linux-kernel - [PATCH v2 1/5] ptrace: introduce user_single_step

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Message-ID: <20091112173844.GA12264@redhat.com>
Date:	Thu, 12 Nov 2009 18:38:44 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Roland McGrath <roland@...hat.com>,
	Srinivasa Ds <srinivasa@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/5] 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.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Acked-by: Roland McGrath <roland@...hat.com>
---

 include/linux/ptrace.h |   12 ++++++++++++
 1 file changed, 12 insertions(+)

--- TH/include/linux/ptrace.h~1_DEFAULT_HELPER	2009-11-10 01:03:24.000000000 +0100
+++ TH/include/linux/ptrace.h	2009-11-10 21:31:25.000000000 +0100
@@ -273,6 +273,18 @@ static inline void user_enable_block_ste
 }
 #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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