1/* BFD back-end for Zilog Z800n COFF binaries.
2   Copyright (C) 1992-2017 Free Software Foundation, Inc.
3   Contributed by Cygnus Support.
4   Written by Steve Chamberlain, <sac@cygnus.com>.
5
6   This file is part of BFD, the Binary File Descriptor library.
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 3 of the License, or
11   (at your option) any later version.
12
13   This program is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with this program; if not, write to the Free Software
20   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21   MA 02110-1301, USA.  */
22
23#include "sysdep.h"
24#include "bfd.h"
25#include "libbfd.h"
26#include "bfdlink.h"
27#include "coff/z8k.h"
28#include "coff/internal.h"
29#include "libcoff.h"
30
31#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
32
33static reloc_howto_type r_imm32 =
34HOWTO (R_IMM32, 0, 2, 32, FALSE, 0,
35       complain_overflow_bitfield, 0, "r_imm32", TRUE, 0xffffffff,
36       0xffffffff, FALSE);
37
38static reloc_howto_type r_imm4l =
39HOWTO (R_IMM4L, 0, 0, 4, FALSE, 0,
40       complain_overflow_bitfield, 0, "r_imm4l", TRUE, 0xf, 0xf, FALSE);
41
42static reloc_howto_type r_da =
43HOWTO (R_IMM16, 0, 1, 16, FALSE, 0,
44       complain_overflow_bitfield, 0, "r_da", TRUE, 0x0000ffff, 0x0000ffff,
45       FALSE);
46
47static reloc_howto_type r_imm8 =
48HOWTO (R_IMM8, 0, 0, 8, FALSE, 0,
49       complain_overflow_bitfield, 0, "r_imm8", TRUE, 0x000000ff, 0x000000ff,
50       FALSE);
51
52static reloc_howto_type r_rel16 =
53HOWTO (R_REL16, 0, 1, 16, FALSE, 0,
54       complain_overflow_bitfield, 0, "r_rel16", TRUE, 0x0000ffff, 0x0000ffff,
55       TRUE);
56
57static reloc_howto_type r_jr =
58HOWTO (R_JR, 1, 0, 8, TRUE, 0, complain_overflow_signed, 0,
59       "r_jr", TRUE, 0xff, 0xff, TRUE);
60
61static reloc_howto_type r_disp7 =
62HOWTO (R_DISP7, 0, 0, 7, TRUE, 0, complain_overflow_bitfield, 0,
63       "r_disp7", TRUE, 0x7f, 0x7f, TRUE);
64
65static reloc_howto_type r_callr =
66HOWTO (R_CALLR, 1, 1, 12, TRUE, 0, complain_overflow_signed, 0,
67       "r_callr", TRUE, 0xfff, 0xfff, TRUE);
68
69#define BADMAG(x) Z8KBADMAG(x)
70#define Z8K 1			/* Customize coffcode.h.  */
71#define __A_MAGIC_SET__
72
73/* Code to swap in the reloc.  */
74#define SWAP_IN_RELOC_OFFSET	H_GET_32
75#define SWAP_OUT_RELOC_OFFSET	H_PUT_32
76#define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
77  dst->r_stuff[0] = 'S'; \
78  dst->r_stuff[1] = 'C';
79
80/* Code to turn a r_type into a howto ptr, uses the above howto table.  */
81
82static void
83rtype2howto (arelent *internal, struct internal_reloc *dst)
84{
85  switch (dst->r_type)
86    {
87    default:
88      internal->howto = NULL;
89      break;
90    case R_IMM8:
91      internal->howto = &r_imm8;
92      break;
93     case R_IMM16:
94      internal->howto = &r_da;
95      break;
96    case R_JR:
97      internal->howto = &r_jr;
98      break;
99    case R_DISP7:
100      internal->howto = &r_disp7;
101      break;
102    case R_CALLR:
103      internal->howto = &r_callr;
104      break;
105    case R_REL16:
106      internal->howto = &r_rel16;
107      break;
108    case R_IMM32:
109      internal->howto = &r_imm32;
110      break;
111    case R_IMM4L:
112      internal->howto = &r_imm4l;
113      break;
114    }
115}
116
117#define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
118
119static reloc_howto_type *
120coff_z8k_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
121                            bfd_reloc_code_real_type code)
122{
123  switch (code)
124    {
125    case BFD_RELOC_8:      	return & r_imm8;
126    case BFD_RELOC_16:      	return & r_da;
127    case BFD_RELOC_32:      	return & r_imm32;
128    case BFD_RELOC_8_PCREL:     return & r_jr;
129    case BFD_RELOC_16_PCREL:    return & r_rel16;
