ppc64: use the merged syscall table (640768ee) · Commits · e / devices / android_kernel_fairphone_FP3

arch/powerpc/kernel/Makefile

+5 −4

Original line number	Diff line number	Diff line
		@@ -13,7 +13,7 @@ endif
		obj-y := semaphore.o cputable.o ptrace.o syscalls.o \
		signal_32.o pmc.o
		obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \
		ptrace32.o
		ptrace32.o systbl.o
		obj-$(CONFIG_ALTIVEC) += vecemu.o vector.o
		obj-$(CONFIG_POWER4) += idle_power4.o
		obj-$(CONFIG_PPC_OF) += of_device.o
		@@ -28,12 +28,12 @@ extra-$(CONFIG_40x) := head_4xx.o
		extra-$(CONFIG_44x) := head_44x.o
		extra-$(CONFIG_FSL_BOOKE) := head_fsl_booke.o
		extra-$(CONFIG_8xx) := head_8xx.o
		extra-$(CONFIG_PPC64) += entry_64.o
		extra-y += vmlinux.lds

		obj-y += process.o init_task.o time.o \
		prom.o systbl.o traps.o setup-common.o
		obj-$(CONFIG_PPC32) += entry_32.o idle_6xx.o setup_32.o misc_32.o
		prom.o traps.o setup-common.o
		obj-$(CONFIG_PPC32) += entry_32.o idle_6xx.o setup_32.o misc_32.o \
		systbl.o
		obj-$(CONFIG_PPC64) += misc_64.o
		obj-$(CONFIG_PPC_OF) += prom_init.o
		obj-$(CONFIG_MODULES) += ppc_ksyms.o
		@@ -53,3 +53,4 @@ obj-$(CONFIG_PPC64) += traps.o process.o init_task.o time.o \
		endif

		extra-$(CONFIG_PPC_FPU) += fpu.o
		extra-$(CONFIG_PPC64) += entry_64.o

arch/powerpc/kernel/setup_64.c

+5 −13

Original line number	Diff line number	Diff line
		@@ -701,17 +701,6 @@ static void __init emergency_stack_init(void)
		limit)) + PAGE_SIZE;
		}

		extern unsigned long *sys_call_table;
		extern unsigned long sys_ni_syscall;
		#ifdef CONFIG_PPC_MERGE
		#define SYS_CALL_ENTRY64(i) sys_call_table[(i) * 2]
		#define SYS_CALL_ENTRY32(i) sys_call_table[(i) * 2 + 1]
		#else
		extern unsigned long *sys_call_table32;
		#define SYS_CALL_ENTRY64(i) sys_call_table[(i)]
		#define SYS_CALL_ENTRY32(i) sys_call_table32[(i)]
		#endif

		/*
		* Called from setup_arch to initialize the bitmap of available
		* syscalls in the systemcfg page
		@@ -719,14 +708,17 @@ extern unsigned long *sys_call_table32;
		void __init setup_syscall_map(void)
		{
		unsigned int i, count64 = 0, count32 = 0;
		extern unsigned long *sys_call_table;
		extern unsigned long sys_ni_syscall;


		for (i = 0; i < __NR_syscalls; i++) {
		if (SYS_CALL_ENTRY64(i) != sys_ni_syscall) {
		if (sys_call_table[i*2] != sys_ni_syscall) {
		count64++;
		systemcfg->syscall_map_64[i >> 5] \|=
		0x80000000UL >> (i & 0x1f);
		}
		if (SYS_CALL_ENTRY32(i) != sys_ni_syscall) {
		if (sys_call_table[i*2+1] != sys_ni_syscall) {
		count32++;
		systemcfg->syscall_map_32[i >> 5] \|=
		0x80000000UL >> (i & 0x1f);

arch/ppc64/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -81,6 +81,7 @@ CFLAGS += $(call cc-option,-funit-at-a-time)

		head-y := arch/ppc64/kernel/head.o
		head-y += arch/powerpc/kernel/fpu.o
		head-y += arch/powerpc/kernel/entry_64.o

		libs-y += arch/ppc64/lib/
		core-y += arch/ppc64/kernel/ arch/powerpc/kernel/

arch/ppc64/kernel/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -7,7 +7,7 @@ ifneq ($(CONFIG_PPC_MERGE),y)
		EXTRA_CFLAGS += -mno-minimal-toc
		extra-y := head.o vmlinux.lds

