1 | /* |
---|
2 | * Taken from NetBSD and stripped of the relocations not needed on RTEMS. |
---|
3 | */ |
---|
4 | |
---|
5 | /* $NetBSD: mdreloc.c,v 1.26 2010/01/14 11:58:32 skrll Exp $ */ |
---|
6 | |
---|
7 | #include <sys/cdefs.h> |
---|
8 | |
---|
9 | #include <errno.h> |
---|
10 | #include <stdio.h> |
---|
11 | #include <sys/types.h> |
---|
12 | #include <sys/stat.h> |
---|
13 | |
---|
14 | #include <rtems/rtl/rtl.h> |
---|
15 | #include "rtl-elf.h" |
---|
16 | #include "rtl-error.h" |
---|
17 | #include <rtems/rtl/rtl-trace.h> |
---|
18 | #include "rtl-unwind.h" |
---|
19 | #include "rtl-unwind-dw2.h" |
---|
20 | |
---|
21 | static inline int overflow_8_check(int value) |
---|
22 | { |
---|
23 | if ((value & 0xffffff00) && (~value & 0xffffff80)) |
---|
24 | return true; |
---|
25 | return false; |
---|
26 | } |
---|
27 | |
---|
28 | static inline int overflow_16_check(int value) |
---|
29 | { |
---|
30 | if ((value & 0xffff0000) && (~value & 0xffff8000)) |
---|
31 | return true; |
---|
32 | return false; |
---|
33 | } |
---|
34 | |
---|
35 | uint32_t |
---|
36 | rtems_rtl_elf_section_flags (const rtems_rtl_obj* obj, |
---|
37 | const Elf_Shdr* shdr) |
---|
38 | { |
---|
39 | return 0; |
---|
40 | } |
---|
41 | |
---|
42 | uint32_t |
---|
43 | rtems_rtl_elf_arch_parse_section (const rtems_rtl_obj* obj, |
---|
44 | int section, |
---|
45 | const char* name, |
---|
46 | const Elf_Shdr* shdr, |
---|
47 | const uint32_t flags) |
---|
48 | { |
---|
49 | (void) obj; |
---|
50 | (void) section; |
---|
51 | (void) name; |
---|
52 | (void) shdr; |
---|
53 | return flags; |
---|
54 | } |
---|
55 | |
---|
56 | bool |
---|
57 | rtems_rtl_elf_arch_section_alloc (const rtems_rtl_obj* obj, |
---|
58 | rtems_rtl_obj_sect* sect) |
---|
59 | { |
---|
60 | (void) obj; |
---|
61 | (void) sect; |
---|
62 | return false; |
---|
63 | } |
---|
64 | |
---|
65 | bool |
---|
66 | rtems_rtl_elf_arch_section_free (const rtems_rtl_obj* obj, |
---|
67 | rtems_rtl_obj_sect* sect) |
---|
68 | { |
---|
69 | (void) obj; |
---|
70 | (void) sect; |
---|
71 | return false; |
---|
72 | } |
---|
73 | |
---|
74 | bool |
---|
75 | rtems_rtl_elf_rel_resolve_sym (Elf_Word type) |
---|
76 | { |
---|
77 | return true; |
---|
78 | } |
---|
79 | |
---|
80 | size_t |
---|
81 | rtems_rtl_elf_relocate_tramp_max_size (void) |
---|
82 | { |
---|
83 | /* |
---|
84 | * Disable by returning 0. |
---|
85 | */ |
---|
86 | return 0; |
---|
87 | } |
---|
88 | |
---|
89 | rtems_rtl_elf_rel_status |
---|
90 | rtems_rtl_elf_relocate_rela_tramp (rtems_rtl_obj* obj, |
---|
91 | const Elf_Rela* rela, |
---|
92 | const rtems_rtl_obj_sect* sect, |
---|
93 | const char* symname, |
---|
94 | const Elf_Byte syminfo, |
---|
95 | const Elf_Word symvalue) |
---|
96 | { |
---|
97 | (void) obj; |
---|
98 | (void) rela; |
---|
99 | (void) sect; |
---|
100 | (void) symname; |
---|
101 | (void) syminfo; |
---|
102 | (void) symvalue; |
---|
