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x86.c
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x86.c
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/* x86.c - core analysis suite
*
* Portions Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2014,2017-2018 David Anderson
* Copyright (C) 2002-2014,2017-2018 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 X86
/*
* NOTICE OF APPRECIATION
*
* The stack-trace related code in this file is an extension of the stack
* trace code from the Mach in-kernel debugger "ddb". Sincere thanks to
* the author(s).
*
*/
/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include "defs.h"
#include "xen_hyper_defs.h"
#ifndef MCLX
#include <sys/param.h>
#include <sys/systm.h>
#include <machine/cpu.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <ddb/ddb.h>
#include <ddb/db_access.h>
#include <ddb/db_sym.h>
#include <ddb/db_variables.h>
/*
* Machine register set.
*/
struct db_variable db_regs[] = {
"cs", &ddb_regs.tf_cs, FCN_NULL,
"ds", &ddb_regs.tf_ds, FCN_NULL,
"es", &ddb_regs.tf_es, FCN_NULL,
#if 0
"fs", &ddb_regs.tf_fs, FCN_NULL,
"gs", &ddb_regs.tf_gs, FCN_NULL,
#endif
"ss", &ddb_regs.tf_ss, FCN_NULL,
"eax", &ddb_regs.tf_eax, FCN_NULL,
"ecx", &ddb_regs.tf_ecx, FCN_NULL,
"edx", &ddb_regs.tf_edx, FCN_NULL,
"ebx", &ddb_regs.tf_ebx, FCN_NULL,
"esp", &ddb_regs.tf_esp, FCN_NULL,
"ebp", &ddb_regs.tf_ebp, FCN_NULL,
"esi", &ddb_regs.tf_esi, FCN_NULL,
"edi", &ddb_regs.tf_edi, FCN_NULL,
"eip", &ddb_regs.tf_eip, FCN_NULL,
"efl", &ddb_regs.tf_eflags, FCN_NULL,
};
struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
#else
typedef int db_strategy_t; /* search strategy */
#define DB_STGY_ANY 0 /* anything goes */
#define DB_STGY_XTRN 1 /* only external symbols */
#define DB_STGY_PROC 2 /* only procedures */
typedef ulong db_addr_t; /* address - unsigned */
typedef int db_expr_t; /* expression - signed */
/*
* Symbol representation is specific to the symtab style:
* BSD compilers use dbx' nlist, other compilers might use
* a different one
*/
typedef char * db_sym_t; /* opaque handle on symbols */
#define DB_SYM_NULL ((db_sym_t)0)
typedef uint boolean_t;
#endif /* !MCLX */
/*
* Stack trace.
*/
#ifdef MCLX
static db_expr_t db_get_value(db_addr_t, int, boolean_t, struct bt_info *);
#define INKERNEL(va) (machdep->kvtop(CURRENT_CONTEXT(), va, &phys, 0))
#else
#define INKERNEL(va) (((vm_offset_t)(va)) >= USRSTACK)
#endif
struct i386_frame {
struct i386_frame *f_frame;
int f_retaddr;
int f_arg0;
};
#ifdef MCLX
#define NORMAL 0
#define IDT_DIRECT_ENTRY 1
#define IDT_JMP_ERROR_CODE 2
#define RET_FROM_INTR 3
#define SIGNAL_RETURN 4
#else
#define NORMAL 0
#define TRAP 1
#define INTERRUPT 2
#define SYSCALL 3
#endif
#ifndef MCLX
typedef vm_offset_t db_addr_t;
#endif
#ifdef MCLX
struct eframe {
int eframe_found;
int eframe_type;
ulong eframe_addr;
ulong jmp_error_code_eip;
};
static void db_nextframe(struct i386_frame **, db_addr_t *, struct eframe *,
