620 lines
12 KiB
C
620 lines
12 KiB
C
/* $NetBSD: dwarf_loc.c,v 1.2 2010/02/22 11:01:29 darran Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2007 John Birrell (jb@freebsd.org)
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD: src/lib/libdwarf/dwarf_loc.c,v 1.2.2.1 2009/08/03 08:13:06 kensmith Exp $
|
|
*/
|
|
|
|
#if HAVE_NBTOOL_CONFIG_H
|
|
#include "nbtool_config.h"
|
|
#endif
|
|
|
|
#include <stdlib.h>
|
|
#include "_libdwarf.h"
|
|
|
|
static int64_t
|
|
dwarf_decode_sleb128(uint8_t **dp)
|
|
{
|
|
int64_t ret = 0;
|
|
uint8_t b;
|
|
int shift = 0;
|
|
|
|
uint8_t *src = *dp;
|
|
|
|
do {
|
|
b = *src++;
|
|
|
|
ret |= ((b & 0x7f) << shift);
|
|
|
|
shift += 7;
|
|
} while ((b & 0x80) != 0);
|
|
|
|
if (shift < 32 && (b & 0x40) != 0)
|
|
ret |= (-1 << shift);
|
|
|
|
*dp = src;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static uint64_t
|
|
dwarf_decode_uleb128(uint8_t **dp)
|
|
{
|
|
uint64_t ret = 0;
|
|
uint8_t b;
|
|
int shift = 0;
|
|
|
|
uint8_t *src = *dp;
|
|
|
|
do {
|
|
b = *src++;
|
|
|
|
ret |= ((b & 0x7f) << shift);
|
|
|
|
shift += 7;
|
|
} while ((b & 0x80) != 0);
|
|
|
|
*dp = src;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Given an array of bytes of length 'len' representing a
|
|
* DWARF expression, compute the number of operations based
|
|
* on there being one byte describing the operation and
|
|
* zero or more bytes of operands as defined in the standard
|
|
* for each operation type.
|
|
*/
|
|
int
|
|
dwarf_op_num(uint8_t pointer_size, uint8_t *p, int len)
|
|
{
|
|
int count = 0;
|
|
int64_t sval;
|
|
uint64_t uval;
|
|
uint8_t *last = p + len;
|
|
|
|
/*
|
|
* Process each byte. If an error occurs, then the
|
|
* count will be set to -1.
|
|
*/
|
|
while (p < last && count >= 0) {
|
|
count++;
|
|
|
|
switch (*p++) {
|
|
/* Operations with no operands. */
|
|
case DW_OP_deref:
|
|
case DW_OP_reg0:
|
|
case DW_OP_reg1:
|
|
case DW_OP_reg2:
|
|
case DW_OP_reg3:
|
|
case DW_OP_reg4:
|
|
case DW_OP_reg5:
|
|
case DW_OP_reg6:
|
|
case DW_OP_reg7:
|
|
case DW_OP_reg8:
|
|
case DW_OP_reg9:
|
|
case DW_OP_reg10:
|
|
case DW_OP_reg11:
|
|
case DW_OP_reg12:
|
|
case DW_OP_reg13:
|
|
case DW_OP_reg14:
|
|
case DW_OP_reg15:
|
|
case DW_OP_reg16:
|
|
case DW_OP_reg17:
|
|
case DW_OP_reg18:
|
|
case DW_OP_reg19:
|
|
case DW_OP_reg20:
|
|
case DW_OP_reg21:
|
|
case DW_OP_reg22:
|
|
case DW_OP_reg23:
|
|
case DW_OP_reg24:
|
|
case DW_OP_reg25:
|
|
case DW_OP_reg26:
|
|
case DW_OP_reg27:
|
|
case DW_OP_reg28:
|
|
case DW_OP_reg29:
|
|
case DW_OP_reg30:
|
|
case DW_OP_reg31:
|
|
|
|
case DW_OP_lit0:
|
|
case DW_OP_lit1:
|
|
case DW_OP_lit2:
|
|
case DW_OP_lit3:
|
|
case DW_OP_lit4:
|
|
case DW_OP_lit5:
|
|
case DW_OP_lit6:
|
|
case DW_OP_lit7:
|
|
case DW_OP_lit8:
|
|
case DW_OP_lit9:
|
|
case DW_OP_lit10:
|
|
