1/* picoJava specific support for 32-bit ELF
2   Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
3   Contributed by Steve Chamberlan of Transmeta (sac@pobox.com).
4
5This file is part of BFD, the Binary File Descriptor library.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
19Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
20
21#include "bfd.h"
22#include "sysdep.h"
23#include "bfdlink.h"
24#include "libbfd.h"
25#include "elf-bfd.h"
26#include "elf/pj.h"
27
28static bfd_reloc_status_type pj_elf_reloc
29  PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
30static reloc_howto_type *pj_elf_reloc_type_lookup
31  PARAMS ((bfd *, bfd_reloc_code_real_type));
32static void pj_elf_info_to_howto
33  PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
34static void pj_elf_final_write_processing
35  PARAMS ((bfd *, bfd_boolean));
36
37static reloc_howto_type pj_elf_howto_table[] =
38{
39  /* No relocation.  */
40  HOWTO (R_PJ_NONE,		/* type */
41	 0,			/* rightshift */
42	 0,			/* size (0 = byte, 1 = short, 2 = long) */
43	 0,			/* bitsize */
44	 FALSE,			/* pc_relative */
45	 0,			/* bitpos */
46	 complain_overflow_dont, /* complain_on_overflow */
47	 pj_elf_reloc,		/* special_function */
48	 "R_PJ_NONE",		/* name */
49	 FALSE,			/* partial_inplace */
50	 0,			/* src_mask */
51	 0,			/* dst_mask */
52	 FALSE),		/* pcrel_offset */
53
54  /* 32 bit absolute relocation.  Setting partial_inplace to TRUE and
55     src_mask to a non-zero value is similar to the COFF toolchain.  */
56  HOWTO (R_PJ_DATA_DIR32,		/* type */
57	 0,			/* rightshift */
58	 2,			/* size (0 = byte, 1 = short, 2 = long) */
59	 32,			/* bitsize */
60	 FALSE,			/* pc_relative */
61	 0,			/* bitpos */
62	 complain_overflow_bitfield, /* complain_on_overflow */
63	 pj_elf_reloc,		/* special_function */
64	 "R_PJ_DIR32",		/* name */
65	 TRUE,			/* partial_inplace */
66	 0xffffffff,		/* src_mask */
67	 0xffffffff,		/* dst_mask */
68	 FALSE),		/* pcrel_offset */
69
70  /* 32 bit PC relative relocation.  */
71  HOWTO (R_PJ_CODE_REL32,		/* type */
72	 0,			/* rightshift */
73	 2,			/* size (0 = byte, 1 = short, 2 = long) */
74	 32,			/* bitsize */
75	 TRUE,			/* pc_relative */
76	 0,			/* bitpos */
77	 complain_overflow_signed, /* complain_on_overflow */
78	 pj_elf_reloc,		/* special_function */
79	 "R_PJ_REL32",		/* name */
80	 FALSE,			/* partial_inplace */
81	 0,			/* src_mask */
82	 0xffffffff,		/* dst_mask */
83	 TRUE),			/* pcrel_offset */
84
85/* 16 bit PC relative relocation.  */
86  HOWTO (R_PJ_CODE_REL16,		/* type */
87	 0,			/* rightshift */
88	 1,			/* size (0 = byte, 1 = short, 2 = long) */
89	 16,			/* bitsize */
90	 TRUE,			/* pc_relative */
91	 0,			/* bitpos */
92	 complain_overflow_signed, /* complain_on_overf6w */
93	 pj_elf_reloc,		/* special_function */
94	 "R_PJ_REL16",		/* name */
95	 FALSE,			/* partial_inplace */
96	 0xffff,		/* src_mask */
97	 0xffff,		/* dst_mask */
98	 TRUE),			/* pcrel_offset */
99  EMPTY_HOWTO (4),
100  EMPTY_HOWTO (5),
101  HOWTO (R_PJ_CODE_DIR32,	/* type */
102	 0,			/* rightshift */
103	 2,			/* size (0 = byte, 1 = short, 2 = long) */
104	 32,			/* bitsize */
105	 FALSE,			/* pc_relative */
106	 0,			/* bitpos */
107	 complain_overflow_bitfield, /* complain_on_overflow */
108	 pj_elf_reloc,		/* special_function */
109	 "R_PJ_CODE_DIR32",	/* name */
110	 TRUE,			/* partial_inplace */
111	 0xffffffff,		/* src_mask */
112	 0xffffffff,		/* dst_mask */
113	 FALSE),		/* pcrel_offset */
114
115  EMPTY_HOWTO (7),
116  EMPTY_HOWTO (8),
117  EMPTY_HOWTO (9),
118  EMPTY_HOWTO (10),
119  EMPTY_HOWTO (11),
120  EMPTY_HOWTO (12),
121
122  HOWTO (R_PJ_CODE_LO16,	/* type */
123	 0,			/* rightshift */
124	 1,			/* size (0 = byte, 1 = short, 2 = long) */
125	 16,			/* bitsize */
126	 FALSE,			/* pc_relative */
127	 0,			/* bitpos */
