Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2426 insertions, 0 deletions

diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
new file mode 100644
index 00000000000..ee58d37dbb2
--- /dev/null
+++ b/arch/parisc/kernel/entry.S
@@ -0,0 +1,2426 @@
+/*
+ * Linux/PA-RISC Project (http://www.parisc-linux.org/)
+ *
+ * kernel entry points (interruptions, system call wrappers)
+ *  Copyright (C) 1999,2000 Philipp Rumpf 
+ *  Copyright (C) 1999 SuSE GmbH Nuernberg 
+ *  Copyright (C) 2000 Hewlett-Packard (John Marvin)
+ *  Copyright (C) 1999 Hewlett-Packard (Frank Rowand)
+ *
+ *    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, or (at your option)
+ *    any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/config.h>
+#include <asm/offsets.h>
+
+/* we have the following possibilities to act on an interruption:
+ *  - handle in assembly and use shadowed registers only
+ *  - save registers to kernel stack and handle in assembly or C */
+
+
+#include <asm/assembly.h>	/* for LDREG/STREG defines */
+#include <asm/pgtable.h>
+#include <asm/psw.h>
+#include <asm/signal.h>
+#include <asm/unistd.h>
+#include <asm/thread_info.h>
+
+#ifdef __LP64__
+#define CMPIB           cmpib,*
+#define CMPB            cmpb,*
+#define COND(x)		*x
+
+	.level 2.0w
+#else
+#define CMPIB           cmpib,
+#define CMPB            cmpb,
+#define COND(x)		x
+
+	.level 2.0
+#endif
+
+	.import         pa_dbit_lock,data
+
+	/* space_to_prot macro creates a prot id from a space id */
+
+#if (SPACEID_SHIFT) == 0
+	.macro  space_to_prot spc prot
+	depd,z  \spc,62,31,\prot
+	.endm
+#else
+	.macro  space_to_prot spc prot
+	extrd,u \spc,(64 - (SPACEID_SHIFT)),32,\prot
+	.endm
+#endif
+
+	/* Switch to virtual mapping, trashing only %r1 */
+	.macro  virt_map
+	rsm     PSW_SM_Q,%r0
+	tovirt_r1 %r29
+	mfsp	%sr7, %r1
+	or,=    %r0,%r1,%r0 /* Only save sr7 in sr3 if sr7 != 0 */
+	mtsp	%r1, %sr3
+	mtsp	%r0, %sr4
+	mtsp	%r0, %sr5
+	mtsp	%r0, %sr6
+	mtsp	%r0, %sr7
+	load32	KERNEL_PSW, %r1
+	mtctl	%r1, %cr22
+	mtctl	%r0, %cr17	/* Clear IIASQ tail */
+	mtctl	%r0, %cr17	/* Clear IIASQ head */
+	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.
+	 *
+	 * For Faults:
+	 *      If sr7 == 0
+	 *          Already using a kernel stack, so call the
+	 *          get_stack_use_r30 macro to push a pt_regs structure
+	 *          on the stack, and store registers there.
+	 *      else
+	 *          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.
+	 *
+	 * For Interrupts:
+	 *      If sr7 == 0
+	 *          Already using a kernel stack, check to see if r30
+	 *          is already pointing to the per processor interrupt
+	 *          stack. If it is, call the get_stack_use_r30 macro
+	 *          to push a pt_regs structure on the stack, and store
+	 *          registers there. Otherwise, call get_stack_use_cr31
+	 *          to get a pointer to the base of the interrupt stack
+	 *          and push a pt_regs structure on that stack.
+	 *      else
+	 *          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.
+	 *          N.B: We don't use the interrupt stack for the
+	 *          first interrupt from userland, because signals/
+	 *          resched's are processed when returning to userland,
+	 *          and we can sleep in those cases.
+	 *
+	 * Note that we use shadowed registers for temps until
+	 * we can save %r26 and %r29. %r26 is used to preserve
+	 * %r8 (a shadowed register) which temporarily contained
+	 * either the fault type ("code") or the eirr. We need
+	 * to use a non-shadowed register to carry the value over
+	 * the rfir in virt_map. We use %r26 since this value winds
+	 * up being passed as the argument to either do_cpu_irq_mask
+	 * 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
+
+	/* we save the registers in the task struct */
+
+	mfctl   %cr30, %r1
+	tophys  %r1,%r9
+	LDREG	TI_TASK(%r9), %r1	/* thread_info -> task_struct */
+	tophys  %r1,%r9
+	ldo     TASK_REGS(%r9),%r9
+	STREG   %r30, PT_GR30(%r9)
+	STREG   %r29,PT_GR29(%r9)
+	STREG   %r26,PT_GR26(%r9)
+	copy    %r9,%r29
+	mfctl   %cr30, %r1
+	ldo	THREAD_SZ_ALGN(%r1), %r30
+	.endm
+
+	.macro  get_stack_use_r30
+
+	/* we put a struct pt_regs on the stack and save the registers there */
+
+	tophys  %r30,%r9
+	STREG   %r30,PT_GR30(%r9)
+	ldo	PT_SZ_ALGN(%r30),%r30
+	STREG   %r29,PT_GR29(%r9)
+	STREG   %r26,PT_GR26(%r9)
+	copy    %r9,%r29
+	.endm
+
+	.macro  rest_stack
+	LDREG   PT_GR1(%r29), %r1
+	LDREG   PT_GR30(%r29),%r30
+	LDREG   PT_GR29(%r29),%r29
+	.endm
+
+	/* default interruption handler
+	 * (calls traps.c:handle_interruption) */
+	.macro	def code
+	b	intr_save
+	ldi     \code, %r8
+	.align	32
+	.endm
+
+	/* Interrupt interruption handler
+	 * (calls irq.c:do_cpu_irq_mask) */
+	.macro	extint code
+	b	intr_extint
+	mfsp    %sr7,%r16
+	.align	32
+	.endm	
+
+	.import	os_hpmc, code
+
+	/* HPMC handler */
+	.macro	hpmc code
+	nop			/* must be a NOP, will be patched later */
+	load32	PA(os_hpmc), %r3
+	bv,n	0(%r3)
+	nop
+	.word	0		/* checksum (will be patched) */
+	.word	PA(os_hpmc)	/* address of handler */
+	.word	0		/* length of handler */
+	.endm
+
+	/*
+	 * Performance Note: Instructions will be moved up into
+	 * this part of the code later on, once we are sure
+	 * that the tlb miss handlers are close to final form.
+	 */
+
+	/* Register definitions for tlb miss handler macros */
+
+	va  = r8	/* virtual address for which the trap occured */
+	spc = r24	/* space for which the trap occured */
+
+#ifndef __LP64__
+
+	/*
+	 * itlb miss interruption handler (parisc 1.1 - 32 bit)
+	 */
+
+	.macro	itlb_11 code
+
+	mfctl	%pcsq, spc
+	b	itlb_miss_11
+	mfctl	%pcoq, va
+
+	.align		32
+	.endm
+#endif
+	
+	/*
+	 * itlb miss interruption handler (parisc 2.0)
+	 */
+
+	.macro	itlb_20 code
+	mfctl	%pcsq, spc
+#ifdef __LP64__
+	b       itlb_miss_20w
+#else
+	b	itlb_miss_20
+#endif
+	mfctl	%pcoq, va
+
+	.align		32
+	.endm
+	
+#ifndef __LP64__
+	/*
+	 * naitlb miss interruption handler (parisc 1.1 - 32 bit)
+	 *
+	 * Note: naitlb misses will be treated
+	 * as an ordinary itlb miss for now.
+	 * However, note that naitlb misses
+	 * have the faulting address in the
+	 * IOR/ISR.
+	 */
+
+	.macro	naitlb_11 code
+
+	mfctl	%isr,spc
+	b	itlb_miss_11
+	mfctl 	%ior,va
+	/* FIXME: If user causes a naitlb miss, the priv level may not be in
+	 * lower bits of va, where the itlb miss handler is expecting them
+	 */
+
+	.align		32
+	.endm
+#endif
+	
+	/*
+	 * naitlb miss interruption handler (parisc 2.0)
+	 *
+	 * Note: naitlb misses will be treated
+	 * as an ordinary itlb miss for now.
+	 * However, note that naitlb misses
+	 * have the faulting address in the
+	 * IOR/ISR.
