m68k: merge the mmu and non-mmu traps.c files

The code for handling traps in the non-mmu case is a subset of the mmu
enabled case. Merge the non-mmu traps_no.c code back to a single traps.c.
There is actually no code mmu specific here at all, and the processor
specific code (for the more complex 68020/68030/68040/68060) is already
proplerly conditionaly used.

The format of console exception dump is a little different, but I don't
think will cause any one problems, it is purely for debug purposes.

Signed-off-by: Greg Ungerer <[e-mail]>

arch/m68k/include/asm/processor.h

···
 	wrusp(_usp);                                    \
 } while(0)
 
+static inline  int handle_kernel_fault(struct pt_regs *regs)
+{
+	/* Any fault in kernel is fatal on non-mmu */
+	return 0;
+}
+
 #endif
 
 /* Forward declaration, a strange C thing */

arch/m68k/kernel/traps.c

···
-#ifdef CONFIG_MMU
-#include "traps_mm.c"
+/*
+ *  linux/arch/m68k/kernel/traps.c
+ *
+ *  Copyright (C) 1993, 1994 by Hamish Macdonald
+ *
+ *  68040 fixes by Michael Rausch
+ *  68040 fixes by Martin Apel
+ *  68040 fixes and writeback by Richard Zidlicky
+ *  68060 fixes by Roman Hodek
+ *  68060 fixes by Jesper Skov
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+/*
+ * Sets up all exception vectors
+ */
+
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/user.h>
+#include <linux/string.h>
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <linux/ptrace.h>
+#include <linux/kallsyms.h>
+
+#include <asm/setup.h>
+#include <asm/fpu.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/traps.h>
+#include <asm/pgalloc.h>
+#include <asm/machdep.h>
+#include <asm/siginfo.h>
+
+
+static const char *vec_names[] = {
+	[VEC_RESETSP]	= "RESET SP",
+	[VEC_RESETPC]	= "RESET PC",
+	[VEC_BUSERR]	= "BUS ERROR",
+	[VEC_ADDRERR]	= "ADDRESS ERROR",
+	[VEC_ILLEGAL]	= "ILLEGAL INSTRUCTION",
+	[VEC_ZERODIV]	= "ZERO DIVIDE",
+	[VEC_CHK]	= "CHK",
+	[VEC_TRAP]	= "TRAPcc",
+	[VEC_PRIV]	= "PRIVILEGE VIOLATION",
+	[VEC_TRACE]	= "TRACE",
+	[VEC_LINE10]	= "LINE 1010",
+	[VEC_LINE11]	= "LINE 1111",
+	[VEC_RESV12]	= "UNASSIGNED RESERVED 12",
+	[VEC_COPROC]	= "COPROCESSOR PROTOCOL VIOLATION",
+	[VEC_FORMAT]	= "FORMAT ERROR",
+	[VEC_UNINT]	= "UNINITIALIZED INTERRUPT",
+	[VEC_RESV16]	= "UNASSIGNED RESERVED 16",
+	[VEC_RESV17]	= "UNASSIGNED RESERVED 17",
+	[VEC_RESV18]	= "UNASSIGNED RESERVED 18",
+	[VEC_RESV19]	= "UNASSIGNED RESERVED 19",
+	[VEC_RESV20]	= "UNASSIGNED RESERVED 20",
+	[VEC_RESV21]	= "UNASSIGNED RESERVED 21",
+	[VEC_RESV22]	= "UNASSIGNED RESERVED 22",
+	[VEC_RESV23]	= "UNASSIGNED RESERVED 23",
+	[VEC_SPUR]	= "SPURIOUS INTERRUPT",
+	[VEC_INT1]	= "LEVEL 1 INT",
+	[VEC_INT2]	= "LEVEL 2 INT",
+	[VEC_INT3]	= "LEVEL 3 INT",
+	[VEC_INT4]	= "LEVEL 4 INT",
+	[VEC_INT5]	= "LEVEL 5 INT",
+	[VEC_INT6]	= "LEVEL 6 INT",
+	[VEC_INT7]	= "LEVEL 7 INT",
+	[VEC_SYS]	= "SYSCALL",
+	[VEC_TRAP1]	= "TRAP #1",
+	[VEC_TRAP2]	= "TRAP #2",
+	[VEC_TRAP3]	= "TRAP #3",
+	[VEC_TRAP4]	= "TRAP #4",
+	[VEC_TRAP5]	= "TRAP #5",
+	[VEC_TRAP6]	= "TRAP #6",
+	[VEC_TRAP7]	= "TRAP #7",
+	[VEC_TRAP8]	= "TRAP #8",
+	[VEC_TRAP9]	= "TRAP #9",
+	[VEC_TRAP10]	= "TRAP #10",
+	[VEC_TRAP11]	= "TRAP #11",
+	[VEC_TRAP12]	= "TRAP #12",
+	[VEC_TRAP13]	= "TRAP #13",
+	[VEC_TRAP14]	= "TRAP #14",
+	[VEC_TRAP15]	= "TRAP #15",
+	[VEC_FPBRUC]	= "FPCP BSUN",
+	[VEC_FPIR]	= "FPCP INEXACT",
+	[VEC_FPDIVZ]	= "FPCP DIV BY 0",
+	[VEC_FPUNDER]	= "FPCP UNDERFLOW",
+	[VEC_FPOE]	= "FPCP OPERAND ERROR",
+	[VEC_FPOVER]	= "FPCP OVERFLOW",
+	[VEC_FPNAN]	= "FPCP SNAN",
+	[VEC_FPUNSUP]	= "FPCP UNSUPPORTED OPERATION",
+	[VEC_MMUCFG]	= "MMU CONFIGURATION ERROR",
+	[VEC_MMUILL]	= "MMU ILLEGAL OPERATION ERROR",
+	[VEC_MMUACC]	= "MMU ACCESS LEVEL VIOLATION ERROR",
+	[VEC_RESV59]	= "UNASSIGNED RESERVED 59",
+	[VEC_UNIMPEA]	= "UNASSIGNED RESERVED 60",
+	[VEC_UNIMPII]	= "UNASSIGNED RESERVED 61",
+	[VEC_RESV62]	= "UNASSIGNED RESERVED 62",
+	[VEC_RESV63]	= "UNASSIGNED RESERVED 63",
+};
+
+static const char *space_names[] = {
+	[0]		= "Space 0",
+	[USER_DATA]	= "User Data",
+	[USER_PROGRAM]	= "User Program",
+#ifndef CONFIG_SUN3
+	[3]		= "Space 3",
 #else
-#include "traps_no.c"
+	[FC_CONTROL]	= "Control",
+#endif
+	[4]		= "Space 4",
+	[SUPER_DATA]	= "Super Data",
+	[SUPER_PROGRAM]	= "Super Program",
+	[CPU_SPACE]	= "CPU"
+};
+
+void die_if_kernel(char *,struct pt_regs *,int);
+asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
+                             unsigned long error_code);
+int send_fault_sig(struct pt_regs *regs);
+
+asmlinkage void trap_c(struct frame *fp);
+
+#if defined (CONFIG_M68060)
+static inline void access_error060 (struct frame *fp)
+{
+	unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
+
+#ifdef DEBUG
+	printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
+#endif
+
+	if (fslw & MMU060_BPE) {
+		/* branch prediction error -> clear branch cache */
+		__asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
+				      "orl   #0x00400000,%/d0\n\t"
+				      "movec %/d0,%/cacr"
+				      : : : "d0" );
+		/* return if there's no other error */
+		if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
+			return;
+	}
+
+	if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
+		unsigned long errorcode;
+		unsigned long addr = fp->un.fmt4.effaddr;
+
+		if (fslw & MMU060_MA)
+			addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
+
+		errorcode = 1;
+		if (fslw & MMU060_DESC_ERR) {
+			__flush_tlb040_one(addr);
+			errorcode = 0;
+		}
+		if (fslw & MMU060_W)
+			errorcode |= 2;
+#ifdef DEBUG
+		printk("errorcode = %d\n", errorcode );
+#endif
+		do_page_fault(&fp->ptregs, addr, errorcode);
+	} else if (fslw & (MMU060_SEE)){
+		/* Software Emulation Error.
+		 * fault during mem_read/mem_write in ifpsp060/os.S
+		 */
+		send_fault_sig(&fp->ptregs);
+	} else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
+		   send_fault_sig(&fp->ptregs) > 0) {
+		printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
+		printk( "68060 access error, fslw=%lx\n", fslw );
+		trap_c( fp );
+	}
+}
+#endif /* CONFIG_M68060 */
+
+#if defined (CONFIG_M68040)
+static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
+{
+	unsigned long mmusr;
+	mm_segment_t old_fs = get_fs();
+
+	set_fs(MAKE_MM_SEG(wbs));
+
+	if (iswrite)
+		asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
+	else
+		asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
+
+	asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
+
+	set_fs(old_fs);
+
+	return mmusr;
+}
+
+static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
+				   unsigned long wbd)
+{
+	int res = 0;
+	mm_segment_t old_fs = get_fs();
+
+	/* set_fs can not be moved, otherwise put_user() may oops */
+	set_fs(MAKE_MM_SEG(wbs));
+
+	switch (wbs & WBSIZ_040) {
+	case BA_SIZE_BYTE:
+		res = put_user(wbd & 0xff, (char __user *)wba);
+		break;
+	case BA_SIZE_WORD:
+		res = put_user(wbd & 0xffff, (short __user *)wba);
+		break;
+	case BA_SIZE_LONG:
+		res = put_user(wbd, (int __user *)wba);
+		break;
+	}
+
+	/* set_fs can not be moved, otherwise put_user() may oops */
+	set_fs(old_fs);
+
+
+#ifdef DEBUG
+	printk("do_040writeback1, res=%d\n",res);
+#endif
+
+	return res;
+}
+
+/* after an exception in a writeback the stack frame corresponding
+ * to that exception is discarded, set a few bits in the old frame
+ * to simulate what it should look like
+ */
+static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
+{
+	fp->un.fmt7.faddr = wba;
+	fp->un.fmt7.ssw = wbs & 0xff;
+	if (wba != current->thread.faddr)
+	    fp->un.fmt7.ssw |= MA_040;
+}
+
+static inline void do_040writebacks(struct frame *fp)
+{
+	int res = 0;
+#if 0
+	if (fp->un.fmt7.wb1s & WBV_040)
+		printk("access_error040: cannot handle 1st writeback. oops.\n");
+#endif
+
+	if ((fp->un.fmt7.wb2s & WBV_040) &&
+	    !(fp->un.fmt7.wb2s & WBTT_040)) {
+		res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
+				       fp->un.fmt7.wb2d);
+		if (res)
+			fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
+		else
+			fp->un.fmt7.wb2s = 0;
+	}
+
+	/* do the 2nd wb only if the first one was successful (except for a kernel wb) */
+	if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
+		res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
+				       fp->un.fmt7.wb3d);
+		if (res)
+		    {
+			fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
+
+			fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
+			fp->un.fmt7.wb3s &= (~WBV_040);
+			fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
+			fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
+		    }
+		else
+			fp->un.fmt7.wb3s = 0;
+	}
+
+	if (res)
+		send_fault_sig(&fp->ptregs);
+}
+
+/*
+ * called from sigreturn(), must ensure userspace code didn't
+ * manipulate exception frame to circumvent protection, then complete
+ * pending writebacks
+ * we just clear TM2 to turn it into a userspace access
+ */
+asmlinkage void berr_040cleanup(struct frame *fp)
+{
+	fp->un.fmt7.wb2s &= ~4;
+	fp->un.fmt7.wb3s &= ~4;
+
+	do_040writebacks(fp);
+}
+
+static inline void access_error040(struct frame *fp)
+{
+	unsigned short ssw = fp->un.fmt7.ssw;
+	unsigned long mmusr;
+
+#ifdef DEBUG
+	printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
+        printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
+		fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
+	printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
+		fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
+		fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
+#endif
+
+	if (ssw & ATC_040) {
+		unsigned long addr = fp->un.fmt7.faddr;
+		unsigned long errorcode;
+
+		/*
+		 * The MMU status has to be determined AFTER the address
+		 * has been corrected if there was a misaligned access (MA).