		obj-y := entry.o misc.o prom.o
		obj-y := misc.o prom.o

		endif

arch/ppc64/kernel/entry.S

deleted100644 → 0

+0 −845

Original line number	Diff line number	Diff line
		/*
		* arch/ppc64/kernel/entry.S
		*
		* PowerPC version
		* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
		* Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
		* Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
		* Adapted for Power Macintosh by Paul Mackerras.
		* Low-level exception handlers and MMU support
		* rewritten by Paul Mackerras.
		* Copyright (C) 1996 Paul Mackerras.
		* MPC8xx modifications Copyright (C) 1997 Dan Malek (dmalek@jlc.net).
		*
		* This file contains the system call entry code, context switch
		* code, and exception/interrupt return code for PowerPC.
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License
		* as published by the Free Software Foundation; either version
		* 2 of the License, or (at your option) any later version.
		*/

		#include <linux/config.h>
		#include <linux/errno.h>
		#include <asm/unistd.h>
		#include <asm/processor.h>
		#include <asm/page.h>
		#include <asm/mmu.h>
		#include <asm/thread_info.h>
		#include <asm/ppc_asm.h>
		#include <asm/asm-offsets.h>
		#include <asm/cputable.h>

		#ifdef CONFIG_PPC_ISERIES
		#define DO_SOFT_DISABLE
		#endif

		/*
		* System calls.
		*/
		.section ".toc","aw"
		.SYS_CALL_TABLE:
		.tc .sys_call_table[TC],.sys_call_table

		.SYS_CALL_TABLE32:
		.tc .sys_call_table32[TC],.sys_call_table32

		/* This value is used to mark exception frames on the stack. */
		exception_marker:
		.tc ID_72656773_68657265[TC],0x7265677368657265

		.section ".text"
		.align 7

		#undef SHOW_SYSCALLS

		.globl system_call_common
		system_call_common:
		andi. r10,r12,MSR_PR
		mr r10,r1
		addi r1,r1,-INT_FRAME_SIZE
		beq- 1f
		ld r1,PACAKSAVE(r13)
		1: std r10,0(r1)
		std r11,_NIP(r1)
		std r12,_MSR(r1)
		std r0,GPR0(r1)
		std r10,GPR1(r1)
		std r2,GPR2(r1)
		std r3,GPR3(r1)
		std r4,GPR4(r1)
		std r5,GPR5(r1)
		std r6,GPR6(r1)
		std r7,GPR7(r1)
		std r8,GPR8(r1)
		li r11,0
		std r11,GPR9(r1)
		std r11,GPR10(r1)
		std r11,GPR11(r1)
		std r11,GPR12(r1)
		std r9,GPR13(r1)
		crclr so
		mfcr r9
		mflr r10
		li r11,0xc01
		std r9,_CCR(r1)
		std r10,_LINK(r1)
		std r11,_TRAP(r1)
		mfxer r9
		mfctr r10
		std r9,_XER(r1)
		std r10,_CTR(r1)
		std r3,ORIG_GPR3(r1)
		ld r2,PACATOC(r13)
		addi r9,r1,STACK_FRAME_OVERHEAD
		ld r11,exception_marker@toc(r2)
		std r11,-16(r9) /* "regshere" marker */
		#ifdef CONFIG_PPC_ISERIES
		/* Hack for handling interrupts when soft-enabling on iSeries */
		cmpdi cr1,r0,0x5555 /* syscall 0x5555 */
		andi. r10,r12,MSR_PR /* from kernel */
		crand 4cr0+eq,4cr1+eq,4*cr0+eq
		beq hardware_interrupt_entry
		lbz r10,PACAPROCENABLED(r13)
		std r10,SOFTE(r1)
		#endif
		mfmsr r11
		ori r11,r11,MSR_EE
		mtmsrd r11,1

