File _service:tar_scm:0002-crash-8.0.2-sw.patch of Package crash

File _service:tar_scm:0002-crash-8.0.2-sw.patch of Package crash (Revision 4d2c278ffaa6407927948319914f43dd)

Currently displaying revision 4d2c278ffaa6407927948319914f43dd , Show latest

diff -Nuar crash-8.0.2.org/Makefile crash-8.0.2.sw/Makefile
--- crash-8.0.2.org/Makefile	2022-03-14 07:58:52.278814120 +0000
+++ crash-8.0.2.sw/Makefile	2022-03-15 06:11:27.978814120 +0000
@@ -20,7 +20,7 @@
 PROGRAM=crash
 
 #
-# Supported targets: X86 ALPHA PPC IA64 PPC64 SPARC64
+# Supported targets: X86 SW_64 ALPHA PPC IA64 PPC64 SPARC64
 # TARGET and GDB_CONF_FLAGS will be configured automatically by configure
 #
 TARGET=
@@ -62,7 +62,7 @@
 CFILES=main.c tools.c global_data.c memory.c filesys.c help.c task.c \
 	kernel.c test.c gdb_interface.c configure.c net.c dev.c bpf.c \
 	printk.c \
-	alpha.c x86.c ppc.c ia64.c s390.c s390x.c s390dbf.c ppc64.c x86_64.c \
+	sw_64.c alpha.c x86.c ppc.c ia64.c s390.c s390x.c s390dbf.c ppc64.c x86_64.c \
 	arm.c arm64.c mips.c mips64.c sparc64.c \
 	extensions.c remote.c va_server.c va_server_v1.c symbols.c cmdline.c \
 	lkcd_common.c lkcd_v1.c lkcd_v2_v3.c lkcd_v5.c lkcd_v7.c lkcd_v8.c\
@@ -82,7 +82,7 @@
 OBJECT_FILES=main.o tools.o global_data.o memory.o filesys.o help.o task.o \
 	build_data.o kernel.o test.o gdb_interface.o net.o dev.o bpf.o \
 	printk.o \
-	alpha.o x86.o ppc.o ia64.o s390.o s390x.o s390dbf.o ppc64.o x86_64.o \
+	sw_64.o alpha.o x86.o ppc.o ia64.o s390.o s390x.o s390dbf.o ppc64.o x86_64.o \
 	arm.o arm64.o mips.o mips64.o sparc64.o \
 	extensions.o remote.o va_server.o va_server_v1.o symbols.o cmdline.o \
 	lkcd_common.o lkcd_v1.o lkcd_v2_v3.o lkcd_v5.o lkcd_v7.o lkcd_v8.o \
@@ -415,6 +415,9 @@
 x86.o: ${GENERIC_HFILES} ${REDHAT_HFILES} x86.c
 	${CC} -c ${CRASH_CFLAGS} x86.c -DMCLX ${WARNING_OPTIONS} ${WARNING_ERROR}
 
+sw_64.o: ${GENERIC_HFILES} sw_64.c
+	${CC} -c ${CRASH_CFLAGS} sw_64.c ${WARNING_OPTIONS} ${WARNING_ERROR}
+
 alpha.o: ${GENERIC_HFILES} alpha.c
 	${CC} -c ${CRASH_CFLAGS} alpha.c ${WARNING_OPTIONS} ${WARNING_ERROR}
 
diff -Nuar crash-8.0.2.org/configure.c crash-8.0.2.sw/configure.c
--- crash-8.0.2.org/configure.c	2022-03-14 07:58:52.278814120 +0000
+++ crash-8.0.2.sw/configure.c	2022-03-24 06:48:16.423873440 +0000
@@ -107,6 +107,7 @@
 #undef MIPS
 #undef SPARC64
 #undef MIPS64
+#undef SW_64
 
 #define UNKNOWN 0
 #define X86     1
@@ -122,6 +123,7 @@
 #define MIPS    11
 #define SPARC64 12
 #define MIPS64  13
+#define SW_64   14
 
 #define TARGET_X86    "TARGET=X86"
 #define TARGET_ALPHA  "TARGET=ALPHA"
@@ -136,6 +138,7 @@
 #define TARGET_MIPS   "TARGET=MIPS"
 #define TARGET_MIPS64 "TARGET=MIPS64"
 #define TARGET_SPARC64 "TARGET=SPARC64"
+#define TARGET_SW_64  "TARGET=SW_64"
 
 #define TARGET_CFLAGS_X86    "TARGET_CFLAGS=-D_FILE_OFFSET_BITS=64"
 #define TARGET_CFLAGS_ALPHA  "TARGET_CFLAGS="
@@ -158,6 +161,7 @@
 #define TARGET_CFLAGS_MIPS_ON_X86_64  "TARGET_CFLAGS=-m32 -D_FILE_OFFSET_BITS=64"
 #define TARGET_CFLAGS_MIPS64          "TARGET_CFLAGS="
 #define TARGET_CFLAGS_SPARC64         "TARGET_CFLAGS="
+#define TARGET_CFLAGS_SW_64  "TARGET_CFLAGS="
 
 #define GDB_TARGET_DEFAULT        "GDB_CONF_FLAGS="
 #define GDB_TARGET_ARM_ON_X86     "GDB_CONF_FLAGS=--target=arm-elf-linux"
@@ -354,6 +358,9 @@
 	static char buf[512];
 	char *p;
 
+#ifdef __sw_64__
+        target_data.target = SW_64;
+#endif
 #ifdef __alpha__
         target_data.target = ALPHA;
 #endif
@@ -614,6 +621,9 @@
 	case X86:    
 		printf("TARGET: X86\n");
 		break;
+	case SW_64: 
+		printf("TARGET: SW_64\n");
+		break;
 	case ALPHA: 
 		printf("TARGET: ALPHA\n");
 		break;
@@ -693,6 +703,10 @@
 		} else
 			target_CFLAGS = TARGET_CFLAGS_X86;
 		break;
+	case SW_64:
+		target = TARGET_SW_64;
+		target_CFLAGS = TARGET_CFLAGS_SW_64;
+		break;
 	case ALPHA:
 		target = TARGET_ALPHA;
 		target_CFLAGS = TARGET_CFLAGS_ALPHA;
@@ -1364,7 +1378,7 @@
 	printf("Vendor: Red Hat, Inc.\n");
 	printf("Packager: Dave Anderson <anderson@redhat.com>\n");
 	printf("ExclusiveOS: Linux\n");
-	printf("ExclusiveArch: %%{ix86} alpha ia64 ppc ppc64 ppc64pseries ppc64iseries x86_64 s390 s390x arm aarch64 ppc64le mips mipsel mips64el sparc64\n");
+	printf("ExclusiveArch: %%{ix86} sw_64 alpha ia64 ppc ppc64 ppc64pseries ppc64iseries x86_64 s390 s390x arm aarch64 ppc64le mips mipsel mips64el sparc64\n");
 	printf("Buildroot: %%{_tmppath}/%%{name}-root\n");
 	printf("BuildRequires: ncurses-devel zlib-devel bison\n");
 	printf("Requires: binutils\n");
@@ -1575,6 +1589,8 @@
 		target_data.initial_gdb_target = X86_64;
 	else if (strncmp(buf, "X86", strlen("X86")) == 0) 
 		target_data.initial_gdb_target = X86;
+	else if (strncmp(buf, "SW_64", strlen("SW_64")) == 0)
+		target_data.initial_gdb_target = SW_64;
 	else if (strncmp(buf, "ALPHA", strlen("ALPHA")) == 0)
 		target_data.initial_gdb_target = ALPHA;
 	else if (strncmp(buf, "PPC64", strlen("PPC64")) == 0)
@@ -1606,6 +1622,7 @@
 	{
 	case X86:    return("X86");
 	case ALPHA:  return("ALPHA");
+	case SW_64:  return("SW_64");
 	case PPC:    return("PPC");
 	case IA64:   return("IA64");
 	case S390:   return("S390");
@@ -1633,6 +1650,10 @@
                 return X86;
         else if (strncmp(name, "x86", strlen("x86")) == 0)
                 return X86;
+        else if (strncmp(name, "SW_64", strlen("SW_64")) == 0)
+                return SW_64;
+        else if (strncmp(name, "sw_64", strlen("sw_64")) == 0)
+                return SW_64;
         else if (strncmp(name, "ALPHA", strlen("ALPHA")) == 0)
                 return ALPHA;
         else if (strncmp(name, "alpha", strlen("alpha")) == 0)
diff -Nuar crash-8.0.2.org/defs.h crash-8.0.2.sw/defs.h
--- crash-8.0.2.org/defs.h	2022-03-14 07:58:52.278814120 +0000
+++ crash-8.0.2.sw/defs.h	2022-03-24 06:45:53.683873440 +0000
@@ -69,13 +69,16 @@
 #  define offsetof(TYPE, MEMBER) ((ulong)&((TYPE *)0)->MEMBER)
 #endif
 
-#if !defined(X86) && !defined(X86_64) && !defined(ALPHA) && !defined(PPC) && \
+#if !defined(X86) && !defined(X86_64) && !defined(ALPHA) && !defined(SW_64) && !defined(PPC) && \
     !defined(IA64) && !defined(PPC64) && !defined(S390) && !defined(S390X) && \
     !defined(ARM) && !defined(ARM64) && !defined(MIPS) && !defined(MIPS64) && \
     !defined(SPARC64)
 #ifdef __alpha__
 #define ALPHA
 #endif
+#ifdef __sw_64__
+#define SW_64
+#endif
 #ifdef __i386__
 #define X86
 #endif
@@ -122,6 +125,9 @@
 #ifdef X86_64
 #define NR_CPUS  (8192)
 #endif
+#ifdef SW_64
+#define NR_CPUS  (64)
+#endif
 #ifdef ALPHA
 #define NR_CPUS  (64)
 #endif
@@ -3753,6 +3759,53 @@
 
 #endif  /* ALPHA */
 
+#ifdef SW_64
+#define _64BIT_
+#define MACHINE_TYPE       "SW_64"
+
+#define PAGEBASE(X)  (((unsigned long)(X)) & (unsigned long)machdep->pagemask)
+
+#define PTOV(X)            ((unsigned long)(X)+(machdep->kvbase))
+#define VTOP(X)            ((unsigned long)(X)-(machdep->kvbase))
+#define IS_VMALLOC_ADDR(X) (vt->vmalloc_start && (ulong)(X) >= vt->vmalloc_start)
+#define KSEG_BASE_48_BIT   (0xffff800000000000)
+#define KSEG_BASE          (0xfffffc0000000000)
+#define _PFN_MASK          (0xFFFFFFFF00000000)
+#define VMALLOC_START      (0xFFFFFE0000000000)
+#define MIN_SYMBOL_VALUE   (KSEG_BASE_48_BIT)
+
+#define PGDIR_SHIFT     (PAGESHIFT() + 2*(PAGESHIFT()-3))
+#define PMD_SHIFT       (PAGESHIFT() + (PAGESHIFT()-3))
+#define PTRS_PER_PAGE   (1024)
+
+#define PTRS_PER_PGD    (1UL << (PAGESHIFT()-3))
+
+/*
+ * OSF/1 PAL-code-imposed page table bits
+ */
+#define _PAGE_VALID     0x0001
+#define _PAGE_FOR       0x0002  /* used for page protection (fault on read) */
+#define _PAGE_FOW       0x0004  /* used for page protection (fault on write) */
+#define _PAGE_FOE       0x0008  /* used for page protection (fault on exec) */
+#define _PAGE_ASM       0x0010
+#define _PAGE_KRE       0x0400  /* xxx - see below on the "accessed" bit */
+#define _PAGE_URE       0x0800  /* xxx */
+#define _PAGE_KWE       0x4000  /* used to do the dirty bit in software */
+#define _PAGE_UWE       0x8000  /* used to do the dirty bit in software */
+
+/* .. and these are ours ... */
+#define _PAGE_DIRTY     0x20000
+#define _PAGE_ACCESSED  0x40000
+
+#define SWP_TYPE(entry) (((entry) >> 32) & 0xff)
+#define SWP_OFFSET(entry) ((entry) >> 40)
+#define __swp_type(entry)   SWP_TYPE(entry)
+#define __swp_offset(entry) SWP_OFFSET(entry)
+
+#define TIF_SIGPENDING (2)
+
+#endif  /* SW_64 */
+
 #ifdef PPC
 #define _32BIT_
 #define MACHINE_TYPE       "PPC"
@@ -4428,6 +4481,10 @@
 #define MAX_HEXADDR_STRLEN (8)             
 #define UVADDR_PRLEN       (8)
 #endif
+#ifdef SW_64
+#define MAX_HEXADDR_STRLEN (16)             
+#define UVADDR_PRLEN       (11)
+#endif
 #ifdef ALPHA
 #define MAX_HEXADDR_STRLEN (16)             
 #define UVADDR_PRLEN       (11)
@@ -4641,6 +4698,12 @@
 #define SA_RESTORER             0x04000000
 #endif
 
+#ifdef SW_64
+#define SA_PROBE                SA_ONESHOT
+#define SA_SAMPLE_RANDOM        SA_RESTART
+#define SA_SHIRQ                0x40000000
+#endif
+
 #ifdef ALPHA
 #define SA_PROBE                SA_ONESHOT
 #define SA_SAMPLE_RANDOM        SA_RESTART
@@ -5020,6 +5083,9 @@
 #ifdef X86
 #define machdep_init(X) x86_init(X)
 #endif
+#ifdef SW_64
+#define machdep_init(X) sw_64_init(X)
+#endif
 #ifdef ALPHA
 #define machdep_init(X) alpha_init(X)
 #endif
@@ -5503,6 +5569,9 @@
 #ifdef X86
 #define dump_machdep_table(X) x86_dump_machdep_table(X)
 #endif
+#ifdef SW_64
+#define dump_machdep_table(X) sw_64_dump_machdep_table(X)
+#endif
 #ifdef ALPHA
 #define dump_machdep_table(X) alpha_dump_machdep_table(X)
 #endif
@@ -5909,6 +5978,19 @@
 #endif
 
 /*
+ *  sw_64.c
+ */
+#ifdef SW_64
+void sw_64_init(int);
+void sw_64_dump_machdep_table(ulong);
+#define display_idt_table() \
+        error(FATAL, "-d option is not applicable to sw_64 architecture\n")
+
+#define HWRESET_TASK(X)  ((machdep->flags & HWRESET) && is_task_active(X) && \
+                         (task_to_context(X)->processor == 0)) 
+#endif
+
+/*
  *  alpha.c
  */
 #ifdef ALPHA
diff -Nuar crash-8.0.2.org/gdb_interface.c crash-8.0.2.sw/gdb_interface.c
--- crash-8.0.2.org/gdb_interface.c	2022-03-14 07:58:52.288814120 +0000
+++ crash-8.0.2.sw/gdb_interface.c	2022-03-14 09:10:49.778814120 +0000
@@ -1053,7 +1053,7 @@
 	return TRUE;
 }
 