+	 */
+
+	.macro	naitlb_20 code
+
+	mfctl	%isr,spc
+#ifdef __LP64__
+	b       itlb_miss_20w
+#else
+	b	itlb_miss_20
+#endif
+	mfctl 	%ior,va
+	/* FIXME: If user causes a naitlb miss, the priv level may not be in
+	 * lower bits of va, where the itlb miss handler is expecting them
+	 */
+
+	.align		32
+	.endm
+	
+#ifndef __LP64__
+	/*
+	 * dtlb miss interruption handler (parisc 1.1 - 32 bit)
+	 */
+
+	.macro	dtlb_11 code
+
+	mfctl	%isr, spc
+	b	dtlb_miss_11
+	mfctl	%ior, va
+
+	.align		32
+	.endm
+#endif
+
+	/*
+	 * dtlb miss interruption handler (parisc 2.0)
+	 */
+
+	.macro	dtlb_20 code
+
+	mfctl	%isr, spc
+#ifdef __LP64__
+	b       dtlb_miss_20w
+#else
+	b	dtlb_miss_20
+#endif
+	mfctl	%ior, va
+
+	.align		32
+	.endm
+	
+#ifndef __LP64__
+	/* nadtlb miss interruption handler (parisc 1.1 - 32 bit) */
+
+	.macro	nadtlb_11 code
+
+	mfctl	%isr,spc
+	b       nadtlb_miss_11
+	mfctl	%ior,va
+
+	.align		32
+	.endm
+#endif
+	
+	/* nadtlb miss interruption handler (parisc 2.0) */
+
+	.macro	nadtlb_20 code
+
+	mfctl	%isr,spc
+#ifdef __LP64__
+	b       nadtlb_miss_20w
+#else
+	b       nadtlb_miss_20
+#endif
+	mfctl	%ior,va
+
+	.align		32
+	.endm
+	
+#ifndef __LP64__
+	/*
+	 * dirty bit trap interruption handler (parisc 1.1 - 32 bit)
+	 */
+
+	.macro	dbit_11 code
+
+	mfctl	%isr,spc
+	b	dbit_trap_11
+	mfctl	%ior,va
+
+	.align		32
+	.endm
+#endif
+
+	/*
+	 * dirty bit trap interruption handler (parisc 2.0)
+	 */
+
+	.macro	dbit_20 code
+
+	mfctl	%isr,spc
+#ifdef __LP64__
+	b       dbit_trap_20w
+#else
+	b	dbit_trap_20
+#endif
+	mfctl	%ior,va
+
+	.align		32
+	.endm
+
+	/* The following are simple 32 vs 64 bit instruction
+	 * abstractions for the macros */
+	.macro		EXTR	reg1,start,length,reg2
+#ifdef __LP64__
+	extrd,u		\reg1,32+\start,\length,\reg2
+#else
+	extrw,u		\reg1,\start,\length,\reg2
+#endif
+	.endm
+
+	.macro		DEP	reg1,start,length,reg2
+#ifdef __LP64__
+	depd		\reg1,32+\start,\length,\reg2
+#else
+	depw		\reg1,\start,\length,\reg2
+#endif
+	.endm
+
+	.macro		DEPI	val,start,length,reg
+#ifdef __LP64__
+	depdi		\val,32+\start,\length,\reg
+#else
+	depwi		\val,\start,\length,\reg
+#endif
+	.endm
+
+	/* In LP64, the space contains part of the upper 32 bits of the
+	 * fault.  We have to extract this and place it in the va,
+	 * zeroing the corresponding bits in the space register */
+	.macro		space_adjust	spc,va,tmp
+#ifdef __LP64__
+	extrd,u		\spc,63,SPACEID_SHIFT,\tmp
+	depd		%r0,63,SPACEID_SHIFT,\spc
+	depd		\tmp,31,SPACEID_SHIFT,\va
+#endif
+	.endm
+
+	.import		swapper_pg_dir,code
+
+	/* Get the pgd.  For faults on space zero (kernel space), this
+	 * is simply swapper_pg_dir.  For user space faults, the
+	 * pgd is stored in %cr25 */
+	.macro		get_pgd		spc,reg
+	ldil		L%PA(swapper_pg_dir),\reg
+	ldo		R%PA(swapper_pg_dir)(\reg),\reg
+	or,COND(=)	%r0,\spc,%r0
+	mfctl		%cr25,\reg
+	.endm
+
+	/* 
+		space_check(spc,tmp,fault)
+
+		spc - The space we saw the fault with.
+		tmp - The place to store the current space.
+		fault - Function to call on failure.
+
+		Only allow faults on different spaces from the
+		currently active one if we're the kernel 
+
+	*/
+	.macro		space_check	spc,tmp,fault
+	mfsp		%sr7,\tmp
+	or,COND(<>)	%r0,\spc,%r0	/* user may execute gateway page
+					 * as kernel, so defeat the space
+					 * check if it is */
+	copy		\spc,\tmp
+	or,COND(=)	%r0,\tmp,%r0	/* nullify if executing as kernel */
+	cmpb,COND(<>),n	\tmp,\spc,\fault
+	.endm
+
+	/* Look up a PTE in a 2-Level scheme (faulting at each
+	 * level if the entry isn't present 
+	 *
+	 * NOTE: we use ldw even for LP64, since the short pointers
+	 * can address up to 1TB
+	 */
+	.macro		L2_ptep	pmd,pte,index,va,fault
+#if PT_NLEVELS == 3
+	EXTR		\va,31-ASM_PMD_SHIFT,ASM_BITS_PER_PMD,\index
+#else
+	EXTR		\va,31-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index
+#endif
+	DEP             %r0,31,PAGE_SHIFT,\pmd  /* clear offset */
+	copy		%r0,\pte
+	ldw,s		\index(\pmd),\pmd
+	bb,>=,n		\pmd,_PxD_PRESENT_BIT,\fault
+	DEP		%r0,31,PxD_FLAG_SHIFT,\pmd /* clear flags */
+	copy		\pmd,%r9
+#ifdef __LP64__
+	shld		%r9,PxD_VALUE_SHIFT,\pmd
+#else
+	shlw		%r9,PxD_VALUE_SHIFT,\pmd
+#endif
+	EXTR		\va,31-PAGE_SHIFT,ASM_BITS_PER_PTE,\index
+	DEP		%r0,31,PAGE_SHIFT,\pmd  /* clear offset */
+	shladd		\index,BITS_PER_PTE_ENTRY,\pmd,\pmd
+	LDREG		%r0(\pmd),\pte		/* pmd is now pte */
+	bb,>=,n		\pte,_PAGE_PRESENT_BIT,\fault
+	.endm
+
+	/* Look up PTE in a 3-Level scheme.
+	 *
+	 * Here we implement a Hybrid L2/L3 scheme: we allocate the
+	 * first pmd adjacent to the pgd.  This means that we can
+	 * subtract a constant offset to get to it.  The pmd and pgd
+	 * sizes are arranged so that a single pmd covers 4GB (giving
+	 * a full LP64 process access to 8TB) so our lookups are
+	 * effectively L2 for the first 4GB of the kernel (i.e. for
+	 * all ILP32 processes and all the kernel for machines with
+	 * under 4GB of memory) */
+	.macro		L3_ptep pgd,pte,index,va,fault
+	extrd,u		\va,63-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index
+	copy		%r0,\pte
+	extrd,u,*=	\va,31,32,%r0
+	ldw,s		\index(\pgd),\pgd
+	extrd,u,*=	\va,31,32,%r0
+	bb,>=,n		\pgd,_PxD_PRESENT_BIT,\fault
+	extrd,u,*=	\va,31,32,%r0
+	shld		\pgd,PxD_VALUE_SHIFT,\index
+	extrd,u,*=	\va,31,32,%r0
+	copy		\index,\pgd
+	extrd,u,*<>	\va,31,32,%r0
+	ldo		ASM_PGD_PMD_OFFSET(\pgd),\pgd
+	L2_ptep		\pgd,\pte,\index,\va,\fault
+	.endm
+
+	/* Set the _PAGE_ACCESSED bit of the PTE.  Be clever and
+	 * don't needlessly dirty the cache line if it was already set */
+	.macro		update_ptep	ptep,pte,tmp,tmp1
+	ldi		_PAGE_ACCESSED,\tmp1
+	or		\tmp1,\pte,\tmp
+	and,COND(<>)	\tmp1,\pte,%r0
+	STREG		\tmp,0(\ptep)
+	.endm
+
+	/* Set the dirty bit (and accessed bit).  No need to be
+	 * clever, this is only used from the dirty fault */
+	.macro		update_dirty	ptep,pte,tmp
+	ldi		_PAGE_ACCESSED|_PAGE_DIRTY,\tmp
+	or		\tmp,\pte,\pte
+	STREG		\pte,0(\ptep)
+	.endm
+
+	/* Convert the pte and prot to tlb insertion values.  How
+	 * this happens is quite subtle, read below */
+	.macro		make_insert_tlb	spc,pte,prot
+	space_to_prot   \spc \prot        /* create prot id from space */
+	/* The following is the real subtlety.  This is depositing
+	 * T <-> _PAGE_REFTRAP
+	 * D <-> _PAGE_DIRTY
+	 * B <-> _PAGE_DMB (memory break)
+	 *
+	 * Then incredible subtlety: The access rights are
+	 * _PAGE_GATEWAY _PAGE_EXEC _PAGE_READ
+	 * See 3-14 of the parisc 2.0 manual
+	 *
+	 * Finally, _PAGE_READ goes in the top bit of PL1 (so we
+	 * trigger an access rights trap in user space if the user
+	 * tries to read an unreadable page */
+	depd            \pte,8,7,\prot
+
+	/* PAGE_USER indicates the page can be read with user privileges,
+	 * so deposit X1|11 to PL1|PL2 (remember the upper bit of PL1
+	 * contains _PAGE_READ */
+	extrd,u,*=      \pte,_PAGE_USER_BIT+32,1,%r0
+	depdi		7,11,3,\prot
+	/* If we're a gateway page, drop PL2 back to zero for promotion
+	 * to kernel privilege (so we can execute the page as kernel).
+	 * Any privilege promotion page always denys read and write */
+	extrd,u,*= 	\pte,_PAGE_GATEWAY_BIT+32,1,%r0
+	depd		%r0,11,2,\prot	/* If Gateway, Set PL2 to 0 */
+
+	/* Get rid of prot bits and convert to page addr for iitlbt */
+
+	depd		%r0,63,PAGE_SHIFT,\pte
+	extrd,u		\pte,56,32,\pte
+	.endm
+
+	/* Identical macro to make_insert_tlb above, except it
+	 * makes the tlb entry for the differently formatted pa11
+	 * insertion instructions */
+	.macro		make_insert_tlb_11	spc,pte,prot
+	zdep		\spc,30,15,\prot
+	dep		\pte,8,7,\prot
+	extru,=		\pte,_PAGE_NO_CACHE_BIT,1,%r0
+	depi		1,12,1,\prot
+	extru,=         \pte,_PAGE_USER_BIT,1,%r0
+	depi		7,11,3,\prot   /* Set for user space (1 rsvd for read) */
+	extru,= 	\pte,_PAGE_GATEWAY_BIT,1,%r0
+	depi		0,11,2,\prot	/* If Gateway, Set PL2 to 0 */
+
+	/* Get rid of prot bits and convert to page addr for iitlba */
+
+	depi		0,31,12,\pte
+	extru		\pte,24,25,\pte
+
+	.endm
+
+	/* This is for ILP32 PA2.0 only.  The TLB insertion needs
+	 * to extend into I/O space if the address is 0xfXXXXXXX
+	 * so we extend the f's into the top word of the pte in
+	 * this case */
+	.macro		f_extend	pte,tmp
+	extrd,s		\pte,42,4,\tmp
+	addi,<>		1,\tmp,%r0
+	extrd,s		\pte,63,25,\pte
+	.endm
+
+	/* The alias region is an 8MB aligned 16MB to do clear and
+	 * copy user pages at addresses congruent with the user
+	 * virtual address.
