powerpc: Merge traps.c a bit more

This reduces the differences between ppc32 and ppc64 in
arch/powerpc/kernel/traps.c a bit further.
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/head.S

@@ -416,7 +416,7 @@ FPUnavailable:
 	EXCEPTION_PROLOG
 	bne	load_up_fpu		/* if from user, just load it up */
 	addi	r3,r1,STACK_FRAME_OVERHEAD
-	EXC_XFER_EE_LITE(0x800, KernelFP)
+	EXC_XFER_EE_LITE(0x800, kernel_fp_unavailable_exception)
 
 /* Decrementer */
 	EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE)

arch/powerpc/kernel/traps.c

@@ -21,19 +21,17 @@
 #include <linux/mm.h>
 #include <linux/stddef.h>
 #include <linux/unistd.h>
+#include <linux/ptrace.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/prctl.h>
 #include <linux/delay.h>
 #include <linux/kprobes.h>
 #include <asm/kdebug.h>
-#ifdef CONFIG_PPC32
-#include <linux/ptrace.h>
-#include <linux/prctl.h>
-#endif
 
 #include <asm/pgtable.h>
 #include <asm/uaccess.h>
@@ -56,12 +54,6 @@
 #include <asm/pmc.h>
 #endif
 
-#ifdef CONFIG_PPC64
-#define __KPROBES	__kprobes
-#else
-#define __KPROBES
-#endif
-
 #ifdef CONFIG_DEBUGGER
 int (*__debugger)(struct pt_regs *regs);
 int (*__debugger_ipi)(struct pt_regs *regs);
@@ -111,7 +103,7 @@ int die(const char *str, struct pt_regs *regs, long err)
 	console_verbose();
 	spin_lock_irq(&die_lock);
 	bust_spinlocks(1);
-#if defined(CONFIG_PPC32) && defined(CONFIG_PMAC_BACKLIGHT)
+#ifdef CONFIG_PMAC_BACKLIGHT
 	if (_machine == _MACH_Pmac) {
 		set_backlight_enable(1);
 		set_backlight_level(BACKLIGHT_MAX);
@@ -175,11 +167,7 @@ int die(const char *str, struct pt_regs *regs, long err)
 #endif
 		panic("Fatal exception");
 	}
-#ifdef CONFIG_PPC32
 	do_exit(err);
-#else
-	do_exit(SIGSEGV);
-#endif
 
 	return 0;
 }
@@ -199,7 +187,6 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
 	info.si_addr = (void __user *) addr;
 	force_sig_info(signr, &info, current);
 
-#ifdef CONFIG_PPC32
 	/*
 	 * Init gets no signals that it doesn't have a handler for.
 	 * That's all very well, but if it has caused a synchronous
@@ -221,7 +208,6 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
 			do_exit(signr);
 		}
 	}
-#endif
 }
 
 #ifdef CONFIG_PPC64
@@ -231,7 +217,7 @@ void system_reset_exception(struct pt_regs *regs)
 	if (ppc_md.system_reset_exception)
 		ppc_md.system_reset_exception(regs);
 
-	die("System Reset", regs, 0);
+	die("System Reset", regs, SIGABRT);
 
 	/* Must die if the interrupt is not recoverable */
 	if (!(regs->msr & MSR_RI))
@@ -241,7 +227,6 @@ void system_reset_exception(struct pt_regs *regs)
 }
 #endif
 
-#ifdef CONFIG_PPC32
 /*
  * I/O accesses can cause machine checks on powermacs.
  * Check if the NIP corresponds to the address of a sync
@@ -290,7 +275,6 @@ static inline int check_io_access(struct pt_regs *regs)
 #endif /* CONFIG_PPC_PMAC */
 	return 0;
 }
-#endif /* CONFIG_PPC32 */
 
 #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
 
@@ -326,7 +310,6 @@ static inline int check_io_access(struct pt_regs *regs)
 #define clear_single_step(regs)	((regs)->msr &= ~MSR_SE)
 #endif
 
