1/* BFD back-end for Zilog Z80 COFF binaries.
2   Copyright 2005, 2006, 2007, 2008  Free Software Foundation, Inc.
3   Contributed by Arnold Metselaar <arnold_m@operamail.com>
4
5   This file is part of BFD, the Binary File Descriptor library.
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 3 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program; if not, write to the Free Software
19   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20   MA 02110-1301, USA.  */
21
22#include "sysdep.h"
23#include "bfd.h"
24#include "libbfd.h"
25#include "bfdlink.h"
26#include "coff/z80.h"
27#include "coff/internal.h"
28#include "libcoff.h"
29
30#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0
31
32static reloc_howto_type r_imm32 =
33HOWTO (R_IMM32, 0, 2, 32, FALSE, 0,
34       complain_overflow_dont, 0, "r_imm32", TRUE, 0xffffffff, 0xffffffff,
35       FALSE);
36
37static reloc_howto_type r_imm24 =
38HOWTO (R_IMM24, 0, 1, 24, FALSE, 0,
39       complain_overflow_dont, 0, "r_imm24", TRUE, 0x00ffffff, 0x00ffffff,
40       FALSE);
41
42static reloc_howto_type r_imm16 =
43HOWTO (R_IMM16, 0, 1, 16, FALSE, 0,
44       complain_overflow_dont, 0, "r_imm16", 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_jr =
53HOWTO (R_JR, 0, 0, 8, TRUE, 0,
54       complain_overflow_signed, 0, "r_jr", FALSE, 0, 0xFF,
55       FALSE);
56
57static reloc_howto_type r_off8 =
58HOWTO (R_OFF8, 0, 0, 8, FALSE, 0,
59       complain_overflow_signed, 0,"r_off8", FALSE, 0, 0xff,
60       FALSE);
61
62
63#define BADMAG(x) Z80BADMAG(x)
64#define Z80 1			/* Customize coffcode.h.  */
65#define __A_MAGIC_SET__
66
67/* Code to swap in the reloc.  */
68
69#define SWAP_IN_RELOC_OFFSET	H_GET_32
70#define SWAP_OUT_RELOC_OFFSET	H_PUT_32
71
72#define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
73  dst->r_stuff[0] = 'S'; \
74  dst->r_stuff[1] = 'C';
75
76/* Code to turn a r_type into a howto ptr, uses the above howto table.  */
77
78static void
79rtype2howto (arelent *internal, struct internal_reloc *dst)
80{
81  switch (dst->r_type)
82    {
83    default:
84      abort ();
85      break;
86    case R_IMM8:
87      internal->howto = &r_imm8;
88      break;
89    case R_IMM16:
90      internal->howto = &r_imm16;
91      break;
92    case R_IMM24:
93      internal->howto = &r_imm24;
94      break;
95    case R_IMM32:
96      internal->howto = &r_imm32;
97      break;
98    case R_JR:
99      internal->howto = &r_jr;
100      break;
101    case R_OFF8:
102      internal->howto = &r_off8;
103      break;
104    }
105}
106
107#define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
108
109static reloc_howto_type *
110coff_z80_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
111			    bfd_reloc_code_real_type code)
112{
113  switch (code)
114    {
115    case BFD_RELOC_8:		return & r_imm8;
116    case BFD_RELOC_16:		return & r_imm16;
117    case BFD_RELOC_24:		return & r_imm24;
118    case BFD_RELOC_32:		return & r_imm32;
119    case BFD_RELOC_8_PCREL:	return & r_jr;
120    case BFD_RELOC_Z80_DISP8:	return & r_off8;
121    default:			BFD_FAIL ();
122      return NULL;
123    }
124}
125
126static reloc_howto_type *
127coff_z80_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
128			    const char *r_name)
129{
130  if (strcasecmp (r_imm8.name, r_name) == 0)
131    return &r_imm8;
132  if (strcasecmp (r_imm16.name, r_name) == 0)
133    return &r_imm16;
134  if (strcasecmp (r_imm24.name, r_name) == 0)
135    return &r_imm24;
136  if (strcasecmp (r_imm32.name, r_name) == 0)
137    return &r_imm32;
138  if (strcasecmp (r_jr.name, r_name) == 0)
139    return &r_jr;
140  if (strcasecmp (r_off8.name, r_name) == 0)
141    return &r_off8;
142
143  return NULL;
144}
145
146/* Perform any necessary magic to the addend in a reloc entry.  */
147
148#define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
149 cache_ptr->addend =  ext_reloc.r_offset;
150
151#define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
152 reloc_processing(relent, reloc, symbols, abfd, section)
153
154static void
155reloc_processing (arelent *relent,
156                  struct internal_reloc *reloc,