+		 */
+		if (ssw & MA_040)
+			addr = (addr + 7) & -8;
+
+		/* MMU error, get the MMUSR info for this access */
+		mmusr = probe040(!(ssw & RW_040), addr, ssw);
+#ifdef DEBUG
+		printk("mmusr = %lx\n", mmusr);
+#endif
+		errorcode = 1;
+		if (!(mmusr & MMU_R_040)) {
+			/* clear the invalid atc entry */
+			__flush_tlb040_one(addr);
+			errorcode = 0;
+		}
+
+		/* despite what documentation seems to say, RMW
+		 * accesses have always both the LK and RW bits set */
+		if (!(ssw & RW_040) || (ssw & LK_040))
+			errorcode |= 2;
+
+		if (do_page_fault(&fp->ptregs, addr, errorcode)) {
+#ifdef DEBUG
+			printk("do_page_fault() !=0\n");
+#endif
+			if (user_mode(&fp->ptregs)){
+				/* delay writebacks after signal delivery */
+#ifdef DEBUG
+			        printk(".. was usermode - return\n");
+#endif
+				return;
+			}
+			/* disable writeback into user space from kernel
+			 * (if do_page_fault didn't fix the mapping,
+                         * the writeback won't do good)
+			 */
+disable_wb:
+#ifdef DEBUG
+			printk(".. disabling wb2\n");
+#endif
+			if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
+				fp->un.fmt7.wb2s &= ~WBV_040;
+			if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
+				fp->un.fmt7.wb3s &= ~WBV_040;
+		}
+	} else {
+		/* In case of a bus error we either kill the process or expect
+		 * the kernel to catch the fault, which then is also responsible
+		 * for cleaning up the mess.
+		 */
+		current->thread.signo = SIGBUS;
+		current->thread.faddr = fp->un.fmt7.faddr;
+		if (send_fault_sig(&fp->ptregs) >= 0)
+			printk("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
+			       fp->un.fmt7.faddr);
+		goto disable_wb;
+	}
+
+	do_040writebacks(fp);
+}
+#endif /* CONFIG_M68040 */
+
+#if defined(CONFIG_SUN3)
+#include <asm/sun3mmu.h>
+
+extern int mmu_emu_handle_fault (unsigned long, int, int);
+
+/* sun3 version of bus_error030 */
+
+static inline void bus_error030 (struct frame *fp)
+{
+	unsigned char buserr_type = sun3_get_buserr ();
+	unsigned long addr, errorcode;
+	unsigned short ssw = fp->un.fmtb.ssw;
+	extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
+
+#ifdef DEBUG
+	if (ssw & (FC | FB))
+		printk ("Instruction fault at %#010lx\n",
+			ssw & FC ?
+			fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
+			:
+			fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
+	if (ssw & DF)
+		printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
+			ssw & RW ? "read" : "write",
+			fp->un.fmtb.daddr,
+			space_names[ssw & DFC], fp->ptregs.pc);
+#endif
+
+	/*
+	 * Check if this page should be demand-mapped. This needs to go before
+	 * the testing for a bad kernel-space access (demand-mapping applies
+	 * to kernel accesses too).
+	 */
+
+	if ((ssw & DF)
+	    && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
+		if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
+			return;
+	}
+
+	/* Check for kernel-space pagefault (BAD). */
+	if (fp->ptregs.sr & PS_S) {
+		/* kernel fault must be a data fault to user space */
+		if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
+		     // try checking the kernel mappings before surrender
+		     if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
+			  return;
+			/* instruction fault or kernel data fault! */
+			if (ssw & (FC | FB))
+				printk ("Instruction fault at %#010lx\n",
+					fp->ptregs.pc);
+			if (ssw & DF) {
+				/* was this fault incurred testing bus mappings? */
+				if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
+				   (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
+					send_fault_sig(&fp->ptregs);
+					return;
+				}
+
+				printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
+					ssw & RW ? "read" : "write",
+					fp->un.fmtb.daddr,
+					space_names[ssw & DFC], fp->ptregs.pc);
+			}
+			printk ("BAD KERNEL BUSERR\n");
+
+			die_if_kernel("Oops", &fp->ptregs,0);
+			force_sig(SIGKILL, current);
+			return;
+		}
+	} else {
+		/* user fault */
+		if (!(ssw & (FC | FB)) && !(ssw & DF))
+			/* not an instruction fault or data fault! BAD */
+			panic ("USER BUSERR w/o instruction or data fault");
+	}
+
+
+	/* First handle the data fault, if any.  */
+	if (ssw & DF) {
+		addr = fp->un.fmtb.daddr;
+
+// errorcode bit 0:	0 -> no page		1 -> protection fault
+// errorcode bit 1:	0 -> read fault		1 -> write fault
+
+// (buserr_type & SUN3_BUSERR_PROTERR)	-> protection fault
+// (buserr_type & SUN3_BUSERR_INVALID)	-> invalid page fault
+
+		if (buserr_type & SUN3_BUSERR_PROTERR)
+			errorcode = 0x01;
+		else if (buserr_type & SUN3_BUSERR_INVALID)
+			errorcode = 0x00;
+		else {
+#ifdef DEBUG
+			printk ("*** unexpected busfault type=%#04x\n", buserr_type);
+			printk ("invalid %s access at %#lx from pc %#lx\n",
+				!(ssw & RW) ? "write" : "read", addr,
+				fp->ptregs.pc);
+#endif
+			die_if_kernel ("Oops", &fp->ptregs, buserr_type);
+			force_sig (SIGBUS, current);
+			return;
+		}
+
+//todo: wtf is RM bit? --m
+		if (!(ssw & RW) || ssw & RM)
+			errorcode |= 0x02;
+
+		/* Handle page fault. */
+		do_page_fault (&fp->ptregs, addr, errorcode);
+
+		/* Retry the data fault now. */
+		return;
+	}
+
+	/* Now handle the instruction fault. */
+
+	/* Get the fault address. */
+	if (fp->ptregs.format == 0xA)
+		addr = fp->ptregs.pc + 4;
+	else
+		addr = fp->un.fmtb.baddr;
+	if (ssw & FC)
+		addr -= 2;
+
+	if (buserr_type & SUN3_BUSERR_INVALID) {
+		if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
+			do_page_fault (&fp->ptregs, addr, 0);
+       } else {
+#ifdef DEBUG
+		printk ("protection fault on insn access (segv).\n");
+#endif
+		force_sig (SIGSEGV, current);
+       }
+}
+#else
+#if defined(CPU_M68020_OR_M68030)
+static inline void bus_error030 (struct frame *fp)
+{
+	volatile unsigned short temp;
+	unsigned short mmusr;
+	unsigned long addr, errorcode;
+	unsigned short ssw = fp->un.fmtb.ssw;
+#ifdef DEBUG
+	unsigned long desc;
+
+	printk ("pid = %x  ", current->pid);
+	printk ("SSW=%#06x  ", ssw);
+
+	if (ssw & (FC | FB))
+		printk ("Instruction fault at %#010lx\n",
+			ssw & FC ?
