um: 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.

XXX: I'm not sure arch_has_single_step() is placed in the exactly correct
location, please verify in which of the ptrace headers it should really
be.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 18 insertions, 54 deletions

diff --git a/arch/um/include/asm/ptrace-generic.h b/arch/um/include/asm/ptrace-generic.h
index 6c8899013c92..2cd899f75a3c 100644
--- a/arch/um/include/asm/ptrace-generic.h
+++ b/arch/um/include/asm/ptrace-generic.h
@@ -16,6 +16,8 @@ struct pt_regs {
         struct uml_pt_regs regs;
 };
 
+#define arch_has_single_step()  (1)
+
 #define EMPTY_REGS { .regs = EMPTY_UML_PT_REGS }
 
 #define PT_REGS_IP(r) UPT_IP(&(r)->regs)
diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c
index 8e3d69e4fcb5..484509948ee9 100644
--- a/arch/um/kernel/ptrace.c
+++ b/arch/um/kernel/ptrace.c
@@ -12,16 +12,25 @@
 #endif
 #include "skas_ptrace.h"
 
-static inline void set_singlestepping(struct task_struct *child, int on)
+
+
+void user_enable_single_step(struct task_struct *child)
 {
-        if (on)
-                child->ptrace |= PT_DTRACE;
-        else
-                child->ptrace &= ~PT_DTRACE;
+        child->ptrace |= PT_DTRACE;
         child->thread.singlestep_syscall = 0;
 
 #ifdef SUBARCH_SET_SINGLESTEPPING
-        SUBARCH_SET_SINGLESTEPPING(child, on);
+        SUBARCH_SET_SINGLESTEPPING(child, 1);
+#endif
+}
+
+void user_disable_single_step(struct task_struct *child)
+{
+        child->ptrace &= ~PT_DTRACE;
+        child->thread.singlestep_syscall = 0;
+
+#ifdef SUBARCH_SET_SINGLESTEPPING
+        SUBARCH_SET_SINGLESTEPPING(child, 0);
 #endif
 }
 
@@ -30,7 +39,7 @@ static inline void set_singlestepping(struct task_struct *child, int on)
  */
 void ptrace_disable(struct task_struct *child)
 {
-        set_singlestepping(child,0);
+        user_disable_single_step(child);
 }
 
 extern int peek_user(struct task_struct * child, long addr, long data);
@@ -69,53 +78,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                 ret = -EIO;
                 break;
 
-        /* continue and stop at next (return from) syscall */
-        case PTRACE_SYSCALL:
-        /* restart after signal. */
-        case PTRACE_CONT: {
-                ret = -EIO;
-                if (!valid_signal(data))
-                        break;
-
-                set_singlestepping(child, 0);
-                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;
-                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;
-
-                set_singlestepping(child, 0);
-                child->exit_code = SIGKILL;
-                wake_up_process(child);
-                break;
-        }
-
-        case PTRACE_SINGLESTEP: {  /* set the trap flag. */
-                ret = -EIO;
-                if (!valid_signal(data))
-                        break;
-                clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
-                set_singlestepping(child, 1);
-                child->exit_code = data;
-                /* give it a chance to run. */
-                wake_up_process(child);
-                ret = 0;
-                break;
-        }
-
 #ifdef PTRACE_GETREGS
         case PTRACE_GETREGS: { /* Get all gp regs from the child. */
                 if (!access_ok(VERIFY_WRITE, p, MAX_REG_OFFSET)) {