1/* BFD back-end for Zilog Z80 COFF binaries.
2   Copyright 2005 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 2 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 "bfd.h"
23#include "sysdep.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, 1, 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
126/* Perform any necessary magic to the addend in a reloc entry.  */
127
128#define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
129 cache_ptr->addend =  ext_reloc.r_offset;
130
131#define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
132 reloc_processing(relent, reloc, symbols, abfd, section)
133
134static void
135reloc_processing (arelent *relent,
136                  struct internal_reloc *reloc,
137                  asymbol **symbols,
138                  bfd *abfd,
139                  asection *section)
140{
141  relent->address = reloc->r_vaddr;
142  rtype2howto (relent, reloc);
143
144  if (reloc->r_symndx > 0)
145    relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
146  else
147    relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
148
149  relent->addend = reloc->r_offset;
150  relent->address -= section->vma;
151}
152
153static void
154extra_case (bfd *in_abfd,
155            struct bfd_link_info *link_info,
156            struct bfd_link_order *link_order,
157            arelent *reloc,
158            bfd_byte *data,
159            unsigned int *src_ptr,
160            unsigned int *dst_ptr)
161{
162  asection * input_section = link_order->u.indirect.section;
163  int val;
164
165  switch (reloc->howto->type)
166    {
167    case R_OFF8:
168	val = bfd_coff_reloc16_get_value (reloc, link_info,
169					   input_section);
170	if (val>127 || val<-128) /* Test for overflow.  */
171	  {
172	    if (! ((*link_info->callbacks->reloc_overflow)
173		   (link_info, NULL,
174		    bfd_asymbol_name (*reloc->sym_ptr_ptr),
175		    reloc->howto->name, reloc->addend, input_section->owner,
176		    input_section, reloc->address)))
177	      abort ();
178	  }
179	bfd_put_8 (in_abfd, val, data + *dst_ptr);
180	(*dst_ptr) += 1;
181	(*src_ptr) += 1;
182      break;
183
184    case R_IMM8:
185      val = bfd_get_8 ( in_abfd, data+*src_ptr)
186	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
187      bfd_put_8 (in_abfd, val, data + *dst_ptr);
188      (*dst_ptr) += 1;
189      (*src_ptr) += 1;
190      break;
191
192    case R_IMM16:
193      val = bfd_get_16 ( in_abfd, data+*src_ptr)
194	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
195      bfd_put_16 (in_abfd, val, data + *dst_ptr);
196      (*dst_ptr) += 2;
197      (*src_ptr) += 2;
198      break;
199
200    case R_IMM24:
201      val = bfd_get_16 ( in_abfd, data+*src_ptr)
202	+ (bfd_get_8 ( in_abfd, data+*src_ptr+2) << 16)
203	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
204      bfd_put_16 (in_abfd, val, data + *dst_ptr);
205      bfd_put_8 (in_abfd, val >> 16, data + *dst_ptr+2);
206      (*dst_ptr) += 3;
207      (*src_ptr) += 3;
208      break;
209
210    case R_IMM32:
211      val = bfd_get_32 ( in_abfd, data+*src_ptr)
212	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
213      bfd_put_32 (in_abfd, val, data + *dst_ptr);
214      (*dst_ptr) += 4;
215      (*src_ptr) += 4;
216      break;
217
218    case R_JR:
219      {
220	bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
221						  input_section);
222	bfd_vma dot = (*dst_ptr
223		       + input_section->output_offset
224		       + input_section->output_section->vma);
225	int gap = dst - dot - 1;  /* -1, Since the offset is relative
226				     to the value of PC after reading
227				     the offset.  */
228
229	if (gap >= 128 || gap < -128)
230	  {
231	    if (! ((*link_info->callbacks->reloc_overflow)
232		   (link_info, NULL,
233		    bfd_asymbol_name (*reloc->sym_ptr_ptr),
234		    reloc->howto->name, reloc->addend, input_section->owner,
235		    input_section, reloc->address)))
236	      abort ();
237	  }
238	bfd_put_8 (in_abfd, gap, data + *dst_ptr);
239	(*dst_ptr)++;
240	(*src_ptr)++;
241	break;
242      }
243
244    default:
245      abort ();
246    }
247}
248
249#define coff_reloc16_extra_cases    extra_case
250#define coff_bfd_reloc_type_lookup  coff_z80_reloc_type_lookup
251
252#include "coffcode.h"
253
254#undef  coff_bfd_get_relocated_section_contents
255#define coff_bfd_get_relocated_section_contents \
256  bfd_coff_reloc16_get_relocated_section_contents
257
258#undef  coff_bfd_relax_section
259#define coff_bfd_relax_section bfd_coff_reloc16_relax_section
260
261CREATE_LITTLE_COFF_TARGET_VEC (z80coff_vec, "coff-z80", 0, 0, '\0', NULL,
262			       COFF_SWAP_TABLE)
263
264