linux-kernel - [PATCH 03/17] arm: tracehook_report

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Message-Id: <20090425000842.DDDE3FC3C8@magilla.sf.frob.com>
Date:	Fri, 24 Apr 2009 17:08:42 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Russell King <rmk@....linux.org.uk>
Cc:	Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org
Subject: [PATCH 03/17] arm: tracehook_report_syscall

This makes arm use the standard tracehook_report_syscall_entry()
and tracehook_report_syscall_exit() hooks in <linux/tracehook.h>.

Signed-off-by: Roland McGrath <roland@...hat.com>
---
 arch/arm/kernel/ptrace.c |   22 +++++++++-------------
 1 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 93d7822..effada1 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -14,6 +14,7 @@
 #include <linux/mm.h>
 #include <linux/smp.h>
 #include <linux/ptrace.h>
+#include <linux/tracehook.h>
 #include <linux/user.h>
 #include <linux/security.h>
 #include <linux/init.h>
@@ -811,8 +812,6 @@ asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
 
 	if (!test_thread_flag(TIF_SYSCALL_TRACE))
 		return scno;
-	if (!(current->ptrace & PT_PTRACED))
-		return scno;
 
 	/*
 	 * Save IP.  IP is used to denote syscall entry/exit:
@@ -823,19 +822,16 @@ asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
 
 	current_thread_info()->syscall = scno;
 
-	/* the 0x80 provides a way for the tracing parent to distinguish
-	   between a syscall stop and SIGTRAP delivery */
-	ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
-				 ? 0x80 : 0));
 	/*
-	 * this isn't the same as continuing with a signal, but it will do
-	 * for normal use.  strace only continues with a signal if the
-	 * stopping signal is not SIGTRAP.  -brl
+	 * Report the system call for tracing.  Entry tracing can
+	 * decide to abort the call.  We handle that by setting an
+	 * invalid syscall number (-1) to force an ENOSYS error.
 	 */
-	if (current->exit_code) {
-		send_sig(current->exit_code, current, 1);
-		current->exit_code = 0;
-	}
+	if (why)
+		tracehook_report_syscall_exit(regs, 0);
+	else if (tracehook_report_syscall_entry(regs))
+		current_thread_info()->syscall = -1;
+
 	regs->ARM_ip = ip;
 
 	return current_thread_info()->syscall;
--
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