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-rw-r--r--arch/ia64/kernel/entry.S92
1 files changed, 82 insertions, 10 deletions
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index 3c331c464b4..ca2bb95726d 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -570,6 +570,7 @@ GLOBAL_ENTRY(ia64_trace_syscall)
br.call.sptk.many rp=syscall_trace_leave // give parent a chance to catch return value
.ret3:
(pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk
+(pUStk) rsm psr.i // disable interrupts
br.cond.sptk .work_pending_syscall_end
strace_error:
@@ -710,6 +711,16 @@ ENTRY(ia64_leave_syscall)
(pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk
#endif
.work_processed_syscall:
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ adds r2=PT(LOADRS)+16,r12
+(pUStk) mov.m r22=ar.itc // fetch time at leave
+ adds r18=TI_FLAGS+IA64_TASK_SIZE,r13
+ ;;
+(p6) ld4 r31=[r18] // load current_thread_info()->flags
+ ld8 r19=[r2],PT(B6)-PT(LOADRS) // load ar.rsc value for "loadrs"
+ adds r3=PT(AR_BSPSTORE)+16,r12 // deferred
+ ;;
+#else
adds r2=PT(LOADRS)+16,r12
adds r3=PT(AR_BSPSTORE)+16,r12
adds r18=TI_FLAGS+IA64_TASK_SIZE,r13
@@ -718,6 +729,7 @@ ENTRY(ia64_leave_syscall)
ld8 r19=[r2],PT(B6)-PT(LOADRS) // load ar.rsc value for "loadrs"
nop.i 0
;;
+#endif
mov r16=ar.bsp // M2 get existing backing store pointer
ld8 r18=[r2],PT(R9)-PT(B6) // load b6
(p6) and r15=TIF_WORK_MASK,r31 // any work other than TIF_SYSCALL_TRACE?
@@ -737,12 +749,21 @@ ENTRY(ia64_leave_syscall)
ld8 r29=[r2],16 // M0|1 load cr.ipsr
ld8 r28=[r3],16 // M0|1 load cr.iip
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+(pUStk) add r14=TI_AC_LEAVE+IA64_TASK_SIZE,r13
+ ;;
+ ld8 r30=[r2],16 // M0|1 load cr.ifs
+ ld8 r25=[r3],16 // M0|1 load ar.unat
+(pUStk) add r15=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
+ ;;
+#else
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
;;
+#endif
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
nop 0
@@ -759,7 +780,11 @@ ENTRY(ia64_leave_syscall)
ld8.fill r1=[r3],16 // M0|1 load r1
(pUStk) mov r17=1 // A
;;
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+(pUStk) st1 [r15]=r17 // M2|3
+#else
(pUStk) st1 [r14]=r17 // M2|3
+#endif
ld8.fill r13=[r3],16 // M0|1
mov f8=f0 // F clear f8
;;
@@ -775,12 +800,22 @@ ENTRY(ia64_leave_syscall)
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
;;
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ mov r19=ar.bsp // M2 get new backing store pointer
+ st8 [r14]=r22 // M save time at leave
+ mov f10=f0 // F clear f10
+
+ mov r22=r0 // A clear r22
+ movl r14=__kernel_syscall_via_epc // X
+ ;;
+#else
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
;;
+#endif
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)
@@ -913,10 +948,18 @@ GLOBAL_ENTRY(ia64_leave_kernel)
adds r16=PT(CR_IPSR)+16,r12
adds r17=PT(CR_IIP)+16,r12
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ .pred.rel.mutex pUStk,pKStk
+(pKStk) mov r22=psr // M2 read PSR now that interrupts are disabled
+(pUStk) mov.m r22=ar.itc // M fetch time at leave
+ nop.i 0
+ ;;
+#else
(pKStk) mov r22=psr // M2 read PSR now that interrupts are disabled
nop.i 0
nop.i 0
;;
+#endif
ld8 r29=[r16],16 // load cr.ipsr
ld8 r28=[r17],16 // load cr.iip
;;
@@ -938,15 +981,37 @@ GLOBAL_ENTRY(ia64_leave_kernel)
;;
ld8.fill r12=[r16],16
ld8.fill r13=[r17],16
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+(pUStk) adds r3=TI_AC_LEAVE+IA64_TASK_SIZE,r18
+#else
(pUStk) adds r18=IA64_TASK_THREAD_ON_USTACK_OFFSET,r18
+#endif
;;
ld8 r20=[r16],16 // ar.fpsr
ld8.fill r15=[r17],16
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+(pUStk) adds r18=IA64_TASK_THREAD_ON_USTACK_OFFSET,r18 // deferred
+#endif
;;
ld8.fill r14=[r16],16
ld8.fill r2=[r17]
(pUStk) mov r17=1
;;
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ // mmi_ : ld8 st1 shr;; mmi_ : st8 st1 shr;;
+ // mib : mov add br -> mib : ld8 add br
+ // bbb_ : br nop cover;; mbb_ : mov br cover;;
+ //
+ // no one require bsp in r16 if (pKStk) branch is selected.
