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Date:      Thu, 30 Jul 2009 21:51:07 +0000 (UTC)
From:      Nathan Whitehorn <nwhitehorn@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-projects@freebsd.org
Subject:   svn commit: r195982 - in projects/ppc64/sys: conf powerpc/aim powerpc/aim64 powerpc/include
Message-ID:  <200907302151.n6ULp7QX046959@svn.freebsd.org>

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Author: nwhitehorn
Date: Thu Jul 30 21:51:07 2009
New Revision: 195982
URL: http://svn.freebsd.org/changeset/base/195982

Log:
  The kernel now tries (and fails, since there isn't one) to start init
  after some more hacking with TOC pointers and with setfault().
  
  More irritatingly, to deal with certain broken implementations of this
  architecture (I'm looking at you, Cell) that only implement a 65-bit
  virtual address space, I've had to reduce the accessible effective
  address range to 45 bits. This needs a lot of reexamination, and fixing
  it properly will probably involve some kind of global VSID hash table.

Deleted:
  projects/ppc64/sys/powerpc/aim64/copyinout.c
Modified:
  projects/ppc64/sys/conf/files.powerpc64
  projects/ppc64/sys/powerpc/aim/copyinout.c
  projects/ppc64/sys/powerpc/aim/trap.c
  projects/ppc64/sys/powerpc/aim/vm_machdep.c
  projects/ppc64/sys/powerpc/aim64/locore.S
  projects/ppc64/sys/powerpc/aim64/machdep.c
  projects/ppc64/sys/powerpc/aim64/mmu_oea64.c
  projects/ppc64/sys/powerpc/aim64/trap_subr.S
  projects/ppc64/sys/powerpc/include/frame.h
  projects/ppc64/sys/powerpc/include/pcb.h

Modified: projects/ppc64/sys/conf/files.powerpc64
==============================================================================
--- projects/ppc64/sys/conf/files.powerpc64	Thu Jul 30 21:00:20 2009	(r195981)
+++ projects/ppc64/sys/conf/files.powerpc64	Thu Jul 30 21:51:07 2009	(r195982)
@@ -54,6 +54,7 @@ libkern/flsl.c			standard
 libkern/memmove.c		standard
 libkern/memset.c		standard
 powerpc/aim/clock.c		optional	aim
+powerpc/aim/copyinout.c		optional	aim
 powerpc/aim/interrupt.c		optional	aim
 powerpc/aim/mp_cpudep.c		optional	aim smp
 powerpc/aim/nexus.c		optional	aim
@@ -63,7 +64,6 @@ powerpc/aim/platform_chrp.c	optional	aim
 powerpc/aim/trap.c		optional	aim
 powerpc/aim/uma_machdep.c	optional	aim
 powerpc/aim/vm_machdep.c	optional	aim
-powerpc/aim64/copyinout.c	optional	aim
 powerpc/aim64/locore.S		optional	aim no-obj
 powerpc/aim64/machdep.c		optional	aim
 powerpc/aim64/mmu_oea64.c	optional	aim

Modified: projects/ppc64/sys/powerpc/aim/copyinout.c
==============================================================================
--- projects/ppc64/sys/powerpc/aim/copyinout.c	Thu Jul 30 21:00:20 2009	(r195981)
+++ projects/ppc64/sys/powerpc/aim/copyinout.c	Thu Jul 30 21:51:07 2009	(r195982)
@@ -72,6 +72,33 @@ int	setfault(faultbuf);	/* defined in lo
 /*
  * Makes sure that the right segment of userspace is mapped in.
  */
+static __inline register_t
+va_to_vsid(pmap_t pm, const volatile void *va)
+{
+        #ifdef __powerpc64__
+        return (((uint64_t)pm->pm_context << 17) |
+            ((uintptr_t)va >> ADDR_SR_SHFT));
+        #else
+        return ((pm->pm_sr[(uintptr_t)va >> ADDR_SR_SHFT]) & SR_VSID_MASK);
+        #endif
+}
+
+#ifdef __powerpc64__
+static __inline void
+set_user_sr(register_t vsid)
+{
+	register_t esid, slb1, slb2;
+
+	esid = USER_SR;
+
+	slb1 = vsid << 12;
+	slb2 = (((esid << 1) | 1UL) << 27) | USER_SR;
+
+	__asm __volatile ("slbie %0; slbmte %1, %2" :: "r"(esid << 28),
+	    "r"(slb1), "r"(slb2));
+	isync();
+}
+#else
 static __inline void
 set_user_sr(register_t vsid)
 {
@@ -80,6 +107,7 @@ set_user_sr(register_t vsid)
 	__asm __volatile ("mtsr %0,%1" :: "n"(USER_SR), "r"(vsid));
 	isync();
 }
+#endif
 