+	 *
+	 * To use the alias page, you set %r26 up with the to TLB
+	 * entry (identifying the physical page) and %r23 up with
+	 * the from tlb entry (or nothing if only a to entry---for
+	 * clear_user_page_asm) */
+	.macro		do_alias	spc,tmp,tmp1,va,pte,prot,fault
+	cmpib,COND(<>),n 0,\spc,\fault
+	ldil		L%(TMPALIAS_MAP_START),\tmp
+#if defined(__LP64__) && (TMPALIAS_MAP_START >= 0x80000000)
+	/* on LP64, ldi will sign extend into the upper 32 bits,
+	 * which is behaviour we don't want */
+	depdi		0,31,32,\tmp
+#endif
+	copy		\va,\tmp1
+	DEPI		0,31,23,\tmp1
+	cmpb,COND(<>),n	\tmp,\tmp1,\fault
+	ldi		(_PAGE_DIRTY|_PAGE_WRITE|_PAGE_READ),\prot
+	depd,z		\prot,8,7,\prot
+	/*
+	 * OK, it is in the temp alias region, check whether "from" or "to".
+	 * Check "subtle" note in pacache.S re: r23/r26.
+	 */
+#ifdef __LP64__
+	extrd,u,*=	\va,41,1,%r0
+#else
+	extrw,u,=	\va,9,1,%r0
+#endif
+	or,COND(tr)	%r23,%r0,\pte
+	or		%r26,%r0,\pte
+	.endm 
+
+
+	/*
+	 * Align fault_vector_20 on 4K boundary so that both
+	 * fault_vector_11 and fault_vector_20 are on the
+	 * same page. This is only necessary as long as we
+	 * write protect the kernel text, which we may stop
+	 * doing once we use large page translations to cover
+	 * the static part of the kernel address space.
+	 */
+
+	.export fault_vector_20
+
+	.text
+
+	.align 4096
+
+fault_vector_20:
+	/* First vector is invalid (0) */
+	.ascii	"cows can fly"
+	.byte 0
+	.align 32
+
+	hpmc		 1
+	def		 2
+	def		 3
+	extint		 4
+	def		 5
+	itlb_20		 6
+	def		 7
+	def		 8
+	def              9
+	def		10
+	def		11
+	def		12
+	def		13
+	def		14
+	dtlb_20		15
+#if 0
+	naitlb_20	16
+#else
+	def             16
+#endif
+	nadtlb_20	17
+	def		18
+	def		19
+	dbit_20		20
+	def		21
+	def		22
+	def		23
+	def		24
+	def		25
+	def		26
+	def		27
+	def		28
+	def		29
+	def		30
+	def		31
+
+#ifndef __LP64__
+
+	.export fault_vector_11
+	
+	.align 2048
+
+fault_vector_11:
+	/* First vector is invalid (0) */
+	.ascii	"cows can fly"
+	.byte 0
+	.align 32
+
+	hpmc		 1
+	def		 2
+	def		 3
+	extint		 4
+	def		 5
+	itlb_11		 6
+	def		 7
+	def		 8
+	def              9
+	def		10
+	def		11
+	def		12
+	def		13
+	def		14
+	dtlb_11		15
+#if 0
+	naitlb_11	16
+#else
+	def             16
+#endif
+	nadtlb_11	17
+	def		18
+	def		19
+	dbit_11		20
+	def		21
+	def		22
+	def		23
+	def		24
+	def		25
+	def		26
+	def		27
+	def		28
+	def		29
+	def		30
+	def		31
+
+#endif
+
+	.import		handle_interruption,code
+	.import		do_cpu_irq_mask,code
+
+	/*
+	 * r26 = function to be called
+	 * r25 = argument to pass in
+	 * r24 = flags for do_fork()
+	 *
+	 * Kernel threads don't ever return, so they don't need
+	 * a true register context. We just save away the arguments
+	 * for copy_thread/ret_ to properly set up the child.
+	 */
+
+#define CLONE_VM 0x100	/* Must agree with <linux/sched.h> */
+#define CLONE_UNTRACED 0x00800000
+
+	.export __kernel_thread, code
+	.import do_fork
+__kernel_thread:
+	STREG	%r2, -RP_OFFSET(%r30)
+
+	copy	%r30, %r1
+	ldo	PT_SZ_ALGN(%r30),%r30
+#ifdef __LP64__
+	/* Yo, function pointers in wide mode are little structs... -PB */
+	ldd	24(%r26), %r2
+	STREG	%r2, PT_GR27(%r1)	/* Store childs %dp */
+	ldd	16(%r26), %r26
+
+	STREG	%r22, PT_GR22(%r1)	/* save r22 (arg5) */
+	copy	%r0, %r22		/* user_tid */
+#endif
+	STREG	%r26, PT_GR26(%r1)  /* Store function & argument for child */
+	STREG	%r25, PT_GR25(%r1)
+	ldil	L%CLONE_UNTRACED, %r26
+	ldo	CLONE_VM(%r26), %r26   /* Force CLONE_VM since only init_mm */
+	or	%r26, %r24, %r26      /* will have kernel mappings.	 */
+	ldi	1, %r25			/* stack_start, signals kernel thread */
+	stw	%r0, -52(%r30)	     	/* user_tid */
+#ifdef __LP64__
+	ldo	-16(%r30),%r29		/* Reference param save area */
+#endif
+	BL	do_fork, %r2
+	copy	%r1, %r24		/* pt_regs */
+
+	/* Parent Returns here */
+
+	LDREG	-PT_SZ_ALGN-RP_OFFSET(%r30), %r2
+	ldo	-PT_SZ_ALGN(%r30), %r30
+	bv	%r0(%r2)
+	nop
+
+	/*
+	 * Child Returns here
+	 *
+	 * copy_thread moved args from temp save area set up above
+	 * into task save area.
+	 */
+
+	.export	ret_from_kernel_thread
+ret_from_kernel_thread:
+
+	/* Call schedule_tail first though */
+	BL	schedule_tail, %r2
+	nop
+
+	LDREG	TI_TASK-THREAD_SZ_ALGN(%r30), %r1
+	LDREG	TASK_PT_GR25(%r1), %r26
+#ifdef __LP64__
+	LDREG	TASK_PT_GR27(%r1), %r27
+	LDREG	TASK_PT_GR22(%r1), %r22
+#endif
+	LDREG	TASK_PT_GR26(%r1), %r1
+	ble	0(%sr7, %r1)
+	copy	%r31, %r2
+
+#ifdef __LP64__
+	ldo	-16(%r30),%r29		/* Reference param save area */
+	loadgp				/* Thread could have been in a module */
+#endif
+	b	sys_exit
+	ldi	0, %r26
+
+	.import	sys_execve, code
+	.export	__execve, code
+__execve:
+	copy	%r2, %r15
+	copy	%r30, %r16
+	ldo	PT_SZ_ALGN(%r30), %r30
+	STREG	%r26, PT_GR26(%r16)
+	STREG	%r25, PT_GR25(%r16)
+	STREG	%r24, PT_GR24(%r16)
+#ifdef __LP64__
+	ldo	-16(%r30),%r29		/* Reference param save area */
+#endif
+	BL	sys_execve, %r2
+	copy	%r16, %r26
+
+	cmpib,=,n 0,%r28,intr_return    /* forward */
+
+	/* yes, this will trap and die. */
+	copy	%r15, %r2
+	copy	%r16, %r30
+	bv	%r0(%r2)
+	nop
+
+	.align 4
+
+	/*
+	 * struct task_struct *_switch_to(struct task_struct *prev,
+	 *	struct task_struct *next)
+	 *
+	 * switch kernel stacks and return prev */
+	.export	_switch_to, code
+_switch_to:
+	STREG	 %r2, -RP_OFFSET(%r30)
+
+	callee_save
+
+	load32	_switch_to_ret, %r2
+
+	STREG	%r2, TASK_PT_KPC(%r26)
+	LDREG	TASK_PT_KPC(%r25), %r2
+
+	STREG	%r30, TASK_PT_KSP(%r26)
+	LDREG	TASK_PT_KSP(%r25), %r30
+	LDREG	TASK_THREAD_INFO(%r25), %r25
+	bv	%r0(%r2)
+	mtctl   %r25,%cr30
+
+_switch_to_ret:
+	mtctl	%r0, %cr0		/* Needed for single stepping */
+	callee_rest
+
+	LDREG	-RP_OFFSET(%r30), %r2
+	bv	%r0(%r2)
+	copy	%r26, %r28
+
+	/*
+	 * Common rfi return path for interruptions, kernel execve, and
+	 * sys_rt_sigreturn (sometimes).  The sys_rt_sigreturn syscall will
+	 * return via this path if the signal was received when the process
+	 * was running; if the process was blocked on a syscall then the
+	 * normal syscall_exit path is used.  All syscalls for traced
+	 * proceses exit via intr_restore.
+	 *
+	 * XXX If any syscalls that change a processes space id ever exit
+	 * this way, then we will need to copy %sr3 in to PT_SR[3..7], and
+	 * adjust IASQ[0..1].
+	 *
+	 * Note that the following code uses a "relied upon translation".
+	 * See the parisc ACD for details. The ssm is necessary due to a
+	 * PCXT bug.
+	 */
+
+	.align 4096
+
+	.export	syscall_exit_rfi
+syscall_exit_rfi:
+	mfctl   %cr30,%r16
+	LDREG	TI_TASK(%r16), %r16	/* thread_info -> 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
+	STREG	%r19,PT_IAOQ0(%r16)
+	LDREG	PT_IAOQ1(%r16),%r19
+	depi	3,31,2,%r19
+	STREG	%r19,PT_IAOQ1(%r16)
+	LDREG   PT_PSW(%r16),%r19
+	load32	USER_PSW_MASK,%r1
+#ifdef __LP64__
+	load32	USER_PSW_HI_MASK,%r20
+	depd    %r20,31,32,%r1
+#endif
+	and     %r19,%r1,%r19 /* Mask out bits that user shouldn't play with */
+	load32	USER_PSW,%r1
+	or      %r19,%r1,%r19 /* Make sure default USER_PSW bits are set */
+	STREG   %r19,PT_PSW(%r16)
+
+	/*
+	 * If we aren't being traced, we never saved space registers
+	 * (we don't store them in the sigcontext), so set them
+	 * to "proper" values now (otherwise we'll wind up restoring
+	 * whatever was last stored in the task structure, which might
+	 * be inconsistent if an interrupt occured while on the gateway
+	 * page) Note that we may be "trashing" values the user put in
+	 * them, but we don't support the the user changing them.
