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-rw-r--r--arch/powerpc/kernel/entry_64.S60
1 files changed, 36 insertions, 24 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 5971c85..b40e0b4 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -146,7 +146,7 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR)
REST_2GPRS(7,r1)
addi r9,r1,STACK_FRAME_OVERHEAD
#endif
- clrrdi r11,r1,THREAD_SHIFT
+ CURRENT_THREAD_INFO(r11, r1)
ld r10,TI_FLAGS(r11)
andi. r11,r10,_TIF_SYSCALL_T_OR_A
bne- syscall_dotrace
@@ -181,7 +181,7 @@ syscall_exit:
bl .do_show_syscall_exit
ld r3,RESULT(r1)
#endif
- clrrdi r12,r1,THREAD_SHIFT
+ CURRENT_THREAD_INFO(r12, r1)
ld r8,_MSR(r1)
#ifdef CONFIG_PPC_BOOK3S
@@ -197,7 +197,16 @@ syscall_exit:
wrteei 0
#else
ld r10,PACAKMSR(r13)
- mtmsrd r10,1
+ /*
+ * For performance reasons we clear RI the same time that we
+ * clear EE. We only need to clear RI just before we restore r13
+ * below, but batching it with EE saves us one expensive mtmsrd call.
+ * We have to be careful to restore RI if we branch anywhere from
+ * here (eg syscall_exit_work).
+ */
+ li r9,MSR_RI
+ andc r11,r10,r9
+ mtmsrd r11,1
#endif /* CONFIG_PPC_BOOK3E */
ld r9,TI_FLAGS(r12)
@@ -214,17 +223,6 @@ BEGIN_FTR_SECTION
END_FTR_SECTION_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
andi. r6,r8,MSR_PR
ld r4,_LINK(r1)
- /*
- * Clear RI before restoring r13. If we are returning to
- * userspace and we take an exception after restoring r13,
- * we end up corrupting the userspace r13 value.
- */
-#ifdef CONFIG_PPC_BOOK3S
- /* No MSR:RI on BookE */
- li r12,MSR_RI
- andc r11,r10,r12
- mtmsrd r11,1 /* clear MSR.RI */
-#endif /* CONFIG_PPC_BOOK3S */
beq- 1f
ACCOUNT_CPU_USER_EXIT(r11, r12)
@@ -262,7 +260,7 @@ syscall_dotrace:
ld r7,GPR7(r1)
ld r8,GPR8(r1)
addi r9,r1,STACK_FRAME_OVERHEAD
- clrrdi r10,r1,THREAD_SHIFT
+ CURRENT_THREAD_INFO(r10, r1)
ld r10,TI_FLAGS(r10)
b .Lsyscall_dotrace_cont
@@ -271,6 +269,9 @@ syscall_enosys:
b syscall_exit
syscall_exit_work:
+#ifdef CONFIG_PPC_BOOK3S
+ mtmsrd r10,1 /* Restore RI */
+#endif
/* If TIF_RESTOREALL is set, don't scribble on either r3 or ccr.
If TIF_NOERROR is set, just save r3 as it is. */
@@ -369,6 +370,12 @@ _GLOBAL(ret_from_fork)
li r3,0
b syscall_exit
+ .section ".toc","aw"
+DSCR_DEFAULT:
+ .tc dscr_default[TC],dscr_default
+
+ .section ".text"
+
/*
* This routine switches between two different tasks. The process
* state of one is saved on its kernel stack. Then the state
@@ -499,7 +506,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT)
2:
#endif /* !CONFIG_PPC_BOOK3S */
- clrrdi r7,r8,THREAD_SHIFT /* base of new stack */
+ CURRENT_THREAD_INFO(r7, r8) /* base of new stack */
/* Note: this uses SWITCH_FRAME_SIZE rather than INT_FRAME_SIZE
because we don't need to leave the 288-byte ABI gap at the
top of the kernel stack. */
@@ -508,9 +515,6 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT)
mr r1,r8 /* start using new stack pointer */
std r7,PACAKSAVE(r13)
- ld r6,_CCR(r1)
- mtcrf 0xFF,r6
-
#ifdef CONFIG_ALTIVEC
BEGIN_FTR_SECTION
ld r0,THREAD_VRSAVE(r4)
@@ -519,14 +523,22 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif /* CONFIG_ALTIVEC */
#ifdef CONFIG_PPC64
BEGIN_FTR_SECTION
+ lwz r6,THREAD_DSCR_INHERIT(r4)
+ ld r7,DSCR_DEFAULT@toc(2)
ld r0,THREAD_DSCR(r4)
- cmpd r0,r25
- beq 1f
+ cmpwi r6,0
+ bne 1f
+ ld r0,0(r7)
+1: cmpd r0,r25
+ beq 2f
mtspr SPRN_DSCR,r0
-1:
+2:
END_FTR_SECTION_IFSET(CPU_FTR_DSCR)
#endif
+ ld r6,_CCR(r1)
+ mtcrf 0xFF,r6
+
/* r3-r13 are destroyed -- Cort */
REST_8GPRS(14, r1)
REST_10GPRS(22, r1)
@@ -558,7 +570,7 @@ _GLOBAL(ret_from_except_lite)
mtmsrd r10,1 /* Update machine state */
#endif /* CONFIG_PPC_BOOK3E */
- clrrdi r9,r1,THREAD_SHIFT /* current_thread_info() */
+ CURRENT_THREAD_INFO(r9, r1)
ld r3,_MSR(r1)
ld r4,TI_FLAGS(r9)
andi. r3,r3,MSR_PR
@@ -601,7 +613,7 @@ resume_kernel:
1: bl .preempt_schedule_irq
/* Re-test flags and eventually loop */
- clrrdi r9,r1,THREAD_SHIFT
+ CURRENT_THREAD_INFO(r9, r1)
ld r4,TI_FLAGS(r9)
andi. r0,r4,_TIF_NEED_RESCHED
bne 1b