case DW_OP_lit11:
|
|
case DW_OP_lit12:
|
|
case DW_OP_lit13:
|
|
case DW_OP_lit14:
|
|
case DW_OP_lit15:
|
|
case DW_OP_lit16:
|
|
case DW_OP_lit17:
|
|
case DW_OP_lit18:
|
|
case DW_OP_lit19:
|
|
case DW_OP_lit20:
|
|
case DW_OP_lit21:
|
|
case DW_OP_lit22:
|
|
case DW_OP_lit23:
|
|
case DW_OP_lit24:
|
|
case DW_OP_lit25:
|
|
case DW_OP_lit26:
|
|
case DW_OP_lit27:
|
|
case DW_OP_lit28:
|
|
case DW_OP_lit29:
|
|
case DW_OP_lit30:
|
|
case DW_OP_lit31:
|
|
|
|
case DW_OP_dup:
|
|
case DW_OP_drop:
|
|
|
|
case DW_OP_over:
|
|
|
|
case DW_OP_swap:
|
|
case DW_OP_rot:
|
|
case DW_OP_xderef:
|
|
|
|
case DW_OP_abs:
|
|
case DW_OP_and:
|
|
case DW_OP_div:
|
|
case DW_OP_minus:
|
|
case DW_OP_mod:
|
|
case DW_OP_mul:
|
|
case DW_OP_neg:
|
|
case DW_OP_not:
|
|
case DW_OP_or:
|
|
case DW_OP_plus:
|
|
|
|
case DW_OP_shl:
|
|
case DW_OP_shr:
|
|
case DW_OP_shra:
|
|
case DW_OP_xor:
|
|
|
|
case DW_OP_eq:
|
|
case DW_OP_ge:
|
|
case DW_OP_gt:
|
|
case DW_OP_le:
|
|
case DW_OP_lt:
|
|
case DW_OP_ne:
|
|
|
|
case DW_OP_nop:
|
|
break;
|
|
|
|
/* Operations with 1-byte operands. */
|
|
case DW_OP_const1u:
|
|
case DW_OP_const1s:
|
|
case DW_OP_pick:
|
|
case DW_OP_deref_size:
|
|
case DW_OP_xderef_size:
|
|
p++;
|
|
break;
|
|
|
|
/* Operations with 2-byte operands. */
|
|
case DW_OP_const2u:
|
|
case DW_OP_const2s:
|
|
case DW_OP_bra:
|
|
case DW_OP_skip:
|
|
p += 2;
|
|
break;
|
|
|
|
/* Operations with 4-byte operands. */
|
|
case DW_OP_const4u:
|
|
case DW_OP_const4s:
|
|
p += 4;
|
|
break;
|
|
|
|
/* Operations with 8-byte operands. */
|
|
case DW_OP_const8u:
|
|
case DW_OP_const8s:
|
|
p += 8;
|
|
break;
|
|
|
|
/* Operations with an unsigned LEB128 operand. */
|
|
case DW_OP_constu:
|
|
case DW_OP_plus_uconst:
|
|
case DW_OP_regx:
|
|
case DW_OP_piece:
|
|
uval = dwarf_decode_uleb128(&p);
|
|
break;
|
|
|
|
/* Operations with a signed LEB128 operand. */
|
|
case DW_OP_consts:
|
|
case DW_OP_breg0:
|
|
case DW_OP_breg1:
|
|
case DW_OP_breg2:
|
|
case DW_OP_breg3:
|
|
case DW_OP_breg4:
|
|
case DW_OP_breg5:
|
|
case DW_OP_breg6:
|
|
case DW_OP_breg7:
|
|
case DW_OP_breg8:
|
|
case DW_OP_breg9:
|
|
case DW_OP_breg10:
|
|
case DW_OP_breg11:
|
|
case DW_OP_breg12:
|
|
case DW_OP_breg13:
|
|
case DW_OP_breg14:
|
|
case DW_OP_breg15:
|
|
case DW_OP_breg16:
|
|
case DW_OP_breg17:
|
|
case DW_OP_breg18:
|
|
case DW_OP_breg19:
|
|
case DW_OP_breg20:
|
|
case DW_OP_breg21:
|
|
case DW_OP_breg22:
|
|
case DW_OP_breg23:
|
|
case DW_OP_breg24:
|
|
case DW_OP_breg25:
|
|
case DW_OP_breg26:
|
|
case DW_OP_breg27:
|
|
case DW_OP_breg28:
|
|
case DW_OP_breg29:
|
|
case DW_OP_breg30:
|
|
case DW_OP_breg31:
|
|
case DW_OP_fbreg:
|
|
sval = dwarf_decode_sleb128(&p);
|
|
break;
|
|
|
|
/*
|
|
* Operations with an unsigned LEB128 operand
|
|
* followed by a signed LEB128 operand.