+			fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
+			:
+			fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
+	if (ssw & DF)
+		printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
+			ssw & RW ? "read" : "write",
+			fp->un.fmtb.daddr,
+			space_names[ssw & DFC], fp->ptregs.pc);
+#endif
+
+	/* ++andreas: If a data fault and an instruction fault happen
+	   at the same time map in both pages.  */
+
+	/* First handle the data fault, if any.  */
+	if (ssw & DF) {
+		addr = fp->un.fmtb.daddr;
+
+#ifdef DEBUG
+		asm volatile ("ptestr %3,%2@,#7,%0\n\t"
+			      "pmove %%psr,%1@"
+			      : "=a&" (desc)
+			      : "a" (&temp), "a" (addr), "d" (ssw));
+#else
+		asm volatile ("ptestr %2,%1@,#7\n\t"
+			      "pmove %%psr,%0@"
+			      : : "a" (&temp), "a" (addr), "d" (ssw));
+#endif
+		mmusr = temp;
+
+#ifdef DEBUG
+		printk("mmusr is %#x for addr %#lx in task %p\n",
+		       mmusr, addr, current);
+		printk("descriptor address is %#lx, contents %#lx\n",
+		       __va(desc), *(unsigned long *)__va(desc));
+#endif
+
+		errorcode = (mmusr & MMU_I) ? 0 : 1;
+		if (!(ssw & RW) || (ssw & RM))
+			errorcode |= 2;
+
+		if (mmusr & (MMU_I | MMU_WP)) {
+			if (ssw & 4) {
+				printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
+				       ssw & RW ? "read" : "write",
+				       fp->un.fmtb.daddr,
+				       space_names[ssw & DFC], fp->ptregs.pc);
+				goto buserr;
+			}
+			/* Don't try to do anything further if an exception was
+			   handled. */
+			if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
+				return;
+		} else if (!(mmusr & MMU_I)) {
+			/* probably a 020 cas fault */
+			if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
+				printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
+		} else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
+			printk("invalid %s access at %#lx from pc %#lx\n",
+			       !(ssw & RW) ? "write" : "read", addr,
+			       fp->ptregs.pc);
+			die_if_kernel("Oops",&fp->ptregs,mmusr);
+			force_sig(SIGSEGV, current);
+			return;
+		} else {
+#if 0
+			static volatile long tlong;
+#endif
+
+			printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
+			       !(ssw & RW) ? "write" : "read", addr,
+			       fp->ptregs.pc, ssw);
+			asm volatile ("ptestr #1,%1@,#0\n\t"
+				      "pmove %%psr,%0@"
+				      : /* no outputs */
+				      : "a" (&temp), "a" (addr));
+			mmusr = temp;
+
+			printk ("level 0 mmusr is %#x\n", mmusr);
+#if 0
+			asm volatile ("pmove %%tt0,%0@"
+				      : /* no outputs */
+				      : "a" (&tlong));
+			printk("tt0 is %#lx, ", tlong);
+			asm volatile ("pmove %%tt1,%0@"
+				      : /* no outputs */
+				      : "a" (&tlong));
+			printk("tt1 is %#lx\n", tlong);
+#endif
+#ifdef DEBUG
+			printk("Unknown SIGSEGV - 1\n");
+#endif
+			die_if_kernel("Oops",&fp->ptregs,mmusr);
+			force_sig(SIGSEGV, current);
+			return;
+		}
+
+		/* setup an ATC entry for the access about to be retried */
+		if (!(ssw & RW) || (ssw & RM))
+			asm volatile ("ploadw %1,%0@" : /* no outputs */
+				      : "a" (addr), "d" (ssw));
+		else
+			asm volatile ("ploadr %1,%0@" : /* no outputs */
+				      : "a" (addr), "d" (ssw));
+	}
+
+	/* Now handle the instruction fault. */
+
+	if (!(ssw & (FC|FB)))
+		return;
+
+	if (fp->ptregs.sr & PS_S) {
+		printk("Instruction fault at %#010lx\n",
+			fp->ptregs.pc);
+	buserr:
+		printk ("BAD KERNEL BUSERR\n");
+		die_if_kernel("Oops",&fp->ptregs,0);
+		force_sig(SIGKILL, current);
+		return;
+	}
+
+	/* get the fault address */
+	if (fp->ptregs.format == 10)
+		addr = fp->ptregs.pc + 4;
+	else
+		addr = fp->un.fmtb.baddr;
+	if (ssw & FC)
+		addr -= 2;
+
+	if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
+		/* Insn fault on same page as data fault.  But we
+		   should still create the ATC entry.  */
+		goto create_atc_entry;
+
+#ifdef DEBUG
+	asm volatile ("ptestr #1,%2@,#7,%0\n\t"
+		      "pmove %%psr,%1@"
+		      : "=a&" (desc)
+		      : "a" (&temp), "a" (addr));
+#else
+	asm volatile ("ptestr #1,%1@,#7\n\t"
+		      "pmove %%psr,%0@"
+		      : : "a" (&temp), "a" (addr));
+#endif
+	mmusr = temp;
+
+#ifdef DEBUG
+	printk ("mmusr is %#x for addr %#lx in task %p\n",
+		mmusr, addr, current);
+	printk ("descriptor address is %#lx, contents %#lx\n",
+		__va(desc), *(unsigned long *)__va(desc));
+#endif
+
+	if (mmusr & MMU_I)
+		do_page_fault (&fp->ptregs, addr, 0);
+	else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
+		printk ("invalid insn access at %#lx from pc %#lx\n",
+			addr, fp->ptregs.pc);
+#ifdef DEBUG
+		printk("Unknown SIGSEGV - 2\n");
+#endif
+		die_if_kernel("Oops",&fp->ptregs,mmusr);
+		force_sig(SIGSEGV, current);
+		return;
+	}
+
+create_atc_entry:
+	/* setup an ATC entry for the access about to be retried */
+	asm volatile ("ploadr #2,%0@" : /* no outputs */
+		      : "a" (addr));
+}
+#endif /* CPU_M68020_OR_M68030 */
+#endif /* !CONFIG_SUN3 */
+
+asmlinkage void buserr_c(struct frame *fp)
+{
+	/* Only set esp0 if coming from user mode */
+	if (user_mode(&fp->ptregs))
+		current->thread.esp0 = (unsigned long) fp;
+
+#ifdef DEBUG
+	printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
+#endif
+
+	switch (fp->ptregs.format) {
+#if defined (CONFIG_M68060)
+	case 4:				/* 68060 access error */
+	  access_error060 (fp);
+	  break;
+#endif
+#if defined (CONFIG_M68040)
+	case 0x7:			/* 68040 access error */
+	  access_error040 (fp);
+	  break;
+#endif
+#if defined (CPU_M68020_OR_M68030)
+	case 0xa:
+	case 0xb:
+	  bus_error030 (fp);
+	  break;
+#endif
+	default:
+	  die_if_kernel("bad frame format",&fp->ptregs,0);
+#ifdef DEBUG
+	  printk("Unknown SIGSEGV - 4\n");
+#endif
+	  force_sig(SIGSEGV, current);
+	}
+}
+
+
+static int kstack_depth_to_print = 48;
+
+void show_trace(unsigned long *stack)
+{
+	unsigned long *endstack;
+	unsigned long addr;
+	int i;
+
+	printk("Call Trace:");
+	addr = (unsigned long)stack + THREAD_SIZE - 1;
+	endstack = (unsigned long *)(addr & -THREAD_SIZE);
+	i = 0;
+	while (stack + 1 <= endstack) {
+		addr = *stack++;
+		/*
+		 * If the address is either in the text segment of the
+		 * kernel, or in the region which contains vmalloc'ed
+		 * memory, it *may* be the address of a calling
+		 * routine; if so, print it so that someone tracing
+		 * down the cause of the crash will be able to figure
+		 * out the call path that was taken.
+		 */
+		if (__kernel_text_address(addr)) {
+#ifndef CONFIG_KALLSYMS
+			if (i % 5 == 0)
+				printk("\n       ");
+#endif
+			printk(" [<%08lx>] %pS\n", addr, (void *)addr);
+			i++;
+		}
+	}
+	printk("\n");
+}
+
+void show_registers(struct pt_regs *regs)
+{
+	struct frame *fp = (struct frame *)regs;
+	mm_segment_t old_fs = get_fs();
+	u16 c, *cp;
+	unsigned long addr;
+	int i;
+
+	print_modules();
+	printk("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc);
+	printk("SR: %04x  SP: %p  a2: %08lx\n", regs->sr, regs, regs->a2);
+	printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
+	       regs->d0, regs->d1, regs->d2, regs->d3);
+	printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
+	       regs->d4, regs->d5, regs->a0, regs->a1);
+
+	printk("Process %s (pid: %d, task=%p)\n",
+		current->comm, task_pid_nr(current), current);
+	addr = (unsigned long)&fp->un;
+	printk("Frame format=%X ", regs->format);
+	switch (regs->format) {
+	case 0x2:
+		printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
+		addr += sizeof(fp->un.fmt2);
+		break;
+	case 0x3:
+		printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
+		addr += sizeof(fp->un.fmt3);
+		break;
+	case 0x4:
+		printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
+			: "eff addr=%08lx pc=%08lx\n"),
+			fp->un.fmt4.effaddr, fp->un.fmt4.pc);
+		addr += sizeof(fp->un.fmt4);
+		break;
+	case 0x7:
+		printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
+			fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
+		printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
+			fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
+		printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
+			fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
+		printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
+			fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
+		printk("push data: %08lx %08lx %08lx %08lx\n",
+			fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
+			fp->un.fmt7.pd3);
+		addr += sizeof(fp->un.fmt7);
+		break;
+	case 0x9:
+		printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
+		addr += sizeof(fp->un.fmt9);
+		break;
+	case 0xa:
+		printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
+			fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
+			fp->un.fmta.daddr, fp->un.fmta.dobuf);
+		addr += sizeof(fp->un.fmta);
+		break;
+	case 0xb:
+		printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
+			fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
+			fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
+		printk("baddr=%08lx dibuf=%08lx ver=%x\n",
+			fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
+		addr += sizeof(fp->un.fmtb);
+		break;
+	default:
+		printk("\n");
+	}
+	show_stack(NULL, (unsigned long *)addr);
+
+	printk("Code:");
+	set_fs(KERNEL_DS);
+	cp = (u16 *)regs->pc;
+	for (i = -8; i < 16; i++) {
+		if (get_user(c, cp + i) && i >= 0) {
+			printk(" Bad PC value.");
+			break;
+		}
+		printk(i ? " %04x" : " <%04x>", c);
+	}
+	set_fs(old_fs);
+	printk ("\n");
+}
+
+void show_stack(struct task_struct *task, unsigned long *stack)
+{
+	unsigned long *p;
+	unsigned long *endstack;
+	int i;
+
+	if (!stack) {
+		if (task)
+			stack = (unsigned long *)task->thread.esp0;
+		else
+			stack = (unsigned long *)&stack;
+	}
+	endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
+
+	printk("Stack from %08lx:", (unsigned long)stack);
+	p = stack;
+	for (i = 0; i < kstack_depth_to_print; i++) {
+		if (p + 1 > endstack)
+			break;
+		if (i % 8 == 0)
+			printk("\n       ");
+		printk(" %08lx", *p++);
+	}
+	printk("\n");
+	show_trace(stack);
+}
+
+/*
+ * The architecture-independent backtrace generator
+ */
+void dump_stack(void)
+{
+	unsigned long stack;
+
+	show_trace(&stack);
+}
+
+EXPORT_SYMBOL(dump_stack);
+
+/*
+ * The vector number returned in the frame pointer may also contain
+ * the "fs" (Fault Status) bits on ColdFire. These are in the bottom
+ * 2 bits, and upper 2 bits. So we need to mask out the real vector
+ * number before using it in comparisons. You don't need to do this on
+ * real 68k parts, but it won't hurt either.
+ */
+
+void bad_super_trap (struct frame *fp)
+{
+	int vector = (fp->ptregs.vector >> 2) & 0xff;
+
+	console_verbose();
+	if (vector < ARRAY_SIZE(vec_names))
+		printk ("*** %s ***   FORMAT=%X\n",
+			vec_names[vector],
+			fp->ptregs.format);
+	else
+		printk ("*** Exception %d ***   FORMAT=%X\n",
+			vector, fp->ptregs.format);
+	if (vector == VEC_ADDRERR && CPU_IS_020_OR_030) {
+		unsigned short ssw = fp->un.fmtb.ssw;
+
+		printk ("SSW=%#06x  ", ssw);
+
+		if (ssw & RC)
+			printk ("Pipe stage C instruction fault at %#010lx\n",
+				(fp->ptregs.format) == 0xA ?
+				fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
+		if (ssw & RB)
+			printk ("Pipe stage B instruction fault at %#010lx\n",
+				(fp->ptregs.format) == 0xA ?
+				fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
+		if (ssw & DF)
+			printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
+				ssw & RW ? "read" : "write",
+				fp->un.fmtb.daddr, space_names[ssw & DFC],
+				fp->ptregs.pc);
+	}
+	printk ("Current process id is %d\n", task_pid_nr(current));
+	die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
+}
+
+asmlinkage void trap_c(struct frame *fp)
+{
+	int sig;
+	int vector = (fp->ptregs.vector >> 2) & 0xff;
+	siginfo_t info;
+
+	if (fp->ptregs.sr & PS_S) {
+		if (vector == VEC_TRACE) {
+			/* traced a trapping instruction on a 68020/30,
+			 * real exception will be executed afterwards.
