[deliverable/binutils-gdb.git] / bfd / coff-z80.c

/* BFD back-end for Zilog Z80 COFF binaries.
   Copyright 2005 Free Software Foundation, Inc.
   Contributed by Arnold Metselaar <arnold_m@operamail.com>

   This file is part of BFD, the Binary File Descriptor library.

   This program is free software; you can redistribute it and/or modify 
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "bfdlink.h"
#include "coff/z80.h"
#include "coff/internal.h"
#include "libcoff.h"

#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0

static reloc_howto_type r_imm32 =
HOWTO (R_IMM32, 0, 1, 32, FALSE, 0,
       complain_overflow_dont, 0, "r_imm32", TRUE, 0xffffffff, 0xffffffff,
       FALSE);

static reloc_howto_type r_imm16 =
HOWTO (R_IMM16, 0, 1, 16, FALSE, 0,
       complain_overflow_dont, 0, "r_imm16", TRUE, 0x0000ffff, 0x0000ffff,
       FALSE);

static reloc_howto_type r_imm8 =
HOWTO (R_IMM8, 0, 0, 8, FALSE, 0,
       complain_overflow_bitfield, 0, "r_imm8", TRUE, 0x000000ff, 0x000000ff,
       FALSE);

static reloc_howto_type r_jr =
HOWTO (R_JR, 0, 0, 8, TRUE, 0, 
       complain_overflow_signed, 0, "r_jr", FALSE, 0, 0xFF,
       FALSE);

static reloc_howto_type r_off8 =
HOWTO (R_OFF8, 0, 0, 8, FALSE, 0, 
       complain_overflow_signed, 0,"r_off8", FALSE, 0, 0xff,
       FALSE);


#define BADMAG(x) Z80BADMAG(x)
#define Z80 1			/* Customize coffcode.h.  */
#define __A_MAGIC_SET__

/* Code to swap in the reloc.  */

#define SWAP_IN_RELOC_OFFSET	H_GET_32
#define SWAP_OUT_RELOC_OFFSET	H_PUT_32

#define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  dst->r_stuff[0] = 'S'; \
  dst->r_stuff[1] = 'C';

/* Code to turn a r_type into a howto ptr, uses the above howto table.  */

static void
rtype2howto (arelent *internal, struct internal_reloc *dst)
{
  switch (dst->r_type)
    {
    default:
      abort ();
      break;
    case R_IMM8:
      internal->howto = &r_imm8;
      break;
    case R_IMM16:
      internal->howto = &r_imm16;
      break;
    case R_IMM32:
      internal->howto = &r_imm32;
      break;
    case R_JR:
      internal->howto = &r_jr;
      break;
    case R_OFF8:
      internal->howto = &r_off8;
      break;
    }
}

#define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)

static reloc_howto_type *
coff_z80_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
			    bfd_reloc_code_real_type code)
{
  switch (code)
    {
    case BFD_RELOC_8:		return & r_imm8;
    case BFD_RELOC_16:		return & r_imm16;
    case BFD_RELOC_32:		return & r_imm32;
    case BFD_RELOC_8_PCREL:	return & r_jr;
    case BFD_RELOC_Z80_DISP8:	return & r_off8;
    default:			BFD_FAIL ();
      return NULL;
    }
}

/* Perform any necessary magic to the addend in a reloc entry.  */

#define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 cache_ptr->addend =  ext_reloc.r_offset;

#define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 reloc_processing(relent, reloc, symbols, abfd, section)

static void
reloc_processing (arelent *relent,
                  struct internal_reloc *reloc,
                  asymbol **symbols,
                  bfd *abfd,
                  asection *section)
{
  relent->address = reloc->r_vaddr;
  rtype2howto (relent, reloc);

  if (reloc->r_symndx > 0)
    relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
  else
    relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;

  relent->addend = reloc->r_offset;
  relent->address -= section->vma;
}

static void
extra_case (bfd *in_abfd,
            struct bfd_link_info *link_info,
            struct bfd_link_order *link_order,
            arelent *reloc,
            bfd_byte *data,
            unsigned int *src_ptr,
            unsigned int *dst_ptr)
{
  asection * input_section = link_order->u.indirect.section;
  int val;

  switch (reloc->howto->type)
    {
    case R_OFF8:
	val = bfd_coff_reloc16_get_value (reloc, link_info,
					   input_section);
	if (val>127 || val<-128) /* Test for overflow.  */
	  {
	    if (! ((*link_info->callbacks->reloc_overflow)
		   (link_info, NULL,
		    bfd_asymbol_name (*reloc->sym_ptr_ptr),
		    reloc->howto->name, reloc->addend, input_section->owner,
		    input_section, reloc->address)))
	      abort ();
	  }
	bfd_put_8 (in_abfd, val, data + *dst_ptr);
	(*dst_ptr) += 1;
	(*src_ptr) += 1;
      break;