+	 */
+
+	STREG   %r0,PT_SR2(%r16)
+	mfsp    %sr3,%r19
+	STREG   %r19,PT_SR0(%r16)
+	STREG   %r19,PT_SR1(%r16)
+	STREG   %r19,PT_SR3(%r16)
+	STREG   %r19,PT_SR4(%r16)
+	STREG   %r19,PT_SR5(%r16)
+	STREG   %r19,PT_SR6(%r16)
+	STREG   %r19,PT_SR7(%r16)
+
+intr_return:
+	/* NOTE: Need to enable interrupts incase we schedule. */
+	ssm     PSW_SM_I, %r0
+
+	/* Check for software interrupts */
+
+	.import irq_stat,data
+
+	load32	irq_stat,%r19
+#ifdef CONFIG_SMP
+	mfctl   %cr30,%r1
+	ldw	TI_CPU(%r1),%r1 /* get cpu # - int */
+	/* shift left ____cacheline_aligned (aka L1_CACHE_BYTES) amount
+	** irq_stat[] is defined using ____cacheline_aligned.
+	*/
+#ifdef __LP64__
+	shld	%r1, 6, %r20
+#else
+	shlw	%r1, 5, %r20
+#endif
+	add     %r19,%r20,%r19	/* now have &irq_stat[smp_processor_id()] */
+#endif /* CONFIG_SMP */
+
+	LDREG   IRQSTAT_SIRQ_PEND(%r19),%r20    /* hardirq.h: unsigned long */
+	cmpib,<>,n 0,%r20,intr_do_softirq /* forward */
+
+intr_check_resched:
+
+	/* check for reschedule */
+	mfctl   %cr30,%r1
+	LDREG   TI_FLAGS(%r1),%r19	/* sched.h: TIF_NEED_RESCHED */
+	bb,<,n	%r19,31-TIF_NEED_RESCHED,intr_do_resched /* forward */
+
+intr_check_sig:
+	/* As above */
+	mfctl   %cr30,%r1
+	LDREG	TI_FLAGS(%r1),%r19	/* sched.h: TIF_SIGPENDING */
+	bb,<,n %r19, 31-TIF_SIGPENDING, intr_do_signal /* forward */
+
+intr_restore:
+	copy            %r16,%r29
+	ldo             PT_FR31(%r29),%r1
+	rest_fp         %r1
+	rest_general    %r29
+
+	/* Create a "relied upon translation" PA 2.0 Arch. F-5 */
+	ssm		0,%r0
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	tophys_r1       %r29
+	rsm             (PSW_SM_Q|PSW_SM_P|PSW_SM_D|PSW_SM_I),%r0
+
+	/* Restore space id's and special cr's from PT_REGS
+	 * structure pointed to by r29 */
+	rest_specials	%r29
+
+	/* Important: Note that rest_stack restores r29
+	 * last (we are using it)! It also restores r1 and r30. */
+	rest_stack
+
+	rfi
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+
+	.import do_softirq,code
+intr_do_softirq:
+	bl      do_softirq,%r2
+#ifdef __LP64__
+	ldo	-16(%r30),%r29		/* Reference param save area */
+#else
+	nop
+#endif
+	b       intr_check_resched
+	nop
+
+	.import schedule,code
+intr_do_resched:
+	/* Only do reschedule if we are returning to user space */
+	LDREG	PT_IASQ0(%r16), %r20
+	CMPIB= 0,%r20,intr_restore /* backward */
+	nop
+	LDREG	PT_IASQ1(%r16), %r20
+	CMPIB= 0,%r20,intr_restore /* backward */
+	nop
+
+#ifdef __LP64__
+	ldo	-16(%r30),%r29		/* Reference param save area */
+#endif
+
+	ldil	L%intr_check_sig, %r2
+	b	schedule
+	ldo	R%intr_check_sig(%r2), %r2
+
+
+	.import do_signal,code
+intr_do_signal:
+	/* 
+		This check is critical to having LWS
+		working. The IASQ is zero on the gateway
+		page and we cannot deliver any signals until
+		we get off the gateway page.
+
+		Only do signals if we are returning to user space 
+	*/
+	LDREG	PT_IASQ0(%r16), %r20
+	CMPIB= 0,%r20,intr_restore /* backward */
+	nop
+	LDREG	PT_IASQ1(%r16), %r20
+	CMPIB= 0,%r20,intr_restore /* backward */
+	nop
+
+	copy	%r0, %r24			/* unsigned long in_syscall */
+	copy	%r16, %r25			/* struct pt_regs *regs */
+#ifdef __LP64__
+	ldo	-16(%r30),%r29			/* Reference param save area */
+#endif
+
+	BL	do_signal,%r2
+	copy	%r0, %r26			/* sigset_t *oldset = NULL */
+
+	b	intr_check_sig
+	nop
+
+	/*
+	 * External interrupts.
+	 */
+
+intr_extint:
+	CMPIB=,n 0,%r16,1f
+	get_stack_use_cr30
+	b,n 3f
+
+1:
+#if 0  /* Interrupt Stack support not working yet! */
+	mfctl	%cr31,%r1
+	copy	%r30,%r17
+	/* FIXME! depi below has hardcoded idea of interrupt stack size (32k)*/
+#ifdef __LP64__
+	depdi	0,63,15,%r17
+#else
+	depi	0,31,15,%r17
+#endif
+	CMPB=,n	%r1,%r17,2f
+	get_stack_use_cr31
+	b,n 3f
+#endif
+2:
+	get_stack_use_r30
+
+3:
+	save_specials	%r29
+	virt_map
+	save_general	%r29
+
+	ldo	PT_FR0(%r29), %r24
+	save_fp	%r24
+	
+	loadgp
+
+	copy	%r29, %r26	/* arg0 is pt_regs */
+	copy	%r29, %r16	/* save pt_regs */
+
+	ldil	L%intr_return, %r2
+
+#ifdef __LP64__
+	ldo	-16(%r30),%r29	/* Reference param save area */
+#endif
+
+	b	do_cpu_irq_mask
+	ldo	R%intr_return(%r2), %r2	/* return to intr_return, not here */
+
+
+	/* Generic interruptions (illegal insn, unaligned, page fault, etc) */
+
+	.export         intr_save, code /* for os_hpmc */
+
+intr_save:
+	mfsp    %sr7,%r16
+	CMPIB=,n 0,%r16,1f
+	get_stack_use_cr30
+	b	2f
+	copy    %r8,%r26
+
+1:
+	get_stack_use_r30
+	copy    %r8,%r26
+
+2:
+	save_specials	%r29
+
+	/* If this trap is a itlb miss, skip saving/adjusting isr/ior */
+
+	/*
+	 * FIXME: 1) Use a #define for the hardwired "6" below (and in
+	 *           traps.c.
+	 *        2) Once we start executing code above 4 Gb, we need
+	 *           to adjust iasq/iaoq here in the same way we
+	 *           adjust isr/ior below.
+	 */
+
+	CMPIB=,n        6,%r26,skip_save_ior
+
+	/* save_specials left ipsw value in r8 for us to test */
+
+	mfctl           %cr20, %r16 /* isr */
+	mfctl           %cr21, %r17 /* ior */
+
+#ifdef __LP64__
+	/*
+	 * If the interrupted code was running with W bit off (32 bit),
+	 * clear the b bits (bits 0 & 1) in the ior.
+	 */
+	extrd,u,*<>     %r8,PSW_W_BIT,1,%r0
+	depdi           0,1,2,%r17
+
+	/*
+	 * FIXME: This code has hardwired assumptions about the split
+	 *        between space bits and offset bits. This will change
+	 *        when we allow alternate page sizes.
+	 */
+
+	/* adjust isr/ior. */
+
+	extrd,u         %r16,63,7,%r1    /* get high bits from isr for ior */
+	depd            %r1,31,7,%r17    /* deposit them into ior */
+	depdi           0,63,7,%r16      /* clear them from isr */
+#endif
+	STREG           %r16, PT_ISR(%r29)
+	STREG           %r17, PT_IOR(%r29)
+
+
+skip_save_ior:
+	virt_map
+	save_general	%r29
+
+	ldo		PT_FR0(%r29), %r25
+	save_fp		%r25
+	
+	loadgp
+
+	copy		%r29, %r25	/* arg1 is pt_regs */
+#ifdef __LP64__
+	ldo		-16(%r30),%r29	/* Reference param save area */
+#endif
+
+	ldil		L%intr_check_sig, %r2
+	copy		%r25, %r16	/* save pt_regs */
+
+	b		handle_interruption
+	ldo		R%intr_check_sig(%r2), %r2
+
+
+	/*
+	 * Note for all tlb miss handlers:
+	 *
+	 * cr24 contains a pointer to the kernel address space
+	 * page directory.
+	 *
+	 * cr25 contains a pointer to the current user address
+	 * space page directory.
+	 *
+	 * sr3 will contain the space id of the user address space
+	 * of the current running thread while that thread is
+	 * running in the kernel.
