powerpc: merge idle_power4.S and trapc.s

Use idle_power4.S from ppc64 as we are not going to support
32 bit power4 in the merged tree.

Merge ppc64 traps.c into powerpc traps.c:
	use ppc64 versions of exception routine names
		(as they don't have StudlyCaps)
	make all the versions if die() have the same
		prototype

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

3 files changed, 8 insertions, 647 deletions

diff --git a/arch/ppc64/kernel/Makefile b/arch/ppc64/kernel/Makefile
index 16e34de3417..9457fe63d12 100644
--- a/arch/ppc64/kernel/Makefile
+++ b/arch/ppc64/kernel/Makefile
@@ -2,6 +2,8 @@
 # Makefile for the linux ppc64 kernel.
 #
 
+ifneq ($(CONFIG_PPC_MERGE),y)
+
 EXTRA_CFLAGS	+= -mno-minimal-toc
 extra-y		:= head.o vmlinux.lds
 
@@ -77,3 +79,9 @@ endif
 # These are here while we do the architecture merge
 vecemu-y			+= ../../powerpc/kernel/vecemu.o
 vector-y			+= ../../powerpc/kernel/vector.o
+idle_power4-y			+= ../../powerpc/kernel/idle_power4.o
+traps-y				+= ../../powerpc/kernel/traps.o
+
+else
+
+endif
diff --git a/arch/ppc64/kernel/idle_power4.S b/arch/ppc64/kernel/idle_power4.S
deleted file mode 100644
index ca02afe2a79..00000000000
--- a/arch/ppc64/kernel/idle_power4.S
+++ /dev/null
@@ -1,79 +0,0 @@
-/*
- *  This file contains the power_save function for 6xx & 7xxx CPUs
- *  rewritten in assembler
- *
- *  Warning ! This code assumes that if your machine has a 750fx
- *  it will have PLL 1 set to low speed mode (used during NAP/DOZE).
- *  if this is not the case some additional changes will have to
- *  be done to check a runtime var (a bit like powersave-nap)
- *
- *  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/threads.h>
-#include <asm/processor.h>
-#include <asm/page.h>
-#include <asm/cputable.h>
-#include <asm/thread_info.h>
-#include <asm/ppc_asm.h>
-#include <asm/asm-offsets.h>
-
-#undef DEBUG
-
-	.text
-
-/*
- * Here is the power_save_6xx function. This could eventually be
- * split into several functions & changing the function pointer
- * depending on the various features.
- */
-_GLOBAL(power4_idle)
-BEGIN_FTR_SECTION
-	blr
-END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP)
-	/* We must dynamically check for the NAP feature as it
-	 * can be cleared by CPU init after the fixups are done
-	 */
-	LOADBASE(r3,cur_cpu_spec)
-	ld	r4,cur_cpu_spec@l(r3)
-	ld	r4,CPU_SPEC_FEATURES(r4)
-	andi.	r0,r4,CPU_FTR_CAN_NAP
-	beqlr
-	/* Now check if user or arch enabled NAP mode */
-	LOADBASE(r3,powersave_nap)
-	lwz	r4,powersave_nap@l(r3)
-	cmpwi	0,r4,0
-	beqlr
-
-	/* Clear MSR:EE */
-	mfmsr	r7
-	li	r4,0
-	ori	r4,r4,MSR_EE
-	andc	r0,r7,r4
-	mtmsrd	r0
-
-	/* Check current_thread_info()->flags */
-	clrrdi	r4,r1,THREAD_SHIFT
-	ld	r4,TI_FLAGS(r4)
-	andi.	r0,r4,_TIF_NEED_RESCHED
-	beq	1f
-	mtmsrd	r7	/* out of line this ? */
-	blr
-1:	
-	/* Go to NAP now */	
-BEGIN_FTR_SECTION
-	DSSALL
-	sync
-END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
-	oris	r7,r7,MSR_POW@h
-	sync
-	isync
-	mtmsrd	r7
-	isync
-	sync
-	blr
-	
diff --git a/arch/ppc64/kernel/traps.c b/arch/ppc64/kernel/traps.c
deleted file mode 100644
index a728c9f0b53..00000000000
--- a/arch/ppc64/kernel/traps.c
+++ /dev/null
@@ -1,568 +0,0 @@
-/*
- *  linux/arch/ppc64/kernel/traps.c
- *
- *  Copyright (C) 1995-1996  Gary Thomas (gdt@linuxppc.org)
- *
- *  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.
