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[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>
This commit is contained in:
Andi Kleen 2005-04-16 15:25:00 -07:00 committed by Linus Torvalds
parent b957591fee
commit d61915da63
1 changed files with 12 additions and 0 deletions
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12
arch/x86_64/kernel/signal.c
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@ -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 #ifdef CONFIG_IA32_EMULATION
if (test_thread_flag(TIF_IA32)) { if (test_thread_flag(TIF_IA32)) {
if (ka->sa.sa_flags & SA_SIGINFO) if (ka->sa.sa_flags & SA_SIGINFO)