103 | return rtems_rtl_elf_rel_no_error; |
---|
104 | } |
---|
105 | |
---|
106 | rtems_rtl_elf_rel_status |
---|
107 | rtems_rtl_elf_relocate_rela (rtems_rtl_obj* obj, |
---|
108 | const Elf_Rela* rela, |
---|
109 | const rtems_rtl_obj_sect* sect, |
---|
110 | const char* symnane, |
---|
111 | const Elf_Byte syminfo, |
---|
112 | const Elf_Word symvalue) |
---|
113 | { |
---|
114 | Elf_Addr target = 0; |
---|
115 | Elf_Addr* where; |
---|
116 | Elf_Word tmp; |
---|
117 | |
---|
118 | where = (Elf_Addr *)(sect->base + rela->r_offset); |
---|
119 | |
---|
120 | switch (ELF_R_TYPE(rela->r_info)) { |
---|
121 | case R_TYPE(NONE): |
---|
122 | break; |
---|
123 | |
---|
124 | case R_TYPE(PC8): |
---|
125 | tmp = symvalue + rela->r_addend - (Elf_Addr)where; |
---|
126 | if (overflow_8_check(tmp)) |
---|
127 | return rtems_rtl_elf_rel_failure; |
---|
128 | |
---|
129 | *(uint8_t *)where = tmp; |
---|
130 | |
---|
131 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
---|
132 | printf ("rtl: reloc R_TYPE_8/PC8 in %s --> %p (%p) in %s\n", |
---|
133 | sect->name, (void*) (symvalue + rela->r_addend), |
---|
134 | (void *)*where, rtems_rtl_obj_oname (obj)); |
---|
135 | break; |
---|
136 | |
---|
137 | case R_TYPE(PC16): |
---|
138 | tmp = symvalue + rela->r_addend - (Elf_Addr)where; |
---|
139 | if (overflow_16_check(tmp)) |
---|
140 | return rtems_rtl_elf_rel_failure; |
---|
141 | |
---|
142 | *(uint16_t*)where = tmp; |
---|
143 | |
---|
144 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
---|
145 | printf ("rtl: reloc R_TYPE_16/PC16 in %s --> %p (%p) in %s\n", |
---|
146 | sect->name, (void*) (symvalue + rela->r_addend), |
---|
147 | (void *)*where, rtems_rtl_obj_oname (obj)); |
---|
148 | break; |
---|
149 | case R_TYPE(PC32): |
---|
150 | target = (Elf_Addr) symvalue + rela->r_addend; |
---|
151 | *where += target - (Elf_Addr)where; |
---|
152 | |
---|
153 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
---|
154 | printf ("rtl: reloc PC32 in %s --> %p (%p) in %s\n", |
---|
155 | sect->name, (void*) (symvalue + rela->r_addend), |
---|
156 | (void *)*where, rtems_rtl_obj_oname (obj)); |
---|
157 | break; |
---|
158 | |
---|
159 | case R_TYPE(GOT32): |
---|
160 | case R_TYPE(32): |
---|
161 | case R_TYPE(GLOB_DAT): |
---|
162 | target = (Elf_Addr) symvalue + rela->r_addend; |
---|
163 | |
---|
164 | if (*where != target) |
---|
165 | *where = target; |
---|
166 | |
---|
167 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
---|
168 | printf ("rtl: reloc 32/GLOB_DAT in %s --> %p in %s\n", |
---|
169 | sect->name, (void *)*where, |
---|
170 | rtems_rtl_obj_oname (obj)); |
---|
171 | break; |
---|
172 | |
---|
173 | case R_TYPE(RELATIVE): |
---|
174 | *where += (Elf_Addr) sect->base + rela->r_addend; |
---|
175 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
---|
176 | printf ("rtl: reloc RELATIVE in %s --> %p\n", |
---|
177 | rtems_rtl_obj_oname (obj), (void *)*where); |
