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binutils-gdb/bfd/coff-z80.c

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/* BFD back-end for Zilog Z80 COFF binaries.
Copyright (C) 2005-2021 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 3 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 "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "bfdlink.h"
#include "coff/z80.h"
#include "coff/internal.h"
#include "libcoff.h"
#include "libiberty.h"
#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0
typedef const struct {
bfd_reloc_code_real_type r_type;
reloc_howto_type howto;
} bfd_howto_type;
#define BFD_EMPTY_HOWTO(rt,x) {rt, EMPTY_HOWTO(x)}
#define BFD_HOWTO(rt,a,b,c,d,e,f,g,h,i,j,k,l,m) {rt, HOWTO(a,b,c,d,e,f,g,h,i,j,k,l,m)}
static bfd_howto_type howto_table[] =
{
BFD_EMPTY_HOWTO (BFD_RELOC_NONE, 0),
BFD_HOWTO (BFD_RELOC_32,
R_IMM32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"r_imm32", /* name */
FALSE, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
BFD_HOWTO (BFD_RELOC_24,
R_IMM24, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
24, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"r_imm24", /* name */
FALSE, /* partial_inplace */
0x00ffffff, /* src_mask */
0x00ffffff, /* dst_mask */
FALSE), /* pcrel_offset */
BFD_HOWTO (BFD_RELOC_16,
R_IMM16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"r_imm16", /* name */
FALSE, /* partial_inplace */
0x0000ffff, /* src_mask */
0x0000ffff, /* dst_mask */
FALSE), /* pcrel_offset */
BFD_HOWTO (BFD_RELOC_8,
R_IMM8, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"r_imm8", /* name */
FALSE, /* partial_inplace */
0x000000ff, /* src_mask */
0x000000ff, /* dst_mask */
FALSE), /* pcrel_offset */
BFD_HOWTO (BFD_RELOC_8_PCREL,
R_JR, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
0, /* special_function */
"r_jr", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xFF, /* dst_mask */
TRUE), /* pcrel_offset */
BFD_HOWTO (BFD_RELOC_Z80_DISP8,
R_OFF8, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
0, /* special_function */
"r_off8", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
BFD_HOWTO (BFD_RELOC_Z80_BYTE0,
R_BYTE0, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
0, /* special_function */
"r_byte0", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
BFD_HOWTO (BFD_RELOC_Z80_BYTE1,
R_BYTE1, /* type */
8, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
0, /* special_function */
"r_byte1", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
BFD_HOWTO (BFD_RELOC_Z80_BYTE2,
R_BYTE2, /* type */
16, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
0, /* special_function */
"r_byte2", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
BFD_HOWTO (BFD_RELOC_Z80_BYTE3,
R_BYTE3, /* type */
24, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
0, /* special_function */
"r_byte3", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
BFD_HOWTO (BFD_RELOC_Z80_WORD0,
R_WORD0, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
0, /* special_function */
"r_word0", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
BFD_HOWTO (BFD_RELOC_Z80_WORD1,
R_WORD1, /* type */
16, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
0, /* special_function */
"r_word1", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
BFD_HOWTO (BFD_RELOC_Z80_16_BE,
R_IMM16BE, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"r_imm16be", /* name */
FALSE, /* partial_inplace */
0x0000ffff, /* src_mask */
0x0000ffff, /* dst_mask */
FALSE), /* pcrel_offset */
};
#define NUM_HOWTOS ARRAY_SIZE (howto_table)
#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)
{
unsigned i;
for (i = 0; i < NUM_HOWTOS; i++)
{
if (howto_table[i].howto.type == dst->r_type)
{
internal->howto = &howto_table[i].howto;