- *
- *  Modified by Cort Dougan (cort@cs.nmt.edu)
- *  and Paul Mackerras (paulus@cs.anu.edu.au)
- */
-
-/*
- * This file handles the architecture-dependent parts of hardware exceptions
- */
-
-#include <linux/config.h>
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/stddef.h>
-#include <linux/unistd.h>
-#include <linux/slab.h>
-#include <linux/user.h>
-#include <linux/a.out.h>
-#include <linux/interrupt.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/kprobes.h>
-#include <asm/kdebug.h>
-
-#include <asm/pgtable.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/processor.h>
-#include <asm/ppcdebug.h>
-#include <asm/rtas.h>
-#include <asm/systemcfg.h>
-#include <asm/machdep.h>
-#include <asm/pmc.h>
-
-#ifdef CONFIG_DEBUGGER
-int (*__debugger)(struct pt_regs *regs);
-int (*__debugger_ipi)(struct pt_regs *regs);
-int (*__debugger_bpt)(struct pt_regs *regs);
-int (*__debugger_sstep)(struct pt_regs *regs);
-int (*__debugger_iabr_match)(struct pt_regs *regs);
-int (*__debugger_dabr_match)(struct pt_regs *regs);
-int (*__debugger_fault_handler)(struct pt_regs *regs);
-
-EXPORT_SYMBOL(__debugger);
-EXPORT_SYMBOL(__debugger_ipi);
-EXPORT_SYMBOL(__debugger_bpt);
-EXPORT_SYMBOL(__debugger_sstep);
-EXPORT_SYMBOL(__debugger_iabr_match);
-EXPORT_SYMBOL(__debugger_dabr_match);
-EXPORT_SYMBOL(__debugger_fault_handler);
-#endif
-
-struct notifier_block *powerpc_die_chain;
-static DEFINE_SPINLOCK(die_notifier_lock);
-
-int register_die_notifier(struct notifier_block *nb)
-{
-	int err = 0;
-	unsigned long flags;
-
-	spin_lock_irqsave(&die_notifier_lock, flags);
-	err = notifier_chain_register(&powerpc_die_chain, nb);
-	spin_unlock_irqrestore(&die_notifier_lock, flags);
-	return err;
-}
-
-/*
- * Trap & Exception support
- */
-
-static DEFINE_SPINLOCK(die_lock);
-
-int die(const char *str, struct pt_regs *regs, long err)
-{
-	static int die_counter;
-	int nl = 0;
-
-	if (debugger(regs))
-		return 1;
-
-	console_verbose();
-	spin_lock_irq(&die_lock);
-	bust_spinlocks(1);
-	printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter);
-#ifdef CONFIG_PREEMPT
-	printk("PREEMPT ");
-	nl = 1;
-#endif
-#ifdef CONFIG_SMP
-	printk("SMP NR_CPUS=%d ", NR_CPUS);
-	nl = 1;
-#endif
-#ifdef CONFIG_DEBUG_PAGEALLOC
-	printk("DEBUG_PAGEALLOC ");
-	nl = 1;
-#endif
-#ifdef CONFIG_NUMA
-	printk("NUMA ");
-	nl = 1;
-#endif
-	switch(systemcfg->platform) {
-		case PLATFORM_PSERIES:
-			printk("PSERIES ");
-			nl = 1;
-			break;
-		case PLATFORM_PSERIES_LPAR:
-			printk("PSERIES LPAR ");
-			nl = 1;
-			break;
-		case PLATFORM_ISERIES_LPAR:
-			printk("ISERIES LPAR ");
-			nl = 1;
-			break;
-		case PLATFORM_POWERMAC:
-			printk("POWERMAC ");
-			nl = 1;
-			break;
-		case PLATFORM_BPA:
-			printk("BPA ");
-			nl = 1;
-			break;
-	}
-	if (nl)
-		printk("\n");
-	print_modules();
-	show_regs(regs);
-	bust_spinlocks(0);
-	spin_unlock_irq(&die_lock);
-
-	if (in_interrupt())
-		panic("Fatal exception in interrupt");
-
-	if (panic_on_oops) {
-		printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
-		ssleep(5);
-		panic("Fatal exception");
-	}
-	do_exit(SIGSEGV);
-
-	return 0;
-}
-
-void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
-{
