Blackfin: use generic ptrace_resume code

Use the generic ptrace_resume code for PTRACE_SYSCALL, PTRACE_CONT,
PTRACE_KILL and PTRACE_SINGLESTEP.  This implies defining
arch_has_single_step in <asm/ptrace.h> and implementing the
user_enable_single_step and user_disable_single_step functions, which
also causes the breakpoint information to be cleared on fork, which
could be considered a bug fix.

Also the TIF_SYSCALL_TRACE thread flag is now cleared on PTRACE_KILL
which it previously wasn't which is consistent with all architectures
using the modern ptrace code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/arch/blackfin/kernel/ptrace.c b/arch/blackfin/kernel/ptrace.c
index 65567dc4b9f5a0b1a10c5b5cddafab9bbbc99cc2..895302df21c123ee8747efad37c0ca79ded8bd2f 100644 (file)
--- a/arch/blackfin/kernel/ptrace.c
+++ b/arch/blackfin/kernel/ptrace.c
@@ -354,50 +354,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                ret = put_reg(child, addr, data);
                break;
 
-       case PTRACE_SYSCALL:    /* continue and stop at next (return from) syscall */
-       case PTRACE_CONT:       /* restart after signal. */
-               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;
-               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.
-        * perhaps it should be put in the status that it wants to
-        * exit.
-        */
-       case PTRACE_KILL:
-               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. */
-               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. */
                ret = ptrace_getregs(child, datap);