summaryrefslogtreecommitdiff
path: root/cpukit/libdl/rtl-mdreloc-mips.c
blob: c37804880fe8e77047d94fc374f2fba2bc3828dc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
#include <sys/cdefs.h>

#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <rtems/rtl/rtl.h>
#include "rtl-elf.h"
#include "rtl-error.h"
#include <rtems/rtl/rtl-trace.h>
#include "rtl-unwind.h"
#include "rtl-unwind-dw2.h"

uint32_t
rtems_rtl_elf_section_flags (const rtems_rtl_obj* obj,
                             const Elf_Shdr*      shdr)
{
  return 0;
}

uint32_t
rtems_rtl_elf_arch_parse_section (const rtems_rtl_obj* obj,
                                  int                  section,
                                  const char*          name,
                                  const Elf_Shdr*      shdr,
                                  const uint32_t       flags)
{
  (void) obj;
  (void) section;
  (void) name;
  (void) shdr;
  return flags;
}

bool
rtems_rtl_elf_arch_section_alloc (const rtems_rtl_obj* obj,
                                  rtems_rtl_obj_sect*  sect)
{
  (void) obj;
  (void) sect;
  return false;
}

bool
rtems_rtl_elf_arch_section_free (const rtems_rtl_obj* obj,
                                  rtems_rtl_obj_sect*  sect)
{
  (void) obj;
  (void) sect;
  return false;
}

bool
rtems_rtl_elf_rel_resolve_sym (Elf_Word type)
{
  return true;
}

size_t
rtems_rtl_elf_relocate_tramp_max_size (void)
{
  /*
   * Disable by returning 0.
   */
  return 0;
}

rtems_rtl_elf_rel_status
rtems_rtl_elf_relocate_rela_tramp (rtems_rtl_obj*            obj,
                                   const Elf_Rela*           rela,
                                   const rtems_rtl_obj_sect* sect,
                                   const char*               symname,
                                   const Elf_Byte            syminfo,
                                   const Elf_Word            symvalue)
{
  (void) obj;
  (void) rela;
  (void) sect;
  (void) symname;
  (void) syminfo;
  (void) symvalue;
  rtems_rtl_set_error (EINVAL, "rela type record not supported");
  return rtems_rtl_elf_rel_failure;
}

rtems_rtl_elf_rel_status
rtems_rtl_elf_relocate_rela (rtems_rtl_obj*            obj,
                             const Elf_Rela*           rela,
                             const rtems_rtl_obj_sect* sect,
                             const char*               symname,
                             const Elf_Byte            syminfo,
                             const Elf_Word            symvalue)
{
  (void) obj;
  (void) rela;
  (void) sect;
  (void) symname;
  (void) syminfo;
  (void) symvalue;
  rtems_rtl_set_error (EINVAL, "rela type record not supported");
  return rtems_rtl_elf_rel_failure;
}

rtems_rtl_elf_rel_status
rtems_rtl_elf_relocate_rel_tramp (rtems_rtl_obj*            obj,
                                  const Elf_Rel*            rel,
                                  const rtems_rtl_obj_sect* sect,
                                  const char*               symname,
                                  const Elf_Byte            syminfo,
                                  const Elf_Word            symvalue)
{
  (void) obj;
  (void) rel;
  (void) sect;
  (void) symname;
  (void) syminfo;
  (void) symvalue;
  return rtems_rtl_elf_rel_no_error;
}

/*
 * 1. _gp_disp symbol are not considered in this file.
 * 2. There is a local/external column;
 * local corresponds to (STB_LOCAL & STT_SECTION) and
 * all others are external. Because if the type of a
 * symbol is STT_SECTION, it must be STB_LOCAL. Thus
 * just consider symtype here.
 */
rtems_rtl_elf_rel_status
rtems_rtl_elf_relocate_rel (rtems_rtl_obj*            obj,
                            const Elf_Rel*            rel,
                            const rtems_rtl_obj_sect* sect,
                            const char*               symname,
                            const Elf_Byte            syminfo,
                            const Elf_Word            symvalue)
{
  Elf_Addr *where;
  Elf_Word  tmp;
  Elf_Word addend = (Elf_Word)0;
  Elf_Word local = 0;
  uint32_t t;


  static Elf_Addr *where_hi16;
  static Elf_Addr ahl;

  where = (Elf_Addr *)(sect->base + rel->r_offset);
  addend = *where;

  if (syminfo == STT_SECTION)
    local = 1;

  switch (ELF_R_TYPE(rel->r_info)) {
    case R_TYPE(NONE):
      break;

    case R_TYPE(16):
      tmp = addend & 0xffff;
      if ((tmp & 0x8000) == 0x8000)
        tmp |= 0xffff0000; /* Sign extend */
      tmp = symvalue + (int)tmp;
      if ((tmp & 0xffff0000) != 0) {
        printf("R_MIPS_16 Overflow\n");
        return rtems_rtl_elf_rel_failure;
      }