128	 complain_overflow_unsigned, /* complain_on_overflow */
129	 pj_elf_reloc,		/* special_function */
130	 "R_PJ_LO16",		/* name */
131	 FALSE,			/* partial_inplace */
132	 0xffff,		/* src_mask */
133	 0xffff,		/* dst_mask */
134	 TRUE),			/* pcrel_offset */
135
136    HOWTO (R_PJ_CODE_HI16,	/* type */
137	 16,			/* rightshift */
138	 1,			/* size (0 = byte, 1 = short, 2 = long) */
139	 16,			/* bitsize */
140	 FALSE,			/* pc_relative */
141	 0,			/* bitpos */
142	 complain_overflow_unsigned, /* complain_on_overflow */
143	 pj_elf_reloc,		/* special_function */
144	 "R_PJ_HI16",		/* name */
145	 FALSE,			/* partial_inplace */
146	 0xffff,		/* src_mask */
147	 0xffff,		/* dst_mask */
148	 TRUE),			/* pcrel_offset */
149
150  /* GNU extension to record C++ vtable hierarchy */
151  HOWTO (R_PJ_GNU_VTINHERIT,    /* type */
152         0,                     /* rightshift */
153         2,                     /* size (0 = byte, 1 = short, 2 = long) */
154         0,                     /* bitsize */
155         FALSE,                 /* pc_relative */
156         0,                     /* bitpos */
157         complain_overflow_dont, /* complain_on_overflow */
158         NULL,                  /* special_function */
159         "R_PJ_GNU_VTINHERIT",  /* name */
160         FALSE,                 /* partial_inplace */
161         0,                     /* src_mask */
162         0,                     /* dst_mask */
163         FALSE),                /* pcrel_offset */
164
165  /* GNU extension to record C++ vtable member usage */
166  HOWTO (R_PJ_GNU_VTENTRY,     /* type */
167         0,                     /* rightshift */
168         2,                     /* size (0 = byte, 1 = short, 2 = long) */
169         0,                     /* bitsize */
170         FALSE,                 /* pc_relative */
171         0,                     /* bitpos */
172         complain_overflow_dont, /* complain_on_overflow */
173         _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
174         "R_PJ_GNU_VTENTRY",   /* name */
175         FALSE,                 /* partial_inplace */
176         0,                     /* src_mask */
177         0,                     /* dst_mask */
178         FALSE),                /* pcrel_offset */
179};
180
181/* This function is used for normal relocs.  This is like the COFF
182   function, and is almost certainly incorrect for other ELF targets.  */
183
184static bfd_reloc_status_type
185pj_elf_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd,
186	  error_message)
187     bfd *abfd;
188     arelent *reloc_entry;
189     asymbol *symbol_in;
190     PTR data;
191     asection *input_section;
192     bfd *output_bfd;
193     char **error_message ATTRIBUTE_UNUSED;
194{
195  unsigned long insn;
196  bfd_vma sym_value;
197  enum elf_pj_reloc_type r_type;
198  bfd_vma addr = reloc_entry->address;
199  bfd_byte *hit_data = addr + (bfd_byte *) data;
200
201  r_type = (enum elf_pj_reloc_type) reloc_entry->howto->type;
202
203  if (output_bfd != NULL)
204    {
205      /* Partial linking--do nothing.  */
206      reloc_entry->address += input_section->output_offset;
207      return bfd_reloc_ok;
208    }
209
210  if (symbol_in != NULL
211      && bfd_is_und_section (symbol_in->section))
212    return bfd_reloc_undefined;
213
214  if (bfd_is_com_section (symbol_in->section))
215    sym_value = 0;
216  else
217    sym_value = (symbol_in->value +
218		 symbol_in->section->output_section->vma +
219		 symbol_in->section->output_offset);
220
221  switch (r_type)
222    {
223    case R_PJ_DATA_DIR32:
224      insn = bfd_get_32 (abfd, hit_data);
225      insn += sym_value + reloc_entry->addend;
226      bfd_put_32 (abfd, (bfd_vma) insn, hit_data);
227      break;
228
229      /* Relocations in code are always bigendian, no matter what the