+			 */
+		} else if (!handle_kernel_fault(&fp->ptregs))
+			bad_super_trap(fp);
+		return;
+	}
+
+	/* send the appropriate signal to the user program */
+	switch (vector) {
+	    case VEC_ADDRERR:
+		info.si_code = BUS_ADRALN;
+		sig = SIGBUS;
+		break;
+	    case VEC_ILLEGAL:
+	    case VEC_LINE10:
+	    case VEC_LINE11:
+		info.si_code = ILL_ILLOPC;
+		sig = SIGILL;
+		break;
+	    case VEC_PRIV:
+		info.si_code = ILL_PRVOPC;
+		sig = SIGILL;
+		break;
+	    case VEC_COPROC:
+		info.si_code = ILL_COPROC;
+		sig = SIGILL;
+		break;
+	    case VEC_TRAP1:
+	    case VEC_TRAP2:
+	    case VEC_TRAP3:
+	    case VEC_TRAP4:
+	    case VEC_TRAP5:
+	    case VEC_TRAP6:
+	    case VEC_TRAP7:
+	    case VEC_TRAP8:
+	    case VEC_TRAP9:
+	    case VEC_TRAP10:
+	    case VEC_TRAP11:
+	    case VEC_TRAP12:
+	    case VEC_TRAP13:
+	    case VEC_TRAP14:
+		info.si_code = ILL_ILLTRP;
+		sig = SIGILL;
+		break;
+	    case VEC_FPBRUC:
+	    case VEC_FPOE:
+	    case VEC_FPNAN:
+		info.si_code = FPE_FLTINV;
+		sig = SIGFPE;
+		break;
+	    case VEC_FPIR:
+		info.si_code = FPE_FLTRES;
+		sig = SIGFPE;
+		break;
+	    case VEC_FPDIVZ:
+		info.si_code = FPE_FLTDIV;
+		sig = SIGFPE;
+		break;
+	    case VEC_FPUNDER:
+		info.si_code = FPE_FLTUND;
+		sig = SIGFPE;
+		break;
+	    case VEC_FPOVER:
+		info.si_code = FPE_FLTOVF;
+		sig = SIGFPE;
+		break;
+	    case VEC_ZERODIV:
+		info.si_code = FPE_INTDIV;
+		sig = SIGFPE;
+		break;
+	    case VEC_CHK:
+	    case VEC_TRAP:
+		info.si_code = FPE_INTOVF;
+		sig = SIGFPE;
+		break;
+	    case VEC_TRACE:		/* ptrace single step */
+		info.si_code = TRAP_TRACE;
+		sig = SIGTRAP;
+		break;
+	    case VEC_TRAP15:		/* breakpoint */
+		info.si_code = TRAP_BRKPT;
+		sig = SIGTRAP;
+		break;
+	    default:
+		info.si_code = ILL_ILLOPC;
+		sig = SIGILL;
+		break;
+	}
+	info.si_signo = sig;
+	info.si_errno = 0;
+	switch (fp->ptregs.format) {
+	    default:
+		info.si_addr = (void *) fp->ptregs.pc;
+		break;
+	    case 2:
+		info.si_addr = (void *) fp->un.fmt2.iaddr;
+		break;
+	    case 7:
+		info.si_addr = (void *) fp->un.fmt7.effaddr;
+		break;
+	    case 9:
+		info.si_addr = (void *) fp->un.fmt9.iaddr;
+		break;
+	    case 10:
+		info.si_addr = (void *) fp->un.fmta.daddr;
+		break;
+	    case 11:
+		info.si_addr = (void *) fp->un.fmtb.daddr;
+		break;
+	}
+	force_sig_info (sig, &info, current);
+}
+
+void die_if_kernel (char *str, struct pt_regs *fp, int nr)
+{
+	if (!(fp->sr & PS_S))
+		return;
+
+	console_verbose();
+	printk("%s: %08x\n",str,nr);
+	show_registers(fp);
+	add_taint(TAINT_DIE);
+	do_exit(SIGSEGV);
+}
+
+asmlinkage void set_esp0(unsigned long ssp)
+{
+	current->thread.esp0 = ssp;
+}
+
+/*
+ * This function is called if an error occur while accessing
+ * user-space from the fpsp040 code.
+ */
+asmlinkage void fpsp040_die(void)
+{
+	do_exit(SIGSEGV);
+}
+
+#ifdef CONFIG_M68KFPU_EMU
+asmlinkage void fpemu_signal(int signal, int code, void *addr)
+{
+	siginfo_t info;
+
+	info.si_signo = signal;
+	info.si_errno = 0;
+	info.si_code = code;
+	info.si_addr = addr;
+	force_sig_info(signal, &info, current);
+}
 #endif

arch/m68k/kernel/traps_mm.c

···
-/*
- *  linux/arch/m68k/kernel/traps.c
- *
- *  Copyright (C) 1993, 1994 by Hamish Macdonald
- *
- *  68040 fixes by Michael Rausch
- *  68040 fixes by Martin Apel
- *  68040 fixes and writeback by Richard Zidlicky
- *  68060 fixes by Roman Hodek
- *  68060 fixes by Jesper Skov
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file COPYING in the main directory of this archive
- * for more details.
- */
-
-/*
- * Sets up all exception vectors
- */
-
-#include <linux/sched.h>
-#include <linux/signal.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/user.h>
-#include <linux/string.h>
-#include <linux/linkage.h>
-#include <linux/init.h>
-#include <linux/ptrace.h>
-#include <linux/kallsyms.h>
-
-#include <asm/setup.h>
-#include <asm/fpu.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <asm/traps.h>
-#include <asm/pgalloc.h>
-#include <asm/machdep.h>
-#include <asm/siginfo.h>
-
-
-static const char *vec_names[] = {
-	[VEC_RESETSP]	= "RESET SP",
-	[VEC_RESETPC]	= "RESET PC",
-	[VEC_BUSERR]	= "BUS ERROR",
-	[VEC_ADDRERR]	= "ADDRESS ERROR",
-	[VEC_ILLEGAL]	= "ILLEGAL INSTRUCTION",
-	[VEC_ZERODIV]	= "ZERO DIVIDE",
-	[VEC_CHK]	= "CHK",
-	[VEC_TRAP]	= "TRAPcc",
-	[VEC_PRIV]	= "PRIVILEGE VIOLATION",
-	[VEC_TRACE]	= "TRACE",
-	[VEC_LINE10]	= "LINE 1010",
-	[VEC_LINE11]	= "LINE 1111",
-	[VEC_RESV12]	= "UNASSIGNED RESERVED 12",
-	[VEC_COPROC]	= "COPROCESSOR PROTOCOL VIOLATION",
-	[VEC_FORMAT]	= "FORMAT ERROR",
-	[VEC_UNINT]	= "UNINITIALIZED INTERRUPT",
-	[VEC_RESV16]	= "UNASSIGNED RESERVED 16",
-	[VEC_RESV17]	= "UNASSIGNED RESERVED 17",
-	[VEC_RESV18]	= "UNASSIGNED RESERVED 18",
-	[VEC_RESV19]	= "UNASSIGNED RESERVED 19",
-	[VEC_RESV20]	= "UNASSIGNED RESERVED 20",
-	[VEC_RESV21]	= "UNASSIGNED RESERVED 21",
-	[VEC_RESV22]	= "UNASSIGNED RESERVED 22",
-	[VEC_RESV23]	= "UNASSIGNED RESERVED 23",
-	[VEC_SPUR]	= "SPURIOUS INTERRUPT",
-	[VEC_INT1]	= "LEVEL 1 INT",
-	[VEC_INT2]	= "LEVEL 2 INT",
-	[VEC_INT3]	= "LEVEL 3 INT",
-	[VEC_INT4]	= "LEVEL 4 INT",
-	[VEC_INT5]	= "LEVEL 5 INT",
-	[VEC_INT6]	= "LEVEL 6 INT",
-	[VEC_INT7]	= "LEVEL 7 INT",
-	[VEC_SYS]	= "SYSCALL",
-	[VEC_TRAP1]	= "TRAP #1",
-	[VEC_TRAP2]	= "TRAP #2",
-	[VEC_TRAP3]	= "TRAP #3",
-	[VEC_TRAP4]	= "TRAP #4",
-	[VEC_TRAP5]	= "TRAP #5",
-	[VEC_TRAP6]	= "TRAP #6",
-	[VEC_TRAP7]	= "TRAP #7",
-	[VEC_TRAP8]	= "TRAP #8",
-	[VEC_TRAP9]	= "TRAP #9",
-	[VEC_TRAP10]	= "TRAP #10",
-	[VEC_TRAP11]	= "TRAP #11",
-	[VEC_TRAP12]	= "TRAP #12",
-	[VEC_TRAP13]	= "TRAP #13",
-	[VEC_TRAP14]	= "TRAP #14",
-	[VEC_TRAP15]	= "TRAP #15",
-	[VEC_FPBRUC]	= "FPCP BSUN",
-	[VEC_FPIR]	= "FPCP INEXACT",
-	[VEC_FPDIVZ]	= "FPCP DIV BY 0",
-	[VEC_FPUNDER]	= "FPCP UNDERFLOW",
-	[VEC_FPOE]	= "FPCP OPERAND ERROR",
-	[VEC_FPOVER]	= "FPCP OVERFLOW",
-	[VEC_FPNAN]	= "FPCP SNAN",
-	[VEC_FPUNSUP]	= "FPCP UNSUPPORTED OPERATION",
-	[VEC_MMUCFG]	= "MMU CONFIGURATION ERROR",
-	[VEC_MMUILL]	= "MMU ILLEGAL OPERATION ERROR",
-	[VEC_MMUACC]	= "MMU ACCESS LEVEL VIOLATION ERROR",
-	[VEC_RESV59]	= "UNASSIGNED RESERVED 59",
-	[VEC_UNIMPEA]	= "UNASSIGNED RESERVED 60",
-	[VEC_UNIMPII]	= "UNASSIGNED RESERVED 61",
-	[VEC_RESV62]	= "UNASSIGNED RESERVED 62",
-	[VEC_RESV63]	= "UNASSIGNED RESERVED 63",
-};
-
-static const char *space_names[] = {
-	[0]		= "Space 0",
-	[USER_DATA]	= "User Data",
-	[USER_PROGRAM]	= "User Program",
-#ifndef CONFIG_SUN3
-	[3]		= "Space 3",
-#else
-	[FC_CONTROL]	= "Control",
-#endif
-	[4]		= "Space 4",
-	[SUPER_DATA]	= "Super Data",
-	[SUPER_PROGRAM]	= "Super Program",
-	[CPU_SPACE]	= "CPU"
-};
-
-void die_if_kernel(char *,struct pt_regs *,int);
-asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
-                             unsigned long error_code);
-int send_fault_sig(struct pt_regs *regs);
-
-asmlinkage void trap_c(struct frame *fp);
-
-#if defined (CONFIG_M68060)
-static inline void access_error060 (struct frame *fp)
-{
-	unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
-
-#ifdef DEBUG
-	printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
-#endif
-
-	if (fslw & MMU060_BPE) {
-		/* branch prediction error -> clear branch cache */
-		__asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
-				      "orl   #0x00400000,%/d0\n\t"
-				      "movec %/d0,%/cacr"
-				      : : : "d0" );
-		/* return if there's no other error */
-		if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
-			return;
-	}
-
-	if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
-		unsigned long errorcode;
-		unsigned long addr = fp->un.fmt4.effaddr;
-
-		if (fslw & MMU060_MA)
-			addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
-
-		errorcode = 1;
-		if (fslw & MMU060_DESC_ERR) {
-			__flush_tlb040_one(addr);
-			errorcode = 0;
-		}
-		if (fslw & MMU060_W)
-			errorcode |= 2;
-#ifdef DEBUG
-		printk("errorcode = %d\n", errorcode );
-#endif
-		do_page_fault(&fp->ptregs, addr, errorcode);
-	} else if (fslw & (MMU060_SEE)){
-		/* Software Emulation Error.