-#ifndef ALPHA
+#if !defined ALPHA && !defined SW_64
 /*
  *  Stub routine needed for resolution by non-alpha, modified gdb code.
  */
diff -Nuar crash-8.0.2.org/lkcd_v2_v3.c crash-8.0.2.sw/lkcd_v2_v3.c
--- crash-8.0.2.org/lkcd_v2_v3.c	2022-03-14 07:58:52.288814120 +0000
+++ crash-8.0.2.sw/lkcd_v2_v3.c	2022-03-24 07:10:23.603873440 +0000
@@ -336,7 +336,7 @@
         lkcd_print("         dha_esp: %lx\n", dha->dha_esp);
         lkcd_print("         dha_eip: %lx\n", dha->dha_eip);
 #endif
-#if defined PPC || ALPHA || IA64
+#if defined PPC || ALPHA || SW_64 || IA64
 	/* TBD */
 #endif
 	lkcd_print("        dha_regs:\n");
@@ -362,7 +362,38 @@
 	lkcd_print("             esp: %lx\n", dha->dha_regs.esp);
 	lkcd_print("             xss: %x\n", dha->dha_regs.xss);
 #endif
-#ifdef ALPHA
+#if defined ALPHA
+	lkcd_print("              r0: %lx\n", dha->dha_regs.r0);
+	lkcd_print("              r1: %lx\n", dha->dha_regs.r1);
+	lkcd_print("              r2: %lx\n", dha->dha_regs.r2);
+	lkcd_print("              r3: %lx\n", dha->dha_regs.r3);
+	lkcd_print("              r4: %lx\n", dha->dha_regs.r4);
+	lkcd_print("              r5: %lx\n", dha->dha_regs.r5);
+	lkcd_print("              r6: %lx\n", dha->dha_regs.r6);
+	lkcd_print("              r7: %lx\n", dha->dha_regs.r7);
+	lkcd_print("              r8: %lx\n", dha->dha_regs.r8);
+	lkcd_print("             r19: %lx\n", dha->dha_regs.r19);
+	lkcd_print("             r20: %lx\n", dha->dha_regs.r20);
+	lkcd_print("             r21: %lx\n", dha->dha_regs.r21);
+	lkcd_print("             r22: %lx\n", dha->dha_regs.r22);
+	lkcd_print("             r23: %lx\n", dha->dha_regs.r23);
+	lkcd_print("             r24: %lx\n", dha->dha_regs.r24);
+	lkcd_print("             r25: %lx\n", dha->dha_regs.r25);
+	lkcd_print("             r26: %lx\n", dha->dha_regs.r26);
+	lkcd_print("             r27: %lx\n", dha->dha_regs.r27);
+	lkcd_print("             r28: %lx\n", dha->dha_regs.r28);
+	lkcd_print("             hae: %lx\n", dha->dha_regs.hae);
+	lkcd_print("         trap_a0: %lx\n", dha->dha_regs.trap_a0);
+	lkcd_print("         trap_a1: %lx\n", dha->dha_regs.trap_a1);
+	lkcd_print("         trap_a2: %lx\n", dha->dha_regs.trap_a2);
+	lkcd_print("              ps: %lx\n", dha->dha_regs.ps);
+	lkcd_print("              pc: %lx\n", dha->dha_regs.pc);
+	lkcd_print("              gp: %lx\n", dha->dha_regs.gp);
+	lkcd_print("             r16: %lx\n", dha->dha_regs.r16);
+	lkcd_print("             r17: %lx\n", dha->dha_regs.r17);
+	lkcd_print("             r18: %lx\n", dha->dha_regs.r18);
+#endif
+#if defined SW_64
 	lkcd_print("              r0: %lx\n", dha->dha_regs.r0);
 	lkcd_print("              r1: %lx\n", dha->dha_regs.r1);
 	lkcd_print("              r2: %lx\n", dha->dha_regs.r2);
diff -Nuar crash-8.0.2.org/lkcd_vmdump_v2_v3.h crash-8.0.2.sw/lkcd_vmdump_v2_v3.h
--- crash-8.0.2.org/lkcd_vmdump_v2_v3.h	2022-03-14 07:58:52.288814120 +0000
+++ crash-8.0.2.sw/lkcd_vmdump_v2_v3.h	2022-03-24 06:53:52.563873440 +0000
@@ -98,7 +98,7 @@
 
 #endif /* ARM || X86 || PPC */
 
-#if defined(ALPHA) || defined(IA64) || defined(X86_64) || defined(PPC64)
+#if defined(ALPHA) || defined(SW_64) || defined(IA64) || defined(X86_64) || defined(PPC64)
 
