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authorFrederic Weisbecker <fweisbec@gmail.com>2009-11-09 21:03:43 +0100
committerFrederic Weisbecker <fweisbec@gmail.com>2009-11-10 11:23:05 +0100
commit9f6b3c2c30cfbb1166ce7e74a8f9fd93ae19d2de (patch)
tree1144b1c516327765c7daacc6f4b23cc606a0c013 /arch/x86/kernel/hw_breakpoint.c
parent676c0dbe6e514fdd8e434a9e623c781aa9b40b15 (diff)
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.c35
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 = &current->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)