|
|
*/
|
|
case DW_OP_bregx:
|
|
uval = dwarf_decode_uleb128(&p);
|
|
sval = dwarf_decode_sleb128(&p);
|
|
break;
|
|
|
|
/* Target address size operand. */
|
|
case DW_OP_addr:
|
|
p += pointer_size;
|
|
break;
|
|
|
|
/* All other operations cause an error. */
|
|
default:
|
|
count = -1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static int
|
|
dwarf_loc_fill(Dwarf_Locdesc *lbuf, uint8_t pointer_size, uint8_t *p, int len)
|
|
{
|
|
int count = 0;
|
|
int ret = DWARF_E_NONE;
|
|
uint64_t operand1;
|
|
uint64_t operand2;
|
|
uint8_t *last = p + len;
|
|
|
|
/*
|
|
* Process each byte. If an error occurs, then the
|
|
* count will be set to -1.
|
|
*/
|
|
while (p < last && ret == DWARF_E_NONE) {
|
|
operand1 = 0;
|
|
operand2 = 0;
|
|
|
|
lbuf->ld_s[count].lr_atom = *p;
|
|
|
|
switch (*p++) {
|
|
/* Operations with no operands. */
|
|
case DW_OP_deref:
|
|
case DW_OP_reg0:
|
|
case DW_OP_reg1:
|
|
case DW_OP_reg2:
|
|
case DW_OP_reg3:
|
|
case DW_OP_reg4:
|
|
case DW_OP_reg5:
|
|
case DW_OP_reg6:
|
|
case DW_OP_reg7:
|
|
case DW_OP_reg8:
|
|
case DW_OP_reg9:
|
|
case DW_OP_reg10:
|
|
case DW_OP_reg11:
|
|
case DW_OP_reg12:
|
|
case DW_OP_reg13:
|
|
case DW_OP_reg14:
|
|
case DW_OP_reg15:
|
|
case DW_OP_reg16:
|
|
case DW_OP_reg17:
|
|
case DW_OP_reg18:
|
|
case DW_OP_reg19:
|
|
case DW_OP_reg20:
|
|
case DW_OP_reg21:
|
|
case DW_OP_reg22:
|
|
case DW_OP_reg23:
|
|
case DW_OP_reg24:
|
|
case DW_OP_reg25:
|
|
case DW_OP_reg26:
|
|
case DW_OP_reg27:
|
|
case DW_OP_reg28:
|
|
case DW_OP_reg29:
|
|
case DW_OP_reg30:
|
|
case DW_OP_reg31:
|
|
|
|
case DW_OP_lit0:
|
|
case DW_OP_lit1:
|
|
case DW_OP_lit2:
|
|
case DW_OP_lit3:
|
|
case DW_OP_lit4:
|
|
case DW_OP_lit5:
|
|
case DW_OP_lit6:
|
|
case DW_OP_lit7:
|
|
case DW_OP_lit8:
|
|
case DW_OP_lit9:
|
|
case DW_OP_lit10:
|
|
case DW_OP_lit11:
|
|
case DW_OP_lit12:
|
|
case DW_OP_lit13:
|
|
case DW_OP_lit14:
|
|
case DW_OP_lit15:
|
|
case DW_OP_lit16:
|
|
case DW_OP_lit17:
|
|
case DW_OP_lit18:
|
|
case DW_OP_lit19:
|
|
case DW_OP_lit20:
|
|
case DW_OP_lit21:
|
|
case DW_OP_lit22:
|
|
case DW_OP_lit23:
|
|
case DW_OP_lit24:
|
|
case DW_OP_lit25:
|
|
case DW_OP_lit26:
|
|
case DW_OP_lit27:
|
|
case DW_OP_lit28:
|
|
case DW_OP_lit29:
|
|
case DW_OP_lit30:
|
|
case DW_OP_lit31:
|
|
|
|
case DW_OP_dup:
|
|
case DW_OP_drop:
|
|
