[IA64] In ia64_leave_syscall(), fix comments and whitespace only.
David Mosberger-Tang [Thu, 28 Apr 2005 04:18:22 +0000 (21:18 -0700)]
Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/entry.S

index d97a07c..a7542c3 100644 (file)
@@ -625,7 +625,7 @@ END(ia64_ret_from_syscall)
  *           r8-r11: restored (syscall return value(s))
  *              r12: restored (user-level stack pointer)
  *              r13: restored (user-level thread pointer)
- *              r14: cleared
+ *              r14: set to __kernel_syscall_via_epc
  *              r15: restored (syscall #)
  *          r16-r17: cleared
  *              r18: user-level b6
@@ -646,7 +646,7 @@ END(ia64_ret_from_syscall)
  *               pr: restored (user-level pr)
  *               b0: restored (user-level rp)
  *               b6: restored
- *               b7: cleared
+ *               b7: set to __kernel_syscall_via_epc
  *          ar.unat: restored (user-level ar.unat)
  *           ar.pfs: restored (user-level ar.pfs)
  *           ar.rsc: restored (user-level ar.rsc)
@@ -708,63 +708,63 @@ ENTRY(ia64_leave_syscall)
 (pNonSys) break 0              //      bug check: we shouldn't be here if pNonSys is TRUE!
        ;;
        invala                  // M0|1 invalidate ALAT
-       rsm psr.i | psr.ic      // M2 initiate turning off of interrupt and interruption collection
-       cmp.eq p9,p0=r0,r0      // set p9 to indicate that we should restore cr.ifs
+       rsm psr.i | psr.ic      // M2   turn off interrupts and interruption collection
+       cmp.eq p9,p0=r0,r0      // A    set p9 to indicate that we should restore cr.ifs
 
-       ld8 r29=[r2],16         // load cr.ipsr
-       ld8 r28=[r3],16                 // load cr.iip
-       mov r22=r0              // clear r22
+       ld8 r29=[r2],16         // M0|1 load cr.ipsr
+       ld8 r28=[r3],16         // M0|1 load cr.iip
+       mov r22=r0              // A    clear r22
        ;;
        ld8 r30=[r2],16         // M0|1 load cr.ifs
        ld8 r25=[r3],16         // M0|1 load ar.unat
 (pUStk) add r14=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
        ;;
        ld8 r26=[r2],PT(B0)-PT(AR_PFS)  // M0|1 load ar.pfs
-(pKStk)        mov r22=psr             // M2 read PSR now that interrupts are disabled
+(pKStk)        mov r22=psr                     // M2   read PSR now that interrupts are disabled
        nop 0
        ;;
-       ld8 r21=[r2],PT(AR_RNAT)-PT(B0) // load b0
-       ld8 r27=[r3],PT(PR)-PT(AR_RSC)  // load ar.rsc
-       mov f6=f0               // clear f6
+       ld8 r21=[r2],PT(AR_RNAT)-PT(B0) // M0|1 load b0
+       ld8 r27=[r3],PT(PR)-PT(AR_RSC)  // M0|1 load ar.rsc
+       mov f6=f0                       // F    clear f6
        ;;
-       ld8 r24=[r2],PT(AR_FPSR)-PT(AR_RNAT)    // load ar.rnat (may be garbage)
-       ld8 r31=[r3],PT(R1)-PT(PR)              // load predicates
-       mov f7=f0               // clear f7
+       ld8 r24=[r2],PT(AR_FPSR)-PT(AR_RNAT)    // M0|1 load ar.rnat (may be garbage)
+       ld8 r31=[r3],PT(R1)-PT(PR)              // M0|1 load predicates
+       mov f7=f0                               // F    clear f7
        ;;
-       ld8 r20=[r2],PT(R12)-PT(AR_FPSR)        // load ar.fpsr
-       ld8.fill r1=[r3],16     // load r1
-(pUStk) mov r17=1
+       ld8 r20=[r2],PT(R12)-PT(AR_FPSR)        // M0|1 load ar.fpsr
+       ld8.fill r1=[r3],16                     // M0|1 load r1
+(pUStk) mov r17=1                              // A
        ;;
-(pUStk) st1 [r14]=r17
-       ld8.fill r13=[r3],16
-       mov f8=f0               // clear f8
+(pUStk) st1 [r14]=r17                          // M2|3
+       ld8.fill r13=[r3],16                    // M0|1
+       mov f8=f0                               // F    clear f8
        ;;
-       ld8.fill r12=[r2]       // restore r12 (sp)
-       ld8.fill r15=[r3]       // restore r15
-       mov b6=r18              // I0  restore b6
+       ld8.fill r12=[r2]                       // M0|1 restore r12 (sp)
+       ld8.fill r15=[r3]                       // M0|1 restore r15
+       mov b6=r18                              // I0   restore b6
 
-       addl r17=THIS_CPU(ia64_phys_stacked_size_p8),r0
-       mov f9=f0               // clear f9
-(pKStk) br.cond.dpnt.many skip_rbs_switch
+       addl r17=THIS_CPU(ia64_phys_stacked_size_p8),r0 // A
+       mov f9=f0                                       // F    clear f9
+(pKStk) br.cond.dpnt.many skip_rbs_switch              // B
 
-       srlz.d                  // M0  ensure interruption collection is off
-       shr.u r18=r19,16        // I0|1 get byte size of existing "dirty" partition
-       cover                   // B    add current frame into dirty partition and set cr.ifs
+       srlz.d                          // M0   ensure interruption collection is off (for cover)
+       shr.u r18=r19,16                // I0|1 get byte size of existing "dirty" partition
+       cover                           // B    add current frame into dirty partition & set cr.ifs
        ;;
-(pUStk)        ld4 r17=[r17]           // r17 = cpu_data->phys_stacked_size_p8
-       mov r19=ar.bsp          // M2   get new backing store pointer
-       mov f10=f0              // clear f10
+(pUStk) ld4 r17=[r17]                  // M0|1 r17 = cpu_data->phys_stacked_size_p8
+       mov r19=ar.bsp                  // M2   get new backing store pointer
+       mov f10=f0                      // F    clear f10
 
        nop.m 0
-       movl r14=__kernel_syscall_via_epc       // X
+       movl r14=__kernel_syscall_via_epc // X
        ;;
-       mov.m ar.csd=r0         // M2 clear ar.csd
-       mov.m ar.ccv=r0         // clear ar.ccv
-       mov b7=r14              // I0   clear b7 (hint with __kernel_syscall_via_epc)
+       mov.m ar.csd=r0                 // M2   clear ar.csd
+       mov.m ar.ccv=r0                 // M2   clear ar.ccv
+       mov b7=r14                      // I0   clear b7 (hint with __kernel_syscall_via_epc)
 
-       mov.m ar.ssd=r0         // M2 clear ar.ssd
-       mov f11=f0              // clear f11
-       br.cond.sptk.many rbs_switch
+       mov.m ar.ssd=r0                 // M2   clear ar.ssd
+       mov f11=f0                      // F    clear f11
+       br.cond.sptk.many rbs_switch    // B
 END(ia64_leave_syscall)
 
 #ifdef CONFIG_IA32_SUPPORT
@@ -940,7 +940,6 @@ GLOBAL_ENTRY(ia64_leave_kernel)
         * NOTE: alloc, loadrs, and cover can't be predicated.
         */
 (pNonSys) br.cond.dpnt dont_preserve_current_frame
-
        cover                           // add current frame into dirty partition and set cr.ifs
        ;;
        mov r19=ar.bsp                  // get new backing store pointer