+	 */
+
+	/*
+	 * register number allocations.  Note that these are all
+	 * in the shadowed registers
+	 */
+
+	t0 = r1		/* temporary register 0 */
+	va = r8		/* virtual address for which the trap occured */
+	t1 = r9		/* temporary register 1 */
+	pte  = r16	/* pte/phys page # */
+	prot = r17	/* prot bits */
+	spc  = r24	/* space for which the trap occured */
+	ptp = r25	/* page directory/page table pointer */
+
+#ifdef __LP64__
+
+dtlb_miss_20w:
+	space_adjust	spc,va,t0
+	get_pgd		spc,ptp
+	space_check	spc,t0,dtlb_fault
+
+	L3_ptep		ptp,pte,t0,va,dtlb_check_alias_20w
+
+	update_ptep	ptp,pte,t0,t1
+
+	make_insert_tlb	spc,pte,prot
+	
+	idtlbt          pte,prot
+
+	rfir
+	nop
+
+dtlb_check_alias_20w:
+	do_alias	spc,t0,t1,va,pte,prot,dtlb_fault
+
+	idtlbt          pte,prot
+
+	rfir
+	nop
+
+nadtlb_miss_20w:
+	space_adjust	spc,va,t0
+	get_pgd		spc,ptp
+	space_check	spc,t0,nadtlb_fault
+
+	L3_ptep		ptp,pte,t0,va,nadtlb_check_flush_20w
+
+	update_ptep	ptp,pte,t0,t1
+
+	make_insert_tlb	spc,pte,prot
+
+	idtlbt          pte,prot
+
+	rfir
+	nop
+
+nadtlb_check_flush_20w:
+	bb,>=,n          pte,_PAGE_FLUSH_BIT,nadtlb_emulate
+
+	/* Insert a "flush only" translation */
+
+	depdi,z         7,7,3,prot
+	depdi           1,10,1,prot
+
+	/* Get rid of prot bits and convert to page addr for idtlbt */
+
+	depdi		0,63,12,pte
+	extrd,u         pte,56,52,pte
+	idtlbt          pte,prot
+
+	rfir
+	nop
+
+#else
+
+dtlb_miss_11:
+	get_pgd		spc,ptp
+
+	space_check	spc,t0,dtlb_fault
+
+	L2_ptep		ptp,pte,t0,va,dtlb_check_alias_11
+
+	update_ptep	ptp,pte,t0,t1
+
+	make_insert_tlb_11	spc,pte,prot
+
+	mfsp		%sr1,t0  /* Save sr1 so we can use it in tlb inserts */
+	mtsp		spc,%sr1
+
+	idtlba		pte,(%sr1,va)
+	idtlbp		prot,(%sr1,va)
+
+	mtsp		t0, %sr1	/* Restore sr1 */
+
+	rfir
+	nop
+
+dtlb_check_alias_11:
+
+	/* Check to see if fault is in the temporary alias region */
+
+	cmpib,<>,n      0,spc,dtlb_fault /* forward */
+	ldil            L%(TMPALIAS_MAP_START),t0
+	copy            va,t1
+	depwi           0,31,23,t1
+	cmpb,<>,n       t0,t1,dtlb_fault /* forward */
+	ldi             (_PAGE_DIRTY|_PAGE_WRITE|_PAGE_READ),prot
+	depw,z          prot,8,7,prot
+
+	/*
+	 * OK, it is in the temp alias region, check whether "from" or "to".
+	 * Check "subtle" note in pacache.S re: r23/r26.
+	 */
+
+	extrw,u,=       va,9,1,r0
+	or,tr           %r23,%r0,pte    /* If "from" use "from" page */
+	or              %r26,%r0,pte    /* else "to", use "to" page  */
+
+	idtlba          pte,(va)
+	idtlbp          prot,(va)
+
+	rfir
+	nop
+
+nadtlb_miss_11:
+	get_pgd		spc,ptp
+
+	space_check	spc,t0,nadtlb_fault
+
+	L2_ptep		ptp,pte,t0,va,nadtlb_check_flush_11
+
+	update_ptep	ptp,pte,t0,t1
+
+	make_insert_tlb_11	spc,pte,prot
+
+
+	mfsp		%sr1,t0  /* Save sr1 so we can use it in tlb inserts */
+	mtsp		spc,%sr1
+
+	idtlba		pte,(%sr1,va)
+	idtlbp		prot,(%sr1,va)
+
+	mtsp		t0, %sr1	/* Restore sr1 */
+
+	rfir
+	nop
+
+nadtlb_check_flush_11:
+	bb,>=,n          pte,_PAGE_FLUSH_BIT,nadtlb_emulate
+
+	/* Insert a "flush only" translation */
+
+	zdepi           7,7,3,prot
+	depi            1,10,1,prot
+
+	/* Get rid of prot bits and convert to page addr for idtlba */
+
+	depi		0,31,12,pte
+	extru		pte,24,25,pte
+
+	mfsp		%sr1,t0  /* Save sr1 so we can use it in tlb inserts */
+	mtsp		spc,%sr1
+
+	idtlba		pte,(%sr1,va)
+	idtlbp		prot,(%sr1,va)
+
+	mtsp		t0, %sr1	/* Restore sr1 */
+
+	rfir
+	nop
+
+dtlb_miss_20:
+	space_adjust	spc,va,t0
+	get_pgd		spc,ptp
+	space_check	spc,t0,dtlb_fault
+
+	L2_ptep		ptp,pte,t0,va,dtlb_check_alias_20
+
+	update_ptep	ptp,pte,t0,t1
+
+	make_insert_tlb	spc,pte,prot
+
+	f_extend	pte,t0
+
+	idtlbt          pte,prot
+
+	rfir
+	nop
+
+dtlb_check_alias_20:
+	do_alias	spc,t0,t1,va,pte,prot,dtlb_fault
+	
+	idtlbt          pte,prot
+
+	rfir
+	nop
+
+nadtlb_miss_20:
+	get_pgd		spc,ptp
+
+	space_check	spc,t0,nadtlb_fault
+
+	L2_ptep		ptp,pte,t0,va,nadtlb_check_flush_20
+
+	update_ptep	ptp,pte,t0,t1
+
+	make_insert_tlb	spc,pte,prot
+
+	f_extend	pte,t0
+	
+        idtlbt          pte,prot
+
+	rfir
+	nop
+
+nadtlb_check_flush_20:
+	bb,>=,n          pte,_PAGE_FLUSH_BIT,nadtlb_emulate
+
+	/* Insert a "flush only" translation */
+
+	depdi,z         7,7,3,prot
+	depdi           1,10,1,prot
+
+	/* Get rid of prot bits and convert to page addr for idtlbt */
+
+	depdi		0,63,12,pte
+	extrd,u         pte,56,32,pte
+	idtlbt          pte,prot
+
+	rfir
+	nop
+#endif
+
+nadtlb_emulate:
+
+	/*
+	 * Non access misses can be caused by fdc,fic,pdc,lpa,probe and
+	 * probei instructions. We don't want to fault for these
+	 * instructions (not only does it not make sense, it can cause
+	 * deadlocks, since some flushes are done with the mmap
+	 * semaphore held). If the translation doesn't exist, we can't
+	 * insert a translation, so have to emulate the side effects
+	 * of the instruction. Since we don't insert a translation
+	 * we can get a lot of faults during a flush loop, so it makes
+	 * sense to try to do it here with minimum overhead. We only
+	 * emulate fdc,fic,pdc,probew,prober instructions whose base 
+	 * and index registers are not shadowed. We defer everything 
+	 * else to the "slow" path.
+	 */
+
+	mfctl           %cr19,%r9 /* Get iir */
+
+	/* PA 2.0 Arch Ref. Book pg 382 has a good description of the insn bits.
+	   Checks for fdc,fdce,pdc,"fic,4f",prober,probeir,probew, probeiw */
+
+	/* Checks for fdc,fdce,pdc,"fic,4f" only */
+	ldi             0x280,%r16
+	and             %r9,%r16,%r17
+	cmpb,<>,n       %r16,%r17,nadtlb_probe_check
+	bb,>=,n         %r9,26,nadtlb_nullify  /* m bit not set, just nullify */
+	BL		get_register,%r25
+	extrw,u         %r9,15,5,%r8           /* Get index register # */
+	CMPIB=,n        -1,%r1,nadtlb_fault    /* have to use slow path */
+	copy            %r1,%r24
+	BL		get_register,%r25
+	extrw,u         %r9,10,5,%r8           /* Get base register # */
+	CMPIB=,n        -1,%r1,nadtlb_fault    /* have to use slow path */
+	BL		set_register,%r25
+	add,l           %r1,%r24,%r1           /* doesn't affect c/b bits */
+
+nadtlb_nullify:
+	mfctl           %cr22,%r8              /* Get ipsw */
+	ldil            L%PSW_N,%r9
+	or              %r8,%r9,%r8            /* Set PSW_N */
+	mtctl           %r8,%cr22
+
+	rfir
+	nop
+
+	/* 
+		When there is no translation for the probe address then we
+		must nullify the insn and return zero in the target regsiter.
+		This will indicate to the calling code that it does not have 
+		write/read privileges to this address.
+
+		This should technically work for prober and probew in PA 1.1,
+		and also probe,r and probe,w in PA 2.0
+
+		WARNING: USE ONLY NON-SHADOW REGISTERS WITH PROBE INSN!
+		THE SLOW-PATH EMULATION HAS NOT BEEN WRITTEN YET.
+
+	*/
+nadtlb_probe_check:
+	ldi             0x80,%r16
+	and             %r9,%r16,%r17
+	cmpb,<>,n       %r16,%r17,nadtlb_fault /* Must be probe,[rw]*/
+	BL              get_register,%r25      /* Find the target register */
+	extrw,u         %r9,31,5,%r8           /* Get target register */
+	CMPIB=,n        -1,%r1,nadtlb_fault    /* have to use slow path */
+	BL		set_register,%r25
+	copy            %r0,%r1                /* Write zero to target register */
+	b nadtlb_nullify                       /* Nullify return insn */
+	nop
+
+
+#ifdef __LP64__
+itlb_miss_20w:
+
+	/*
+	 * I miss is a little different, since we allow users to fault
+	 * on the gateway page which is in the kernel address space.
