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Date: Mon, 05 Mar 2007 15:24:00 +0800
From: "Wu, Bryan" <bryan.wu@...log.com>
To: Andrew Morton <akpm@...ux-foundation.org>, roland@...hat.com,
linux-kernel@...r.kernel.org
Subject: [PATCH -mm] Blackfin: blackfin utrace patch
Hi folks,
As utrace is very promising in the -mm tree, a simple support is added
to blackfin architecture. I send this patch out just for review and it
is only a start point, we will make it fully work in the future.
Now after applying this patch, the blackfin-arch can be compile in the
2.6.21-rc2-mm1 with utrace enabled and ptrace disabled.
[PATCH -mm] Blackfin: blackfin utrace patch
This patch adds support utrace in blackfin architecture.
Signed-off-by: Bryan Wu <bryan.wu@...log.com>
---
arch/blackfin/kernel/asm-offsets.c | 2
arch/blackfin/kernel/ptrace.c | 8 +++
include/asm-blackfin/thread_info.h | 2
include/asm-blackfin/tracehook.h | 79 +++++++++++++++++++++++++++++++++++++
4 files changed, 91 insertions(+)
diff -uprN linux-2.6-orig/arch/blackfin/kernel/asm-offsets.c linux-2.6/arch/blackfin/kernel/asm-offsets.c
--- linux-2.6-orig/arch/blackfin/kernel/asm-offsets.c 2007-03-05 11:50:21.000000000 +0800
+++ linux-2.6/arch/blackfin/kernel/asm-offsets.c 2007-03-05 11:57:23.000000000 +0800
@@ -45,7 +45,9 @@ int main(void)
/* offsets into the task struct */
DEFINE(TASK_STATE, offsetof(struct task_struct, state));
DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags));
+#if 0
DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace));
+#endif
DEFINE(TASK_BLOCKED, offsetof(struct task_struct, blocked));
DEFINE(TASK_THREAD, offsetof(struct task_struct, thread));
DEFINE(TASK_THREAD_INFO, offsetof(struct task_struct, thread_info));
diff -uprN linux-2.6-orig/arch/blackfin/kernel/ptrace.c linux-2.6/arch/blackfin/kernel/ptrace.c
--- linux-2.6-orig/arch/blackfin/kernel/ptrace.c 2007-03-05 11:50:21.000000000 +0800
+++ linux-2.6/arch/blackfin/kernel/ptrace.c 2007-03-05 11:57:23.000000000 +0800
@@ -34,12 +34,14 @@
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
+#include <linux/tracehook.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/signal.h>
#include <asm/uaccess.h>
+#include <asm/tracehook.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
@@ -173,6 +175,8 @@ static inline int is_user_addr_valid(str
return -EIO;
}
+#ifdef CONFIG_PTRACE
+
/*
* Called by kernel/ptrace.c when detaching..
*
@@ -386,12 +390,15 @@ long arch_ptrace(struct task_struct *chi
return ret;
}
+#endif /* CONFIG_PTRACE */
+
asmlinkage void syscall_trace(void)
{
if (!test_thread_flag(TIF_SYSCALL_TRACE))
return;
+#if 0
if (!(current->ptrace & PT_PTRACED))
return;
@@ -400,6 +407,7 @@ asmlinkage void syscall_trace(void)
*/
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
? 0x80 : 0));
+#endif
/*
* this isn't the same as continuing with a signal, but it will do
diff -uprN linux-2.6-orig/include/asm-blackfin/thread_info.h linux-2.6/include/asm-blackfin/thread_info.h
--- linux-2.6-orig/include/asm-blackfin/thread_info.h 2007-03-05 11:50:22.000000000 +0800
+++ linux-2.6/include/asm-blackfin/thread_info.h 2007-03-05 11:57:23.000000000 +0800
@@ -127,6 +127,7 @@ static inline struct thread_info *curren
#define TIF_MEMDIE 5
#define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
#define TIF_FREEZE 7 /* is freezing for suspend */
+#define TIF_SINGLESTEP 8 /* restore singlestep on return to user mode */
/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
@@ -136,6 +137,7 @@ static inline struct thread_info *curren
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
#define _TIF_FREEZE (1<<TIF_FREEZE)
+#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
diff -uprN linux-2.6-orig/include/asm-blackfin/tracehook.h linux-2.6/include/asm-blackfin/tracehook.h
--- linux-2.6-orig/include/asm-blackfin/tracehook.h 1970-01-01 08:00:00.000000000 +0800
+++ linux-2.6/include/asm-blackfin/tracehook.h 2007-03-05 11:57:23.000000000 +0800
@@ -0,0 +1,79 @@
+/*
+ * Tracing hooks, Blackfin Architecture support
+ *
+ * Copyright (C) 2006, 2007 Analog Devices, Inc. All rights reserved.
+ * Copyright (C) 2006, 2007 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ *
+ * ADI Author: Bryan Wu
+ * Red Hat Author: Roland McGrath.
+ */
+
+#ifndef _ASM_TRACEHOOK_H
+#define _ASM_TRACEHOOK_H 1
+
+#include <linux/sched.h>
+#include <asm/ptrace.h>
+
+/*
+ * See linux/tracehook.h for the descriptions of what these need to do.
+ */
+
+#define ARCH_HAS_SINGLE_STEP (1)
+
+static inline void tracehook_enable_single_step(struct task_struct *task)
+{
+ /* TODO */
+#if 0
+ struct pt_regs *regs = task->thread.regs;
+
+ if (regs != NULL) {
+ }
+#endif
+ set_tsk_thread_flag(task, TIF_SINGLESTEP);
+}
+
+static inline void tracehook_disable_single_step(struct task_struct *task)
+{
+ /* TODO */
+#if 0
+ struct pt_regs *regs = task->thread.regs;
+
+ if (regs != NULL) {
+ }
+#endif
+ clear_tsk_thread_flag(task, TIF_SINGLESTEP);
+}
+
+
+static inline int tracehook_single_step_enabled(struct task_struct *tsk)
+{
+ return test_tsk_thread_flag(tsk, TIF_SINGLESTEP);
+}
+
+static inline void tracehook_enable_syscall_trace(struct task_struct *tsk)
+{
+ set_tsk_thread_flag(tsk, TIF_SYSCALL_TRACE);
+}
+
+static inline void tracehook_disable_syscall_trace(struct task_struct *tsk)
+{
+ clear_tsk_thread_flag(tsk, TIF_SYSCALL_TRACE);
+}
+
+static inline void tracehook_abort_syscall(struct pt_regs *regs)
+{
+ regs->orig_r0 = -1;
+}
+
+extern const struct utrace_regset_view utrace_bfin_native;
+static inline const struct utrace_regset_view *
+utrace_native_view(struct task_struct *tsk)
+{
+ return &utrace_bfin_native;
+}
+
+#endif
_
Thanks
-Bryan Wu
-
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