    case R_IMM8:
      val = bfd_get_16 ( in_abfd, data+*src_ptr)
	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
      bfd_put_8 (in_abfd, val, data + *dst_ptr);
      (*dst_ptr) += 1;
      (*src_ptr) += 1;
      break;

    case R_IMM16:
      val = bfd_get_16 ( in_abfd, data+*src_ptr)
	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
      bfd_put_16 (in_abfd, val, data + *dst_ptr);
      (*dst_ptr) += 2;
      (*src_ptr) += 2;
      break;

    case R_IMM32:
      val = bfd_get_32 ( in_abfd, data+*src_ptr)
	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
      bfd_put_32 (in_abfd, val, data + *dst_ptr);
      (*dst_ptr) += 4;
      (*src_ptr) += 4;
      break;

    case R_JR:
      {
	bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
						  input_section);
	bfd_vma dot = (link_order->offset
		       + *dst_ptr
		       + input_section->output_section->vma);
	int gap = dst - dot - 1;  /* -1, Since the offset is relative
				     to the value of PC after reading
				     the offset.  */

	if (gap >= 128 || gap < -128)
	  {
	    if (! ((*link_info->callbacks->reloc_overflow)
		   (link_info, NULL,
		    bfd_asymbol_name (*reloc->sym_ptr_ptr),
		    reloc->howto->name, reloc->addend, input_section->owner,
		    input_section, reloc->address)))
	      abort ();
	  }
	bfd_put_8 (in_abfd, gap, data + *dst_ptr);
	(*dst_ptr)++;
	(*src_ptr)++;
	break;
      }

    default:
      abort ();
    }
}

#define coff_reloc16_extra_cases    extra_case
#define coff_bfd_reloc_type_lookup  coff_z80_reloc_type_lookup

#include "coffcode.h"

#undef  coff_bfd_get_relocated_section_contents
#define coff_bfd_get_relocated_section_contents \
  bfd_coff_reloc16_get_relocated_section_contents

#undef  coff_bfd_relax_section
#define coff_bfd_relax_section bfd_coff_reloc16_relax_section

