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authorDavid Mosberger-Tang <davidm@hpl.hp.com>2005-04-27 21:18:22 -0700
committerTony Luck <tony.luck@intel.com>2005-04-27 21:18:22 -0700
commitc03f058fbf685f2ff630095d2c1e98d331b81e82 (patch)
treedef1271117756fdde22b4d51b03a43378ad927ca /arch/ia64/kernel/entry.S
parent87e522a0f7f8a7a5a1a880517989835c4f09c63e (diff)
downloadlinux-c03f058fbf685f2ff630095d2c1e98d331b81e82.tar.bz2
[IA64] In ia64_leave_syscall(), fix comments and whitespace only.
Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/entry.S')
-rw-r--r--arch/ia64/kernel/entry.S79
1 files changed, 39 insertions, 40 deletions
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index d97a07c77a43..a7542c3d3b3c 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -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