157                  asymbol **symbols,
158                  bfd *abfd,
159                  asection *section)
160{
161  relent->address = reloc->r_vaddr;
162  rtype2howto (relent, reloc);
163
164  if (reloc->r_symndx > 0)
165    relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
166  else
167    relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
168
169  relent->addend = reloc->r_offset;
170  relent->address -= section->vma;
171}
172
173static void
174extra_case (bfd *in_abfd,
175            struct bfd_link_info *link_info,
176            struct bfd_link_order *link_order,
177            arelent *reloc,
178            bfd_byte *data,
179            unsigned int *src_ptr,
180            unsigned int *dst_ptr)
181{
182  asection * input_section = link_order->u.indirect.section;
183  int val;
184
185  switch (reloc->howto->type)
186    {
187    case R_OFF8:
188	val = bfd_coff_reloc16_get_value (reloc, link_info,
189					   input_section);
190	if (val>127 || val<-128) /* Test for overflow.  */
191	  {
192	    if (! ((*link_info->callbacks->reloc_overflow)
193		   (link_info, NULL,
194		    bfd_asymbol_name (*reloc->sym_ptr_ptr),
195		    reloc->howto->name, reloc->addend, input_section->owner,
196		    input_section, reloc->address)))
197	      abort ();
198	  }
199	bfd_put_8 (in_abfd, val, data + *dst_ptr);
200	(*dst_ptr) += 1;
201	(*src_ptr) += 1;
202      break;
203
204    case R_IMM8:
205      val = bfd_get_8 ( in_abfd, data+*src_ptr)
206	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
207      bfd_put_8 (in_abfd, val, data + *dst_ptr);
208      (*dst_ptr) += 1;
209      (*src_ptr) += 1;
210      break;
211
212    case R_IMM16:
213      val = bfd_get_16 ( in_abfd, data+*src_ptr)
214	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
215      bfd_put_16 (in_abfd, val, data + *dst_ptr);
216      (*dst_ptr) += 2;
217      (*src_ptr) += 2;
218      break;
219
220    case R_IMM24:
221      val = bfd_get_16 ( in_abfd, data+*src_ptr)
222	+ (bfd_get_8 ( in_abfd, data+*src_ptr+2) << 16)
223	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
224      bfd_put_16 (in_abfd, val, data + *dst_ptr);
225      bfd_put_8 (in_abfd, val >> 16, data + *dst_ptr+2);
226      (*dst_ptr) += 3;
227      (*src_ptr) += 3;
228      break;
229
230    case R_IMM32:
231      val = bfd_get_32 ( in_abfd, data+*src_ptr)
232	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
233      bfd_put_32 (in_abfd, val, data + *dst_ptr);
234      (*dst_ptr) += 4;
235      (*src_ptr) += 4;
236      break;
237
238    case R_JR:
239      {
240	bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
241						  input_section);
242	bfd_vma dot = (*dst_ptr
243		       + input_section->output_offset
244		       + input_section->output_section->vma);
245	int gap = dst - dot - 1;  /* -1, Since the offset is relative
246				     to the value of PC after reading
247				     the offset.  */
248
249	if (gap >= 128 || gap < -128)
250	  {
251	    if (! ((*link_info->callbacks->reloc_overflow)
252		   (link_info, NULL,
253		    bfd_asymbol_name (*reloc->sym_ptr_ptr),
254		    reloc->howto->name, reloc->addend, input_section->owner,
255		    input_section, reloc->address)))
256	      abort ();
257	  }
258	bfd_put_8 (in_abfd, gap, data + *dst_ptr);
259	(*dst_ptr)++;
260	(*src_ptr)++;
261	break;
262      }
263
264    default:
265      abort ();
266    }
267}
268
269#define coff_reloc16_extra_cases    extra_case
270#define coff_bfd_reloc_type_lookup  coff_z80_reloc_type_lookup
271#define coff_bfd_reloc_name_lookup coff_z80_reloc_name_lookup
272
273#ifndef bfd_pe_print_pdata
274#define bfd_pe_print_pdata	NULL
275#endif
276
277#include "coffcode.h"
278
279#undef  coff_bfd_get_relocated_section_contents
280#define coff_bfd_get_relocated_section_contents \
281  bfd_coff_reloc16_get_relocated_section_contents
282
283#undef  coff_bfd_relax_section
284#define coff_bfd_relax_section bfd_coff_reloc16_relax_section
285
286CREATE_LITTLE_COFF_TARGET_VEC (z80coff_vec, "coff-z80", 0,
287			       SEC_CODE | SEC_DATA, '\0', NULL,
288			       COFF_SWAP_TABLE)
289
290