1 /*-
2 * Copyright (c) 2010 Kai Wang
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include "_libdwarf.h"
28
29 ELFTC_VCSID("$Id: dwarf_pro_expr.c 2074 2011-10-27 03:34:33Z jkoshy $");
30
31 static struct _Dwarf_P_Expr_Entry *
_dwarf_add_expr(Dwarf_P_Expr expr,Dwarf_Small opcode,Dwarf_Unsigned val1,Dwarf_Unsigned val2,Dwarf_Error * error)32 _dwarf_add_expr(Dwarf_P_Expr expr, Dwarf_Small opcode, Dwarf_Unsigned val1,
33 Dwarf_Unsigned val2, Dwarf_Error *error)
34 {
35 struct _Dwarf_P_Expr_Entry *ee;
36 Dwarf_Debug dbg;
37 int len;
38
39 dbg = expr->pe_dbg;
40
41 if (_dwarf_loc_expr_add_atom(dbg, NULL, NULL, opcode, val1, val2, &len,
42 error) != DW_DLE_NONE)
43 return (NULL);
44 assert(len > 0);
45
46 if ((ee = calloc(1, sizeof(*ee))) == NULL) {
47 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
48 return (NULL);
49 }
50
51 STAILQ_INSERT_TAIL(&expr->pe_eelist, ee, ee_next);
52
53 ee->ee_loc.lr_atom = opcode;
54 ee->ee_loc.lr_number = val1;
55 ee->ee_loc.lr_number2 = val2;
56 ee->ee_loc.lr_offset = expr->pe_length;
57 expr->pe_length += len;
58 expr->pe_invalid = 1;
59
60 return (ee);
61 }
62
63 int
_dwarf_expr_into_block(Dwarf_P_Expr expr,Dwarf_Error * error)64 _dwarf_expr_into_block(Dwarf_P_Expr expr, Dwarf_Error *error)
65 {
66 struct _Dwarf_P_Expr_Entry *ee;
67 Dwarf_Debug dbg;
68 int len, pos, ret;
69
70 dbg = expr->pe_dbg;
71
72 if (expr->pe_block != NULL) {
73 free(expr->pe_block);
74 expr->pe_block = NULL;
75 }
76
77 if (expr->pe_length <= 0) {
78 DWARF_SET_ERROR(dbg, error, DW_DLE_EXPR_LENGTH_BAD);
79 return (DW_DLE_EXPR_LENGTH_BAD);
80 }
81
82
83 if ((expr->pe_block = calloc((size_t) expr->pe_length, 1)) == NULL) {
84 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
85 return (DW_DLE_MEMORY);
86 }
87
88 pos = 0;
89 STAILQ_FOREACH(ee, &expr->pe_eelist, ee_next) {
90 assert((Dwarf_Unsigned) pos < expr->pe_length);
91 ret = _dwarf_loc_expr_add_atom(dbg,
92 &expr->pe_block[pos], &expr->pe_block[expr->pe_length],
93 ee->ee_loc.lr_atom, ee->ee_loc.lr_number,
94 ee->ee_loc.lr_number2, &len, error);
95 assert(ret == DW_DLE_NONE);
96 assert(len > 0);
97 pos += len;
98 }
99
100 expr->pe_invalid = 0;
101
102 return (DW_DLE_NONE);
103 }
104
105 void
_dwarf_expr_cleanup(Dwarf_P_Debug dbg)106 _dwarf_expr_cleanup(Dwarf_P_Debug dbg)
107 {
108 Dwarf_P_Expr pe, tpe;
109 struct _Dwarf_P_Expr_Entry *ee, *tee;
110
111 assert(dbg != NULL && dbg->dbg_mode == DW_DLC_WRITE);
112
113 STAILQ_FOREACH_SAFE(pe, &dbg->dbgp_pelist, pe_next, tpe) {
114 STAILQ_REMOVE(&dbg->dbgp_pelist, pe, _Dwarf_P_Expr, pe_next);
115 STAILQ_FOREACH_SAFE(ee, &pe->pe_eelist, ee_next, tee) {
116 STAILQ_REMOVE(&pe->pe_eelist, ee, _Dwarf_P_Expr_Entry,
117 ee_next);
118 free(ee);
119 }
120 if (pe->pe_block)
121 free(pe->pe_block);
122 free(pe);
123 }
124 }
125
126 Dwarf_P_Expr
dwarf_new_expr(Dwarf_P_Debug dbg,Dwarf_Error * error)127 dwarf_new_expr(Dwarf_P_Debug dbg, Dwarf_Error *error)
128 {
129 Dwarf_P_Expr pe;