		#ifdef SHOW_SYSCALLS
		bl .do_show_syscall
		REST_GPR(0,r1)
		REST_4GPRS(3,r1)
		REST_2GPRS(7,r1)
		addi r9,r1,STACK_FRAME_OVERHEAD
		#endif
		clrrdi r11,r1,THREAD_SHIFT
		li r12,0
		ld r10,TI_FLAGS(r11)
		stb r12,TI_SC_NOERR(r11)
		andi. r11,r10,_TIF_SYSCALL_T_OR_A
		bne- syscall_dotrace
		syscall_dotrace_cont:
		cmpldi 0,r0,NR_syscalls
		bge- syscall_enosys

		system_call: /* label this so stack traces look sane */
		/*
		* Need to vector to 32 Bit or default sys_call_table here,
		* based on caller's run-mode / personality.
		*/
		ld r11,.SYS_CALL_TABLE@toc(2)
		andi. r10,r10,_TIF_32BIT
		beq 15f
		ld r11,.SYS_CALL_TABLE32@toc(2)
		clrldi r3,r3,32
		clrldi r4,r4,32
		clrldi r5,r5,32
		clrldi r6,r6,32
		clrldi r7,r7,32
		clrldi r8,r8,32
		15:
		slwi r0,r0,3
		ldx r10,r11,r0 /* Fetch system call handler [ptr] */
		mtctr r10
		bctrl /* Call handler */

		syscall_exit:
		#ifdef SHOW_SYSCALLS
		std r3,GPR3(r1)
		bl .do_show_syscall_exit
		ld r3,GPR3(r1)
		#endif
		std r3,RESULT(r1)
		ld r5,_CCR(r1)
		li r10,-_LAST_ERRNO
		cmpld r3,r10
		clrrdi r12,r1,THREAD_SHIFT
		bge- syscall_error
		syscall_error_cont:

		/* check for syscall tracing or audit */
		ld r9,TI_FLAGS(r12)
		andi. r0,r9,(_TIF_SYSCALL_T_OR_A\|_TIF_SINGLESTEP)
		bne- syscall_exit_trace
		syscall_exit_trace_cont:

		/* disable interrupts so current_thread_info()->flags can't change,
		and so that we don't get interrupted after loading SRR0/1. */
		ld r8,_MSR(r1)
		andi. r10,r8,MSR_RI
		beq- unrecov_restore
		mfmsr r10
		rldicl r10,r10,48,1
		rotldi r10,r10,16
		mtmsrd r10,1
		ld r9,TI_FLAGS(r12)
		andi. r0,r9,(_TIF_SYSCALL_T_OR_A\|_TIF_SIGPENDING\|_TIF_NEED_RESCHED)
		bne- syscall_exit_work
		ld r7,_NIP(r1)
		stdcx. r0,0,r1 /* to clear the reservation */
		andi. r6,r8,MSR_PR
		ld r4,_LINK(r1)
		beq- 1f /* only restore r13 if */
		ld r13,GPR13(r1) /* returning to usermode */
		1: ld r2,GPR2(r1)
		li r12,MSR_RI
		andc r10,r10,r12
		mtmsrd r10,1 /* clear MSR.RI */
		ld r1,GPR1(r1)
		mtlr r4
		mtcr r5
		mtspr SPRN_SRR0,r7
		mtspr SPRN_SRR1,r8
		rfid
		b . /* prevent speculative execution */

		syscall_enosys:
		li r3,-ENOSYS
		std r3,RESULT(r1)
		clrrdi r12,r1,THREAD_SHIFT
		ld r5,_CCR(r1)

		syscall_error:
		lbz r11,TI_SC_NOERR(r12)
		cmpwi 0,r11,0
		bne- syscall_error_cont
		neg r3,r3
		oris r5,r5,0x1000 /* Set SO bit in CR */
		std r5,_CCR(r1)
		b syscall_error_cont

		/* Traced system call support */
		syscall_dotrace:
		bl .save_nvgprs
		addi r3,r1,STACK_FRAME_OVERHEAD
		bl .do_syscall_trace_enter
		ld r0,GPR0(r1) /* Restore original registers */
		ld r3,GPR3(r1)
		ld r4,GPR4(r1)
		ld r5,GPR5(r1)
		ld r6,GPR6(r1)
		ld r7,GPR7(r1)
		ld r8,GPR8(r1)
		addi r9,r1,STACK_FRAME_OVERHEAD
		clrrdi r10,r1,THREAD_SHIFT
		ld r10,TI_FLAGS(r10)
		b syscall_dotrace_cont

		syscall_exit_trace:
		std r3,GPR3(r1)
		bl .save_nvgprs
		addi r3,r1,STACK_FRAME_OVERHEAD
		bl .do_syscall_trace_leave
		REST_NVGPRS(r1)
		ld r3,GPR3(r1)
		ld r5,_CCR(r1)
		clrrdi r12,r1,THREAD_SHIFT
		b syscall_exit_trace_cont