struct bt_info *);
static int dump_eframe(struct eframe *, int, struct bt_info *);
static int eframe_numargs(ulong eip, struct bt_info *);
static int check_for_eframe(char *, struct bt_info *);
static void x86_user_eframe(struct bt_info *);
static ulong x86_next_eframe(ulong addr, struct bt_info *bt);
static void x86_cmd_mach(void);
static int x86_get_smp_cpus(void);
static void x86_display_machine_stats(void);
static void x86_display_cpu_data(unsigned int);
static void x86_display_memmap(void);
static int x86_omit_frame_pointer(void);
static void x86_back_trace_cmd(struct bt_info *);
static int is_rodata_text(ulong);
static int mach_CRASHDEBUG(ulong);
static db_sym_t db_search_symbol(db_addr_t, db_strategy_t,db_expr_t *);
static void db_symbol_values(db_sym_t, char **, db_expr_t *);
static int db_sym_numargs(db_sym_t, int *, char **);
static void x86_dump_line_number(ulong);
static void x86_clear_machdep_cache(void);
static void x86_parse_cmdline_args(void);
static ulong mach_debug = 0;
static int
mach_CRASHDEBUG(ulong dval)
{
if (CRASHDEBUG(dval))
return TRUE;
return (mach_debug >= dval);
}
#else
static void db_nextframe(struct i386_frame **, db_addr_t *);
#endif
#ifdef MCLX
static int db_numargs(struct i386_frame *, struct bt_info *bt);
static void db_print_stack_entry(char *, int, char **, int *,
db_addr_t, struct bt_info *, struct eframe *, int,
struct i386_frame *);
#else
static void db_print_stack_entry (char *, int, char **, int *, db_addr_t);
#endif
/*
* Figure out how many arguments were passed into the frame at "fp".
*/
static int
db_numargs(fp, bt)
struct i386_frame *fp;
struct bt_info *bt;
{
int *argp;
int inst;
int args;
argp = (int *)db_get_value((int)&fp->f_retaddr, 4, FALSE, bt);
/*
* etext is wrong for LKMs. We should attempt to interpret
* the instruction at the return address in all cases. This
* may require better fault handling.
*/
#ifdef MCLX
if (!is_kernel_text((ulong)argp)) {
#else
if (argp < (int *)btext || argp >= (int *)etext) {
#endif
args = 5;
} else {
inst = db_get_value((int)argp, 4, FALSE, bt);
if ((inst & 0xff) == 0x59) /* popl %ecx */
args = 1;
else if ((inst & 0xffff) == 0xc483) /* addl $Ibs, %esp */
args = ((inst >> 16) & 0xff) / 4;
else
args = 5;
}
return (args);
}
#ifdef MCLX
static int
eframe_numargs(ulong eip, struct bt_info *bt)
{
int inst;
int args;
if (!is_kernel_text(eip))
args = 5;
else {
inst = db_get_value((int)eip, 4, FALSE, bt);
if ((inst & 0xff) == 0x59) /* popl %ecx */
args = 1;
else if ((inst & 0xffff) == 0xc483) /* addl $Ibs, %esp */
args = ((inst >> 16) & 0xff) / 4;
else
args = 5;
}
return args;
}
#endif
static void
#ifdef MCLX
db_print_stack_entry(name, narg, argnp, argp, callpc, bt, ep, fnum, frame)
#else
db_print_stack_entry(name, narg, argnp, argp, callpc)
#endif
char *name;
int narg;
char **argnp;
int *argp;
db_addr_t callpc;
#ifdef MCLX
struct bt_info *bt;
struct eframe *ep;
int fnum;
struct i386_frame *frame;
#endif
{
#ifdef MCLX
int i;
db_expr_t arg;