-		 * fault during mem_read/mem_write in ifpsp060/os.S
-		 */
-		send_fault_sig(&fp->ptregs);
-	} else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
-		   send_fault_sig(&fp->ptregs) > 0) {
-		printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr);
-		printk( "68060 access error, fslw=%lx\n", fslw );
-		trap_c( fp );
-	}
-}
-#endif /* CONFIG_M68060 */
-
-#if defined (CONFIG_M68040)
-static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
-{
-	unsigned long mmusr;
-	mm_segment_t old_fs = get_fs();
-
-	set_fs(MAKE_MM_SEG(wbs));
-
-	if (iswrite)
-		asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
-	else
-		asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
-
-	asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
-
-	set_fs(old_fs);
-
-	return mmusr;
-}
-
-static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
-				   unsigned long wbd)
-{
-	int res = 0;
-	mm_segment_t old_fs = get_fs();
-
-	/* set_fs can not be moved, otherwise put_user() may oops */
-	set_fs(MAKE_MM_SEG(wbs));
-
-	switch (wbs & WBSIZ_040) {
-	case BA_SIZE_BYTE:
-		res = put_user(wbd & 0xff, (char __user *)wba);
-		break;
-	case BA_SIZE_WORD:
-		res = put_user(wbd & 0xffff, (short __user *)wba);
-		break;
-	case BA_SIZE_LONG:
-		res = put_user(wbd, (int __user *)wba);
-		break;
-	}
-
-	/* set_fs can not be moved, otherwise put_user() may oops */
-	set_fs(old_fs);
-
-
-#ifdef DEBUG
-	printk("do_040writeback1, res=%d\n",res);
-#endif
-
-	return res;
-}
-
-/* after an exception in a writeback the stack frame corresponding
- * to that exception is discarded, set a few bits in the old frame
- * to simulate what it should look like
- */
-static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
-{
-	fp->un.fmt7.faddr = wba;
-	fp->un.fmt7.ssw = wbs & 0xff;
-	if (wba != current->thread.faddr)
-	    fp->un.fmt7.ssw |= MA_040;
-}
-
-static inline void do_040writebacks(struct frame *fp)
-{
-	int res = 0;
-#if 0
-	if (fp->un.fmt7.wb1s & WBV_040)
-		printk("access_error040: cannot handle 1st writeback. oops.\n");
-#endif
-
-	if ((fp->un.fmt7.wb2s & WBV_040) &&
-	    !(fp->un.fmt7.wb2s & WBTT_040)) {
-		res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
-				       fp->un.fmt7.wb2d);
-		if (res)
-			fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
-		else
-			fp->un.fmt7.wb2s = 0;
-	}
-
-	/* do the 2nd wb only if the first one was successful (except for a kernel wb) */
-	if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
-		res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
-				       fp->un.fmt7.wb3d);
-		if (res)
-		    {
-			fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
-
-			fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
-			fp->un.fmt7.wb3s &= (~WBV_040);
-			fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
-			fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
-		    }
-		else
-			fp->un.fmt7.wb3s = 0;
-	}
-
-	if (res)
-		send_fault_sig(&fp->ptregs);
-}
-
-/*
- * called from sigreturn(), must ensure userspace code didn't
- * manipulate exception frame to circumvent protection, then complete
- * pending writebacks
- * we just clear TM2 to turn it into a userspace access
- */
-asmlinkage void berr_040cleanup(struct frame *fp)
-{
-	fp->un.fmt7.wb2s &= ~4;
-	fp->un.fmt7.wb3s &= ~4;
-
-	do_040writebacks(fp);
-}
-
-static inline void access_error040(struct frame *fp)
-{
-	unsigned short ssw = fp->un.fmt7.ssw;
-	unsigned long mmusr;
-
-#ifdef DEBUG
-	printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
-        printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
-		fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
-	printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
-		fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
-		fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
-#endif
-
-	if (ssw & ATC_040) {
-		unsigned long addr = fp->un.fmt7.faddr;
-		unsigned long errorcode;
-
-		/*
-		 * The MMU status has to be determined AFTER the address
-		 * has been corrected if there was a misaligned access (MA).
-		 */
-		if (ssw & MA_040)
-			addr = (addr + 7) & -8;
-
-		/* MMU error, get the MMUSR info for this access */
-		mmusr = probe040(!(ssw & RW_040), addr, ssw);
-#ifdef DEBUG
-		printk("mmusr = %lx\n", mmusr);
-#endif
-		errorcode = 1;
-		if (!(mmusr & MMU_R_040)) {
-			/* clear the invalid atc entry */
-			__flush_tlb040_one(addr);
-			errorcode = 0;
-		}
-
-		/* despite what documentation seems to say, RMW
-		 * accesses have always both the LK and RW bits set */
-		if (!(ssw & RW_040) || (ssw & LK_040))
-			errorcode |= 2;
-
-		if (do_page_fault(&fp->ptregs, addr, errorcode)) {
-#ifdef DEBUG
-			printk("do_page_fault() !=0\n");
-#endif
-			if (user_mode(&fp->ptregs)){
-				/* delay writebacks after signal delivery */
-#ifdef DEBUG
-			        printk(".. was usermode - return\n");
-#endif
-				return;
-			}
-			/* disable writeback into user space from kernel
-			 * (if do_page_fault didn't fix the mapping,
-                         * the writeback won't do good)
-			 */
-disable_wb:
-#ifdef DEBUG
-			printk(".. disabling wb2\n");
-#endif
-			if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
-				fp->un.fmt7.wb2s &= ~WBV_040;
-			if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
-				fp->un.fmt7.wb3s &= ~WBV_040;
-		}
-	} else {
-		/* In case of a bus error we either kill the process or expect
-		 * the kernel to catch the fault, which then is also responsible
-		 * for cleaning up the mess.
-		 */
-		current->thread.signo = SIGBUS;
-		current->thread.faddr = fp->un.fmt7.faddr;
-		if (send_fault_sig(&fp->ptregs) >= 0)
-			printk("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
-			       fp->un.fmt7.faddr);
-		goto disable_wb;
-	}
-
-	do_040writebacks(fp);
-}
-#endif /* CONFIG_M68040 */
-
-#if defined(CONFIG_SUN3)
-#include <asm/sun3mmu.h>
-
-extern int mmu_emu_handle_fault (unsigned long, int, int);
-
-/* sun3 version of bus_error030 */
-
-static inline void bus_error030 (struct frame *fp)
-{
-	unsigned char buserr_type = sun3_get_buserr ();
-	unsigned long addr, errorcode;
-	unsigned short ssw = fp->un.fmtb.ssw;
-	extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
-
-#ifdef DEBUG
-	if (ssw & (FC | FB))
-		printk ("Instruction fault at %#010lx\n",
-			ssw & FC ?
-			fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
-			:
-			fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
-	if (ssw & DF)
-		printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
-			ssw & RW ? "read" : "write",
-			fp->un.fmtb.daddr,
-			space_names[ssw & DFC], fp->ptregs.pc);
-#endif
-
-	/*
-	 * Check if this page should be demand-mapped. This needs to go before
-	 * the testing for a bad kernel-space access (demand-mapping applies
-	 * to kernel accesses too).
-	 */
-
-	if ((ssw & DF)
-	    && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
-		if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
-			return;
-	}
-
-	/* Check for kernel-space pagefault (BAD). */
-	if (fp->ptregs.sr & PS_S) {
-		/* kernel fault must be a data fault to user space */
-		if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
-		     // try checking the kernel mappings before surrender
-		     if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
-			  return;
-			/* instruction fault or kernel data fault! */
-			if (ssw & (FC | FB))
-				printk ("Instruction fault at %#010lx\n",
-					fp->ptregs.pc);
-			if (ssw & DF) {
-				/* was this fault incurred testing bus mappings? */
-				if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
-				   (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
-					send_fault_sig(&fp->ptregs);
-					return;
-				}
-
-				printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
-					ssw & RW ? "read" : "write",
-					fp->un.fmtb.daddr,
-					space_names[ssw & DFC], fp->ptregs.pc);
-			}
-			printk ("BAD KERNEL BUSERR\n");
-
-			die_if_kernel("Oops", &fp->ptregs,0);
-			force_sig(SIGKILL, current);
-			return;
-		}
-	} else {
-		/* user fault */
-		if (!(ssw & (FC | FB)) && !(ssw & DF))
-			/* not an instruction fault or data fault! BAD */
-			panic ("USER BUSERR w/o instruction or data fault");
-	}
-
-
-	/* First handle the data fault, if any.  */
-	if (ssw & DF) {
-		addr = fp->un.fmtb.daddr;
-
-// errorcode bit 0:	0 -> no page		1 -> protection fault
-// errorcode bit 1:	0 -> read fault		1 -> write fault
-
-// (buserr_type & SUN3_BUSERR_PROTERR)	-> protection fault
-// (buserr_type & SUN3_BUSERR_INVALID)	-> invalid page fault
-
-		if (buserr_type & SUN3_BUSERR_PROTERR)
-			errorcode = 0x01;
-		else if (buserr_type & SUN3_BUSERR_INVALID)
-			errorcode = 0x00;
-		else {
-#ifdef DEBUG
-			printk ("*** unexpected busfault type=%#04x\n", buserr_type);
-			printk ("invalid %s access at %#lx from pc %#lx\n",
-				!(ssw & RW) ? "write" : "read", addr,
-				fp->ptregs.pc);
-#endif
-			die_if_kernel ("Oops", &fp->ptregs, buserr_type);
-			force_sig (SIGBUS, current);
-			return;
-		}
-
-//todo: wtf is RM bit? --m
-		if (!(ssw & RW) || ssw & RM)
-			errorcode |= 0x02;
-
-		/* Handle page fault. */
-		do_page_fault (&fp->ptregs, addr, errorcode);
-
-		/* Retry the data fault now. */
-		return;
-	}
-
-	/* Now handle the instruction fault. */
-
-	/* Get the fault address. */
-	if (fp->ptregs.format == 0xA)
-		addr = fp->ptregs.pc + 4;
-	else
-		addr = fp->un.fmtb.baddr;
-	if (ssw & FC)
-		addr -= 2;
-
-	if (buserr_type & SUN3_BUSERR_INVALID) {
-		if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0))
-			do_page_fault (&fp->ptregs, addr, 0);
-       } else {
-#ifdef DEBUG
-		printk ("protection fault on insn access (segv).\n");
-#endif
-		force_sig (SIGSEGV, current);
-       }
-}
-#else
-#if defined(CPU_M68020_OR_M68030)
-static inline void bus_error030 (struct frame *fp)
-{
-	volatile unsigned short temp;
-	unsigned short mmusr;
-	unsigned long addr, errorcode;
-	unsigned short ssw = fp->un.fmtb.ssw;
-#ifdef DEBUG
-	unsigned long desc;
-
-	printk ("pid = %x  ", current->pid);
-	printk ("SSW=%#06x  ", ssw);
-
-	if (ssw & (FC | FB))
-		printk ("Instruction fault at %#010lx\n",
-			ssw & FC ?