+	 */
+
+	space_adjust	spc,va,t0
+	get_pgd		spc,ptp
+	space_check	spc,t0,itlb_fault
+
+	L3_ptep		ptp,pte,t0,va,itlb_fault
+
+	update_ptep	ptp,pte,t0,t1
+
+	make_insert_tlb	spc,pte,prot
+	
+	iitlbt          pte,prot
+
+	rfir
+	nop
+
+#else
+
+itlb_miss_11:
+	get_pgd		spc,ptp
+
+	space_check	spc,t0,itlb_fault
+
+	L2_ptep		ptp,pte,t0,va,itlb_fault
+
+	update_ptep	ptp,pte,t0,t1
+
+	make_insert_tlb_11	spc,pte,prot
+
+	mfsp		%sr1,t0  /* Save sr1 so we can use it in tlb inserts */
+	mtsp		spc,%sr1
+
+	iitlba		pte,(%sr1,va)
+	iitlbp		prot,(%sr1,va)
+
+	mtsp		t0, %sr1	/* Restore sr1 */
+
+	rfir
+	nop
+
+itlb_miss_20:
+	get_pgd		spc,ptp
+
+	space_check	spc,t0,itlb_fault
+
+	L2_ptep		ptp,pte,t0,va,itlb_fault
+
+	update_ptep	ptp,pte,t0,t1
+
+	make_insert_tlb	spc,pte,prot
+
+	f_extend	pte,t0	
+
+	iitlbt          pte,prot
+
+	rfir
+	nop
+
+#endif
+
+#ifdef __LP64__
+
+dbit_trap_20w:
+	space_adjust	spc,va,t0
+	get_pgd		spc,ptp
+	space_check	spc,t0,dbit_fault
+
+	L3_ptep		ptp,pte,t0,va,dbit_fault
+
+#ifdef CONFIG_SMP
+	CMPIB=,n        0,spc,dbit_nolock_20w
+	load32		PA(pa_dbit_lock),t0
+
+dbit_spin_20w:
+	ldcw            0(t0),t1
+	cmpib,=         0,t1,dbit_spin_20w
+	nop
+
+dbit_nolock_20w:
+#endif
+	update_dirty	ptp,pte,t1
+
+	make_insert_tlb	spc,pte,prot
+		
+	idtlbt          pte,prot
+#ifdef CONFIG_SMP
+	CMPIB=,n        0,spc,dbit_nounlock_20w
+	ldi             1,t1
+	stw             t1,0(t0)
+
+dbit_nounlock_20w:
+#endif
+
+	rfir
+	nop
+#else
+
+dbit_trap_11:
+
+	get_pgd		spc,ptp
+
+	space_check	spc,t0,dbit_fault
+
+	L2_ptep		ptp,pte,t0,va,dbit_fault
+
+#ifdef CONFIG_SMP
+	CMPIB=,n        0,spc,dbit_nolock_11
+	load32		PA(pa_dbit_lock),t0
+
+dbit_spin_11:
+	ldcw            0(t0),t1
+	cmpib,=         0,t1,dbit_spin_11
+	nop
+
+dbit_nolock_11:
+#endif
+	update_dirty	ptp,pte,t1
+
+	make_insert_tlb_11	spc,pte,prot
+
+	mfsp            %sr1,t1  /* Save sr1 so we can use it in tlb inserts */
+	mtsp		spc,%sr1
+
+	idtlba		pte,(%sr1,va)
+	idtlbp		prot,(%sr1,va)
+
+	mtsp            t1, %sr1     /* Restore sr1 */
+#ifdef CONFIG_SMP
+	CMPIB=,n        0,spc,dbit_nounlock_11
+	ldi             1,t1
+	stw             t1,0(t0)
+
+dbit_nounlock_11:
+#endif
+
+	rfir
+	nop
+
+dbit_trap_20:
+	get_pgd		spc,ptp
+
+	space_check	spc,t0,dbit_fault
+
+	L2_ptep		ptp,pte,t0,va,dbit_fault
+
+#ifdef CONFIG_SMP
+	CMPIB=,n        0,spc,dbit_nolock_20
+	load32		PA(pa_dbit_lock),t0
+
+dbit_spin_20:
+	ldcw            0(t0),t1
+	cmpib,=         0,t1,dbit_spin_20
+	nop
+
+dbit_nolock_20:
+#endif
+	update_dirty	ptp,pte,t1
+
+	make_insert_tlb	spc,pte,prot
+
+	f_extend	pte,t1
+	
+        idtlbt          pte,prot
+
+#ifdef CONFIG_SMP
+	CMPIB=,n        0,spc,dbit_nounlock_20
+	ldi             1,t1
+	stw             t1,0(t0)
+
+dbit_nounlock_20:
+#endif
+
+	rfir
+	nop
+#endif
+
+	.import handle_interruption,code
+
+kernel_bad_space:
+	b               intr_save
+	ldi             31,%r8  /* Use an unused code */
+
+dbit_fault:
+	b               intr_save
+	ldi             20,%r8
+
+itlb_fault:
+	b               intr_save
+	ldi             6,%r8
+
+nadtlb_fault:
+	b               intr_save
+	ldi             17,%r8
+
+dtlb_fault:
+	b               intr_save
+	ldi             15,%r8
+
+	/* Register saving semantics for system calls:
+
+	   %r1		   clobbered by system call macro in userspace
+	   %r2		   saved in PT_REGS by gateway page
+	   %r3  - %r18	   preserved by C code (saved by signal code)
+	   %r19 - %r20	   saved in PT_REGS by gateway page
+	   %r21 - %r22	   non-standard syscall args
+			   stored in kernel stack by gateway page
+	   %r23 - %r26	   arg3-arg0, saved in PT_REGS by gateway page
+	   %r27 - %r30	   saved in PT_REGS by gateway page
+	   %r31		   syscall return pointer
+	 */
+
+	/* Floating point registers (FIXME: what do we do with these?)
+
+	   %fr0  - %fr3	   status/exception, not preserved
+	   %fr4  - %fr7	   arguments
+	   %fr8	 - %fr11   not preserved by C code
+	   %fr12 - %fr21   preserved by C code
+	   %fr22 - %fr31   not preserved by C code
+	 */
+
+	.macro	reg_save regs
+	STREG	%r3, PT_GR3(\regs)
+	STREG	%r4, PT_GR4(\regs)
+	STREG	%r5, PT_GR5(\regs)
+	STREG	%r6, PT_GR6(\regs)
+	STREG	%r7, PT_GR7(\regs)
+	STREG	%r8, PT_GR8(\regs)
+	STREG	%r9, PT_GR9(\regs)
+	STREG   %r10,PT_GR10(\regs)
+	STREG   %r11,PT_GR11(\regs)
+	STREG   %r12,PT_GR12(\regs)
+	STREG   %r13,PT_GR13(\regs)
+	STREG   %r14,PT_GR14(\regs)
+	STREG   %r15,PT_GR15(\regs)
+	STREG   %r16,PT_GR16(\regs)
+	STREG   %r17,PT_GR17(\regs)
+	STREG   %r18,PT_GR18(\regs)
+	.endm
+
+	.macro	reg_restore regs
+	LDREG	PT_GR3(\regs), %r3
+	LDREG	PT_GR4(\regs), %r4
+	LDREG	PT_GR5(\regs), %r5
+	LDREG	PT_GR6(\regs), %r6
+	LDREG	PT_GR7(\regs), %r7
+	LDREG	PT_GR8(\regs), %r8
+	LDREG	PT_GR9(\regs), %r9
+	LDREG   PT_GR10(\regs),%r10
+	LDREG   PT_GR11(\regs),%r11
+	LDREG   PT_GR12(\regs),%r12
+	LDREG   PT_GR13(\regs),%r13
+	LDREG   PT_GR14(\regs),%r14
+	LDREG   PT_GR15(\regs),%r15
+	LDREG   PT_GR16(\regs),%r16
+	LDREG   PT_GR17(\regs),%r17
+	LDREG   PT_GR18(\regs),%r18
+	.endm
+
+	.export sys_fork_wrapper
+	.export child_return
+sys_fork_wrapper:
+	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
+	ldo	TASK_REGS(%r1),%r1
+	reg_save %r1
+	mfctl	%cr27, %r3
+	STREG	%r3, PT_CR27(%r1)
+
+	STREG	%r2,-RP_OFFSET(%r30)
+	ldo	FRAME_SIZE(%r30),%r30
+#ifdef __LP64__
+	ldo	-16(%r30),%r29		/* Reference param save area */
+#endif
+
+	/* These are call-clobbered registers and therefore
+	   also syscall-clobbered (we hope). */
+	STREG	%r2,PT_GR19(%r1)	/* save for child */
+	STREG	%r30,PT_GR21(%r1)
+
+	LDREG	PT_GR30(%r1),%r25
+	copy	%r1,%r24
+	BL	sys_clone,%r2
+	ldi	SIGCHLD,%r26
+
+	LDREG	-RP_OFFSET-FRAME_SIZE(%r30),%r2
+wrapper_exit:
+	ldo	-FRAME_SIZE(%r30),%r30		/* get the stackframe */
+	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+	ldo	TASK_REGS(%r1),%r1	 /* get pt regs */
+
+	LDREG	PT_CR27(%r1), %r3
+	mtctl	%r3, %cr27
+	reg_restore %r1
+
+	/* strace expects syscall # to be preserved in r20 */
+	ldi	__NR_fork,%r20
+	bv %r0(%r2)
+	STREG	%r20,PT_GR20(%r1)
+
+	/* Set the return value for the child */
+child_return:
+	BL	schedule_tail, %r2
+	nop
+
+	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE-FRAME_SIZE(%r30), %r1
+	LDREG	TASK_PT_GR19(%r1),%r2
+	b	wrapper_exit
+	copy	%r0,%r28
+
+	
+	.export sys_clone_wrapper
+sys_clone_wrapper:
+	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+	ldo	TASK_REGS(%r1),%r1	/* get pt regs */
+	reg_save %r1
+	mfctl	%cr27, %r3
+	STREG	%r3, PT_CR27(%r1)
+
+	STREG	%r2,-RP_OFFSET(%r30)
+	ldo	FRAME_SIZE(%r30),%r30
+#ifdef __LP64__
+	ldo	-16(%r30),%r29		/* Reference param save area */
+#endif
+
+	STREG	%r2,PT_GR19(%r1)	/* save for child */
+	STREG	%r30,PT_GR21(%r1)
+	BL	sys_clone,%r2
+	copy	%r1,%r24
+
+	b	wrapper_exit
+	LDREG	-RP_OFFSET-FRAME_SIZE(%r30),%r2
+
+	.export sys_vfork_wrapper
+sys_vfork_wrapper:
+	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+	ldo	TASK_REGS(%r1),%r1	/* get pt regs */
+	reg_save %r1
+	mfctl	%cr27, %r3
+	STREG	%r3, PT_CR27(%r1)
+
+	STREG	%r2,-RP_OFFSET(%r30)
+	ldo	FRAME_SIZE(%r30),%r30
+#ifdef __LP64__
+	ldo	-16(%r30),%r29		/* Reference param save area */
+#endif
+
+	STREG	%r2,PT_GR19(%r1)	/* save for child */
+	STREG	%r30,PT_GR21(%r1)
+
+	BL	sys_vfork,%r2
+	copy	%r1,%r26
+
+	b	wrapper_exit
+	LDREG	-RP_OFFSET-FRAME_SIZE(%r30),%r2
+
+	
+	.macro  execve_wrapper execve
+	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+	ldo	TASK_REGS(%r1),%r1	/* get pt regs */
+
+	/*
+	 * Do we need to save/restore r3-r18 here?
+	 * I don't think so. why would new thread need old
+	 * threads registers?