char buf1[BUFSIZE];
char buf2[BUFSIZE];
char buf3[BUFSIZE];
char *sp;
if (!name) {
if (IS_MODULE_VADDR(callpc) &&
module_symbol(callpc, NULL, NULL, buf1, *gdb_output_radix)) {
sprintf(buf2, "(%s)", buf1);
name = buf2;
}
else
name = "(unknown module)";
}
if (strstr(name, "_MODULE_START_")) {
sprintf(buf3, "(%s module)", name + strlen("_MODULE_START_"));
name = buf3;
}
if (BT_REFERENCE_CHECK(bt)) {
switch (bt->ref->cmdflags & (BT_REF_SYMBOL|BT_REF_HEXVAL))
{
case BT_REF_SYMBOL:
if (ep->eframe_found && ep->jmp_error_code_eip) {
if (STREQ(closest_symbol(ep->jmp_error_code_eip),
bt->ref->str) ||
STREQ(closest_symbol(callpc), bt->ref->str))
bt->ref->cmdflags |= BT_REF_FOUND;
} else if (STREQ(name, bt->ref->str))
bt->ref->cmdflags |= BT_REF_FOUND;
break;
case BT_REF_HEXVAL:
if (ep->eframe_found && ep->jmp_error_code_eip &&
(bt->ref->hexval == ep->jmp_error_code_eip))
bt->ref->cmdflags |= BT_REF_FOUND;
else if (bt->ref->hexval == callpc)
bt->ref->cmdflags |= BT_REF_FOUND;
break;
}
return;
} else {
fprintf(fp, "%s#%d [%08lx] ",
fnum < 10 ? " " : "", fnum, (ulong)frame);
if (ep->eframe_found && ep->jmp_error_code_eip)
fprintf(fp, "%s (via %s)",
closest_symbol(callpc),
closest_symbol(ep->jmp_error_code_eip));
else
fprintf(fp, "%s", name);
fprintf(fp, " at %lx\n", callpc);
}
if (ep->eframe_found)
goto done_entry;
if (STREQ(name, "L6"))
goto done_entry;
fprintf(fp, " (");
if ((i = get_function_numargs(callpc)) >= 0)
narg = i;
while (narg) {
if (argnp)
fprintf(fp, "%s=", *argnp++);
arg = db_get_value((int)argp, 4, FALSE, bt);
if ((sp = value_symbol(arg)))
fprintf(fp, "%s", sp);
else if ((bt->flags & BT_SYMBOLIC_ARGS) &&
strlen(value_to_symstr(arg, buf1, 0)))
fprintf(fp, "%s", buf1);
else
fprintf(fp, "%x", arg);
argp++;
if (--narg != 0)
fprintf(fp, ", ");
}
if (i == 0)
fprintf(fp, "void");
fprintf(fp, ")\n");
done_entry:
if (bt->flags & BT_LINE_NUMBERS)
x86_dump_line_number(callpc);
return;
#else
db_printf("%s(", name);
while (narg) {
if (argnp)
db_printf("%s=", *argnp++);
db_printf("%r", db_get_value((int)argp, 4, FALSE, bt));
argp++;
if (--narg != 0)
db_printf(",");
}
db_printf(") at ");
db_printsym(callpc, DB_STGY_PROC);
db_printf("\n");
return;
#endif
}
#ifdef MCLX
static db_sym_t
db_search_symbol(db_addr_t val, db_strategy_t strategy, db_expr_t *offp)
{
struct syment *sp;
ulong offset;
if ((sp = value_search(val, &offset))) {
*offp = (db_expr_t)offset;
return(sp->name);
} else
return DB_SYM_NULL;
}
/*
* Return name and value of a symbol
*/
static void
db_symbol_values(db_sym_t sym, char **namep, db_expr_t *valuep)
{
struct syment *sp;
if (sym == DB_SYM_NULL) {
*namep = 0;
return;
}
if ((sp = symbol_search(sym)) == NULL) {
error(INFO, "db_symbol_values: cannot find symbol: %s\n", sym);
*namep = 0;
return;
}
*namep = sp->name;
if (valuep)
*valuep = sp->value;
#ifndef MCLX
X_db_symbol_values(db_last_symtab, sym, namep, &value);
if (db_symbol_is_ambiguous(sym))
*namep = db_qualify(sym, db_last_symtab->name);