		/* Stuff to do on exit from a system call. */
		syscall_exit_work:
		std r3,GPR3(r1)
		std r5,_CCR(r1)
		b .ret_from_except_lite

		/* Save non-volatile GPRs, if not already saved. */
		_GLOBAL(save_nvgprs)
		ld r11,_TRAP(r1)
		andi. r0,r11,1
		beqlr-
		SAVE_NVGPRS(r1)
		clrrdi r0,r11,1
		std r0,_TRAP(r1)
		blr

		/*
		* The sigsuspend and rt_sigsuspend system calls can call do_signal
		* and thus put the process into the stopped state where we might
		* want to examine its user state with ptrace. Therefore we need
		* to save all the nonvolatile registers (r14 - r31) before calling
		* the C code. Similarly, fork, vfork and clone need the full
		* register state on the stack so that it can be copied to the child.
		*/
		_GLOBAL(ppc32_sigsuspend)
		bl .save_nvgprs
		bl .compat_sys_sigsuspend
		b 70f

		_GLOBAL(ppc64_rt_sigsuspend)
		bl .save_nvgprs
		bl .sys_rt_sigsuspend
		b 70f

		_GLOBAL(ppc32_rt_sigsuspend)
		bl .save_nvgprs
		bl .compat_sys_rt_sigsuspend
		70: cmpdi 0,r3,0
		/* If it returned an error, we need to return via syscall_exit to set
		the SO bit in cr0 and potentially stop for ptrace. */
		bne syscall_exit
		/* If sigsuspend() returns zero, we are going into a signal handler. We
		may need to call audit_syscall_exit() to mark the exit from sigsuspend() */
		#ifdef CONFIG_AUDIT
		ld r3,PACACURRENT(r13)
		ld r4,AUDITCONTEXT(r3)
		cmpdi 0,r4,0
		beq .ret_from_except /* No audit_context: Leave immediately. */
		li r4, 2 /* AUDITSC_FAILURE */
		li r5,-4 /* It's always -EINTR */
		bl .audit_syscall_exit
		#endif
		b .ret_from_except

		_GLOBAL(ppc_fork)
		bl .save_nvgprs
		bl .sys_fork
		b syscall_exit

		_GLOBAL(ppc_vfork)
		bl .save_nvgprs
		bl .sys_vfork
		b syscall_exit

		_GLOBAL(ppc_clone)
		bl .save_nvgprs
		bl .sys_clone
		b syscall_exit

		_GLOBAL(ppc32_swapcontext)
		bl .save_nvgprs
		bl .compat_sys_swapcontext
		b 80f

		_GLOBAL(ppc64_swapcontext)
		bl .save_nvgprs
		bl .sys_swapcontext
		b 80f

		_GLOBAL(ppc32_sigreturn)
		bl .compat_sys_sigreturn
		b 80f

		_GLOBAL(ppc32_rt_sigreturn)
		bl .compat_sys_rt_sigreturn
		b 80f

		_GLOBAL(ppc64_rt_sigreturn)
		bl .sys_rt_sigreturn

		80: cmpdi 0,r3,0
		blt syscall_exit
		clrrdi r4,r1,THREAD_SHIFT
		ld r4,TI_FLAGS(r4)
		andi. r4,r4,(_TIF_SYSCALL_T_OR_A\|_TIF_SINGLESTEP)
		beq+ 81f
		addi r3,r1,STACK_FRAME_OVERHEAD
		bl .do_syscall_trace_leave
		81: b .ret_from_except

		_GLOBAL(ret_from_fork)
		bl .schedule_tail
		REST_NVGPRS(r1)
		li r3,0
		b syscall_exit

