1 /* $NetBSD: kobj_machdep.c,v 1.8 2023/04/28 07:33:56 skrll Exp $ */
2
3 /*-
4 * Copyright (c) 2001 Jake Burkholder.
5 * Copyright (c) 2000 Eduardo Horvath.
6 * Copyright (c) 1999, 2008 The NetBSD Foundation, Inc.
7 * All rights reserved.
8 *
9 * This code is derived from software contributed to The NetBSD Foundation
10 * by Paul Kranenburg.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35 __KERNEL_RCSID(0, "$NetBSD: kobj_machdep.c,v 1.8 2023/04/28 07:33:56 skrll Exp $");
36
37 #define ELFSIZE ARCH_ELFSIZE
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/kobj.h>
42 #include <sys/exec.h>
43 #include <sys/exec_elf.h>
44
45 /*
46 * The following table holds for each relocation type:
47 * - the width in bits of the memory location the relocation
48 * applies to (not currently used)
49 * - the number of bits the relocation value must be shifted to the
50 * right (i.e. discard least significant bits) to fit into
51 * the appropriate field in the instruction word.
52 * - flags indicating whether
53 * * the relocation involves a symbol
54 * * the relocation is relative to the current position
55 * * the relocation is for a GOT entry
56 * * the relocation is relative to the load address
57 *
58 */
59 #define _RF_S 0x80000000 /* Resolve symbol */
60 #define _RF_A 0x40000000 /* Use addend */
61 #define _RF_P 0x20000000 /* Location relative */
62 #define _RF_G 0x10000000 /* GOT offset */
63 #define _RF_B 0x08000000 /* Load address relative */
64 #define _RF_U 0x04000000 /* Unaligned */
65 #define _RF_SZ(s) (((s) & 0xff) << 8) /* memory target size */
66 #define _RF_RS(s) ( (s) & 0xff) /* right shift */
67 static const int reloc_target_flags[] = {
68 0, /* NONE */
69 _RF_S|_RF_A| _RF_SZ(8) | _RF_RS(0), /* RELOC_8 */
70 _RF_S|_RF_A| _RF_SZ(16) | _RF_RS(0), /* RELOC_16 */
71 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* RELOC_32 */
72 _RF_S|_RF_A|_RF_P| _RF_SZ(8) | _RF_RS(0), /* DISP_8 */
73 _RF_S|_RF_A|_RF_P| _RF_SZ(16) | _RF_RS(0), /* DISP_16 */
74 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* DISP_32 */
75 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP_30 */
76 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP_22 */
77 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(10), /* HI22 */
78 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 22 */
79 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 13 */
80 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* LO10 */
81 _RF_G| _RF_SZ(32) | _RF_RS(0), /* GOT10 */
82 _RF_G| _RF_SZ(32) | _RF_RS(0), /* GOT13 */
83 _RF_G| _RF_SZ(32) | _RF_RS(10), /* GOT22 */
84 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PC10 */
85 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PC22 */
86 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WPLT30 */
87 _RF_SZ(32) | _RF_RS(0), /* COPY */
88 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* GLOB_DAT */
89 _RF_SZ(32) | _RF_RS(0), /* JMP_SLOT */
90 _RF_A| _RF_B| _RF_SZ(64) | _RF_RS(0), /* RELATIVE */
91 _RF_S|_RF_A| _RF_U| _RF_SZ(32) | _RF_RS(0), /* UA_32 */
92
93 _RF_A| _RF_SZ(32) | _RF_RS(0), /* PLT32 */
94 _RF_A| _RF_SZ(32) | _RF_RS(10), /* HIPLT22 */
95 _RF_A| _RF_SZ(32) | _RF_RS(0), /* LOPLT10 */
96 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PCPLT32 */
