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ptrace: x86: implement user_single_step_siginfo()

PATCH In review Oleg Nesterov 1 participant 1 message Nov 12, 2009

Subsystems (3)
x86 Generic include/asm header files ptrace support
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Oleg Nesterov

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PATCH v2 4/5 ptrace: x86: implement user_single_step_siginfo()

Suggested by Roland.

Implement user_single_step_siginfo() for x86. Extract this code from send_sigtrap().

Since x86 calls tracehook_report_syscall_exit(step => 0) the new helper is not used yet.

Signed-off-by Oleg Nesterov <[email protected]>
Acked-by Roland McGrath <[email protected]>

---

 arch/x86/include/asm/ptrace.h |    2 ++
 arch/x86/kernel/ptrace.c      |   30 +++++++++++++++++++++---------
 2 files changed, 23 insertions(+), 9 deletions(-)
arch/x86/include/asm/ptrace.h renamed from arch/x86/include/asm/ptrace.h~4_X86_HELPER +2 -0
@@ -230,6 +230,8 @@ extern void user_enable_block_step(struc
 #define arch_has_block_step()	(boot_cpu_data.x86 >= 6)
 #endif
 
+#define ARCH_HAS_USER_SINGLE_STEP_INFO
+
 struct user_desc;
 extern int do_get_thread_area(struct task_struct *p, int idx,
 			      struct user_desc __user *info);
arch/x86/kernel/ptrace.c renamed from arch/x86/kernel/ptrace.c~4_X86_HELPER +21 -9
@@ -1437,21 +1437,33 @@ const struct user_regset_view *task_user
 #endif
 }
 
-void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
-					 int error_code, int si_code)
+static void fill_sigtrap_info(struct task_struct *tsk,
+				struct pt_regs *regs,
+				int error_code, int si_code,
+				struct siginfo *info)
 {
-	struct siginfo info;
-
 	tsk->thread.trap_no = 1;
 	tsk->thread.error_code = error_code;
 
-	memset(&info, 0, sizeof(info));
-	info.si_signo = SIGTRAP;
-	info.si_code = si_code;
+	memset(info, 0, sizeof(*info));
+	info->si_signo = SIGTRAP;
+	info->si_code = si_code;
+	info->si_addr = user_mode_vm(regs) ? (void __user *)regs->ip : NULL;
+}
 
-	/* User-mode ip? */
-	info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL;
+void user_single_step_siginfo(struct task_struct *tsk,
+				struct pt_regs *regs,
+				struct siginfo *info)
+{
+	fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info);
+}
 
+void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
+					 int error_code, int si_code)
+{
+	struct siginfo info;
+
+	fill_sigtrap_info(tsk, regs, error_code, si_code, &info);
 	/* Send us the fake SIGTRAP */
 	force_sig_info(SIGTRAP, &info, tsk);
 }