hw_breakpoint_handler

Name:Handle debug exception notifications.* Return value is either NOTIFY_STOP or NOTIFY_DONE as explained below.* NOTIFY_DONE returned if one of the following conditions is true.* i) When the causative address is from user-space and the exception

Proto:static int hw_breakpoint_handler(struct die_args *args)

Type:int

Parameter:

Type	Parameter	Name
struct die_args *	args

440

rc = Clean way to return from the notifier and stop further calls.

446

dr6_p = ERR_PTR(err)

447

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If dr6 & single-step Then Return Don't care

454

If (dr6 & DR_TRAP_BITS) == 0 Then Return Don't care

457

These special macros can be used to get or set a debugging register(dr7, 7)

459

set_debugreg(0UL, 7)

465

debugreg6 &= ~DR_TRAP_BITS

466

cpu = get_cpu()

469

When i < Total number of available HW breakpoint registers cycle

470

If Value is more likely to compile time(!(dr6 & (db0 << i))) Then Continue

479

_read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other

481

bp = per_cpu(Stores the breakpoints currently in use on each breakpoint address* register for each cpus[i], cpu)

486

dr6_p &= ~(db0 << i)

491

If Not bp Then

492

_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

493

Break

496

perf_bp_event(bp, regs)

502

If type == rigger on instruction execute Then flags |= X86_EFLAGS_RF

505

_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

512

If debugreg6 & DR_TRAP_BITS || dr6 & ~DR_TRAP_BITS Then rc = Don't care

516

set_debugreg(dr7, 7)

517

519

Return rc

**Caller**
Name	Describe
hw_breakpoint_exceptions_notify	Handle debug exception notifications.

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