return;
}
}
internal->howto = NULL;
}
#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)
{
unsigned i;
for (i = 0; i < NUM_HOWTOS; i++)
if (howto_table[i].r_type == code)
return &howto_table[i].howto;
BFD_FAIL ();
return NULL;
}
static reloc_howto_type *
coff_z80_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned i;
for (i = 0; i < NUM_HOWTOS; i++)
if (strcasecmp(howto_table[i].howto.name, r_name) == 0)
return &howto_table[i].howto;
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 = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
switch (reloc->howto->type)
{
case R_OFF8:
if (reloc->howto->partial_inplace)
val += (signed char)(bfd_get_8 ( in_abfd, data+*src_ptr)
& reloc->howto->src_mask);
if (val>127 || val<-128) /* Test for overflow. */
(*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);
bfd_put_8 (in_abfd, val, data + *dst_ptr);
(*dst_ptr) += 1;
(*src_ptr) += 1;
break;
case R_BYTE3:
bfd_put_8 (in_abfd, val >> 24, data + *dst_ptr);
(*dst_ptr) += 1;
(*src_ptr) += 1;
break;
case R_BYTE2:
bfd_put_8 (in_abfd, val >> 16, data + *dst_ptr);
(*dst_ptr) += 1;
(*src_ptr) += 1;
break;
case R_BYTE1:
bfd_put_8 (in_abfd, val >> 8, data + *dst_ptr);
(*dst_ptr) += 1;
(*src_ptr) += 1;
break;
case R_IMM8:
if (reloc->howto->partial_inplace)
val += bfd_get_8 ( in_abfd, data+*src_ptr) & reloc->howto->src_mask;
/* Fall through. */
case R_BYTE0:
bfd_put_8 (in_abfd, val, data + *dst_ptr);
(*dst_ptr) += 1;
(*src_ptr) += 1;
break;
case R_WORD1:
bfd_put_16 (in_abfd, val >> 16, data + *dst_ptr);
(*dst_ptr) += 2;
(*src_ptr) += 2;
break;
case R_IMM16:
if (reloc->howto->partial_inplace)
val += bfd_get_16 ( in_abfd, data+*src_ptr) & reloc->howto->src_mask;
/* Fall through. */
case R_WORD0:
bfd_put_16 (in_abfd, val, data + *dst_ptr);
(*dst_ptr) += 2;
(*src_ptr) += 2;
break;
case R_IMM24:
if (reloc->howto->partial_inplace)
val += (bfd_get_16 ( in_abfd, data+*src_ptr)
+ (bfd_get_8 ( in_abfd, data+*src_ptr+2) << 16))
& reloc->howto->src_mask;
bfd_put_16 (in_abfd, val, data + *dst_ptr);
bfd_put_8 (in_abfd, val >> 16, data + *dst_ptr+2);
(*dst_ptr) += 3;
(*src_ptr) += 3;
break;
case R_IMM32:
if (reloc->howto->partial_inplace)
val += bfd_get_32 ( in_abfd, data+*src_ptr) & reloc->howto->src_mask;
bfd_put_32 (in_abfd, val, data + *dst_ptr);
(*dst_ptr) += 4;
(*src_ptr) += 4;
break;
case R_JR:
{
if (reloc->howto->partial_inplace)
val += (signed char)(bfd_get_8 ( in_abfd, data+*src_ptr)
& reloc->howto->src_mask);
bfd_vma dot = (*dst_ptr
+ input_section->output_offset
+ input_section->output_section->vma);
int gap = val - dot;
if (gap >= 128 || gap < -128)
(*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);
bfd_put_8 (in_abfd, gap, data + *dst_ptr);
(*dst_ptr)++;
(*src_ptr)++;
break;
}
case R_IMM16BE:
if (reloc->howto->partial_inplace)
val += (bfd_get_8 ( in_abfd, data+*src_ptr+0) * 0x100 +
bfd_get_8 ( in_abfd, data+*src_ptr+1)) & reloc->howto->src_mask;
bfd_put_8 (in_abfd, val >> 8, data + *dst_ptr+0);
bfd_put_8 (in_abfd, val, data + *dst_ptr+1);
(*dst_ptr) += 2;
(*src_ptr) += 2;
break;
default:
abort ();
}
}
static int
z80_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED,
const char * name)
{
return (name[0] == '.' && name[1] == 'L') ||
_bfd_coff_is_local_label_name (abfd, name);
}
#define coff_bfd_is_local_label_name z80_is_local_label_name
#define coff_reloc16_extra_cases extra_case
#define coff_bfd_reloc_type_lookup coff_z80_reloc_type_lookup
#define coff_bfd_reloc_name_lookup coff_z80_reloc_name_lookup
#ifndef bfd_pe_print_pdata
#define bfd_pe_print_pdata NULL
#endif
#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 (z80_coff_vec, "coff-z80", 0,
SEC_CODE | SEC_DATA, '\0', NULL,
COFF_SWAP_TABLE)
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