 int
 copyout(const void *kaddr, void *udaddr, size_t len)
@@ -103,13 +131,13 @@ copyout(const void *kaddr, void *udaddr,
 	up = udaddr;
 
 	while (len > 0) {
-		p = (char *)USER_ADDR + ((u_int)up & ~SEGMENT_MASK);
+		p = (char *)USER_ADDR + ((uintptr_t)up & ~SEGMENT_MASK);
 
 		l = ((char *)USER_ADDR + SEGMENT_LENGTH) - p;
 		if (l > len)
 			l = len;
 
-		set_user_sr(pm->pm_sr[(u_int)up >> ADDR_SR_SHFT]);
+		set_user_sr(va_to_vsid(pm,up));
 
 		bcopy(kp, p, l);
 
@@ -144,13 +172,13 @@ copyin(const void *udaddr, void *kaddr, 
 	up = udaddr;
 
 	while (len > 0) {
-		p = (char *)USER_ADDR + ((u_int)up & ~SEGMENT_MASK);
+		p = (char *)USER_ADDR + ((uintptr_t)up & ~SEGMENT_MASK);
 
 		l = ((char *)USER_ADDR + SEGMENT_LENGTH) - p;
 		if (l > len)
 			l = len;
 
-		set_user_sr(pm->pm_sr[(u_int)up >> ADDR_SR_SHFT]);
+		set_user_sr(va_to_vsid(pm,up));
 
 		bcopy(p, kp, l);
 
@@ -218,14 +246,14 @@ subyte(void *addr, int byte)
 
 	td = PCPU_GET(curthread);
 	pm = &td->td_proc->p_vmspace->vm_pmap;
-	p = (char *)((u_int)USER_ADDR + ((u_int)addr & ~SEGMENT_MASK));
+	p = (char *)((uintptr_t)USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
 
 	if (setfault(env)) {
 		td->td_pcb->pcb_onfault = NULL;
 		return (-1);
 	}
 
-	set_user_sr(pm->pm_sr[(u_int)addr >> ADDR_SR_SHFT]);
+	set_user_sr(va_to_vsid(pm,addr));
 
 	*p = (char)byte;
 
@@ -233,6 +261,33 @@ subyte(void *addr, int byte)
 	return (0);
 }
 
+#ifdef __powerpc64__
+int
+suword32(void *addr, int word)
+{
+	struct		thread *td;
+	pmap_t		pm;
+	faultbuf	env;
+	int		*p;
+
+	td = PCPU_GET(curthread);
+	pm = &td->td_proc->p_vmspace->vm_pmap;
+	p = (int *)((uintptr_t)USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
+
+	if (setfault(env)) {
+		td->td_pcb->pcb_onfault = NULL;
+		return (-1);
+	}
+
+	set_user_sr(pm->pm_sr[(uintptr_t)addr >> ADDR_SR_SHFT]);
+
+	*p = word;
+
+	td->td_pcb->pcb_onfault = NULL;
+	return (0);
+}
+#endif
+
 int
 suword(void *addr, long word)
 {
@@ -243,14 +298,14 @@ suword(void *addr, long word)
 
 	td = PCPU_GET(curthread);
 	pm = &td->td_proc->p_vmspace->vm_pmap;
-	p = (long *)((u_int)USER_ADDR + ((u_int)addr & ~SEGMENT_MASK));
+	p = (long *)((uintptr_t)USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
 
 	if (setfault(env)) {
 		td->td_pcb->pcb_onfault = NULL;
 		return (-1);
 	}
 
-	set_user_sr(pm->pm_sr[(u_int)addr >> ADDR_SR_SHFT]);
+	set_user_sr(va_to_vsid(pm,addr));
 
 	*p = word;
 