-	siginfo_t info;
-
-	if (!user_mode(regs)) {
-		if (die("Exception in kernel mode", regs, signr))
-			return;
-	}
-
-	memset(&info, 0, sizeof(info));
-	info.si_signo = signr;
-	info.si_code = code;
-	info.si_addr = (void __user *) addr;
-	force_sig_info(signr, &info, current);
-}
-
-void system_reset_exception(struct pt_regs *regs)
-{
-	/* See if any machine dependent calls */
-	if (ppc_md.system_reset_exception)
-		ppc_md.system_reset_exception(regs);
-
-	die("System Reset", regs, 0);
-
-	/* Must die if the interrupt is not recoverable */
-	if (!(regs->msr & MSR_RI))
-		panic("Unrecoverable System Reset");
-
-	/* What should we do here? We could issue a shutdown or hard reset. */
-}
-
-void machine_check_exception(struct pt_regs *regs)
-{
-	int recover = 0;
-
-	/* See if any machine dependent calls */
-	if (ppc_md.machine_check_exception)
-		recover = ppc_md.machine_check_exception(regs);
-
-	if (recover)
-		return;
-
-	if (debugger_fault_handler(regs))
-		return;
-	die("Machine check", regs, 0);
-
-	/* Must die if the interrupt is not recoverable */
-	if (!(regs->msr & MSR_RI))
-		panic("Unrecoverable Machine check");
-}
-
-void unknown_exception(struct pt_regs *regs)
-{
-	printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
-	       regs->nip, regs->msr, regs->trap);
-
-	_exception(SIGTRAP, regs, 0, 0);
-}
-
-void instruction_breakpoint_exception(struct pt_regs *regs)
-{
-	if (notify_die(DIE_IABR_MATCH, "iabr_match", regs, 5,
-					5, SIGTRAP) == NOTIFY_STOP)
-		return;
-	if (debugger_iabr_match(regs))
-		return;
-	_exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
-}
-
-void __kprobes single_step_exception(struct pt_regs *regs)
-{
-	regs->msr &= ~MSR_SE;  /* Turn off 'trace' bit */
-
-	if (notify_die(DIE_SSTEP, "single_step", regs, 5,
-					5, SIGTRAP) == NOTIFY_STOP)
-		return;
-	if (debugger_sstep(regs))
-		return;
-
-	_exception(SIGTRAP, regs, TRAP_TRACE, regs->nip);
-}
-
-/*
- * After we have successfully emulated an instruction, we have to
- * check if the instruction was being single-stepped, and if so,
- * pretend we got a single-step exception.  This was pointed out
- * by Kumar Gala.  -- paulus
- */
-static inline void emulate_single_step(struct pt_regs *regs)
-{
-	if (regs->msr & MSR_SE)
-		single_step_exception(regs);
-}
-
-static void parse_fpe(struct pt_regs *regs)
-{
-	int code = 0;
-	unsigned long fpscr;
-
-	flush_fp_to_thread(current);
-
-	fpscr = current->thread.fpscr;
-
-	/* Invalid operation */
-	if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX))
-		code = FPE_FLTINV;
-
-	/* Overflow */
-	else if ((fpscr & FPSCR_OE) && (fpscr & FPSCR_OX))
-		code = FPE_FLTOVF;
-
-	/* Underflow */
-	else if ((fpscr & FPSCR_UE) && (fpscr & FPSCR_UX))
-		code = FPE_FLTUND;
-
-	/* Divide by zero */
-	else if ((fpscr & FPSCR_ZE) && (fpscr & FPSCR_ZX))
-		code = FPE_FLTDIV;
-
-	/* Inexact result */
-	else if ((fpscr & FPSCR_XE) && (fpscr & FPSCR_XX))
-		code = FPE_FLTRES;
-
-	_exception(SIGFPE, regs, code, regs->nip);
-}
-
-/*
- * Illegal instruction emulation support.  Return non-zero if we can't
- * emulate, or -EFAULT if the associated memory access caused an access
- * fault.  Return zero on success.