130
131 if (dbg == NULL) {
132 DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
133 return (DW_DLV_BADADDR);
134 }
135
136 if ((pe = calloc(1, sizeof(struct _Dwarf_P_Expr))) == NULL) {
137 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
138 return (DW_DLV_BADADDR);
139 }
140 STAILQ_INIT(&pe->pe_eelist);
141
142 STAILQ_INSERT_TAIL(&dbg->dbgp_pelist, pe, pe_next);
143 pe->pe_dbg = dbg;
144
145 return (pe);
146 }
147
148 Dwarf_Unsigned
dwarf_add_expr_gen(Dwarf_P_Expr expr,Dwarf_Small opcode,Dwarf_Unsigned val1,Dwarf_Unsigned val2,Dwarf_Error * error)149 dwarf_add_expr_gen(Dwarf_P_Expr expr, Dwarf_Small opcode, Dwarf_Unsigned val1,
150 Dwarf_Unsigned val2, Dwarf_Error *error)
151 {
152
153 if (expr == NULL) {
154 DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
155 return (DW_DLV_NOCOUNT);
156 }
157
158 if (_dwarf_add_expr(expr, opcode, val1, val2, error) == NULL)
159 return (DW_DLV_NOCOUNT);
160
161 return (expr->pe_length);
162 }
163
164 Dwarf_Unsigned
dwarf_add_expr_addr(Dwarf_P_Expr expr,Dwarf_Unsigned address,Dwarf_Signed sym_index,Dwarf_Error * error)165 dwarf_add_expr_addr(Dwarf_P_Expr expr, Dwarf_Unsigned address,
166 Dwarf_Signed sym_index, Dwarf_Error *error)
167 {
168
169 return (dwarf_add_expr_addr_b(expr, address, sym_index, error));
170 }
171
172 Dwarf_Unsigned
dwarf_add_expr_addr_b(Dwarf_P_Expr expr,Dwarf_Unsigned address,Dwarf_Unsigned sym_index,Dwarf_Error * error)173 dwarf_add_expr_addr_b(Dwarf_P_Expr expr, Dwarf_Unsigned address,
174 Dwarf_Unsigned sym_index, Dwarf_Error *error)
175 {
176 struct _Dwarf_P_Expr_Entry *ee;
177
178 if (expr == NULL) {
179 DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
180 return (DW_DLV_NOCOUNT);
181 }
182
183 if ((ee = _dwarf_add_expr(expr, DW_OP_addr, address, 0, error)) == NULL)
184 return (DW_DLV_NOCOUNT);
185
186 ee->ee_sym = sym_index;
187
188 return (expr->pe_length);
189 }
190
191 Dwarf_Unsigned
dwarf_expr_current_offset(Dwarf_P_Expr expr,Dwarf_Error * error)192 dwarf_expr_current_offset(Dwarf_P_Expr expr, Dwarf_Error *error)
193 {
194
195 if (expr == NULL) {
196 DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
197 return (DW_DLV_NOCOUNT);
198 }
199
200 return (expr->pe_length);
201 }
202
203 Dwarf_Addr
dwarf_expr_into_block(Dwarf_P_Expr expr,Dwarf_Unsigned * length,Dwarf_Error * error)204 dwarf_expr_into_block(Dwarf_P_Expr expr, Dwarf_Unsigned *length,
205 Dwarf_Error *error)
206 {
207 Dwarf_Debug dbg;
208
209 dbg = expr != NULL ? expr->pe_dbg : NULL;
210
211 if (expr == NULL || length == NULL) {
212 DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
213 return ((Dwarf_Addr) (uintptr_t) DW_DLV_BADADDR);
214 }
215
216 if (expr->pe_block == NULL || expr->pe_invalid)
217 if (_dwarf_expr_into_block(expr, error) != DW_DLE_NONE)
218 return ((Dwarf_Addr) (uintptr_t) DW_DLV_BADADDR);
219
220 *length = expr->pe_length;
221
222 return ((Dwarf_Addr) (uintptr_t) expr->pe_block);
223 }
224