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libunwind-eh_elf/include/dwarf.h
mostang.com!davidm adeb9b5984 (struct dwarf_cursor): Add members eh_args and eh_valid_mask so 
we can track writes to exception-handling argument regs.

2004/11/17 02:43:39-08:00 mostang.com!davidm
(dwarf_cie_info_pool): New declaration.
(dwarf_cie_info_t): New type.
(dwarf_state_record): Drop cfa_is_sp member.
(dwarf_extract_proc_info_from_fde): Rename from dwarf_parse_fde.

2004/10/25 17:38:51+02:00 homeip.net!davidm
Fix typo: DW_CFA_CFA_expression -> DW_CFA_expression.

(Logical change 1.290)
2005-05-03 09:13:17 +00:00

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/* libunwind - a platform-independent unwind library
Copyright (c) 2003-2004 Hewlett-Packard Development Company, L.P.
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
This file is part of libunwind.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#ifndef dwarf_h
#define dwarf_h
#include "internal.h"
#include "mempool.h"
struct dwarf_cursor; /* forward-declaration */
#include "dwarf-config.h"
/* DWARF expression opcodes. */
typedef enum
{
DW_OP_addr = 0x03,
DW_OP_deref = 0x06,
DW_OP_const1u = 0x08,
DW_OP_const1s = 0x09,
DW_OP_const2u = 0x0a,
DW_OP_const2s = 0x0b,
DW_OP_const4u = 0x0c,
DW_OP_const4s = 0x0d,
DW_OP_const8u = 0x0e,
DW_OP_const8s = 0x0f,
DW_OP_constu = 0x10,
DW_OP_consts = 0x11,
DW_OP_dup = 0x12,
DW_OP_drop = 0x13,
DW_OP_over = 0x14,
DW_OP_pick = 0x15,
DW_OP_swap = 0x16,
DW_OP_rot = 0x17,
DW_OP_xderef = 0x18,
DW_OP_abs = 0x19,
DW_OP_and = 0x1a,
DW_OP_div = 0x1b,
DW_OP_minus = 0x1c,
DW_OP_mod = 0x1d,
DW_OP_mul = 0x1e,
DW_OP_neg = 0x1f,
DW_OP_not = 0x20,
DW_OP_or = 0x21,
DW_OP_plus = 0x22,
DW_OP_plus_uconst = 0x23,
DW_OP_shl = 0x24,
DW_OP_shr = 0x25,
DW_OP_shra = 0x26,
DW_OP_xor = 0x27,
DW_OP_skip = 0x2f,
DW_OP_bra = 0x28,
DW_OP_eq = 0x29,
DW_OP_ge = 0x2a,
DW_OP_gt = 0x2b,
DW_OP_le = 0x2c,
DW_OP_lt = 0x2d,
DW_OP_ne = 0x2e,
DW_OP_lit0 = 0x30,
DW_OP_lit1, DW_OP_lit2, DW_OP_lit3, DW_OP_lit4, DW_OP_lit5,
DW_OP_lit6, DW_OP_lit7, DW_OP_lit8, DW_OP_lit9, DW_OP_lit10,
DW_OP_lit11, DW_OP_lit12, DW_OP_lit13, DW_OP_lit14, DW_OP_lit15,
DW_OP_lit16, DW_OP_lit17, DW_OP_lit18, DW_OP_lit19, DW_OP_lit20,
DW_OP_lit21, DW_OP_lit22, DW_OP_lit23, DW_OP_lit24, DW_OP_lit25,
DW_OP_lit26, DW_OP_lit27, DW_OP_lit28, DW_OP_lit29, DW_OP_lit30,
DW_OP_lit31,
DW_OP_reg0 = 0x50,
DW_OP_reg1, DW_OP_reg2, DW_OP_reg3, DW_OP_reg4, DW_OP_reg5,
DW_OP_reg6, DW_OP_reg7, DW_OP_reg8, DW_OP_reg9, DW_OP_reg10,