 /* 
  *  Plug in the real ../arch/alpha/vmdump.h when available.  For now the
diff -Nuar crash-8.0.2.org/sw_64.c crash-8.0.2.sw/sw_64.c
--- crash-8.0.2.org/sw_64.c	1970-01-01 00:00:00.000000000 +0000
+++ crash-8.0.2.sw/sw_64.c	2022-03-24 07:15:25.743873440 +0000
@@ -0,0 +1,2733 @@
+/* sw_64.c - core analysis suite
+ *
+ * Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
+ * Copyright (C) 2002-2006, 2010-2013 David Anderson
+ * Copyright (C) 2002-2006, 2010-2013 Red Hat, Inc. All rights reserved.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */ 
+#ifdef SW_64
+#include "defs.h"
+
+static void sw_64_back_trace(struct gnu_request *, struct bt_info *);
+static int sw_64_trace_status(struct gnu_request *, struct bt_info *);
+static void sw_64_exception_frame(ulong, ulong, 
+	struct gnu_request *, struct bt_info *);
+static void sw_64_frame_offset(struct gnu_request *, ulong);
+static int sw_64_backtrace_resync(struct gnu_request *, ulong,
+	struct bt_info *);
+static void sw_64_print_stack_entry(struct gnu_request *, ulong, 
+	char *, ulong, struct bt_info *);
+static int sw_64_resync_speculate(struct gnu_request *, ulong,struct bt_info *);
+static int sw_64_dis_filter(ulong, char *, unsigned int);
+static void dis_address_translation(ulong, char *, unsigned int);
+static void sw_64_cmd_mach(void);
+static int sw_64_get_smp_cpus(void);
+static void sw_64_display_machine_stats(void);
+static void sw_64_dump_line_number(char *, ulong);
+static void display_hwrpb(unsigned int);
+static void sw_64_post_init(void);
+static struct line_number_hook sw_64_line_number_hooks[];
+
+
+#define SW_64_CONTINUE_TRACE     (1)
+#define SW_64_END_OF_TRACE       (2)
+#define SW_64_EXCEPTION_FRAME    (3)
+#define SW_64_SYSCALL_FRAME      (4)
+#define SW_64_MM_FAULT           (5)
+#define SW_64_INTERRUPT_PENDING  (6)
+#define SW_64_RESCHEDULE         (7)
+#define SW_64_DOWN_FAILED        (8)
+#define SW_64_RET_FROM_SMP_FORK  (9)
+#define SW_64_SIGNAL_RETURN     (10)
+#define SW_64_STRACE            (11)
+
+static int sw_64_eframe_search(struct bt_info *);
+static int sw_64_uvtop(struct task_context *, ulong, physaddr_t *, int);
+static int sw_64_kvtop(struct task_context *, ulong, physaddr_t *, int);
+static void sw_64_back_trace_cmd(struct bt_info *);
+static ulong sw_64_get_task_pgd(ulong task);
+static ulong sw_64_processor_speed(void);
+static void sw_64_dump_irq(int);
+static void sw_64_get_stack_frame(struct bt_info *, ulong *, ulong *);
+static void get_sw_64_frame(struct bt_info *, ulong *, ulong *);
+static int verify_user_eframe(struct bt_info *, ulong, ulong);
+static int sw_64_translate_pte(ulong, void *, ulonglong);
+static uint64_t sw_64_memory_size(void);
+static ulong sw_64_vmalloc_start(void);
+static int sw_64_is_task_addr(ulong);
+static int sw_64_verify_symbol(const char *, ulong, char);
+
+struct percpu_data {
+	ulong halt_PC;
+	ulong halt_ra;
+	ulong halt_pv;
+};
+#define GET_HALT_PC  0x1
+#define GET_HALT_RA  0x2
+#define GET_HALT_PV  0x3
+static ulong get_percpu_data(int, ulong, struct percpu_data *);
+
+/*
+ *  Do all necessary machine-specific setup here.  This is called three times,
+ *  before symbol table initialization, and before and after GDB has been 
+ *  initialized.
+ */
+void
+sw_64_init(int when)
+{
+	int tmp;
+
+	switch (when)
+	{
+	case PRE_SYMTAB:
+		machdep->verify_symbol = sw_64_verify_symbol;
+                if (pc->flags & KERNEL_DEBUG_QUERY)
+                        return;
+                machdep->pagesize = memory_page_size();
+                machdep->pageshift = ffs(machdep->pagesize) - 1;
+                machdep->pageoffset = machdep->pagesize - 1;
+                machdep->pagemask = ~(machdep->pageoffset);
+		machdep->stacksize = machdep->pagesize * 2;
+                if ((machdep->pgd = (char *)malloc(PAGESIZE())) == NULL)
+                        error(FATAL, "cannot malloc pgd space.");
+                if ((machdep->pmd = (char *)malloc(PAGESIZE())) == NULL)
+                        error(FATAL, "cannot malloc pmd space.");
+                if ((machdep->ptbl = (char *)malloc(PAGESIZE())) == NULL)
+                        error(FATAL, "cannot malloc ptbl space.");
+                machdep->last_pgd_read = 0;
+                machdep->last_pmd_read = 0;
+                machdep->last_ptbl_read = 0;
+		machdep->verify_paddr = generic_verify_paddr;
+		machdep->ptrs_per_pgd = PTRS_PER_PGD;
+		break;
+		
+	case PRE_GDB:
+	        switch (symbol_value("_stext") & KSEG_BASE)
+	        {
+	        case KSEG_BASE:
+	                machdep->kvbase = KSEG_BASE;
+	                break;
+	
+	        case KSEG_BASE_48_BIT:
+	                machdep->kvbase = KSEG_BASE_48_BIT;
+	                break;
+	
+	        default:
+	                error(FATAL, 
+			    "cannot determine KSEG base from _stext: %lx\n",
+	                        symbol_value("_stext"));
+	        }
+
+		machdep->identity_map_base = machdep->kvbase;
+		machdep->is_kvaddr = generic_is_kvaddr;
+                machdep->is_uvaddr = generic_is_uvaddr;
+	        machdep->eframe_search = sw_64_eframe_search;
+	        machdep->back_trace = sw_64_back_trace_cmd;
+	        machdep->processor_speed = sw_64_processor_speed;
+	        machdep->uvtop = sw_64_uvtop;
+	        machdep->kvtop = sw_64_kvtop;
+	        machdep->get_task_pgd = sw_64_get_task_pgd;
+		if (symbol_exists("irq_desc"))
+			machdep->dump_irq = generic_dump_irq;
+		else
+			machdep->dump_irq = sw_64_dump_irq;
+		machdep->get_stack_frame = sw_64_get_stack_frame;
+		machdep->get_stackbase = generic_get_stackbase;
+		machdep->get_stacktop = generic_get_stacktop;
+		machdep->translate_pte = sw_64_translate_pte;
+		machdep->memory_size = sw_64_memory_size;
+		machdep->vmalloc_start = sw_64_vmalloc_start;
+		machdep->is_task_addr = sw_64_is_task_addr;
+		if (symbol_exists("console_crash")) {
+			get_symbol_data("console_crash", sizeof(int), &tmp);
+			if (tmp)
+				machdep->flags |= HWRESET;
+		}
+		machdep->dis_filter = sw_64_dis_filter;
+		machdep->cmd_mach = sw_64_cmd_mach;
+		machdep->get_smp_cpus = sw_64_get_smp_cpus;
+		machdep->line_number_hooks = sw_64_line_number_hooks;
+		machdep->value_to_symbol = generic_machdep_value_to_symbol;
+                machdep->init_kernel_pgd = NULL;
+		break;
+
+	case POST_GDB:
+		MEMBER_OFFSET_INIT(thread_struct_ptbr, 
+			"thread_struct", "ptbr");
+		MEMBER_OFFSET_INIT(hwrpb_struct_cycle_freq, 
+			"hwrpb_struct", "cycle_freq");
+		MEMBER_OFFSET_INIT(hwrpb_struct_processor_offset,
+			"hwrpb_struct", "processor_offset");
+		MEMBER_OFFSET_INIT(hwrpb_struct_processor_size,
+			"hwrpb_struct", "processor_size");
+		MEMBER_OFFSET_INIT(percpu_struct_halt_PC,
+			"percpu_struct", "halt_PC");
+		MEMBER_OFFSET_INIT(percpu_struct_halt_ra, 
+			"percpu_struct", "halt_ra");
+                MEMBER_OFFSET_INIT(percpu_struct_halt_pv,
+                        "percpu_struct", "halt_pv");
+		MEMBER_OFFSET_INIT(switch_stack_r26,
+			"switch_stack", "r26");
+        	if (symbol_exists("irq_action"))
+			ARRAY_LENGTH_INIT(machdep->nr_irqs, irq_action, 
+				"irq_action", NULL, 0);
+        	else if (symbol_exists("irq_desc"))
+                	ARRAY_LENGTH_INIT(machdep->nr_irqs, irq_desc, 
+				"irq_desc", NULL, 0);
+        	else
+                	machdep->nr_irqs = 0;
+		if (!machdep->hz)
+			machdep->hz = HZ;
+		break;
+
+	case POST_INIT:
+		sw_64_post_init();
+		break;
+	}
+}
+
+/*
+ *  Unroll a kernel stack.
+ */
+static void
+sw_64_back_trace_cmd(struct bt_info *bt)
+{
+	char buf[BUFSIZE];
+	struct gnu_request *req;
+
+        bt->flags |= BT_EXCEPTION_FRAME;
+
+        if (CRASHDEBUG(1) || bt->debug)
+                fprintf(fp, " => PC: %lx (%s) FP: %lx \n",
+                        bt->instptr, value_to_symstr(bt->instptr, buf, 0),
+			bt->stkptr );
+
+        req = (struct gnu_request *)GETBUF(sizeof(struct gnu_request));
+        req->command = GNU_STACK_TRACE;
+        req->flags = GNU_RETURN_ON_ERROR;
+        req->buf = GETBUF(BUFSIZE);
+        req->debug = bt->debug;
+        req->task = bt->task;
+
+        req->pc = bt->instptr;
+        req->sp = bt->stkptr;
+
+        if (bt->flags & BT_USE_GDB) {
+                strcpy(req->buf, "backtrace");
+                gdb_interface(req);
+        }
+        else
+                sw_64_back_trace(req, bt);
+
+        FREEBUF(req->buf);
+        FREEBUF(req);
+}
+
+
+/*
+ *  Unroll the kernel stack.
+ */
+
+#define SW_64_BACKTRACE_SPECULATE(X) 				        \
+{									\
+        speculate_location = X;				                \
+							                \
+        if (bt->flags & BT_SPECULATE)					\
+                return;							\
+									\
+        BZERO(btloc, sizeof(struct bt_info));                           \
+	btloc->task = req->task;                                        \
+	btloc->tc = bt->tc;                                             \
+	btloc->stackbase = bt->stackbase;                               \
+	btloc->stacktop = bt->stacktop;                                 \
+	btloc->flags = BT_TEXT_SYMBOLS_NOPRINT;                         \
+        hook.eip = 0; 					                \
+	hook.esp = req->lastsp ? req->lastsp + sizeof(long) : 0;        \
+	btloc->hp = &hook;                                              \
+									\
+        back_trace(btloc);	                                        \
+									\
+        if (hook.esp && hook.eip) {					\
+                req->hookp = &hook;					\
+                if (sw_64_resync_speculate(req, bt->flags, bt)) {	\
+                        req->pc = hook.eip;				\
+                        req->sp = hook.esp;				\
+                        continue; 					\
+                }							\
+		goto show_remaining_text;			        \
+        }								\
+	goto show_remaining_text;					\
+}								
+
+
+static void
+sw_64_back_trace(struct gnu_request *req, struct bt_info *bt)
+{
+	char buf[BUFSIZE];
+        int frame;
+	int done;
+	int status;
+        struct stack_hook hook;
+	int eframe_same_pc_ra_function;
+	int speculate_location;
+	struct bt_info bt_info, *btloc;
+
+	frame = 0;
+	req->curframe = 0;
+	btloc = &bt_info;
+
+	if (!IS_KVADDR(req->pc)) {
+		if (BT_REFERENCE_CHECK(bt))
+			return;
+
+		if ((machdep->flags & HWRESET) && is_task_active(req->task)) {
+			fprintf(fp, "(hardware reset while in user space)\n");
+			return;
+		}
+		
+		fprintf(fp, "invalid pc: %lx\n", req->pc); 
+
+        	sw_64_exception_frame(USER_EFRAME_ADDR(req->task),  
+			BT_USER_EFRAME, req, bt);
+
+		return;
+	}
+
+
+        for (done = FALSE; !done && (frame < 100); frame++) {
+
+		speculate_location = 0;
+
+		if ((req->name = closest_symbol(req->pc)) == NULL) {
+			req->ra = req->pc = 0;
+                        if (sw_64_backtrace_resync(req, 
+			    bt->flags | BT_FROM_CALLFRAME, bt)) 
+                       		continue; 
+
+			if (BT_REFERENCE_FOUND(bt))
+				return;
+
+			SW_64_BACKTRACE_SPECULATE(1);
+		}
+
+                if (!INSTACK(req->sp, bt))
+                        break;
+
+		if (!is_kernel_text(req->pc)) 
+			SW_64_BACKTRACE_SPECULATE(2);
+
+		sw_64_print_stack_entry(req, req->pc, req->name,
+			bt->flags | BT_SAVE_LASTSP, bt);
+
+		if (BT_REFERENCE_FOUND(bt))
+			return;
+
+		switch (status = sw_64_trace_status(req, bt))
+		{
+		case SW_64_CONTINUE_TRACE:
+			sw_64_frame_offset(req, 0);
+			if (!req->value) {
+				done = TRUE;
+				break;
+			}
+			req->prevpc = req->pc;
+			req->pc = GET_STACK_ULONG(req->sp);
+			req->prevsp = req->sp;
+                        req->sp += req->value;
+			break;
+
+		case SW_64_END_OF_TRACE:
+			done = TRUE;
+			break;
+
+		case SW_64_STRACE:
+                        sw_64_exception_frame(req->sp, 
+				BT_USER_EFRAME|BT_STRACE, req, bt);
+                        done = TRUE;
+			break;
+
+		case SW_64_RET_FROM_SMP_FORK:
+                        sw_64_exception_frame(USER_EFRAME_ADDR(req->task), 
+				BT_USER_EFRAME|BT_RET_FROM_SMP_FORK, req, bt);
+			done = TRUE;
+			break;
+
+                case SW_64_DOWN_FAILED:
+                        frame++;
+                        sw_64_print_stack_entry(req,
+                                req->pc, closest_symbol(req->pc),
+                                bt->flags | BT_SAVE_LASTSP, bt);
+
+			if (BT_REFERENCE_FOUND(bt))
+				return;
+
+                        sw_64_frame_offset(req, 0);
+                        if (!req->value) {
+                                done = TRUE;
+                                break;
+                        }
+                        req->prevpc = req->pc;
+			req->pc = GET_STACK_ULONG(req->sp);
+                        req->prevsp = req->sp;
+                        req->sp += req->value;
+                        break;
+
+                case SW_64_RESCHEDULE:
+                        sw_64_exception_frame(USER_EFRAME_ADDR(req->task),
+                                BT_USER_EFRAME|BT_RESCHEDULE, req, bt);
+                        done = TRUE;
+                        break;
+
+		case SW_64_MM_FAULT:
+                        sw_64_exception_frame(req->sp, bt->flags, req, bt);
+
+                        if (!IS_KVADDR(req->pc)) {
+				done = TRUE;
+                                break;
+			}
+
+                        sw_64_frame_offset(req, 0);