+(pUStk) st8 [r3]=r22 // save time at leave
+(pUStk) st1 [r18]=r17 // restore current->thread.on_ustack
+ shr.u r18=r19,16 // get byte size of existing "dirty" partition
+ ;;
+ ld8.fill r3=[r16] // deferred
+ LOAD_PHYS_STACK_REG_SIZE(r17)
+(pKStk) br.cond.dpnt skip_rbs_switch
+ mov r16=ar.bsp // get existing backing store pointer
+#else
ld8.fill r3=[r16]
(pUStk) st1 [r18]=r17 // restore current->thread.on_ustack
shr.u r18=r19,16 // get byte size of existing "dirty" partition
@@ -954,6 +1019,7 @@ GLOBAL_ENTRY(ia64_leave_kernel)
mov r16=ar.bsp // get existing backing store pointer
LOAD_PHYS_STACK_REG_SIZE(r17)
(pKStk) br.cond.dpnt skip_rbs_switch
+#endif
/*
* Restore user backing store.
@@ -1090,6 +1156,9 @@ skip_rbs_switch:
* r31 = current->thread_info->flags
* On exit:
* p6 = TRUE if work-pending-check needs to be redone
+ *
+ * Interrupts are disabled on entry, reenabled depend on work, and
+ * disabled on exit.
*/
.work_pending_syscall:
add r2=-8,r2
@@ -1098,16 +1167,16 @@ skip_rbs_switch:
st8 [r2]=r8
st8 [r3]=r10
.work_pending:
- tbit.z p6,p0=r31,TIF_NEED_RESCHED // current_thread_info()->need_resched==0?
+ tbit.z p6,p0=r31,TIF_NEED_RESCHED // is resched not needed?
(p6) br.cond.sptk.few .notify
#ifdef CONFIG_PREEMPT
(pKStk) dep r21=-1,r0,PREEMPT_ACTIVE_BIT,1
;;
(pKStk) st4 [r20]=r21
- ssm psr.i // enable interrupts
#endif
+ ssm psr.i // enable interrupts
br.call.spnt.many rp=schedule
-.ret9: cmp.eq p6,p0=r0,r0 // p6 <- 1
+.ret9: cmp.eq p6,p0=r0,r0 // p6 <- 1 (re-check)
rsm psr.i // disable interrupts
;;
#ifdef CONFIG_PREEMPT
@@ -1116,13 +1185,13 @@ skip_rbs_switch:
(pKStk) st4 [r20]=r0 // preempt_count() <- 0
#endif
(pLvSys)br.cond.sptk.few .work_pending_syscall_end
- br.cond.sptk.many .work_processed_kernel // re-check
+ br.cond.sptk.many .work_processed_kernel
.notify:
(pUStk) br.call.spnt.many rp=notify_resume_user
-.ret10: cmp.ne p6,p0=r0,r0 // p6 <- 0
+.ret10: cmp.ne p6,p0=r0,r0 // p6 <- 0 (don't re-check)
(pLvSys)br.cond.sptk.few .work_pending_syscall_end
- br.cond.sptk.many .work_processed_kernel // don't re-check
+ br.cond.sptk.many .work_processed_kernel
.work_pending_syscall_end:
adds r2=PT(R8)+16,r12
@@ -1130,7 +1199,7 @@ skip_rbs_switch:
;;
ld8 r8=[r2]
ld8 r10=[r3]
- br.cond.sptk.many .work_processed_syscall // re-check
+ br.cond.sptk.many .work_processed_syscall
END(ia64_leave_kernel)
@@ -1168,9 +1237,12 @@ GLOBAL_ENTRY(ia64_invoke_schedule_tail)
END(ia64_invoke_schedule_tail)
/*
- * Setup stack and call do_notify_resume_user(). Note that pSys and pNonSys need to
- * be set up by the caller. We declare 8 input registers so the system call
- * args get preserved, in case we need to restart a system call.
+ * Setup stack and call do_notify_resume_user(), keeping interrupts
+ * disabled.
+ *
+ * Note that pSys and pNonSys need to be set up by the caller.
+ * We declare 8 input registers so the system call args get preserved,
+ * in case we need to restart a system call.
*/
ENTRY(notify_resume_user)
.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-03-13 18:08:18 +0000