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authorFrederic Weisbecker <fweisbec@gmail.com>2010-06-24 21:21:27 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2010-06-24 23:35:15 +0200
commit0c4519e825c9e2b6a8310deff8582f8c35bfbba9 (patch)
treeed56729d5281b7fec606efd3d617f84d24d18a6c /arch/x86/kernel/hw_breakpoint.c
parent5cfaf214856eb934759ae500a0b812dd06a00bd9 (diff)
x86: Set resume bit before returning from breakpoint exception
Instruction breakpoints trigger before the instruction executes, and returning back from the breakpoint handler brings us again to the instruction that breakpointed. This naturally bring to a breakpoint recursion. To solve this, x86 has the Resume Bit trick. When the cpu flags have the RF flag set, the next instruction won't trigger any instruction breakpoint, and once this instruction is executed, RF is cleared back. This let's us jump back to the instruction that triggered the breakpoint without recursion. Use this when an instruction breakpoint triggers. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Prasad <prasad@linux.vnet.ibm.com> Cc: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'arch/x86/kernel/hw_breakpoint.c')
-rw-r--r--arch/x86/kernel/hw_breakpoint.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c
index a8f1b803d2fd..eaa6ae2a010b 100644
--- a/arch/x86/kernel/hw_breakpoint.c
+++ b/arch/x86/kernel/hw_breakpoint.c
@@ -466,6 +466,13 @@ static int __kprobes hw_breakpoint_handler(struct die_args *args)
perf_bp_event(bp, args->regs);
+ /*
+ * Set up resume flag to avoid breakpoint recursion when
+ * returning back to origin.
+ */
+ if (bp->hw.info.type == X86_BREAKPOINT_EXECUTE)
+ args->regs->flags |= X86_EFLAGS_RF;
+
rcu_read_unlock();
}
/*