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Blackfin arch: use existing ptrace_disable() func to clear TRACE_BITS and create the opposite ptrace_enable() 

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Mike Frysinger 2008-10-09 15:21:05 +08:00 committed by Bryan Wu
parent d3ab3a62f5
commit cb4c173d94
1 changed files with 37 additions and 50 deletions
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87
arch/blackfin/kernel/ptrace.c
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@ -175,6 +175,13 @@ static inline int is_user_addr_valid(struct task_struct *child,
return -EIO;
}
void ptrace_enable(struct task_struct *child)
{
unsigned long tmp;
tmp = get_reg(child, PT_SYSCFG) | (TRACE_BITS);
put_reg(child, PT_SYSCFG, tmp);
}
/*
* Called by kernel/ptrace.c when detaching..
*
@ -347,29 +354,22 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
break;
case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
case PTRACE_CONT:
{ /* restart after signal. */
long tmp;
case PTRACE_CONT: /* restart after signal. */
pr_debug("ptrace: syscall/cont\n");
pr_debug("ptrace: syscall/cont\n");
ret = -EIO;
if (!valid_signal(data))
break;
if (request == PTRACE_SYSCALL)
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
else
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
/* make sure the single step bit is not set. */
tmp = get_reg(child, PT_SYSCFG) & ~(TRACE_BITS);
put_reg(child, PT_SYSCFG, tmp);
pr_debug("ptrace: before wake_up_process\n");
wake_up_process(child);
ret = 0;
ret = -EIO;
if (!valid_signal(data))
break;
}
if (request == PTRACE_SYSCALL)
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
else
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
ptrace_disable(child);
pr_debug("ptrace: before wake_up_process\n");
wake_up_process(child);
ret = 0;
break;
/*
* make the child exit. Best I can do is send it a sigkill.
@ -377,38 +377,25 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
* exit.
*/
case PTRACE_KILL:
{
long tmp;
ret = 0;
if (child->exit_state == EXIT_ZOMBIE) /* already dead */
break;
child->exit_code = SIGKILL;
/* make sure the single step bit is not set. */
tmp = get_reg(child, PT_SYSCFG) & ~(TRACE_BITS);
put_reg(child, PT_SYSCFG, tmp);
wake_up_process(child);
ret = 0;
if (child->exit_state == EXIT_ZOMBIE) /* already dead */
break;
}
child->exit_code = SIGKILL;
ptrace_disable(child);
wake_up_process(child);
break;
case PTRACE_SINGLESTEP:
{ /* set the trap flag. */
long tmp;
pr_debug("ptrace: single step\n");
ret = -EIO;
if (!valid_signal(data))
break;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
tmp = get_reg(child, PT_SYSCFG) | (TRACE_BITS);
put_reg(child, PT_SYSCFG, tmp);
child->exit_code = data;
/* give it a chance to run. */
wake_up_process(child);
ret = 0;
case PTRACE_SINGLESTEP: /* set the trap flag. */
pr_debug("ptrace: single step\n");
ret = -EIO;
if (!valid_signal(data))
break;
}
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
ptrace_enable(child);
child->exit_code = data;
wake_up_process(child);
ret = 0;
break;
case PTRACE_GETREGS:
/* Get all gp regs from the child. */