- */
-
-#define INST_MFSPR_PVR		0x7c1f42a6
-#define INST_MFSPR_PVR_MASK	0xfc1fffff
-
-#define INST_DCBA		0x7c0005ec
-#define INST_DCBA_MASK		0x7c0007fe
-
-#define INST_MCRXR		0x7c000400
-#define INST_MCRXR_MASK		0x7c0007fe
-
-static int emulate_instruction(struct pt_regs *regs)
-{
-	unsigned int instword;
-
-	if (!user_mode(regs))
-		return -EINVAL;
-
-	CHECK_FULL_REGS(regs);
-
-	if (get_user(instword, (unsigned int __user *)(regs->nip)))
-		return -EFAULT;
-
-	/* Emulate the mfspr rD, PVR. */
-	if ((instword & INST_MFSPR_PVR_MASK) == INST_MFSPR_PVR) {
-		unsigned int rd;
-
-		rd = (instword >> 21) & 0x1f;
-		regs->gpr[rd] = mfspr(SPRN_PVR);
-		return 0;
-	}
-
-	/* Emulating the dcba insn is just a no-op.  */
-	if ((instword & INST_DCBA_MASK) == INST_DCBA) {
-		static int warned;
-
-		if (!warned) {
-			printk(KERN_WARNING
-			       "process %d (%s) uses obsolete 'dcba' insn\n",
-			       current->pid, current->comm);
-			warned = 1;
-		}
-		return 0;
-	}
-
-	/* Emulate the mcrxr insn.  */
-	if ((instword & INST_MCRXR_MASK) == INST_MCRXR) {
-		static int warned;
-		unsigned int shift;
-
-		if (!warned) {
-			printk(KERN_WARNING
-			       "process %d (%s) uses obsolete 'mcrxr' insn\n",
-			       current->pid, current->comm);
-			warned = 1;
-		}
-
-		shift = (instword >> 21) & 0x1c;
-		regs->ccr &= ~(0xf0000000 >> shift);
-		regs->ccr |= (regs->xer & 0xf0000000) >> shift;
-		regs->xer &= ~0xf0000000;
-		return 0;
-	}
-
-	return -EINVAL;
-}
-
-/*
- * Look through the list of trap instructions that are used for BUG(),
- * BUG_ON() and WARN_ON() and see if we hit one.  At this point we know
- * that the exception was caused by a trap instruction of some kind.
- * Returns 1 if we should continue (i.e. it was a WARN_ON) or 0
- * otherwise.
- */
-extern struct bug_entry __start___bug_table[], __stop___bug_table[];
-
-#ifndef CONFIG_MODULES
-#define module_find_bug(x)	NULL
-#endif
-
-struct bug_entry *find_bug(unsigned long bugaddr)
-{
-	struct bug_entry *bug;
-
-	for (bug = __start___bug_table; bug < __stop___bug_table; ++bug)
-		if (bugaddr == bug->bug_addr)
-			return bug;
-	return module_find_bug(bugaddr);
-}
-
-static int
-check_bug_trap(struct pt_regs *regs)
-{
-	struct bug_entry *bug;
-	unsigned long addr;
-
-	if (regs->msr & MSR_PR)
-		return 0;	/* not in kernel */
-	addr = regs->nip;	/* address of trap instruction */
-	if (addr < PAGE_OFFSET)
-		return 0;
-	bug = find_bug(regs->nip);
-	if (bug == NULL)
-		return 0;
-	if (bug->line & BUG_WARNING_TRAP) {
-		/* this is a WARN_ON rather than BUG/BUG_ON */
-		printk(KERN_ERR "Badness in %s at %s:%d\n",
-		       bug->function, bug->file,
-		       bug->line & ~BUG_WARNING_TRAP);
-		show_stack(current, (void *)regs->gpr[1]);
-		return 1;
-	}
-	printk(KERN_CRIT "kernel BUG in %s at %s:%d!\n",
-	       bug->function, bug->file, bug->line);
-	return 0;
-}
-
-void __kprobes program_check_exception(struct pt_regs *regs)
-{
-	if (debugger_fault_handler(regs))
-		return;
-
-	if (regs->msr & 0x100000) {
-		/* IEEE FP exception */
-		parse_fpe(regs);
-	} else if (regs->msr & 0x20000) {
-		/* trap exception */
-
-		if (notify_die(DIE_BPT, "breakpoint", regs, 5,
-					5, SIGTRAP) == NOTIFY_STOP)
-			return;
-		if (debugger_bpt(regs))
-			return;
-
-		if (check_bug_trap(regs)) {
-			regs->nip += 4;
-			return;
-		}
-		_exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
-
-	} else {
-		/* Privileged or illegal instruction; try to emulate it. */
-		switch (emulate_instruction(regs)) {
-		case 0:
-			regs->nip += 4;
-			emulate_single_step(regs);
-			break;
-
-		case -EFAULT:
