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-rw-r--r--arch/parisc/kernel/entry.S90
1 files changed, 30 insertions, 60 deletions
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index 9f939afe6b88..57944d6f9ebb 100644
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -51,30 +51,6 @@
extrd,u \spc,(64 - (SPACEID_SHIFT)),32,\prot
.endm
#endif
-
- /* Switch to virtual mapping, trashing only %r1 */
- .macro virt_map
- /* pcxt_ssm_bug */
- rsm PSW_SM_I, %r0 /* barrier for "Relied upon Translation */
- mtsp %r0, %sr4
- mtsp %r0, %sr5
- mtsp %r0, %sr6
- tovirt_r1 %r29
- load32 KERNEL_PSW, %r1
-
- rsm PSW_SM_QUIET,%r0 /* second "heavy weight" ctl op */
- mtctl %r0, %cr17 /* Clear IIASQ tail */
- mtctl %r0, %cr17 /* Clear IIASQ head */
- mtctl %r1, %ipsw
- load32 4f, %r1
- mtctl %r1, %cr18 /* Set IIAOQ tail */
- ldo 4(%r1), %r1
- mtctl %r1, %cr18 /* Set IIAOQ head */
- rfir
- nop
-4:
- .endm
-
/*
* The "get_stack" macros are responsible for determining the
* kernel stack value.
@@ -87,8 +63,8 @@
* Need to set up a kernel stack, so call the
* get_stack_use_cr30 macro to set up a pointer
* to the pt_regs structure contained within the
- * task pointer pointed to by cr30. Set the stack
- * pointer to point to the end of the task structure.
+ * task pointer pointed to by cr30. Load the stack
+ * pointer from the task structure.
*
* Note that we use shadowed registers for temps until
* we can save %r26 and %r29. %r26 is used to preserve
@@ -100,8 +76,6 @@
* or handle_interruption. %r29 is used to hold a pointer
* the register save area, and once again, it needs to
* be a non-shadowed register so that it survives the rfir.
- *
- * N.B. TASK_SZ_ALGN and PT_SZ_ALGN include space for a stack frame.
*/
.macro get_stack_use_cr30
@@ -110,12 +84,11 @@
copy %r30, %r17
mfctl %cr30, %r1
- ldo THREAD_SZ_ALGN(%r1), %r30
- mtsp %r0,%sr7
+ tophys %r1,%r9 /* task_struct */
+ LDREG TASK_STACK(%r9),%r30
+ ldo PT_SZ_ALGN(%r30),%r30
+ mtsp %r0,%sr7 /* clear sr7 after kernel stack was set! */
mtsp %r16,%sr3
- tophys %r1,%r9
- LDREG TI_TASK(%r9), %r1 /* thread_info -> task_struct */
- tophys %r1,%r9
ldo TASK_REGS(%r9),%r9
STREG %r17,PT_GR30(%r9)
STREG %r29,PT_GR29(%r9)
@@ -757,7 +730,7 @@ ENTRY(ret_from_kernel_thread)
BL schedule_tail, %r2
nop
- LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
+ mfctl %cr30,%r1 /* task_struct */
LDREG TASK_PT_GR25(%r1), %r26
#ifdef CONFIG_64BIT
LDREG TASK_PT_GR27(%r1), %r27
@@ -788,7 +761,6 @@ ENTRY_CFI(_switch_to)
STREG %r30, TASK_PT_KSP(%r26)
LDREG TASK_PT_KSP(%r25), %r30
- LDREG TASK_THREAD_INFO(%r25), %r25
bv %r0(%r2)
mtctl %r25,%cr30
@@ -819,17 +791,16 @@ ENDPROC_CFI(_switch_to)
.align PAGE_SIZE
ENTRY_CFI(syscall_exit_rfi)
- mfctl %cr30,%r16
- LDREG TI_TASK(%r16), %r16 /* thread_info -> task_struct */
+ mfctl %cr30,%r16 /* task_struct */
ldo TASK_REGS(%r16),%r16
/* Force iaoq to userspace, as the user has had access to our current
* context via sigcontext. Also Filter the PSW for the same reason.