+                        if (!req->value) {
+                                done = TRUE;
+                                break;
+                        }
+
+                        frame++;
+			sw_64_print_stack_entry(req,
+				req->pc, closest_symbol(req->pc), 
+				bt->flags | BT_SAVE_LASTSP, bt);
+
+			if (BT_REFERENCE_FOUND(bt))
+				return;
+
+                        if (!IS_KVADDR(req->pc)) {
+                                done = TRUE;
+				break;
+			}
+
+			req->prevpc = req->pc;
+			req->pc = GET_STACK_ULONG(req->sp);
+			req->prevsp = req->sp;
+                        req->sp += req->value;
+                        break;
+
+		case SW_64_SYSCALL_FRAME:
+			req->sp = verify_user_eframe(bt, req->task, req->sp) ?
+				req->sp : USER_EFRAME_ADDR(req->task);
+
+                        sw_64_exception_frame(req->sp, bt->flags, req, bt);
+
+			if (!IS_KVADDR(req->pc)) {
+				done = TRUE;
+				break;
+			}
+
+			sw_64_frame_offset(req, 0);
+                        if (!req->value) {
+                                done = TRUE;
+                                break;
+                        }
+			req->prevpc = req->pc;
+			req->pc = GET_STACK_ULONG(req->sp);
+			req->prevsp = req->sp;
+                        req->sp += req->value;
+                        break;
+
+		case SW_64_SIGNAL_RETURN:
+                        sw_64_exception_frame(USER_EFRAME_ADDR(req->task),
+                                bt->flags, req, bt);
+			done = TRUE;
+			break;
+
+		case SW_64_EXCEPTION_FRAME:
+			sw_64_frame_offset(req, 0);
+                        if (!req->value) {
+				fprintf(fp, 
+                       "SW_64 EXCEPTION FRAME w/no frame offset for %lx (%s)\n",
+					req->pc, 
+					value_to_symstr(req->pc, buf, 0));
+                                done = TRUE;
+                                break;
+                        }
+
+			sw_64_exception_frame(req->sp + req->value, 
+				bt->flags, req, bt);
+
+			if (!IS_KVADDR(req->pc)) {
+                                done = TRUE;
+                                break;
+			}
+
+			sw_64_frame_offset(req, 0);
+
+                        if (!req->value) {
+                                fprintf(fp,
+                       "SW_64 EXCEPTION FRAME w/no frame offset for %lx (%s)\n",
+                                        req->pc, 
+					value_to_symstr(req->pc, buf, 0));
+                                done = TRUE;
+                                break;
+                        }
+			
+			eframe_same_pc_ra_function = 
+				SAME_FUNCTION(req->pc, req->ra);
+	
+			frame++;
+			sw_64_print_stack_entry(req, req->pc,
+				closest_symbol(req->pc), 
+				bt->flags | BT_SAVE_LASTSP, bt);
+
+			if (BT_REFERENCE_FOUND(bt))
+				return;
+
+			if (!IS_KVADDR(req->pc)) {
+				done = TRUE;
+				break;
+			}
+
+			if (STREQ(closest_symbol(req->pc), 
+			    "ret_from_reschedule")) {
+                        	sw_64_exception_frame(
+				    USER_EFRAME_ADDR(req->task), 
+				    BT_USER_EFRAME|BT_RESCHEDULE, req, bt);
+                        	done = TRUE;
+				break;
+			}
+
+			req->prevpc = req->pc;
+			req->pc = GET_STACK_ULONG(req->sp);
+
+			if (!is_kernel_text(req->pc)) {
+				if (sw_64_backtrace_resync(req, 
+				    bt->flags | BT_FROM_EXCEPTION, bt))
+					break;
+
+				if (BT_REFERENCE_FOUND(bt))
+					return;
+
+				SW_64_BACKTRACE_SPECULATE(3);
+			}
+
+			if (!eframe_same_pc_ra_function && 
+			    (req->pc != req->ra)) {
+				req->pc = req->ra;
+				break;
+			}
+
+			req->prevsp = req->sp;
+                        req->sp += req->value;
+			break;
+
+		case SW_64_INTERRUPT_PENDING:
+			sw_64_frame_offset(req, 0);
+                        if (!req->value) {
+				req->prevpc = req->pc;
+                                req->pc = req->addr;
+				req->prevsp = req->sp;
+				req->sp = req->frame;
+                        } else {
+				req->prevpc = req->pc;
+				req->pc = GET_STACK_ULONG(req->sp);
+				req->prevsp = req->sp;
+                        	req->sp += req->value;
+			}
+			break;
+		}
+        }
+
+	return;
+
+show_remaining_text:
+
+	if (BT_REFERENCE_CHECK(bt))
+		return;
+
+        BZERO(btloc, sizeof(struct bt_info));                         
+        btloc->task = req->task;                                       
+	btloc->tc = bt->tc;
+	btloc->stackbase = bt->stackbase;
+	btloc->stacktop = bt->stacktop;
+        btloc->flags = BT_TEXT_SYMBOLS_NOPRINT;                        
+        hook.esp = req->lastsp + sizeof(long);
+        btloc->hp = &hook; 
+        back_trace(btloc);
+
+        if (hook.eip) {
+       		fprintf(fp,
+"NOTE: cannot resolve trace from this point -- remaining text symbols on stack:\n");
+		btloc->flags = BT_TEXT_SYMBOLS_PRINT|BT_ERROR_MASK;
+        	hook.esp = req->lastsp + sizeof(long);
+        	back_trace(btloc);
+	} else 
+       		fprintf(fp, 
+"NOTE: cannot resolve trace from this point -- no remaining text symbols\n");
+
+	if (CRASHDEBUG(1))
+		fprintf(fp, "speculate_location: %d\n", speculate_location);
+
+	sw_64_exception_frame(USER_EFRAME_ADDR(req->task), 
+		BT_USER_EFRAME, req, bt);
+}
+
+/*
+ *  print one entry of a stack trace
+ */
+static void 
+sw_64_print_stack_entry(struct gnu_request *req, 
+			ulong callpc, 	
+			char *name, 
+			ulong flags,
+			struct bt_info *bt)
+{
+	struct load_module *lm;
+
+	if (BT_REFERENCE_CHECK(bt)) {
+                switch (bt->ref->cmdflags & (BT_REF_SYMBOL|BT_REF_HEXVAL))
+                {
+                case BT_REF_SYMBOL:
+			if (STREQ(name, bt->ref->str) ||
+			    (STREQ(name, "strace") && 
+			    STREQ(bt->ref->str, "entSys"))) {
+				bt->ref->cmdflags |= BT_REF_FOUND;
+			} 
+			break;
+
+		case BT_REF_HEXVAL:
+			if (bt->ref->hexval == callpc)
+				bt->ref->cmdflags |= BT_REF_FOUND;
+			break;
+		}
+	} else {
+		fprintf(fp, "%s#%d [%lx] %s at %lx",
+        		req->curframe < 10 ? " " : "", req->curframe, req->sp,
+			STREQ(name, "strace") ?  "strace (via entSys)" : name, 
+			callpc);
+		if (module_symbol(callpc, NULL, &lm, NULL, 0))
+			fprintf(fp, " [%s]", lm->mod_name);
+		fprintf(fp, "\n");
+	}
+
+	if (!(flags & BT_SPECULATE))
+		req->curframe++;
+
+	if (flags & BT_SAVE_LASTSP)
+		req->lastsp = req->sp;
+
+	if (BT_REFERENCE_CHECK(bt))
+		return;
+
+	if (flags & BT_LINE_NUMBERS) 
+		sw_64_dump_line_number(name, callpc);
+}
+
+static const char *hook_files[] = {
+        "arch/sw_64/kernel/entry.S",
+        "arch/sw_64/kernel/head.S",
+	"init/main.c",
+        "arch/sw_64/kernel/smp.c",
+};
+
+#define ENTRY_S      ((char **)&hook_files[0])
+#define HEAD_S       ((char **)&hook_files[1])
+#define MAIN_C       ((char **)&hook_files[2])
+#define SMP_C        ((char **)&hook_files[3])
+
+static struct line_number_hook sw_64_line_number_hooks[] = {
+	{"entInt", ENTRY_S},
+	{"entMM", ENTRY_S},
+	{"entArith", ENTRY_S},
+	{"entIF", ENTRY_S},
+	{"entDbg", ENTRY_S},
+	{"kernel_clone", ENTRY_S},
+	{"kernel_thread", ENTRY_S},
+	{"__kernel_execve", ENTRY_S},
+	{"do_switch_stack", ENTRY_S},
+	{"undo_switch_stack", ENTRY_S},
+	{"entUna", ENTRY_S},
+	{"entUnaUser", ENTRY_S},
+	{"sys_fork", ENTRY_S},
+	{"sys_clone", ENTRY_S},
+	{"sys_vfork", ENTRY_S},
+	{"sw_64_switch_to", ENTRY_S},
+	{"entSys", ENTRY_S},
+	{"ret_from_sys_call", ENTRY_S},
+	{"ret_from_reschedule", ENTRY_S},
+	{"restore_all", ENTRY_S},
+	{"strace", ENTRY_S},
+	{"strace_success", ENTRY_S},
+	{"strace_error", ENTRY_S},
+	{"syscall_error", ENTRY_S},
+	{"ret_success", ENTRY_S},
+	{"signal_return", ENTRY_S},
+	{"ret_from_fork", ENTRY_S},
+	{"reschedule", ENTRY_S},
+	{"sys_sigreturn", ENTRY_S},
+	{"sys_rt_sigreturn", ENTRY_S},
+	{"sys_sigsuspend", ENTRY_S},
+	{"sys_rt_sigsuspend", ENTRY_S},
+	{"ret_from_smpfork", ENTRY_S},
+
+	{"_stext", HEAD_S},
+	{"__start", HEAD_S},
+	{"__smp_callin", HEAD_S},
+	{"cserve_ena", HEAD_S},
+	{"cserve_dis", HEAD_S},
+	{"halt", HEAD_S},
+
+	{"start_kernel", MAIN_C},
+
+	{"smp_callin", SMP_C},
+
+       {NULL, NULL}    /* list must be NULL-terminated */
+};
+
+static void
+sw_64_dump_line_number(char *name, ulong callpc)
+{
+        char buf[BUFSIZE], *p;
+        int retries;
+
+	retries = 0;
+try_closest:
+	get_line_number(callpc, buf, FALSE);
+	if (strlen(buf)) {
+		if (retries) {
+			p = strstr(buf, ": ");
+			if (p)
+				*p = NULLCHAR;
+		} 
+		fprintf(fp, "    %s\n", buf);
+	} else {
+		if (retries)
+			fprintf(fp, GDB_PATCHED() ? 
+			  "" : "    (cannot determine file and line number)\n");
+		else {
+			retries++;
+			callpc = closest_symbol_value(callpc);
+			goto try_closest;
+		}
+	}
+}
+
+
+/*
+ *  Look for the frame size storage at the beginning of a function.
+ *  If it's not obvious, try gdb.
+ *
+ *  For future reference, here's where the numbers come from:
+ *
+ *    0xfffffc00003217e8 <schedule+8>:        subq    sp,0x50,sp
+ *    fffffc00003217e8:  43ca153e
+ *    010000 11110 01010000 1 0101001 11110
+ *    
+ *    0xfffffc0000321668 <schedule_timeout+8>:        subq    sp,0x60,sp
+ *    fffffc0000321668:  43cc153e
+ *    010000 11110 01100000 1 0101001 11110
+ *    
+ *    0xfffffc000035d028 <do_select+8>:       subq    sp,0x70,sp
+ *    fffffc000035d028:  43ce153e
+ *    010000 11110 01110000 1 0101001 11110
+ *    
+ *    0100 0011 110x xxxx xxx1 0101 0011 1110
+ *    1111 1111 111x xxxx xxx1 1111 1111 1111
+ *    0000 0000 0001 1111 1110 0000 0000 0000
+ *       f    f    e    0    1    f    f    f  instruction mask
+ *       0    0    1    f    e    0    0    0  offset
+ *    
+ *    stq     ra,0(sp)
+ *    fffffc000035d034:  b75e0000
+ */
+
+static void
+sw_64_frame_offset(struct gnu_request *req, ulong alt_pc)
+{
+	uint *ip, ival;
+	ulong value;
+
+	req->value = value = 0;
+
+	if (alt_pc && !is_kernel_text(alt_pc))
+		error(FATAL, 
+		    "trying to get frame offset of non-text address: %lx\n",
+			alt_pc);
+	else if (!alt_pc && !is_kernel_text(req->pc))
+                error(FATAL, 
+                    "trying to get frame offset of non-text address: %lx\n",
+                        req->pc);
+
+	ip = alt_pc ? (int *)closest_symbol_value(alt_pc) :
+		      (int *)closest_symbol_value(req->pc);
+	if (!ip)
+		goto use_gdb;
+
+	ival = 0;
+
+ 	/*  
+	 *  Don't go any farther than "stq ra,0(sp)" (0xb75e0000)
+	 */
+	while (ival != 0xb75e0000) {
+		if (!text_value_cache((ulong)ip, 0, &ival)) {
+	        	readmem((ulong)ip, KVADDR, &ival,
+                		sizeof(uint), "uncached text value", 
+				FAULT_ON_ERROR); 
+			text_value_cache((ulong)ip, ival, NULL);
+		}
+
+		if ((ival & 0xffe01fff) == 0x43c0153e) {
+			value = (ival & 0x1fe000) >> 13;
+			break;
+		}
+		ip++;
+	}
+
+	if (value) {
+		req->value = value;
+		return;
+	}
+
+use_gdb:
+#ifndef GDB_5_3
+{
+	static int gdb_frame_offset_warnings = 10;
+
+	if (gdb_frame_offset_warnings-- > 0)
+		error(WARNING, 
+	        "GNU_ALPHA_FRAME_OFFSET functionality not ported to gdb\n");
+}
+#endif
+	req->command = GNU_ALPHA_FRAME_OFFSET;
+	if (alt_pc) {
+		ulong pc_save;
+        	pc_save = req->pc; 
+        	req->pc = alt_pc;
+        	gdb_interface(req);
+        	req->pc = pc_save;
+	} else
+        	gdb_interface(req);
+}
+
+/*
+ *  Look for key routines that either mean the trace has ended or has
+ *  bumped into an exception frame.
+ */
+int
+sw_64_trace_status(struct gnu_request *req, struct bt_info *bt)
+{
+	ulong value;
+	char *func;
+	ulong frame;
+
+	req->addr = 0;
+	func = req->name;
+	frame = req->sp;
+
+	if (STREQ(func, "start_kernel") || 
+	    STREQ(func, "smp_callin") ||
+	    STREQ(func, "kernel_thread") ||
+	    STREQ(func, "__kernel_thread"))
+		return SW_64_END_OF_TRACE;
+
+	if (STREQ(func, "ret_from_smp_fork") ||
+	    STREQ(func, "ret_from_smpfork"))
+		return SW_64_RET_FROM_SMP_FORK;
+
+	if (STREQ(func, "entSys")) 
+		return SW_64_SYSCALL_FRAME;
+
+	if (STREQ(func, "entMM")) {
+		req->sp += 56;       /* see entMM in entry.S */
+		return SW_64_MM_FAULT;
+	}
+
+	if (STREQ(func, "do_entInt")) 
+		return SW_64_EXCEPTION_FRAME;
+
+	if (STREQ(func, "do_entArith")) 
+                return SW_64_EXCEPTION_FRAME;
+
+        if (STREQ(func, "do_entIF")) 
+                return SW_64_EXCEPTION_FRAME;
+
+        if (STREQ(func, "do_entDbg")) 
+                return SW_64_EXCEPTION_FRAME;
+
+	if (STREQ(func, "handle_bottom_half"))
+                return SW_64_EXCEPTION_FRAME;
+
+	if (STREQ(func, "handle_softirq"))
+                return SW_64_EXCEPTION_FRAME;
+
+	if (STREQ(func, "reschedule"))
+		return SW_64_RESCHEDULE;
+
+	if (STREQ(func, "ret_from_reschedule")) 
+		return SW_64_RESCHEDULE;
+
+	if (STREQ(func, "signal_return"))
+		return SW_64_SIGNAL_RETURN;
+
+	if (STREQ(func, "strace"))
+		return SW_64_STRACE;
+
+        if (STREQ(func, "__down_failed") ||
+            STREQ(func, "__down_failed_interruptible")) {
+		readmem(req->sp + 144, KVADDR, &req->pc, sizeof(ulong),
+			"__down_failed r26", FAULT_ON_ERROR);
+		req->sp += 160;
+                return SW_64_DOWN_FAILED;
+	}
+
+	value = GET_STACK_ULONG(frame);
+
+	if (STREQ(closest_symbol(value), "do_entInt") ||
+	    STREQ(closest_symbol(value), "do_entArith") ||
+	    STREQ(closest_symbol(value), "do_entIF") ||
+	    STREQ(closest_symbol(value), "do_entDbg")) {
+		req->addr = value;
+		req->frame = 0;
+
+		while (INSTACK(frame, bt)) {
+			frame += sizeof(ulong);