-			_exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
-			break;
-
-		default:
-			if (regs->msr & 0x40000)
-				/* priveleged */
-				_exception(SIGILL, regs, ILL_PRVOPC, regs->nip);
-			else
-				/* illegal */
-				_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
-			break;
-		}
-	}
-}
-
-void kernel_fp_unavailable_exception(struct pt_regs *regs)
-{
-	printk(KERN_EMERG "Unrecoverable FP Unavailable Exception "
-			  "%lx at %lx\n", regs->trap, regs->nip);
-	die("Unrecoverable FP Unavailable Exception", regs, SIGABRT);
-}
-
-void altivec_unavailable_exception(struct pt_regs *regs)
-{
-	if (user_mode(regs)) {
-		/* A user program has executed an altivec instruction,
-		   but this kernel doesn't support altivec. */
-		_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
-		return;
-	}
-	printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception "
-			  "%lx at %lx\n", regs->trap, regs->nip);
-	die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);
-}
-
-extern perf_irq_t perf_irq;
-
-void performance_monitor_exception(struct pt_regs *regs)
-{
-	perf_irq(regs);
-}
-
-void alignment_exception(struct pt_regs *regs)
-{
-	int fixed;
-
-	fixed = fix_alignment(regs);
-
-	if (fixed == 1) {
-		regs->nip += 4;	/* skip over emulated instruction */
-		emulate_single_step(regs);
-		return;
-	}
-
-	/* Operand address was bad */	
-	if (fixed == -EFAULT) {
-		if (user_mode(regs)) {
-			_exception(SIGSEGV, regs, SEGV_MAPERR, regs->dar);
-		} else {
-			/* Search exception table */
-			bad_page_fault(regs, regs->dar, SIGSEGV);
-		}
-
-		return;
-	}
-
-	_exception(SIGBUS, regs, BUS_ADRALN, regs->nip);
-}
-
-#ifdef CONFIG_ALTIVEC
-void altivec_assist_exception(struct pt_regs *regs)
-{
-	int err;
-	siginfo_t info;
-
-	if (!user_mode(regs)) {
-		printk(KERN_EMERG "VMX/Altivec assist exception in kernel mode"
-		       " at %lx\n", regs->nip);
-		die("Kernel VMX/Altivec assist exception", regs, SIGILL);
-	}
-
-	flush_altivec_to_thread(current);
-
-	err = emulate_altivec(regs);
-	if (err == 0) {
-		regs->nip += 4;		/* skip emulated instruction */
-		emulate_single_step(regs);
-		return;
-	}
-
-	if (err == -EFAULT) {
-		/* got an error reading the instruction */
-		info.si_signo = SIGSEGV;
-		info.si_errno = 0;
-		info.si_code = SEGV_MAPERR;
-		info.si_addr = (void __user *) regs->nip;
-		force_sig_info(SIGSEGV, &info, current);
-	} else {
-		/* didn't recognize the instruction */
-		/* XXX quick hack for now: set the non-Java bit in the VSCR */
-		if (printk_ratelimit())
-			printk(KERN_ERR "Unrecognized altivec instruction "
-			       "in %s at %lx\n", current->comm, regs->nip);
-		current->thread.vscr.u[3] |= 0x10000;
-	}
-}
-#endif /* CONFIG_ALTIVEC */
-
-/*
- * We enter here if we get an unrecoverable exception, that is, one
- * that happened at a point where the RI (recoverable interrupt) bit
- * in the MSR is 0.  This indicates that SRR0/1 are live, and that
- * we therefore lost state by taking this exception.
- */
-void unrecoverable_exception(struct pt_regs *regs)
-{
-	printk(KERN_EMERG "Unrecoverable exception %lx at %lx\n",
-	       regs->trap, regs->nip);
-	die("Unrecoverable exception", regs, SIGABRT);
-}
-
-/*
- * We enter here if we discover during exception entry that we are
- * running in supervisor mode with a userspace value in the stack pointer.
- */
-void kernel_bad_stack(struct pt_regs *regs)
-{
-	printk(KERN_EMERG "Bad kernel stack pointer %lx at %lx\n",
-	       regs->gpr[1], regs->nip);
-	die("Bad kernel stack pointer", regs, SIGABRT);
-}
-
-void __init trap_init(void)
-{
-}