if (valuep)
*valuep = value;
#endif
}
static unsigned db_extend[] = { /* table for sign-extending */
0,
0xFFFFFF80U,
0xFFFF8000U,
0xFF800000U
};
static db_expr_t
db_get_value(addr, size, is_signed, bt)
db_addr_t addr;
int size;
boolean_t is_signed;
struct bt_info * bt;
{
char data[sizeof(int)];
db_expr_t value;
int i;
#ifndef MCLX
db_read_bytes(addr, size, data);
#else
BZERO(data, sizeof(int));
if (INSTACK(addr, bt)) {
if (size == sizeof(ulong))
return (db_expr_t)GET_STACK_ULONG(addr);
else
GET_STACK_DATA(addr, data, size);
} else {
if ((size == sizeof(int)) &&
text_value_cache(addr, 0, (uint32_t *)&value))
return value;
if (!readmem(addr, KVADDR, &value, size, "db_get_value",
RETURN_ON_ERROR))
error(FATAL, "db_get_value: read error: address: %lx\n",
addr);
if (size == sizeof(int))
text_value_cache(addr, value, NULL);
}
#endif
value = 0;
#if BYTE_MSF
for (i = 0; i < size; i++)
#else /* BYTE_LSF */
for (i = size - 1; i >= 0; i--)
#endif
{
value = (value << 8) + (data[i] & 0xFF);
}
if (size < 4) {
if (is_signed && (value & db_extend[size]) != 0)
value |= db_extend[size];
}
return (value);
}
static int
db_sym_numargs(db_sym_t sym, int *nargp, char **argnames)
{
return FALSE;
}
#endif
/*
* Figure out the next frame up in the call stack.
*/
#ifdef MCLX
static void
db_nextframe(fp, ip, ep, bt)
struct i386_frame **fp; /* in/out */
db_addr_t *ip; /* out */
struct eframe *ep;
struct bt_info *bt;
#else
static void
db_nextframe(fp, ip)
struct i386_frame **fp; /* in/out */
db_addr_t *ip; /* out */
#endif
{
int eip, ebp;
db_expr_t offset;
char *sym, *name;
#ifdef MCLX
static int last_ebp;
static int last_eip;
struct syment *sp;
#endif
eip = db_get_value((int) &(*fp)->f_retaddr, 4, FALSE, bt);
ebp = db_get_value((int) &(*fp)->f_frame, 4, FALSE, bt);
/*
* Figure out frame type, presuming normal.
*/
BZERO(ep, sizeof(struct eframe));
ep->eframe_type = NORMAL;
sym = db_search_symbol(eip, DB_STGY_ANY, &offset);
db_symbol_values(sym, &name, NULL);
if (name != NULL) {
ep->eframe_type = check_for_eframe(name, bt);
#ifndef MCLX
if (!strcmp(name, "calltrap")) {
frame_type = TRAP;
} else if (!strncmp(name, "Xresume", 7)) {
frame_type = INTERRUPT;
} else if (!strcmp(name, "_Xsyscall")) {
frame_type = SYSCALL;
}
#endif
}
switch (ep->eframe_type)
{
case NORMAL:
ep->eframe_found = FALSE;
break;
case IDT_DIRECT_ENTRY:
case RET_FROM_INTR:
case SIGNAL_RETURN:
ep->eframe_found = TRUE;
ep->eframe_addr = x86_next_eframe(last_ebp + sizeof(ulong)*2,
bt);
break;
case IDT_JMP_ERROR_CODE:
ep->eframe_found = TRUE;
ep->eframe_addr = x86_next_eframe(last_ebp + sizeof(ulong) * 4,
bt);
if ((sp = x86_jmp_error_code(last_eip)))
ep->jmp_error_code_eip = sp->value;
break;
default:
error(FATAL, "unknown exception frame type?\n");
}
*ip = (db_addr_t) eip;
*fp = (struct i386_frame *) ebp;
last_ebp = ebp;
last_eip = eip;
return;
#ifndef MCLX
db_print_stack_entry(name, 0, 0, 0, eip);
/*
* Point to base of trapframe which is just above the
* current frame.
