path: root/arch/parisc/kernel/traps.c

/*
 *  linux/arch/parisc/traps.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *  Copyright (C) 1999, 2000  Philipp Rumpf <prumpf@tux.org>
 */

/*
 * 'Traps.c' handles hardware traps and faults after we have saved some
 * state in 'asm.s'.
 */

#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/console.h>
#include <linux/kallsyms.h>
#include <linux/bug.h>

#include <asm/assembly.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/unaligned.h>
#include <asm/atomic.h>
#include <asm/smp.h>
#include <asm/pdc.h>
#include <asm/pdc_chassis.h>
#include <asm/unwind.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>

#include "../math-emu/math-emu.h"	/* for handle_fpe() */

#define PRINT_USER_FAULTS /* (turn this on if you want user faults to be */
			  /*  dumped to the console via printk)          */

#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
DEFINE_SPINLOCK(pa_dbit_lock);
#endif

static int printbinary(char *buf, unsigned long x, int nbits)
{
	unsigned long mask = 1UL << (nbits - 1);
	while (mask != 0) {
		*buf++ = (mask & x ? '1' : '0');
		mask >>= 1;
	}
	*buf = '\0';

	return nbits;
}

#ifdef CONFIG_64BIT
#define RFMT "%016lx"
#else
#define RFMT "%08lx"
#endif
#define FFMT "%016llx"	/* fpregs are 64-bit always */

#define PRINTREGS(lvl,r,f,fmt,x)	\
	printk("%s%s%02d-%02d  " fmt " " fmt " " fmt " " fmt "\n",	\
		lvl, f, (x), (x+3), (r)[(x)+0], (r)[(x)+1],		\
		(r)[(x)+2], (r)[(x)+3])

static void print_gr(char *level, struct pt_regs *regs)
{
	int i;
	char buf[64];

	printk("%s\n", level);
	printk("%s     YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI\n", level);
	printbinary(buf, regs->gr[0], 32);
	printk("%sPSW: %s %s\n", level, buf, print_tainted());

	for (i = 0; i < 32; i += 4)
		PRINTREGS(level, regs->gr, "r", RFMT, i);
}

static void print_fr(char *level, struct pt_regs *regs)
{
	int i;
	char buf[64];
	struct { u32 sw[2]; } s;

	/* FR are 64bit everywhere. Need to use asm to get the content
	 * of fpsr/fper1, and we assume that we won't have a FP Identify
	 * in our way, otherwise we're screwed.
	 * The fldd is used to restore the T-bit if there was one, as the
	 * store clears it anyway.
	 * PA2.0 book says "thou shall not use fstw on FPSR/FPERs" - T-Bone */
	asm volatile ("fstd %%fr0,0(%1)	\n\t"
		      "fldd 0(%1),%%fr0	\n\t"
		      : "=m" (s) : "r" (&s) : "r0");

	printk("%s\n", level);
	printk("%s      VZOUICununcqcqcqcqcqcrmunTDVZOUI\n", level);
	printbinary(buf, s.sw[0], 32);
	printk("%sFPSR: %s\n", level, buf);
	printk("%sFPER1: %08x\n", level, s.sw[1]);

	/* here we'll print fr0 again, tho it'll be meaningless */
	for (i = 0; i < 32; i += 4)
		PRINTREGS(level, regs->fr, "fr", FFMT, i);
}

void show_regs(struct pt_regs *regs)
{
	int i;
	char *level;
	unsigned long cr30, cr31;

	level = user_mode(regs) ? KERN_DEBUG : KERN_CRIT;

	print_gr(level, regs);

	for (i = 0; i < 8; i += 4)
		PRINTREGS(level, regs->sr, "sr", RFMT, i);

	if (user_mode(regs))
		print_fr(level, regs);

	cr30 = mfctl(30);
	cr31 = mfctl(31);
	printk("%s\n", level);
	printk("%sIASQ: " RFMT " " RFMT " IAOQ: " RFMT " " RFMT "\n",
	       level, regs->iasq[0], regs->iasq[1], regs->iaoq[0], regs->iaoq[1]);
	printk("%s IIR: %08lx    ISR: " RFMT "  IOR: " RFMT "\n",
	       level, regs->iir, regs->isr, regs->ior);
	printk("%s CPU: %8d   CR30: " RFMT " CR31: " RFMT "\n",
	       level, current_thread_info()->cpu, cr30, cr31);
	printk("%s ORIG_R28: " RFMT "\n", level, regs->orig_r28);
	printk(level);
	print_symbol(" IAOQ[0]: %s\n", regs->iaoq[0]);
	printk(level);
	print_symbol(" IAOQ[1]: %s\n", regs->iaoq[1]);
	printk(level);
	print_symbol(" RP(r2): %s\n", regs->gr[2]);
}


void dump_stack(void)
{
	show_stack(NULL, NULL);
}

EXPORT_SYMBOL(dump_stack);

static void do_show_stack(struct unwind_frame_info *info)
{
	int i = 1;

	printk(KERN_CRIT "Backtrace:\n");
	while (i <= 16) {
		if (unwind_once(info) < 0 || info->ip == 0)
			break;