		/*
		* This routine switches between two different tasks. The process
		* state of one is saved on its kernel stack. Then the state
		* of the other is restored from its kernel stack. The memory
		* management hardware is updated to the second process's state.
		* Finally, we can return to the second process, via ret_from_except.
		* On entry, r3 points to the THREAD for the current task, r4
		* points to the THREAD for the new task.
		*
		* Note: there are two ways to get to the "going out" portion
		* of this code; either by coming in via the entry (_switch)
		* or via "fork" which must set up an environment equivalent
		* to the "_switch" path. If you change this you'll have to change
		* the fork code also.
		*
		* The code which creates the new task context is in 'copy_thread'
		* in arch/ppc64/kernel/process.c
		*/
		.align 7
		_GLOBAL(_switch)
		mflr r0
		std r0,16(r1)
		stdu r1,-SWITCH_FRAME_SIZE(r1)
		/* r3-r13 are caller saved -- Cort */
		SAVE_8GPRS(14, r1)
		SAVE_10GPRS(22, r1)
		mflr r20 /* Return to switch caller */
		mfmsr r22
		li r0, MSR_FP
		#ifdef CONFIG_ALTIVEC
		BEGIN_FTR_SECTION
		oris r0,r0,MSR_VEC@h /* Disable altivec */
		mfspr r24,SPRN_VRSAVE /* save vrsave register value */
		std r24,THREAD_VRSAVE(r3)
		END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
		#endif /* CONFIG_ALTIVEC */
		and. r0,r0,r22
		beq+ 1f
		andc r22,r22,r0
		mtmsrd r22
		isync
		1: std r20,_NIP(r1)
		mfcr r23
		std r23,_CCR(r1)
		std r1,KSP(r3) /* Set old stack pointer */

		#ifdef CONFIG_SMP
		/* We need a sync somewhere here to make sure that if the
		* previous task gets rescheduled on another CPU, it sees all
		* stores it has performed on this one.
		*/
		sync
		#endif /* CONFIG_SMP */

		addi r6,r4,-THREAD /* Convert THREAD to 'current' */
		std r6,PACACURRENT(r13) /* Set new 'current' */

		ld r8,KSP(r4) /* new stack pointer */
		BEGIN_FTR_SECTION
		clrrdi r6,r8,28 /* get its ESID */
		clrrdi r9,r1,28 /* get current sp ESID */
		clrldi. r0,r6,2 /* is new ESID c00000000? */
		cmpd cr1,r6,r9 /* or is new ESID the same as current ESID? */
		cror eq,4*cr1+eq,eq
		beq 2f /* if yes, don't slbie it */

		/* Bolt in the new stack SLB entry */
		ld r7,KSP_VSID(r4) /* Get new stack's VSID */
		oris r0,r6,(SLB_ESID_V)@h
		ori r0,r0,(SLB_NUM_BOLTED-1)@l
		slbie r6
		slbie r6 /* Workaround POWER5 < DD2.1 issue */
		slbmte r7,r0
		isync

		2:
		END_FTR_SECTION_IFSET(CPU_FTR_SLB)
		clrrdi r7,r8,THREAD_SHIFT /* 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. */
		addi r7,r7,THREAD_SIZE-SWITCH_FRAME_SIZE

		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)
		mtspr SPRN_VRSAVE,r0 /* if G4, restore VRSAVE reg */
		END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
		#endif /* CONFIG_ALTIVEC */

		/* r3-r13 are destroyed -- Cort */
		REST_8GPRS(14, r1)
		REST_10GPRS(22, r1)

		/* convert old thread to its task_struct for return value */
		addi r3,r3,-THREAD
		ld r7,_NIP(r1) /* Return to _switch caller in new task */
		mtlr r7
		addi r1,r1,SWITCH_FRAME_SIZE
		blr

		.align 7
		_GLOBAL(ret_from_except)
		ld r11,_TRAP(r1)
		andi. r0,r11,1
		bne .ret_from_except_lite
		REST_NVGPRS(r1)

		_GLOBAL(ret_from_except_lite)
		/*
		* Disable interrupts so that current_thread_info()->flags
		* can't change between when we test it and when we return
		* from the interrupt.
		*/
		mfmsr r10 /* Get current interrupt state */
		rldicl r9,r10,48,1 /* clear MSR_EE */
		rotldi r9,r9,16
		mtmsrd r9,1 /* Update machine state */