-#ifdef CONFIG_PPC32
 /*
  * This is "fall-back" implementation for configurations
  * which don't provide platform-specific machine check info
@@ -335,7 +318,6 @@ void __attribute__ ((weak))
 platform_machine_check(struct pt_regs *regs)
 {
 }
-#endif
 
 void machine_check_exception(struct pt_regs *regs)
 {
@@ -497,13 +479,7 @@ void machine_check_exception(struct pt_regs *regs)
 
 	if (debugger_fault_handler(regs))
 		return;
-	die("Machine check", regs,
-#ifdef CONFIG_PPC32
-		SIGBUS
-#else
-		0
-#endif
-	);
+	die("Machine check", regs, SIGBUS);
 
 	/* Must die if the interrupt is not recoverable */
 	if (!(regs->msr & MSR_RI))
@@ -542,13 +518,9 @@ void RunModeException(struct pt_regs *regs)
 }
 #endif
 
-void __KPROBES single_step_exception(struct pt_regs *regs)
+void __kprobes single_step_exception(struct pt_regs *regs)
 {
-#ifdef CONFIG_PPC32
 	regs->msr &= ~(MSR_SE | MSR_BE);  /* Turn off 'trace' bits */
-#else
-	regs->msr &= ~MSR_SE;  /* Turn off 'trace' bit */
-#endif
 
 	if (notify_die(DIE_SSTEP, "single_step", regs, 5,
 					5, SIGTRAP) == NOTIFY_STOP)
@@ -565,15 +537,12 @@ void __KPROBES single_step_exception(struct pt_regs *regs)
  * 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)
+static void emulate_single_step(struct pt_regs *regs)
 {
 	if (single_stepping(regs)) {
-#ifdef CONFIG_PPC32
 		clear_single_step(regs);
 		_exception(SIGTRAP, regs, TRAP_TRACE, 0);
-#else
 		single_step_exception(regs);
-#endif
 	}
 }
 
@@ -582,17 +551,7 @@ static void parse_fpe(struct pt_regs *regs)
 	int code = 0;
 	unsigned long fpscr;
 
-#ifdef CONFIG_PPC32
-	/* We must make sure the FP state is consistent with
-	 * our MSR_FP in regs
-	 */
-	preempt_disable();
-	if (regs->msr & MSR_FP)
-		giveup_fpu(current);
-	preempt_enable();
-#else
 	flush_fp_to_thread(current);
-#endif
 
 	fpscr = current->thread.fpscr;
 
@@ -737,19 +696,8 @@ static int emulate_instruction(struct pt_regs *regs)
 	}
 
 	/* Emulating the dcba insn is just a no-op.  */
-	if ((instword & INST_DCBA_MASK) == INST_DCBA) {
-#ifdef CONFIG_PPC64
-		static int warned;
-
-		if (!warned) {
-			printk(KERN_WARNING
-			       "process %d (%s) uses obsolete 'dcba' insn\n",
-			       current->pid, current->comm);
-			warned = 1;
-		}
-#endif /* CONFIG_PPC64 */
+	if ((instword & INST_DCBA_MASK) == INST_DCBA)
 		return 0;
-	}
 
 	/* Emulate the mcrxr insn.  */
 	if ((instword & INST_MCRXR_MASK) == INST_MCRXR) {
@@ -817,7 +765,7 @@ static int check_bug_trap(struct pt_regs *regs)
 		return 0;
 	if (bug->line & BUG_WARNING_TRAP) {
 		/* this is a WARN_ON rather than BUG/BUG_ON */
-#if defined(CONFIG_PPC32) && defined(CONFIG_XMON)
+#ifdef CONFIG_XMON
 		xmon_printf(KERN_ERR "Badness in %s at %s:%d\n",
 		       bug->function, bug->file,
 		       bug->line & ~BUG_WARNING_TRAP);
@@ -843,12 +791,12 @@ static int check_bug_trap(struct pt_regs *regs)
 	return 0;
 }
 
-void __KPROBES program_check_exception(struct pt_regs *regs)
+void __kprobes program_check_exception(struct pt_regs *regs)
 {
 	unsigned int reason = get_reason(regs);
-#if defined(CONFIG_PPC32) && defined(CONFIG_MATH_EMULATION)
 	extern int do_mathemu(struct pt_regs *regs);
 
