函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\debug\debug_core.c Create Date:2022-07-27 12:41:50
Last Modify:2020-03-17 19:04:10 Copyright©Brick
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函数名称：kgdb_cpu_enter

函数原型：static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs, int exception_state)

返回类型：int

参数：

类型参数名称
struct kgdb_state *ks
struct pt_regs *regs
intexception_state
560  sstep_tries等于100
563  trace_on等于0
564  online_cpus等于num_online_cpus()
567  enter_kgdb自加
568  exception_state或等于exception_state
570  如果exception_state恒等于Waiting to become a master kgdb cpu 则atomic_inc( & We use NR_CPUs not PERCPU, in case kgdb is used to debug early* bootup code (which might not have percpu set up yet):)
572  否则atomic_inc( & slaves_in_kgdb)
575  如果disable_hw_break则disable_hw_break(regs)
578  acquirelock :
583  local_irq_save(flags)
585  cpu等于cpu
586  debuggerinfo等于regs
587  task等于当前进程
588  ret_state等于0
589  irq_depth等于hardirq_count()右移HARDIRQ_SHIFT位
592  smp_mb()
594  如果Guard for recursive entry 恒等于1则
595  如果Define the various spin_lock methods. Note we define these* regardless of whether CONFIG_SMP or CONFIG_PREEMPTION are set. The* various methods are defined as nops in the case they are not* required.( & dbg_master_lock)则atomic_xchg( & The CPU# of the active CPU, or -1 if none:, cpu)
597  转到:cpu_master_loop
604  当1循环
605  cpu_loop :
606  如果exception_state按位与Transition from one master cpu to another 则
607  exception_state与等于Transition from one master cpu to another 的反
608  转到:cpu_master_loop
609  否则如果exception_state按位与Waiting to become a master kgdb cpu 则
610  如果Define the various spin_lock methods. Note we define these* regardless of whether CONFIG_SMP or CONFIG_PREEMPTION are set. The* various methods are defined as nops in the case they are not* required.( & dbg_master_lock)则
614  否则如果exception_state按位与Slave cpu should backtrace then clear flag 则
615  dump_stack()
616  exception_state与等于Slave cpu should backtrace then clear flag 的反
617  否则如果exception_state按位与Slave cpu enter exception 则
618  如果非raw_spin_is_locked( & dbg_slave_lock)则转到:return_normal
620  否则
621  return_normal :
625  如果correct_hw_break则correct_hw_break()
627  如果trace_on则tracing_on()
629  debuggerinfo = NULL
630  task = NULL
631  exception_state与等于Waiting to become a master kgdb cpu 按位或Slave cpu enter exception 的值的反
633  enter_kgdb自减
634  smp_mb__before_atomic()
635  atomic_dec( & slaves_in_kgdb)
636  dbg_touch_watchdogs()
637  local_irq_restore(flags)
638  返回:0
640  cpu_relax()
649  如果atomic_read( & keep track of the CPU which is doing the single stepping)不等于负1且task且进程ID不等于kgdb_sstep_pid且sstep_tries先自减则
652  atomic_set( & The CPU# of the active CPU, or -1 if none:, - 1)
653  raw_spin_unlock( & dbg_master_lock)
654  dbg_touch_watchdogs()
655  local_irq_restore(flags)
657  转到:acquirelock
660  如果非Return true if there is a valid kgdb I/O module则
661  ret_state等于1
662  转到:kgdb_restore
668  如果kgdb_skipexception - Bail out of KGDB when we've been triggered则转到:kgdb_restore
672  如果pre_exception则pre_exception()
679  如果非kgdb_single_step则raw_spin_lock( & dbg_slave_lock)
695  time_left等于Parameters used to convert the timespec values:
696  当If you are debugging a problem where roundup (the collection of* all other CPUs) is a problem [this should be extremely rare],* then use the nokgdbroundup option to avoid roundup且time_left先自减且atomic_read( & We use NR_CPUs not PERCPU, in case kgdb is used to debug early* bootup code (which might not have percpu set up yet):)加atomic_read( & slaves_in_kgdb)不等于online_cpus循环
699  0x10c7 is 2**32 / 1000000 (rounded up) (1000)
700  如果非time_left则打印错误信息("Timed out waiting for secondary CPUs.\n")
707  dbg_deactivate_sw_breakpoints()
708  kgdb_single_step等于0
709  kgdb_contthread等于当前进程
710  Guard for recursive entry 等于0
711  trace_on等于tracing_is_on()
712  如果trace_on则tracing_off()
715  当1循环
716  cpu_master_loop :
717  如果Use kdb or gdbserver mode 则
718  kgdb_connected - Is a host GDB connected to us?等于1
719  error等于kdb_stub(ks)
720  如果error恒等于负1则继续下一循环
722  kgdb_connected - Is a host GDB connected to us?等于0
723  否则
724  error等于This function performs all gdbserial command procesing
727  如果error恒等于stub return value for switching between the gdbstub and kdb 则
728  Use kdb or gdbserver mode 等于非Use kdb or gdbserver mode
729  否则如果error恒等于Switch from one cpu to another 则
730  exception_state或等于Transition from one master cpu to another
732  转到:cpu_loop
733  否则
734  ret_state等于error
735  退出
740  如果post_exception则post_exception()
743  如果非kgdb_single_step则
744  raw_spin_unlock( & dbg_slave_lock)
746  当If you are debugging a problem where roundup (the collection of* all other CPUs) is a problem [this should be extremely rare],* then use the nokgdbroundup option to avoid roundup且atomic_read( & slaves_in_kgdb)循环
747  cpu_relax()
750  kgdb_restore :
751  如果atomic_read( & keep track of the CPU which is doing the single stepping)不等于负1则
752  sstep_cpu等于atomic_read( & keep track of the CPU which is doing the single stepping)
753  如果task则kgdb_sstep_pid等于进程ID
755  否则kgdb_sstep_pid等于0
758  如果correct_hw_break则correct_hw_break()
760  如果trace_on则tracing_on()
763  debuggerinfo = NULL
764  task = NULL
765  exception_state与等于Waiting to become a master kgdb cpu 按位或Slave cpu enter exception 的值的反
767  enter_kgdb自减
768  smp_mb__before_atomic()
769  atomic_dec( & We use NR_CPUs not PERCPU, in case kgdb is used to debug early* bootup code (which might not have percpu set up yet):)
771  atomic_set( & The CPU# of the active CPU, or -1 if none:, - 1)
772  raw_spin_unlock( & dbg_master_lock)
773  dbg_touch_watchdogs()
774  local_irq_restore(flags)
776  返回:ret_state
调用者
名称描述
kgdb_handle_exceptionkgdb_handle_exception() - main entry point from a kernel exception* Locking hierarchy:* interface locks, if any (begin_session)* kgdb lock (kgdb_active)