*/
LDREG PT_IAOQ0(%r16),%r19
- depi 3,31,2,%r19
+ depi PRIV_USER,31,2,%r19
STREG %r19,PT_IAOQ0(%r16)
LDREG PT_IAOQ1(%r16),%r19
- depi 3,31,2,%r19
+ depi PRIV_USER,31,2,%r19
STREG %r19,PT_IAOQ1(%r16)
LDREG PT_PSW(%r16),%r19
load32 USER_PSW_MASK,%r1
@@ -865,14 +836,14 @@ ENTRY_CFI(syscall_exit_rfi)
ENTRY(intr_return)
/* check for reschedule */
mfctl %cr30,%r1
- LDREG TI_FLAGS(%r1),%r19 /* sched.h: TIF_NEED_RESCHED */
+ LDREG TASK_TI_FLAGS(%r1),%r19 /* sched.h: TIF_NEED_RESCHED */
bb,<,n %r19,31-TIF_NEED_RESCHED,intr_do_resched /* forward */
.import do_notify_resume,code
intr_check_sig:
/* As above */
mfctl %cr30,%r1
- LDREG TI_FLAGS(%r1),%r19
+ LDREG TASK_TI_FLAGS(%r1),%r19
ldi (_TIF_USER_WORK_MASK & ~_TIF_NEED_RESCHED), %r20
and,COND(<>) %r19, %r20, %r0
b,n intr_restore /* skip past if we've nothing to do */
@@ -974,8 +945,8 @@ intr_do_preempt:
/* current_thread_info()->preempt_count */
mfctl %cr30, %r1
- LDREG TI_PRE_COUNT(%r1), %r19
- cmpib,COND(<>) 0, %r19, intr_restore /* if preempt_count > 0 */
+ ldw TI_PRE_COUNT(%r1), %r19
+ cmpib,<> 0, %r19, intr_restore /* if preempt_count > 0 */
nop /* prev insn branched backwards */
/* check if we interrupted a critical path */
@@ -1716,7 +1687,7 @@ dtlb_fault:
.macro fork_like name
ENTRY_CFI(sys_\name\()_wrapper)
- LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
+ mfctl %cr30,%r1
ldo TASK_REGS(%r1),%r1
reg_save %r1
mfctl %cr27, %r28
@@ -1736,7 +1707,7 @@ ENTRY(child_return)
BL schedule_tail, %r2
nop
finish_child_return:
- LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
+ mfctl %cr30,%r1
ldo TASK_REGS(%r1),%r1 /* get pt regs */
LDREG PT_CR27(%r1), %r3
@@ -1747,7 +1718,7 @@ finish_child_return:
END(child_return)
ENTRY_CFI(sys_rt_sigreturn_wrapper)
- LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26
+ mfctl %cr30,%r26
ldo TASK_REGS(%r26),%r26 /* get pt regs */
/* Don't save regs, we are going to restore them from sigcontext. */
STREG %r2, -RP_OFFSET(%r30)
@@ -1764,7 +1735,7 @@ ENTRY_CFI(sys_rt_sigreturn_wrapper)
LDREG -RP_OFFSET(%r30), %r2
/* FIXME: I think we need to restore a few more things here. */
- LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+ mfctl %cr30,%r1
ldo TASK_REGS(%r1),%r1 /* get pt regs */
reg_restore %r1
@@ -1783,9 +1754,7 @@ ENTRY(syscall_exit)
*/
/* save return value now */
-
mfctl %cr30, %r1
- LDREG TI_TASK(%r1),%r1
STREG %r28,TASK_PT_GR28(%r1)
/* Seems to me that dp could be wrong here, if the syscall involved
@@ -1796,13 +1765,14 @@ ENTRY(syscall_exit)
syscall_check_resched:
/* check for reschedule */
-
- LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19 /* long */
+ mfctl %cr30,%r19
+ LDREG TASK_TI_FLAGS(%r19),%r19 /* long */
bb,<,n %r19, 31-TIF_NEED_RESCHED, syscall_do_resched /* forward */
.import do_signal,code
syscall_check_sig:
- LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19
+ mfctl %cr30,%r19
+ LDREG TASK_TI_FLAGS(%r19),%r19
ldi (_TIF_USER_WORK_MASK & ~_TIF_NEED_RESCHED), %r26
and,COND(<>) %r19, %r26, %r0
b,n syscall_restore /* skip past if we've nothing to do */
@@ -1813,7 +1783,7 @@ syscall_do_signal:
* consistent with all the relevant state of the process
* before the syscall. We need to verify this.
*/
- LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+ mfctl %cr30,%r1
ldo TASK_REGS(%r1), %r26 /* struct pt_regs *regs */
reg_save %r26
@@ -1824,17 +1794,17 @@ syscall_do_signal:
BL do_notify_resume,%r2
ldi 1, %r25 /* long in_syscall = 1 */
- LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+ mfctl %cr30,%r1
ldo TASK_REGS(%r1), %r20 /* reload pt_regs */
reg_restore %r20
b,n syscall_check_sig
syscall_restore:
- LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+ mfctl %cr30,%r1
/* Are we being ptraced? */
- ldw TASK_FLAGS(%r1),%r19
+ LDREG TASK_TI_FLAGS(%r1),%r19
ldi _TIF_SYSCALL_TRACE_MASK,%r2
and,COND(=) %r19,%r2,%r0
b,n syscall_restore_rfi
@@ -1873,7 +1843,7 @@ syscall_restore:
mtsp %r1,%sr5 /* Restore sr5 */
mtsp %r1,%sr6 /* Restore sr6 */
- depi 3,31,2,%r31 /* ensure return to user mode. */
+ depi PRIV_USER,31,2,%r31 /* ensure return to user mode. */
#ifdef CONFIG_64BIT
/* decide whether to reset the wide mode bit
@@ -1949,7 +1919,7 @@ syscall_restore_rfi:
STREG %r0,TASK_PT_SR2(%r1)
LDREG TASK_PT_GR31(%r1),%r2
- depi 3,31,2,%r2 /* ensure return to user mode. */
+ depi PRIV_USER,31,2,%r2 /* ensure return to user mode. */
STREG %r2,TASK_PT_IAOQ0(%r1)
ldo 4(%r2),%r2
STREG %r2,TASK_PT_IAOQ1(%r1)
@@ -1958,10 +1928,10 @@ syscall_restore_rfi:
pt_regs_ok:
LDREG TASK_PT_IAOQ0(%r1),%r2
- depi 3,31,2,%r2 /* ensure return to user mode. */
+ depi PRIV_USER,31,2,%r2 /* ensure return to user mode. */
STREG %r2,TASK_PT_IAOQ0(%r1)
LDREG TASK_PT_IAOQ1(%r1),%r2
- depi 3,31,2,%r2
+ depi PRIV_USER,31,2,%r2
STREG %r2,TASK_PT_IAOQ1(%r1)
b intr_restore
copy %r25,%r16
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