+#ifdef CONFIG_MATH_EMULATION
 	/* (reason & REASON_ILLEGAL) would be the obvious thing here,
 	 * but there seems to be a hardware bug on the 405GP (RevD)
 	 * that means ESR is sometimes set incorrectly - either to
@@ -860,58 +808,45 @@ void __KPROBES program_check_exception(struct pt_regs *regs)
 		emulate_single_step(regs);
 		return;
 	}
-#endif
-
-#ifdef CONFIG_PPC64
-	if (debugger_fault_handler(regs))
-		return;
-#endif
+#endif /* CONFIG_MATH_EMULATION */
 
 	if (reason & REASON_FP) {
 		/* IEEE FP exception */
 		parse_fpe(regs);
-	} else if (reason & REASON_TRAP) {
+		return;
+	}
+	if (reason & REASON_TRAP) {
 		/* trap exception */
-#ifdef CONFIG_PPC64
 		if (notify_die(DIE_BPT, "breakpoint", regs, 5, 5, SIGTRAP)
 				== NOTIFY_STOP)
 			return;
-#endif
 		if (debugger_bpt(regs))
 			return;
 		if (check_bug_trap(regs)) {
 			regs->nip += 4;
 			return;
 		}
-		_exception(SIGTRAP, regs, TRAP_BRKPT,
-#ifdef CONFIG_PPC32
-			0
-#else
-			regs->nip
-#endif
-		);
-	} else
-#ifdef CONFIG_PPC32
-	if (reason & (REASON_ILLEGAL | REASON_PRIVILEGED))
-#endif
-	{
-		/* Privileged or illegal instruction; try to emulate it. */
+		_exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
+		return;
+	}
+
+	/* Try to emulate it if we should. */
+	if (reason & (REASON_ILLEGAL | REASON_PRIVILEGED)) {
 		switch (emulate_instruction(regs)) {
 		case 0:
 			regs->nip += 4;
 			emulate_single_step(regs);
-			break;
+			return;
 		case -EFAULT:
 			_exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
-			break;
-		default:
-			if (reason & REASON_PRIVILEGED)
-				_exception(SIGILL, regs, ILL_PRVOPC, regs->nip);
-			else
-				_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
-			break;
+			return;
 		}
 	}
+
+	if (reason & REASON_PRIVILEGED)
+		_exception(SIGILL, regs, ILL_PRVOPC, regs->nip);
+	else
+		_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
 }
 
 void alignment_exception(struct pt_regs *regs)
@@ -929,25 +864,13 @@ void alignment_exception(struct pt_regs *regs)
 	/* Operand address was bad */
 	if (fixed == -EFAULT) {
 		if (user_mode(regs))
-			_exception(SIGSEGV, regs,
-#ifdef CONFIG_PPC32
-				SEGV_ACCERR,
-#else
-				SEGV_MAPERR,
-#endif
-			regs->dar);
+			_exception(SIGSEGV, regs, SEGV_ACCERR, regs->dar);
 		else
 			/* Search exception table */
 			bad_page_fault(regs, regs->dar, SIGSEGV);
 		return;
 	}
-	_exception(SIGBUS, regs, BUS_ADRALN,
-#ifdef CONFIG_PPC32
-		regs->dar
-#else
-		regs->nip
-#endif
-	);
+	_exception(SIGBUS, regs, BUS_ADRALN, regs->dar);
 }
 
 #ifdef CONFIG_PPC32
@@ -976,18 +899,16 @@ void trace_syscall(struct pt_regs *regs)
 }
 #endif /* CONFIG_PPC32 */
 
-#ifdef CONFIG_PPC64
 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);
 }
-#endif
 
 void altivec_unavailable_exception(struct pt_regs *regs)
 {
-#if !defined(CONFIG_ALTIVEC) || defined(CONFIG_PPC64)
+#if !defined(CONFIG_ALTIVEC)
 	if (user_mode(regs)) {
 		/* A user program has executed an altivec instruction,
 		   but this kernel doesn't support altivec. */
@@ -995,22 +916,9 @@ void altivec_unavailable_exception(struct pt_regs *regs)
 		return;
 	}
 #endif
-#ifdef CONFIG_PPC32
-	{
-	static int kernel_altivec_count;
-
-	/* The kernel has executed an altivec instruction without
-	   first enabling altivec.  Whinge but let it do it. */
-	if (++kernel_altivec_count < 10)
-		printk(KERN_ERR "AltiVec used in kernel (task=%p, pc=%lx)\n",
-		       current, regs->nip);
-	regs->msr |= MSR_VEC;
-	}
-#else
 	printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception "
 			"%lx at %lx\n", regs->trap, regs->nip);
 	die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);
-#endif
 }
 