+	 */
+
+	/* %arg0 - %arg3 are already saved for us. */
+
+	STREG %r2,-RP_OFFSET(%r30)
+	ldo FRAME_SIZE(%r30),%r30
+#ifdef __LP64__
+	ldo	-16(%r30),%r29		/* Reference param save area */
+#endif
+	bl \execve,%r2
+	copy %r1,%arg0
+
+	ldo -FRAME_SIZE(%r30),%r30
+	LDREG -RP_OFFSET(%r30),%r2
+
+	/* If exec succeeded we need to load the args */
+
+	ldo -1024(%r0),%r1
+	cmpb,>>= %r28,%r1,error_\execve
+	copy %r2,%r19
+
+error_\execve:
+	bv %r0(%r19)
+	nop
+	.endm
+
+	.export sys_execve_wrapper
+	.import sys_execve
+
+sys_execve_wrapper:
+	execve_wrapper sys_execve
+
+#ifdef __LP64__
+	.export sys32_execve_wrapper
+	.import sys32_execve
+
+sys32_execve_wrapper:
+	execve_wrapper sys32_execve
+#endif
+
+	.export sys_rt_sigreturn_wrapper
+sys_rt_sigreturn_wrapper:
+	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%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)
+#ifdef __LP64__
+	ldo	FRAME_SIZE(%r30), %r30
+	BL	sys_rt_sigreturn,%r2
+	ldo	-16(%r30),%r29		/* Reference param save area */
+#else
+	BL	sys_rt_sigreturn,%r2
+	ldo	FRAME_SIZE(%r30), %r30
+#endif
+
+	ldo	-FRAME_SIZE(%r30), %r30
+	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
+	ldo	TASK_REGS(%r1),%r1	/* get pt regs */
+	reg_restore %r1
+
+	/* If the signal was received while the process was blocked on a
+	 * syscall, then r2 will take us to syscall_exit; otherwise r2 will
+	 * take us to syscall_exit_rfi and on to intr_return.
+	 */
+	bv	%r0(%r2)
+	LDREG	PT_GR28(%r1),%r28  /* reload original r28 for syscall_exit */
+
+	.export sys_sigaltstack_wrapper
+sys_sigaltstack_wrapper:
+	/* Get the user stack pointer */
+	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+	ldo	TASK_REGS(%r1),%r24	/* get pt regs */
+	LDREG	TASK_PT_GR30(%r24),%r24
+	STREG	%r2, -RP_OFFSET(%r30)
+#ifdef __LP64__
+	ldo	FRAME_SIZE(%r30), %r30
+	b,l	do_sigaltstack,%r2
+	ldo	-16(%r30),%r29		/* Reference param save area */
+#else
+	bl	do_sigaltstack,%r2
+	ldo	FRAME_SIZE(%r30), %r30
+#endif
+
+	ldo	-FRAME_SIZE(%r30), %r30
+	LDREG	-RP_OFFSET(%r30), %r2
+	bv	%r0(%r2)
+	nop
+
+#ifdef __LP64__
+	.export sys32_sigaltstack_wrapper
+sys32_sigaltstack_wrapper:
+	/* Get the user stack pointer */
+	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r24
+	LDREG	TASK_PT_GR30(%r24),%r24
+	STREG	%r2, -RP_OFFSET(%r30)
+	ldo	FRAME_SIZE(%r30), %r30
+	b,l	do_sigaltstack32,%r2
+	ldo	-16(%r30),%r29		/* Reference param save area */
+
+	ldo	-FRAME_SIZE(%r30), %r30
+	LDREG	-RP_OFFSET(%r30), %r2
+	bv	%r0(%r2)
+	nop
+#endif
+
+	.export sys_rt_sigsuspend_wrapper
+sys_rt_sigsuspend_wrapper:
+	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
+	ldo	TASK_REGS(%r1),%r24
+	reg_save %r24
+
+	STREG	%r2, -RP_OFFSET(%r30)
+#ifdef __LP64__
+	ldo	FRAME_SIZE(%r30), %r30
+	b,l	sys_rt_sigsuspend,%r2
+	ldo	-16(%r30),%r29		/* Reference param save area */
+#else
+	bl	sys_rt_sigsuspend,%r2
+	ldo	FRAME_SIZE(%r30), %r30
+#endif
+
+	ldo	-FRAME_SIZE(%r30), %r30
+	LDREG	-RP_OFFSET(%r30), %r2
+
+	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
+	ldo	TASK_REGS(%r1),%r1
+	reg_restore %r1
+
+	bv	%r0(%r2)
+	nop
+
+	.export syscall_exit
+syscall_exit:
+
+	/* NOTE: HP-UX syscalls also come through here
+	 * after hpux_syscall_exit fixes up return
+	 * values. */
+
+	/* NOTE: Not all syscalls exit this way.  rt_sigreturn will exit
+	 * via syscall_exit_rfi if the signal was received while the process
+	 * was running.
+	 */
+
+	/* save return value now */
+
+	mfctl     %cr30, %r1
+	LDREG     TI_TASK(%r1),%r1
+	STREG     %r28,TASK_PT_GR28(%r1)
+
+#ifdef CONFIG_HPUX
+
+/* <linux/personality.h> cannot be easily included */
+#define PER_HPUX 0x10
+	LDREG     TASK_PERSONALITY(%r1),%r19
+
+	/* We can't use "CMPIB<> PER_HPUX" since "im5" field is sign extended */
+	ldo	  -PER_HPUX(%r19), %r19
+	CMPIB<>,n 0,%r19,1f
+
+	/* Save other hpux returns if personality is PER_HPUX */
+	STREG     %r22,TASK_PT_GR22(%r1)
+	STREG     %r29,TASK_PT_GR29(%r1)
+1:
+
+#endif /* CONFIG_HPUX */
+
+	/* Seems to me that dp could be wrong here, if the syscall involved
+	 * calling a module, and nothing got round to restoring dp on return.
+	 */
+	loadgp
+
+syscall_check_bh:
+
+	/* Check for software interrupts */
+
+	.import irq_stat,data
+
+	load32	irq_stat,%r19
+
+#ifdef CONFIG_SMP
+	/* sched.h: int processor */
+	/* %r26 is used as scratch register to index into irq_stat[] */
+	ldw     TI_CPU-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26 /* cpu # */
+
+	/* shift left ____cacheline_aligned (aka L1_CACHE_BYTES) bits */
+#ifdef __LP64__
+	shld	%r26, 6, %r20
+#else
+	shlw	%r26, 5, %r20
+#endif
+	add     %r19,%r20,%r19	/* now have &irq_stat[smp_processor_id()] */
+#endif /* CONFIG_SMP */
+
+	LDREG   IRQSTAT_SIRQ_PEND(%r19),%r20    /* hardirq.h: unsigned long */
+	cmpib,<>,n 0,%r20,syscall_do_softirq /* forward */
+
+syscall_check_resched:
+
+	/* check for reschedule */
+
+	LDREG	TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19	/* long */
+	bb,<,n	%r19, 31-TIF_NEED_RESCHED, syscall_do_resched /* forward */
+
+syscall_check_sig:
+	LDREG	TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19    /* get ti flags */
+	bb,<,n	%r19, 31-TIF_SIGPENDING, syscall_do_signal /* forward */
+
+syscall_restore:
+	/* Are we being ptraced? */
+	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+
+	LDREG	TASK_PTRACE(%r1), %r19
+	bb,<	%r19,31,syscall_restore_rfi
+	nop
+
+	ldo	TASK_PT_FR31(%r1),%r19		   /* reload fpregs */
+	rest_fp	%r19
+
+	LDREG	TASK_PT_SAR(%r1),%r19		   /* restore SAR */
+	mtsar	%r19
+
+	LDREG	TASK_PT_GR2(%r1),%r2		   /* restore user rp */
+	LDREG	TASK_PT_GR19(%r1),%r19
+	LDREG   TASK_PT_GR20(%r1),%r20
+	LDREG	TASK_PT_GR21(%r1),%r21
+	LDREG	TASK_PT_GR22(%r1),%r22
+	LDREG	TASK_PT_GR23(%r1),%r23
+	LDREG	TASK_PT_GR24(%r1),%r24
+	LDREG	TASK_PT_GR25(%r1),%r25
+	LDREG	TASK_PT_GR26(%r1),%r26
+	LDREG	TASK_PT_GR27(%r1),%r27	   /* restore user dp */
+	LDREG	TASK_PT_GR28(%r1),%r28	   /* syscall return value */
+	LDREG	TASK_PT_GR29(%r1),%r29
+	LDREG	TASK_PT_GR31(%r1),%r31	   /* restore syscall rp */
+
+	/* NOTE: We use rsm/ssm pair to make this operation atomic */
+	rsm     PSW_SM_I, %r0
+	LDREG   TASK_PT_GR30(%r1),%r30             /* restore user sp */
+	mfsp	%sr3,%r1			   /* Get users space id */
+	mtsp    %r1,%sr7                           /* Restore sr7 */
+	ssm     PSW_SM_I, %r0
+
+	/* Set sr2 to zero for userspace syscalls to work. */
+	mtsp	%r0,%sr2 
+	mtsp	%r1,%sr4			   /* Restore sr4 */
+	mtsp	%r1,%sr5			   /* Restore sr5 */
+	mtsp	%r1,%sr6			   /* Restore sr6 */
+
+	depi	3,31,2,%r31			   /* ensure return to user mode. */
+
+#ifdef __LP64__
+	/* decide whether to reset the wide mode bit
+	 *
+	 * For a syscall, the W bit is stored in the lowest bit
+	 * of sp.  Extract it and reset W if it is zero */
+	extrd,u,*<>	%r30,63,1,%r1
+	rsm	PSW_SM_W, %r0
+	/* now reset the lowest bit of sp if it was set */
+	xor	%r30,%r1,%r30
+#endif
+	be,n    0(%sr3,%r31)                       /* return to user space */
+
+	/* We have to return via an RFI, so that PSW T and R bits can be set
+	 * appropriately.
+	 * This sets up pt_regs so we can return via intr_restore, which is not
+	 * the most efficient way of doing things, but it works.