*/
tf = (struct trapframe *) ((int)*fp + 8);
esp = (ISPL(tf->tf_cs) == SEL_UPL) ? tf->tf_esp : (int)&tf->tf_esp;
switch (frame_type) {
case TRAP:
if (INKERNEL((int) tf)) {
eip = tf->tf_eip;
ebp = tf->tf_ebp;
db_printf(
"--- trap %#r, eip = %#r, esp = %#r, ebp = %#r ---\n",
tf->tf_trapno, eip, esp, ebp);
}
break;
case SYSCALL:
if (INKERNEL((int) tf)) {
eip = tf->tf_eip;
ebp = tf->tf_ebp;
db_printf(
"--- syscall %#r, eip = %#r, esp = %#r, ebp = %#r ---\n",
tf->tf_eax, eip, esp, ebp);
}
break;
case INTERRUPT:
tf = (struct trapframe *)((int)*fp + 16);
if (INKERNEL((int) tf)) {
eip = tf->tf_eip;
ebp = tf->tf_ebp;
db_printf(
"--- interrupt, eip = %#r, esp = %#r, ebp = %#r ---\n",
eip, esp, ebp);
}
break;
default:
break;
}
*ip = (db_addr_t) eip;
*fp = (struct i386_frame *) ebp;
#endif
}
#ifdef MCLX
void
x86_back_trace_cmd(struct bt_info *bt)
#else
ulong
db_stack_trace_cmd(addr, have_addr, count, modif, task, flags)
db_expr_t addr;
boolean_t have_addr;
db_expr_t count;
char *modif;
ulong task;
ulong flags;
#endif /* MCLX */
{
struct i386_frame *frame;
int *argp;
db_addr_t callpc;
boolean_t first;
#ifdef MCLX
db_expr_t addr;
boolean_t have_addr;
db_expr_t count;
char *modif;
db_addr_t last_callpc;
ulong lastframe;
physaddr_t phys;
int frame_number;
int forced;
struct eframe eframe, *ep;
char dbuf[BUFSIZE];
if (!(bt->flags & BT_USER_SPACE) &&
(!bt->stkptr || !accessible(bt->stkptr))) {
error(INFO, "cannot determine starting stack pointer\n");
if (KVMDUMP_DUMPFILE())
kvmdump_display_regs(bt->tc->processor, fp);
else if (ELF_NOTES_VALID() && DISKDUMP_DUMPFILE())
diskdump_display_regs(bt->tc->processor, fp);
else if (SADUMP_DUMPFILE())
sadump_display_regs(bt->tc->processor, fp);
return;
}
if (bt->flags & BT_USER_SPACE) {
if (KVMDUMP_DUMPFILE())
kvmdump_display_regs(bt->tc->processor, fp);
else if (ELF_NOTES_VALID() && DISKDUMP_DUMPFILE())
diskdump_display_regs(bt->tc->processor, fp);
else if (SADUMP_DUMPFILE())
sadump_display_regs(bt->tc->processor, fp);
fprintf(fp, " #0 [user space]\n");
return;
} else if ((bt->flags & BT_KERNEL_SPACE)) {
if (KVMDUMP_DUMPFILE())
kvmdump_display_regs(bt->tc->processor, fp);
else if (ELF_NOTES_VALID() && DISKDUMP_DUMPFILE())
diskdump_display_regs(bt->tc->processor, fp);
else if (SADUMP_DUMPFILE())
sadump_display_regs(bt->tc->processor, fp);
}
addr = bt->stkptr;
have_addr = TRUE;
count = 50;
modif = (char *)bt->instptr;
mach_debug = bt->debug;
if ((machdep->flags & OMIT_FRAME_PTR) ||
bt->debug ||
(bt->flags & BT_FRAMESIZE_DEBUG) ||
!(bt->flags & BT_OLD_BACK_TRACE)) {
bt->flags &= ~BT_OLD_BACK_TRACE;
lkcd_x86_back_trace(bt, 0, fp);
return;
}
if (mach_CRASHDEBUG(2)) {
fprintf(fp, "--> stkptr: %lx instptr: %lx (%s)\n",
bt->stkptr, bt->instptr, closest_symbol(bt->instptr));
}
#endif
if (count == -1)
count = 65535;
if (!have_addr) {
#ifndef MCLX
frame = (struct i386_frame *)ddb_regs.tf_ebp;
if (frame == NULL)
frame = (struct i386_frame *)(ddb_regs.tf_esp - 4);
callpc = (db_addr_t)ddb_regs.tf_eip;
#endif