@@ -258,12 +313,19 @@ suword(void *addr, long word)
 	return (0);
 }
 
+#ifdef __powerpc64__
+int
+suword64(void *addr, int64_t word)
+{
+	return (suword(addr, (long)word));
+}
+#else
 int
 suword32(void *addr, int32_t word)
 {
 	return (suword(addr, (long)word));
 }
-
+#endif
 
 int
 fubyte(const void *addr)
@@ -276,14 +338,15 @@ fubyte(const void *addr)
 
 	td = PCPU_GET(curthread);
 	pm = &td->td_proc->p_vmspace->vm_pmap;
-	p = (u_char *)((u_int)USER_ADDR + ((u_int)addr & ~SEGMENT_MASK));
+	p = (u_char *)((uintptr_t)USER_ADDR +
+	    ((uintptr_t)addr & ~SEGMENT_MASK));
 
 	if (setfault(env)) {
 		td->td_pcb->pcb_onfault = NULL;
 		return (-1);
 	}
 
-	set_user_sr(pm->pm_sr[(u_int)addr >> ADDR_SR_SHFT]);
+	set_user_sr(va_to_vsid(pm,addr));
 
 	val = *p;
 
@@ -301,14 +364,14 @@ fuword(const void *addr)
 
 	td = PCPU_GET(curthread);
 	pm = &td->td_proc->p_vmspace->vm_pmap;
-	p = (long *)((u_int)USER_ADDR + ((u_int)addr & ~SEGMENT_MASK));
+	p = (long *)((uintptr_t)USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
 
 	if (setfault(env)) {
 		td->td_pcb->pcb_onfault = NULL;
 		return (-1);
 	}
 
-	set_user_sr(pm->pm_sr[(u_int)addr >> ADDR_SR_SHFT]);
+	set_user_sr(va_to_vsid(pm,addr));
 
 	val = *p;
 
@@ -338,9 +401,10 @@ casuword(volatile u_long *addr, u_long o
 
 	td = PCPU_GET(curthread);
 	pm = &td->td_proc->p_vmspace->vm_pmap;
-	p = (u_long *)((u_int)USER_ADDR + ((u_int)addr & ~SEGMENT_MASK));
+	p = (u_long *)((uintptr_t)USER_ADDR +
+	    ((uintptr_t)addr & ~SEGMENT_MASK));
 
-	set_user_sr(pm->pm_sr[(u_int)addr >> ADDR_SR_SHFT]);
+	set_user_sr(va_to_vsid(pm,addr));
 
 	if (setfault(env)) {
 		td->td_pcb->pcb_onfault = NULL;

Modified: projects/ppc64/sys/powerpc/aim/trap.c
==============================================================================
--- projects/ppc64/sys/powerpc/aim/trap.c	Thu Jul 30 21:00:20 2009	(r195981)
+++ projects/ppc64/sys/powerpc/aim/trap.c	Thu Jul 30 21:51:07 2009	(r195982)
@@ -105,7 +105,9 @@ static struct powerpc_exception powerpc_
 	{ 0x0100, "system reset" },
 	{ 0x0200, "machine check" },
 	{ 0x0300, "data storage interrupt" },
+	{ 0x0380, "data segment exception" },
 	{ 0x0400, "instruction storage interrupt" },
+	{ 0x0480, "instruction segment exception" },
 	{ 0x0500, "external interrupt" },
 	{ 0x0600, "alignment" },
 	{ 0x0700, "program" },
@@ -493,7 +495,7 @@ trap_pfault(struct trapframe *frame, int
 	vm_map_t	map;
 	vm_prot_t	ftype;
 	int		rv;
-	u_int		user_sr;
+	register_t	user_sr;
 
 	td = curthread;
 	p = td->td_proc;
@@ -515,9 +517,16 @@ trap_pfault(struct trapframe *frame, int
 			if (p->p_vmspace == NULL)
 				return (SIGSEGV);
 
+			#ifdef __powerpc64__
+			user_sr = 0;
+			__asm ("slbmfev %0, %1"
+			    : "=r"(user_sr)
+			    : "r"(USER_SR));
+			#else
 			__asm ("mfsr %0, %1"
 			    : "=r"(user_sr)
 			    : "K"(USER_SR));
+			#endif
 			eva &= ADDR_PIDX | ADDR_POFF;
 			eva |= user_sr << ADDR_SR_SHFT;
 			map = &p->p_vmspace->vm_map;