DW_OP_reg11, DW_OP_reg12, DW_OP_reg13, DW_OP_reg14, DW_OP_reg15,
DW_OP_reg16, DW_OP_reg17, DW_OP_reg18, DW_OP_reg19, DW_OP_reg20,
DW_OP_reg21, DW_OP_reg22, DW_OP_reg23, DW_OP_reg24, DW_OP_reg25,
DW_OP_reg26, DW_OP_reg27, DW_OP_reg28, DW_OP_reg29, DW_OP_reg30,
DW_OP_reg31,
DW_OP_breg0 = 0x70,
DW_OP_breg1, DW_OP_breg2, DW_OP_breg3, DW_OP_breg4, DW_OP_breg5,
DW_OP_breg6, DW_OP_breg7, DW_OP_breg8, DW_OP_breg9, DW_OP_breg10,
DW_OP_breg11, DW_OP_breg12, DW_OP_breg13, DW_OP_breg14, DW_OP_breg15,
DW_OP_breg16, DW_OP_breg17, DW_OP_breg18, DW_OP_breg19, DW_OP_breg20,
DW_OP_breg21, DW_OP_breg22, DW_OP_breg23, DW_OP_breg24, DW_OP_breg25,
DW_OP_breg26, DW_OP_breg27, DW_OP_breg28, DW_OP_breg29, DW_OP_breg30,
DW_OP_breg31,
DW_OP_regx = 0x90,
DW_OP_fbreg = 0x91,
DW_OP_bregx = 0x92,
DW_OP_piece = 0x93,
DW_OP_deref_size = 0x94,
DW_OP_xderef_size = 0x95,
DW_OP_nop = 0x96,
DW_OP_push_object_address = 0x97,
DW_OP_call2 = 0x98,
DW_OP_call4 = 0x99,
DW_OP_call_ref = 0x9a,
DW_OP_lo_user = 0xe0,
DW_OP_hi_user = 0xff
}
dwarf_expr_op_t;
#define DWARF_CIE_VERSION 3 /* GCC emits version 1??? */
#define DWARF_CFA_OPCODE_MASK 0xc0
#define DWARF_CFA_OPERAND_MASK 0x3f
typedef enum
{
DW_CFA_advance_loc = 0x40,
DW_CFA_offset = 0x80,
DW_CFA_restore = 0xc0,
DW_CFA_nop = 0x00,
DW_CFA_set_loc = 0x01,
DW_CFA_advance_loc1 = 0x02,
DW_CFA_advance_loc2 = 0x03,
DW_CFA_advance_loc4 = 0x04,
DW_CFA_offset_extended = 0x05,
DW_CFA_restore_extended = 0x06,
DW_CFA_undefined = 0x07,
DW_CFA_same_value = 0x08,
DW_CFA_register = 0x09,
DW_CFA_remember_state = 0x0a,
DW_CFA_restore_state = 0x0b,
DW_CFA_def_cfa = 0x0c,
DW_CFA_def_cfa_register = 0x0d,
DW_CFA_def_cfa_offset = 0x0e,
DW_CFA_def_cfa_expression = 0x0f,
DW_CFA_expression = 0x10,
DW_CFA_offset_extended_sf = 0x11,
DW_CFA_def_cfa_sf = 0x12,
DW_CFA_def_cfa_offset_sf = 0x13,
DW_CFA_lo_user = 0x1c,
DW_CFA_MIPS_advance_loc8 = 0x1d,
DW_CFA_GNU_window_save = 0x2d,
DW_CFA_GNU_args_size = 0x2e,
DW_CFA_GNU_negative_offset_extended = 0x2f,
DW_CFA_hi_user = 0x3c
}
dwarf_cfa_t;
/* DWARF Pointer-Encoding (PEs).
Pointer-Encodings were invented for the GCC exception-handling
support for C++, but they represent a rather generic way of
describing the format in which an address/pointer is stored and
hence we include the definitions here, in the main dwarf.h file.
The Pointer-Encoding format is partially documented in Linux Base
Spec v1.3 (http://www.linuxbase.org/spec/). The rest is reverse
engineered from GCC.
