systemtap-common 1.6-1ubuntu1 / usr / share / systemtap / runtime / unwind / unwind.h

/* -*- linux-c -*-
 *
 * dwarf unwinder header file
 * Copyright (C) 2008-2010 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

/* Used for DW_CFA_remember_state and DW_CFA_restore_state. */
#define STP_MAX_STACK_DEPTH 4

#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_OP_addr		0x03
#define	DW_OP_deref		0x06
#define	DW_OP_const1u		0x08
#define	DW_OP_const1s		0x09
#define	DW_OP_const2u		0x0a
#define	DW_OP_const2s		0x0b
#define	DW_OP_const4u		0x0c
#define	DW_OP_const4s		0x0d
#define	DW_OP_const8u		0x0e
#define	DW_OP_const8s		0x0f
#define	DW_OP_constu		0x10
#define	DW_OP_consts		0x11
#define	DW_OP_dup		0x12
#define	DW_OP_drop		0x13
#define	DW_OP_over		0x14
#define	DW_OP_pick		0x15
#define	DW_OP_swap		0x16
#define	DW_OP_rot		0x17
#define	DW_OP_xderef		0x18
#define	DW_OP_abs		0x19
#define	DW_OP_and		0x1a
#define	DW_OP_div		0x1b
#define	DW_OP_minus		0x1c
#define	DW_OP_mod		0x1d
#define	DW_OP_mul		0x1e
#define	DW_OP_neg		0x1f
#define	DW_OP_not		0x20
#define	DW_OP_or		0x21
#define	DW_OP_plus		0x22
#define	DW_OP_plus_uconst	0x23
#define	DW_OP_shl		0x24
#define	DW_OP_shr		0x25
#define	DW_OP_shra		0x26
#define	DW_OP_xor		0x27
#define	DW_OP_bra		0x28
#define	DW_OP_eq		0x29
#define	DW_OP_ge		0x2a
#define	DW_OP_gt		0x2b
#define	DW_OP_le		0x2c
#define	DW_OP_lt		0x2d
#define	DW_OP_ne		0x2e
#define	DW_OP_skip		0x2f
#define	DW_OP_lit0		0x30
#define	DW_OP_lit1		0x31
#define	DW_OP_lit2		0x32
#define	DW_OP_lit3		0x33
#define	DW_OP_lit4		0x34
#define	DW_OP_lit5		0x35
#define	DW_OP_lit6		0x36
#define	DW_OP_lit7		0x37
#define	DW_OP_lit8		0x38
#define	DW_OP_lit9		0x39
#define	DW_OP_lit10		0x3a
#define	DW_OP_lit11		0x3b
#define	DW_OP_lit12		0x3c
#define	DW_OP_lit13		0x3d
#define	DW_OP_lit14		0x3e
#define	DW_OP_lit15		0x3f
#define	DW_OP_lit16		0x40
#define	DW_OP_lit17		0x41
#define	DW_OP_lit18		0x42
#define	DW_OP_lit19		0x43
#define	DW_OP_lit20		0x44
#define	DW_OP_lit21		0x45
#define	DW_OP_lit22		0x46
#define	DW_OP_lit23		0x47
#define	DW_OP_lit24		0x48
#define	DW_OP_lit25		0x49
#define	DW_OP_lit26		0x4a
#define	DW_OP_lit27		0x4b
#define	DW_OP_lit28		0x4c
#define	DW_OP_lit29		0x4d
#define	DW_OP_lit30		0x4e
#define	DW_OP_lit31		0x4f
#define	DW_OP_reg0		0x50
#define	DW_OP_reg1		0x51
#define	DW_OP_reg2		0x52
#define	DW_OP_reg3		0x53
#define	DW_OP_reg4		0x54
#define	DW_OP_reg5		0x55
#define	DW_OP_reg6		0x56
#define	DW_OP_reg7		0x57
#define	DW_OP_reg8		0x58
#define	DW_OP_reg9		0x59
#define	DW_OP_reg10		0x5a
#define	DW_OP_reg11		0x5b
#define	DW_OP_reg12		0x5c
#define	DW_OP_reg13		0x5d
#define	DW_OP_reg14		0x5e
#define	DW_OP_reg15		0x5f
#define	DW_OP_reg16		0x60
#define	DW_OP_reg17		0x61
#define	DW_OP_reg18		0x62
#define	DW_OP_reg19		0x63
#define	DW_OP_reg20		0x64
#define	DW_OP_reg21		0x65
#define	DW_OP_reg22		0x66
#define	DW_OP_reg23		0x67
#define	DW_OP_reg24		0x68
#define	DW_OP_reg25		0x69
#define	DW_OP_reg26		0x6a
#define	DW_OP_reg27		0x6b
#define	DW_OP_reg28		0x6c
#define	DW_OP_reg29		0x6d
#define	DW_OP_reg30		0x6e
#define	DW_OP_reg31		0x6f
#define	DW_OP_breg0		0x70
#define	DW_OP_breg1		0x71
#define	DW_OP_breg2		0x72
#define	DW_OP_breg3		0x73
#define	DW_OP_breg4		0x74
#define	DW_OP_breg5		0x75
#define	DW_OP_breg6		0x76
#define	DW_OP_breg7		0x77
#define	DW_OP_breg8		0x78
#define	DW_OP_breg9		0x79
#define	DW_OP_breg10		0x7a
#define	DW_OP_breg11		0x7b
#define	DW_OP_breg12		0x7c
#define	DW_OP_breg13		0x7d
#define	DW_OP_breg14		0x7e
#define	DW_OP_breg15		0x7f
#define	DW_OP_breg16		0x80
#define	DW_OP_breg17		0x81
#define	DW_OP_breg18		0x82
#define	DW_OP_breg19		0x83
#define	DW_OP_breg20		0x84
#define	DW_OP_breg21		0x85
#define	DW_OP_breg22		0x86
#define	DW_OP_breg23		0x87
#define	DW_OP_breg24		0x88
#define	DW_OP_breg25		0x89
#define	DW_OP_breg26		0x8a
#define	DW_OP_breg27		0x8b
#define	DW_OP_breg28		0x8c
#define	DW_OP_breg29		0x8d
#define	DW_OP_breg30		0x8e
#define	DW_OP_breg31		0x8f
#define	DW_OP_regx		0x90
#define	DW_OP_fbreg		0x91
#define	DW_OP_bregx		0x92
#define	DW_OP_deref_size	0x94
#define	DW_OP_xderef_size	0x95
#define	DW_OP_nop		0x96

#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;

struct unwind_item {
	enum item_location {
		Nowhere,
		Memory,
		Register,
		Value,
		Expr,
		ValExpr
	} where;
	union {
		uleb128_t value;
		const u8 *expr;
	};
};

struct unwind_reg_state {
	union {
		struct cfa {
			uleb128_t reg, offs;
		} cfa;
		const u8 *cfa_expr;
	};
	struct unwind_item regs[ARRAY_SIZE(reg_info)];
	unsigned cfa_is_expr:1;
};

struct unwind_state {
	uleb128_t loc;
	uleb128_t codeAlign;
	sleb128_t dataAlign;
	unsigned stackDepth:8;
	struct unwind_reg_state reg[STP_MAX_STACK_DEPTH];
};

static const struct cfa badCFA = { ARRAY_SIZE(reg_info), 1 };

#endif /* STP_USE_DWARF_UNWINDER */
#endif /*_STP_UNWIND_H_*/