+			value = GET_STACK_ULONG(frame);
+			if (STREQ(closest_symbol(value), "ret_from_sys_call")) {
+				sw_64_frame_offset(req, req->addr);
+				/* req->frame = frame + req->value; XXX */
+				break;
+			}
+		}
+		return SW_64_INTERRUPT_PENDING;
+	}
+
+	return SW_64_CONTINUE_TRACE;
+}
+
+/*
+ *  Redo the gdb pt_regs structure output.
+ */
+enum regnames { _r0_, _r1_, _r2_, _r3_, _r4_, _r5_, _r6_, _r7_, _r8_, 
+		_r19_, _r20_, _r21_, _r22_, _r23_, _r24_, _r25_, _r26_, 
+		_r27_, _r28_, _hae_, _trap_a0_, _trap_a1_, _trap_a2_, 
+        	_ps_, _pc_, _gp_, _r16_, _r17_, _r18_, NUMREGS};
+
+struct sw_64_eframe {
+	char regs[30][30];
+	ulong value[29];
+};
+
+static void
+sw_64_exception_frame(ulong addr, 
+	              ulong flags, 
+		      struct gnu_request *req,
+		      struct bt_info *bt)
+{
+	int i, j;
+	char buf[BUFSIZE];
+	ulong value; 
+	physaddr_t paddr;
+	struct sw_64_eframe eframe;
+
+	if (CRASHDEBUG(4))
+		fprintf(fp, "sw_64_exception_frame: %lx\n", addr);
+
+	if (flags & BT_SPECULATE) {
+		req->pc = 0;
+		fprintf(fp, "SW_64 EXCEPTION FRAME\n");
+		return;
+	}
+
+	BZERO(&eframe, sizeof(struct sw_64_eframe));
+
+        open_tmpfile();
+	dump_struct("pt_regs", addr, RADIX(16));
+        rewind(pc->tmpfile);
+        while (fgets(buf, BUFSIZE, pc->tmpfile)) {
+		strip_comma(clean_line(buf));
+		if (!strstr(buf, "0x"))
+			continue;
+
+		extract_hex(buf, &value, NULLCHAR, TRUE);
+		if (CRASHDEBUG(4))
+			fprintf(pc->saved_fp, "<%s> %lx\n", buf, value);
+
+		if (STRNEQ(buf, "r0 = ")) {
+			sprintf(eframe.regs[_r0_], "  V0/R0: %016lx", value);
+			eframe.value[_r0_] = value;
+		}
+		if (STRNEQ(buf, "r1 = ")) {
+			sprintf(eframe.regs[_r1_], "  T0/R1: %016lx", value);
+			eframe.value[_r1_] = value;
+		}
+		if (STRNEQ(buf, "r2 = ")) {
+			sprintf(eframe.regs[_r2_], "  T1/R2: %016lx", value);
+			eframe.value[_r2_] = value;
+		}
+		if (STRNEQ(buf, "r3 = ")) {
+			sprintf(eframe.regs[_r3_], "  T2/R3: %016lx", value);
+			eframe.value[_r3_] = value;
+		}
+		if (STRNEQ(buf, "r4 = ")) {
+			sprintf(eframe.regs[_r4_], "  T3/R4: %016lx", value);
+			eframe.value[_r4_] = value;
+		}
+		if (STRNEQ(buf, "r5 = ")) {
+			sprintf(eframe.regs[_r5_], "  T4/R5: %016lx", value);
+			eframe.value[_r5_] = value;
+		}
+		if (STRNEQ(buf, "r6 = ")) {
+			sprintf(eframe.regs[_r6_], "  T5/R6: %016lx", value);
+			eframe.value[_r6_] = value;
+		}
+		if (STRNEQ(buf, "r7 = ")) {
+			sprintf(eframe.regs[_r7_], "  T6/R7: %016lx", value);
+			eframe.value[_r7_] = value;
+		}
+		if (STRNEQ(buf, "r8 = ")) {
+			sprintf(eframe.regs[_r8_], "  T7/R8: %016lx", value);
+			eframe.value[_r8_] = value;
+		}
+		if (STRNEQ(buf, "r19 = ")) {
+			sprintf(eframe.regs[_r19_], " A3/R19: %016lx", value);
+			eframe.value[_r19_] = value;
+		}
+		if (STRNEQ(buf, "r20 = ")) {
+			sprintf(eframe.regs[_r20_], " A4/R20: %016lx", value);
+			eframe.value[_r20_] = value;
+		}
+		if (STRNEQ(buf, "r21 = ")) {
+			sprintf(eframe.regs[_r21_], " A5/R21: %016lx", value);
+			eframe.value[_r21_] = value;
+		}
+		if (STRNEQ(buf, "r22 = ")) {
+			sprintf(eframe.regs[_r22_], " T8/R22: %016lx", value);
+			eframe.value[_r22_] = value;
+		}
+		if (STRNEQ(buf, "r23 = ")) {
+			sprintf(eframe.regs[_r23_], " T9/R23: %016lx", value);
+			eframe.value[_r23_] = value;
+		}
+		if (STRNEQ(buf, "r24 = ")) {
+			sprintf(eframe.regs[_r24_], "T10/R24: %016lx", value);
+			eframe.value[_r24_] = value;
+		}
+		if (STRNEQ(buf, "r25 = ")) {
+			sprintf(eframe.regs[_r25_], "T11/R25: %016lx", value);
+			eframe.value[_r25_] = value;
+		}
+		if (STRNEQ(buf, "r26 = ")) {
+			sprintf(eframe.regs[_r26_], " RA/R26: %016lx", value);
+			eframe.value[_r26_] = value;
+		}
+		if (STRNEQ(buf, "r27 = ")) {
+			sprintf(eframe.regs[_r27_], "T12/R27: %016lx", value);
+			eframe.value[_r27_] = value;
+		}
+		if (STRNEQ(buf, "r28 = ")) {
+			sprintf(eframe.regs[_r28_], " AT/R28: %016lx", value);
+			eframe.value[_r28_] = value;
+		}
+		if (STRNEQ(buf, "hae = ")) {
+			sprintf(eframe.regs[_hae_], "    HAE: %016lx", value);
+			eframe.value[_hae_] = value;
+		}
+		if (STRNEQ(buf, "trap_a0 = ")) {
+			sprintf(eframe.regs[_trap_a0_], "TRAP_A0: %016lx", 
+				value);
+			eframe.value[_trap_a0_] = value;
+		}
+		if (STRNEQ(buf, "trap_a1 = ")) {
+			sprintf(eframe.regs[_trap_a1_], "TRAP_A1: %016lx", 
+				value);
+			eframe.value[_trap_a1_] = value;
+		}
+		if (STRNEQ(buf, "trap_a2 = ")) {
+			sprintf(eframe.regs[_trap_a2_], "TRAP_A2: %016lx", 
+				value);
+			eframe.value[_trap_a2_] = value;
+		}
+		if (STRNEQ(buf, "ps = ")) {
+			sprintf(eframe.regs[_ps_], "     PS: %016lx", value);
+			eframe.value[_ps_] = value;
+		}
+		if (STRNEQ(buf, "pc = ")) {
+			sprintf(eframe.regs[_pc_], "     PC: %016lx", value);
+			eframe.value[_pc_] = value;
+		}
+		if (STRNEQ(buf, "gp = ")) {
+			sprintf(eframe.regs[_gp_], " GP/R29: %016lx", value);
+			eframe.value[_gp_] = value;
+		}
+		if (STRNEQ(buf, "r16 = ")) {
+			sprintf(eframe.regs[_r16_], " A0/R16: %016lx", value);
+			eframe.value[_r16_] = value;
+		}
+		if (STRNEQ(buf, "r17 = ")) {
+			sprintf(eframe.regs[_r17_], " A1/R17: %016lx", value);
+			eframe.value[_r17_] = value;
+		}
+		if (STRNEQ(buf, "r18 =")) {
+			sprintf(eframe.regs[_r18_], " A2/R18: %016lx", value);
+			eframe.value[_r18_] = value;
+		}
+	}
+        close_tmpfile();
+
+	if ((flags & BT_EXCEPTION_FRAME) && !BT_REFERENCE_CHECK(bt)) {
+dump_eframe:
+		fprintf(fp, " EFRAME: %lx  ", addr);
+		fprintf(fp, "%s\n", eframe.regs[_r24_]);
+
+		for (i = 0; i < (((NUMREGS+1)/2)-1); i++) {
+			fprintf(fp, "%s  ", eframe.regs[i]);
+			pad_line(fp, 21 - strlen(eframe.regs[i]), ' ');
+			j = i+((NUMREGS+1)/2);
+			fprintf(fp, "%s", eframe.regs[j]);
+			if (((j == _pc_) || (j == _r26_)) && 
+			    is_kernel_text(eframe.value[j]))
+				fprintf(fp, "  <%s>", 
+				    value_to_symstr(eframe.value[j], buf, 0));
+			fprintf(fp, "\n");
+		}
+	}
+
+	req->ra = eframe.value[_r26_];
+	req->pc = eframe.value[_pc_];
+	req->sp = addr + (29 * sizeof(ulong));
+
+	if (flags & BT_USER_EFRAME) {
+		flags &= ~BT_USER_EFRAME;
+		if (!BT_REFERENCE_CHECK(bt) && (eframe.value[_ps_] == 8) &&
+		    (((uvtop(task_to_context(req->task), req->pc, &paddr, 0) || 
+	             (volatile ulong)paddr) &&
+		    (uvtop(task_to_context(req->task), req->ra, &paddr, 0) ||
+		     (volatile ulong)paddr)) ||
+		     (IS_ZOMBIE(req->task) || IS_EXITING(req->task)))) {
+			if (!(flags & 
+			     (BT_RESCHEDULE|BT_RET_FROM_SMP_FORK|BT_STRACE)))
+				fprintf(fp, 
+				    "NOTE: kernel-entry exception frame:\n");
+			goto dump_eframe;
+		} 
+	}
+}
+
+/*
+ *   Look for likely exception frames in a stack.
+ */
+struct sw_64_pt_regs {
+	ulong reg_value[NUMREGS];
+};
+
+static int
+sw_64_eframe_search(struct bt_info *bt)
+{
+        ulong *first, *last;
+	ulong eframe;
+	struct sw_64_pt_regs *pt;
+	struct gnu_request *req;   /* needed for sw_64_exception_frame */
+	ulong *stack;
+	int cnt;
+
+	stack = (ulong *)bt->stackbuf;
+        req = (struct gnu_request *)GETBUF(sizeof(struct gnu_request));
+        req->task = bt->task;
+
+        first = stack +
+           (roundup(SIZE(task_struct), sizeof(ulong)) / sizeof(ulong));
+        last = stack +
+           (((bt->stacktop - bt->stackbase) - SIZE(pt_regs)) / sizeof(ulong));
+
+        for (cnt = 0; first <= last; first++) {
+		pt = (struct sw_64_pt_regs *)first;
+
+		/* check for kernel exception frame */
+
+		if (!(pt->reg_value[_ps_] & 0xfffffffffffffff8) &&
+		    (is_kernel_text(pt->reg_value[_pc_]) ||
+		     IS_MODULE_VADDR(pt->reg_value[_pc_])) &&
+		    (is_kernel_text(pt->reg_value[_r26_]) ||
+		     IS_MODULE_VADDR(pt->reg_value[_r26_])) &&
+                    IS_KVADDR(pt->reg_value[_gp_])) {
+			cnt++;
+			if (bt->flags & BT_EFRAME_COUNT) 
+				continue;
+			fprintf(fp, "\nKERNEL-MODE EXCEPTION FRAME:\n");
+			eframe = bt->task + ((ulong)first - (ulong)stack);
+			sw_64_exception_frame(eframe, BT_EXCEPTION_FRAME, 
+				req, bt);
+			continue;
+		}
+
+		/* check for user exception frame */
+
+                if ((pt->reg_value[_ps_] == 0x8) &&
+		    ((IN_TASK_VMA(bt->task, pt->reg_value[_pc_]) &&
+                    IN_TASK_VMA(bt->task, pt->reg_value[_r26_]) &&
+                    IS_UVADDR(pt->reg_value[_gp_], bt->tc)) ||
+		    ((first == last) && 
+			(IS_ZOMBIE(bt->task) || IS_EXITING(bt->task))))) {
+			cnt++;
+			if (bt->flags & BT_EFRAME_COUNT) 
+				continue;
+			fprintf(fp, "\nUSER-MODE EXCEPTION FRAME:\n");
+			eframe = bt->task + ((ulong)first - (ulong)stack);
+			sw_64_exception_frame(eframe, BT_EXCEPTION_FRAME, 
+				req, bt);
+		}
+        }
+
+	FREEBUF(req);
+
+	return cnt;
+}
+
+/*
+ *  Before dumping a nonsensical exception frame, give it a quick test.
+ */
+static int
+verify_user_eframe(struct bt_info *bt, ulong task, ulong sp)
+{
+	struct sw_64_pt_regs ptbuf, *pt;
+
+	readmem(sp, KVADDR, &ptbuf, sizeof(struct sw_64_pt_regs),
+		"pt_regs", FAULT_ON_ERROR);
+
+	pt = &ptbuf;
+
+        if ((pt->reg_value[_ps_] == 0x8) &&
+            ((IN_TASK_VMA(task, pt->reg_value[_pc_]) &&
+            IN_TASK_VMA(task, pt->reg_value[_r26_]) &&
+            IS_UVADDR(pt->reg_value[_gp_], bt->tc)) ||
+            ((pt == (struct sw_64_pt_regs *)USER_EFRAME_ADDR(task)) && 
+	    (IS_ZOMBIE(task) || IS_EXITING(task))))) {
+		return TRUE;
+        }
+
+	return FALSE;
+}
+
+/*
+ *  Try to resync the stack location when there is no valid stack frame,
+ *  typically just above an exception frame.  Use the req->ra value from the 
+ *  exception frame as the new starting req->pc.  Then walk up the stack until 
+ *  a text routine that calls the newly-assigned pc is found -- that stack 
+ *  location then becomes the new req->sp.  
+ *
+ *  If we're not coming from an exception frame, req-ra and req->pc will be 
+ *  purposely zeroed out.  In that case, use the prevsp value to find the 
+ *  first pc that called the last frame's pc.
+ *
+ *  Add any other repeatable "special-case" frames to the beginning of this 
+ *  routine (ex. debug_spin_lock).  Last ditch -- at the end of this routine, 
+ *  speculate what might have happened (possibly in the background) -- and 
+ *  if it looks good, run with it.
+ */
+static int
+sw_64_backtrace_resync(struct gnu_request *req, ulong flags, struct bt_info *bt)
+{
+	char addr[BUFSIZE];
+	char buf[BUFSIZE];
+	char lookfor1[BUFSIZE];
+	char lookfor2[BUFSIZE];
+	ulong newpc;
+	ulong *stkp; 
+	ulong *stkp_newpc, *stkp_next;
+	ulong value;
+	int found;
+	char *name;
+	int exception;
+
+	if (CRASHDEBUG(1))
+		fprintf(fp, 
+		    "RESYNC1: [%lx-%d] ra: %lx pc: %lx sp: %lx\n",
+                        flags, req->curframe, req->ra, req->pc, req->sp);
+
+	if (!req->ra && !req->pc) {
+		req->ra = req->prevpc;
+		exception = FALSE;
+	} else
+		exception = TRUE;
+
+	if (!IS_KVADDR(req->ra)) 
+		return FALSE;
+
+	name = closest_symbol(req->ra);
+	sprintf(lookfor1, "<%s>", name);
+	sprintf(lookfor2, "<%s+", name);
+
+        if (CRASHDEBUG(1))
+                fprintf(fp, "RESYNC2: exception: %s lookfor: %s or %s\n",
+                        exception ? "TRUE" : "FALSE",
+			lookfor1, lookfor2);
+
+	/*
+	 *  This is common when a non-panicking active CPU is spinning
+         *  in debug_spin_lock().  The next pc is offset by 0x30 from
+         *  the top of the exception frame, and the next sp is equal
+	 *  to the frame offset of debug_spin_lock().  I can't explain it...
+	 */ 
+	if ((flags & BT_FROM_EXCEPTION) && STREQ(name, "debug_spin_lock")) {
+		sw_64_print_stack_entry(req, req->ra, 
+			closest_symbol(req->ra), flags, bt);
+
+		if (BT_REFERENCE_FOUND(bt)) 
+			return FALSE;
+		
+		sw_64_frame_offset(req, req->ra);
+		stkp = (ulong *)(req->sp + 0x30);
+		value = GET_STACK_ULONG(stkp);
+		if (!is_kernel_text(value)) {
+			req->sp = req->prevsp;
+			return FALSE;
+		}
+		req->pc = value;
+		req->sp += req->value;
+		return TRUE;
+	}
+
+	/*
+	 *  If the ra is a system call, then all we should have to do is
+	 *  find the next reference to entSys on the stack, and set the
+	 *  sp to that value.
+	 */
+        if (is_system_call(name, 0)) {
+		/* stkp = (ulong *)req->sp; */
+		stkp = (ulong *)req->prevsp;
+
+        	for (stkp++; INSTACK(stkp, bt); stkp++) {
+			value = GET_STACK_ULONG(stkp);
+
+			if (IS_KVADDR(value) && is_kernel_text(value)) {
+				if (STREQ(closest_symbol(value), "entSys")) {
+					req->pc = value;
+					req->sp = USER_EFRAME_ADDR(req->task);
+					return TRUE;
+				}
+			}
+		}
+	}
+
+	/*
+	 *  Just find the next location containing text. (?)
+	 */
+        if (STREQ(name, "do_coredump")) {
+                stkp = (ulong *)(req->sp + sizeof(long));
+                for (stkp++; INSTACK(stkp, bt); stkp++) {
+			value = GET_STACK_ULONG(stkp);
+
+                        if (IS_KVADDR(value) && is_kernel_text(value)) {
+                                req->pc = req->ra;
+                                req->sp = (ulong)stkp;
+                                return TRUE;
+                        }
+                }
+	}
+
+	if (flags & BT_SPECULATE)
+		return FALSE;
+
+	if (CRASHDEBUG(1)) {
+		fprintf(fp, "RESYNC3: prevsp: %lx  ra: %lx name: %s\n", 
+			req->prevsp, req->ra, name);
+		fprintf(fp, "RESYNC3: prevpc: %lx\n", req->prevpc); 
+	}
+
+	stkp_newpc = stkp_next = 0;
+	newpc = 0;