*/
#define DW_EH_PE_FORMAT_MASK 0x0f /* format of the encoded value */
#define DW_EH_PE_APPL_MASK 0x70 /* how the value is to be applied */
/* Flag bit. If set, the resulting pointer is the address of the word
that contains the final address. */
#define DW_EH_PE_indirect 0x80
/* Pointer-encoding formats: */
#define DW_EH_PE_omit 0xff
#define DW_EH_PE_ptr 0x00 /* pointer-sized unsigned value */
#define DW_EH_PE_uleb128 0x01 /* unsigned LE base-128 value */
#define DW_EH_PE_udata2 0x02 /* unsigned 16-bit value */
#define DW_EH_PE_udata4 0x03 /* unsigned 32-bit value */
#define DW_EH_PE_udata8 0x04 /* unsigned 64-bit value */
#define DW_EH_PE_sleb128 0x09 /* signed LE base-128 value */
#define DW_EH_PE_sdata2 0x0a /* signed 16-bit value */
#define DW_EH_PE_sdata4 0x0b /* signed 32-bit value */
#define DW_EH_PE_sdata8 0x0c /* signed 64-bit value */
/* Pointer-encoding application: */
#define DW_EH_PE_absptr 0x00 /* absolute value */
#define DW_EH_PE_pcrel 0x10 /* rel. to addr. of encoded value */
#define DW_EH_PE_textrel 0x20 /* text-relative (GCC-specific???) */
#define DW_EH_PE_datarel 0x30 /* data-relative */
/* The following are not documented by LSB v1.3, yet they are used by
GCC, presumably they aren't documented by LSB since they aren't
used on Linux: */
#define DW_EH_PE_funcrel 0x40 /* start-of-procedure-relative */
#define DW_EH_PE_aligned 0x50 /* aligned pointer */
extern struct mempool dwarf_reg_state_pool;
extern struct mempool dwarf_cie_info_pool;
typedef enum
{
DWARF_WHERE_UNDEF, /* register isn't saved at all */
DWARF_WHERE_SAME, /* register has same value as in prev. frame */
DWARF_WHERE_CFAREL, /* register saved at CFA-relative address */
DWARF_WHERE_REG, /* register saved in another register */
DWARF_WHERE_EXPR, /* register saved */
}
dwarf_where_t;
typedef struct
{
dwarf_where_t where; /* how is the register saved? */
unw_word_t val; /* where it's saved */
}
dwarf_save_loc_t;
/* For uniformity, we'd like to treat the CFA save-location like any
other register save-location, but this doesn't quite work, because
the CFA can be expressed as a (REGISTER,OFFSET) pair. To handle
this, we use two dwarf_save_loc structures to describe the CFA.
The first one (CFA_REG_COLUMN), tells us where the CFA is saved.
In the case of DWARF_WHERE_EXPR, the CFA is defined by a DWARF
location expression whose address is given by member "val". In the
case of DWARF_WHERE_REG, member "val" gives the number of the
base-register and the "val" member of DWARF_CFA_OFF_COLUMN gives
the offset value. */
#define DWARF_CFA_REG_COLUMN DWARF_NUM_PRESERVED_REGS
#define DWARF_CFA_OFF_COLUMN (DWARF_NUM_PRESERVED_REGS + 1)
typedef struct dwarf_reg_state
{
struct dwarf_reg_state *next; /* for rs_stack */
dwarf_save_loc_t reg[DWARF_NUM_PRESERVED_REGS + 2];
}
dwarf_reg_state_t;
typedef struct dwarf_cie_info
{
unw_word_t cie_instr_start; /* start addr. of CIE "initial_instructions" */
unw_word_t cie_instr_end; /* end addr. of CIE "initial_instructions" */
unw_word_t fde_instr_start; /* start addr. of FDE "instructions" */
unw_word_t fde_instr_end; /* end addr. of FDE "instructions" */
unw_word_t code_align; /* code-alignment factor */