230	 data endianness is.  */
231
232    case R_PJ_CODE_DIR32:
233      insn = bfd_getb32 (hit_data);
234      insn += sym_value + reloc_entry->addend;
235      bfd_putb32 ((bfd_vma) insn, hit_data);
236      break;
237
238    case R_PJ_CODE_REL16:
239      insn = bfd_getb16 (hit_data);
240      insn += sym_value + reloc_entry->addend
241        -  (input_section->output_section->vma
242            + input_section->output_offset);
243      bfd_putb16 ((bfd_vma) insn, hit_data);
244      break;
245    case R_PJ_CODE_LO16:
246      insn = bfd_getb16 (hit_data);
247      insn += sym_value + reloc_entry->addend;
248      bfd_putb16 ((bfd_vma) insn, hit_data);
249      break;
250
251    case R_PJ_CODE_HI16:
252      insn = bfd_getb16 (hit_data);
253      insn += (sym_value + reloc_entry->addend) >> 16;
254      bfd_putb16 ((bfd_vma) insn, hit_data);
255      break;
256
257    default:
258      abort ();
259      break;
260    }
261
262  return bfd_reloc_ok;
263}
264
265/* This structure is used to map BFD reloc codes to PJ ELF relocs.  */
266
267struct elf_reloc_map
268{
269  bfd_reloc_code_real_type bfd_reloc_val;
270  unsigned char elf_reloc_val;
271};
272
273/* An array mapping BFD reloc codes to PJ ELF relocs.  */
274
275static const struct elf_reloc_map pj_reloc_map[] =
276{
277    { BFD_RELOC_NONE, 		R_PJ_NONE          },
278    { BFD_RELOC_32, 		R_PJ_DATA_DIR32    },
279    { BFD_RELOC_PJ_CODE_DIR16, 	R_PJ_CODE_DIR16    },
280    { BFD_RELOC_PJ_CODE_DIR32, 	R_PJ_CODE_DIR32    },
281    { BFD_RELOC_PJ_CODE_LO16, 	R_PJ_CODE_LO16     },
282    { BFD_RELOC_PJ_CODE_HI16, 	R_PJ_CODE_HI16     },
283    { BFD_RELOC_PJ_CODE_REL32,  R_PJ_CODE_REL32    },
284    { BFD_RELOC_PJ_CODE_REL16,  R_PJ_CODE_REL16    },
285    { BFD_RELOC_VTABLE_INHERIT, R_PJ_GNU_VTINHERIT },
286    { BFD_RELOC_VTABLE_ENTRY,   R_PJ_GNU_VTENTRY   },
287};
288
289/* Given a BFD reloc code, return the howto structure for the
290   corresponding PJ ELf reloc.  */
291
292static reloc_howto_type *
293pj_elf_reloc_type_lookup (abfd, code)
294     bfd *abfd ATTRIBUTE_UNUSED;
295     bfd_reloc_code_real_type code;
296{
297  unsigned int i;
298
299  for (i = 0; i < sizeof (pj_reloc_map) / sizeof (struct elf_reloc_map); i++)
300    {
301      if (pj_reloc_map[i].bfd_reloc_val == code)
302	return &pj_elf_howto_table[(int) pj_reloc_map[i].elf_reloc_val];
303    }
304
305  return NULL;
306}
307
308/* Given an ELF reloc, fill in the howto field of a relent.  */
309
310static void
311pj_elf_info_to_howto (abfd, cache_ptr, dst)
312     bfd *abfd ATTRIBUTE_UNUSED;
313     arelent *cache_ptr;
314     Elf_Internal_Rela *dst;
315{
316  unsigned int r;
317
318  r = ELF32_R_TYPE (dst->r_info);
319
320  BFD_ASSERT (r < (unsigned int) R_PJ_max);
321
322  cache_ptr->howto = &pj_elf_howto_table[r];
323}
324
325/* Take this moment to fill in the special picoJava bits in the
326   e_flags field.  */
327
328static void
329pj_elf_final_write_processing (abfd, linker)
330     bfd *abfd;
331     bfd_boolean linker ATTRIBUTE_UNUSED;
332{
333    elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_ARCH;
334    elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_GNUCALLS;
335}
336
337#define TARGET_BIG_SYM		bfd_elf32_pj_vec
338#define TARGET_BIG_NAME		"elf32-pj"
339#define TARGET_LITTLE_SYM	bfd_elf32_pjl_vec
340#define TARGET_LITTLE_NAME	"elf32-pjl"
341#define ELF_ARCH		bfd_arch_pj
342#define ELF_MACHINE_CODE	EM_PJ
343#define ELF_MACHINE_ALT1	EM_PJ_OLD
344#define ELF_MAXPAGESIZE		0x1000
345#define bfd_elf32_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
346#define bfd_elf32_bfd_reloc_type_lookup	             pj_elf_reloc_type_lookup
347#define elf_backend_final_write_processing           pj_elf_final_write_processing
348#define elf_info_to_howto		             pj_elf_info_to_howto
349#include "elf32-target.h"
350