CREATE_LITTLE_COFF_TARGET_VEC (z80coff_vec, "coff-z80", 0, 0, '\0', NULL, 
			       COFF_SWAP_TABLE)
Commit	Line	Data
3c9b82ba NC	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
	32	static reloc_howto_type r_imm32 =
	33	HOWTO (R_IMM32, 0, 1, 32, FALSE, 0,
	34	complain_overflow_dont, 0, "r_imm32", TRUE, 0xffffffff, 0xffffffff,
	35	FALSE);
	36
	37	static reloc_howto_type r_imm16 =
	38	HOWTO (R_IMM16, 0, 1, 16, FALSE, 0,
	39	complain_overflow_dont, 0, "r_imm16", TRUE, 0x0000ffff, 0x0000ffff,
	40	FALSE);
	41
	42	static reloc_howto_type r_imm8 =
	43	HOWTO (R_IMM8, 0, 0, 8, FALSE, 0,
	44	complain_overflow_bitfield, 0, "r_imm8", TRUE, 0x000000ff, 0x000000ff,
	45	FALSE);
	46
	47	static reloc_howto_type r_jr =
	48	HOWTO (R_JR, 0, 0, 8, TRUE, 0,
	49	complain_overflow_signed, 0, "r_jr", FALSE, 0, 0xFF,
	50	FALSE);
	51
	52	static reloc_howto_type r_off8 =
	53	HOWTO (R_OFF8, 0, 0, 8, FALSE, 0,
	54	complain_overflow_signed, 0,"r_off8", FALSE, 0, 0xff,
	55	FALSE);
	56
	57
	58	#define BADMAG(x) Z80BADMAG(x)
	59	#define Z80 1 /* Customize coffcode.h. */
	60	#define __A_MAGIC_SET__
	61
	62	/* Code to swap in the reloc. */
	63
	64	#define SWAP_IN_RELOC_OFFSET H_GET_32
65	#define SWAP_OUT_RELOC_OFFSET H_PUT_32
66
67	#define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
68	dst->r_stuff[0] = 'S'; \
69	dst->r_stuff[1] = 'C';
70
71	/* Code to turn a r_type into a howto ptr, uses the above howto table. */
72
73	static void
74	rtype2howto (arelent internal, struct internal_reloc dst)
75	{
76	switch (dst->r_type)
77	{
78	default:
79	abort ();
80	break;
81	case R_IMM8:
82	internal->howto = &r_imm8;
83	break;
84	case R_IMM16:
85	internal->howto = &r_imm16;
86	break;
87	case R_IMM32:
88	internal->howto = &r_imm32;
89	break;
90	case R_JR:
91	internal->howto = &r_jr;
92	break;
93	case R_OFF8:
94	internal->howto = &r_off8;
95	break;
96	}
97	}
98
99	#define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
100
101	static reloc_howto_type *
102	coff_z80_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
103	bfd_reloc_code_real_type code)
104	{
105	switch (code)
106	{
107	case BFD_RELOC_8: return & r_imm8;
108	case BFD_RELOC_16: return & r_imm16;
109	case BFD_RELOC_32: return & r_imm32;
110	case BFD_RELOC_8_PCREL: return & r_jr;
111	case BFD_RELOC_Z80_DISP8: return & r_off8;
112	default: BFD_FAIL ();
113	return NULL;
114	}
115	}
116
117	/* Perform any necessary magic to the addend in a reloc entry. */
118
119	#define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
120	cache_ptr->addend = ext_reloc.r_offset;
121
122	#define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
123	reloc_processing(relent, reloc, symbols, abfd, section)
124
125	static void
126	reloc_processing (arelent *relent,
127	struct internal_reloc *reloc,
128	asymbol **symbols,
129	bfd *abfd,
130	asection *section)
131	{
132	relent->address = reloc->r_vaddr;
133	rtype2howto (relent, reloc);
134
135	if (reloc->r_symndx > 0)
136	relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
137	else
138	relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
139
140	relent->addend = reloc->r_offset;
141	relent->address -= section->vma;
142	}
143
144	static void
145	extra_case (bfd *in_abfd,
146	struct bfd_link_info *link_info,
147	struct bfd_link_order *link_order,
148	arelent *reloc,
149	bfd_byte *data,
150	unsigned int *src_ptr,
151	unsigned int *dst_ptr)
152	{
153	asection * input_section = link_order->u.indirect.section;
154	int val;
155
156	switch (reloc->howto->type)
157	{
158	case R_OFF8:
159	val = bfd_coff_reloc16_get_value (reloc, link_info,
160	input_section);
161	if (val>127 \|\| val<-128) /* Test for overflow. */
162	{
163	if (! ((*link_info->callbacks->reloc_overflow)
164	(link_info, NULL,
165	bfd_asymbol_name (*reloc->sym_ptr_ptr),
166	reloc->howto->name, reloc->addend, input_section->owner,
167	input_section, reloc->address)))
168	abort ();
169	}
170	bfd_put_8 (in_abfd, val, data + *dst_ptr);
171	(*dst_ptr) += 1;
172	(*src_ptr) += 1;
173	break;
174
175	case R_IMM8:
176	val = bfd_get_16 ( in_abfd, data+*src_ptr)
177	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
178	bfd_put_8 (in_abfd, val, data + *dst_ptr);
179	(*dst_ptr) += 1;
180	(*src_ptr) += 1;
181	break;
182
183	case R_IMM16:
184	val = bfd_get_16 ( in_abfd, data+*src_ptr)
185	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
186	bfd_put_16 (in_abfd, val, data + *dst_ptr);
187	(*dst_ptr) += 2;
188	(*src_ptr) += 2;
189	break;
190
191	case R_IMM32:
192	val = bfd_get_32 ( in_abfd, data+*src_ptr)
193	+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
194	bfd_put_32 (in_abfd, val, data + *dst_ptr);
195	(*dst_ptr) += 4;
196	(*src_ptr) += 4;
197	break;
198
199	case R_JR:
200	{
201	bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
202	input_section);
203	bfd_vma dot = (link_order->offset
204	+ *dst_ptr
205	+ input_section->output_section->vma);
206	int gap = dst - dot - 1; /* -1, Since the offset is relative
207	to the value of PC after reading
208	the offset. */
209
210	if (gap >= 128 \|\| gap < -128)
211	{
212	if (! ((*link_info->callbacks->reloc_overflow)
213	(link_info, NULL,
214	bfd_asymbol_name (*reloc->sym_ptr_ptr),
215	reloc->howto->name, reloc->addend, input_section->owner,
216	input_section, reloc->address)))
217	abort ();
218	}
219	bfd_put_8 (in_abfd, gap, data + *dst_ptr);
220	(*dst_ptr)++;
221	(*src_ptr)++;
222	break;
223	}
224
225	default:
226	abort ();
227	}
228	}
229
230	#define coff_reloc16_extra_cases extra_case
231	#define coff_bfd_reloc_type_lookup coff_z80_reloc_type_lookup
232
233	#include "coffcode.h"
234
235	#undef coff_bfd_get_relocated_section_contents
236	#define coff_bfd_get_relocated_section_contents \
237	bfd_coff_reloc16_get_relocated_section_contents
238
239	#undef coff_bfd_relax_section
240	#define coff_bfd_relax_section bfd_coff_reloc16_relax_section
241
242	CREATE_LITTLE_COFF_TARGET_VEC (z80coff_vec, "coff-z80", 0, 0, '\0', NULL,
243	COFF_SWAP_TABLE)
244