+	found = FALSE;
+	if (exception) {
+		newpc = req->ra;
+		stkp = (ulong *)req->sp;
+	} else 
+		stkp = (ulong *)req->prevsp;
+
+	if (CRASHDEBUG(1))
+		fprintf(fp, "RESYNC4: stkp: %lx  newpc: %lx\n",
+			(ulong)stkp, newpc);
+
+	for (stkp++; INSTACK(stkp, bt); stkp++) {
+		value = GET_STACK_ULONG(stkp);
+		/*
+		 *  First find the new pc on the stack.
+		 */
+		if (!found) {
+			if (!exception && is_kernel_text(value)) {
+				found = TRUE;
+			} else if (value == newpc) {
+				found = TRUE;
+				stkp_newpc = stkp;
+				continue;
+			}
+		}
+
+		if (!IS_KVADDR(value))
+			continue;
+
+		if (is_kernel_text(value)) {
+			if (!stkp_next)
+				stkp_next = stkp;
+			if (CRASHDEBUG(2)) {
+				fprintf(fp, 
+				    "RESYNC6: disassemble %lx (%s)\n",
+					value - sizeof(uint),
+					value_to_symstr(value - sizeof(uint),
+					buf, 0));
+			}
+			req->command = GNU_DISASSEMBLE;
+			req->addr = value - sizeof(uint);
+			sprintf(addr, "0x%lx", req->addr);
+			open_tmpfile();
+			req->fp = pc->tmpfile;
+			gdb_interface(req);
+			rewind(pc->tmpfile);
+			while (fgets(buf, BUFSIZE, pc->tmpfile)) {
+				clean_line(buf);
+                                if (STRNEQ(buf, "Dump of") ||
+                                    STRNEQ(buf, "End of"))
+                                        continue;
+
+                                if (STRNEQ(buf, addr)) {
+					if (LASTCHAR(buf) == ':') {
+						fgets(buf, BUFSIZE, 
+							pc->tmpfile);
+						clean_line(buf);
+					}
+					if (CRASHDEBUG(2) && 
+					    (strstr(buf, "jsr") 
+					    || strstr(buf, "bsr"))) 
+						fprintf(pc->saved_fp, "%s\n",
+							buf);
+					if ((strstr(buf, "jsr") ||
+					     strstr(buf, "bsr")) &&
+					    (strstr(buf, lookfor1) ||
+					     strstr(buf, lookfor2))) {
+						if (exception) {
+							req->pc = newpc;
+							req->sp = (ulong)stkp;
+						} else 
+							req->pc = req->addr;
+						close_tmpfile();
+						return TRUE;
+					}
+				}
+			}
+			close_tmpfile();
+		}
+	}
+
+	if (CRASHDEBUG(1)) {
+		fprintf(fp, "RESYNC9: [%d] name: %s pc: %lx ra: %lx\n",
+			req->curframe, name, req->pc, req->ra);
+		fprintf(fp, "RESYNC9: sp: %lx lastsp: %lx\n",
+			req->sp, req->lastsp);
+		fprintf(fp, "RESYNC9: prevpc: %lx prevsp: %lx\n",
+			req->prevpc, req->prevsp);
+	}
+
+	/*
+	 *  At this point, all we can do is speculate based upon 
+	 *  past experiences...
+	 */
+	return (sw_64_resync_speculate(req, flags, bt));
+}
+
+/*
+ *  Try one level of speculation.  If it works, fine -- if not, give up.
+ */
+static int
+sw_64_resync_speculate(struct gnu_request *req, ulong flags, struct bt_info *bt)
+{
+	ulong *stkp;
+	ulong value;
+	ulong found_sp, found_ra;
+        struct stack_hook hook;
+	struct bt_info bt_info, *btloc;
+	char buf[BUFSIZE];
+	int kernel_thread;
+	int looks_good;
+
+	if (flags & BT_SPECULATE)   /* already been here on this trace... */
+		return FALSE;
+
+	if (pc->tmpfile)
+		return FALSE;
+
+        found_ra = found_sp = 0;
+	kernel_thread = is_kernel_thread(req->task);
+
+	/*
+	 *  Add "known" possibilities here.
+	 */
+	switch (flags & (BT_FROM_EXCEPTION|BT_FROM_CALLFRAME))
+	{
+	case BT_FROM_EXCEPTION:
+        	if (STREQ(closest_symbol(req->prevpc), "read_lock") ||
+                    STREQ(closest_symbol(req->ra), "do_select") ||
+                    STREQ(closest_symbol(req->ra), "schedule")) {
+			stkp = (ulong *)req->sp;
+			for (stkp++; INSTACK(stkp, bt); stkp++) {
+				value = GET_STACK_ULONG(stkp);
+	
+				if (found_ra) {
+					if (is_kernel_text_offset(value)) {
+						found_sp = (ulong)stkp;
+						break;
+					}
+					continue;
+				}
+	
+				if (value == req->ra) 
+					found_ra = value; 
+			}
+		}
+		break;
+
+	case BT_FROM_CALLFRAME:
+                if (STREQ(closest_symbol(req->ra), "sys_read")) {
+			value = GET_STACK_ULONG(req->prevsp - 32);
+                        if (STREQ(closest_symbol(value), "entSys")) {
+                                found_ra = value;
+                                found_sp = req->prevsp - 32;
+                        }
+                } else if (STREQ(closest_symbol(req->ra), "exit_autofs4_fs")) {
+                        stkp = (ulong *)req->sp;
+                        for (stkp++; INSTACK(stkp, bt); stkp++) {
+				value = GET_STACK_ULONG(stkp);
+
+                                if (found_ra && (value != found_ra)) {
+                                        if (is_kernel_text_offset(value)) {
+                                                found_sp = (ulong)stkp;
+                                                break;
+                                        }
+                                        continue;
+                                }
+
+				if (is_kernel_text_offset(value)) 
+					found_ra = value;
+                        }
+		}
+
+		break;
+
+	default:
+		if (req->hookp &&
+		    STREQ(closest_symbol(req->prevpc), "filemap_nopage") &&
+	            !STREQ(closest_symbol(req->hookp->eip), "do_no_page")) {
+			found_ra = found_sp = 0;
+			stkp = (ulong *)req->prevsp;
+                        for (stkp++; INSTACK(stkp, bt); stkp++) {
+				value = GET_STACK_ULONG(stkp);
+
+                                if (found_ra && (value != found_ra)) {
+                                        if (is_kernel_text_offset(value)) {
+                                                found_sp = (ulong)stkp;
+                                                break;
+                                        }
+                                        continue;
+                                }
+
+                                if (is_kernel_text_offset(value) &&
+				    STREQ(closest_symbol(value), "do_no_page")) 
+                                        found_ra = value;
+                        }
+			if (found_ra && found_sp) {
+                        	req->hookp->eip = found_ra;
+                        	req->hookp->esp = found_sp;
+				return TRUE;
+			}
+		}
+		
+                if (req->hookp) {
+                        found_ra = req->hookp->eip;
+                        found_sp = req->hookp->esp;
+                }
+
+		break;
+	}
+
+	if (found_ra && found_sp) {
+		looks_good = FALSE;
+		hook.esp = found_sp;
+		hook.eip = found_ra;
+
+		if (CRASHDEBUG(1))
+			fprintf(pc->saved_fp, 
+			    "----- RESYNC SPECULATE START -----\n");
+
+		open_tmpfile();
+		btloc = &bt_info;
+		BZERO(btloc, sizeof(struct bt_info));
+		btloc->task = req->task;
+		btloc->tc = bt->tc;
+		btloc->stackbase = bt->stackbase;
+		btloc->stacktop = bt->stacktop;
+		btloc->flags = BT_SPECULATE;
+		btloc->hp = &hook;
+        	back_trace(btloc);
+        	rewind(pc->tmpfile);
+        	while (fgets(buf, BUFSIZE, pc->tmpfile)) {
+			if (CRASHDEBUG(1))
+				fprintf(pc->saved_fp, "%s", buf);
+
+                        if (strstr(buf, "NOTE: cannot resolve")) {
+                                looks_good = FALSE;
+                                break;
+                        }
+
+			if (strstr(buf, "SW_64 EXCEPTION FRAME")) {
+				looks_good = TRUE;
+				break;
+			}
+
+			if (kernel_thread) {
+				if (strstr(buf, " kernel_thread ") ||
+				    strstr(buf, " __kernel_thread ") ||
+				    strstr(buf, " start_kernel ") ||
+				    strstr(buf, " smp_callin ")) {
+					looks_good = TRUE;
+					break;
+				}
+			}
+		}
+		close_tmpfile();
+
+		if (CRASHDEBUG(1))
+			fprintf(pc->saved_fp, 
+			    "----- RESYNC SPECULATE DONE ------\n");
+
+		if (looks_good) {
+                	req->pc = found_ra;
+                	req->sp = found_sp;
+			return TRUE;
+		}
+	}
+
+	return FALSE;
+}
+
+/*
+ *  Translates a user virtual address to its physical address.  cmd_vtop()
+ *  sets the verbose flag so that the pte translation gets displayed; all
+ *  other callers quietly accept the translation.
+ *
+ *  This routine can also take mapped kernel virtual addresses if the -u flag
+ *  was passed to cmd_vtop().  If so, it makes the translation using the
+ *  kernel-memory PGD entry instead of swapper_pg_dir.
+ */
+
+static int
+sw_64_uvtop(struct task_context *tc, ulong vaddr, physaddr_t *paddr, int verbose)
+{
+	ulong mm;
+	ulong *pgd;
+	ulong *page_dir;
+	ulong *page_middle;
+	ulong *page_table;
+	ulong pgd_pte;
+	ulong pmd_pte;
+	ulong pte;
+
+        if (!tc)
+                error(FATAL, "current context invalid\n");
+
+	*paddr = 0;
+
+        if (is_kernel_thread(tc->task) && IS_KVADDR(vaddr)) {
+		pgd = (ulong *)machdep->get_task_pgd(tc->task);
+	} else {
+		if (!tc->mm_struct)
+			pgd = (ulong *)machdep->get_task_pgd(tc->task);
+		else {
+                	if ((mm = task_mm(tc->task, TRUE)))
+                        	pgd = ULONG_PTR(tt->mm_struct +
+                                	OFFSET(mm_struct_pgd));
+			else
+				readmem(tc->mm_struct + OFFSET(mm_struct_pgd), 
+					KVADDR, &pgd, sizeof(long), 
+					"mm_struct pgd", FAULT_ON_ERROR);
+		}
+	}
+
+	if (verbose) 
+		fprintf(fp, "PAGE DIRECTORY: %lx\n", (ulong)pgd);
+
+	page_dir = pgd + ((vaddr >> PGDIR_SHIFT) & (PTRS_PER_PAGE - 1));
+
+	FILL_PGD(PAGEBASE(pgd), KVADDR, PAGESIZE());
+	pgd_pte = ULONG(machdep->pgd + PAGEOFFSET(page_dir));
+
+	if (verbose)
+		fprintf(fp, "  PGD: %lx => %lx\n", (ulong)page_dir, pgd_pte);
+
+	if (!(pgd_pte & _PAGE_VALID))
+		goto no_upage;
+
+	page_middle = (ulong *)
+		(PTOV((pgd_pte & _PFN_MASK) >> (32-PAGESHIFT()))) + 
+	  	((vaddr >> PMD_SHIFT) & (PTRS_PER_PAGE - 1));
+
+	FILL_PMD(PAGEBASE(page_middle), KVADDR, PAGESIZE());
+	pmd_pte = ULONG(machdep->pmd + PAGEOFFSET(page_middle));
+
+	if (verbose)
+		fprintf(fp, "  PMD: %lx => %lx\n", (ulong)page_middle, pmd_pte);
+
+	if (!(pmd_pte & _PAGE_VALID))
+		goto no_upage;
+
+	page_table = (ulong *)
+		(PTOV((pmd_pte & _PFN_MASK) >> (32-PAGESHIFT()))) +
+     		(BTOP(vaddr) & (PTRS_PER_PAGE - 1));
+	
+	FILL_PTBL(PAGEBASE(page_table), KVADDR, PAGESIZE());
+	pte = ULONG(machdep->ptbl + PAGEOFFSET(page_table));
+
+        if (verbose) 
+                fprintf(fp, "  PTE: %lx => %lx\n", (ulong)page_table, pte);
+
+	if (!(pte & (_PAGE_VALID))) {
+		*paddr = pte;
+		if (pte && verbose) {
+			fprintf(fp, "\n");
+			sw_64_translate_pte(pte, 0, 0);
+		}
+		goto no_upage;
+	}
+
+	*paddr = ((pte & _PFN_MASK) >> (32-PAGESHIFT())) + PAGEOFFSET(vaddr);
+
+        if (verbose) {
+                fprintf(fp, " PAGE: %lx\n\n", PAGEBASE(*paddr));
+		sw_64_translate_pte(pte, 0, 0);
+	}
+
+	return TRUE;
+
+no_upage:
+	return FALSE;
+}
+
+/*
+ *  Translates a kernel virtual address to its physical address.  cmd_vtop()
+ *  sets the verbose flag so that the pte translation gets displayed; all
+ *  other callers quietly accept the translation.
+ */
+
+static int
+sw_64_kvtop(struct task_context *tc, ulong kvaddr, physaddr_t *paddr, int verbose)
+{
+	ulong *pgd;
+	ulong *page_dir;
+	ulong *page_middle;
+	ulong *page_table;
+        ulong pgd_pte;
+        ulong pmd_pte;
+        ulong pte;
+
+	if (!IS_KVADDR(kvaddr))
+		return FALSE;
+
+	if (!vt->vmalloc_start) {         /* presume KSEG this early */
+		*paddr = VTOP(kvaddr);
+		return TRUE;
+	}
+
+	if (!IS_VMALLOC_ADDR(kvaddr)) { 
+		*paddr = VTOP(kvaddr);
+		return TRUE;
+	}
+
+	pgd = (ulong *)vt->kernel_pgd[0];
+
+	if (verbose) 
+		fprintf(fp, "PAGE DIRECTORY: %lx\n", (ulong)pgd);
+
+	page_dir = pgd + ((kvaddr >> PGDIR_SHIFT) & (PTRS_PER_PAGE - 1));
+
+        FILL_PGD(PAGEBASE(pgd), KVADDR, PAGESIZE());
+        pgd_pte = ULONG(machdep->pgd + PAGEOFFSET(page_dir));
+
+	if (verbose)
+		fprintf(fp, "  PGD: %lx => %lx\n", (ulong)page_dir, pgd_pte);
+
+	if (!(pgd_pte & _PAGE_VALID))
+		goto no_kpage;
+
+	page_middle = (ulong *)
+		(PTOV((pgd_pte & _PFN_MASK) >> (32-PAGESHIFT()))) + 
+	  	((kvaddr >> PMD_SHIFT) & (PTRS_PER_PAGE - 1));
+
+        FILL_PMD(PAGEBASE(page_middle), KVADDR, PAGESIZE());
+        pmd_pte = ULONG(machdep->pmd + PAGEOFFSET(page_middle));
+
+	if (verbose)
+		fprintf(fp, "  PMD: %lx => %lx\n", (ulong)page_middle, pmd_pte);
+
+	if (!(pmd_pte & _PAGE_VALID))
+		goto no_kpage;
+
+	page_table = (ulong *)
+		(PTOV((pmd_pte & _PFN_MASK) >> (32-PAGESHIFT()))) +
+     		(BTOP(kvaddr) & (PTRS_PER_PAGE - 1));
+	
+        FILL_PTBL(PAGEBASE(page_table), KVADDR, PAGESIZE());
+        pte = ULONG(machdep->ptbl + PAGEOFFSET(page_table));
+
+        if (verbose) 
+                fprintf(fp, "  PTE: %lx => %lx\n", (ulong)page_table, pte);
+
+	if (!(pte & (_PAGE_VALID))) {
+		if (pte && verbose) {
+			fprintf(fp, "\n");
+			sw_64_translate_pte(pte, 0, 0);
+		}
+		goto no_kpage;
+	}
+
+	*paddr = ((pte & _PFN_MASK) >> (32-PAGESHIFT())) + PAGEOFFSET(kvaddr);
+
+        if (verbose) {
+                fprintf(fp, " PAGE: %lx\n\n", PAGEBASE(*paddr));
+		sw_64_translate_pte(pte, 0, 0);
+	}
+
+	return TRUE;
+
+no_kpage:
+	return FALSE;
+}
+
+
+/*
+ *  Get the relevant page directory pointer from a task structure.
+ */
+static ulong
+sw_64_get_task_pgd(ulong task)
+{
+	long offset;
+	ulong ptbr;
+
+	offset = OFFSET_OPTION(task_struct_thread, task_struct_tss);
+
+	offset += OFFSET(thread_struct_ptbr);
+
+        readmem(task + offset, KVADDR, &ptbr,
+                sizeof(ulong), "task thread ptbr", FAULT_ON_ERROR);
+
+	return(PTOV(PTOB(ptbr)));
+}
+
+/*
+ *  Calculate and return the speed of the processor.
+ */
+static ulong
+sw_64_processor_speed(void)
+{
+	ulong hwrpb;
+	long offset;