97 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PCPLT22 */
98 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PCPLT10 */
99 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 10 */
100 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 11 */
101 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* 64 */
102 _RF_S|_RF_A|/*extra*/ _RF_SZ(32) | _RF_RS(0), /* OLO10 */
103 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(42), /* HH22 */
104 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(32), /* HM10 */
105 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(10), /* LM22 */
106 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(42), /* PC_HH22 */
107 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(32), /* PC_HM10 */
108 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PC_LM22 */
109 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP16 */
110 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP19 */
111 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* GLOB_JMP */
112 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 7 */
113 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 5 */
114 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 6 */
115 _RF_S|_RF_A|_RF_P| _RF_SZ(64) | _RF_RS(0), /* DISP64 */
116 _RF_A| _RF_SZ(64) | _RF_RS(0), /* PLT64 */
117 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(10), /* HIX22 */
118 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* LOX10 */
119 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(22), /* H44 */
120 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(12), /* M44 */
121 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* L44 */
122 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* REGISTER */
123 _RF_S|_RF_A| _RF_U| _RF_SZ(64) | _RF_RS(0), /* UA64 */
124 _RF_S|_RF_A| _RF_U| _RF_SZ(16) | _RF_RS(0), /* UA16 */
125 };
126
127 #if 0
128 static const char *reloc_names[] = {
129 "NONE", "RELOC_8", "RELOC_16", "RELOC_32", "DISP_8",
130 "DISP_16", "DISP_32", "WDISP_30", "WDISP_22", "HI22",
131 "22", "13", "LO10", "GOT10", "GOT13",
132 "GOT22", "PC10", "PC22", "WPLT30", "COPY",
133 "GLOB_DAT", "JMP_SLOT", "RELATIVE", "UA_32", "PLT32",
134 "HIPLT22", "LOPLT10", "LOPLT10", "PCPLT22", "PCPLT32",
135 "10", "11", "64", "OLO10", "HH22",
136 "HM10", "LM22", "PC_HH22", "PC_HM10", "PC_LM22",
137 "WDISP16", "WDISP19", "GLOB_JMP", "7", "5", "6",
138 "DISP64", "PLT64", "HIX22", "LOX10", "H44", "M44",
139 "L44", "REGISTER", "UA64", "UA16"
140 };
141 #endif
142
143 #define RELOC_RESOLVE_SYMBOL(t) ((reloc_target_flags[t] & _RF_S) != 0)
144 #define RELOC_PC_RELATIVE(t) ((reloc_target_flags[t] & _RF_P) != 0)
145 #define RELOC_BASE_RELATIVE(t) ((reloc_target_flags[t] & _RF_B) != 0)
146 #define RELOC_UNALIGNED(t) ((reloc_target_flags[t] & _RF_U) != 0)
147 #define RELOC_USE_ADDEND(t) ((reloc_target_flags[t] & _RF_A) != 0)
148 #define RELOC_TARGET_SIZE(t) ((reloc_target_flags[t] >> 8) & 0xff)
149 #define RELOC_VALUE_RIGHTSHIFT(t) (reloc_target_flags[t] & 0xff)
150
151 static const long reloc_target_bitmask[] = {
152 #define _BM(x) (~(-(1ULL << (x))))
153 0, /* NONE */
154 _BM(8), _BM(16), _BM(32), /* RELOC_8, _16, _32 */
