From: akpm@osdl.org
To: torvalds@osdl.org
Cc: linux-kernel@vger.kernel.org, akpm@osdl.org, ak@suse.de
Subject: [patch 079/198] x86_64: Fix interaction of single stepping with debuggers
Date: Tue, 12 Apr 2005 03:31:48 -0700 [thread overview]
Message-ID: <200504121031.j3CAVs8E005443@shell0.pdx.osdl.net> (raw)
From: "Andi Kleen" <ak@suse.de>
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>
---
25-akpm/arch/x86_64/kernel/signal.c | 12 ++++++++++++
1 files changed, 12 insertions(+)
diff -puN arch/x86_64/kernel/signal.c~x86_64-fix-interaction-of-single-stepping-with-debuggers arch/x86_64/kernel/signal.c
--- 25/arch/x86_64/kernel/signal.c~x86_64-fix-interaction-of-single-stepping-with-debuggers 2005-04-12 03:21:22.220758832 -0700
+++ 25-akpm/arch/x86_64/kernel/signal.c 2005-04-12 03:21:22.223758376 -0700
@@ -368,6 +368,18 @@ handle_signal(unsigned long sig, siginfo
}
}
+ /*
+ * 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)
_
reply other threads:[~2005-04-12 19:43 UTC|newest]
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