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authorAndi Kleen <ak@suse.de>2005-04-16 15:25:00 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:25:00 -0700
commitd61915da63e2ef03d9034e3b2ec7d8cca55d7584 (patch)
tree1ce31b822346bb65864813d774a67037c7d3b684
parentb957591fee753101f289615abab1c54ff7b1d29d (diff)
downloadop-kernel-dev-d61915da63e2ef03d9034e3b2ec7d8cca55d7584.zip
op-kernel-dev-d61915da63e2ef03d9034e3b2ec7d8cca55d7584.tar.gz
[PATCH] x86_64: Fix interaction of single stepping with debuggers
Ported from i386/Linus Fix another TF corner case. Need to do the special TF handling for all signals to make debuggers happy Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/x86_64/kernel/signal.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/signal.c b/arch/x86_64/kernel/signal.c
index 4ff0f01..7760224 100644
--- a/arch/x86_64/kernel/signal.c
+++ b/arch/x86_64/kernel/signal.c
@@ -368,6 +368,18 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
}
}
+ /*
+ * If TF is set due to a debugger (PT_DTRACE), clear the TF
+ * flag so that register information in the sigcontext is
+ * correct.
+ */
+ if (unlikely(regs->eflags & TF_MASK)) {
+ if (likely(current->ptrace & PT_DTRACE)) {
+ current->ptrace &= ~PT_DTRACE;
+ regs->eflags &= ~TF_MASK;
+ }
+ }
+
#ifdef CONFIG_IA32_EMULATION
if (test_thread_flag(TIF_IA32)) {
if (ka->sa.sa_flags & SA_SIGINFO)
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