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Blackfin: initial tracehook support

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Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger
2010-01-26 07:33:53 +00:00
parent e50e2f25c5
commit e8f263dfd3
6 changed files with 142 additions and 60 deletions
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62
arch/blackfin/kernel/ptrace.c
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@@ -1,6 +1,6 @@
/*
* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
* these modifications are Copyright 2004-2009 Analog Devices Inc.
* these modifications are Copyright 2004-2010 Analog Devices Inc.
*
* Licensed under the GPL-2
*/
@@ -15,6 +15,7 @@
#include <linux/user.h>
#include <linux/regset.h>
#include <linux/signal.h>
#include <linux/tracehook.h>
#include <linux/uaccess.h>
#include <asm/page.h>
@@ -32,25 +33,6 @@
* in exit.c or in signal.c.
*/
/* Find the stack offset for a register, relative to thread.esp0. */
#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
/*
* Get the address of the live pt_regs for the specified task.
* These are saved onto the top kernel stack when the process
* is not running.
*
* Note: if a user thread is execve'd from kernel space, the
* kernel stack will not be empty on entry to the kernel, so
* ptracing these tasks will fail.
*/
static inline struct pt_regs *task_pt_regs(struct task_struct *task)
{
return (struct pt_regs *)
((unsigned long)task_stack_page(task) +
(THREAD_SIZE - sizeof(struct pt_regs)));
}
/*
* Get contents of register REGNO in task TASK.
*/
@@ -234,18 +216,13 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *task)
return &user_bfin_native_view;
}
void ptrace_enable(struct task_struct *child)
void user_enable_single_step(struct task_struct *child)
{
struct pt_regs *regs = task_pt_regs(child);
regs->syscfg |= SYSCFG_SSSTEP;
}
/*
* Called by kernel/ptrace.c when detaching..
*
* Make sure the single step bit is not set.
*/
void ptrace_disable(struct task_struct *child)
void user_disable_single_step(struct task_struct *child)
{
struct pt_regs *regs = task_pt_regs(child);
regs->syscfg &= ~SYSCFG_SSSTEP;
@@ -412,27 +389,18 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
return ret;
}
asmlinkage void syscall_trace(void)
asmlinkage int syscall_trace_enter(struct pt_regs *regs)
{
if (!test_thread_flag(TIF_SYSCALL_TRACE))
return;
int ret = 0;
if (!(current->ptrace & PT_PTRACED))
return;
if (test_thread_flag(TIF_SYSCALL_TRACE))
ret = tracehook_report_syscall_entry(regs);
/* 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
*/
if (current->exit_code) {
send_sig(current->exit_code, current, 1);
current->exit_code = 0;
}
return ret;
}
asmlinkage void syscall_trace_leave(struct pt_regs *regs)
{
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(regs, 0);
}