linux-kernel - [patch] s390: Remove self ptrace IEEE

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Message-Id: <1209546896.10954.28.camel@localhost>
Date:	Wed, 30 Apr 2008 11:14:56 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Cc:	Christoph Hellwig <hch@...radead.org>
Subject: [patch] s390: Remove self ptrace IEEE_IP hack.

From: Martin Schwidefsky <schwidefsky@...ibm.com>

The self referential PT_IEEE_IP ptrace peek & poke calls have been
broken for that last 6 years. For peek the code always returns 0
instead of the last ieee fault and for poke the code does nothing.
Since nobody noticed the code seems to be superfluous. So lets
remove it.

Cc: Christoph Hellwig <hch@...radead.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
---

 arch/s390/kernel/ptrace.c |   20 --------------------
 1 file changed, 20 deletions(-)

diff -urpN linux-2.6/arch/s390/kernel/ptrace.c linux-2.6-patched/arch/s390/kernel/ptrace.c
--- linux-2.6/arch/s390/kernel/ptrace.c	2008-04-30 11:10:46.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/ptrace.c	2008-04-30 11:11:02.000000000 +0200
@@ -607,8 +607,6 @@ do_ptrace_emu31(struct task_struct *chil
 }
 #endif
 
-#define PT32_IEEE_IP 0x13c
-
 static int
 do_ptrace(struct task_struct *child, long request, long addr, long data)
 {
@@ -617,24 +615,6 @@ do_ptrace(struct task_struct *child, lon
 	if (request == PTRACE_ATTACH)
 		return ptrace_attach(child);
 
-	/*
-	 * Special cases to get/store the ieee instructions pointer.
-	 */
-	if (child == current) {
-		if (request == PTRACE_PEEKUSR && addr == PT_IEEE_IP)
-			return peek_user(child, addr, data);
-		if (request == PTRACE_POKEUSR && addr == PT_IEEE_IP)
-			return poke_user(child, addr, data);
-#ifdef CONFIG_COMPAT
-		if (request == PTRACE_PEEKUSR &&
-		    addr == PT32_IEEE_IP && test_thread_flag(TIF_31BIT))
-			return peek_user_emu31(child, addr, data);
-		if (request == PTRACE_POKEUSR &&
-		    addr == PT32_IEEE_IP && test_thread_flag(TIF_31BIT))
-			return poke_user_emu31(child, addr, data);
-#endif
-	}
-
 	ret = ptrace_check_attach(child, request == PTRACE_KILL);
 	if (ret < 0)
 		return ret;


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