		#ifdef CONFIG_PREEMPT
		clrrdi r9,r1,THREAD_SHIFT /* current_thread_info() */
		li r0,_TIF_NEED_RESCHED /* bits to check */
		ld r3,_MSR(r1)
		ld r4,TI_FLAGS(r9)
		/* Move MSR_PR bit in r3 to _TIF_SIGPENDING position in r0 */
		rlwimi r0,r3,32+TIF_SIGPENDING-MSR_PR_LG,_TIF_SIGPENDING
		and. r0,r4,r0 /* check NEED_RESCHED and maybe SIGPENDING */
		bne do_work

		#else /* !CONFIG_PREEMPT */
		ld r3,_MSR(r1) /* Returning to user mode? */
		andi. r3,r3,MSR_PR
		beq restore /* if not, just restore regs and return */

		/* Check current_thread_info()->flags */
		clrrdi r9,r1,THREAD_SHIFT
		ld r4,TI_FLAGS(r9)
		andi. r0,r4,_TIF_USER_WORK_MASK
		bne do_work
		#endif

		restore:
		#ifdef CONFIG_PPC_ISERIES
		ld r5,SOFTE(r1)
		cmpdi 0,r5,0
		beq 4f
		/* Check for pending interrupts (iSeries) */
		ld r3,PACALPPACA+LPPACAANYINT(r13)
		cmpdi r3,0
		beq+ 4f /* skip do_IRQ if no interrupts */

		li r3,0
		stb r3,PACAPROCENABLED(r13) /* ensure we are soft-disabled */
		ori r10,r10,MSR_EE
		mtmsrd r10 /* hard-enable again */
		addi r3,r1,STACK_FRAME_OVERHEAD
		bl .do_IRQ
		b .ret_from_except_lite /* loop back and handle more */

		4: stb r5,PACAPROCENABLED(r13)
		#endif

		ld r3,_MSR(r1)
		andi. r0,r3,MSR_RI
		beq- unrecov_restore

		andi. r0,r3,MSR_PR

		/*
		* r13 is our per cpu area, only restore it if we are returning to
		* userspace
		*/
		beq 1f
		REST_GPR(13, r1)
		1:
		ld r3,_CTR(r1)
		ld r0,_LINK(r1)
		mtctr r3
		mtlr r0
		ld r3,_XER(r1)
		mtspr SPRN_XER,r3

		REST_8GPRS(5, r1)

		stdcx. r0,0,r1 /* to clear the reservation */

		mfmsr r0
		li r2, MSR_RI
		andc r0,r0,r2
		mtmsrd r0,1

		ld r0,_MSR(r1)
		mtspr SPRN_SRR1,r0

		ld r2,_CCR(r1)
		mtcrf 0xFF,r2
		ld r2,_NIP(r1)
		mtspr SPRN_SRR0,r2

		ld r0,GPR0(r1)
		ld r2,GPR2(r1)
		ld r3,GPR3(r1)
		ld r4,GPR4(r1)
		ld r1,GPR1(r1)

		rfid
		b . /* prevent speculative execution */

		/* Note: this must change if we start using the TIF_NOTIFY_RESUME bit */
		do_work:
		#ifdef CONFIG_PREEMPT
		andi. r0,r3,MSR_PR /* Returning to user mode? */
		bne user_work
		/* Check that preempt_count() == 0 and interrupts are enabled */
		lwz r8,TI_PREEMPT(r9)
		cmpwi cr1,r8,0
		#ifdef CONFIG_PPC_ISERIES
		ld r0,SOFTE(r1)
		cmpdi r0,0
		#else
		andi. r0,r3,MSR_EE
		#endif
		crandc eq,cr1*4+eq,eq
		bne restore
		/* here we are preempting the current task */
		1:
		#ifdef CONFIG_PPC_ISERIES
		li r0,1
		stb r0,PACAPROCENABLED(r13)
		#endif
		ori r10,r10,MSR_EE
		mtmsrd r10,1 /* reenable interrupts */
		bl .preempt_schedule
		mfmsr r10
		clrrdi r9,r1,THREAD_SHIFT
		rldicl r10,r10,48,1 /* disable interrupts again */
		rotldi r10,r10,16
		mtmsrd r10,1
		ld r4,TI_FLAGS(r9)
		andi. r0,r4,_TIF_NEED_RESCHED
		bne 1b
		b restore

