1 files changed, 21 insertions, 73 deletions

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 388f861b8ed1..24be0cf86d7f 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -160,7 +160,7 @@ syscall_exit:
         mtmsrd  r10,1
         ld      r9,TI_FLAGS(r12)
         li      r11,-_LAST_ERRNO
-        andi.   r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_RESTOREALL|_TIF_SAVE_NVGPRS|_TIF_NOERROR|_TIF_RESTORE_SIGMASK)
+        andi.   r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP|_TIF_USER_WORK_MASK|_TIF_PERSYSCALL_MASK)
         bne-    syscall_exit_work
         cmpld   r3,r11
         ld      r5,_CCR(r1)
@@ -216,8 +216,10 @@ syscall_exit_work:
          If TIF_NOERROR is set, just save r3 as it is. */
 
         andi.   r0,r9,_TIF_RESTOREALL
-        bne-    2f
-        cmpld   r3,r11          /* r10 is -LAST_ERRNO */
+        beq+    0f
+        REST_NVGPRS(r1)
+        b       2f
+0:      cmpld   r3,r11          /* r10 is -LAST_ERRNO */
         blt+    1f
         andi.   r0,r9,_TIF_NOERROR
         bne-    1f
@@ -229,9 +231,7 @@ syscall_exit_work:
 2:      andi.   r0,r9,(_TIF_PERSYSCALL_MASK)
         beq     4f
 
-        /* Clear per-syscall TIF flags if any are set, but _leave_
-        _TIF_SAVE_NVGPRS set in r9 since we haven't dealt with that
-        yet.  */
+        /* Clear per-syscall TIF flags if any are set.  */
 
         li      r11,_TIF_PERSYSCALL_MASK
         addi    r12,r12,TI_FLAGS
@@ -240,10 +240,9 @@ syscall_exit_work:
         stdcx.  r10,0,r12
         bne-    3b
         subi    r12,r12,TI_FLAGS
-        
-4:      bl      .save_nvgprs
-        /* Anything else left to do? */
-        andi.   r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP|_TIF_SAVE_NVGPRS)
+
+4:      /* Anything else left to do? */
+        andi.   r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP)
         beq     .ret_from_except_lite
 
         /* Re-enable interrupts */
@@ -251,26 +250,10 @@ syscall_exit_work:
         ori     r10,r10,MSR_EE
         mtmsrd  r10,1
 
-        andi.   r0,r9,_TIF_SAVE_NVGPRS
-        bne     save_user_nvgprs
-
-        /* If tracing, re-enable interrupts and do it */
-save_user_nvgprs_cont:  
-        andi.   r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP)
-        beq     5f
-        
+        bl      .save_nvgprs
         addi    r3,r1,STACK_FRAME_OVERHEAD
         bl      .do_syscall_trace_leave
-        REST_NVGPRS(r1)
-        clrrdi  r12,r1,THREAD_SHIFT
-
-        /* Disable interrupts again and handle other work if any */
-5:      mfmsr   r10
-        rldicl  r10,r10,48,1
-        rotldi  r10,r10,16
-        mtmsrd  r10,1
-
-        b       .ret_from_except_lite
+        b       .ret_from_except
 
 /* Save non-volatile GPRs, if not already saved. */
 _GLOBAL(save_nvgprs)
@@ -282,51 +265,6 @@ _GLOBAL(save_nvgprs)
         std     r0,_TRAP(r1)
         blr
 
-
-save_user_nvgprs:
-        ld      r10,TI_SIGFRAME(r12)
-        andi.   r0,r9,_TIF_32BIT
-        beq-    save_user_nvgprs_64
-
-        /* 32-bit save to userspace */
-
-.macro savewords start, end
-  1:    stw \start,4*(\start)(r10)
-        .section __ex_table,"a"
-        .align  3
-        .llong  1b,save_user_nvgprs_fault
-        .previous
-        .if \end - \start
-        savewords "(\start+1)",\end
-        .endif
-.endm   
-        savewords 14,31
-        b       save_user_nvgprs_cont
-
-save_user_nvgprs_64:
-        /* 64-bit save to userspace */
-
-.macro savelongs start, end
-  1:    std \start,8*(\start)(r10)
-        .section __ex_table,"a"
-        .align  3
-        .llong  1b,save_user_nvgprs_fault
-        .previous
-        .if \end - \start
-        savelongs "(\start+1)",\end
-        .endif
-.endm   
-        savelongs 14,31
-        b       save_user_nvgprs_cont
-
-save_user_nvgprs_fault:
-        li      r3,11           /* SIGSEGV */
-        ld      r4,TI_TASK(r12)
-        bl      .force_sigsegv
-
-        clrrdi  r12,r1,THREAD_SHIFT
-        ld      r9,TI_FLAGS(r12)
-        b       save_user_nvgprs_cont
         
 /*
  * The sigsuspend and rt_sigsuspend system calls can call do_signal
@@ -352,6 +290,16 @@ _GLOBAL(ppc_clone)
         bl      .sys_clone
         b       syscall_exit
 
+_GLOBAL(ppc32_swapcontext)
+        bl      .save_nvgprs
+        bl      .compat_sys_swapcontext
+        b       syscall_exit
+
+_GLOBAL(ppc64_swapcontext)
+        bl      .save_nvgprs
+        bl      .sys_swapcontext
+        b       syscall_exit
+
 _GLOBAL(ret_from_fork)
         bl      .schedule_tail
         REST_NVGPRS(r1)