---|
178 | break; |
---|
179 | |
---|
180 | case R_TYPE(COPY): |
---|
181 | /* |
---|
182 | * These are deferred until all other relocations have |
---|
183 | * been done. All we do here is make sure that the |
---|
184 | * COPY relocation is not in a shared library. They |
---|
185 | * are allowed only in executable files. |
---|
186 | */ |
---|
187 | printf ("rtl: reloc COPY (please report)\n"); |
---|
188 | break; |
---|
189 | |
---|
190 | default: |
---|
191 | printf ("rtl: reloc unknown: sym = %u, type = %u, offset = %p, " |
---|
192 | "contents = %p\n", |
---|
193 | ELF_R_SYM(rela->r_info), (uint32_t) ELF_R_TYPE(rela->r_info), |
---|
194 | (void *)rela->r_offset, (void *)*where); |
---|
195 | rtems_rtl_set_error (EINVAL, |
---|
196 | "%s: Unsupported relocation type %d " |
---|
197 | "in non-PLT relocations", |
---|
198 | sect->name, (uint32_t) ELF_R_TYPE(rela->r_info)); |
---|
199 | return rtems_rtl_elf_rel_failure; |
---|
200 | } |
---|
201 | |
---|
202 | return rtems_rtl_elf_rel_no_error; |
---|
203 | } |
---|
204 | |
---|
205 | rtems_rtl_elf_rel_status |
---|
206 | rtems_rtl_elf_relocate_rel_tramp (rtems_rtl_obj* obj, |
---|
207 | const Elf_Rel* rel, |
---|
208 | const rtems_rtl_obj_sect* sect, |
---|
209 | const char* symname, |
---|
210 | const Elf_Byte syminfo, |
---|
211 | const Elf_Word symvalue) |
---|
212 | { |
---|
213 | (void) obj; |
---|
214 | (void) rel; |
---|
215 | (void) sect; |
---|
216 | (void) symname; |
---|
217 | (void) syminfo; |
---|
218 | (void) symvalue; |
---|
219 | rtems_rtl_set_error (EINVAL, "rel type record not supported"); |
---|
220 | return rtems_rtl_elf_rel_failure; |
---|
221 | } |
---|
222 | |
---|
223 | rtems_rtl_elf_rel_status |
---|
224 | rtems_rtl_elf_relocate_rel (rtems_rtl_obj* obj, |
---|
225 | const Elf_Rel* rel, |
---|
226 | const rtems_rtl_obj_sect* sect, |
---|
227 | const char* symname, |
---|
228 | const Elf_Byte syminfo, |
---|
229 | const Elf_Word symvalue) |
---|
230 | { |
---|
231 | (void) obj; |
---|
232 | (void) rel; |
---|
233 | (void) sect; |
---|
234 | (void) symname; |
---|
235 | (void) syminfo; |
---|
236 | (void) symvalue; |
---|
237 | rtems_rtl_set_error (EINVAL, "rel type record not supported"); |
---|
238 | return rtems_rtl_elf_rel_failure; |
---|
239 | } |
---|
240 | |
---|
241 | bool |
---|
242 | rtems_rtl_elf_unwind_parse (const rtems_rtl_obj* obj, |
---|
243 | const char* name, |
---|
244 | uint32_t flags) |
---|
245 | { |
---|
246 | return rtems_rtl_elf_unwind_dw2_parse (obj, name, flags); |
---|
247 | } |
---|
248 | |
---|
249 | bool |
---|
250 | rtems_rtl_elf_unwind_register (rtems_rtl_obj* obj) |
---|
251 | { |
---|
252 | return rtems_rtl_elf_unwind_dw2_register (obj); |
---|
253 | } |
---|
254 | |
---|
255 | bool |
---|
256 | rtems_rtl_elf_unwind_deregister (rtems_rtl_obj* obj) |
---|
257 | { |
---|
258 | return rtems_rtl_elf_unwind_dw2_deregister (obj); |
---|
259 | } |
---|