		user_work:
		#endif
		/* Enable interrupts */
		ori r10,r10,MSR_EE
		mtmsrd r10,1

		andi. r0,r4,_TIF_NEED_RESCHED
		beq 1f
		bl .schedule
		b .ret_from_except_lite

		1: bl .save_nvgprs
		li r3,0
		addi r4,r1,STACK_FRAME_OVERHEAD
		bl .do_signal
		b .ret_from_except

		unrecov_restore:
		addi r3,r1,STACK_FRAME_OVERHEAD
		bl .unrecoverable_exception
		b unrecov_restore

		#ifdef CONFIG_PPC_RTAS
		/*
		* On CHRP, the Run-Time Abstraction Services (RTAS) have to be
		* called with the MMU off.
		*
		* In addition, we need to be in 32b mode, at least for now.
		*
		* Note: r3 is an input parameter to rtas, so don't trash it...
		*/
		_GLOBAL(enter_rtas)
		mflr r0
		std r0,16(r1)
		stdu r1,-RTAS_FRAME_SIZE(r1) /* Save SP and create stack space. */

		/* Because RTAS is running in 32b mode, it clobbers the high order half
		* of all registers that it saves. We therefore save those registers
		* RTAS might touch to the stack. (r0, r3-r13 are caller saved)
		*/
		SAVE_GPR(2, r1) /* Save the TOC */
		SAVE_GPR(13, r1) /* Save paca */
		SAVE_8GPRS(14, r1) /* Save the non-volatiles */
		SAVE_10GPRS(22, r1) /* ditto */

		mfcr r4
		std r4,_CCR(r1)
		mfctr r5
		std r5,_CTR(r1)
		mfspr r6,SPRN_XER
		std r6,_XER(r1)
		mfdar r7
		std r7,_DAR(r1)
		mfdsisr r8
		std r8,_DSISR(r1)
		mfsrr0 r9
		std r9,_SRR0(r1)
		mfsrr1 r10
		std r10,_SRR1(r1)

		/* There is no way it is acceptable to get here with interrupts enabled,
		* check it with the asm equivalent of WARN_ON
		*/
		mfmsr r6
		andi. r0,r6,MSR_EE
		1: tdnei r0,0
		.section __bug_table,"a"
		.llong 1b,__LINE__ + 0x1000000, 1f, 2f
		.previous
		.section .rodata,"a"
		1: .asciz __FILE__
		2: .asciz "enter_rtas"
		.previous

		/* Unfortunately, the stack pointer and the MSR are also clobbered,
		* so they are saved in the PACA which allows us to restore
		* our original state after RTAS returns.
		*/
		std r1,PACAR1(r13)
		std r6,PACASAVEDMSR(r13)

		/* Setup our real return addr */
		SET_REG_TO_LABEL(r4,.rtas_return_loc)
		SET_REG_TO_CONST(r9,KERNELBASE)
		sub r4,r4,r9
		mtlr r4

		li r0,0
		ori r0,r0,MSR_EE\|MSR_SE\|MSR_BE\|MSR_RI
		andc r0,r6,r0

		li r9,1
		rldicr r9,r9,MSR_SF_LG,(63-MSR_SF_LG)
		ori r9,r9,MSR_IR\|MSR_DR\|MSR_FE0\|MSR_FE1\|MSR_FP
		andc r6,r0,r9
		ori r6,r6,MSR_RI
		sync /* disable interrupts so SRR0/1 */
		mtmsrd r0 /* don't get trashed */

		SET_REG_TO_LABEL(r4,rtas)
		ld r5,RTASENTRY(r4) /* get the rtas->entry value */
		ld r4,RTASBASE(r4) /* get the rtas->base value */

		mtspr SPRN_SRR0,r5
		mtspr SPRN_SRR1,r6
		rfid
		b . /* prevent speculative execution */