 #ifdef CONFIG_PPC64
@@ -1024,8 +932,7 @@ void performance_monitor_exception(struct pt_regs *regs)
 }
 #endif
 
-
-#if defined(CONFIG_PPC32) && defined(CONFIG_8xx)
+#ifdef CONFIG_8xx
 void SoftwareEmulation(struct pt_regs *regs)
 {
 	extern int do_mathemu(struct pt_regs *);
@@ -1054,7 +961,7 @@ void SoftwareEmulation(struct pt_regs *regs)
 	} else
 		emulate_single_step(regs);
 }
-#endif /* defined(CONFIG_PPC32) && defined(CONFIG_8xx) */
+#endif /* CONFIG_8xx */
 
 #ifdef CONFIG_PPC32
 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
@@ -1091,29 +998,14 @@ void TAUException(struct pt_regs *regs)
 void altivec_assist_exception(struct pt_regs *regs)
 {
 	int err;
-#ifdef CONFIG_PPC64
-	siginfo_t info;
-#endif
 
-#ifdef CONFIG_PPC32
-	preempt_disable();
-	if (regs->msr & MSR_VEC)
-		giveup_altivec(current);
-	preempt_enable();
-#endif
 	if (!user_mode(regs)) {
 		printk(KERN_EMERG "VMX/Altivec assist exception in kernel mode"
 		       " at %lx\n", regs->nip);
-		die("Kernel "
-#ifdef CONFIG_PPC64
-			"VMX/"
-#endif
-			"Altivec assist exception", regs, SIGILL);
+		die("Kernel VMX/Altivec assist exception", regs, SIGILL);
 	}
 
-#ifdef CONFIG_PPC64
 	flush_altivec_to_thread(current);
-#endif /* CONFIG_PPC64 */
 
 	err = emulate_altivec(regs);
 	if (err == 0) {
@@ -1124,15 +1016,7 @@ void altivec_assist_exception(struct pt_regs *regs)
 
 	if (err == -EFAULT) {
 		/* got an error reading the instruction */
-#ifdef CONFIG_PPC32
 		_exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip);
-#else
-		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);
-#endif
 	} else {
 		/* didn't recognize the instruction */
 		/* XXX quick hack for now: set the non-Java bit in the VSCR */
@@ -1144,7 +1028,6 @@ void altivec_assist_exception(struct pt_regs *regs)
 }
 #endif /* CONFIG_ALTIVEC */
 
-#ifdef CONFIG_PPC32
 #ifdef CONFIG_FSL_BOOKE
 void CacheLockingException(struct pt_regs *regs, unsigned long address,
 			   unsigned long error_code)
@@ -1194,9 +1077,7 @@ void SPEFloatingPointException(struct pt_regs *regs)
 	return;
 }
 #endif
-#endif /* CONFIG_PPC32 */
 
-#ifdef CONFIG_PPC64
 /*
  * We enter here if we get an unrecoverable exception, that is, one
  * that happened at a point where the RI (recoverable interrupt) bit
@@ -1209,9 +1090,7 @@ void unrecoverable_exception(struct pt_regs *regs)
 	       regs->trap, regs->nip);
 	die("Unrecoverable exception", regs, SIGABRT);
 }
-#endif /* CONFIG_PPC64 */
 
-#ifdef CONFIG_PPC32
 #ifdef CONFIG_BOOKE_WDT
 /*
  * Default handler for a Watchdog exception,
@@ -1230,9 +1109,7 @@ void WatchdogException(struct pt_regs *regs)
 	WatchdogHandler(regs);
 }
 #endif
-#endif /* CONFIG_PPC32 */
 
-#ifdef CONFIG_PPC64
 /*
  * We enter here if we discover during exception entry that we are
  * running in supervisor mode with a userspace value in the stack pointer.
@@ -1243,7 +1120,6 @@ void kernel_bad_stack(struct pt_regs *regs)
 	       regs->gpr[1], regs->nip);
 	die("Bad kernel stack pointer", regs, SIGABRT);
 }
-#endif
 
 void __init trap_init(void)
 {