1/*	$NetBSD: dwarf_pro_frame.c,v 1.5 2024/03/03 17:37:32 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2010 Kai Wang
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include "_libdwarf.h"
30
31__RCSID("$NetBSD: dwarf_pro_frame.c,v 1.5 2024/03/03 17:37:32 christos Exp $");
32ELFTC_VCSID("Id: dwarf_pro_frame.c 2074 2011-10-27 03:34:33Z jkoshy");
33
34Dwarf_P_Fde
35dwarf_new_fde(Dwarf_P_Debug dbg, Dwarf_Error *error)
36{
37	Dwarf_P_Fde fde;
38
39	if (dbg == NULL) {
40		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
41		return (DW_DLV_BADADDR);
42	}
43
44	if ((fde = calloc(1, sizeof(struct _Dwarf_Fde))) == NULL) {
45		DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
46		return (DW_DLV_BADADDR);
47	}
48
49	fde->fde_dbg = dbg;
50
51	return (fde);
52}
53
54Dwarf_Unsigned
55dwarf_add_frame_cie(Dwarf_P_Debug dbg, char *augmenter, Dwarf_Small caf,
56    Dwarf_Small daf, Dwarf_Small ra, Dwarf_Ptr initinst,
57    Dwarf_Unsigned inst_len, Dwarf_Error *error)
58{
59	Dwarf_P_Cie cie;
60
61	if (dbg == NULL) {
62		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
63		return (DW_DLV_NOCOUNT);
64	}
65
66	if ((cie = calloc(1, sizeof(struct _Dwarf_Cie))) == NULL) {
67		DWARF_SET_ERROR(dbg, error,DW_DLE_MEMORY);
68		return (DW_DLV_NOCOUNT);
69	}
70	STAILQ_INSERT_TAIL(&dbg->dbgp_cielist, cie, cie_next);
71
72	cie->cie_index = dbg->dbgp_cielen++;
73
74	if (augmenter != NULL) {
75		cie->cie_augment = (uint8_t *) strdup(augmenter);
76		if (cie->cie_augment == NULL) {
77			DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
78			return (DW_DLV_NOCOUNT);
79		}
80	}
81
82	cie->cie_caf = caf;
83	cie->cie_daf = (int8_t) daf; /* daf is signed. */
84	cie->cie_ra = ra;
85	if (initinst != NULL && inst_len > 0) {
86		cie->cie_initinst = malloc((size_t) inst_len);
87		if (cie->cie_initinst == NULL) {
88			DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
89			return (DW_DLV_NOCOUNT);
90		}
91		memcpy(cie->cie_initinst, initinst, inst_len);
92		cie->cie_instlen = inst_len;
93	}
94
95	return (cie->cie_index);
96}
97
98Dwarf_Unsigned
99dwarf_add_frame_fde(Dwarf_P_Debug dbg, Dwarf_P_Fde fde, Dwarf_P_Die die,
100    Dwarf_Unsigned cie, Dwarf_Addr virt_addr, Dwarf_Unsigned code_len,
101    Dwarf_Unsigned symbol_index, Dwarf_Error *error)
102{
103
104	return (dwarf_add_frame_fde_b(dbg, fde, die, cie, virt_addr, code_len,
105	    symbol_index, 0, 0, error));
106}
107
108Dwarf_Unsigned
109dwarf_add_frame_fde_b(Dwarf_P_Debug dbg, Dwarf_P_Fde fde, Dwarf_P_Die die,
110    Dwarf_Unsigned cie, Dwarf_Addr virt_addr, Dwarf_Unsigned code_len,
111    Dwarf_Unsigned symbol_index, Dwarf_Unsigned end_symbol_index,
112    Dwarf_Addr offset_from_end_sym, Dwarf_Error *error)
113{
114	Dwarf_P_Cie ciep;
115	int i;
116
117	/*
118	 * XXX SGI libdwarf need the DIE arg because later it will insert a
119	 * DW_AT_MIPS_fde attribute, which points to the offset the
120	 * correspoding FDE, into this DIE. Do we need this?
121	 */
122	(void) die;
123
124	if (dbg == NULL || fde == NULL || fde->fde_dbg != dbg) {
125		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
126		return (DW_DLV_NOCOUNT);
127	}
128
129	ciep = STAILQ_FIRST(&dbg->dbgp_cielist);
130	for (i = 0; (Dwarf_Unsigned) i < cie; i++) {
131		ciep = STAILQ_NEXT(ciep, cie_next);
132		if (ciep == NULL)
133			break;
134	}
135	if (ciep == NULL) {
136		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
137		return (DW_DLV_NOCOUNT);
138	}
139
140	if (end_symbol_index > 0 &&
141	    (dbg->dbgp_flags & DW_DLC_SYMBOLIC_RELOCATIONS) == 0) {
142		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
143		return (DW_DLV_NOCOUNT);
144	}
145
146	fde->fde_cie = ciep;
147	fde->fde_initloc = virt_addr;
148	fde->fde_adrange = code_len;
149	fde->fde_symndx = symbol_index;
150	fde->fde_esymndx = end_symbol_index;
151	fde->fde_eoff = offset_from_end_sym;
152
153	STAILQ_INSERT_TAIL(&dbg->dbgp_fdelist, fde, fde_next);
154
155	return (dbg->dbgp_fdelen++);
156}
157
158Dwarf_P_Fde
159dwarf_fde_cfa_offset(Dwarf_P_Fde fde, Dwarf_Unsigned reg, Dwarf_Signed offset,
160    Dwarf_Error *error)
161{
162	int ret;
163	Dwarf_Debug dbg;
164
165	dbg = fde != NULL ? fde->fde_dbg : NULL;
166
167	if (fde == NULL || reg > 0x3f) {
168		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
169		return (DW_DLV_BADADDR);
170	}
171
172	ret = _dwarf_frame_fde_add_inst(fde, DW_CFA_offset | (reg & 0x3f),
173	    offset, 0, error);
174
175	if (ret != DW_DLE_NONE)
176		return (DW_DLV_BADADDR);
177
178	return (fde);
179}
180
181Dwarf_P_Fde
182dwarf_add_fde_inst(Dwarf_P_Fde fde, Dwarf_Small op, Dwarf_Unsigned val1,
183    Dwarf_Unsigned val2, Dwarf_Error *error)
184{
185	int ret;
186
187	if (fde == NULL) {
188		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
189		return (DW_DLV_BADADDR);
190	}
191
192	ret = _dwarf_frame_fde_add_inst(fde, op, val1, val2, error);
193
194	if (ret != DW_DLE_NONE)
195		return (DW_DLV_BADADDR);
196
197	return (fde);
198}
199