1168008413
structs had incorrect member offsets, limiting dtrace's usefulness
when working with them. An example of incorrect info (struct
rtentry) from before this fix:
<1738> STRUCT rtentry (200 bytes)
rt_nodes type=1731 off=0
rt_gateway type=849 off=65280 <== WRONG, should be 8 * 96
rt_flags type=3 off=65344 <== wrong again, and so on..
...
Approved by: re (kib), gnn (mentor)
MFC after: 2 weeks
614 lines
12 KiB
C
614 lines
12 KiB
C
/*-
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* Copyright (c) 2007 John Birrell (jb@freebsd.org)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <stdlib.h>
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#include "_libdwarf.h"
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static int64_t
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dwarf_decode_sleb128(uint8_t **dp)
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{
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int64_t ret = 0;
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uint8_t b;
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int shift = 0;
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uint8_t *src = *dp;
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do {
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b = *src++;
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ret |= ((b & 0x7f) << shift);
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shift += 7;
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} while ((b & 0x80) != 0);
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if (shift < 32 && (b & 0x40) != 0)
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ret |= (-1 << shift);
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*dp = src;
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return ret;
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}
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static uint64_t
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dwarf_decode_uleb128(uint8_t **dp)
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{
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uint64_t ret = 0;
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uint8_t b;
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int shift = 0;
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uint8_t *src = *dp;
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do {
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b = *src++;
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ret |= ((b & 0x7f) << shift);
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shift += 7;
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} while ((b & 0x80) != 0);
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*dp = src;
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return ret;
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}
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/*
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* Given an array of bytes of length 'len' representing a
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* DWARF expression, compute the number of operations based
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* on there being one byte describing the operation and
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* zero or more bytes of operands as defined in the standard
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* for each operation type.
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*/
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int
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dwarf_op_num(uint8_t pointer_size, uint8_t *p, int len)
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{
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int count = 0;
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int64_t sval;
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uint64_t uval;
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uint8_t *last = p + len;
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/*
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* Process each byte. If an error occurs, then the
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* count will be set to -1.
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*/
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while (p < last && count >= 0) {
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count++;
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switch (*p++) {
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/* Operations with no operands. */
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case DW_OP_deref:
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case DW_OP_reg0:
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case DW_OP_reg1:
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case DW_OP_reg2:
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case DW_OP_reg3:
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case DW_OP_reg4:
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case DW_OP_reg5:
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case DW_OP_reg6:
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case DW_OP_reg7:
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case DW_OP_reg8:
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case DW_OP_reg9:
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case DW_OP_reg10:
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case DW_OP_reg11:
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case DW_OP_reg12:
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case DW_OP_reg13:
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case DW_OP_reg14:
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case DW_OP_reg15:
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case DW_OP_reg16:
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case DW_OP_reg17:
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case DW_OP_reg18:
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case DW_OP_reg19:
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case DW_OP_reg20:
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case DW_OP_reg21:
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case DW_OP_reg22:
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case DW_OP_reg23:
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case DW_OP_reg24:
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case DW_OP_reg25:
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case DW_OP_reg26:
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case DW_OP_reg27:
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case DW_OP_reg28:
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case DW_OP_reg29:
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case DW_OP_reg30:
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case DW_OP_reg31:
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case DW_OP_lit0:
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case DW_OP_lit1:
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case DW_OP_lit2:
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case DW_OP_lit3:
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case DW_OP_lit4:
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case DW_OP_lit5:
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case DW_OP_lit6:
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case DW_OP_lit7:
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case DW_OP_lit8:
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case DW_OP_lit9:
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case DW_OP_lit10:
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case DW_OP_lit11:
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case DW_OP_lit12:
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case DW_OP_lit13:
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case DW_OP_lit14:
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case DW_OP_lit15:
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case DW_OP_lit16:
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case DW_OP_lit17:
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case DW_OP_lit18:
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case DW_OP_lit19:
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case DW_OP_lit20:
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case DW_OP_lit21:
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case DW_OP_lit22:
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case DW_OP_lit23:
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case DW_OP_lit24:
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case DW_OP_lit25:
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case DW_OP_lit26:
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case DW_OP_lit27:
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case DW_OP_lit28:
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case DW_OP_lit29:
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case DW_OP_lit30:
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case DW_OP_lit31:
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case DW_OP_dup:
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case DW_OP_drop:
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case DW_OP_over:
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case DW_OP_swap:
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case DW_OP_rot:
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case DW_OP_xderef:
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case DW_OP_abs:
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case DW_OP_and:
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case DW_OP_div:
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case DW_OP_minus:
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case DW_OP_mod:
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case DW_OP_mul:
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case DW_OP_neg:
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case DW_OP_not:
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case DW_OP_or:
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case DW_OP_plus:
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case DW_OP_shl:
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case DW_OP_shr:
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case DW_OP_shra:
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case DW_OP_xor:
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case DW_OP_eq:
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case DW_OP_ge:
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case DW_OP_gt:
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case DW_OP_le:
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case DW_OP_lt:
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case DW_OP_ne:
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case DW_OP_nop:
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break;
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/* Operations with 1-byte operands. */
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case DW_OP_const1u:
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case DW_OP_const1s:
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case DW_OP_pick:
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case DW_OP_deref_size:
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case DW_OP_xderef_size:
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p++;
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break;
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/* Operations with 2-byte operands. */
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case DW_OP_const2u:
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case DW_OP_const2s:
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case DW_OP_bra:
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case DW_OP_skip:
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p += 2;
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break;
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/* Operations with 4-byte operands. */
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case DW_OP_const4u:
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case DW_OP_const4s:
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p += 4;
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break;
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/* Operations with 8-byte operands. */
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case DW_OP_const8u:
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case DW_OP_const8s:
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p += 8;
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break;
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/* Operations with an unsigned LEB128 operand. */
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case DW_OP_constu:
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case DW_OP_plus_uconst:
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case DW_OP_regx:
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case DW_OP_piece:
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uval = dwarf_decode_uleb128(&p);
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break;
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/* Operations with a signed LEB128 operand. */
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case DW_OP_consts:
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case DW_OP_breg0:
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case DW_OP_breg1:
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case DW_OP_breg2:
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case DW_OP_breg3:
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case DW_OP_breg4:
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case DW_OP_breg5:
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case DW_OP_breg6:
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case DW_OP_breg7:
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case DW_OP_breg8:
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case DW_OP_breg9:
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case DW_OP_breg10:
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case DW_OP_breg11:
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case DW_OP_breg12:
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case DW_OP_breg13:
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case DW_OP_breg14:
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case DW_OP_breg15:
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case DW_OP_breg16:
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case DW_OP_breg17:
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case DW_OP_breg18:
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case DW_OP_breg19:
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case DW_OP_breg20:
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case DW_OP_breg21:
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case DW_OP_breg22:
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case DW_OP_breg23:
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case DW_OP_breg24:
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case DW_OP_breg25:
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case DW_OP_breg26:
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case DW_OP_breg27:
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case DW_OP_breg28:
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case DW_OP_breg29:
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case DW_OP_breg30:
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case DW_OP_breg31:
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case DW_OP_fbreg:
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sval = dwarf_decode_sleb128(&p);
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break;
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/*
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* Operations with an unsigned LEB128 operand
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* followed by a signed LEB128 operand.
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*/
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case DW_OP_bregx:
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uval = dwarf_decode_uleb128(&p);
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sval = dwarf_decode_sleb128(&p);
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break;
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/* Target address size operand. */
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case DW_OP_addr:
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p += pointer_size;
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break;
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/* All other operations cause an error. */
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default:
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count = -1;
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break;
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}
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}
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return count;
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}
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static int
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dwarf_loc_fill(Dwarf_Locdesc *lbuf, uint8_t pointer_size, uint8_t *p, int len)
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{
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int count = 0;
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int ret = DWARF_E_NONE;
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uint64_t operand1;
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uint64_t operand2;
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uint8_t *last = p + len;
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/*
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* Process each byte. If an error occurs, then the
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* count will be set to -1.
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*/
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while (p < last && ret == DWARF_E_NONE) {
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operand1 = 0;
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operand2 = 0;
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lbuf->ld_s[count].lr_atom = *p;
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switch (*p++) {
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/* Operations with no operands. */
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case DW_OP_deref:
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case DW_OP_reg0:
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case DW_OP_reg1:
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case DW_OP_reg2:
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case DW_OP_reg3:
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case DW_OP_reg4:
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case DW_OP_reg5:
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case DW_OP_reg6:
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case DW_OP_reg7:
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case DW_OP_reg8:
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case DW_OP_reg9:
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case DW_OP_reg10:
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case DW_OP_reg11:
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case DW_OP_reg12:
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case DW_OP_reg13:
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case DW_OP_reg14:
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case DW_OP_reg15:
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case DW_OP_reg16:
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case DW_OP_reg17:
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case DW_OP_reg18:
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case DW_OP_reg19:
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case DW_OP_reg20:
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case DW_OP_reg21:
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case DW_OP_reg22:
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case DW_OP_reg23:
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case DW_OP_reg24:
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case DW_OP_reg25:
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case DW_OP_reg26:
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case DW_OP_reg27:
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case DW_OP_reg28:
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case DW_OP_reg29:
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case DW_OP_reg30:
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case DW_OP_reg31:
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case DW_OP_lit0:
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case DW_OP_lit1:
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case DW_OP_lit2:
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case DW_OP_lit3:
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case DW_OP_lit4:
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case DW_OP_lit5:
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case DW_OP_lit6:
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case DW_OP_lit7:
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case DW_OP_lit8:
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case DW_OP_lit9:
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case DW_OP_lit10:
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case DW_OP_lit11:
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case DW_OP_lit12:
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case DW_OP_lit13:
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case DW_OP_lit14:
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case DW_OP_lit15:
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case DW_OP_lit16:
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case DW_OP_lit17:
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case DW_OP_lit18:
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case DW_OP_lit19:
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case DW_OP_lit20:
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case DW_OP_lit21:
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case DW_OP_lit22:
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case DW_OP_lit23:
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case DW_OP_lit24:
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case DW_OP_lit25:
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case DW_OP_lit26:
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case DW_OP_lit27:
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case DW_OP_lit28:
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case DW_OP_lit29:
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case DW_OP_lit30:
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case DW_OP_lit31:
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case DW_OP_dup:
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case DW_OP_drop:
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case DW_OP_over:
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case DW_OP_swap:
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case DW_OP_rot:
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case DW_OP_xderef:
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case DW_OP_abs:
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case DW_OP_and:
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case DW_OP_div:
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case DW_OP_minus:
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case DW_OP_mod:
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case DW_OP_mul:
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case DW_OP_neg:
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case DW_OP_not:
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case DW_OP_or:
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case DW_OP_plus:
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case DW_OP_shl:
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case DW_OP_shr:
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case DW_OP_shra:
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case DW_OP_xor:
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case DW_OP_eq:
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case DW_OP_ge:
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case DW_OP_gt:
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case DW_OP_le:
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case DW_OP_lt:
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case DW_OP_ne:
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case DW_OP_nop:
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break;
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/* Operations with 1-byte operands. */
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case DW_OP_const1u:
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case DW_OP_const1s:
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case DW_OP_pick:
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case DW_OP_deref_size:
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case DW_OP_xderef_size:
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operand1 = *p++;
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break;
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/* Operations with 2-byte operands. */
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case DW_OP_const2u:
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case DW_OP_const2s:
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case DW_OP_bra:
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case DW_OP_skip:
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p += 2;
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break;
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/* Operations with 4-byte operands. */
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case DW_OP_const4u:
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case DW_OP_const4s:
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p += 4;
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break;
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/* Operations with 8-byte operands. */
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case DW_OP_const8u:
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case DW_OP_const8s:
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p += 8;
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break;
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/* Operations with an unsigned LEB128 operand. */
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case DW_OP_constu:
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case DW_OP_plus_uconst:
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case DW_OP_regx:
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case DW_OP_piece:
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operand1 = dwarf_decode_uleb128(&p);
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break;
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/* Operations with a signed LEB128 operand. */
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case DW_OP_consts:
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case DW_OP_breg0:
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case DW_OP_breg1:
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case DW_OP_breg2:
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case DW_OP_breg3:
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case DW_OP_breg4:
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case DW_OP_breg5:
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case DW_OP_breg6:
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case DW_OP_breg7:
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case DW_OP_breg8:
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case DW_OP_breg9:
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case DW_OP_breg10:
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case DW_OP_breg11:
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case DW_OP_breg12:
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case DW_OP_breg13:
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case DW_OP_breg14:
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case DW_OP_breg15:
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case DW_OP_breg16:
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case DW_OP_breg17:
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case DW_OP_breg18:
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case DW_OP_breg19:
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case DW_OP_breg20:
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case DW_OP_breg21:
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case DW_OP_breg22:
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case DW_OP_breg23:
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case DW_OP_breg24:
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case DW_OP_breg25:
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case DW_OP_breg26:
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case DW_OP_breg27:
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case DW_OP_breg28:
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case DW_OP_breg29:
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case DW_OP_breg30:
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case DW_OP_breg31:
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case DW_OP_fbreg:
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operand1 = dwarf_decode_sleb128(&p);
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break;
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/*
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* Operations with an unsigned LEB128 operand
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* followed by a signed LEB128 operand.
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*/
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case DW_OP_bregx:
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operand1 = dwarf_decode_uleb128(&p);
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operand2 = dwarf_decode_sleb128(&p);
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break;
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/* Target address size operand. */
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case DW_OP_addr:
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p += pointer_size;
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break;
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/* All other operations cause an error. */
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default:
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break;
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}
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lbuf->ld_s[count].lr_number = operand1;
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lbuf->ld_s[count].lr_number2 = operand2;
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count++;
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}
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return ret;
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}
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int
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dwarf_locdesc(Dwarf_Die die, uint64_t attr, Dwarf_Locdesc **llbuf, Dwarf_Signed *lenp, Dwarf_Error *err)
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{
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Dwarf_AttrValue av;
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Dwarf_Locdesc *lbuf;
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int num;
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int ret = DWARF_E_NONE;
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if (err == NULL)
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return DWARF_E_ERROR;
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if (die == NULL || llbuf == NULL || lenp == NULL) {
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DWARF_SET_ERROR(err, DWARF_E_ARGUMENT);
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return DWARF_E_ARGUMENT;
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}
|
|
|
|
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;
|
|
}
|