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Subject[PATCH 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@redhat.com>
Acked-by: Roland McGrath <roland@redhat.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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