unw_word_t data_align; /* data-alignment factor */
unw_word_t ret_addr_column; /* column of return-address register */
unw_word_t handler; /* address of personality-routine */
uint16_t abi;
uint16_t tag;
uint8_t fde_encoding;
uint8_t lsda_encoding;
unsigned int sized_augmentation : 1;
unsigned int have_abi_marker : 1;
}
dwarf_cie_info_t;
typedef struct dwarf_state_record
{
unsigned char fde_encoding;
unw_word_t args_size;
dwarf_reg_state_t rs_initial; /* reg-state after CIE instructions */
dwarf_reg_state_t rs_current; /* current reg-state */
}
dwarf_state_record_t;
typedef struct dwarf_cursor
{
void *as_arg; /* argument to address-space callbacks */
unw_addr_space_t as; /* reference to per-address-space info */
unw_word_t cfa; /* canonical frame address; aka frame-/stack-pointer */
unw_word_t ip; /* instruction pointer */
unw_word_t args_size; /* size of arguments */
unw_word_t ret_addr_column; /* column for return-address */
unw_word_t eh_args[UNW_TDEP_NUM_EH_REGS];
unsigned int eh_valid_mask;
dwarf_loc_t loc[DWARF_NUM_PRESERVED_REGS];
unsigned int pi_valid :1; /* is proc_info valid? */
unsigned int pi_is_dynamic :1; /* proc_info found via dynamic proc info? */
unw_proc_info_t pi; /* info about current procedure */
}
dwarf_cursor_t;
/* Convenience macros: */
#define dwarf_init UNW_ARCH_OBJ (dwarf_init)
#define dwarf_find_proc_info UNW_OBJ (dwarf_find_proc_info)
#define dwarf_search_unwind_table UNW_OBJ (dwarf_search_unwind_table)
#define dwarf_put_unwind_info UNW_OBJ (dwarf_put_unwind_info)
#define dwarf_put_unwind_info UNW_OBJ (dwarf_put_unwind_info)
#define dwarf_eval_expr UNW_OBJ (dwarf_eval_expr)
#define dwarf_extract_proc_info_from_fde \
UNW_OBJ (dwarf_extract_proc_info_from_fde)
#define dwarf_find_save_locs UNW_OBJ (dwarf_find_save_locs)
#define dwarf_create_state_record UNW_OBJ (dwarf_create_state_record)
#define dwarf_make_proc_info UNW_OBJ (dwarf_make_proc_info)
#define dwarf_read_encoded_pointer UNW_OBJ (dwarf_read_encoded_pointer)
#define dwarf_step UNW_OBJ (dwarf_step)
extern int dwarf_init (void);
extern int dwarf_find_proc_info (unw_addr_space_t as, unw_word_t ip,
unw_proc_info_t *pi,
int need_unwind_info, void *arg);
extern int dwarf_search_unwind_table (unw_addr_space_t as,
unw_word_t ip,
unw_dyn_info_t *di,
unw_proc_info_t *pi,
int need_unwind_info, void *arg);
extern void dwarf_put_unwind_info (unw_addr_space_t as,
unw_proc_info_t *pi, void *arg);
extern int dwarf_eval_expr (struct dwarf_cursor *c, unw_word_t *addr,
unw_word_t len, unw_word_t *valp,
int *is_register);
extern int dwarf_extract_proc_info_from_fde (unw_addr_space_t as,
unw_accessors_t *a,
unw_word_t *fde_addr,
unw_proc_info_t *pi,
int need_unwind_info,
void *arg);
extern int dwarf_find_save_locs (struct dwarf_cursor *c);
extern int dwarf_create_state_record (struct dwarf_cursor *c,
dwarf_state_record_t *sr);
extern int dwarf_make_proc_info (struct dwarf_cursor *c);
extern int dwarf_read_encoded_pointer (unw_addr_space_t as,
unw_accessors_t *a,
unw_word_t *addr,
unsigned char encoding,
const unw_proc_info_t *pi,
unw_word_t *valp, void *arg);
extern int dwarf_step (struct dwarf_cursor *c);
#endif /* dwarf_h */
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