130    case BFD_RELOC_Z8K_DISP7:   return & r_disp7;
131    case BFD_RELOC_Z8K_CALLR:   return & r_callr;
132    case BFD_RELOC_Z8K_IMM4L:   return & r_imm4l;
133    default:			BFD_FAIL ();
134      return 0;
135    }
136}
137
138static reloc_howto_type *
139coff_z8k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
140			    const char *r_name)
141{
142  if (strcasecmp (r_imm8.name, r_name) == 0)
143    return &r_imm8;
144  if (strcasecmp (r_da.name, r_name) == 0)
145    return &r_da;
146  if (strcasecmp (r_imm32.name, r_name) == 0)
147    return &r_imm32;
148  if (strcasecmp (r_jr.name, r_name) == 0)
149    return &r_jr;
150  if (strcasecmp (r_rel16.name, r_name) == 0)
151    return &r_rel16;
152  if (strcasecmp (r_disp7.name, r_name) == 0)
153    return &r_disp7;
154  if (strcasecmp (r_callr.name, r_name) == 0)
155    return &r_callr;
156  if (strcasecmp (r_imm4l.name, r_name) == 0)
157    return &r_imm4l;
158
159  return NULL;
160}
161
162/* Perform any necessary magic to the addend in a reloc entry.  */
163
164#define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
165 cache_ptr->addend =  ext_reloc.r_offset;
166
167#define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
168 reloc_processing(relent, reloc, symbols, abfd, section)
169
170static void
171reloc_processing (arelent *relent,
172                  struct internal_reloc *reloc,
173                  asymbol **symbols,
174                  bfd *abfd,
175                  asection *section)
176{
177  relent->address = reloc->r_vaddr;
178  rtype2howto (relent, reloc);
179
180  if (reloc->r_symndx > 0)
181    relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
182  else
183    relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
184
185  relent->addend = reloc->r_offset;
186  relent->address -= section->vma;
187}
188
189static void
190extra_case (bfd *in_abfd,
191            struct bfd_link_info *link_info,
192            struct bfd_link_order *link_order,
193            arelent *reloc,
194            bfd_byte *data,
195            unsigned int *src_ptr,
196            unsigned int *dst_ptr)
197{
198  asection * input_section = link_order->u.indirect.section;
199
200  switch (reloc->howto->type)
201    {
202    case R_IMM8:
203      bfd_put_8 (in_abfd,
204		 bfd_coff_reloc16_get_value (reloc, link_info, input_section),
205		 data + *dst_ptr);
206      (*dst_ptr) += 1;
207      (*src_ptr) += 1;
208      break;
209
210    case R_IMM32:
211      /* If no flags are set, assume immediate value.  */
212      if (! (*reloc->sym_ptr_ptr)->section->flags)
213	{
214	  bfd_put_32 (in_abfd,
215		      bfd_coff_reloc16_get_value (reloc, link_info,
216						  input_section),
217		      data + *dst_ptr);
218	}
219      else
220	{
221	  bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
222						    input_section);
223	  /* Addresses are 23 bit, and the layout of those in a 32-bit
224	     value is as follows:
225	       1AAAAAAA xxxxxxxx AAAAAAAA AAAAAAAA
226	     (A - address bits,  x - ignore).  */
227	  dst = (dst & 0xffff) | ((dst & 0xff0000) << 8) | 0x80000000;
228	  bfd_put_32 (in_abfd, dst, data + *dst_ptr);
229	}
230      (*dst_ptr) += 4;
231      (*src_ptr) += 4;
232      break;
233
234    case R_IMM4L:
235      bfd_put_8 (in_abfd,
236		 ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
237		  | (0x0f
238		     & bfd_coff_reloc16_get_value (reloc, link_info,
239						   input_section))),
240		 data + *dst_ptr);
241      (*dst_ptr) += 1;
242      (*src_ptr) += 1;
243      break;
244
245    case R_IMM16:
246      bfd_put_16 (in_abfd,
247		  bfd_coff_reloc16_get_value (reloc, link_info, input_section),
248		  data + *dst_ptr);
249      (*dst_ptr) += 2;
250      (*src_ptr) += 2;
251      break;
252
253    case R_JR:
254      {
