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authorOleg Nesterov <oleg@redhat.com>2009-12-15 16:47:17 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 07:20:08 -0800
commit85ec7fd9f8e528c4f61d595cfe4df7681a19f252 (patch)
tree67c81a68f3302f02b6f769b9acede7efeb5edc8e
parent6580807da14c423f0d0a708108e6df6ebc8bc83d (diff)
downloadop-kernel-dev-85ec7fd9f8e528c4f61d595cfe4df7681a19f252.zip
op-kernel-dev-85ec7fd9f8e528c4f61d595cfe4df7681a19f252.tar.gz
ptrace: introduce user_single_step_siginfo() helper
Suggested by Roland. Currently there is no way to synthesize a single-stepping trap in the arch-independent manner. This patch adds the default helper which fills siginfo_t, arch/ can can override it. Architetures which implement user_enable_single_step() should add user_single_step_siginfo() also. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Roland McGrath <roland@redhat.com> Cc: <linux-arch@vger.kernel.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/ptrace.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 1951805..56f2d63 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -273,6 +273,18 @@ static inline void user_enable_block_step(struct task_struct *task)
}
#endif /* arch_has_block_step */
+#ifdef ARCH_HAS_USER_SINGLE_STEP_INFO
+extern void user_single_step_siginfo(struct task_struct *tsk,
+ struct pt_regs *regs, siginfo_t *info);
+#else
+static inline void user_single_step_siginfo(struct task_struct *tsk,
+ struct pt_regs *regs, siginfo_t *info)
+{
+ memset(info, 0, sizeof(*info));
+ info->si_signo = SIGTRAP;
+}
+#endif
+
#ifndef arch_ptrace_stop_needed
/**
* arch_ptrace_stop_needed - Decide whether arch_ptrace_stop() should be called
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