|
|
case DW_OP_over:
|
|
|
|
case DW_OP_swap:
|
|
case DW_OP_rot:
|
|
case DW_OP_xderef:
|
|
|
|
case DW_OP_abs:
|
|
case DW_OP_and:
|
|
case DW_OP_div:
|
|
case DW_OP_minus:
|
|
case DW_OP_mod:
|
|
case DW_OP_mul:
|
|
case DW_OP_neg:
|
|
case DW_OP_not:
|
|
case DW_OP_or:
|
|
case DW_OP_plus:
|
|
|
|
case DW_OP_shl:
|
|
case DW_OP_shr:
|
|
case DW_OP_shra:
|
|
case DW_OP_xor:
|
|
|
|
case DW_OP_eq:
|
|
case DW_OP_ge:
|
|
case DW_OP_gt:
|
|
case DW_OP_le:
|
|
case DW_OP_lt:
|
|
case DW_OP_ne:
|
|
|
|
case DW_OP_nop:
|
|
break;
|
|
|
|
/* Operations with 1-byte operands. */
|
|
case DW_OP_const1u:
|
|
case DW_OP_const1s:
|
|
case DW_OP_pick:
|
|
case DW_OP_deref_size:
|
|
case DW_OP_xderef_size:
|
|
operand1 = *p++;
|
|
break;
|
|
|
|
/* Operations with 2-byte operands. */
|
|
case DW_OP_const2u:
|
|
case DW_OP_const2s:
|
|
case DW_OP_bra:
|
|
case DW_OP_skip:
|
|
p += 2;
|
|
break;
|
|
|
|
/* Operations with 4-byte operands. */
|
|
case DW_OP_const4u:
|
|
case DW_OP_const4s:
|
|
p += 4;
|
|
break;
|
|
|
|
/* Operations with 8-byte operands. */
|
|
case DW_OP_const8u:
|
|
case DW_OP_const8s:
|
|
p += 8;
|
|
break;
|
|
|
|
/* Operations with an unsigned LEB128 operand. */
|
|
case DW_OP_constu:
|
|
case DW_OP_plus_uconst:
|
|
case DW_OP_regx:
|
|
case DW_OP_piece:
|
|
operand1 = dwarf_decode_uleb128(&p);
|
|
break;
|
|
|
|
/* Operations with a signed LEB128 operand. */
|
|
case DW_OP_consts:
|
|
case DW_OP_breg0:
|
|
case DW_OP_breg1:
|
|
case DW_OP_breg2:
|
|
case DW_OP_breg3:
|
|
case DW_OP_breg4:
|
|
case DW_OP_breg5:
|
|
case DW_OP_breg6:
|
|
case DW_OP_breg7:
|
|
case DW_OP_breg8:
|
|
case DW_OP_breg9:
|
|
case DW_OP_breg10:
|
|
case DW_OP_breg11:
|
|
case DW_OP_breg12:
|
|
case DW_OP_breg13:
|
|
case DW_OP_breg14:
|
|
case DW_OP_breg15:
|
|
case DW_OP_breg16:
|
|
case DW_OP_breg17:
|
|
case DW_OP_breg18:
|
|
case DW_OP_breg19:
|
|
case DW_OP_breg20:
|
|
case DW_OP_breg21:
|
|
case DW_OP_breg22:
|
|
case DW_OP_breg23:
|
|
case DW_OP_breg24:
|
|
case DW_OP_breg25:
|
|
case DW_OP_breg26:
|
|
case DW_OP_breg27:
|
|
case DW_OP_breg28:
|
|
case DW_OP_breg29:
|
|
case DW_OP_breg30:
|
|
case DW_OP_breg31:
|
|
case DW_OP_fbreg:
|
|
operand1 = dwarf_decode_sleb128(&p);
|
|
break;
|
|
|
|
/*
|
|
* Operations with an unsigned LEB128 operand
|
|
* followed by a signed LEB128 operand.