} else {
frame = (struct i386_frame *)addr;
lastframe = (ulong)frame;
ep = &eframe;
BZERO(ep, sizeof(struct eframe));
ep->eframe_found = FALSE;
callpc = (db_addr_t)db_get_value((int)&frame->f_retaddr, 4,
FALSE, bt);
if (modif) {
frame_number = 0;
forced = TRUE;
callpc = (db_addr_t)modif;
}
else {
frame_number = 1;
forced = FALSE;
if (!is_kernel_text(callpc))
error(INFO,
"callpc from stack is not a text address\n");
}
}
first = TRUE;
while (count--) {
struct i386_frame *actframe;
int narg;
char * name;
db_expr_t offset;
db_sym_t sym;
#define MAXNARG 16
char *argnames[MAXNARG], **argnp = NULL;
sym = db_search_symbol(callpc, DB_STGY_ANY, &offset);
db_symbol_values(sym, &name, NULL);
/*
* Attempt to determine a (possibly fake) frame that gives
* the caller's pc. It may differ from `frame' if the
* current function never sets up a standard frame or hasn't
* set one up yet or has just discarded one. The last two
* cases can be guessed fairly reliably for code generated
* by gcc. The first case is too much trouble to handle in
* general because the amount of junk on the stack depends
* on the pc (the special handling of "calltrap", etc. in
* db_nextframe() works because the `next' pc is special).
*/
actframe = frame;
if (first && !have_addr) {
#ifdef MCLX
error(FATAL, "cannot handle \"!have_addr\" path #2\n");
#else
int instr;
instr = db_get_value(callpc, 4, FALSE);
if ((instr & 0x00ffffff) == 0x00e58955) {
/* pushl %ebp; movl %esp, %ebp */
actframe = (struct i386_frame *)
(ddb_regs.tf_esp - 4);
} else if ((instr & 0x0000ffff) == 0x0000e589) {
/* movl %esp, %ebp */
actframe = (struct i386_frame *)
ddb_regs.tf_esp;
if (ddb_regs.tf_ebp == 0) {
/* Fake the caller's frame better. */
frame = actframe;
}
} else if ((instr & 0x000000ff) == 0x000000c3) {
/* ret */
actframe = (struct i386_frame *)
(ddb_regs.tf_esp - 4);
} else if (offset == 0) {
/* Probably a symbol in assembler code. */
actframe = (struct i386_frame *)
(ddb_regs.tf_esp - 4);
}
#endif
}
first = FALSE;
argp = &actframe->f_arg0;
narg = MAXNARG;
if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) {
argnp = argnames;
} else {
narg = db_numargs(frame, bt);
}
#ifdef MCLX
if (is_kernel_text(callpc) || IS_MODULE_VADDR(callpc)) {
if (mach_CRASHDEBUG(2))
fprintf(fp,
"--> (1) lastframe: %lx => frame: %lx\n",
lastframe, (ulong)frame);
db_print_stack_entry(name, narg, argnp, argp, callpc,
bt, ep, frame_number++, frame);
if (STREQ(closest_symbol(callpc), "start_secondary"))
break;
if (BT_REFERENCE_FOUND(bt))
return;
if ((ulong)frame < lastframe) {
break;
}
if (INSTACK(frame, bt) &&
((ulong)frame > lastframe))
lastframe = (ulong)frame;
} else {
if (!(forced && frame_number == 1)) {
if (is_kernel_data(callpc)) {
if (mach_CRASHDEBUG(2))
fprintf(fp,
"--> break(1): callpc %lx is data?\n",
callpc);
if (!is_rodata_text(callpc))
break;
}
if (mach_CRASHDEBUG(2))
fprintf(fp,
"--> (2) lastframe: %lx => frame: %lx\n",
lastframe, (ulong)frame);
db_print_stack_entry(name, narg, argnp,
