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binutils-gdb/bfd/elf32-xc16x.c

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/* Infineon XC16X-specific support for 16-bit ELF.
Copyright (C) 2006-2017 Free Software Foundation, Inc.
Contributed by KPIT Cummins Infosystems
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, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/xc16x.h"
#include "dwarf2.h"
#include "libiberty.h"
static reloc_howto_type xc16x_elf_howto_table [] =
{
/* This reloc does nothing. */
HOWTO (R_XC16X_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_XC16X_NONE", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
/* An 8 bit absolute relocation. */
HOWTO (R_XC16X_ABS_8, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
8, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_XC16X_ABS_8", /* name */
TRUE, /* partial_inplace */
0x0000, /* src_mask */
0x00ff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 16 bit absolute relocation. */
HOWTO (R_XC16X_ABS_16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_XC16X_ABS_16", /* name */
TRUE, /* partial_inplace */
0x00000000, /* src_mask */
0x0000ffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_XC16X_ABS_32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_XC16X_ABS_32", /* name */
TRUE, /* partial_inplace */
0x00000000, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A PC relative 8 bit relocation. */
HOWTO (R_XC16X_8_PCREL, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
TRUE, /* pc_relative */
8, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_XC16X_8_PCREL", /* name */
FALSE, /* partial_inplace */
0x0000, /* src_mask */
0x00ff, /* dst_mask */
TRUE), /* pcrel_offset */
/* Relocation regarding page number. */
HOWTO (R_XC16X_PAG, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_XC16X_PAG", /* name */
TRUE, /* partial_inplace */
0x00000000, /* src_mask */
0x0000ffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* Relocation regarding page number. */
HOWTO (R_XC16X_POF, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_XC16X_POF", /* name */
TRUE, /* partial_inplace */
0x00000000, /* src_mask */
0x0000ffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* Relocation regarding segment number. */
HOWTO (R_XC16X_SEG, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_XC16X_SEG", /* name */
TRUE, /* partial_inplace */
0x00000000, /* src_mask */
0x0000ffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* Relocation regarding segment offset. */
HOWTO (R_XC16X_SOF, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_XC16X_SOF", /* name */
TRUE, /* partial_inplace */
0x00000000, /* src_mask */
0x0000ffff, /* dst_mask */
FALSE) /* pcrel_offset */
};
/* Map BFD reloc types to XC16X ELF reloc types. */
struct xc16x_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_val;
unsigned int xc16x_reloc_val;
};
static const struct xc16x_reloc_map xc16x_reloc_map [] =
{
{ BFD_RELOC_NONE, R_XC16X_NONE },
{ BFD_RELOC_8, R_XC16X_ABS_8 },
{ BFD_RELOC_16, R_XC16X_ABS_16 },
{ BFD_RELOC_32, R_XC16X_ABS_32 },
{ BFD_RELOC_8_PCREL, R_XC16X_8_PCREL },
{ BFD_RELOC_XC16X_PAG, R_XC16X_PAG},
{ BFD_RELOC_XC16X_POF, R_XC16X_POF},
{ BFD_RELOC_XC16X_SEG, R_XC16X_SEG},
{ BFD_RELOC_XC16X_SOF, R_XC16X_SOF},
};
/* This function is used to search for correct relocation type from
howto structure. */
static reloc_howto_type *
xc16x_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
unsigned int i;
for (i = ARRAY_SIZE (xc16x_reloc_map); --i;)
if (xc16x_reloc_map [i].bfd_reloc_val == code)
return & xc16x_elf_howto_table [xc16x_reloc_map[i].xc16x_reloc_val];
return NULL;
}
static reloc_howto_type *
xc16x_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned int i;
for (i = 0;
i < sizeof (xc16x_elf_howto_table) / sizeof (xc16x_elf_howto_table[0]);
i++)
if (xc16x_elf_howto_table[i].name != NULL