+	long cycle_freq;
+	ulong mhz;
+
+	if (machdep->mhz)
+		return machdep->mhz;
+
+	mhz = 0;
+
+	get_symbol_data("hwrpb", sizeof(void *), &hwrpb);
+	offset = OFFSET(hwrpb_struct_cycle_freq);
+
+	if (!hwrpb || (offset == -1) || 
+	    !readmem(hwrpb+offset, KVADDR, &cycle_freq,
+            sizeof(ulong), "hwrpb cycle_freq", RETURN_ON_ERROR))
+		return (machdep->mhz = mhz);
+
+	mhz = cycle_freq/1000000;
+
+	return (machdep->mhz = mhz);
+}
+
+void
+sw_64_dump_machdep_table(ulong arg)
+{
+	int others;
+
+	others = 0;
+	fprintf(fp, "              flags: %lx (", machdep->flags);
+        if (machdep->flags & HWRESET)
+                fprintf(fp, "%sHWRESET", others++ ? "|" : "");
+        fprintf(fp, ")\n");
+	fprintf(fp, "             kvbase: %lx\n", machdep->kvbase);
+	fprintf(fp, "  identity_map_base: %lx\n", machdep->identity_map_base);
+        fprintf(fp, "           pagesize: %d\n", machdep->pagesize);
+        fprintf(fp, "          pageshift: %d\n", machdep->pageshift);
+        fprintf(fp, "           pagemask: %llx\n", machdep->pagemask);
+        fprintf(fp, "         pageoffset: %lx\n", machdep->pageoffset);
+	fprintf(fp, "          stacksize: %ld\n", machdep->stacksize);
+	fprintf(fp, "                 hz: %d\n", machdep->hz);
+	fprintf(fp, "                mhz: %ld\n", machdep->mhz);
+        fprintf(fp, "            memsize: %ld (0x%lx)\n", 
+		machdep->memsize, machdep->memsize);
+	fprintf(fp, "               bits: %d\n", machdep->bits);
+	fprintf(fp, "            nr_irqs: %d\n", machdep->nr_irqs);
+        fprintf(fp, "      eframe_search: sw_64_eframe_search()\n");
+        fprintf(fp, "         back_trace: sw_64_back_trace_cmd()\n");
+        fprintf(fp, "    processor_speed: sw_64_processor_speed()\n");
+        fprintf(fp, "              uvtop: sw_64_uvtop()\n");
+        fprintf(fp, "              kvtop: sw_64_uvtop()\n");
+        fprintf(fp, "       get_task_pgd: sw_64_get_task_pgd()\n");
+	if (machdep->dump_irq == generic_dump_irq)
+		fprintf(fp, "           dump_irq: generic_dump_irq()\n");
+	else
+		fprintf(fp, "           dump_irq: sw_64_dump_irq()\n");
+	fprintf(fp, "    get_stack_frame: sw_64_get_stack_frame()\n");
+	fprintf(fp, "      get_stackbase: generic_get_stackbase()\n");
+	fprintf(fp, "       get_stacktop: generic_get_stacktop()\n");
+        fprintf(fp, "      translate_pte: sw_64_translate_pte()\n");
+	fprintf(fp, "        memory_size: sw_64_get_memory_size()\n");
+	fprintf(fp, "      vmalloc_start: sw_64_get_vmalloc_start()\n");
+	fprintf(fp, "       is_task_addr: sw_64_is_task_addr()\n");
+	fprintf(fp, "      verify_symbol: sw_64_verify_symbol()\n");
+	fprintf(fp, "         dis_filter: sw_64_dis_filter()\n");
+	fprintf(fp, "           cmd_mach: sw_64_cmd_mach()\n");
+	fprintf(fp, "       get_smp_cpus: sw_64_get_smp_cpus()\n");
+        fprintf(fp, "          is_kvaddr: generic_is_kvaddr()\n");
+        fprintf(fp, "          is_uvaddr: generic_is_uvaddr()\n");
+        fprintf(fp, "       verify_paddr: generic_verify_paddr()\n");
+	fprintf(fp, "    init_kernel_pgd: NULL\n");
+	fprintf(fp, "    value_to_symbol: generic_machdep_value_to_symbol()\n");
+	fprintf(fp, "  line_number_hooks: sw_64_line_number_hooks\n");
+        fprintf(fp, "      last_pgd_read: %lx\n", machdep->last_pgd_read);
+        fprintf(fp, "      last_pmd_read: %lx\n", machdep->last_pmd_read);
+        fprintf(fp, "     last_ptbl_read: %lx\n", machdep->last_ptbl_read);
+        fprintf(fp, "                pgd: %lx\n", (ulong)machdep->pgd);
+        fprintf(fp, "                pmd: %lx\n", (ulong)machdep->pmd);
+        fprintf(fp, "               ptbl: %lx\n", (ulong)machdep->ptbl);
+	fprintf(fp, "       ptrs_per_pgd: %d\n", machdep->ptrs_per_pgd);
+        fprintf(fp, "           machspec: %lx\n", (ulong)machdep->machspec);
+}
+
+/*
+ *  Fix up jsr's to show the right target.
+ *
+ *  If a value is passed with no buf, then cmd_dis is fishing for whether
+ *  the GP can be calculated from the first couple of instructions of the
+ *  target routine:
+ *
+ *    0xfffffc0000349fa0 <sys_read>:  	      ldah    gp,35(t12)
+ *    0xfffffc0000349fa4 <sys_read+4>:        lda     gp,6216(gp)
+ *
+ *  If a buf pointer is passed, then check whether the t12 register
+ *  is being set up as an offset from gp, then calculate the target address:
+ *
+ *    0xfffffc000042c364 <start_tty+228>:     ldq     t12,-29336(gp)
+ *    0xfffffc000042c368 <start_tty+232>:     
+ *       jsr ra,(t12),0xfffffc0000429dc0 <decr_console+96>
+ * 
+ *  If the next instruction is a jsr ra,(t12), then correct the bracketed 
+ *  target address translation.
+ *  
+ */
+
+#define LDAH_GP_T12  (0x27bb0000)
+#define LDA_GP_GP    (0x23bd0000)
+#define LDQ_T12_GP   (0xa77d0000)   
+#define JSR_RA_T12   (0x6b5b0000)
+
+#define OPCODE_OPERAND_MASK  (0xffff0000)
+#define OPCODE_MEM_DISP_MASK (0x0000ffff)
+
+static struct instruction_data {
+	uint inst[2];
+	short mem_disp[2];
+	ulong gp;
+	ulong target;
+	char *curfunc;
+} instruction_data = { {0} };
+
+static int
+sw_64_dis_filter(ulong vaddr, char *buf, unsigned int output_radix)
+{
+	struct syment *sp;
+	struct instruction_data *id;
+	char buf2[BUFSIZE], *p1;
+
+	id = &instruction_data;
+
+	if (!buf) {
+		BZERO(id, sizeof(struct instruction_data));
+
+		if (!(sp = value_search(vaddr, NULL)))   
+			return FALSE;
+
+		readmem(sp->value, KVADDR, &id->inst[0], 
+			sizeof(uint) * 2, "two instructions", FAULT_ON_ERROR);
+
+		if (((id->inst[0] & OPCODE_OPERAND_MASK) == LDAH_GP_T12) &&
+		    ((id->inst[1] & OPCODE_OPERAND_MASK) == LDA_GP_GP)) {
+			id->mem_disp[0] = (short)(id->inst[0] & 
+				OPCODE_MEM_DISP_MASK);
+			id->mem_disp[1] = (short)(id->inst[1] & 
+				OPCODE_MEM_DISP_MASK);
+			id->gp = sp->value + (65536*id->mem_disp[0]) +
+				id->mem_disp[1];
+			id->curfunc = sp->name;
+
+			if (CRASHDEBUG(1))
+                            console("%s: ldah(%d) and lda(%d) gp: %lx\n",
+                                id->curfunc,
+                                id->mem_disp[0], id->mem_disp[1],
+                                id->gp);
+
+			return TRUE;
+		} 
+                               /* send all lines through the generic */
+		return TRUE;   /* dis_address_translation() filter */
+	}
+
+	dis_address_translation(vaddr, buf, output_radix);
+
+	if (!id->gp || !(sp = value_search(vaddr, NULL)) || 
+	    !STREQ(id->curfunc, sp->name)) {
+		BZERO(id, sizeof(struct instruction_data));
+		return FALSE;
+	}
+
+        readmem(vaddr, KVADDR, &id->inst[0],
+        	sizeof(uint), "one instruction", FAULT_ON_ERROR);
+        
+	if ((id->inst[0] & OPCODE_OPERAND_MASK) == JSR_RA_T12) {
+
+		if (!id->target || !strstr(buf, "jsr\tra,(t12)") ||
+		    !strstr(buf, "<"))
+			return FALSE;
+
+		p1 = strstr(strstr(buf, "jsr"), "0x");
+		sprintf(p1, "0x%lx <%s>%s", 
+			id->target,
+			value_to_symstr(id->target, buf2, output_radix),
+			CRASHDEBUG(1) ? "  [PATCHED]\n" : "\n");
+		return TRUE;
+	}
+
+	if ((id->inst[0] & OPCODE_OPERAND_MASK) == LDQ_T12_GP) {
+		id->mem_disp[0] = (short)(id->inst[0] & OPCODE_MEM_DISP_MASK);
+        	readmem(id->gp + id->mem_disp[0], KVADDR, &id->target,
+                	sizeof(ulong), "jsr target", FAULT_ON_ERROR);
+	} else
+		id->target = 0;
+
+	return TRUE;
+}
+
+/*
+ *  For some reason gdb can go off into the weeds translating text addresses,
+ *  so this routine both fixes the references as well as imposing the current
+ *  output radix on the translations.
+ */
+static void
+dis_address_translation(ulong vaddr, char *inbuf, unsigned int output_radix)
+{
+	char buf1[BUFSIZE];
+	char buf2[BUFSIZE];
+	char *colon, *p1;
+	int argc;
+	char *argv[MAXARGS];
+	ulong value;
+
+	console("IN: %s", inbuf);
+
+	colon = strstr(inbuf, ":");
+
+	if (colon) {
+		sprintf(buf1, "0x%lx <%s>", vaddr,
+			value_to_symstr(vaddr, buf2, output_radix));
+		sprintf(buf2, "%s%s", buf1, colon);
+		strcpy(inbuf, buf2);
+	}
+
+	strcpy(buf1, inbuf);
+	argc = parse_line(buf1, argv);
+
+	if ((FIRSTCHAR(argv[argc-1]) == '<') && 
+	    (LASTCHAR(argv[argc-1]) == '>')) {
+		p1 = rindex(inbuf, '<');
+		while ((p1 > inbuf) && (*p1 != ',')) 
+			p1--;
+
+		if (!STRNEQ(p1, ",0x"))
+			return;
+		p1++;
+
+		if (!extract_hex(p1, &value, NULLCHAR, TRUE))
+			return;
+
+		sprintf(buf1, "0x%lx <%s>\n", value,	
+			value_to_symstr(value, buf2, output_radix));
+
+		sprintf(p1, "%s", buf1);
+	}
+
+	console("    %s", inbuf);
+}
+
+
+/*
+ *  If we're generically-inclined, call generic_dump_irq().  Otherwise
+ *  dump the IRQ table the old-fashioned way.
+ */
+static void
+sw_64_dump_irq(int irq)
+{
+	ulong action;
+	ulong value;
+        char *arglist[MAXARGS];
+	int argc, others;
+	char buf[BUFSIZE];
+
+	if (symbol_exists("irq_desc")) {
+		machdep->dump_irq = generic_dump_irq;
+		return(generic_dump_irq(irq));
+	}
+
+	action = symbol_value("irq_action") + (sizeof(void *) * irq);
+
+        readmem(action, KVADDR, &action,
+                sizeof(void *), "irq_action pointer", FAULT_ON_ERROR);
+
+	if (!action) {
+		fprintf(fp, "    IRQ: %d\n", irq);
+		fprintf(fp, "handler:\n"); 
+		fprintf(fp, "  flags: \n");
+		fprintf(fp, "   mask: \n");
+		fprintf(fp, "   name: \n");
+		fprintf(fp, " dev_id: \n");
+		fprintf(fp, "   next: \n\n");
+		return;	
+	}
+
+        fprintf(fp, "    IRQ: %d\n", irq);
+
+	open_tmpfile();
+
+do_linked_action:
+	dump_struct("irqaction", action, RADIX(16));
+	action = 0;
+        rewind(pc->tmpfile);
+        while (fgets(buf, BUFSIZE, pc->tmpfile)) {
+		strip_comma(buf);
+		argc = parse_line(buf, arglist);
+		if (STREQ(arglist[0], "struct") || STREQ(buf, "};"))
+			continue;
+
+                if (STREQ(arglist[0], "handler")) {
+                        fprintf(pc->saved_fp, "handler: %s  ",
+                        	strip_hex(arglist[2]));
+			if (argc == 4)
+                        	fprintf(pc->saved_fp, "%s", arglist[3]);
+			fprintf(pc->saved_fp, "\n");
+                }
+                if (STREQ(arglist[0], "flags")) {
+			value = htol(strip_comma(arglist[2]), 
+				FAULT_ON_ERROR, NULL);
+                        fprintf(pc->saved_fp, 
+				"  flags: %lx  ", value);
+				
+			if (value) {
+				others = 0;
+				fprintf(pc->saved_fp, "(");
+	
+				if (value & SA_INTERRUPT)
+					fprintf(pc->saved_fp,
+					    "%sSA_INTERRUPT",
+						others++ ? "|" : "");
+				if (value & SA_PROBE)
+                                        fprintf(pc->saved_fp,
+                                            "%sSA_PROBE",
+                                                others++ ? "|" : "");
+				if (value & SA_SAMPLE_RANDOM)
+                                         fprintf(pc->saved_fp,
+                                             "%sSA_SAMPLE_RANDOM",
+                                                 others++ ? "|" : "");
+				if (value & SA_SHIRQ)
+                                         fprintf(pc->saved_fp,
+                                             "%sSA_SHIRQ",
+                                                 others++ ? "|" : "");
+				fprintf(pc->saved_fp, ")");
+				if (value & ~ACTION_FLAGS) {
+					fprintf(pc->saved_fp,
+					    "  (bits %lx not translated)",
+						value & ~ACTION_FLAGS);
+				}
+			} 
+
+			fprintf(pc->saved_fp, "\n");
+
+		}
+                if (STREQ(arglist[0], "mask")) {
+			value = htol(strip_comma(arglist[2]), 
+				FAULT_ON_ERROR, NULL);
+                        fprintf(pc->saved_fp,
+                        	"   mask: %lx\n", value);
+		}
+		if (STREQ(arglist[0], "name")) {
+                        fprintf(pc->saved_fp, "   name: %s  ",
+                        	strip_hex(arglist[2]));
+			if (argc == 4)
+				fprintf(pc->saved_fp, "\"%s\"", arglist[3]);
+                        fprintf(pc->saved_fp, "\n");
+                }
+		if (STREQ(arglist[0], "dev_id")) {
+                        value = htol(strip_comma(arglist[2]), 
+				FAULT_ON_ERROR, NULL);
+                        fprintf(pc->saved_fp,
+                                " dev_id: %lx\n", value);
+                }
+		if (STREQ(arglist[0], "next")) {
+                        value = htol(strip_comma(arglist[2]), 
+				FAULT_ON_ERROR, NULL);
+                        fprintf(pc->saved_fp,
+                                "   next: %s\n",
+                                	strip_hex(arglist[2]));
+			if (value)
+				action = value;
+                }
+	}
+	close_tmpfile();
+
+	fprintf(fp, "\n");
+
+        if (action)
+                goto do_linked_action;
+}
+
+/*
+ *  Get a stack frame combination of pc and ra from the most relevent spot.
+ */
+static void
+sw_64_get_stack_frame(struct bt_info *bt, ulong *pcp, ulong *spp)
+{
+        struct syment *sp;
+        ulong ksp;
+	ulong ip;
+
+	if (pcp) {
+	        if (DUMPFILE() && is_panic_thread(bt->task)) {
+			sp = next_symbol("crash_save_current_state", NULL);	
+
+	                if (HWRESET_TASK(bt->task))
+	                        ip = get_percpu_data(0, GET_HALT_PC, 0);
+			else if (sp) 
+	                        ip = sp->value - 4;
+			else
+	                       	ip = symbol_value("crash_save_current_state") 
+					+ 16;
+	        } else 
+	        	get_sw_64_frame(bt, &ip, NULL);
+
+        	*pcp = ip;
+	}
+
+	if (spp) {
+		ip = 0;
+       		if (!get_panic_ksp(bt, &ksp))