argp, callpc, bt, ep,
frame_number++, frame);
if (BT_REFERENCE_FOUND(bt))
return;
if ((ulong)frame < lastframe) {
break;
}
if (INSTACK(frame, bt) &&
((ulong)frame > lastframe))
lastframe = (ulong)frame;
}
}
if (!INSTACK(frame, bt)) {
if (mach_CRASHDEBUG(2))
fprintf(fp,
"--> break: !INSTACK(frame: %lx, task: %lx)\n",
(ulong)frame, bt->task);
break;
}
#else
db_print_stack_entry(name, narg, argnp, argp, callpc);
#endif
if (actframe != frame) {
/* `frame' belongs to caller. */
callpc = (db_addr_t)
db_get_value((int)&actframe->f_retaddr, 4,
FALSE, bt);
continue;
}
if (ep->eframe_found)
frame_number = dump_eframe(ep, frame_number, bt);
last_callpc = callpc;
skip_frame:
db_nextframe(&frame, &callpc, ep, bt);
if (mach_CRASHDEBUG(2)) {
fprintf(fp,
"--> db_nextframe: frame: %lx callpc: %lx [%s]\n",
(ulong)frame, callpc,
value_to_symstr(callpc, dbuf,0));
if (callpc == last_callpc)
fprintf(fp, "last callpc == callpc!\n");
}
if ((callpc == last_callpc) &&
STREQ(closest_symbol(callpc), "smp_stop_cpu_interrupt"))
goto skip_frame;
if (INSTACK(frame, bt) &&
((ulong)frame < lastframe))
if (mach_CRASHDEBUG(2))
fprintf(fp,
"--> frame pointer reversion?\n");
if (INKERNEL((int) callpc) && !INKERNEL((int) frame)) {
sym = db_search_symbol(callpc, DB_STGY_ANY, &offset);
db_symbol_values(sym, &name, NULL);
if (is_kernel_data(callpc)) {
if (mach_CRASHDEBUG(2))
fprintf(fp,
"--> break(2): callpc %lx is data?\n",
callpc);
if (!is_rodata_text(callpc))
break;
}
if (mach_CRASHDEBUG(2))
fprintf(fp,
"--> (3) lastframe: %lx => frame: %lx\n",
lastframe, (ulong)frame);
db_print_stack_entry(name, 0, 0, 0, callpc, bt, ep,
frame_number++, frame);
if (BT_REFERENCE_FOUND(bt))
return;
if ((ulong)frame < lastframe) {
if (STREQ(closest_symbol(callpc), "reschedule"))
x86_user_eframe(bt);
break;
}
if (INSTACK(frame, bt) &&
((ulong)frame > lastframe))
lastframe = (ulong)frame;
if (mach_CRASHDEBUG(2))
fprintf(fp,
"--> break: INKERNEL(callpc: %lx [%s]) && !INKERNEL(frame: %lx)\n",
callpc, value_to_symstr(callpc, dbuf, 0),
(ulong)frame);
break;
}
if (!INKERNEL((int) frame)) {
if (mach_CRASHDEBUG(2))
fprintf(fp,
"--> break: !INKERNEL(frame: %lx)\n",
(ulong)frame);
break;
}
}
if (mach_CRASHDEBUG(2)) {
fprintf(fp, "--> returning lastframe: %lx\n", lastframe);
}
if (ep->eframe_found)
frame_number = dump_eframe(ep, frame_number, bt);
#ifndef MCLX
return(lastframe);
#endif
}
/*
* The remainder of this file was generated at MCL to segregate
* x86-specific needs.
*/
static int x86_uvtop(struct task_context *, ulong, physaddr_t *, int);
static int x86_kvtop(struct task_context *, ulong, physaddr_t *, int);
static int x86_uvtop_PAE(struct task_context *, ulong, physaddr_t *, int);
static int x86_kvtop_PAE(struct task_context *, ulong, physaddr_t *, int);
static int x86_uvtop_xen_wpt(struct task_context *, ulong, physaddr_t *, int);
static int x86_kvtop_xen_wpt(struct task_context *, ulong, physaddr_t *, int);
static int x86_uvtop_xen_wpt_PAE(struct task_context *, ulong, physaddr_t *, int);