      *where = (tmp & 0xffff) | (*where & 0xffff0000);

      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
        printf ("rtl: R_MIPS_16 %p @ %p in %s\n",
                (void *)*(where), where, rtems_rtl_obj_oname (obj));
      break;

    case R_TYPE(32):
      tmp = symvalue + addend;
      if (addend != tmp)
        *where = tmp;

      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
        printf ("rtl: R_MIPS_32 %p @ %p in %s\n",
                (void *)*(where), where, rtems_rtl_obj_oname (obj));
      break;

    case R_TYPE(26):

        addend &= 0x03ffffff;
        addend <<= 2;

      if (local == 1) { /* STB_LOCAL and STT_SECTION */
        tmp = symvalue + (((Elf_Addr)where & 0xf0000000) | addend);
        tmp >>= 2;

      } else { /* external */

        tmp = addend;

        if ((tmp & 0x08000000) == 0x08000000)
          tmp |= 0xf0000000; /* Sign extened */
        tmp = ((int)tmp + symvalue) >> 2;

      }

      *where &= ~0x03ffffff;
      *where |= tmp & 0x03ffffff;

      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
        printf ("rtl: R_MIPS_26 local=%lu @ %p in %s\n",
                local, (void *)*(where), rtems_rtl_obj_oname (obj));
      break;

    case R_TYPE(HI16):
      ahl = addend << 16;
      where_hi16 = where;


      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
        printf ("rtl: R_MIPS_HI16 %p @ %p in %s\n",
                (void *)*(where), where, rtems_rtl_obj_oname (obj));
      break;

    case R_TYPE(LO16):
      //ahl += (int16_t)addend;
      t = ahl + (int16_t)addend;
      tmp = symvalue;
      if (tmp == 0)
        return rtems_rtl_elf_rel_failure;

      addend &= 0xffff0000;
      addend |= (uint16_t)(t + tmp);
      *where = addend;

      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
        printf("*where %lx where %p\n", *where, where);

      addend = *where_hi16;
      addend &= 0xffff0000;
      addend |= ((t + tmp) - (int16_t)(t + tmp)) >> 16;
      *where_hi16 = addend;

      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
        printf("*where_hi %lx where_hi %p\n", *where_hi16, where_hi16);

      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
        printf ("rtl: R_MIPS_LO16 %p @ %p in %s\n",
                (void *)*(where), where, rtems_rtl_obj_oname (obj));
      break;

    case R_TYPE(PC16):
      tmp = addend & 0xffff;
      if ((tmp & 0x8000) == 0x8000)
        tmp |= 0xffff0000; /* Sign extend */
      tmp = symvalue + ((int)tmp*4) - (Elf_Addr)where;
      tmp = (Elf_Sword)tmp >> 2;
      if (((Elf_Sword)tmp > 0x7fff) || ((Elf_Sword)tmp < -0x8000)) {
        printf("R_MIPS_PC16 Overflow\n");
        return rtems_rtl_elf_rel_failure;
      }

      *where = (tmp & 0xffff) | (*where & 0xffff0000);

      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
        printf ("rtl: R_MIPS_PC16 %p @ %p in %s\n",
                (void *)*(where), where, rtems_rtl_obj_oname (obj));

      break;

    default:
      printf ("rtl: reloc unknown: sym = %lu, type = %lu, offset = %p, "
              "contents = %p\n",
              ELF_R_SYM(rel->r_info), (uint32_t) ELF_R_TYPE(rel->r_info),
              (void *)rel->r_offset, (void *)*where);
      rtems_rtl_set_error (EINVAL,
                           "%s: Unsupported relocation type %ld "
                           "in non-PLT relocations",
                           sect->name, (uint32_t) ELF_R_TYPE(rel->r_info));
      return rtems_rtl_elf_rel_failure;
  }

  return rtems_rtl_elf_rel_no_error;
}

bool
rtems_rtl_elf_unwind_parse (const rtems_rtl_obj* obj,
                            const char*          name,
                            uint32_t             flags)
{
  return rtems_rtl_elf_unwind_dw2_parse (obj, name, flags);
}

bool
rtems_rtl_elf_unwind_register (rtems_rtl_obj* obj)
{
  return rtems_rtl_elf_unwind_dw2_register (obj);
}

bool
rtems_rtl_elf_unwind_deregister (rtems_rtl_obj* obj)
{
  return rtems_rtl_elf_unwind_dw2_deregister (obj);
}