+                	get_sw_64_frame(bt, 
+				HWRESET_TASK(bt->task) ? &ip : NULL, &ksp);
+
+        	if (!INSTACK(ksp, bt)) 
+                	error(FATAL, 
+			    "cannot determine starting stack address\n", 
+				bt->task);
+
+		*spp = ksp;
+		if (ip)
+			*pcp = ip;
+	}
+}
+
+/*
+ *  Do the work formerly done by sw_64_get_sp() and sw_64_get_pc().
+ */
+static void
+get_sw_64_frame(struct bt_info *bt, ulong *getpc, ulong *getsp)
+{
+	int i;
+	ulong ip;
+	ulong r26;
+	ulong ksp, sp;
+	ulong *spp;
+	ulong percpu_ra;
+	ulong percpu_pv;
+	struct percpu_data percpu_data;
+	char buf[BUFSIZE];
+	ulong task;
+	ulong *stack;
+
+	task = bt->task;
+	stack = (ulong *)bt->stackbuf;
+
+	if (tt->flags & THREAD_INFO) { /* pcb.ksp is 1st word in thread_info */
+		readmem(bt->tc->thread_info, KVADDR, &ksp, sizeof(ulong),
+                	"thread_info pcb ksp", FAULT_ON_ERROR);
+		sp = ksp;
+	} else if (VALID_MEMBER(task_struct_tss_ksp))
+                ksp = sp = stack[OFFSET(task_struct_tss_ksp)/sizeof(long)];
+	else 
+                ksp = sp = stack[OFFSET(task_struct_thread_ksp)/sizeof(long)];
+
+	ip = 0;
+	percpu_ra = percpu_pv = 0;
+	spp = &stack[(sp - task)/sizeof(long)];
+
+        if (DUMPFILE() && getsp) { 
+		if (HWRESET_TASK(task)) {
+			if (INSTACK(sp, bt)) {
+				*getsp = sp;
+				return;
+			} else {
+				get_percpu_data(0, 0, &percpu_data);
+				percpu_ra = percpu_data.halt_ra;
+				percpu_pv = percpu_data.halt_pv;
+				spp = &stack[roundup(SIZE(task_struct), 
+					sizeof(ulong)) / sizeof(ulong)];
+			}
+		}
+
+            	if (!percpu_ra && (STREQ(closest_symbol(*spp), "panic") ||
+                    STREQ(closest_symbol(*spp), "handle_ipi"))) {
+                	*getsp = sp;
+                	return;
+		}
+        }
+
+percpu_retry:
+
+	if (CRASHDEBUG(1) && percpu_ra) {
+		fprintf(fp, "get_sw_64_frame: look for %lx (%s)\n",
+			percpu_ra, value_to_symstr(percpu_ra, buf, 0));
+	}
+
+	for (i = 0, spp++; spp < &stack[LONGS_PER_STACK]; spp++,i++) {
+
+		if (CRASHDEBUG(1) && (percpu_ra || percpu_pv) && 
+		    is_kernel_text(*spp)) {
+			fprintf(fp, "%lx: %lx (%s)\n", 
+				((ulong)spp - (ulong)stack) + task,
+				*spp, value_to_symstr(*spp, buf, 0)); 
+		}
+
+                if (percpu_ra) {
+                        if (*spp == percpu_ra) {
+				*getsp = ((ulong)spp - (ulong)stack) + task;
+				return;
+			}
+                        continue;
+                } else if (percpu_pv) {
+                        if (*spp == percpu_pv) {
+                                *getsp = ((ulong)spp - (ulong)stack) + task;
+				if (getpc)
+					*getpc = percpu_pv;
+                                return;
+                        }
+                        continue;
+		}
+
+		if (!INSTACK(*spp, bt))
+			continue;
+
+		if (is_kernel_text(*(spp+1))) {
+			sp = *spp;
+			ip = *(spp+1);
+			break;
+		}
+	}
+
+	if (percpu_ra) {
+		percpu_ra = 0;
+
+		error(INFO,
+            "cannot find return address (percpu_ra) in HARDWARE RESET stack\n");
+		error(INFO,
+         "looking for procedure address (percpu_pv) in HARDWARE RESET stack\n");
+
+        	if (CRASHDEBUG(1)) {
+                	fprintf(fp, "get_sw_64_frame: look for %lx (%s)\n",
+                        	percpu_pv, value_to_symstr(percpu_pv, buf, 0));
+        	}
+		spp = &stack[roundup(SIZE(task_struct), 
+			sizeof(ulong)) / sizeof(ulong)];
+
+		goto percpu_retry;
+	}
+
+	if (percpu_pv) {
+		error(INFO,
+         "cannot find procedure address (percpu_pv) in HARDWARE RESET stack\n");
+	}
+
+	/*
+	 *  Check for a forked task that has not yet run in user space.
+	 */
+	if (!ip) {
+                if (INSTACK(ksp + OFFSET(switch_stack_r26), bt)) {
+                        readmem(ksp + OFFSET(switch_stack_r26), KVADDR, 
+				&r26, sizeof(ulong),
+                                "ret_from_smp_fork check", FAULT_ON_ERROR);
+                        if (STREQ(closest_symbol(r26), "ret_from_smp_fork") ||
+			    STREQ(closest_symbol(r26), "ret_from_smpfork")) {
+				ip = r26;
+				sp = ksp;
+			}
+		}
+
+	}
+
+	if (getsp)
+		*getsp = sp;
+	if (getpc)
+		*getpc = ip;
+
+}
+
+/*
+ *  Fill the percpu_data structure with information from the 
+ *  hwrpb/percpu_data structures for a given CPU.  If requested,
+ *  return one of the specified entries.
+ */
+static ulong
+get_percpu_data(int cpu, ulong flag, struct percpu_data *pd)
+{
+        ulong hwrpb, halt_ra, halt_PC, halt_pv;
+        unsigned long processor_offset, processor_size;
+
+        get_symbol_data("hwrpb", sizeof(void *), &hwrpb);
+
+        readmem(hwrpb+OFFSET(hwrpb_struct_processor_offset), KVADDR,
+                &processor_offset, sizeof(ulong),
+                "hwrpb processor_offset", FAULT_ON_ERROR);
+
+        readmem(hwrpb+OFFSET(hwrpb_struct_processor_size), KVADDR,
+                &processor_size, sizeof(ulong),
+                "hwrpb processor_size", FAULT_ON_ERROR);
+
+        readmem(hwrpb + processor_offset + (cpu * processor_size) +
+                OFFSET(percpu_struct_halt_PC),
+                KVADDR, &halt_PC, sizeof(ulong),
+                "percpu halt_PC", FAULT_ON_ERROR);
+
+        readmem(hwrpb + processor_offset + (cpu * processor_size) +
+                OFFSET(percpu_struct_halt_ra),
+                KVADDR, &halt_ra, sizeof(ulong),
+                "percpu halt_ra", FAULT_ON_ERROR);
+
+        readmem(hwrpb + processor_offset + (cpu * processor_size) +
+                OFFSET(percpu_struct_halt_pv),
+                KVADDR, &halt_pv, sizeof(ulong),
+                "percpu halt_pv", FAULT_ON_ERROR);
+
+	if (pd) {
+		pd->halt_PC = halt_PC;
+		pd->halt_ra = halt_ra;
+		pd->halt_pv = halt_pv;
+	}
+
+	switch (flag)
+	{
+	case GET_HALT_PC:
+		return halt_PC;
+		
+	case GET_HALT_RA:
+		return halt_ra;
+
+	case GET_HALT_PV:
+		return halt_pv;
+
+	default:
+		return 0;
+	}
+}
+
+/*
+ *  Translate a PTE, returning TRUE if the page is _PAGE_VALID or _PAGE_PRESENT,
+ *  whichever is appropriate for the machine type.  If a physaddr pointer is
+ *  passed in, don't print anything.
+ */
+static int
+sw_64_translate_pte(ulong pte, void *physaddr, ulonglong unused)
+{
+	int c, len1, len2, len3, others, page_present;
+	char buf[BUFSIZE];
+        char buf2[BUFSIZE];
+        char buf3[BUFSIZE];
+	char ptebuf[BUFSIZE];
+	char physbuf[BUFSIZE];
+        char *arglist[MAXARGS];
+	physaddr_t paddr;
+
+        paddr = PTOB(pte >> 32);
+	page_present = (pte & _PAGE_VALID);
+
+	if (physaddr) {
+		*((ulong *)physaddr) = paddr;
+		return page_present;
+	}
+
+	sprintf(ptebuf, "%lx", pte);
+	len1 = MAX(strlen(ptebuf), strlen("PTE"));
+	fprintf(fp, "%s  ", mkstring(buf, len1, CENTER|LJUST, "PTE"));
+
+        if (!page_present && pte) {
+                swap_location(pte, buf);
+                if ((c = parse_line(buf, arglist)) != 3)
+			error(FATAL, "cannot determine swap location\n");
+
+                len2 = MAX(strlen(arglist[0]), strlen("SWAP"));
+                len3 = MAX(strlen(arglist[2]), strlen("OFFSET"));
+
+                fprintf(fp, "%s  %s\n",
+                        mkstring(buf2, len2, CENTER|LJUST, "SWAP"),
+                        mkstring(buf3, len3, CENTER|LJUST, "OFFSET"));
+
+                strcpy(buf2, arglist[0]);
+                strcpy(buf3, arglist[2]);
+                fprintf(fp, "%s  %s  %s\n",
+                        mkstring(ptebuf, len1, CENTER|RJUST, NULL),
+                        mkstring(buf2, len2, CENTER|RJUST, NULL),
+                        mkstring(buf3, len3, CENTER|RJUST, NULL));
+
+                return page_present;
+        }
+
+	sprintf(physbuf, "%llx", paddr);
+	len2 = MAX(strlen(physbuf), strlen("PHYSICAL"));
+	fprintf(fp, "%s  ", mkstring(buf, len2, CENTER|LJUST, "PHYSICAL"));
+
+	fprintf(fp, "FLAGS\n");
+
+	fprintf(fp, "%s  %s  ",  
+		mkstring(ptebuf, len1, CENTER|RJUST, NULL),
+		mkstring(physbuf, len2, CENTER|RJUST, NULL)); 
+	fprintf(fp, "(");
+	others = 0;
+
+	if (pte) {
+		if (pte & _PAGE_VALID)
+			fprintf(fp, "%sVALID", others++ ? "|" : "");
+		if (pte & _PAGE_FOR)
+			fprintf(fp, "%sFOR", others++ ? "|" : "");
+		if (pte & _PAGE_FOW)
+			fprintf(fp, "%sFOW", others++ ? "|" : "");
+		if (pte & _PAGE_FOE)
+			fprintf(fp, "%sFOE", others++ ? "|" : "");
+		if (pte & _PAGE_ASM)
+			fprintf(fp, "%sASM", others++ ? "|" : "");
+		if (pte & _PAGE_KRE)
+			fprintf(fp, "%sKRE", others++ ? "|" : "");
+		if (pte & _PAGE_URE)
+			fprintf(fp, "%sURE", others++ ? "|" : "");
+		if (pte & _PAGE_KWE)
+			fprintf(fp, "%sKWE", others++ ? "|" : "");
+		if (pte & _PAGE_UWE)
+			fprintf(fp, "%sUWE", others++ ? "|" : "");
+		if (pte & _PAGE_DIRTY)
+			fprintf(fp, "%sDIRTY", others++ ? "|" : "");
+		if (pte & _PAGE_ACCESSED)
+			fprintf(fp, "%sACCESSED", others++ ? "|" : "");
+	} else {
+		fprintf(fp, "no mapping");
+	}
+
+	fprintf(fp, ")\n");
+
+	return page_present;
+}
+
+
+/*
+ *  This is currently not machine-dependent, but eventually I'd prefer to use
+ *  the HWPCB for the real physical memory size.
+ */
+static uint64_t
+sw_64_memory_size(void)
+{
+	return (generic_memory_size());
+}
+
+/*
+ *  Determine where vmalloc'd memory starts.
+ */
+static ulong
+sw_64_vmalloc_start(void)
+{
+	return VMALLOC_START;
+}
+
+/*
+ *  SW_64 tasks are all stacksize-aligned.
+ */
+static int
+sw_64_is_task_addr(ulong task)
+{
+        return (IS_KVADDR(task) && (ALIGNED_STACK_OFFSET(task) == 0));
+}
+
+/*
+ *  Keep or reject a symbol from the kernel namelist.
+ */
+int
+sw_64_verify_symbol(const char *name, ulong value, char type)
+{
+        if (CRASHDEBUG(8) && name && strlen(name))
+                fprintf(fp, "%016lx %s\n", value, name);
+
+	return (name && strlen(name) && (value > MIN_SYMBOL_VALUE));
+}
+
+/*
+ *   Override smp_num_cpus if possible and necessary.
+ */
+int
+sw_64_get_smp_cpus(void)
+{
+	int cpus;
+
+        if ((cpus = get_cpus_online()))
+                return cpus;
+        else
+        	return kt->cpus;
+}
+
+/*
+ *  Machine dependent command.
+ */
+void
+sw_64_cmd_mach(void)
+{
+        int c, cflag;
+	unsigned int radix;
+
+	cflag = radix = 0;
+
+        while ((c = getopt(argcnt, args, "cxd")) != EOF) {
+                switch(c)
+                {
+		case 'c':
+			cflag++;
+			break;
+
+		case 'x':
+			if (radix == 10)
+				error(FATAL,
+					"-d and -x are mutually exclusive\n");
+			radix = 16;
+			break;
+
+		case 'd':
+			if (radix == 16)
+				error(FATAL,
+					"-d and -x are mutually exclusive\n");
+			radix = 10;
+			break;
+
+                default:
+                        argerrs++;
+                        break;
+                }
+        }
+
+        if (argerrs)
+                cmd_usage(pc->curcmd, SYNOPSIS);
+
+	if (cflag)
+		display_hwrpb(radix);
+	else
+		sw_64_display_machine_stats();
+}
+
+/*
+ *  "mach" command output.
+ */
+static void
+sw_64_display_machine_stats(void)
+{
+        struct new_utsname *uts;
+        char buf[BUFSIZE];
+        ulong mhz;
+
+        uts = &kt->utsname;
+
+        fprintf(fp, "       MACHINE TYPE: %s\n", uts->machine);
+        fprintf(fp, "        MEMORY SIZE: %s\n", get_memory_size(buf));
+        fprintf(fp, "               CPUS: %d\n", kt->cpus);
+        fprintf(fp, "    PROCESSOR SPEED: ");
+        if ((mhz = machdep->processor_speed()))
+                fprintf(fp, "%ld Mhz\n", mhz);
+        else
+                fprintf(fp, "(unknown)\n");
+        fprintf(fp, "                 HZ: %d\n", machdep->hz);
+        fprintf(fp, "          PAGE SIZE: %d\n", PAGESIZE());
+        fprintf(fp, "      L1 CACHE SIZE: %d\n", l1_cache_size());
+        fprintf(fp, "KERNEL VIRTUAL BASE: %lx\n", machdep->kvbase);
+        fprintf(fp, "KERNEL VMALLOC BASE: %lx\n", vt->vmalloc_start);
+        fprintf(fp, "  KERNEL STACK SIZE: %ld\n", STACKSIZE());
+}
+
+/*
+ *  Display the hwrpb_struct and each percpu_struct.
+ */
+static void
+display_hwrpb(unsigned int radix)
+{
+	int cpu;
+	ulong hwrpb, percpu;
+        ulong processor_offset, processor_size;
+	
+        get_symbol_data("hwrpb", sizeof(void *), &hwrpb);
+
+        readmem(hwrpb+OFFSET(hwrpb_struct_processor_offset), KVADDR,
+                &processor_offset, sizeof(ulong),
+                "hwrpb processor_offset", FAULT_ON_ERROR);
+        readmem(hwrpb+OFFSET(hwrpb_struct_processor_size), KVADDR,
+                &processor_size, sizeof(ulong),
+                "hwrpb processor_size", FAULT_ON_ERROR);
+
+	fprintf(fp, "HWRPB:\n");
+	dump_struct("hwrpb_struct", hwrpb, radix);
+
+	for (cpu = 0; cpu < kt->cpus; cpu++) {
+		fprintf(fp, "\nCPU %d:\n", cpu); 
+		percpu = hwrpb + processor_offset + (processor_size * cpu);
+		dump_struct("percpu_struct", percpu, radix);
+	}
+}
+
+/*
+ *  Perform any leftover pre-prompt machine-specific initialization tasks here.
+ */
+static void
+sw_64_post_init(void)
+{
+	modify_signame(7, "SIGEMT", NULL);
+	modify_signame(10, "SIGBUS", NULL);
+	modify_signame(12, "SIGSYS", NULL);
+	modify_signame(16, "SIGURG", NULL);
+	modify_signame(17, "SIGSTOP", NULL);
+	modify_signame(18, "SIGTSTP", NULL);
+	modify_signame(19, "SIGCONT", NULL);
+	modify_signame(20, "SIGCHLD", NULL);
+	modify_signame(23, "SIGIO", "SIGPOLL");
+	modify_signame(29, "SIGINFO", "SIGPWR");
+	modify_signame(30, "SIGUSR1", NULL);
+	modify_signame(31, "SIGUSR2", NULL);
+}
+
+
+#endif /* SW_64 */