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binutils-gdb/bfd/elf32-z80.c

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/* Zilog (e)Z80-specific support for 32-bit ELF
Copyright (C) 1999-2021 Free Software Foundation, Inc.
(Heavily copied from the S12Z port by Sergey Belyashov (sergey.belyashov@gmail.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 "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/z80.h"
/* All users of this file have bfd_octets_per_byte (abfd, sec) == 1. */
#define OCTETS_PER_BYTE(ABFD, SEC) 1
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_reloc_status_type
z80_elf_16_be_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
void *data, asection *input_section, bfd *output_bfd,
char **error_message);
static const
bfd_howto_type elf_z80_howto_table[] =
{
/* This reloc does nothing. */
BFD_HOWTO (BFD_RELOC_NONE,
R_Z80_NONE, /* type */
0, /* rightshift */
3, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_NONE", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 8 bit relocation */
BFD_HOWTO (BFD_RELOC_8,
R_Z80_8, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"r_imm8", /* name */
FALSE, /* partial_inplace */
0x00, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 8 bit index register displacement relocation */
BFD_HOWTO (BFD_RELOC_Z80_DISP8,
R_Z80_8_DIS, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"r_off", /* name */
FALSE, /* partial_inplace */
0x00, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 8 bit PC-rel relocation */
BFD_HOWTO (BFD_RELOC_8_PCREL,
R_Z80_8_PCREL, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"r_jr", /* name */
FALSE, /* partial_inplace */
0x00, /* src_mask */
0xff, /* dst_mask */
TRUE), /* pcrel_offset */
/* An 16 bit absolute relocation */
BFD_HOWTO (BFD_RELOC_16,
R_Z80_16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"r_imm16", /* name */
FALSE, /* partial_inplace */
0x00000000, /* src_mask */
0x0000ffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 24 bit absolute relocation emitted by ADL mode operands */
BFD_HOWTO (BFD_RELOC_24,
R_Z80_24, /* type */
0, /* rightshift */
5, /* size (0 = byte, 1 = short, 2 = long) */
24, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"r_imm24", /* name */
FALSE, /* partial_inplace */
0x00000000, /* src_mask */
0x00ffffff, /* dst_mask */
FALSE), /* pcrel_offset */
BFD_HOWTO (BFD_RELOC_32,
R_Z80_32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"r_imm32", /* name */
FALSE, /* partial_inplace */
0x00000000, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* First (lowest) 8 bits of multibyte relocation */
BFD_HOWTO (BFD_RELOC_Z80_BYTE0,
R_Z80_BYTE0, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"r_byte0", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
/* Second 8 bits of multibyte relocation */
BFD_HOWTO (BFD_RELOC_Z80_BYTE1,
R_Z80_BYTE1, /* type */
8, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"r_byte1", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
/* Third 8 bits of multibyte relocation */
BFD_HOWTO (BFD_RELOC_Z80_BYTE2,
R_Z80_BYTE2, /* type */
16, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"r_byte2", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
/* Fourth (highest) 8 bits of multibyte relocation */
BFD_HOWTO (BFD_RELOC_Z80_BYTE3,
R_Z80_BYTE3, /* type */
24, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"r_byte3", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
/* An 16 bit absolute relocation of lower word of multibyte value */
BFD_HOWTO (BFD_RELOC_Z80_WORD0,
R_Z80_WORD0, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"r_word0", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* An 16 bit absolute relocation of higher word of multibyte value */
BFD_HOWTO (BFD_RELOC_Z80_WORD1,
R_Z80_WORD1, /* type */
16, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"r_word1", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* An 16 bit big endian absolute relocation */
BFD_HOWTO (BFD_RELOC_Z80_16_BE,
R_Z80_16_BE, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
z80_elf_16_be_reloc, /* special_function */
"r_imm16be", /* name */
FALSE, /* partial_inplace */
0x00000000, /* src_mask */
0x0000ffff, /* dst_mask */