-			fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
-			:
-			fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
-	if (ssw & DF)
-		printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
-			ssw & RW ? "read" : "write",
-			fp->un.fmtb.daddr,
-			space_names[ssw & DFC], fp->ptregs.pc);
-#endif
-
-	/* ++andreas: If a data fault and an instruction fault happen
-	   at the same time map in both pages.  */
-
-	/* First handle the data fault, if any.  */
-	if (ssw & DF) {
-		addr = fp->un.fmtb.daddr;
-
-#ifdef DEBUG
-		asm volatile ("ptestr %3,%2@,#7,%0\n\t"
-			      "pmove %%psr,%1@"
-			      : "=a&" (desc)
-			      : "a" (&temp), "a" (addr), "d" (ssw));
-#else
-		asm volatile ("ptestr %2,%1@,#7\n\t"
-			      "pmove %%psr,%0@"
-			      : : "a" (&temp), "a" (addr), "d" (ssw));
-#endif
-		mmusr = temp;
-
-#ifdef DEBUG
-		printk("mmusr is %#x for addr %#lx in task %p\n",
-		       mmusr, addr, current);
-		printk("descriptor address is %#lx, contents %#lx\n",
-		       __va(desc), *(unsigned long *)__va(desc));
-#endif
-
-		errorcode = (mmusr & MMU_I) ? 0 : 1;
-		if (!(ssw & RW) || (ssw & RM))
-			errorcode |= 2;
-
-		if (mmusr & (MMU_I | MMU_WP)) {
-			if (ssw & 4) {
-				printk("Data %s fault at %#010lx in %s (pc=%#lx)\n",
-				       ssw & RW ? "read" : "write",
-				       fp->un.fmtb.daddr,
-				       space_names[ssw & DFC], fp->ptregs.pc);
-				goto buserr;
-			}
-			/* Don't try to do anything further if an exception was
-			   handled. */
-			if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
-				return;
-		} else if (!(mmusr & MMU_I)) {
-			/* probably a 020 cas fault */
-			if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
-				printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr);
-		} else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
-			printk("invalid %s access at %#lx from pc %#lx\n",
-			       !(ssw & RW) ? "write" : "read", addr,
-			       fp->ptregs.pc);
-			die_if_kernel("Oops",&fp->ptregs,mmusr);
-			force_sig(SIGSEGV, current);
-			return;
-		} else {
-#if 0
-			static volatile long tlong;
-#endif
-
-			printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
-			       !(ssw & RW) ? "write" : "read", addr,
-			       fp->ptregs.pc, ssw);
-			asm volatile ("ptestr #1,%1@,#0\n\t"
-				      "pmove %%psr,%0@"
-				      : /* no outputs */
-				      : "a" (&temp), "a" (addr));
-			mmusr = temp;
-
-			printk ("level 0 mmusr is %#x\n", mmusr);
-#if 0
-			asm volatile ("pmove %%tt0,%0@"
-				      : /* no outputs */
-				      : "a" (&tlong));
-			printk("tt0 is %#lx, ", tlong);
-			asm volatile ("pmove %%tt1,%0@"
-				      : /* no outputs */
-				      : "a" (&tlong));
-			printk("tt1 is %#lx\n", tlong);
-#endif
-#ifdef DEBUG
-			printk("Unknown SIGSEGV - 1\n");
-#endif
-			die_if_kernel("Oops",&fp->ptregs,mmusr);
-			force_sig(SIGSEGV, current);
-			return;
-		}
-
-		/* setup an ATC entry for the access about to be retried */
-		if (!(ssw & RW) || (ssw & RM))
-			asm volatile ("ploadw %1,%0@" : /* no outputs */
-				      : "a" (addr), "d" (ssw));
-		else
-			asm volatile ("ploadr %1,%0@" : /* no outputs */
-				      : "a" (addr), "d" (ssw));
-	}
-
-	/* Now handle the instruction fault. */
-
-	if (!(ssw & (FC|FB)))
-		return;
-
-	if (fp->ptregs.sr & PS_S) {
-		printk("Instruction fault at %#010lx\n",
-			fp->ptregs.pc);
-	buserr:
-		printk ("BAD KERNEL BUSERR\n");
-		die_if_kernel("Oops",&fp->ptregs,0);
-		force_sig(SIGKILL, current);
-		return;
-	}
-
-	/* get the fault address */
-	if (fp->ptregs.format == 10)
-		addr = fp->ptregs.pc + 4;
-	else
-		addr = fp->un.fmtb.baddr;
-	if (ssw & FC)
-		addr -= 2;
-
-	if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
-		/* Insn fault on same page as data fault.  But we
-		   should still create the ATC entry.  */
-		goto create_atc_entry;
-
-#ifdef DEBUG
-	asm volatile ("ptestr #1,%2@,#7,%0\n\t"
-		      "pmove %%psr,%1@"
-		      : "=a&" (desc)
-		      : "a" (&temp), "a" (addr));
-#else
-	asm volatile ("ptestr #1,%1@,#7\n\t"
-		      "pmove %%psr,%0@"
-		      : : "a" (&temp), "a" (addr));
-#endif
-	mmusr = temp;
-
-#ifdef DEBUG
-	printk ("mmusr is %#x for addr %#lx in task %p\n",
-		mmusr, addr, current);
-	printk ("descriptor address is %#lx, contents %#lx\n",
-		__va(desc), *(unsigned long *)__va(desc));
-#endif
-
-	if (mmusr & MMU_I)
-		do_page_fault (&fp->ptregs, addr, 0);
-	else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
-		printk ("invalid insn access at %#lx from pc %#lx\n",
-			addr, fp->ptregs.pc);
-#ifdef DEBUG
-		printk("Unknown SIGSEGV - 2\n");
-#endif
-		die_if_kernel("Oops",&fp->ptregs,mmusr);
-		force_sig(SIGSEGV, current);
-		return;
-	}
-
-create_atc_entry:
-	/* setup an ATC entry for the access about to be retried */
-	asm volatile ("ploadr #2,%0@" : /* no outputs */
-		      : "a" (addr));
-}
-#endif /* CPU_M68020_OR_M68030 */
-#endif /* !CONFIG_SUN3 */
-
-asmlinkage void buserr_c(struct frame *fp)
-{
-	/* Only set esp0 if coming from user mode */
-	if (user_mode(&fp->ptregs))
-		current->thread.esp0 = (unsigned long) fp;
-
-#ifdef DEBUG
-	printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
-#endif
-
-	switch (fp->ptregs.format) {
-#if defined (CONFIG_M68060)
-	case 4:				/* 68060 access error */
-	  access_error060 (fp);
-	  break;
-#endif
-#if defined (CONFIG_M68040)
-	case 0x7:			/* 68040 access error */
-	  access_error040 (fp);
-	  break;
-#endif
-#if defined (CPU_M68020_OR_M68030)
-	case 0xa:
-	case 0xb:
-	  bus_error030 (fp);
-	  break;
-#endif
-	default:
-	  die_if_kernel("bad frame format",&fp->ptregs,0);
-#ifdef DEBUG
-	  printk("Unknown SIGSEGV - 4\n");
-#endif
-	  force_sig(SIGSEGV, current);
-	}
-}
-
-
-static int kstack_depth_to_print = 48;
-
-void show_trace(unsigned long *stack)
-{
-	unsigned long *endstack;
-	unsigned long addr;
-	int i;
-
-	printk("Call Trace:");
-	addr = (unsigned long)stack + THREAD_SIZE - 1;
-	endstack = (unsigned long *)(addr & -THREAD_SIZE);
-	i = 0;
-	while (stack + 1 <= endstack) {
-		addr = *stack++;
-		/*
-		 * If the address is either in the text segment of the
-		 * kernel, or in the region which contains vmalloc'ed
-		 * memory, it *may* be the address of a calling
-		 * routine; if so, print it so that someone tracing
-		 * down the cause of the crash will be able to figure
-		 * out the call path that was taken.