		_STATIC(rtas_return_loc)
		/* relocation is off at this point */
		mfspr r4,SPRN_SPRG3 /* Get PACA */
		SET_REG_TO_CONST(r5, KERNELBASE)
		sub r4,r4,r5 /* RELOC the PACA base pointer */

		mfmsr r6
		li r0,MSR_RI
		andc r6,r6,r0
		sync
		mtmsrd r6

		ld r1,PACAR1(r4) /* Restore our SP */
		LOADADDR(r3,.rtas_restore_regs)
		ld r4,PACASAVEDMSR(r4) /* Restore our MSR */

		mtspr SPRN_SRR0,r3
		mtspr SPRN_SRR1,r4
		rfid
		b . /* prevent speculative execution */

		_STATIC(rtas_restore_regs)
		/* relocation is on at this point */
		REST_GPR(2, r1) /* Restore the TOC */
		REST_GPR(13, r1) /* Restore paca */
		REST_8GPRS(14, r1) /* Restore the non-volatiles */
		REST_10GPRS(22, r1) /* ditto */

		mfspr r13,SPRN_SPRG3

		ld r4,_CCR(r1)
		mtcr r4
		ld r5,_CTR(r1)
		mtctr r5
		ld r6,_XER(r1)
		mtspr SPRN_XER,r6
		ld r7,_DAR(r1)
		mtdar r7
		ld r8,_DSISR(r1)
		mtdsisr r8
		ld r9,_SRR0(r1)
		mtsrr0 r9
		ld r10,_SRR1(r1)
		mtsrr1 r10

		addi r1,r1,RTAS_FRAME_SIZE /* Unstack our frame */
		ld r0,16(r1) /* get return address */

		mtlr r0
		blr /* return to caller */

		#endif /* CONFIG_PPC_RTAS */

		#ifdef CONFIG_PPC_MULTIPLATFORM

		_GLOBAL(enter_prom)
		mflr r0
		std r0,16(r1)
		stdu r1,-PROM_FRAME_SIZE(r1) /* Save SP and create stack space */

		/* Because PROM is running in 32b mode, it clobbers the high order half
		* of all registers that it saves. We therefore save those registers
		* PROM might touch to the stack. (r0, r3-r13 are caller saved)
		*/
		SAVE_8GPRS(2, r1)
		SAVE_GPR(13, r1)
		SAVE_8GPRS(14, r1)
		SAVE_10GPRS(22, r1)
		mfcr r4
		std r4,_CCR(r1)
		mfctr r5
		std r5,_CTR(r1)
		mfspr r6,SPRN_XER
		std r6,_XER(r1)
		mfdar r7
		std r7,_DAR(r1)
		mfdsisr r8
		std r8,_DSISR(r1)
		mfsrr0 r9
		std r9,_SRR0(r1)
		mfsrr1 r10
		std r10,_SRR1(r1)
		mfmsr r11
		std r11,_MSR(r1)

		/* Get the PROM entrypoint */
		ld r0,GPR4(r1)
		mtlr r0

		/* Switch MSR to 32 bits mode
		*/
		mfmsr r11
		li r12,1
		rldicr r12,r12,MSR_SF_LG,(63-MSR_SF_LG)
		andc r11,r11,r12
		li r12,1
		rldicr r12,r12,MSR_ISF_LG,(63-MSR_ISF_LG)
		andc r11,r11,r12
		mtmsrd r11
		isync

		/* Restore arguments & enter PROM here... */
		ld r3,GPR3(r1)
		blrl

		/* Just make sure that r1 top 32 bits didn't get
		* corrupt by OF
		*/
		rldicl r1,r1,0,32

		/* Restore the MSR (back to 64 bits) */
		ld r0,_MSR(r1)
		mtmsrd r0
		isync

		/* Restore other registers */
		REST_GPR(2, r1)
		REST_GPR(13, r1)
		REST_8GPRS(14, r1)
		REST_10GPRS(22, r1)
		ld r4,_CCR(r1)
		mtcr r4
		ld r5,_CTR(r1)
		mtctr r5
		ld r6,_XER(r1)
		mtspr SPRN_XER,r6
		ld r7,_DAR(r1)
		mtdar r7
		ld r8,_DSISR(r1)
		mtdsisr r8
		ld r9,_SRR0(r1)
		mtsrr0 r9
		ld r10,_SRR1(r1)
		mtsrr1 r10

		addi r1,r1,PROM_FRAME_SIZE
		ld r0,16(r1)
		mtlr r0
		blr

		#endif /* CONFIG_PPC_MULTIPLATFORM */