diff options
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 37 |
1 files changed, 19 insertions, 18 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 5971c85df136..4b01a25e29ef 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. */ @@ -499,7 +500,7 @@ 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. */ @@ -558,7 +559,7 @@ _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 +602,7 @@ 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 |