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| author |   Andi Kleen <ak@suse.de> | 2005-04-16 15:25:00 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:25:00 -0700 |
| commit | d61915da63e2ef03d9034e3b2ec7d8cca55d7584 (patch) | |
| tree | 1ce31b822346bb65864813d774a67037c7d3b684 /arch/x86_64/kernel/signal.c | |
| parent | [PATCH] x86_64: Dump stack and prevent recursion on early fault (diff) | |
| download | linux-dev-d61915da63e2ef03d9034e3b2ec7d8cca55d7584.tar.xz linux-dev-d61915da63e2ef03d9034e3b2ec7d8cca55d7584.zip | |
[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>
Diffstat (limited to 'arch/x86_64/kernel/signal.c')
| -rw-r--r-- | arch/x86_64/kernel/signal.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/signal.c b/arch/x86_64/kernel/signal.c index 4ff0f0117a09..7760224cdfe3 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) |