-		 */
-		if (__kernel_text_address(addr)) {
-#ifndef CONFIG_KALLSYMS
-			if (i % 5 == 0)
-				printk("\n       ");
-#endif
-			printk(" [<%08lx>] %pS\n", addr, (void *)addr);
-			i++;
-		}
-	}
-	printk("\n");
-}
-
-void show_registers(struct pt_regs *regs)
-{
-	struct frame *fp = (struct frame *)regs;
-	mm_segment_t old_fs = get_fs();
-	u16 c, *cp;
-	unsigned long addr;
-	int i;
-
-	print_modules();
-	printk("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc);
-	printk("SR: %04x  SP: %p  a2: %08lx\n", regs->sr, regs, regs->a2);
-	printk("d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
-	       regs->d0, regs->d1, regs->d2, regs->d3);
-	printk("d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
-	       regs->d4, regs->d5, regs->a0, regs->a1);
-
-	printk("Process %s (pid: %d, task=%p)\n",
-		current->comm, task_pid_nr(current), current);
-	addr = (unsigned long)&fp->un;
-	printk("Frame format=%X ", regs->format);
-	switch (regs->format) {
-	case 0x2:
-		printk("instr addr=%08lx\n", fp->un.fmt2.iaddr);
-		addr += sizeof(fp->un.fmt2);
-		break;
-	case 0x3:
-		printk("eff addr=%08lx\n", fp->un.fmt3.effaddr);
-		addr += sizeof(fp->un.fmt3);
-		break;
-	case 0x4:
-		printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n"
-			: "eff addr=%08lx pc=%08lx\n"),
-			fp->un.fmt4.effaddr, fp->un.fmt4.pc);
-		addr += sizeof(fp->un.fmt4);
-		break;
-	case 0x7:
-		printk("eff addr=%08lx ssw=%04x faddr=%08lx\n",
-			fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
-		printk("wb 1 stat/addr/data: %04x %08lx %08lx\n",
-			fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
-		printk("wb 2 stat/addr/data: %04x %08lx %08lx\n",
-			fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
-		printk("wb 3 stat/addr/data: %04x %08lx %08lx\n",
-			fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
-		printk("push data: %08lx %08lx %08lx %08lx\n",
-			fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
-			fp->un.fmt7.pd3);
-		addr += sizeof(fp->un.fmt7);
-		break;
-	case 0x9:
-		printk("instr addr=%08lx\n", fp->un.fmt9.iaddr);
-		addr += sizeof(fp->un.fmt9);
-		break;
-	case 0xa:
-		printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
-			fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
-			fp->un.fmta.daddr, fp->un.fmta.dobuf);
-		addr += sizeof(fp->un.fmta);
-		break;
-	case 0xb:
-		printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
-			fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
-			fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
-		printk("baddr=%08lx dibuf=%08lx ver=%x\n",
-			fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
-		addr += sizeof(fp->un.fmtb);
-		break;
-	default:
-		printk("\n");
-	}
-	show_stack(NULL, (unsigned long *)addr);
-
-	printk("Code:");
-	set_fs(KERNEL_DS);
-	cp = (u16 *)regs->pc;
-	for (i = -8; i < 16; i++) {
-		if (get_user(c, cp + i) && i >= 0) {
-			printk(" Bad PC value.");
-			break;
-		}
-		printk(i ? " %04x" : " <%04x>", c);
-	}
-	set_fs(old_fs);
-	printk ("\n");
-}
-
-void show_stack(struct task_struct *task, unsigned long *stack)
-{
-	unsigned long *p;
-	unsigned long *endstack;
-	int i;
-
-	if (!stack) {
-		if (task)
-			stack = (unsigned long *)task->thread.esp0;
-		else
-			stack = (unsigned long *)&stack;
-	}
-	endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
-
-	printk("Stack from %08lx:", (unsigned long)stack);
-	p = stack;
-	for (i = 0; i < kstack_depth_to_print; i++) {
-		if (p + 1 > endstack)
-			break;
-		if (i % 8 == 0)
-			printk("\n       ");
-		printk(" %08lx", *p++);
-	}
-	printk("\n");
-	show_trace(stack);
-}
-
-/*
- * The architecture-independent backtrace generator
- */
-void dump_stack(void)
-{
-	unsigned long stack;
-
-	show_trace(&stack);
-}
-
-EXPORT_SYMBOL(dump_stack);
-
-void bad_super_trap (struct frame *fp)
-{
-	console_verbose();
-	if (fp->ptregs.vector < 4 * ARRAY_SIZE(vec_names))
-		printk ("*** %s ***   FORMAT=%X\n",
-			vec_names[(fp->ptregs.vector) >> 2],
-			fp->ptregs.format);
-	else
-		printk ("*** Exception %d ***   FORMAT=%X\n",
-			(fp->ptregs.vector) >> 2,
-			fp->ptregs.format);
-	if (fp->ptregs.vector >> 2 == VEC_ADDRERR && CPU_IS_020_OR_030) {
-		unsigned short ssw = fp->un.fmtb.ssw;
-
-		printk ("SSW=%#06x  ", ssw);
-
-		if (ssw & RC)
-			printk ("Pipe stage C instruction fault at %#010lx\n",
-				(fp->ptregs.format) == 0xA ?
-				fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
-		if (ssw & RB)
-			printk ("Pipe stage B instruction fault at %#010lx\n",
-				(fp->ptregs.format) == 0xA ?
-				fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
-		if (ssw & DF)
-			printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n",
-				ssw & RW ? "read" : "write",
-				fp->un.fmtb.daddr, space_names[ssw & DFC],
-				fp->ptregs.pc);
-	}
-	printk ("Current process id is %d\n", task_pid_nr(current));
-	die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
-}
-
-asmlinkage void trap_c(struct frame *fp)
-{
-	int sig;
-	siginfo_t info;
-
-	if (fp->ptregs.sr & PS_S) {
-		if (fp->ptregs.vector == VEC_TRACE << 2) {
-			/* traced a trapping instruction on a 68020/30,
-			 * real exception will be executed afterwards.
-			 */
-		} else if (!handle_kernel_fault(&fp->ptregs))
-			bad_super_trap(fp);
-		return;
-	}
-
-	/* send the appropriate signal to the user program */
-	switch ((fp->ptregs.vector) >> 2) {
-	    case VEC_ADDRERR:
-		info.si_code = BUS_ADRALN;
-		sig = SIGBUS;
-		break;
-	    case VEC_ILLEGAL:
-	    case VEC_LINE10:
-	    case VEC_LINE11:
-		info.si_code = ILL_ILLOPC;
-		sig = SIGILL;
-		break;
-	    case VEC_PRIV:
-		info.si_code = ILL_PRVOPC;
-		sig = SIGILL;
-		break;
-	    case VEC_COPROC:
-		info.si_code = ILL_COPROC;
-		sig = SIGILL;
-		break;
-	    case VEC_TRAP1:
-	    case VEC_TRAP2:
-	    case VEC_TRAP3:
-	    case VEC_TRAP4:
-	    case VEC_TRAP5:
-	    case VEC_TRAP6:
-	    case VEC_TRAP7:
-	    case VEC_TRAP8:
-	    case VEC_TRAP9:
-	    case VEC_TRAP10:
-	    case VEC_TRAP11:
-	    case VEC_TRAP12:
-	    case VEC_TRAP13:
-	    case VEC_TRAP14:
-		info.si_code = ILL_ILLTRP;
-		sig = SIGILL;
-		break;
-	    case VEC_FPBRUC:
-	    case VEC_FPOE:
-	    case VEC_FPNAN:
-		info.si_code = FPE_FLTINV;
-		sig = SIGFPE;
-		break;
-	    case VEC_FPIR:
-		info.si_code = FPE_FLTRES;
-		sig = SIGFPE;
-		break;
-	    case VEC_FPDIVZ:
-		info.si_code = FPE_FLTDIV;
-		sig = SIGFPE;
-		break;
-	    case VEC_FPUNDER:
-		info.si_code = FPE_FLTUND;
-		sig = SIGFPE;
-		break;
-	    case VEC_FPOVER:
-		info.si_code = FPE_FLTOVF;
-		sig = SIGFPE;
-		break;
-	    case VEC_ZERODIV:
-		info.si_code = FPE_INTDIV;
-		sig = SIGFPE;
-		break;
-	    case VEC_CHK:
-	    case VEC_TRAP:
-		info.si_code = FPE_INTOVF;
-		sig = SIGFPE;
-		break;
-	    case VEC_TRACE:		/* ptrace single step */
-		info.si_code = TRAP_TRACE;
-		sig = SIGTRAP;
-		break;
-	    case VEC_TRAP15:		/* breakpoint */
-		info.si_code = TRAP_BRKPT;
-		sig = SIGTRAP;
-		break;
-	    default:
-		info.si_code = ILL_ILLOPC;
-		sig = SIGILL;
-		break;
-	}
-	info.si_signo = sig;
-	info.si_errno = 0;
-	switch (fp->ptregs.format) {
-	    default:
-		info.si_addr = (void *) fp->ptregs.pc;
-		break;
-	    case 2:
-		info.si_addr = (void *) fp->un.fmt2.iaddr;
-		break;
-	    case 7:
-		info.si_addr = (void *) fp->un.fmt7.effaddr;
-		break;
-	    case 9:
-		info.si_addr = (void *) fp->un.fmt9.iaddr;
-		break;
-	    case 10:
-		info.si_addr = (void *) fp->un.fmta.daddr;
-		break;
-	    case 11:
-		info.si_addr = (void *) fp->un.fmtb.daddr;
-		break;
-	}
-	force_sig_info (sig, &info, current);
-}
-
-void die_if_kernel (char *str, struct pt_regs *fp, int nr)
-{
-	if (!(fp->sr & PS_S))
-		return;
-
-	console_verbose();
-	printk("%s: %08x\n",str,nr);
-	show_registers(fp);
-	add_taint(TAINT_DIE);
-	do_exit(SIGSEGV);
-}
-
-/*
- * This function is called if an error occur while accessing
- * user-space from the fpsp040 code.
- */
-asmlinkage void fpsp040_die(void)
-{
-	do_exit(SIGSEGV);
-}
-
-#ifdef CONFIG_M68KFPU_EMU
-asmlinkage void fpemu_signal(int signal, int code, void *addr)
-{
-	siginfo_t info;
-
-	info.si_signo = signal;
-	info.si_errno = 0;
-	info.si_code = code;
-	info.si_addr = addr;
-	force_sig_info(signal, &info, current);
-}
-#endif

arch/m68k/kernel/traps_no.c

···
-/*
- *  linux/arch/m68knommu/kernel/traps.c
- *
- *  Copyright (C) 1993, 1994 by Hamish Macdonald
- *
- *  68040 fixes by Michael Rausch
- *  68040 fixes by Martin Apel
- *  68060 fixes by Roman Hodek
- *  68060 fixes by Jesper Skov
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file COPYING in the main directory of this archive
- * for more details.