Modified: projects/ppc64/sys/powerpc/aim/vm_machdep.c
==============================================================================
--- projects/ppc64/sys/powerpc/aim/vm_machdep.c	Thu Jul 30 21:00:20 2009	(r195981)
+++ projects/ppc64/sys/powerpc/aim/vm_machdep.c	Thu Jul 30 21:51:07 2009	(r195982)
@@ -129,6 +129,10 @@ static u_int sf_buf_alloc_want;
  */
 static struct mtx sf_buf_lock;
 
+#ifdef __powerpc64__
+extern uintptr_t tocbase;
+#endif
+
 
 /*
  * Finish a fork operation, with process p2 nearly set up.
@@ -177,6 +181,9 @@ cpu_fork(struct thread *td1, struct proc
 
 	cf = (struct callframe *)tf - 1;
 	memset(cf, 0, sizeof(struct callframe));
+	#ifdef __powerpc64__
+	cf->cf_toc = tocbase;
+	#endif
 	cf->cf_func = (register_t)fork_return;
 	cf->cf_arg0 = (register_t)td2;
 	cf->cf_arg1 = (register_t)tf;
@@ -455,7 +462,12 @@ cpu_set_upcall(struct thread *td, struct
 	cf->cf_arg1 = (register_t)tf;
 
 	pcb2->pcb_sp = (register_t)cf;
+	#ifdef __powerpc64__
+	pcb2->pcb_lr = ((register_t *)fork_trampoline)[0];
+	pcb2->pcb_toc = ((register_t *)fork_trampoline)[1];
+	#else
 	pcb2->pcb_lr = (register_t)fork_trampoline;
+	#endif
 	pcb2->pcb_cpu.aim.usr_vsid = 0;
 	pcb2->pcb_cpu.aim.usr_esid = 0;
 

Modified: projects/ppc64/sys/powerpc/aim64/locore.S
==============================================================================
--- projects/ppc64/sys/powerpc/aim64/locore.S	Thu Jul 30 21:00:20 2009	(r195981)
+++ projects/ppc64/sys/powerpc/aim64/locore.S	Thu Jul 30 21:51:07 2009	(r195982)
@@ -191,6 +191,7 @@ ASENTRY(__start)
  */
 
         .align  3
+	.globl	tocbase
 tocbase:
         .llong  .TOC.@tocbase
 
@@ -200,19 +201,19 @@ tocbase:
 
 ASENTRY(ofw_real_mode_entry)
 	mflr	0
-	lis	31,openfirmware_entry@ha
-	ld	31,openfirmware_entry@l(31) /* read client interface handler */
+	lis	4,openfirmware_entry@ha
+	ld	4,openfirmware_entry@l(4) /* read client interface handler */
 
-	mfmsr	30
-	mtsprg3	30
-	andi.	30, 30, ~(PSL_DR | PSL_IR | PSL_EE)@l
-	mtmsrd	30
+	mfmsr	5
+	mtsprg3	5
+	andi.	5, 5, ~(PSL_DR | PSL_IR | PSL_EE)@l
+	mtmsrd	5
 