FALSE), /* pcrel_offset */
};
static reloc_howto_type *
z80_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
enum
{
table_size = sizeof (elf_z80_howto_table) / sizeof (elf_z80_howto_table[0])
};
unsigned int i;
for (i = 0; i < table_size; i++)
{
if (elf_z80_howto_table[i].r_type == code)
return &elf_z80_howto_table[i].howto;
}
printf ("%s:%d Not found BFD reloc type %d\n", __FILE__, __LINE__, code);
return NULL;
}
static reloc_howto_type *
z80_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
{
enum
{
table_size = sizeof (elf_z80_howto_table) / sizeof (elf_z80_howto_table[0])
};
unsigned int i;
for (i = 0; i < table_size; i++)
{
if (elf_z80_howto_table[i].howto.name != NULL
&& strcasecmp (elf_z80_howto_table[i].howto.name, r_name) == 0)
return &elf_z80_howto_table[i].howto;
}
printf ("%s:%d Not found ELF reloc name `%s'\n", __FILE__, __LINE__, r_name);
return NULL;
}
static reloc_howto_type *
z80_rtype_to_howto (bfd *abfd, unsigned r_type)
{
enum
{
table_size = sizeof (elf_z80_howto_table) / sizeof (elf_z80_howto_table[0])
};
unsigned int i;
for (i = 0; i < table_size; i++)
{
if (elf_z80_howto_table[i].howto.type == r_type)
return &elf_z80_howto_table[i].howto;
}
/* xgettext:c-format */
_bfd_error_handler (_("%pB: unsupported relocation type %#x"),
abfd, r_type);
return NULL;
}
/* Set the howto pointer for an z80 ELF reloc. */
static bfd_boolean
z80_info_to_howto_rela (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst)
{
unsigned int r_type = ELF32_R_TYPE (dst->r_info);
reloc_howto_type *howto = z80_rtype_to_howto (abfd, r_type);
if (howto != NULL)
{
cache_ptr->howto = howto;
return TRUE;
}
bfd_set_error (bfd_error_bad_value);
return FALSE;
}
static bfd_reloc_status_type
z80_elf_final_link_relocate (unsigned long r_type,
bfd *input_bfd,
bfd *output_bfd ATTRIBUTE_UNUSED,
asection *input_section ATTRIBUTE_UNUSED,
bfd_byte *contents,
bfd_vma offset,
bfd_vma value,
bfd_vma addend,
struct bfd_link_info *info ATTRIBUTE_UNUSED,
asection *sym_sec ATTRIBUTE_UNUSED,
int is_local ATTRIBUTE_UNUSED)
{
bfd_boolean r;
reloc_howto_type *howto;
switch (r_type)
{
case R_Z80_16_BE:
value += addend;
bfd_put_8 (input_bfd, value >> 8, contents + offset + 0);
bfd_put_8 (input_bfd, value >> 0, contents + offset + 1);
return bfd_reloc_ok;
}
howto = z80_rtype_to_howto (input_bfd, r_type);
if (howto == NULL)
return bfd_reloc_notsupported;
r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents,
offset, value, addend);
return r ? bfd_reloc_ok : bfd_reloc_notsupported;
}
static bfd_boolean
z80_elf_relocate_section (bfd *output_bfd,
struct bfd_link_info *info,
bfd *input_bfd,
asection *input_section,
bfd_byte *contents,
Elf_Internal_Rela *relocs,
Elf_Internal_Sym *local_syms,
asection **local_sections)
{
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
Elf_Internal_Rela *rel, *relend;
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (input_bfd);
rel = relocs;
relend = relocs + input_section->reloc_count;
for (; rel < relend; rel++)
{
unsigned int r_type;
unsigned long r_symndx;
Elf_Internal_Sym *sym;
asection *sec;
struct elf_link_hash_entry *h;
bfd_vma relocation;
/* This is a final link. */
r_symndx = ELF32_R_SYM (rel->r_info);
r_type = ELF32_R_TYPE (rel->r_info);
h = NULL;
sym = NULL;
sec = NULL;
if (r_symndx < symtab_hdr->sh_info)
{
sym = local_syms + r_symndx;
sec = local_sections[r_symndx];
relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
}
else
{
bfd_boolean unresolved_reloc, warned, ignored;
RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
r_symndx, symtab_hdr, sym_hashes,
h, sec, relocation,
unresolved_reloc, warned, ignored);
}
if (sec != NULL && discarded_section (sec))
{
/* For relocs against symbols from removed linkonce sections,
or sections discarded by a linker script, we just want the
section contents cleared. Avoid any special processing. */
reloc_howto_type *howto;
howto = z80_rtype_to_howto (input_bfd, r_type);
RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
rel, 1, relend, howto, 0, contents);
}
if (bfd_link_relocatable (info))
continue;
z80_elf_final_link_relocate (r_type, input_bfd, output_bfd,
input_section,
contents, rel->r_offset,
relocation, rel->r_addend,
info, sec, h == NULL);
}