+	 */
+syscall_restore_rfi:
+	ldo	-1(%r0),%r2			   /* Set recovery cntr to -1 */
+	mtctl	%r2,%cr0			   /*   for immediate trap */
+	LDREG	TASK_PT_PSW(%r1),%r2		   /* Get old PSW */
+	ldi	0x0b,%r20			   /* Create new PSW */
+	depi	-1,13,1,%r20			   /* C, Q, D, and I bits */
+
+	/* The values of PA_SINGLESTEP_BIT and PA_BLOCKSTEP_BIT are
+	 * set in include/linux/ptrace.h and converted to PA bitmap
+	 * numbers in asm-offsets.c */
+
+	/* if ((%r19.PA_SINGLESTEP_BIT)) { %r20.27=1} */
+	extru,=	%r19,PA_SINGLESTEP_BIT,1,%r0
+	depi	-1,27,1,%r20			   /* R bit */
+
+	/* if ((%r19.PA_BLOCKSTEP_BIT)) { %r20.7=1} */
+	extru,= %r19,PA_BLOCKSTEP_BIT,1,%r0
+	depi	-1,7,1,%r20			   /* T bit */
+
+	STREG	%r20,TASK_PT_PSW(%r1)
+
+	/* Always store space registers, since sr3 can be changed (e.g. fork) */
+
+	mfsp    %sr3,%r25
+	STREG   %r25,TASK_PT_SR3(%r1)
+	STREG   %r25,TASK_PT_SR4(%r1)
+	STREG   %r25,TASK_PT_SR5(%r1)
+	STREG   %r25,TASK_PT_SR6(%r1)
+	STREG   %r25,TASK_PT_SR7(%r1)
+	STREG   %r25,TASK_PT_IASQ0(%r1)
+	STREG   %r25,TASK_PT_IASQ1(%r1)
+
+	/* XXX W bit??? */
+	/* Now if old D bit is clear, it means we didn't save all registers
+	 * on syscall entry, so do that now.  This only happens on TRACEME
+	 * calls, or if someone attached to us while we were on a syscall.
+	 * We could make this more efficient by not saving r3-r18, but
+	 * then we wouldn't be able to use the common intr_restore path.
+	 * It is only for traced processes anyway, so performance is not
+	 * an issue.
+	 */
+	bb,<	%r2,30,pt_regs_ok		   /* Branch if D set */
+	ldo	TASK_REGS(%r1),%r25
+	reg_save %r25				   /* Save r3 to r18 */
+
+	/* Save the current sr */
+	mfsp	%sr0,%r2
+	STREG	%r2,TASK_PT_SR0(%r1)
+
+	/* Save the scratch sr */
+	mfsp	%sr1,%r2
+	STREG	%r2,TASK_PT_SR1(%r1)
+
+	/* sr2 should be set to zero for userspace syscalls */
+	STREG	%r0,TASK_PT_SR2(%r1)
+
+pt_regs_ok:
+	LDREG	TASK_PT_GR31(%r1),%r2
+	depi	3,31,2,%r2			   /* ensure return to user mode. */
+	STREG	%r2,TASK_PT_IAOQ0(%r1)
+	ldo	4(%r2),%r2
+	STREG	%r2,TASK_PT_IAOQ1(%r1)
+	copy	%r25,%r16
+	b	intr_restore
+	nop
+
+	.import do_softirq,code
+syscall_do_softirq:
+	bl      do_softirq,%r2
+	nop
+	/* NOTE: We enable I-bit incase we schedule later,
+	 * and we might be going back to userspace if we were
+	 * traced. */
+	b       syscall_check_resched
+	ssm     PSW_SM_I, %r0  /* do_softirq returns with I bit off */
+
+	.import schedule,code
+syscall_do_resched:
+	BL	schedule,%r2
+#ifdef __LP64__
+	ldo	-16(%r30),%r29		/* Reference param save area */
+#else
+	nop
+#endif
+	b       syscall_check_bh  /* if resched, we start over again */
+	nop
+
+	.import do_signal,code
+syscall_do_signal:
+	/* Save callee-save registers (for sigcontext).
+	   FIXME: After this point the process structure should be
+	   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 
+	ldo	TASK_REGS(%r1), %r25		/* struct pt_regs *regs */
+	reg_save %r25
+
+	ldi	1, %r24				/* unsigned long in_syscall */
+
+#ifdef __LP64__
+	ldo	-16(%r30),%r29			/* Reference param save area */
+#endif
+	BL	do_signal,%r2
+	copy	%r0, %r26			/* sigset_t *oldset = NULL */
+
+	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
+	ldo	TASK_REGS(%r1), %r20		/* reload pt_regs */
+	reg_restore %r20
+
+	b,n     syscall_check_sig
+
+	/*
+	 * get_register is used by the non access tlb miss handlers to
+	 * copy the value of the general register specified in r8 into
+	 * r1. This routine can't be used for shadowed registers, since
+	 * the rfir will restore the original value. So, for the shadowed
+	 * registers we put a -1 into r1 to indicate that the register
+	 * should not be used (the register being copied could also have
+	 * a -1 in it, but that is OK, it just means that we will have
+	 * to use the slow path instead).
+	 */
+
+get_register:
+	blr     %r8,%r0
+	nop
+	bv      %r0(%r25)    /* r0 */
+	copy    %r0,%r1
+	bv      %r0(%r25)    /* r1 - shadowed */
+	ldi     -1,%r1
+	bv      %r0(%r25)    /* r2 */
+	copy    %r2,%r1
+	bv      %r0(%r25)    /* r3 */
+	copy    %r3,%r1
+	bv      %r0(%r25)    /* r4 */
+	copy    %r4,%r1
+	bv      %r0(%r25)    /* r5 */
+	copy    %r5,%r1
+	bv      %r0(%r25)    /* r6 */
+	copy    %r6,%r1
+	bv      %r0(%r25)    /* r7 */
+	copy    %r7,%r1
+	bv      %r0(%r25)    /* r8 - shadowed */
+	ldi     -1,%r1
+	bv      %r0(%r25)    /* r9 - shadowed */
+	ldi     -1,%r1
+	bv      %r0(%r25)    /* r10 */
+	copy    %r10,%r1
+	bv      %r0(%r25)    /* r11 */
+	copy    %r11,%r1
+	bv      %r0(%r25)    /* r12 */
+	copy    %r12,%r1
+	bv      %r0(%r25)    /* r13 */
+	copy    %r13,%r1
+	bv      %r0(%r25)    /* r14 */
+	copy    %r14,%r1
+	bv      %r0(%r25)    /* r15 */
+	copy    %r15,%r1
+	bv      %r0(%r25)    /* r16 - shadowed */
+	ldi     -1,%r1
+	bv      %r0(%r25)    /* r17 - shadowed */
+	ldi     -1,%r1
+	bv      %r0(%r25)    /* r18 */
+	copy    %r18,%r1
+	bv      %r0(%r25)    /* r19 */
+	copy    %r19,%r1
+	bv      %r0(%r25)    /* r20 */
+	copy    %r20,%r1
+	bv      %r0(%r25)    /* r21 */
+	copy    %r21,%r1
+	bv      %r0(%r25)    /* r22 */
+	copy    %r22,%r1
+	bv      %r0(%r25)    /* r23 */
+	copy    %r23,%r1
+	bv      %r0(%r25)    /* r24 - shadowed */
+	ldi     -1,%r1
+	bv      %r0(%r25)    /* r25 - shadowed */
+	ldi     -1,%r1
+	bv      %r0(%r25)    /* r26 */
+	copy    %r26,%r1
+	bv      %r0(%r25)    /* r27 */
+	copy    %r27,%r1
+	bv      %r0(%r25)    /* r28 */
+	copy    %r28,%r1
+	bv      %r0(%r25)    /* r29 */
+	copy    %r29,%r1
+	bv      %r0(%r25)    /* r30 */
+	copy    %r30,%r1
+	bv      %r0(%r25)    /* r31 */
+	copy    %r31,%r1
+
+	/*
+	 * set_register is used by the non access tlb miss handlers to
+	 * copy the value of r1 into the general register specified in
+	 * r8.
+	 */
+
+set_register:
+	blr     %r8,%r0
+	nop
+	bv      %r0(%r25)    /* r0 (silly, but it is a place holder) */
+	copy    %r1,%r0
+	bv      %r0(%r25)    /* r1 */
+	copy    %r1,%r1
+	bv      %r0(%r25)    /* r2 */
+	copy    %r1,%r2
+	bv      %r0(%r25)    /* r3 */
+	copy    %r1,%r3
+	bv      %r0(%r25)    /* r4 */
+	copy    %r1,%r4
+	bv      %r0(%r25)    /* r5 */
+	copy    %r1,%r5
+	bv      %r0(%r25)    /* r6 */
+	copy    %r1,%r6
+	bv      %r0(%r25)    /* r7 */
+	copy    %r1,%r7
+	bv      %r0(%r25)    /* r8 */
+	copy    %r1,%r8
+	bv      %r0(%r25)    /* r9 */
+	copy    %r1,%r9
+	bv      %r0(%r25)    /* r10 */
+	copy    %r1,%r10
+	bv      %r0(%r25)    /* r11 */
+	copy    %r1,%r11
+	bv      %r0(%r25)    /* r12 */
+	copy    %r1,%r12
+	bv      %r0(%r25)    /* r13 */
+	copy    %r1,%r13
+	bv      %r0(%r25)    /* r14 */
+	copy    %r1,%r14
+	bv      %r0(%r25)    /* r15 */
+	copy    %r1,%r15
+	bv      %r0(%r25)    /* r16 */
+	copy    %r1,%r16
+	bv      %r0(%r25)    /* r17 */
+	copy    %r1,%r17
+	bv      %r0(%r25)    /* r18 */
+	copy    %r1,%r18
+	bv      %r0(%r25)    /* r19 */
+	copy    %r1,%r19
+	bv      %r0(%r25)    /* r20 */
+	copy    %r1,%r20
+	bv      %r0(%r25)    /* r21 */
+	copy    %r1,%r21
+	bv      %r0(%r25)    /* r22 */
+	copy    %r1,%r22
+	bv      %r0(%r25)    /* r23 */
+	copy    %r1,%r23
+	bv      %r0(%r25)    /* r24 */
+	copy    %r1,%r24
+	bv      %r0(%r25)    /* r25 */
+	copy    %r1,%r25
+	bv      %r0(%r25)    /* r26 */
+	copy    %r1,%r26
+	bv      %r0(%r25)    /* r27 */
+	copy    %r1,%r27
+	bv      %r0(%r25)    /* r28 */
+	copy    %r1,%r28
+	bv      %r0(%r25)    /* r29 */
+	copy    %r1,%r29
+	bv      %r0(%r25)    /* r30 */
+	copy    %r1,%r30
+	bv      %r0(%r25)    /* r31 */
+	copy    %r1,%r31