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binutils-gdb/bfd/coff-z8k.c
Alan Modra e039f7ed86 PR28175, Segment fault in coff-tic30.c reloc_processing 
The obj_convert table shouldn't be accessed without first checking the
index against the table size.

	PR 28175
	* coff-tic30.c (reloc_processing): Sanity check reloc symbol index.
	* coff-z80.c (reloc_processing): Likewise.
	* coff-z8k.c (reloc_processing): Likewise.
2021-08-06 23:06:53 +09:30

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/* BFD back-end for Zilog Z800n COFF binaries.
Copyright (C) 1992-2021 Free Software Foundation, Inc.
Contributed by Cygnus Support.
Written by Steve Chamberlain, <sac@cygnus.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/z8k.h"
#include "coff/internal.h"
#include "libcoff.h"
#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
static reloc_howto_type r_imm32 =
HOWTO (R_IMM32, 0, 2, 32, false, 0,
complain_overflow_bitfield, 0, "r_imm32", true, 0xffffffff,
0xffffffff, false);
static reloc_howto_type r_imm4l =
HOWTO (R_IMM4L, 0, 0, 4, false, 0,
complain_overflow_bitfield, 0, "r_imm4l", true, 0xf, 0xf, false);
static reloc_howto_type r_da =
HOWTO (R_IMM16, 0, 1, 16, false, 0,
complain_overflow_bitfield, 0, "r_da", 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_rel16 =
HOWTO (R_REL16, 0, 1, 16, false, 0,
complain_overflow_bitfield, 0, "r_rel16", true, 0x0000ffff, 0x0000ffff,
true);
static reloc_howto_type r_jr =
HOWTO (R_JR, 1, 0, 8, true, 0, complain_overflow_signed, 0,
"r_jr", true, 0xff, 0xff, true);
static reloc_howto_type r_disp7 =
HOWTO (R_DISP7, 0, 0, 7, true, 0, complain_overflow_bitfield, 0,
"r_disp7", true, 0x7f, 0x7f, true);
static reloc_howto_type r_callr =
HOWTO (R_CALLR, 1, 1, 12, true, 0, complain_overflow_signed, 0,
"r_callr", true, 0xfff, 0xfff, true);
#define BADMAG(x) Z8KBADMAG(x)
#define Z8K 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:
internal->howto = NULL;
break;
case R_IMM8:
internal->howto = &r_imm8;
break;
case R_IMM16:
internal->howto = &r_da;
break;
case R_JR:
internal->howto = &r_jr;
break;
case R_DISP7:
internal->howto = &r_disp7;
break;
case R_CALLR:
internal->howto = &r_callr;
break;
case R_REL16:
internal->howto = &r_rel16;
break;
case R_IMM32:
internal->howto = &r_imm32;
break;
case R_IMM4L:
internal->howto = &r_imm4l;
break;
}
}
#define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
static reloc_howto_type *
coff_z8k_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_da;
case BFD_RELOC_32: return & r_imm32;
case BFD_RELOC_8_PCREL: return & r_jr;
case BFD_RELOC_16_PCREL: return & r_rel16;
case BFD_RELOC_Z8K_DISP7: return & r_disp7;
case BFD_RELOC_Z8K_CALLR: return & r_callr;
case BFD_RELOC_Z8K_IMM4L: return & r_imm4l;
default: BFD_FAIL ();
return 0;
}
}
static reloc_howto_type *
coff_z8k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
if (strcasecmp (r_imm8.name, r_name) == 0)
return &r_imm8;
if (strcasecmp (r_da.name, r_name) == 0)
return &r_da;
if (strcasecmp (r_imm32.name, r_name) == 0)
return &r_imm32;
if (strcasecmp (r_jr.name, r_name) == 0)
return &r_jr;
if (strcasecmp (r_rel16.name, r_name) == 0)
return &r_rel16;
if (strcasecmp (r_disp7.name, r_name) == 0)
return &r_disp7;
if (strcasecmp (r_callr.name, r_name) == 0)
return &r_callr;
if (strcasecmp (r_imm4l.name, r_name) == 0)
return &r_imm4l;
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 == -1)
relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
else if (reloc->r_symndx >= 0 && reloc->r_symndx < obj_conv_table_size (abfd))
relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
else
{
_bfd_error_handler
/* xgettext:c-format */
(_("%pB: warning: illegal symbol index %ld in relocs"),
abfd, reloc->r_symndx);
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;
switch (reloc->howto->type)
{
case R_IMM8:
bfd_put_8 (in_abfd,
bfd_coff_reloc16_get_value (reloc, link_info, input_section),
data + *dst_ptr);
(*dst_ptr) += 1;
(*src_ptr) += 1;
break;
case R_IMM32:
/* If no flags are set, assume immediate value. */
if (! (*reloc->sym_ptr_ptr)->section->flags)
{
bfd_put_32 (in_abfd,
bfd_coff_reloc16_get_value (reloc, link_info,
input_section),
data + *dst_ptr);
}
else
{
bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
input_section);
/* Addresses are 23 bit, and the layout of those in a 32-bit
value is as follows:
1AAAAAAA xxxxxxxx AAAAAAAA AAAAAAAA
(A - address bits, x - ignore). */
dst = (dst & 0xffff) | ((dst & 0xff0000) << 8) | 0x80000000;
bfd_put_32 (in_abfd, dst, data + *dst_ptr);
}
(*dst_ptr) += 4;
(*src_ptr) += 4;
break;
case R_IMM4L:
bfd_put_8 (in_abfd,
((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
| (0x0f
& bfd_coff_reloc16_get_value (reloc, link_info,
input_section))),
data + *dst_ptr);
(*dst_ptr) += 1;
(*src_ptr) += 1;
break;
case R_IMM16:
bfd_put_16 (in_abfd,
bfd_coff_reloc16_get_value (reloc, link_info, input_section),
data + *dst_ptr);
(*dst_ptr) += 2;
(*src_ptr) += 2;
break;
case R_JR:
{
bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
input_section);
bfd_vma dot = (*dst_ptr
+ input_section->output_offset
+ input_section->output_section->vma);
int gap = dst - dot - 1; /* -1, since we're in the odd byte of the
word and the pc's been incremented. */
if (gap & 1)
abort ();
gap /= 2;
if (gap > 127 || 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_DISP7:
{
bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
input_section);
bfd_vma dot = (*dst_ptr
+ input_section->output_offset
+ input_section->output_section->vma);
int gap = dst - dot - 1; /* -1, since we're in the odd byte of the
word and the pc's been incremented. */
if (gap & 1)
abort ();
gap /= 2;
if (gap > 0 || gap < -127)
(*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,
(bfd_get_8 ( in_abfd, data + *dst_ptr) & 0x80) + (-gap & 0x7f),
data + *dst_ptr);
(*dst_ptr)++;
(*src_ptr)++;
break;
}
case R_CALLR:
{
bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
input_section);
bfd_vma dot = (*dst_ptr
+ input_section->output_offset
+ input_section->output_section->vma);
int gap = dst - dot - 2;
if (gap & 1)
abort ();
if (gap > 4096 || gap < -4095)
(*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);
gap /= 2;
bfd_put_16 (in_abfd,
(bfd_get_16 ( in_abfd, data + *dst_ptr) & 0xf000) | (-gap & 0x0fff),
data + *dst_ptr);
(*dst_ptr) += 2;
(*src_ptr) += 2;
break;
}
case R_REL16:
{
bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
input_section);
bfd_vma dot = (*dst_ptr
+ input_section->output_offset
+ input_section->output_section->vma);
int gap = dst - dot - 2;
if (gap > 32767 || gap < -32768)
(*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_16 (in_abfd, (bfd_vma) gap, data + *dst_ptr);
(*dst_ptr) += 2;
(*src_ptr) += 2;
break;
}
default:
abort ();
}
}
#define coff_reloc16_extra_cases extra_case
#define coff_bfd_reloc_type_lookup coff_z8k_reloc_type_lookup
#define coff_bfd_reloc_name_lookup coff_z8k_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_BIG_COFF_TARGET_VEC (z8k_coff_vec, "coff-z8k", 0, 0, '_', NULL, COFF_SWAP_TABLE)
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