|
|
*/
|
|
case DW_OP_bregx:
|
|
operand1 = dwarf_decode_uleb128(&p);
|
|
operand2 = dwarf_decode_sleb128(&p);
|
|
break;
|
|
|
|
/* Target address size operand. */
|
|
case DW_OP_addr:
|
|
p += pointer_size;
|
|
break;
|
|
|
|
/* All other operations cause an error. */
|
|
default:
|
|
break;
|
|
}
|
|
|
|
lbuf->ld_s[count].lr_number = operand1;
|
|
lbuf->ld_s[count].lr_number2 = operand2;
|
|
|
|
count++;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
dwarf_locdesc(Dwarf_Die die, uint64_t attr, Dwarf_Locdesc **llbuf, Dwarf_Signed *lenp, Dwarf_Error *err)
|
|
{
|
|
Dwarf_AttrValue av;
|
|
Dwarf_Locdesc *lbuf;
|
|
int num;
|
|
int ret = DWARF_E_NONE;
|
|
|
|
if (err == NULL)
|
|
return DWARF_E_ERROR;
|
|
|
|
if (die == NULL || llbuf == NULL || lenp == NULL) {
|
|
DWARF_SET_ERROR(err, DWARF_E_ARGUMENT);
|
|
return DWARF_E_ARGUMENT;
|
|
}
|
|
|
|
if ((av = dwarf_attrval_find(die, attr)) == NULL) {
|
|
DWARF_SET_ERROR(err, DWARF_E_NO_ENTRY);
|
|
ret = DWARF_E_NO_ENTRY;
|
|
} else if ((lbuf = calloc(sizeof(Dwarf_Locdesc), 1)) == NULL) {
|
|
DWARF_SET_ERROR(err, DWARF_E_MEMORY);
|
|
ret = DWARF_E_MEMORY;
|
|
} else {
|
|
*lenp = 0;
|
|
switch (av->av_form) {
|
|
case DW_FORM_block:
|
|
case DW_FORM_block1:
|
|
case DW_FORM_block2:
|
|
case DW_FORM_block4:
|
|
/* Compute the number of locations: */
|
|
if ((num = dwarf_op_num(die->die_cu->cu_pointer_size,
|
|
av->u[1].u8p, av->u[0].u64)) < 0) {
|
|
DWARF_SET_ERROR(err, DWARF_E_INVALID_EXPR);
|
|
ret = DWARF_E_INVALID_EXPR;
|
|
|
|
/* Allocate an array of location structures. */
|
|
} else if ((lbuf->ld_s =
|
|
calloc(sizeof(Dwarf_Loc), num)) == NULL) {
|
|
DWARF_SET_ERROR(err, DWARF_E_MEMORY);
|
|
ret = DWARF_E_MEMORY;
|
|
|
|
/* Fill the array of location structures. */
|
|
} else if ((ret = dwarf_loc_fill(lbuf,
|
|
die->die_cu->cu_pointer_size,
|
|
av->u[1].u8p, av->u[0].u64)) != DWARF_E_NONE) {
|
|
free(lbuf->ld_s);
|
|
} else
|
|
/* Only one descriptor is returned. */
|
|
*lenp = 1;
|
|
break;
|
|
default:
|
|
printf("%s(%d): form %s not handled\n",__func__,
|
|
__LINE__,get_form_desc(av->av_form));
|
|
DWARF_SET_ERROR(err, DWARF_E_NOT_IMPLEMENTED);
|
|
ret = DWARF_E_ERROR;
|
|
}
|
|
|
|
if (ret == DWARF_E_NONE) {
|
|
*llbuf = lbuf;
|
|
} else
|
|
free(lbuf);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
dwarf_locdesc_free(Dwarf_Locdesc *lbuf, Dwarf_Error *err)
|
|
{
|
|
if (err == NULL)
|
|
return DWARF_E_ERROR;
|
|
|
|
if (lbuf == NULL) {
|
|
DWARF_SET_ERROR(err, DWARF_E_ARGUMENT);
|
|
return DWARF_E_ARGUMENT;
|
|
}
|
|
|
|
if (lbuf->ld_s != NULL)
|
|
free(lbuf->ld_s);
|
|
|
|
free(lbuf);
|
|
|
|
return DWARF_E_NONE;
|
|
}
|