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/* -*- linux-c -*-
*
* dwarf unwinder header file
* Copyright (C) 2008, 2009 Red Hat Inc.
* Copyright (C) 2002-2006 Novell, Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#ifndef _STP_UNWIND_H_
#define _STP_UNWIND_H_
#ifdef STP_USE_DWARF_UNWINDER
#if defined (__x86_64__)
#include "x86_64.h"
#elif defined (__i386__)
#include "i386.h"
#else
#error "Unsupported dwarf unwind architecture"
#endif
#define STP_MAX_STACK_DEPTH 8
#ifndef BUILD_BUG_ON_ZERO
#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
#endif
#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_absptr 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_FORM 0x07 /* mask */
#define DW_EH_PE_signed 0x08 /* signed versions of above have this bit set */
#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_ADJUST 0x70 /* mask */
#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 {
unsigned long pc; /* text */
unsigned long range; /* text_size */
const void *address; /* unwind_data */
unsigned long size; /* unwind_data_len */
const unsigned char *header; /* unwind_header */
unsigned long hdrsz;
struct unwind_table *link;
const char *name; /* module name */
} root_table;
struct unwind_item {
enum item_location {
Nowhere,
Memory,
Register,
Value
} where;
uleb128_t value;
};
struct unwind_state {
uleb128_t loc, org;
const u8 *cieStart, *cieEnd;
uleb128_t codeAlign;
sleb128_t dataAlign;
struct cfa {
uleb128_t reg, offs;
} cfa;
struct unwind_item regs[ARRAY_SIZE(reg_info)];
unsigned stackDepth:8;
unsigned version:8;
const u8 *label;
const u8 *stack[STP_MAX_STACK_DEPTH];
};
static const struct cfa badCFA = { ARRAY_SIZE(reg_info), 1 };
static unsigned long read_pointer(const u8 **pLoc,
const void *end,
signed ptrType);
static const u32 bad_cie, not_fde;
static const u32 *cie_for_fde(const u32 *fde, void *table, int is_ehframe);
static signed fde_pointer_type(const u32 *cie);
#endif /* STP_USE_DWARF_UNWINDER */
#endif /*_STP_UNWIND_H_*/
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