return TRUE;
}
/* The final processing done just before writing out a Z80 ELF object
file. This gets the Z80 architecture right based on the machine
number. */
static bfd_boolean
z80_elf_final_write_processing (bfd *abfd)
{
unsigned long val = bfd_get_mach (abfd);
switch (val)
{
default:
_bfd_error_handler (_("%pB: unsupported bfd mach %#lx"),
abfd, val);
/* fall through */
case bfd_mach_z80:
case bfd_mach_z80full:
case bfd_mach_z80strict:
val = EF_Z80_MACH_Z80;
break;
case bfd_mach_gbz80:
val = EF_Z80_MACH_GBZ80;
break;
case bfd_mach_z80n:
val = EF_Z80_MACH_Z80N;
break;
case bfd_mach_z180:
val = EF_Z80_MACH_Z180;
break;
case bfd_mach_ez80_z80:
val = EF_Z80_MACH_EZ80_Z80;
break;
case bfd_mach_ez80_adl:
val = EF_Z80_MACH_EZ80_ADL;
break;
case bfd_mach_r800:
val = EF_Z80_MACH_R800;
break;
}
elf_elfheader (abfd)->e_machine = EM_Z80;
elf_elfheader (abfd)->e_flags &= ~EF_Z80_MACH_MSK;
elf_elfheader (abfd)->e_flags |= val;
return _bfd_elf_final_write_processing (abfd);
}
/* Set the right machine number. */
static bfd_boolean
z80_elf_object_p (bfd *abfd)
{
unsigned int mach;
if (elf_elfheader (abfd)->e_machine == EM_Z80)
{
int e_mach = elf_elfheader (abfd)->e_flags & EF_Z80_MACH_MSK;
switch (e_mach)
{
default:
_bfd_error_handler (_("%pB: unsupported mach %#x"),
abfd, e_mach);
/* fall through */
case EF_Z80_MACH_Z80:
mach = bfd_mach_z80;
break;
case EF_Z80_MACH_GBZ80:
mach = bfd_mach_gbz80;
break;
case EF_Z80_MACH_Z180:
mach = bfd_mach_z180;
break;
case EF_Z80_MACH_EZ80_Z80:
mach = bfd_mach_ez80_z80;
break;
case EF_Z80_MACH_EZ80_ADL:
mach = bfd_mach_ez80_adl;
break;
case EF_Z80_MACH_R800:
mach = bfd_mach_r800;
break;
case EF_Z80_MACH_Z80N:
mach = bfd_mach_z80n;
break;
}
}
else
{
_bfd_error_handler (_("%pB: unsupported arch %#x"),
abfd, elf_elfheader (abfd)->e_machine);
mach = bfd_mach_z80;
}
return bfd_default_set_arch_mach (abfd, bfd_arch_z80, mach);
}
static int
z80_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED,
const char * name)
{
return (name[0] == '.' && name[1] == 'L') ||
_bfd_elf_is_local_label_name (abfd, name);
}
static bfd_reloc_status_type
z80_elf_16_be_reloc (bfd *abfd,
arelent *reloc_entry,
asymbol *symbol,
void *data,
asection *input_section,
bfd *output_bfd,
char **error_message)
{
bfd_vma val;
long x;
bfd_size_type octets = (reloc_entry->address
* OCTETS_PER_BYTE (abfd, input_section));
/* If this is a relocatable link (output_bfd test tells us), just
call the generic function. Any adjustment will be done at final
link time. */
if (output_bfd != NULL)
return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
input_section, output_bfd, error_message);
/* Get symbol value. */
val = 0;
if (!bfd_is_com_section (symbol->section))
val = symbol->value;
val += symbol->section->output_offset + input_section->output_offset;
if (symbol->section->output_section)
val += symbol->section->output_section->vma;
val += reloc_entry->addend;
if (reloc_entry->howto->partial_inplace)
{
x = bfd_get_8 (abfd, (bfd_byte *) data + octets + 0) * 0x100;
x += bfd_get_8 (abfd, (bfd_byte *) data + octets + 1);
x &= ~reloc_entry->howto->src_mask;
}
else
x = 0;
x |= val & reloc_entry->howto->dst_mask;
if (x < -0x8000 || x >= 0x10000)
return bfd_reloc_outofrange;
bfd_put_8 (abfd, x >> 8, (bfd_byte *) data + octets + 0);
bfd_put_8 (abfd, x >> 0, (bfd_byte *) data + octets + 1);
return bfd_reloc_ok;
}
#define ELF_ARCH bfd_arch_z80
#define ELF_MACHINE_CODE EM_Z80
#define ELF_MAXPAGESIZE 0x10000
#define TARGET_LITTLE_SYM z80_elf32_vec
#define TARGET_LITTLE_NAME "elf32-z80"
#define elf_backend_can_refcount 1
#define elf_backend_can_gc_sections 1
#define elf_backend_stack_align 1
#define elf_backend_rela_normal 1
#define elf_info_to_howto z80_info_to_howto_rela
#define elf_info_to_howto_rel z80_info_to_howto_rela
#define elf_backend_final_write_processing z80_elf_final_write_processing
#define elf_backend_object_p z80_elf_object_p
#define elf_backend_relocate_section z80_elf_relocate_section
#define bfd_elf32_bfd_reloc_type_lookup z80_reloc_type_lookup
#define bfd_elf32_bfd_reloc_name_lookup z80_reloc_name_lookup
#define bfd_elf32_bfd_is_local_label_name z80_is_local_label_name
#include "elf32-target.h"
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