diff options
| author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-11-09 21:03:43 +0100 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2009-11-10 11:23:05 +0100 |
| commit | 9f6b3c2c30cfbb1166ce7e74a8f9fd93ae19d2de (patch) | |
| tree | 1144b1c516327765c7daacc6f4b23cc606a0c013 /arch/x86/kernel/hw_breakpoint.c | |
| parent | ksym_tracer: Support read accesses independent of read/write. (diff) | |
| download | linux-9f6b3c2c30cfbb1166ce7e74a8f9fd93ae19d2de.tar.xz linux-9f6b3c2c30cfbb1166ce7e74a8f9fd93ae19d2de.zip | |
hw-breakpoints: Fix broken a.out format dump
Fix the broken a.out format dump. For now we only dump the ptrace
breakpoints.
TODO: Dump every perf breakpoints for the current thread, not only
ptrace based ones.
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
Diffstat (limited to 'arch/x86/kernel/hw_breakpoint.c')
| -rw-r--r-- | arch/x86/kernel/hw_breakpoint.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c index e622620790bd..57dcee5fa958 100644 --- a/arch/x86/kernel/hw_breakpoint.c +++ b/arch/x86/kernel/hw_breakpoint.c @@ -376,6 +376,41 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp, } /* + * Dump the debug register contents to the user. + * We can't dump our per cpu values because it + * may contain cpu wide breakpoint, something that + * doesn't belong to the current task. + * + * TODO: include non-ptrace user breakpoints (perf) + */ +void aout_dump_debugregs(struct user *dump) +{ + int i; + int dr7 = 0; + struct perf_event *bp; + struct arch_hw_breakpoint *info; + struct thread_struct *thread = ¤t->thread; + + for (i = 0; i < HBP_NUM; i++) { + bp = thread->ptrace_bps[i]; + + if (bp && !bp->attr.disabled) { + dump->u_debugreg[i] = bp->attr.bp_addr; + info = counter_arch_bp(bp); + dr7 |= encode_dr7(i, info->len, info->type); + } else { + dump->u_debugreg[i] = 0; + } + } + + dump->u_debugreg[4] = 0; + dump->u_debugreg[5] = 0; + dump->u_debugreg[6] = current->thread.debugreg6; + + dump->u_debugreg[7] = dr7; +} + +/* * Release the user breakpoints used by ptrace */ void flush_ptrace_hw_breakpoint(struct task_struct *tsk) |