- */
-
-/*
- * Sets up all exception vectors
- */
-#include <linux/sched.h>
-#include <linux/signal.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/user.h>
-#include <linux/string.h>
-#include <linux/linkage.h>
-#include <linux/init.h>
-#include <linux/ptrace.h>
-#include <linux/kallsyms.h>
-
-#include <asm/setup.h>
-#include <asm/fpu.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <asm/traps.h>
-#include <asm/pgtable.h>
-#include <asm/machdep.h>
-#include <asm/siginfo.h>
-
-static char const * const vec_names[] = {
-	"RESET SP", "RESET PC", "BUS ERROR", "ADDRESS ERROR",
-	"ILLEGAL INSTRUCTION", "ZERO DIVIDE", "CHK", "TRAPcc",
-	"PRIVILEGE VIOLATION", "TRACE", "LINE 1010", "LINE 1111",
-	"UNASSIGNED RESERVED 12", "COPROCESSOR PROTOCOL VIOLATION",
-	"FORMAT ERROR", "UNINITIALIZED INTERRUPT",
-	"UNASSIGNED RESERVED 16", "UNASSIGNED RESERVED 17",
-	"UNASSIGNED RESERVED 18", "UNASSIGNED RESERVED 19",
-	"UNASSIGNED RESERVED 20", "UNASSIGNED RESERVED 21",
-	"UNASSIGNED RESERVED 22", "UNASSIGNED RESERVED 23",
-	"SPURIOUS INTERRUPT", "LEVEL 1 INT", "LEVEL 2 INT", "LEVEL 3 INT",
-	"LEVEL 4 INT", "LEVEL 5 INT", "LEVEL 6 INT", "LEVEL 7 INT",
-	"SYSCALL", "TRAP #1", "TRAP #2", "TRAP #3",
-	"TRAP #4", "TRAP #5", "TRAP #6", "TRAP #7",
-	"TRAP #8", "TRAP #9", "TRAP #10", "TRAP #11",
-	"TRAP #12", "TRAP #13", "TRAP #14", "TRAP #15",
-	"FPCP BSUN", "FPCP INEXACT", "FPCP DIV BY 0", "FPCP UNDERFLOW",
-	"FPCP OPERAND ERROR", "FPCP OVERFLOW", "FPCP SNAN",
-	"FPCP UNSUPPORTED OPERATION",
-	"MMU CONFIGURATION ERROR"
-};
-
-void die_if_kernel(char *str, struct pt_regs *fp, int nr)
-{
-	if (!(fp->sr & PS_S))
-		return;
-
-	console_verbose();
-	printk(KERN_EMERG "%s: %08x\n",str,nr);
-	printk(KERN_EMERG "PC: [<%08lx>]\nSR: %04x  SP: %p  a2: %08lx\n",
-	       fp->pc, fp->sr, fp, fp->a2);
-	printk(KERN_EMERG "d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
-	       fp->d0, fp->d1, fp->d2, fp->d3);
-	printk(KERN_EMERG "d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
-	       fp->d4, fp->d5, fp->a0, fp->a1);
-
-	printk(KERN_EMERG "Process %s (pid: %d, stackpage=%08lx)\n",
-		current->comm, current->pid, PAGE_SIZE+(unsigned long)current);
-	show_stack(NULL, (unsigned long *)(fp + 1));
-	add_taint(TAINT_DIE);
-	do_exit(SIGSEGV);
-}
-
-asmlinkage void buserr_c(struct frame *fp)
-{
-	/* Only set esp0 if coming from user mode */
-	if (user_mode(&fp->ptregs))
-		current->thread.esp0 = (unsigned long) fp;
-
-#if defined(DEBUG)
-	printk (KERN_DEBUG "*** Bus Error *** Format is %x\n", fp->ptregs.format);
-#endif
-
-	die_if_kernel("bad frame format",&fp->ptregs,0);
-#if defined(DEBUG)
-	printk(KERN_DEBUG "Unknown SIGSEGV - 4\n");
-#endif
-	force_sig(SIGSEGV, current);
-}
-
-static void print_this_address(unsigned long addr, int i)
-{
-#ifdef CONFIG_KALLSYMS
-	printk(KERN_EMERG " [%08lx] ", addr);
-	print_symbol(KERN_CONT "%s\n", addr);
-#else
-	if (i % 5)
-		printk(KERN_CONT " [%08lx] ", addr);
-	else
-		printk(KERN_EMERG " [%08lx] ", addr);
-	i++;
-#endif
-}
-
-int kstack_depth_to_print = 48;
-
-static void __show_stack(struct task_struct *task, unsigned long *stack)
-{
-	unsigned long *endstack, addr;
-#ifdef CONFIG_FRAME_POINTER
-	unsigned long *last_stack;
-#endif
-	int i;
-
-	if (!stack)
-		stack = (unsigned long *)task->thread.ksp;
-
-	addr = (unsigned long) stack;
-	endstack = (unsigned long *) PAGE_ALIGN(addr);
-
-	printk(KERN_EMERG "Stack from %08lx:", (unsigned long)stack);
-	for (i = 0; i < kstack_depth_to_print; i++) {
-		if (stack + 1 + i > endstack)
-			break;
-		if (i % 8 == 0)
-			printk(KERN_EMERG "       ");
-		printk(KERN_CONT " %08lx", *(stack + i));
-	}
-	printk("\n");
-	i = 0;
-
-#ifdef CONFIG_FRAME_POINTER
-	printk(KERN_EMERG "Call Trace:\n");
-
-	last_stack = stack - 1;
-	while (stack <= endstack && stack > last_stack) {
-
-		addr = *(stack + 1);
-		print_this_address(addr, i);
-		i++;
-
-		last_stack = stack;
-		stack = (unsigned long *)*stack;
-	}
-	printk("\n");
-#else
-	printk(KERN_EMERG "Call Trace with CONFIG_FRAME_POINTER disabled:\n");
-	while (stack <= endstack) {
-		addr = *stack++;
-		/*
-		 * If the address is either in the text segment of the kernel,
-		 * or in a region which is occupied by a module then it *may*
-		 * be the address of a calling routine; if so, print it so that
-		 * someone tracing down the cause of the crash will be able to
-		 * figure out the call path that was taken.
-		 */
-		if (__kernel_text_address(addr)) {
-			print_this_address(addr, i);
-			i++;
-		}
-	}
-	printk(KERN_CONT "\n");
-#endif
-}
-
-void bad_super_trap(struct frame *fp)
-{
-	int vector = (fp->ptregs.vector >> 2) & 0xff;
-
-	console_verbose();
-	if (vector < ARRAY_SIZE(vec_names))
-		printk (KERN_WARNING "*** %s ***   FORMAT=%X\n",
-			vec_names[vector],
-			fp->ptregs.format);
-	else
-		printk (KERN_WARNING "*** Exception %d ***   FORMAT=%X\n",
-			vector,
-			fp->ptregs.format);
-	printk (KERN_WARNING "Current process id is %d\n", current->pid);
-	die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
-}
-
-asmlinkage void trap_c(struct frame *fp)
-{
-	int sig;
-	int vector = (fp->ptregs.vector >> 2) & 0xff;
-	siginfo_t info;
-
-	if (fp->ptregs.sr & PS_S) {
-		if (vector == VEC_TRACE) {
-			/* traced a trapping instruction */
-		} else
-			bad_super_trap(fp);
-		return;
-	}
-
-	/* send the appropriate signal to the user program */
-	switch (vector) {
-	    case VEC_ADDRERR:
-		info.si_code = BUS_ADRALN;
-		sig = SIGBUS;
-		break;
-	    case VEC_ILLEGAL:
-	    case VEC_LINE10:
-	    case VEC_LINE11:
-		info.si_code = ILL_ILLOPC;
-		sig = SIGILL;
-		break;
-	    case VEC_PRIV:
-		info.si_code = ILL_PRVOPC;
-		sig = SIGILL;
-		break;
-	    case VEC_COPROC:
-		info.si_code = ILL_COPROC;
-		sig = SIGILL;
-		break;
-	    case VEC_TRAP1: /* gdbserver breakpoint */
-		fp->ptregs.pc -= 2;
-		info.si_code = TRAP_TRACE;
-		sig = SIGTRAP;
-		break;
-	    case VEC_TRAP2:
-	    case VEC_TRAP3:
-	    case VEC_TRAP4:
-	    case VEC_TRAP5:
-	    case VEC_TRAP6:
-	    case VEC_TRAP7:
-	    case VEC_TRAP8:
-	    case VEC_TRAP9:
-	    case VEC_TRAP10:
-	    case VEC_TRAP11:
-	    case VEC_TRAP12:
-	    case VEC_TRAP13:
-	    case VEC_TRAP14:
-		info.si_code = ILL_ILLTRP;
-		sig = SIGILL;
-		break;
-	    case VEC_FPBRUC:
-	    case VEC_FPOE:
-	    case VEC_FPNAN:
-		info.si_code = FPE_FLTINV;
-		sig = SIGFPE;
-		break;
-	    case VEC_FPIR:
-		info.si_code = FPE_FLTRES;
-		sig = SIGFPE;
-		break;
-	    case VEC_FPDIVZ:
-		info.si_code = FPE_FLTDIV;
-		sig = SIGFPE;
-		break;
-	    case VEC_FPUNDER:
-		info.si_code = FPE_FLTUND;
-		sig = SIGFPE;
-		break;
-	    case VEC_FPOVER:
-		info.si_code = FPE_FLTOVF;
-		sig = SIGFPE;
-		break;
-	    case VEC_ZERODIV:
-		info.si_code = FPE_INTDIV;
-		sig = SIGFPE;
-		break;
-	    case VEC_CHK:
-	    case VEC_TRAP:
-		info.si_code = FPE_INTOVF;
-		sig = SIGFPE;
-		break;
-	    case VEC_TRACE:		/* ptrace single step */
-		info.si_code = TRAP_TRACE;
-		sig = SIGTRAP;
-		break;
-	    case VEC_TRAP15:		/* breakpoint */
-		info.si_code = TRAP_BRKPT;
-		sig = SIGTRAP;
-		break;
-	    default:
-		info.si_code = ILL_ILLOPC;
-		sig = SIGILL;
-		break;
-	}
-	info.si_signo = sig;
-	info.si_errno = 0;
-	switch (fp->ptregs.format) {
-	    default:
-		info.si_addr = (void *) fp->ptregs.pc;
-		break;
-	    case 2:
-		info.si_addr = (void *) fp->un.fmt2.iaddr;
-		break;
-	    case 7:
-		info.si_addr = (void *) fp->un.fmt7.effaddr;
-		break;
-	    case 9:
-		info.si_addr = (void *) fp->un.fmt9.iaddr;
-		break;
-	    case 10:
-		info.si_addr = (void *) fp->un.fmta.daddr;
-		break;
-	    case 11:
-		info.si_addr = (void *) fp->un.fmtb.daddr;
-		break;
-	}
-	force_sig_info (sig, &info, current);
-}
-
-asmlinkage void set_esp0(unsigned long ssp)
-{
-	current->thread.esp0 = ssp;
-}
-
-/*
- * The architecture-independent backtrace generator
- */
-void dump_stack(void)
-{
-	/*
-	 * We need frame pointers for this little trick, which works as follows:
-	 *
-	 * +------------+ 0x00
-	 * | Next SP	|	-> 0x0c
-	 * +------------+ 0x04
-	 * | Caller	|
-	 * +------------+ 0x08
-	 * | Local vars	|	-> our stack var
-	 * +------------+ 0x0c
-	 * | Next SP	|	-> 0x18, that is what we pass to show_stack()
-	 * +------------+ 0x10
-	 * | Caller	|
-	 * +------------+ 0x14
-	 * | Local vars	|
-	 * +------------+ 0x18
-	 * | ...	|
-	 * +------------+
-	 */
-
-	unsigned long *stack;
-
-	stack = (unsigned long *)&stack;
-	stack++;
-	__show_stack(current, stack);
-}
-EXPORT_SYMBOL(dump_stack);
-
-void show_stack(struct task_struct *task, unsigned long *stack)
-{
-	if (!stack && !task)
-		dump_stack();
-	else
-		__show_stack(task, stack);
-}