155 _BM(8), _BM(16), _BM(32), /* DISP8, DISP16, DISP32 */
156 _BM(30), _BM(22), /* WDISP30, WDISP22 */
157 _BM(22), _BM(22), /* HI22, _22 */
158 _BM(13), _BM(10), /* RELOC_13, _LO10 */
159 _BM(10), _BM(13), _BM(22), /* GOT10, GOT13, GOT22 */
160 _BM(10), _BM(22), /* _PC10, _PC22 */
161 _BM(30), 0, /* _WPLT30, _COPY */
162 _BM(32), _BM(32), _BM(32), /* _GLOB_DAT, JMP_SLOT, _RELATIVE */
163 _BM(32), _BM(32), /* _UA32, PLT32 */
164 _BM(22), _BM(10), /* _HIPLT22, LOPLT10 */
165 _BM(32), _BM(22), _BM(10), /* _PCPLT32, _PCPLT22, _PCPLT10 */
166 _BM(10), _BM(11), -1, /* _10, _11, _64 */
167 _BM(13), _BM(22), /* _OLO10, _HH22 */
168 _BM(10), _BM(22), /* _HM10, _LM22 */
169 _BM(22), _BM(10), _BM(22), /* _PC_HH22, _PC_HM10, _PC_LM22 */
170 _BM(16), _BM(19), /* _WDISP16, _WDISP19 */
171 -1, /* GLOB_JMP */
172 _BM(7), _BM(5), _BM(6), /* _7, _5, _6 */
173 -1, -1, /* DISP64, PLT64 */
174 _BM(22), _BM(13), /* HIX22, LOX10 */
175 _BM(22), _BM(10), _BM(12), /* H44, M44, L44 */
176 -1, -1, _BM(16), /* REGISTER, UA64, UA16 */
177 #undef _BM
178 };
179 #define RELOC_VALUE_BITMASK(t) (reloc_target_bitmask[t])
180
181 int
kobj_reloc(kobj_t ko,uintptr_t relocbase,const void * data,bool isrela,bool local)182 kobj_reloc(kobj_t ko, uintptr_t relocbase, const void *data,
183 bool isrela, bool local)
184 {
185 const Elf_Rela *rela;
186 Elf_Word *where32;
187 Elf_Addr *where;
188 uintptr_t rtype, symidx;
189 Elf_Addr value;
190 Elf_Addr mask;
191 Elf_Addr addr;
192 vaddr_t base;
193 int error;
194
195 if (!isrela)
196 return -1;
197
198 rela = (const Elf_Rela *)data;
199 where = (Elf_Addr *)(relocbase + rela->r_offset);
200 where32 = (Elf_Word *)where;
201 rtype = ELF64_R_TYPE(rela->r_info);
202 symidx = ELF_R_SYM(rela->r_info);
203
204 const Elf_Sym *sym = kobj_symbol(ko, symidx);
205
206 if (!local && ELF_ST_BIND(sym->st_info) == STB_LOCAL) {
207 return 0;
208 }
209
210 if (rtype == R_SPARC_NONE)
211 return 0;
212
213 if ((rtype & 0x00ff) == R_SPARC_OLO10)
214 rtype = R_SPARC_OLO10;
215
216 if (rtype == R_SPARC_RELATIVE) {
217 kobj_stat(ko, &base, NULL);
218 value = rela->r_addend + (Elf_Addr)base;
219 where = (Elf_Addr *)((Elf_Addr)base + rela->r_offset);
220 *where = value;
221 return 0;
222 }
223
224 if (rtype == R_SPARC_JMP_SLOT || rtype == R_SPARC_COPY ||
225 rtype >= __arraycount(reloc_target_bitmask))
226 return -1;
227
228 if (RELOC_UNALIGNED(rtype))
229 return -1;
230
231 value = rela->r_addend;
232
233 if (RELOC_RESOLVE_SYMBOL(rtype)) {
234 error = kobj_sym_lookup(ko, symidx, &addr);
235 if (error)
236 return -1;
237 value += addr;
238 }
239
240 if (rtype == R_SPARC_OLO10)
241 value = (value & 0x3ff) + (((Elf64_Xword)rela->r_info<<32)>>40);
242
243 if (RELOC_PC_RELATIVE(rtype))
244 value -= (Elf_Addr)where;
245
246 if (RELOC_BASE_RELATIVE(rtype))
247 value += relocbase;
248
249 mask = RELOC_VALUE_BITMASK(rtype);
250 value >>= RELOC_VALUE_RIGHTSHIFT(rtype);
251 value &= mask;
252
253 if (RELOC_TARGET_SIZE(rtype) > 32) {
254 *where &= ~mask;
255 *where |= value;
256 } else {
257 *where32 &= ~mask;
258 *where32 |= value;
259 }
260
261 return 0;
262 }
263
264 int
kobj_machdep(kobj_t ko,void * base,size_t size,bool load)265 kobj_machdep(kobj_t ko, void *base, size_t size, bool load)
266 {
267
268 return 0;
269 }
270