/*
* Copyright (C) 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
* Copyright (C) 2002-2006 Novell, Inc.
* Jan Beulich <jbeulich@novell.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* A simple API for unwinding kernel stacks. This is used for
* debugging and error reporting purposes. The kernel doesn't need
* full-blown stack unwinding with all the bells and whistles, so there
* is not much point in implementing the full Dwarf2 unwind API.
*/
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/bootmem.h>
#include <linux/sort.h>
#include <linux/slab.h>
#include <linux/stop_machine.h>
#include <linux/uaccess.h>
#include <linux/ptrace.h>
#include <asm/sections.h>
#include <asm/unaligned.h>
#include <asm/unwind.h>
extern char __start_unwind[], __end_unwind[];
/* extern const u8 __start_unwind_hdr[], __end_unwind_hdr[];*/
/* #define UNWIND_DEBUG */
#ifdef UNWIND_DEBUG
int dbg_unw;
#define unw_debug(fmt, ...) \
do { \
if (dbg_unw) \
pr_info(fmt, ##__VA_ARGS__); \
} while (0);
#else
#define unw_debug(fmt, ...)
#endif
#define MAX_STACK_DEPTH 8
#define EXTRA_INFO(f) { \
BUILD_BUG_ON_ZERO(offsetof(struct unwind_frame_info, f) \
% FIELD_SIZEOF(struct unwind_frame_info, f)) \
+ offsetof(struct unwind_frame_info, f) \
/ FIELD_SIZEOF(struct unwind_frame_info, f), \
FIELD_SIZEOF(struct unwind_frame_info, f) \
}
#define PTREGS_INFO(f) EXTRA_INFO(regs.f)
static const struct {
unsigned offs:BITS_PER_LONG / 2;
unsigned width:BITS_PER_LONG / 2;
} reg_info[] = {
UNW_REGISTER_INFO};
#undef PTREGS_INFO
#undef EXTRA_INFO
#ifndef REG_INVALID
#define REG_INVALID(r) (reg_info[r].width == 0)
#endif
#define DW_CFA_nop 0x00
#define DW_CFA_set_loc 0x01
#define DW_CFA_advance_loc1 0x02
#define DW_CFA_advance_loc2 0x03
#define DW_CFA_advance_loc4 0x04
#define DW_CFA_offset_extended 0x05
#define DW_CFA_restore_extended 0x06
#define DW_CFA_undefined 0x07
#define DW_CFA_same_value 0x08
#define DW_CFA_register 0x09
#define DW_CFA_remember_state 0x0a
#define DW_CFA_restore_state 0x0b
#define DW_CFA_def_cfa 0x0c
#define DW_CFA_def_cfa_register 0x0d
#define DW_CFA_def_cfa_offset 0x0e
#define DW_CFA_def_cfa_expression 0x0f
#define DW_CFA_expression 0x10
#define DW_CFA_offset_extended_sf 0x11
#define DW_CFA_def_cfa_sf 0x12
#define DW_CFA_def_cfa_offset_sf 0x13
#define DW_CFA_val_offset 0x14
#define DW_CFA_val_offset_sf 0x15
#define DW_CFA_val_expression 0x16
#define DW_CFA_lo_user 0x1c
#define DW_CFA_GNU_window_save 0x2d
#define DW_CFA_GNU_args_size 0x2e
#define DW_CFA_GNU_negative_offset_extended 0x2f
#define DW_CFA_hi_user 0x3f
#define DW_EH_PE_FORM 0x07
#define DW_EH_PE_native 0x00
#define DW_EH_PE_leb128 0x01
#define DW_EH_PE_data2 0x02
#define DW_EH_PE_data4 0x03
#define DW_EH_PE_data8 0x04
#define DW_EH_PE_signed 0x08
#define DW_EH_PE_ADJUST 0x70
#define DW_EH_PE_abs 0x00
#define DW_EH_PE_pcrel 0x10
#define DW_EH_PE_textrel 0x20
#define DW_EH_PE_datarel 0x30
#define DW_EH_PE_funcrel 0x40
#define DW_EH_PE_aligned 0x50
#define DW_EH_PE_indirect 0x80
#define DW_EH_PE_omit 0xff
typedef unsigned long uleb128_t;
typedef signed long sleb128_t;
static struct unwind_table {
struct {
unsigned long pc;
unsigned long range;
} core, init;
const void *address;
unsigned long size;
const unsigned char *header;
unsigned long hdrsz;
struct unwind_table *link;
const char *name;
} root_table;
struct unwind_item {
enum item_location {
Nowhere,