-	mtctr	31
+	mtctr	4
 	bctrl
 
-	mfsprg3	30
-	mtmsrd	30
+	mfsprg3	5
+	mtmsrd	5
 	mtlr 	0
 	blr
 
@@ -228,13 +229,34 @@ ASENTRY(setfault)
 	mflr	0
 	mfcr	12
 	mfsprg	4,0
-	lwz	4,PC_CURTHREAD(4)
-	lwz	4,TD_PCB(4)
-	stw	3,PCB_ONFAULT(4)
-	stw	0,0(3)
-	stw	1,4(3)
-	stw	2,8(3)
-	stmw	12,12(3)
+	ld	4,PC_CURTHREAD(4)
+	ld	4,TD_PCB(4)
+	std	3,PCB_ONFAULT(4)
+	std	0,0(3)
+	std	1,8(3)
+	std	2,16(3)
+
+	std	%r12,24(%r3)	/* Save the non-volatile GP regs. */
+	std	%r13,24+1*8(%r3)	
+	std	%r14,24+2*8(%r3)	
+	std	%r15,24+3*8(%r3)	
+	std	%r16,24+4*8(%r3)	
+	std	%r17,24+5*8(%r3)	
+	std	%r18,24+6*8(%r3)	
+	std	%r19,24+7*8(%r3)	
+	std	%r20,24+8*8(%r3)	
+	std	%r21,24+9*8(%r3)	
+	std	%r22,24+10*8(%r3)	
+	std	%r23,24+11*8(%r3)	
+	std	%r24,24+12*8(%r3)	
+	std	%r25,24+13*8(%r3)	
+	std	%r26,24+14*8(%r3)	
+	std	%r27,24+15*8(%r3)	
+	std	%r28,24+16*8(%r3)
+	std	%r29,24+17*8(%r3)	
+	std	%r30,24+18*8(%r3)	
+	std	%r31,24+19*8(%r3)	
+
 	xor	3,3,3
 	blr
 

Modified: projects/ppc64/sys/powerpc/aim64/machdep.c
==============================================================================
--- projects/ppc64/sys/powerpc/aim64/machdep.c	Thu Jul 30 21:00:20 2009	(r195981)
+++ projects/ppc64/sys/powerpc/aim64/machdep.c	Thu Jul 30 21:51:07 2009	(r195982)
@@ -394,9 +394,9 @@ powerpc_init(u_int startkernel, u_int en
 	bcopy(&trapcode, (void *)EXC_TRC,  (size_t)&trapsize);
 	bcopy(&trapcode, (void *)EXC_BPT,  (size_t)&trapsize);
 #endif
-	bcopy(&dsitrap,  (void *)(EXC_DSI),  (size_t)&dsisize);
+	bcopy(&dsitrap,  (void *)EXC_DSI,  (size_t)&dsisize);
 	bcopy(&trapcode, (void *)EXC_DSE,  (size_t)&trapsize);
-	bcopy(&alitrap,  (void *)(EXC_ALI),  (size_t)&alisize);
+	bcopy(&alitrap,  (void *)EXC_ALI,  (size_t)&alisize);
 	bcopy(&trapcode, (void *)EXC_ISI,  (size_t)&trapsize);
 	bcopy(&trapcode, (void *)EXC_ISE,  (size_t)&trapsize);
 	bcopy(&trapcode, (void *)EXC_EXI,  (size_t)&trapsize);

Modified: projects/ppc64/sys/powerpc/aim64/mmu_oea64.c
==============================================================================
--- projects/ppc64/sys/powerpc/aim64/mmu_oea64.c	Thu Jul 30 21:00:20 2009	(r195981)
+++ projects/ppc64/sys/powerpc/aim64/mmu_oea64.c	Thu Jul 30 21:51:07 2009	(r195982)
@@ -171,7 +171,7 @@ static __inline uint64_t
 va_to_vsid(pmap_t pm, vm_offset_t va)
 {
 	#ifdef __powerpc64__
-	return (((uint64_t)pm->pm_context << 36) |
+	return (((uint64_t)pm->pm_context << 17) |
 	    ((uintptr_t)va >> ADDR_SR_SHFT));
 	#else
 	return ((pm->pm_sr[(uintptr_t)va >> ADDR_SR_SHFT]) & SR_VSID_MASK);
@@ -742,7 +742,7 @@ moea64_bridge_cpu_bootstrap(mmu_t mmup, 
 				continue;
 
 			/* The right-most bit is a validity bit */
-			slb1 = ((register_t)kernel_pmap->pm_context << 36) |
+			slb1 = ((register_t)kernel_pmap->pm_context << 17) |
 			    (kernel_pmap->pm_sr[i] >> 1);
 			slb1 <<= 12;
 			slb2 = kernel_pmap->pm_sr[i] << 27 | i;
@@ -926,7 +926,7 @@ moea64_bridge_bootstrap(mmu_t mmup, vm_o
 	/*
 	 * Initialize the kernel pmap (which is statically allocated).
 	 */
-	kernel_pmap->pm_context = 0;
+	kernel_pmap->pm_context = 0xfffff;
 	#ifdef __powerpc64__
 	for (i = 0; i < 16; i++) 
 		kernel_pmap->pm_sr[i] = (i << 1) | 1;
@@ -979,8 +979,6 @@ moea64_bridge_bootstrap(mmu_t mmup, vm_o
 	     */
 