&& strcasecmp (xc16x_elf_howto_table[i].name, r_name) == 0)
return &xc16x_elf_howto_table[i];
return NULL;
}
/* For a particular operand this function is
called to finalise the type of relocation. */
static void
elf32_xc16x_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc,
Elf_Internal_Rela *elf_reloc)
{
unsigned int r;
unsigned int i;
r = ELF32_R_TYPE (elf_reloc->r_info);
for (i = 0; i < ARRAY_SIZE (xc16x_elf_howto_table); i++)
if (xc16x_elf_howto_table[i].type == r)
{
bfd_reloc->howto = &xc16x_elf_howto_table[i];
return;
}
abort ();
}
static bfd_reloc_status_type
elf32_xc16x_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_byte *hit_data = contents + offset;
bfd_vma val1;
switch (r_type)
{
case R_XC16X_NONE:
return bfd_reloc_ok;
case R_XC16X_ABS_16:
value += addend;
bfd_put_16 (input_bfd, value, hit_data);
return bfd_reloc_ok;
case R_XC16X_8_PCREL:
bfd_put_8 (input_bfd, value, hit_data);
return bfd_reloc_ok;
/* Following case is to find page number from actual
address for this divide value by 16k i.e. page size. */
case R_XC16X_PAG:
value += addend;
value /= 0x4000;
bfd_put_16 (input_bfd, value, hit_data);
return bfd_reloc_ok;
/* Following case is to find page offset from actual address
for this take modulo of value by 16k i.e. page size. */
case R_XC16X_POF:
value += addend;
value %= 0x4000;
bfd_put_16 (input_bfd, value, hit_data);
return bfd_reloc_ok;
/* Following case is to find segment number from actual
address for this divide value by 64k i.e. segment size. */
case R_XC16X_SEG:
value += addend;
value /= 0x10000;
bfd_put_16 (input_bfd, value, hit_data);
return bfd_reloc_ok;
/* Following case is to find segment offset from actual address
for this take modulo of value by 64k i.e. segment size. */
case R_XC16X_SOF:
value += addend;
value %= 0x10000;
bfd_put_16 (input_bfd, value, hit_data);
return bfd_reloc_ok;
case R_XC16X_ABS_32:
if (!strstr (input_section->name,".debug"))
{
value += addend;
val1 = value;
value %= 0x4000;
val1 /= 0x4000;
val1 = val1 << 16;
value += val1;
bfd_put_32 (input_bfd, value, hit_data);
}
else
{
value += addend;
bfd_put_32 (input_bfd, value, hit_data);
}
return bfd_reloc_ok;
default:
return bfd_reloc_notsupported;
}
}
static bfd_boolean
elf32_xc16x_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 = xc16x_reloc_type_lookup (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;
elf32_xc16x_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;
}
static void
elf32_xc16x_final_write_processing (bfd *abfd,
bfd_boolean linker ATTRIBUTE_UNUSED)
{
unsigned long val;
switch (bfd_get_mach (abfd))
{
default:
case bfd_mach_xc16x:
val = 0x1000;
break;
case bfd_mach_xc16xl:
val = 0x1001;
break;
case bfd_mach_xc16xs:
val = 0x1002;
break;
}
elf_elfheader (abfd)->e_flags |= val;
}
static unsigned long
elf32_xc16x_mach (flagword flags)
{
switch (flags)
{
case 0x1000:
default:
return bfd_mach_xc16x;
case 0x1001:
return bfd_mach_xc16xl;
case 0x1002:
return bfd_mach_xc16xs;
}
}
static bfd_boolean
elf32_xc16x_object_p (bfd *abfd)
{
bfd_default_set_arch_mach (abfd, bfd_arch_xc16x,
elf32_xc16x_mach (elf_elfheader (abfd)->e_flags));
return TRUE;
}
#define ELF_ARCH bfd_arch_xc16x
#define ELF_MACHINE_CODE EM_XC16X
#define ELF_MAXPAGESIZE 0x100
#define TARGET_LITTLE_SYM xc16x_elf32_vec
#define TARGET_LITTLE_NAME "elf32-xc16x"
#define elf_backend_final_write_processing elf32_xc16x_final_write_processing
#define elf_backend_object_p elf32_xc16x_object_p
#define elf_backend_can_gc_sections 1
#define bfd_elf32_bfd_reloc_type_lookup xc16x_reloc_type_lookup
#define bfd_elf32_bfd_reloc_name_lookup xc16x_reloc_name_lookup
#define elf_info_to_howto elf32_xc16x_info_to_howto
#define elf_info_to_howto_rel elf32_xc16x_info_to_howto
#define elf_backend_relocate_section elf32_xc16x_relocate_section
#define elf_backend_rela_normal 1
#include "elf32-target.h"
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