parisc: stop using task->ptrace for {single,block}step flags

task->ptrace flags belong to generic code, so instead thief some
TIF_ bits to use. Somewhat risky conversion of code to test TASK_FLAGS
instead of TASK_PTRACE in assembly, but it looks alright in the end.

Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>

4 files changed, 25 insertions, 18 deletions

diff --git a/arch/parisc/include/asm/thread_info.h b/arch/parisc/include/asm/thread_info.h
index ac775a76bff7..0399548c5234 100644
--- a/arch/parisc/include/asm/thread_info.h
+++ b/arch/parisc/include/asm/thread_info.h
@@ -60,6 +60,8 @@ struct thread_info {
 #define TIF_RESTORE_SIGMASK     6       /* restore saved signal mask */
 #define TIF_FREEZE              7       /* is freezing for suspend */
 #define TIF_NOTIFY_RESUME       8       /* callback before returning to user */
+#define TIF_SINGLESTEP          9       /* single stepping? */
+#define TIF_BLOCKSTEP           10      /* branch stepping? */
 
 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
@@ -69,6 +71,8 @@ struct thread_info {
 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
 #define _TIF_FREEZE             (1 << TIF_FREEZE)
 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
+#define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
+#define _TIF_BLOCKSTEP          (1 << TIF_BLOCKSTEP)
 
 #define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
                                  _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK)
diff --git a/arch/parisc/kernel/asm-offsets.c b/arch/parisc/kernel/asm-offsets.c
index 699cf8ef2118..fcd3c707bf12 100644
--- a/arch/parisc/kernel/asm-offsets.c
+++ b/arch/parisc/kernel/asm-offsets.c
@@ -270,8 +270,8 @@ int main(void)
         DEFINE(DTLB_OFF_COUNT, offsetof(struct pdc_cache_info, dt_off_count));
         DEFINE(DTLB_LOOP, offsetof(struct pdc_cache_info, dt_loop));
         BLANK();
-        DEFINE(PA_BLOCKSTEP_BIT, 31-PT_BLOCKSTEP_BIT);
-        DEFINE(PA_SINGLESTEP_BIT, 31-PT_SINGLESTEP_BIT);
+        DEFINE(TIF_BLOCKSTEP_PA_BIT, 31-TIF_BLOCKSTEP);
+        DEFINE(TIF_SINGLESTEP_PA_BIT, 31-TIF_SINGLESTEP);
         BLANK();
         DEFINE(ASM_PMD_SHIFT, PMD_SHIFT);
         DEFINE(ASM_PGDIR_SHIFT, PGDIR_SHIFT);
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index 8c4712b74dc1..3a44f7f704fa 100644
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -2047,12 +2047,13 @@ syscall_do_signal:
         b,n     syscall_check_sig
 
 syscall_restore:
-        /* Are we being ptraced? */
         LDREG   TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
 
-        ldw     TASK_PTRACE(%r1), %r19
-        bb,<    %r19,31,syscall_restore_rfi
-        nop
+        /* Are we being ptraced? */
+        ldw     TASK_FLAGS(%r1),%r19
+        ldi     (_TIF_SINGLESTEP|_TIF_BLOCKSTEP),%r2
+        and,COND(=)     %r19,%r2,%r0
+        b,n     syscall_restore_rfi
 
         ldo     TASK_PT_FR31(%r1),%r19             /* reload fpregs */
         rest_fp %r19
@@ -2113,16 +2114,16 @@ syscall_restore_rfi:
         ldi     0x0b,%r20                          /* Create new PSW */
         depi    -1,13,1,%r20                       /* C, Q, D, and I bits */
 
-        /* The values of PA_SINGLESTEP_BIT and PA_BLOCKSTEP_BIT are
-         * set in include/linux/ptrace.h and converted to PA bitmap
+        /* The values of SINGLESTEP_BIT and BLOCKSTEP_BIT are
+         * set in thread_info.h and converted to PA bitmap
          * numbers in asm-offsets.c */
 
-        /* if ((%r19.PA_SINGLESTEP_BIT)) { %r20.27=1} */
-        extru,= %r19,PA_SINGLESTEP_BIT,1,%r0
+        /* if ((%r19.SINGLESTEP_BIT)) { %r20.27=1} */
+        extru,= %r19,TIF_SINGLESTEP_PA_BIT,1,%r0
         depi    -1,27,1,%r20                       /* R bit */
 
-        /* if ((%r19.PA_BLOCKSTEP_BIT)) { %r20.7=1} */
-        extru,= %r19,PA_BLOCKSTEP_BIT,1,%r0
+        /* if ((%r19.BLOCKSTEP_BIT)) { %r20.7=1} */
+        extru,= %r19,TIF_BLOCKSTEP_PA_BIT,1,%r0
         depi    -1,7,1,%r20                        /* T bit */
 
         STREG   %r20,TASK_PT_PSW(%r1)
diff --git a/arch/parisc/kernel/ptrace.c b/arch/parisc/kernel/ptrace.c
index 08f6d2cbf0e0..c4f49e45129d 100644
--- a/arch/parisc/kernel/ptrace.c
+++ b/arch/parisc/kernel/ptrace.c
@@ -36,7 +36,8 @@
  */
 void ptrace_disable(struct task_struct *task)
 {
-        task->ptrace &= ~(PT_SINGLESTEP|PT_BLOCKSTEP);
+        clear_tsk_thread_flag(task, TIF_SINGLESTEP);
+        clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
 
         /* make sure the trap bits are not set */
         pa_psw(task)->r = 0;
@@ -56,8 +57,8 @@ void user_disable_single_step(struct task_struct *task)
 
 void user_enable_single_step(struct task_struct *task)
 {
-        task->ptrace &= ~PT_BLOCKSTEP;
-        task->ptrace |= PT_SINGLESTEP;
+        clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
+        set_tsk_thread_flag(task, TIF_SINGLESTEP);
 
         if (pa_psw(task)->n) {
                 struct siginfo si;
@@ -99,8 +100,8 @@ void user_enable_single_step(struct task_struct *task)
 
 void user_enable_block_step(struct task_struct *task)
 {
-        task->ptrace &= ~PT_SINGLESTEP;
-        task->ptrace |= PT_BLOCKSTEP;
+        clear_tsk_thread_flag(task, TIF_SINGLESTEP);
+        set_tsk_thread_flag(task, TIF_BLOCKSTEP);
 
         /* Enable taken branch trap. */
         pa_psw(task)->r = 0;
@@ -275,7 +276,8 @@ long do_syscall_trace_enter(struct pt_regs *regs)
 
 void do_syscall_trace_exit(struct pt_regs *regs)
 {
-        int stepping = !!(current->ptrace & (PT_SINGLESTEP|PT_BLOCKSTEP));
+        int stepping = test_thread_flag(TIF_SINGLESTEP) ||
+                test_thread_flag(TIF_BLOCKSTEP);
 
         if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))
                 tracehook_report_syscall_exit(regs, stepping);