 	    moea64_pinit(mmup, &ofw_pmap);
-	    ofw_pmap.pm_sr[KERNEL_SR] = kernel_pmap->pm_sr[KERNEL_SR];
-	    ofw_pmap.pm_sr[KERNEL2_SR] = kernel_pmap->pm_sr[KERNEL2_SR];
 
 	    if ((chosen = OF_finddevice("/chosen")) == -1)
 		panic("moea64_bootstrap: can't find /chosen");
@@ -1841,6 +1839,7 @@ moea64_pinit(mmu_t mmu, pmap_t pmap)
 		moea64_vsid_bitmap[n] |= mask;
 
 		#ifdef __powerpc64__
+printf("Assigning new context: %#x, hash %#x\n",moea64_vsidcontext,hash);
 			pmap->pm_context = hash;
 			for (i = 0; i < NSEGS; i++) 
 				pmap->pm_sr[i] = 0;

Modified: projects/ppc64/sys/powerpc/aim64/trap_subr.S
==============================================================================
--- projects/ppc64/sys/powerpc/aim64/trap_subr.S	Thu Jul 30 21:00:20 2009	(r195981)
+++ projects/ppc64/sys/powerpc/aim64/trap_subr.S	Thu Jul 30 21:51:07 2009	(r195982)
@@ -55,7 +55,7 @@ restoresrs: 
 	mr	%r28, %r27
 	lwz	%r27, PM_CONTEXT(%r27);
 instslb:
-	li	%r30, 31;
+	li	%r30, 12;
 	sld	%r30, %r27, %r30;
 	ld	%r31, PM_SR(%r28);
 
@@ -554,7 +554,7 @@ dbtrap:
 	or.	%r3,%r3,%r3
 	bne	dbleave
 /* This wasn't for KDB, so switch to real trap: */
-	ld	%r3,FRAME_EXC+8(%r1)	/* save exception */
+	ld	%r3,FRAME_EXC+16(%r1)	/* save exception */
 	GET_CPUINFO(%r4)
 	std	%r3,(PC_DBSAVE+CPUSAVE_R31)(%r4)
 	FRAME_LEAVE(PC_DBSAVE)

Modified: projects/ppc64/sys/powerpc/include/frame.h
==============================================================================
--- projects/ppc64/sys/powerpc/include/frame.h	Thu Jul 30 21:00:20 2009	(r195981)
+++ projects/ppc64/sys/powerpc/include/frame.h	Thu Jul 30 21:51:07 2009	(r195982)
@@ -79,6 +79,19 @@ struct trapframe {
 /*
  * Call frame for PowerPC used during fork.
  */
+#ifdef __powerpc64__
+struct callframe {
+	register_t	cf_dummy_fp;	/* dummy frame pointer */
+	register_t	cf_cr;
+	register_t	cf_lr;
+	register_t	cf_compiler;
+	register_t	cf_linkeditor;
+	register_t	cf_toc;
+	register_t	cf_func;
+	register_t	cf_arg0;
+	register_t	cf_arg1;
+};
+#else
 struct callframe {
 	register_t	cf_dummy_fp;	/* dummy frame pointer */
 	register_t	cf_lr;		/* space for link register save */
@@ -86,6 +99,10 @@ struct callframe {
 	register_t	cf_arg0;
 	register_t	cf_arg1;
 };
+#endif
+
+/* Definitions for syscalls */
+#define	FIRSTARG	3				/* first arg in reg 3 */
 
 /* Definitions for syscalls */
 #define	FIRSTARG	3				/* first arg in reg 3 */

Modified: projects/ppc64/sys/powerpc/include/pcb.h
==============================================================================
--- projects/ppc64/sys/powerpc/include/pcb.h	Thu Jul 30 21:00:20 2009	(r195981)
+++ projects/ppc64/sys/powerpc/include/pcb.h	Thu Jul 30 21:51:07 2009	(r195982)
@@ -35,7 +35,7 @@
 #ifndef _MACHINE_PCB_H_
 #define	_MACHINE_PCB_H_
 
-typedef int faultbuf[25];
+typedef register_t faultbuf[25];
 
 struct pcb {
 	register_t	pcb_context[20];	/* non-volatile r14-r31 */



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