restriction (curr->dbg_id(),
  27                                          static_cast<Task*>(curr->space())->dbg_id(),
  28                                          ipc_regs, 0);
  29
  30   if (Jdb_nextper_trace::log() && is_next_period)
  31     {
  32       Tb_entry_ipc *tb = static_cast<Tb_entry_ipc*>(Jdb_tbuf::new_entry());
  33       tb->set(curr, regs->ip(), ipc_regs, utcb,
  34               0, curr->sched_context()->left());
  35       Jdb_tbuf::commit_entry();
  36       goto skip_ipc_log;
  37     }
  38
  39   if (do_log)
  40     {
  41       Mword dbg_id;
  42         {
  43           Obj_cap r = ipc_regs->ref();
  44           unsigned char rights;
  45           Kobject_iface *o = r.deref(&rights, true);
  46           if (o)
  47             dbg_id = o->dbg_info()->dbg_id();
  48           else
  49             dbg_id = ~0UL;
  50         }
  51       Tb_entry_ipc _local;
  52       Tb_entry_ipc *tb = EXPECT_TRUE(Jdb_ipc_trace::log_buf())
  53                        ? Jdb_tbuf::new_entry<Tb_entry_ipc>()
  54                        : &_local;
  55       tb->set(curr, regs->ip(), ipc_regs, utcb,
  56               dbg_id, curr->sched_context()->left());
  57
  58       entry_event_num = tb->number();
  59
  60       if (EXPECT_TRUE(Jdb_ipc_trace::log_buf()))
  61         Jdb_tbuf::commit_entry();
  62       else
  63         Jdb_tbuf::direct_log_entry(tb, "IPC");
  64     }
  65
  66 skip_ipc_log:
  67
  68   // now pass control to regular sys_ipc()
  69   sys_ipc_wrapper();
  70
  71   if (Jdb_nextper_trace::log() && is_next_period)
  72     {
  73       Tb_entry_ipc_res *tb =
  74             static_cast<Tb_entry_ipc_res*>(Jdb_tbuf::new_entry());
  75       tb->set(curr, regs->ip(), ipc_regs, utcb, 0,
  76               entry_event_num, have_snd, is_next_period);
  77       Jdb_tbuf::commit_entry();
  78       goto skip_ipc_res_log;
  79     }
  80
  81   if (Jdb_ipc_trace::log() && Jdb_ipc_trace::log_result() && do_log)
  82     {
  83       Tb_entry_ipc_res _local;
  84       Tb_entry_ipc_res *tb = static_cast<Tb_entry_ipc_res*>
  85         (EXPECT_TRUE(Jdb_ipc_trace::log_buf()) ? Jdb_tbuf::new_entry()
  86                                             : &_local);
  87       tb->set(curr, regs->ip(), ipc_regs, utcb, utcb->error.raw(),
  88               entry_event_num, have_snd, is_next_period);
  89
  90       if (EXPECT_TRUE(Jdb_ipc_trace::log_buf()))
  91         Jdb_tbuf::commit_entry();
  92       else
  93         Jdb_tbuf::direct_log_entry(tb, "IPC result");
  94     }
  95
  96 skip_ipc_res_log:
  97   ;
  98 }
  99
 100 /** IPC tracing.
 101  */
 102 extern "C" void sys_ipc_trace_wrapper(void)
 103 {
 104   Thread *curr = current_thread();
 105   Entry_frame *ef      = nonull_static_cast<Entry_frame*>(curr->regs());
 106   Syscall_frame *regs  = curr->regs();
 107
 108   //Mword      from_spec = regs->from_spec();
 109   L4_obj_ref snd_dst   = regs->ref();
 110
 111   Unsigned64 orig_tsc  = Cpu::rdtsc();
 112
 113   // first try the fastpath, then the "slowpath"
 114   sys_ipc_wrapper();
 115
 116   // kernel is locked here => no Lock_guard <...> needed
 117   Tb_entry_ipc_trace *tb =
 118     static_cast<Tb_entry_ipc_trace*>(Jdb_tbuf::new_entry());
 119
 120   tb->set(curr, ef->ip(), orig_tsc, snd_dst, regs->from_spec(),
 121           L4_msg_tag(0,0,0,0), 0, 0);
 122
 123   Jdb_tbuf::commit_entry();
 124 }
 125
 126