255	bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
256						  input_section);
257	bfd_vma dot = (*dst_ptr
258		       + input_section->output_offset
259		       + input_section->output_section->vma);
260	int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
261                                     word and the pc's been incremented.  */
262
263	if (gap & 1)
264	  abort ();
265	gap /= 2;
266	if (gap > 127 || gap < -128)
267	  (*link_info->callbacks->reloc_overflow)
268	    (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
269	     reloc->howto->name, reloc->addend, input_section->owner,
270	     input_section, reloc->address);
271
272	bfd_put_8 (in_abfd, gap, data + *dst_ptr);
273	(*dst_ptr)++;
274	(*src_ptr)++;
275	break;
276      }
277
278    case R_DISP7:
279      {
280	bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
281						  input_section);
282	bfd_vma dot = (*dst_ptr
283		       + input_section->output_offset
284		       + input_section->output_section->vma);
285	int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
286                                     word and the pc's been incremented.  */
287
288	if (gap & 1)
289	  abort ();
290	gap /= 2;
291
292	if (gap > 0 || gap < -127)
293	  (*link_info->callbacks->reloc_overflow)
294	    (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
295	     reloc->howto->name, reloc->addend, input_section->owner,
296	     input_section, reloc->address);
297
298	bfd_put_8 (in_abfd,
299                   (bfd_get_8 ( in_abfd, data + *dst_ptr) & 0x80) + (-gap & 0x7f),
300                   data + *dst_ptr);
301	(*dst_ptr)++;
302	(*src_ptr)++;
303	break;
304      }
305
306    case R_CALLR:
307      {
308	bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
309						  input_section);
310	bfd_vma dot = (*dst_ptr
311		       + input_section->output_offset
312		       + input_section->output_section->vma);
313	int gap = dst - dot - 2;
314
315	if (gap & 1)
316	  abort ();
317	if (gap > 4096 || gap < -4095)
318	  (*link_info->callbacks->reloc_overflow)
319	    (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
320	     reloc->howto->name, reloc->addend, input_section->owner,
321	     input_section, reloc->address);
322
323	gap /= 2;
324	bfd_put_16 (in_abfd,
325                    (bfd_get_16 ( in_abfd, data + *dst_ptr) & 0xf000) | (-gap & 0x0fff),
326                    data + *dst_ptr);
327	(*dst_ptr) += 2;
328	(*src_ptr) += 2;
329	break;
330      }
331
332    case R_REL16:
333      {
334	bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
335						  input_section);
336	bfd_vma dot = (*dst_ptr
337		       + input_section->output_offset
338		       + input_section->output_section->vma);
339	int gap = dst - dot - 2;
340
341	if (gap > 32767 || gap < -32768)
342	  (*link_info->callbacks->reloc_overflow)
343	    (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
344	     reloc->howto->name, reloc->addend, input_section->owner,
345	     input_section, reloc->address);
346
347	bfd_put_16 (in_abfd, (bfd_vma) gap, data + *dst_ptr);
348	(*dst_ptr) += 2;
349	(*src_ptr) += 2;
350	break;
351      }
352
353    default:
354      abort ();
355    }
356}
357
358#define coff_reloc16_extra_cases    extra_case
359#define coff_bfd_reloc_type_lookup  coff_z8k_reloc_type_lookup
360#define coff_bfd_reloc_name_lookup coff_z8k_reloc_name_lookup
361
362#ifndef bfd_pe_print_pdata
363#define bfd_pe_print_pdata	NULL
364#endif
365
366#include "coffcode.h"
367
368#undef  coff_bfd_get_relocated_section_contents
369#define coff_bfd_get_relocated_section_contents \
370  bfd_coff_reloc16_get_relocated_section_contents
371
372#undef  coff_bfd_relax_section
373#define coff_bfd_relax_section bfd_coff_reloc16_relax_section
374
375CREATE_BIG_COFF_TARGET_VEC (z8k_coff_vec, "coff-z8k", 0, 0, '_', NULL, COFF_SWAP_TABLE)
376